[core] Convert style properties to a tuple-based approach

This converts the style property classes (CirclePaintProperties and so on) to the same tuple-based approach as gl::Attribute and gl::Uniform. The approach is outlined in https://github.com/mapbox/cpp/blob/master/C%2B%2B%20Structural%20Metaprogramming.md.

The main advantage of this approach is it allows writing algorithms that work on sets of style properties, without resorting to code generation or manually repetitive code. This lets us iterate on approaches to data-driven properties more easily.

Another advantage is that the cascading, unevaluated, and evaluated states of a set of properties exist as independent structures, instead of individual properties holding their own state. This is a more functional approach that makes data flow clearer and reduces state.

cmake/core-files.cmake

@@ -236,7 +236,6 @@ set(MBGL_CORE_FILES
     include/mbgl/style/types.hpp
     src/mbgl/style/bucket_parameters.cpp
     src/mbgl/style/bucket_parameters.hpp
-    src/mbgl/style/calculation_parameters.hpp
     src/mbgl/style/cascade_parameters.hpp
     src/mbgl/style/class_dictionary.cpp
     src/mbgl/style/class_dictionary.hpp
@@ -249,6 +248,7 @@ set(MBGL_CORE_FILES
     src/mbgl/style/paint_property.hpp
     src/mbgl/style/parser.cpp
     src/mbgl/style/parser.hpp
+    src/mbgl/style/property_evaluation_parameters.hpp
     src/mbgl/style/property_evaluator.cpp
     src/mbgl/style/property_evaluator.hpp
     src/mbgl/style/property_parsing.cpp
@@ -442,8 +442,10 @@ set(MBGL_CORE_FILES
     src/mbgl/util/http_header.hpp
     src/mbgl/util/http_timeout.cpp
     src/mbgl/util/http_timeout.hpp
+    src/mbgl/util/ignore.hpp
     src/mbgl/util/i18n.cpp
     src/mbgl/util/i18n.hpp
+    src/mbgl/util/indexed_tuple.hpp
     src/mbgl/util/interpolate.hpp
     src/mbgl/util/intersection_tests.cpp
     src/mbgl/util/intersection_tests.hpp

include/mbgl/style/property_value.hpp

@@ -33,9 +33,9 @@ public:
 
     explicit operator bool() const { return !isUndefined(); };
 
-    template <typename Visitor>
-    static auto visit(const PropertyValue<T>& value, Visitor&& visitor) {
-        return Value::visit(value.value, visitor);
+    template <typename Evaluator>
+    auto evaluate(const Evaluator& evaluator) const {
+        return Value::visit(value, evaluator);
     }
 };
 

include/mbgl/style/transition_options.hpp

@@ -6,9 +6,21 @@
 namespace mbgl {
 namespace style {
 
-struct TransitionOptions {
+class TransitionOptions {
+public:
     optional<Duration> duration = {};
     optional<Duration> delay = {};
+
+    TransitionOptions reverseMerge(const TransitionOptions& defaults) const {
+        return {
+            duration ? duration : defaults.duration,
+            delay ? delay : defaults.delay
+        };
+    }
+
+    explicit operator bool() const {
+        return duration || delay;
+    }
 };
 
 } // namespace style

src/mbgl/layout/symbol_instance.cpp

@@ -7,7 +7,7 @@ using namespace style;
 
 SymbolInstance::SymbolInstance(Anchor& anchor, const GeometryCoordinates& line,
         const Shaping& shapedText, const PositionedIcon& shapedIcon,
-        const SymbolLayoutProperties& layout, const bool addToBuffers, const uint32_t index_,
+        const SymbolLayoutProperties::Evaluated& layout, const bool addToBuffers, const uint32_t index_,
         const float textBoxScale, const float textPadding, const SymbolPlacementType textPlacement,
         const float iconBoxScale, const float iconPadding, const SymbolPlacementType iconPlacement,
         const GlyphPositions& face, const IndexedSubfeature& indexedFeature) :

src/mbgl/layout/symbol_instance.hpp

@@ -2,21 +2,18 @@
 
 #include <mbgl/text/quads.hpp>
 #include <mbgl/text/collision_feature.hpp>
+#include <mbgl/style/layers/symbol_layer_properties.hpp>
 
 namespace mbgl {
 
 struct Anchor;
 class IndexedSubfeature;
 
-namespace style {
-class SymbolLayoutProperties;
-} // namespace style
-
 class SymbolInstance {
 public:
     explicit SymbolInstance(Anchor& anchor, const GeometryCoordinates& line,
             const Shaping& shapedText, const PositionedIcon& shapedIcon,
-            const style::SymbolLayoutProperties&, const bool inside, const uint32_t index,
+            const style::SymbolLayoutProperties::Evaluated&, const bool inside, const uint32_t index,
             const float textBoxScale, const float textPadding, style::SymbolPlacementType textPlacement,
             const float iconBoxScale, const float iconPadding, style::SymbolPlacementType iconPlacement,
             const GlyphPositions& face, const IndexedSubfeature& indexedfeature);

src/mbgl/layout/symbol_layout.cpp

@@ -33,7 +33,7 @@ SymbolLayout::SymbolLayout(std::string bucketName_,
                            const MapMode mode_,
                            const GeometryTileLayer& layer,
                            const style::Filter& filter,
-                           style::SymbolLayoutProperties layout_,
+                           style::SymbolLayoutProperties::Evaluated layout_,
                            float textMaxSize_,
                            SpriteAtlas& spriteAtlas_)
     : bucketName(std::move(bucketName_)),
@@ -47,8 +47,8 @@ SymbolLayout::SymbolLayout(std::string bucketName_,
       tileSize(util::tileSize * overscaling_),
       tilePixelRatio(float(util::EXTENT) / tileSize) {
 
-    const bool hasText = !layout.textField.value.empty() && !layout.textFont.value.empty();
-    const bool hasIcon = !layout.iconImage.value.empty();
+    const bool hasText = !layout.get<TextField>().empty() && !layout.get<TextFont>().empty();
+    const bool hasIcon = !layout.get<IconImage>().empty();
 
     if (!hasText && !hasIcon) {
         return;
@@ -84,11 +84,11 @@ SymbolLayout::SymbolLayout(std::string bucketName_,
         };
 
         if (hasText) {
-            std::string u8string = util::replaceTokens(layout.textField, getValue);
+            std::string u8string = util::replaceTokens(layout.get<TextField>(), getValue);
 
-            if (layout.textTransform == TextTransformType::Uppercase) {
+            if (layout.get<TextTransform>() == TextTransformType::Uppercase) {
                 u8string = platform::uppercase(u8string);
-            } else if (layout.textTransform == TextTransformType::Lowercase) {
+            } else if (layout.get<TextTransform>() == TextTransformType::Lowercase) {
                 u8string = platform::lowercase(u8string);
             }
 
@@ -103,7 +103,7 @@ SymbolLayout::SymbolLayout(std::string bucketName_,
         }
 
         if (hasIcon) {
-            ft.icon = util::replaceTokens(layout.iconImage, getValue);
+            ft.icon = util::replaceTokens(layout.get<IconImage>(), getValue);
         }
 
         if (ft.text || ft.icon) {
@@ -121,7 +121,7 @@ SymbolLayout::SymbolLayout(std::string bucketName_,
         }
     }
 
-    if (layout.symbolPlacement == SymbolPlacementType::Line) {
+    if (layout.get<SymbolPlacement>() == SymbolPlacementType::Line) {
         util::mergeLines(features);
     }
 }
@@ -131,11 +131,11 @@ bool SymbolLayout::hasSymbolInstances() const {
 }
 
 bool SymbolLayout::canPrepare(GlyphAtlas& glyphAtlas) {
-    if (!layout.textField.value.empty() && !layout.textFont.value.empty() && !glyphAtlas.hasGlyphRanges(layout.textFont, ranges)) {
+    if (!layout.get<TextField>().empty() && !layout.get<TextFont>().empty() && !glyphAtlas.hasGlyphRanges(layout.get<TextFont>(), ranges)) {
         return false;
     }
 
-    if (!layout.iconImage.value.empty() && !spriteAtlas.isLoaded()) {
+    if (!layout.get<IconImage>().empty() && !spriteAtlas.isLoaded()) {
         return false;
     }
 
@@ -147,7 +147,7 @@ void SymbolLayout::prepare(uintptr_t tileUID,
     float horizontalAlign = 0.5;
     float verticalAlign = 0.5;
 
-    switch (layout.textAnchor) {
+    switch (layout.get<TextAnchor>()) {
         case TextAnchorType::Top:
         case TextAnchorType::Bottom:
         case TextAnchorType::Center:
@@ -164,7 +164,7 @@ void SymbolLayout::prepare(uintptr_t tileUID,
             break;
     }
 
-    switch (layout.textAnchor) {
+    switch (layout.get<TextAnchor>()) {
         case TextAnchorType::Left:
         case TextAnchorType::Right:
         case TextAnchorType::Center:
@@ -181,11 +181,11 @@ void SymbolLayout::prepare(uintptr_t tileUID,
             break;
     }
 
-    const float justify = layout.textJustify == TextJustifyType::Right ? 1 :
-        layout.textJustify == TextJustifyType::Left ? 0 :
+    const float justify = layout.get<TextJustify>() == TextJustifyType::Right ? 1 :
+        layout.get<TextJustify>() == TextJustifyType::Left ? 0 :
         0.5;
 
-    auto glyphSet = glyphAtlas.getGlyphSet(layout.textFont);
+    auto glyphSet = glyphAtlas.getGlyphSet(layout.get<TextFont>());
 
     for (const auto& feature : features) {
         if (feature.geometry.empty()) continue;
@@ -199,18 +199,18 @@ void SymbolLayout::prepare(uintptr_t tileUID,
             shapedText = glyphSet->getShaping(
                 /* string */ *feature.text,
                 /* base direction of text */ *feature.writingDirection,
-                /* maxWidth: ems */ layout.symbolPlacement != SymbolPlacementType::Line ?
-                    layout.textMaxWidth * 24 : 0,
-                /* lineHeight: ems */ layout.textLineHeight * 24,
+                /* maxWidth: ems */ layout.get<SymbolPlacement>() != SymbolPlacementType::Line ?
+                    layout.get<TextMaxWidth>() * 24 : 0,
+                /* lineHeight: ems */ layout.get<TextLineHeight>() * 24,
                 /* horizontalAlign */ horizontalAlign,
                 /* verticalAlign */ verticalAlign,
                 /* justify */ justify,
-                /* spacing: ems */ layout.textLetterSpacing * 24,
-                /* translate */ Point<float>(layout.textOffset.value[0], layout.textOffset.value[1]));
+                /* spacing: ems */ layout.get<TextLetterSpacing>() * 24,
+                /* translate */ Point<float>(layout.get<TextOffset>()[0], layout.get<TextOffset>()[1]));
 
             // Add the glyphs we need for this label to the glyph atlas.
             if (shapedText) {
-                glyphAtlas.addGlyphs(tileUID, *feature.text, layout.textFont, **glyphSet, face);
+                glyphAtlas.addGlyphs(tileUID, *feature.text, layout.get<TextFont>(), **glyphSet, face);
             }
         }
 
@@ -225,7 +225,7 @@ void SymbolLayout::prepare(uintptr_t tileUID,
                 }
                 if ((*image).relativePixelRatio != 1.0f) {
                     iconsNeedLinear = true;
-                } else if (layout.iconRotate != 0) {
+                } else if (layout.get<IconRotate>() != 0) {
                     iconsNeedLinear = true;
                 }
             }
@@ -247,24 +247,24 @@ void SymbolLayout::addFeature(const GeometryCollection &lines,
     const float minScale = 0.5f;
     const float glyphSize = 24.0f;
 
-    const float fontScale = layout.textSize / glyphSize;
+    const float fontScale = layout.get<TextSize>() / glyphSize;
     const float textBoxScale = tilePixelRatio * fontScale;
     const float textMaxBoxScale = tilePixelRatio * textMaxSize / glyphSize;
-    const float iconBoxScale = tilePixelRatio * layout.iconSize;
-    const float symbolSpacing = tilePixelRatio * layout.symbolSpacing;
-    const bool avoidEdges = layout.symbolAvoidEdges && layout.symbolPlacement != SymbolPlacementType::Line;
-    const float textPadding = layout.textPadding * tilePixelRatio;
-    const float iconPadding = layout.iconPadding * tilePixelRatio;
-    const float textMaxAngle = layout.textMaxAngle * util::DEG2RAD;
-    const SymbolPlacementType textPlacement = layout.textRotationAlignment != AlignmentType::Map
+    const float iconBoxScale = tilePixelRatio * layout.get<IconSize>();
+    const float symbolSpacing = tilePixelRatio * layout.get<SymbolSpacing>();
+    const bool avoidEdges = layout.get<SymbolAvoidEdges>() && layout.get<SymbolPlacement>() != SymbolPlacementType::Line;
+    const float textPadding = layout.get<TextPadding>() * tilePixelRatio;
+    const float iconPadding = layout.get<IconPadding>() * tilePixelRatio;
+    const float textMaxAngle = layout.get<TextMaxAngle>() * util::DEG2RAD;
+    const SymbolPlacementType textPlacement = layout.get<TextRotationAlignment>() != AlignmentType::Map
                                                   ? SymbolPlacementType::Point
-                                                  : layout.symbolPlacement;
-    const SymbolPlacementType iconPlacement = layout.iconRotationAlignment != AlignmentType::Map
+                                                  : layout.get<SymbolPlacement>();
+    const SymbolPlacementType iconPlacement = layout.get<IconRotationAlignment>() != AlignmentType::Map
                                                   ? SymbolPlacementType::Point
-                                                  : layout.symbolPlacement;
-    const bool mayOverlap = layout.textAllowOverlap || layout.iconAllowOverlap ||
-        layout.textIgnorePlacement || layout.iconIgnorePlacement;
-    const bool isLine = layout.symbolPlacement == SymbolPlacementType::Line;
+                                                  : layout.get<SymbolPlacement>();
+    const bool mayOverlap = layout.get<TextAllowOverlap>() || layout.get<IconAllowOverlap>() ||
+        layout.get<TextIgnorePlacement>() || layout.get<IconIgnorePlacement>();
+    const bool isLine = layout.get<SymbolPlacement>() == SymbolPlacementType::Line;
     const float textRepeatDistance = symbolSpacing / 2;
 
     auto& clippedLines = isLine ?
@@ -335,15 +335,15 @@ std::unique_ptr<SymbolBucket> SymbolLayout::place(CollisionTile& collisionTile)
     // Calculate which labels can be shown and when they can be shown and
     // create the bufers used for rendering.
 
-    const SymbolPlacementType textPlacement = layout.textRotationAlignment != AlignmentType::Map
+    const SymbolPlacementType textPlacement = layout.get<TextRotationAlignment>() != AlignmentType::Map
                                                   ? SymbolPlacementType::Point
-                                                  : layout.symbolPlacement;
-    const SymbolPlacementType iconPlacement = layout.iconRotationAlignment != AlignmentType::Map
+                                                  : layout.get<SymbolPlacement>();
+    const SymbolPlacementType iconPlacement = layout.get<IconRotationAlignment>() != AlignmentType::Map
                                                   ? SymbolPlacementType::Point
-                                                  : layout.symbolPlacement;
+                                                  : layout.get<SymbolPlacement>();
 
-    const bool mayOverlap = layout.textAllowOverlap || layout.iconAllowOverlap ||
-        layout.textIgnorePlacement || layout.iconIgnorePlacement;
+    const bool mayOverlap = layout.get<TextAllowOverlap>() || layout.get<IconAllowOverlap>() ||
+        layout.get<TextIgnorePlacement>() || layout.get<IconIgnorePlacement>();
 
     // Sort symbols by their y position on the canvas so that they lower symbols
     // are drawn on top of higher symbols.
@@ -367,18 +367,18 @@ std::unique_ptr<SymbolBucket> SymbolLayout::place(CollisionTile& collisionTile)
         const bool hasText = symbolInstance.hasText;
         const bool hasIcon = symbolInstance.hasIcon;
 
-        const bool iconWithoutText = layout.textOptional || !hasText;
-        const bool textWithoutIcon = layout.iconOptional || !hasIcon;
+        const bool iconWithoutText = layout.get<TextOptional>() || !hasText;
+        const bool textWithoutIcon = layout.get<IconOptional>() || !hasIcon;
 
         // Calculate the scales at which the text and icon can be placed without collision.
 
         float glyphScale = hasText ?
             collisionTile.placeFeature(symbolInstance.textCollisionFeature,
-                    layout.textAllowOverlap, layout.symbolAvoidEdges) :
+                    layout.get<TextAllowOverlap>(), layout.get<SymbolAvoidEdges>()) :
             collisionTile.minScale;
         float iconScale = hasIcon ?
             collisionTile.placeFeature(symbolInstance.iconCollisionFeature,
-                    layout.iconAllowOverlap, layout.symbolAvoidEdges) :
+                    layout.get<IconAllowOverlap>(), layout.get<SymbolAvoidEdges>()) :
             collisionTile.minScale;
 
 
@@ -396,20 +396,20 @@ std::unique_ptr<SymbolBucket> SymbolLayout::place(CollisionTile& collisionTile)
         // Insert final placement into collision tree and add glyphs/icons to buffers
 
         if (hasText) {
-            collisionTile.insertFeature(symbolInstance.textCollisionFeature, glyphScale, layout.textIgnorePlacement);
+            collisionTile.insertFeature(symbolInstance.textCollisionFeature, glyphScale, layout.get<TextIgnorePlacement>());
             if (glyphScale < collisionTile.maxScale) {
                 addSymbols(
                     bucket->text, symbolInstance.glyphQuads, glyphScale,
-                    layout.textKeepUpright, textPlacement, collisionTile.config.angle);
+                    layout.get<TextKeepUpright>(), textPlacement, collisionTile.config.angle);
             }
         }
 
         if (hasIcon) {
-            collisionTile.insertFeature(symbolInstance.iconCollisionFeature, iconScale, layout.iconIgnorePlacement);
+            collisionTile.insertFeature(symbolInstance.iconCollisionFeature, iconScale, layout.get<IconIgnorePlacement>());
             if (iconScale < collisionTile.maxScale) {
                 addSymbols(
                     bucket->icon, symbolInstance.iconQuads, iconScale,
-                    layout.iconKeepUpright, iconPlacement, collisionTile.config.angle);
+                    layout.get<IconKeepUpright>(), iconPlacement, collisionTile.config.angle);
             }
         }
     }

src/mbgl/layout/symbol_layout.hpp

@@ -34,7 +34,7 @@ public:
                  const MapMode,
                  const GeometryTileLayer&,
                  const style::Filter&,
-                 style::SymbolLayoutProperties,
+                 style::SymbolLayoutProperties::Evaluated,
                  float textMaxSize,
                  SpriteAtlas&);
 
@@ -78,7 +78,7 @@ private:
     const float overscaling;
     const float zoom;
     const MapMode mode;
-    const style::SymbolLayoutProperties layout;
+    const style::SymbolLayoutProperties::Evaluated layout;
     const float textMaxSize;
 
     SpriteAtlas& spriteAtlas;

src/mbgl/programs/line_program.cpp

@@ -8,10 +8,12 @@
 
 namespace mbgl {
 
+using namespace style;
+
 static_assert(sizeof(LineAttributes::Vertex) == 8, "expected LineVertex size");
 
 template <class Values, class...Args>
-Values makeValues(const style::LinePaintProperties& properties,
+Values makeValues(const LinePaintProperties::Evaluated& properties,
                   const RenderTile& tile,
                   const TransformState& state,
                   Args&&... args) {
@@ -27,14 +29,16 @@ Values makeValues(const style::LinePaintProperties& properties,
     float x = state.getSize().height / 2.0f * std::tan(state.getPitch());
 
     return Values {
-        uniforms::u_matrix::Value{ tile.translatedMatrix(properties.lineTranslate.value,
-                                   properties.lineTranslateAnchor.value,
-                                   state) },
-        uniforms::u_opacity::Value{ properties.lineOpacity.value },
-        uniforms::u_width::Value{ properties.lineWidth.value },
-        uniforms::u_gapwidth::Value{ properties.lineGapWidth.value },
-        uniforms::u_blur::Value{ properties.lineBlur.value },
-        uniforms::u_offset::Value{ properties.lineOffset.value },
+        uniforms::u_matrix::Value{
+            tile.translatedMatrix(properties.get<LineTranslate>(),
+                                  properties.get<LineTranslateAnchor>(),
+                                  state)
+        },
+        uniforms::u_opacity::Value{ properties.get<LineOpacity>() },
+        uniforms::u_width::Value{ properties.get<LineWidth>() },
+        uniforms::u_gapwidth::Value{ properties.get<LineGapWidth>() },
+        uniforms::u_blur::Value{ properties.get<LineBlur>() },
+        uniforms::u_offset::Value{ properties.get<LineOffset>() },
         uniforms::u_antialiasingmatrix::Value{ antialiasingMatrix },
         uniforms::u_ratio::Value{ 1.0f / tile.id.pixelsToTileUnits(1.0, state.getZoom()) },
         uniforms::u_extra::Value{ (topedgelength + x) / topedgelength - 1.0f },
@@ -43,19 +47,19 @@ Values makeValues(const style::LinePaintProperties& properties,
 }
 
 LineProgram::UniformValues
-LineProgram::uniformValues(const style::LinePaintProperties& properties,
+LineProgram::uniformValues(const LinePaintProperties::Evaluated& properties,
                            const RenderTile& tile,
                            const TransformState& state) {
     return makeValues<LineProgram::UniformValues>(
         properties,
         tile,
         state,
-        uniforms::u_color::Value{ properties.lineColor.value }
+        uniforms::u_color::Value{ properties.get<LineColor>() }
     );
 }
 
 LineSDFProgram::UniformValues
-LineSDFProgram::uniformValues(const style::LinePaintProperties& properties,
+LineSDFProgram::uniformValues(const LinePaintProperties::Evaluated& properties,
                               float pixelRatio,
                               const RenderTile& tile,
                               const TransformState& state,
@@ -63,8 +67,8 @@ LineSDFProgram::uniformValues(const style::LinePaintProperties& properties,
                               const LinePatternPos& posB,
                               float dashLineWidth,
                               float atlasWidth) {
-    const float widthA = posA.width * properties.lineDasharray.value.fromScale * dashLineWidth;
-    const float widthB = posB.width * properties.lineDasharray.value.toScale * dashLineWidth;
+    const float widthA = posA.width * properties.get<LineDasharray>().fromScale * dashLineWidth;
+    const float widthB = posB.width * properties.get<LineDasharray>().toScale * dashLineWidth;
 
     std::array<float, 2> scaleA {{
         1.0f / tile.id.pixelsToTileUnits(widthA, state.getIntegerZoom()),
@@ -80,30 +84,30 @@ LineSDFProgram::uniformValues(const style::LinePaintProperties& properties,
         properties,
         tile,
         state,
-        uniforms::u_color::Value{ properties.lineColor.value },
+        uniforms::u_color::Value{ properties.get<LineColor>() },
         uniforms::u_patternscale_a::Value{ scaleA },
         uniforms::u_patternscale_b::Value{ scaleB },
         uniforms::u_tex_y_a::Value{ posA.y },
         uniforms::u_tex_y_b::Value{ posB.y },
-        uniforms::u_mix::Value{ properties.lineDasharray.value.t },
+        uniforms::u_mix::Value{ properties.get<LineDasharray>().t },
         uniforms::u_sdfgamma::Value{ atlasWidth / (std::min(widthA, widthB) * 256.0f * pixelRatio) / 2.0f },
         uniforms::u_image::Value{ 0 }
     );
 }
 
 LinePatternProgram::UniformValues
-LinePatternProgram::uniformValues(const style::LinePaintProperties& properties,
+LinePatternProgram::uniformValues(const LinePaintProperties::Evaluated& properties,
                                   const RenderTile& tile,
                                   const TransformState& state,
                                   const SpriteAtlasPosition& posA,
                                   const SpriteAtlasPosition& posB) {
      std::array<float, 2> sizeA {{
-         tile.id.pixelsToTileUnits(posA.size[0] * properties.linePattern.value.fromScale, state.getIntegerZoom()),
+         tile.id.pixelsToTileUnits(posA.size[0] * properties.get<LinePattern>().fromScale, state.getIntegerZoom()),
          posA.size[1]
      }};
 
      std::array<float, 2> sizeB {{
-         tile.id.pixelsToTileUnits(posB.size[0] * properties.linePattern.value.toScale, state.getIntegerZoom()),
+         tile.id.pixelsToTileUnits(posB.size[0] * properties.get<LinePattern>().toScale, state.getIntegerZoom()),
          posB.size[1]
      }};
 
@@ -117,7 +121,7 @@ LinePatternProgram::uniformValues(const style::LinePaintProperties& properties,
         uniforms::u_pattern_br_b::Value{ posB.br },
         uniforms::u_pattern_size_a::Value{ sizeA },
         uniforms::u_pattern_size_b::Value{ sizeB },
-        uniforms::u_fade::Value{ properties.linePattern.value.t },
+        uniforms::u_fade::Value{ properties.get<LinePattern>().t },
         uniforms::u_image::Value{ 0 }
     );
 }

src/mbgl/programs/line_program.hpp

@@ -6,16 +6,13 @@
 #include <mbgl/shader/line.hpp>
 #include <mbgl/shader/line_pattern.hpp>
 #include <mbgl/shader/line_sdf.hpp>
+#include <mbgl/style/layers/line_layer_properties.hpp>
 #include <mbgl/util/geometry.hpp>
 
 #include <cmath>
 
 namespace mbgl {
 
-namespace style {
-class LinePaintProperties;
-} // namespace style
-
 class RenderTile;
 class TransformState;
 class LinePatternPos;
@@ -104,7 +101,7 @@ class LineProgram : public Program<
 public:
     using Program::Program;
 
-    static UniformValues uniformValues(const style::LinePaintProperties&,
+    static UniformValues uniformValues(const style::LinePaintProperties::Evaluated&,
                                        const RenderTile&,
                                        const TransformState&);
 };
@@ -135,7 +132,7 @@ class LinePatternProgram : public Program<
 public:
     using Program::Program;
 
-    static UniformValues uniformValues(const style::LinePaintProperties&,
+    static UniformValues uniformValues(const style::LinePaintProperties::Evaluated&,
                                        const RenderTile&,
                                        const TransformState&,
                                        const SpriteAtlasPosition& posA,
@@ -168,7 +165,7 @@ class LineSDFProgram : public Program<
 public:
     using Program::Program;
 
-    static UniformValues uniformValues(const style::LinePaintProperties&,
+    static UniformValues uniformValues(const style::LinePaintProperties::Evaluated&,
                                        float pixelRatio,
                                        const RenderTile&,
                                        const TransformState&,

src/mbgl/renderer/line_bucket.cpp

@@ -64,7 +64,7 @@ void LineBucket::addGeometry(const GeometryCoordinates& coordinates) {
         return;
     }
 
-    const float miterLimit = layout.lineJoin == LineJoinType::Bevel ? 1.05f : float(layout.lineMiterLimit);
+    const float miterLimit = layout.get<LineJoin>() == LineJoinType::Bevel ? 1.05f : float(layout.get<LineMiterLimit>());
 
     const double sharpCornerOffset = SHARP_CORNER_OFFSET * (float(util::EXTENT) / (util::tileSize * overscaling));
 
@@ -77,8 +77,8 @@ void LineBucket::addGeometry(const GeometryCoordinates& coordinates) {
         return;
     }
 
-    const LineCapType beginCap = layout.lineCap;
-    const LineCapType endCap = closed ? LineCapType::Butt : LineCapType(layout.lineCap);
+    const LineCapType beginCap = layout.get<LineCap>();
+    const LineCapType endCap = closed ? LineCapType::Butt : LineCapType(layout.get<LineCap>());
 
     double distance = 0;
     bool startOfLine = true;
@@ -171,12 +171,12 @@ void LineBucket::addGeometry(const GeometryCoordinates& coordinates) {
 
         // The join if a middle vertex, otherwise the cap
         const bool middleVertex = prevCoordinate && nextCoordinate;
-        LineJoinType currentJoin = layout.lineJoin;
+        LineJoinType currentJoin = layout.get<LineJoin>();
         const LineCapType currentCap = nextCoordinate ? beginCap : endCap;
 
         if (middleVertex) {
             if (currentJoin == LineJoinType::Round) {
-                if (miterLength < layout.lineRoundLimit) {
+                if (miterLength < layout.get<LineRoundLimit>()) {
                     currentJoin = LineJoinType::Miter;
                 } else if (miterLength <= 2) {
                     currentJoin = LineJoinType::FakeRound;

src/mbgl/renderer/line_bucket.hpp

@@ -24,7 +24,7 @@ public:
     void addGeometry(const GeometryCollection&);
     void addGeometry(const GeometryCoordinates& line);
 
-    style::LineLayoutProperties layout;
+    style::LineLayoutProperties::Evaluated layout;
 
     gl::VertexVector<LineVertex> vertices;
     gl::IndexVector<gl::Triangles> triangles;

src/mbgl/renderer/painter_background.cpp

@@ -14,13 +14,13 @@ using namespace style;
 void Painter::renderBackground(PaintParameters& parameters, const BackgroundLayer& layer) {
     // Note that for bottommost layers without a pattern, the background color is drawn with
     // glClear rather than this method.
-    const BackgroundPaintProperties& properties = layer.impl->paint;
+    const BackgroundPaintProperties::Evaluated& properties = layer.impl->paint.evaluated;
 
-    if (!properties.backgroundPattern.value.to.empty()) {
+    if (!properties.get<BackgroundPattern>().to.empty()) {
         optional<SpriteAtlasPosition> imagePosA = spriteAtlas->getPosition(
-            properties.backgroundPattern.value.from, SpritePatternMode::Repeating);
+            properties.get<BackgroundPattern>().from, SpritePatternMode::Repeating);
         optional<SpriteAtlasPosition> imagePosB = spriteAtlas->getPosition(
-            properties.backgroundPattern.value.to, SpritePatternMode::Repeating);
+            properties.get<BackgroundPattern>().to, SpritePatternMode::Repeating);
 
         if (!imagePosA || !imagePosB)
             return;
@@ -36,11 +36,11 @@ void Painter::renderBackground(PaintParameters& parameters, const BackgroundLaye
                 colorModeForRenderPass(),
                 FillPatternUniforms::values(
                     matrixForTile(tileID),
-                    properties.backgroundOpacity.value,
+                    properties.get<BackgroundOpacity>(),
                     context.viewport.getCurrentValue().size,
                     *imagePosA,
                     *imagePosB,
-                    properties.backgroundPattern.value,
+                    properties.get<BackgroundPattern>(),
                     tileID,
                     state
                 ),
@@ -58,9 +58,9 @@ void Painter::renderBackground(PaintParameters& parameters, const BackgroundLaye
                 colorModeForRenderPass(),
                 FillProgram::UniformValues {
                     uniforms::u_matrix::Value{ matrixForTile(tileID) },
-                    uniforms::u_opacity::Value{ properties.backgroundOpacity.value },
-                    uniforms::u_color::Value{ properties.backgroundColor.value },
-                    uniforms::u_outline_color::Value{ properties.backgroundColor.value },
+                    uniforms::u_opacity::Value{ properties.get<BackgroundOpacity>() },
+                    uniforms::u_color::Value{ properties.get<BackgroundColor>() },
+                    uniforms::u_outline_color::Value{ properties.get<BackgroundColor>() },
                     uniforms::u_world::Value{ context.viewport.getCurrentValue().size },
                 },
                 tileTriangleVertexBuffer,

src/mbgl/renderer/painter_circle.cpp

@@ -20,8 +20,8 @@ void Painter::renderCircle(PaintParameters& parameters,
         return;
     }
 
-    const CirclePaintProperties& properties = layer.impl->paint;
-    const bool scaleWithMap = properties.circlePitchScale.value == CirclePitchScaleType::Map;
+    const CirclePaintProperties::Evaluated& properties = layer.impl->paint.evaluated;
+    const bool scaleWithMap = properties.get<CirclePitchScale>() == CirclePitchScaleType::Map;
 
     parameters.programs.circle.draw(
         context,
@@ -32,13 +32,15 @@ void Painter::renderCircle(PaintParameters& parameters,
             : gl::StencilMode::disabled(),
         colorModeForRenderPass(),
         CircleProgram::UniformValues {
-            uniforms::u_matrix::Value{ tile.translatedMatrix(properties.circleTranslate.value,
-                                       properties.circleTranslateAnchor.value,
-                                       state) },
-            uniforms::u_opacity::Value{ properties.circleOpacity.value },
-            uniforms::u_color::Value{ properties.circleColor.value },
-            uniforms::u_radius::Value{ properties.circleRadius.value },
-            uniforms::u_blur::Value{ properties.circleBlur.value },
+            uniforms::u_matrix::Value{
+                tile.translatedMatrix(properties.get<CircleTranslate>(),
+                                      properties.get<CircleTranslateAnchor>(),
+                                      state)
+            },
+            uniforms::u_opacity::Value{ properties.get<CircleOpacity>() },
+            uniforms::u_color::Value{ properties.get<CircleColor>() },
+            uniforms::u_radius::Value{ properties.get<CircleRadius>() },
+            uniforms::u_blur::Value{ properties.get<CircleBlur>() },
             uniforms::u_scale_with_map::Value{ scaleWithMap },
             uniforms::u_extrude_scale::Value{ scaleWithMap
                 ? std::array<float, 2> {{

src/mbgl/renderer/painter_fill.cpp

@@ -17,17 +17,17 @@ void Painter::renderFill(PaintParameters& parameters,
                          FillBucket& bucket,
                          const FillLayer& layer,
                          const RenderTile& tile) {
-    const FillPaintProperties& properties = layer.impl->paint;
+    const FillPaintProperties::Evaluated& properties = layer.impl->paint.evaluated;
 
-    if (!properties.fillPattern.value.from.empty()) {
+    if (!properties.get<FillPattern>().from.empty()) {
         if (pass != RenderPass::Translucent) {
             return;
         }
 
         optional<SpriteAtlasPosition> imagePosA = spriteAtlas->getPosition(
-            properties.fillPattern.value.from, SpritePatternMode::Repeating);
+            properties.get<FillPattern>().from, SpritePatternMode::Repeating);
         optional<SpriteAtlasPosition> imagePosB = spriteAtlas->getPosition(
-            properties.fillPattern.value.to, SpritePatternMode::Repeating);
+            properties.get<FillPattern>().to, SpritePatternMode::Repeating);
 
         if (!imagePosA || !imagePosB) {
             return;
@@ -48,14 +48,14 @@ void Painter::renderFill(PaintParameters& parameters,
                 stencilModeForClipping(tile.clip),
                 colorModeForRenderPass(),
                 FillPatternUniforms::values(
-                    tile.translatedMatrix(properties.fillTranslate.value,
-                                          properties.fillTranslateAnchor.value,
+                    tile.translatedMatrix(properties.get<FillTranslate>(),
+                                          properties.get<FillTranslateAnchor>(),
                                           state),
-                    properties.fillOpacity.value,
+                    properties.get<FillOpacity>(),
                     context.viewport.getCurrentValue().size,
                     *imagePosA,
                     *imagePosB,
-                    properties.fillPattern.value,
+                    properties.get<FillPattern>(),
                     tile.id,
                     state
                 ),
@@ -72,7 +72,7 @@ void Painter::renderFill(PaintParameters& parameters,
              *bucket.triangleIndexBuffer,
              bucket.triangleSegments);
 
-        if (!properties.fillAntialias.value || !properties.fillOutlineColor.isUndefined()) {
+        if (!properties.get<FillAntialias>() || !layer.impl->paint.unevaluated.get<FillOutlineColor>().isUndefined()) {
             return;
         }
 
@@ -97,11 +97,11 @@ void Painter::renderFill(PaintParameters& parameters,
                 stencilModeForClipping(tile.clip),
                 colorModeForRenderPass(),
                 FillProgram::UniformValues {
-                    uniforms::u_matrix::Value{ tile.translatedMatrix(properties.fillTranslate.value,
-                                               properties.fillTranslateAnchor.value,
+                    uniforms::u_matrix::Value{ tile.translatedMatrix(properties.get<FillTranslate>(),
+                                               properties.get<FillTranslateAnchor>(),
                                                state) },
-                    uniforms::u_opacity::Value{ properties.fillOpacity.value },
-                    uniforms::u_color::Value{ properties.fillColor.value },
+                    uniforms::u_opacity::Value{ properties.get<FillOpacity>() },
+                    uniforms::u_color::Value{ properties.get<FillColor>() },
                     uniforms::u_outline_color::Value{ outlineColor },
                     uniforms::u_world::Value{ context.viewport.getCurrentValue().size },
                 },
@@ -111,10 +111,10 @@ void Painter::renderFill(PaintParameters& parameters,
             );
         };
 
-        if (properties.fillAntialias.value && !properties.fillOutlineColor.isUndefined() && pass == RenderPass::Translucent) {
+        if (properties.get<FillAntialias>() && !layer.impl->paint.unevaluated.get<FillOutlineColor>().isUndefined() && pass == RenderPass::Translucent) {
             draw(2,
                  parameters.programs.fillOutline,
-                 properties.fillOutlineColor.value,
+                 properties.get<FillOutlineColor>(),
                  gl::Lines { 2.0f },
                  *bucket.vertexBuffer,
                  *bucket.lineIndexBuffer,
@@ -123,20 +123,20 @@ void Painter::renderFill(PaintParameters& parameters,
 
         // Only draw the fill when it's opaque and we're drawing opaque fragments,
         // or when it's translucent and we're drawing translucent fragments.
-        if ((properties.fillColor.value.a >= 1.0f && properties.fillOpacity.value >= 1.0f) == (pass == RenderPass::Opaque)) {
+        if ((properties.get<FillColor>().a >= 1.0f && properties.get<FillOpacity>() >= 1.0f) == (pass == RenderPass::Opaque)) {
             draw(1,
                  parameters.programs.fill,
-                 properties.fillOutlineColor.value,
+                 properties.get<FillOutlineColor>(),
                  gl::Triangles(),
                  *bucket.vertexBuffer,
                  *bucket.triangleIndexBuffer,
                  bucket.triangleSegments);
         }
 
-        if (properties.fillAntialias.value && properties.fillOutlineColor.isUndefined() && pass == RenderPass::Translucent) {
+        if (properties.get<FillAntialias>() && layer.impl->paint.unevaluated.get<FillOutlineColor>().isUndefined() && pass == RenderPass::Translucent) {
             draw(2,
                  parameters.programs.fillOutline,
-                 properties.fillColor.value,
+                 properties.get<FillColor>(),
                  gl::Lines { 2.0f },
                  *bucket.vertexBuffer,
                  *bucket.lineIndexBuffer,

src/mbgl/renderer/painter_line.cpp

@@ -21,7 +21,7 @@ void Painter::renderLine(PaintParameters& parameters,
         return;
     }
 
-    const auto& properties = layer.impl->paint;
+    const LinePaintProperties::Evaluated& properties = layer.impl->paint.evaluated;
 
     auto draw = [&] (auto& program, auto&& uniformValues) {
         program.draw(
@@ -37,11 +37,11 @@ void Painter::renderLine(PaintParameters& parameters,
         );
     };
 
-    if (!properties.lineDasharray.value.from.empty()) {
-        const LinePatternCap cap = bucket.layout.lineCap == LineCapType::Round
+    if (!properties.get<LineDasharray>().from.empty()) {
+        const LinePatternCap cap = bucket.layout.get<LineCap>() == LineCapType::Round
             ? LinePatternCap::Round : LinePatternCap::Square;
-        LinePatternPos posA = lineAtlas->getDashPosition(properties.lineDasharray.value.from, cap);
-        LinePatternPos posB = lineAtlas->getDashPosition(properties.lineDasharray.value.to, cap);
+        LinePatternPos posA = lineAtlas->getDashPosition(properties.get<LineDasharray>().from, cap);
+        LinePatternPos posB = lineAtlas->getDashPosition(properties.get<LineDasharray>().to, cap);
 
         lineAtlas->bind(context, 0);
 
@@ -56,11 +56,11 @@ void Painter::renderLine(PaintParameters& parameters,
                  layer.impl->dashLineWidth,
                  lineAtlas->getSize().width));
 
-    } else if (!properties.linePattern.value.from.empty()) {
+    } else if (!properties.get<LinePattern>().from.empty()) {
         optional<SpriteAtlasPosition> posA = spriteAtlas->getPosition(
-            properties.linePattern.value.from, SpritePatternMode::Repeating);
+            properties.get<LinePattern>().from, SpritePatternMode::Repeating);
         optional<SpriteAtlasPosition> posB = spriteAtlas->getPosition(
-            properties.linePattern.value.to, SpritePatternMode::Repeating);
+            properties.get<LinePattern>().to, SpritePatternMode::Repeating);
 
         if (!posA || !posB)
             return;

src/mbgl/renderer/painter_raster.cpp

@@ -48,7 +48,7 @@ void Painter::renderRaster(PaintParameters& parameters,
     if (!bucket.hasData())
         return;
 
-    const RasterPaintProperties& properties = layer.impl->paint;
+    const RasterPaintProperties::Evaluated& properties = layer.impl->paint.evaluated;
 
     assert(bucket.texture);
     context.bindTexture(*bucket.texture, 0, gl::TextureFilter::Linear);
@@ -64,13 +64,13 @@ void Painter::renderRaster(PaintParameters& parameters,
             uniforms::u_matrix::Value{ tile.matrix },
             uniforms::u_image0::Value{ 0 },
             uniforms::u_image1::Value{ 1 },
-            uniforms::u_opacity0::Value{ properties.rasterOpacity.value },
+            uniforms::u_opacity0::Value{ properties.get<RasterOpacity>() },
             uniforms::u_opacity1::Value{ 0 },
-            uniforms::u_brightness_low::Value{ properties.rasterBrightnessMin.value },
-            uniforms::u_brightness_high::Value{ properties.rasterBrightnessMax.value },
-            uniforms::u_saturation_factor::Value{ saturationFactor(properties.rasterSaturation.value) },
-            uniforms::u_contrast_factor::Value{ contrastFactor(properties.rasterContrast.value) },
-            uniforms::u_spin_weights::Value{ spinWeights(properties.rasterHueRotate.value) },
+            uniforms::u_brightness_low::Value{ properties.get<RasterBrightnessMin>() },
+            uniforms::u_brightness_high::Value{ properties.get<RasterBrightnessMax>() },
+            uniforms::u_saturation_factor::Value{ saturationFactor(properties.get<RasterSaturation>()) },
+            uniforms::u_contrast_factor::Value{ contrastFactor(properties.get<RasterContrast>()) },
+            uniforms::u_spin_weights::Value{ spinWeights(properties.get<RasterHueRotate>()) },
             uniforms::u_buffer_scale::Value{ 1.0f },
             uniforms::u_scale_parent::Value{ 1.0f },
             uniforms::u_tl_parent::Value{ std::array<float, 2> {{ 0.0f, 0.0f }} },

src/mbgl/renderer/painter_symbol.cpp

@@ -43,8 +43,8 @@ void Painter::renderSymbol(PaintParameters& parameters,
         // tile edges the icons are included in both tiles and clipped when drawing.
         //
         // TODO remove the `true ||` when #1673 is implemented
-        const bool drawAcrossEdges = (frame.mapMode == MapMode::Continuous) && (true || !(layout.textAllowOverlap || layout.iconAllowOverlap ||
-              layout.textIgnorePlacement || layout.iconIgnorePlacement));
+        const bool drawAcrossEdges = (frame.mapMode == MapMode::Continuous) && (true || !(layout.get<TextAllowOverlap>() || layout.get<IconAllowOverlap>() ||
+              layout.get<TextIgnorePlacement>() || layout.get<IconIgnorePlacement>()));
 
         program.draw(
             context,

src/mbgl/renderer/symbol_bucket.cpp

@@ -7,7 +7,7 @@ namespace mbgl {
 using namespace style;
 
 SymbolBucket::SymbolBucket(const MapMode mode_,
-                           style::SymbolLayoutProperties layout_,
+                           style::SymbolLayoutProperties::Evaluated layout_,
                            bool sdfIcons_,
                            bool iconsNeedLinear_)
     : mode(mode_),

src/mbgl/renderer/symbol_bucket.hpp

@@ -17,7 +17,7 @@ namespace mbgl {
 class SymbolBucket : public Bucket {
 public:
     SymbolBucket(const MapMode,
-                 style::SymbolLayoutProperties,
+                 style::SymbolLayoutProperties::Evaluated,
                  bool sdfIcons,
                  bool iconsNeedLinear);
 
@@ -29,7 +29,7 @@ public:
     bool hasCollisionBoxData() const;
 
     const MapMode mode;
-    const style::SymbolLayoutProperties layout;
+    const style::SymbolLayoutProperties::Evaluated layout;
     const bool sdfIcons;
     const bool iconsNeedLinear;
 

src/mbgl/style/class_dictionary.hpp

@@ -9,7 +9,6 @@ namespace mbgl {
 namespace style {
 
 enum class ClassID : uint32_t {
-    Fallback = 0, // These values are from the fallback properties
     Default = 1, // These values are from the default style for a layer
     Named = 2 // These values (and all subsequent IDs) are from a named style from the layer
 };

src/mbgl/style/layer_impl.hpp

@@ -19,7 +19,7 @@ class Bucket;
 namespace style {
 
 class CascadeParameters;
-class CalculationParameters;
+class PropertyEvaluationParameters;
 class BucketParameters;
 
 /**
@@ -57,7 +57,7 @@ public:
 
     // Fully evaluate cascaded paint properties based on a zoom level.
     // Returns true if any paint properties have active transitions.
-    virtual bool recalculate(const CalculationParameters&) = 0;
+    virtual bool evaluate(const PropertyEvaluationParameters&) = 0;
 
     virtual std::unique_ptr<Bucket> createBucket(BucketParameters&) const = 0;
 

src/mbgl/style/layers/background_layer.cpp

@@ -42,13 +42,13 @@ PropertyValue<Color> BackgroundLayer::getDefaultBackgroundColor() {
 }
 
 PropertyValue<Color> BackgroundLayer::getBackgroundColor(const optional<std::string>& klass) const {
-    return impl->paint.backgroundColor.get(klass);
+    return impl->paint.get<BackgroundColor>(klass);
 }
 
 void BackgroundLayer::setBackgroundColor(PropertyValue<Color> value, const optional<std::string>& klass) {
     if (value == getBackgroundColor(klass))
         return;
-    impl->paint.backgroundColor.set(value, klass);
+    impl->paint.set<BackgroundColor>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -57,13 +57,13 @@ PropertyValue<std::string> BackgroundLayer::getDefaultBackgroundPattern() {
 }
 
 PropertyValue<std::string> BackgroundLayer::getBackgroundPattern(const optional<std::string>& klass) const {
-    return impl->paint.backgroundPattern.get(klass);
+    return impl->paint.get<BackgroundPattern>(klass);
 }
 
 void BackgroundLayer::setBackgroundPattern(PropertyValue<std::string> value, const optional<std::string>& klass) {
     if (value == getBackgroundPattern(klass))
         return;
-    impl->paint.backgroundPattern.set(value, klass);
+    impl->paint.set<BackgroundPattern>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -72,13 +72,13 @@ PropertyValue<float> BackgroundLayer::getDefaultBackgroundOpacity() {
 }
 
 PropertyValue<float> BackgroundLayer::getBackgroundOpacity(const optional<std::string>& klass) const {
-    return impl->paint.backgroundOpacity.get(klass);
+    return impl->paint.get<BackgroundOpacity>(klass);
 }
 
 void BackgroundLayer::setBackgroundOpacity(PropertyValue<float> value, const optional<std::string>& klass) {
     if (value == getBackgroundOpacity(klass))
         return;
-    impl->paint.backgroundOpacity.set(value, klass);
+    impl->paint.set<BackgroundOpacity>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 

src/mbgl/style/layers/background_layer_impl.cpp

@@ -8,12 +8,12 @@ void BackgroundLayer::Impl::cascade(const CascadeParameters& parameters) {
     paint.cascade(parameters);
 }
 
-bool BackgroundLayer::Impl::recalculate(const CalculationParameters& parameters) {
-    bool hasTransitions = paint.recalculate(parameters);
+bool BackgroundLayer::Impl::evaluate(const PropertyEvaluationParameters& parameters) {
+    paint.evaluate(parameters);
 
-    passes = paint.backgroundOpacity > 0 ? RenderPass::Translucent : RenderPass::None;
+    passes = paint.evaluated.get<BackgroundOpacity>() > 0 ? RenderPass::Translucent : RenderPass::None;
 
-    return hasTransitions;
+    return paint.hasTransition();
 }
 
 std::unique_ptr<Bucket> BackgroundLayer::Impl::createBucket(BucketParameters&) const {

src/mbgl/style/layers/background_layer_impl.hpp

@@ -13,7 +13,7 @@ public:
     std::unique_ptr<Layer> cloneRef(const std::string& id) const override;
 
     void cascade(const CascadeParameters&) override;
-    bool recalculate(const CalculationParameters&) override;
+    bool evaluate(const PropertyEvaluationParameters&) override;
 
     std::unique_ptr<Bucket> createBucket(BucketParameters&) const override;
 

src/mbgl/style/layers/background_layer_properties.cpp

@@ -5,21 +5,5 @@
 namespace mbgl {
 namespace style {
 
-void BackgroundPaintProperties::cascade(const CascadeParameters& parameters) {
-    backgroundColor.cascade(parameters);
-    backgroundPattern.cascade(parameters);
-    backgroundOpacity.cascade(parameters);
-}
-
-bool BackgroundPaintProperties::recalculate(const CalculationParameters& parameters) {
-    bool hasTransitions = false;
-
-    hasTransitions |= backgroundColor.calculate(parameters);
-    hasTransitions |= backgroundPattern.calculate(parameters);
-    hasTransitions |= backgroundOpacity.calculate(parameters);
-
-    return hasTransitions;
-}
-
 } // namespace style
 } // namespace mbgl

src/mbgl/style/layers/background_layer_properties.hpp

@@ -9,18 +9,23 @@
 namespace mbgl {
 namespace style {
 
-class CascadeParameters;
-class CalculationParameters;
-
-class BackgroundPaintProperties {
-public:
-    void cascade(const CascadeParameters&);
-    bool recalculate(const CalculationParameters&);
-
-    PaintProperty<Color> backgroundColor { Color::black() };
-    PaintProperty<std::string, CrossFadedPropertyEvaluator> backgroundPattern { "" };
-    PaintProperty<float> backgroundOpacity { 1 };
+struct BackgroundColor : PaintProperty<Color> {
+    static Color defaultValue() { return Color::black(); }
 };
 
+struct BackgroundPattern : CrossFadedPaintProperty<std::string> {
+    static std::string defaultValue() { return ""; }
+};
+
+struct BackgroundOpacity : PaintProperty<float> {
+    static float defaultValue() { return 1; }
+};
+
+class BackgroundPaintProperties : public PaintProperties<
+    BackgroundColor,
+    BackgroundPattern,
+    BackgroundOpacity
+> {};
+
 } // namespace style
 } // namespace mbgl

src/mbgl/style/layers/circle_layer.cpp

@@ -67,13 +67,13 @@ PropertyValue<float> CircleLayer::getDefaultCircleRadius() {
 }
 
 PropertyValue<float> CircleLayer::getCircleRadius(const optional<std::string>& klass) const {
-    return impl->paint.circleRadius.get(klass);
+    return impl->paint.get<CircleRadius>(klass);
 }
 
 void CircleLayer::setCircleRadius(PropertyValue<float> value, const optional<std::string>& klass) {
     if (value == getCircleRadius(klass))
         return;
-    impl->paint.circleRadius.set(value, klass);
+    impl->paint.set<CircleRadius>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -82,13 +82,13 @@ PropertyValue<Color> CircleLayer::getDefaultCircleColor() {
 }
 
 PropertyValue<Color> CircleLayer::getCircleColor(const optional<std::string>& klass) const {
-    return impl->paint.circleColor.get(klass);
+    return impl->paint.get<CircleColor>(klass);
 }
 
 void CircleLayer::setCircleColor(PropertyValue<Color> value, const optional<std::string>& klass) {
     if (value == getCircleColor(klass))
         return;
-    impl->paint.circleColor.set(value, klass);
+    impl->paint.set<CircleColor>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -97,13 +97,13 @@ PropertyValue<float> CircleLayer::getDefaultCircleBlur() {
 }
 
 PropertyValue<float> CircleLayer::getCircleBlur(const optional<std::string>& klass) const {
-    return impl->paint.circleBlur.get(klass);
+    return impl->paint.get<CircleBlur>(klass);
 }
 
 void CircleLayer::setCircleBlur(PropertyValue<float> value, const optional<std::string>& klass) {
     if (value == getCircleBlur(klass))
         return;
-    impl->paint.circleBlur.set(value, klass);
+    impl->paint.set<CircleBlur>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -112,13 +112,13 @@ PropertyValue<float> CircleLayer::getDefaultCircleOpacity() {
 }
 
 PropertyValue<float> CircleLayer::getCircleOpacity(const optional<std::string>& klass) const {
-    return impl->paint.circleOpacity.get(klass);
+    return impl->paint.get<CircleOpacity>(klass);
 }
 
 void CircleLayer::setCircleOpacity(PropertyValue<float> value, const optional<std::string>& klass) {
     if (value == getCircleOpacity(klass))
         return;
-    impl->paint.circleOpacity.set(value, klass);
+    impl->paint.set<CircleOpacity>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -127,13 +127,13 @@ PropertyValue<std::array<float, 2>> CircleLayer::getDefaultCircleTranslate() {
 }
 
 PropertyValue<std::array<float, 2>> CircleLayer::getCircleTranslate(const optional<std::string>& klass) const {
-    return impl->paint.circleTranslate.get(klass);
+    return impl->paint.get<CircleTranslate>(klass);
 }
 
 void CircleLayer::setCircleTranslate(PropertyValue<std::array<float, 2>> value, const optional<std::string>& klass) {
     if (value == getCircleTranslate(klass))
         return;
-    impl->paint.circleTranslate.set(value, klass);
+    impl->paint.set<CircleTranslate>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -142,13 +142,13 @@ PropertyValue<TranslateAnchorType> CircleLayer::getDefaultCircleTranslateAnchor(
 }
 
 PropertyValue<TranslateAnchorType> CircleLayer::getCircleTranslateAnchor(const optional<std::string>& klass) const {
-    return impl->paint.circleTranslateAnchor.get(klass);
+    return impl->paint.get<CircleTranslateAnchor>(klass);
 }
 
 void CircleLayer::setCircleTranslateAnchor(PropertyValue<TranslateAnchorType> value, const optional<std::string>& klass) {
     if (value == getCircleTranslateAnchor(klass))
         return;
-    impl->paint.circleTranslateAnchor.set(value, klass);
+    impl->paint.set<CircleTranslateAnchor>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -157,13 +157,13 @@ PropertyValue<CirclePitchScaleType> CircleLayer::getDefaultCirclePitchScale() {
 }
 
 PropertyValue<CirclePitchScaleType> CircleLayer::getCirclePitchScale(const optional<std::string>& klass) const {
-    return impl->paint.circlePitchScale.get(klass);
+    return impl->paint.get<CirclePitchScale>(klass);
 }
 
 void CircleLayer::setCirclePitchScale(PropertyValue<CirclePitchScaleType> value, const optional<std::string>& klass) {
     if (value == getCirclePitchScale(klass))
         return;
-    impl->paint.circlePitchScale.set(value, klass);
+    impl->paint.set<CirclePitchScale>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 

src/mbgl/style/layers/circle_layer_impl.cpp

@@ -12,13 +12,13 @@ void CircleLayer::Impl::cascade(const CascadeParameters& parameters) {
     paint.cascade(parameters);
 }
 
-bool CircleLayer::Impl::recalculate(const CalculationParameters& parameters) {
-    bool hasTransitions = paint.recalculate(parameters);
+bool CircleLayer::Impl::evaluate(const PropertyEvaluationParameters& parameters) {
+    paint.evaluate(parameters);
 
-    passes = (paint.circleRadius > 0 && paint.circleColor.value.a > 0 && paint.circleOpacity > 0)
+    passes = (paint.evaluated.get<CircleRadius>() > 0 && paint.evaluated.get<CircleColor>().a > 0 && paint.evaluated.get<CircleOpacity>() > 0)
         ? RenderPass::Translucent : RenderPass::None;
 
-    return hasTransitions;
+    return paint.hasTransition();
 }
 
 std::unique_ptr<Bucket> CircleLayer::Impl::createBucket(BucketParameters& parameters) const {
@@ -35,8 +35,8 @@ std::unique_ptr<Bucket> CircleLayer::Impl::createBucket(BucketParameters& parame
 }
 
 float CircleLayer::Impl::getQueryRadius() const {
-    const std::array<float, 2>& translate = paint.circleTranslate;
-    return paint.circleRadius + util::length(translate[0], translate[1]);
+    const std::array<float, 2>& translate = paint.evaluated.get<CircleTranslate>();
+    return paint.evaluated.get<CircleRadius>() + util::length(translate[0], translate[1]);
 }
 
 bool CircleLayer::Impl::queryIntersectsGeometry(
@@ -46,9 +46,9 @@ bool CircleLayer::Impl::queryIntersectsGeometry(
         const float pixelsToTileUnits) const {
 
     auto translatedQueryGeometry = FeatureIndex::translateQueryGeometry(
-            queryGeometry, paint.circleTranslate, paint.circleTranslateAnchor, bearing, pixelsToTileUnits);
+            queryGeometry, paint.evaluated.get<CircleTranslate>(), paint.evaluated.get<CircleTranslateAnchor>(), bearing, pixelsToTileUnits);
 
-    auto circleRadius = paint.circleRadius * pixelsToTileUnits;
+    auto circleRadius = paint.evaluated.get<CircleRadius>() * pixelsToTileUnits;
 
     return util::polygonIntersectsBufferedMultiPoint(
             translatedQueryGeometry.value_or(queryGeometry), geometry, circleRadius);

src/mbgl/style/layers/circle_layer_impl.hpp

@@ -13,7 +13,7 @@ public:
     std::unique_ptr<Layer> cloneRef(const std::string& id) const override;
 
     void cascade(const CascadeParameters&) override;
-    bool recalculate(const CalculationParameters&) override;
+    bool evaluate(const PropertyEvaluationParameters&) override;
 
     std::unique_ptr<Bucket> createBucket(BucketParameters&) const override;
 

src/mbgl/style/layers/circle_layer_properties.cpp

@@ -5,29 +5,5 @@
 namespace mbgl {
 namespace style {
 
-void CirclePaintProperties::cascade(const CascadeParameters& parameters) {
-    circleRadius.cascade(parameters);
-    circleColor.cascade(parameters);
-    circleBlur.cascade(parameters);
-    circleOpacity.cascade(parameters);
-    circleTranslate.cascade(parameters);
-    circleTranslateAnchor.cascade(parameters);
-    circlePitchScale.cascade(parameters);
-}
-
-bool CirclePaintProperties::recalculate(const CalculationParameters& parameters) {
-    bool hasTransitions = false;
-
-    hasTransitions |= circleRadius.calculate(parameters);
-    hasTransitions |= circleColor.calculate(parameters);
-    hasTransitions |= circleBlur.calculate(parameters);
-    hasTransitions |= circleOpacity.calculate(parameters);
-    hasTransitions |= circleTranslate.calculate(parameters);
-    hasTransitions |= circleTranslateAnchor.calculate(parameters);
-    hasTransitions |= circlePitchScale.calculate(parameters);
-
-    return hasTransitions;
-}
-
 } // namespace style
 } // namespace mbgl

src/mbgl/style/layers/circle_layer_properties.hpp

@@ -9,22 +9,43 @@
 namespace mbgl {
 namespace style {
 
-class CascadeParameters;
-class CalculationParameters;
-
-class CirclePaintProperties {
-public:
-    void cascade(const CascadeParameters&);
-    bool recalculate(const CalculationParameters&);
-
-    PaintProperty<float> circleRadius { 5 };
-    PaintProperty<Color> circleColor { Color::black() };
-    PaintProperty<float> circleBlur { 0 };
-    PaintProperty<float> circleOpacity { 1 };
-    PaintProperty<std::array<float, 2>> circleTranslate { {{ 0, 0 }} };
-    PaintProperty<TranslateAnchorType> circleTranslateAnchor { TranslateAnchorType::Map };
-    PaintProperty<CirclePitchScaleType> circlePitchScale { CirclePitchScaleType::Map };
+struct CircleRadius : PaintProperty<float> {
+    static float defaultValue() { return 5; }
 };
 
+struct CircleColor : PaintProperty<Color> {
+    static Color defaultValue() { return Color::black(); }
+};
+
+struct CircleBlur : PaintProperty<float> {
+    static float defaultValue() { return 0; }
+};
+
+struct CircleOpacity : PaintProperty<float> {
+    static float defaultValue() { return 1; }
+};
+
+struct CircleTranslate : PaintProperty<std::array<float, 2>> {
+    static std::array<float, 2> defaultValue() { return {{ 0, 0 }}; }
+};
+
+struct CircleTranslateAnchor : PaintProperty<TranslateAnchorType> {
+    static TranslateAnchorType defaultValue() { return TranslateAnchorType::Map; }
+};
+
+struct CirclePitchScale : PaintProperty<CirclePitchScaleType> {
+    static CirclePitchScaleType defaultValue() { return CirclePitchScaleType::Map; }
+};
+
+class CirclePaintProperties : public PaintProperties<
+    CircleRadius,
+    CircleColor,
+    CircleBlur,
+    CircleOpacity,
+    CircleTranslate,
+    CircleTranslateAnchor,
+    CirclePitchScale
+> {};
+
 } // namespace style
 } // namespace mbgl

src/mbgl/style/layers/custom_layer_impl.cpp

@@ -62,7 +62,7 @@ void CustomLayer::Impl::render(const TransformState& state) const {
     renderFn(context, parameters);
 }
 
-bool CustomLayer::Impl::recalculate(const CalculationParameters&) {
+bool CustomLayer::Impl::evaluate(const PropertyEvaluationParameters&) {
     passes = RenderPass::Translucent;
     return false;
 }

src/mbgl/style/layers/custom_layer_impl.hpp

@@ -29,7 +29,7 @@ private:
     std::unique_ptr<Layer> cloneRef(const std::string& id) const override;
 
     void cascade(const CascadeParameters&) final {}
-    bool recalculate(const CalculationParameters&) final;
+    bool evaluate(const PropertyEvaluationParameters&) final;
 
     std::unique_ptr<Bucket> createBucket(BucketParameters&) const final;
 

src/mbgl/style/layers/fill_layer.cpp

@@ -67,13 +67,13 @@ PropertyValue<bool> FillLayer::getDefaultFillAntialias() {
 }
 
 PropertyValue<bool> FillLayer::getFillAntialias(const optional<std::string>& klass) const {
-    return impl->paint.fillAntialias.get(klass);
+    return impl->paint.get<FillAntialias>(klass);
 }
 
 void FillLayer::setFillAntialias(PropertyValue<bool> value, const optional<std::string>& klass) {
     if (value == getFillAntialias(klass))
         return;
-    impl->paint.fillAntialias.set(value, klass);
+    impl->paint.set<FillAntialias>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -82,13 +82,13 @@ PropertyValue<float> FillLayer::getDefaultFillOpacity() {
 }
 
 PropertyValue<float> FillLayer::getFillOpacity(const optional<std::string>& klass) const {
-    return impl->paint.fillOpacity.get(klass);
+    return impl->paint.get<FillOpacity>(klass);
 }
 
 void FillLayer::setFillOpacity(PropertyValue<float> value, const optional<std::string>& klass) {
     if (value == getFillOpacity(klass))
         return;
-    impl->paint.fillOpacity.set(value, klass);
+    impl->paint.set<FillOpacity>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -97,13 +97,13 @@ PropertyValue<Color> FillLayer::getDefaultFillColor() {
 }
 
 PropertyValue<Color> FillLayer::getFillColor(const optional<std::string>& klass) const {
-    return impl->paint.fillColor.get(klass);
+    return impl->paint.get<FillColor>(klass);
 }
 
 void FillLayer::setFillColor(PropertyValue<Color> value, const optional<std::string>& klass) {
     if (value == getFillColor(klass))
         return;
-    impl->paint.fillColor.set(value, klass);
+    impl->paint.set<FillColor>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -112,13 +112,13 @@ PropertyValue<Color> FillLayer::getDefaultFillOutlineColor() {
 }
 
 PropertyValue<Color> FillLayer::getFillOutlineColor(const optional<std::string>& klass) const {
-    return impl->paint.fillOutlineColor.get(klass);
+    return impl->paint.get<FillOutlineColor>(klass);
 }
 
 void FillLayer::setFillOutlineColor(PropertyValue<Color> value, const optional<std::string>& klass) {
     if (value == getFillOutlineColor(klass))
         return;
-    impl->paint.fillOutlineColor.set(value, klass);
+    impl->paint.set<FillOutlineColor>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -127,13 +127,13 @@ PropertyValue<std::array<float, 2>> FillLayer::getDefaultFillTranslate() {
 }
 
 PropertyValue<std::array<float, 2>> FillLayer::getFillTranslate(const optional<std::string>& klass) const {
-    return impl->paint.fillTranslate.get(klass);
+    return impl->paint.get<FillTranslate>(klass);
 }
 
 void FillLayer::setFillTranslate(PropertyValue<std::array<float, 2>> value, const optional<std::string>& klass) {
     if (value == getFillTranslate(klass))
         return;
-    impl->paint.fillTranslate.set(value, klass);
+    impl->paint.set<FillTranslate>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -142,13 +142,13 @@ PropertyValue<TranslateAnchorType> FillLayer::getDefaultFillTranslateAnchor() {
 }
 
 PropertyValue<TranslateAnchorType> FillLayer::getFillTranslateAnchor(const optional<std::string>& klass) const {
-    return impl->paint.fillTranslateAnchor.get(klass);
+    return impl->paint.get<FillTranslateAnchor>(klass);
 }
 
 void FillLayer::setFillTranslateAnchor(PropertyValue<TranslateAnchorType> value, const optional<std::string>& klass) {
     if (value == getFillTranslateAnchor(klass))
         return;
-    impl->paint.fillTranslateAnchor.set(value, klass);
+    impl->paint.set<FillTranslateAnchor>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -157,13 +157,13 @@ PropertyValue<std::string> FillLayer::getDefaultFillPattern() {
 }
 
 PropertyValue<std::string> FillLayer::getFillPattern(const optional<std::string>& klass) const {
-    return impl->paint.fillPattern.get(klass);
+    return impl->paint.get<FillPattern>(klass);
 }
 
 void FillLayer::setFillPattern(PropertyValue<std::string> value, const optional<std::string>& klass) {
     if (value == getFillPattern(klass))
         return;
-    impl->paint.fillPattern.set(value, klass);
+    impl->paint.set<FillPattern>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 

src/mbgl/style/layers/fill_layer_impl.cpp

@@ -12,22 +12,22 @@ void FillLayer::Impl::cascade(const CascadeParameters& parameters) {
     paint.cascade(parameters);
 }
 
-bool FillLayer::Impl::recalculate(const CalculationParameters& parameters) {
-    bool hasTransitions = paint.recalculate(parameters);
+bool FillLayer::Impl::evaluate(const PropertyEvaluationParameters& parameters) {
+    paint.evaluate(parameters);
 
     passes = RenderPass::None;
 
-    if (paint.fillAntialias) {
+    if (paint.evaluated.get<FillAntialias>()) {
         passes |= RenderPass::Translucent;
     }
 
-    if (!paint.fillPattern.value.from.empty() || (paint.fillColor.value.a * paint.fillOpacity) < 1.0f) {
+    if (!paint.evaluated.get<FillPattern>().from.empty() || (paint.evaluated.get<FillColor>().a * paint.evaluated.get<FillOpacity>()) < 1.0f) {
         passes |= RenderPass::Translucent;
     } else {
         passes |= RenderPass::Opaque;
     }
 
-    return hasTransitions;
+    return paint.hasTransition();
 }
 
 std::unique_ptr<Bucket> FillLayer::Impl::createBucket(BucketParameters& parameters) const {
@@ -44,7 +44,7 @@ std::unique_ptr<Bucket> FillLayer::Impl::createBucket(BucketParameters& paramete
 }
 
 float FillLayer::Impl::getQueryRadius() const {
-    const std::array<float, 2>& translate = paint.fillTranslate;
+    const std::array<float, 2>& translate = paint.evaluated.get<FillTranslate>();
     return util::length(translate[0], translate[1]);
 }
 
@@ -55,7 +55,7 @@ bool FillLayer::Impl::queryIntersectsGeometry(
         const float pixelsToTileUnits) const {
 
     auto translatedQueryGeometry = FeatureIndex::translateQueryGeometry(
-            queryGeometry, paint.fillTranslate, paint.fillTranslateAnchor, bearing, pixelsToTileUnits);
+            queryGeometry, paint.evaluated.get<FillTranslate>(), paint.evaluated.get<FillTranslateAnchor>(), bearing, pixelsToTileUnits);
 
     return util::polygonIntersectsMultiPolygon(translatedQueryGeometry.value_or(queryGeometry), geometry);
 }

src/mbgl/style/layers/fill_layer_impl.hpp

@@ -13,7 +13,7 @@ public:
     std::unique_ptr<Layer> cloneRef(const std::string& id) const override;
 
     void cascade(const CascadeParameters&) override;
-    bool recalculate(const CalculationParameters&) override;
+    bool evaluate(const PropertyEvaluationParameters&) override;
 
     std::unique_ptr<Bucket> createBucket(BucketParameters&) const override;
 

src/mbgl/style/layers/fill_layer_properties.cpp

@@ -5,29 +5,5 @@
 namespace mbgl {
 namespace style {
 
-void FillPaintProperties::cascade(const CascadeParameters& parameters) {
-    fillAntialias.cascade(parameters);
-    fillOpacity.cascade(parameters);
-    fillColor.cascade(parameters);
-    fillOutlineColor.cascade(parameters);
-    fillTranslate.cascade(parameters);
-    fillTranslateAnchor.cascade(parameters);
-    fillPattern.cascade(parameters);
-}
-
-bool FillPaintProperties::recalculate(const CalculationParameters& parameters) {
-    bool hasTransitions = false;
-
-    hasTransitions |= fillAntialias.calculate(parameters);
-    hasTransitions |= fillOpacity.calculate(parameters);
-    hasTransitions |= fillColor.calculate(parameters);
-    hasTransitions |= fillOutlineColor.calculate(parameters);
-    hasTransitions |= fillTranslate.calculate(parameters);
-    hasTransitions |= fillTranslateAnchor.calculate(parameters);
-    hasTransitions |= fillPattern.calculate(parameters);
-
-    return hasTransitions;
-}
-
 } // namespace style
 } // namespace mbgl

src/mbgl/style/layers/fill_layer_properties.hpp

@@ -9,22 +9,43 @@
 namespace mbgl {
 namespace style {
 
-class CascadeParameters;
-class CalculationParameters;
-
-class FillPaintProperties {
-public:
-    void cascade(const CascadeParameters&);
-    bool recalculate(const CalculationParameters&);
-
-    PaintProperty<bool> fillAntialias { true };
-    PaintProperty<float> fillOpacity { 1 };
-    PaintProperty<Color> fillColor { Color::black() };
-    PaintProperty<Color> fillOutlineColor { {} };
-    PaintProperty<std::array<float, 2>> fillTranslate { {{ 0, 0 }} };
-    PaintProperty<TranslateAnchorType> fillTranslateAnchor { TranslateAnchorType::Map };
-    PaintProperty<std::string, CrossFadedPropertyEvaluator> fillPattern { "" };
+struct FillAntialias : PaintProperty<bool> {
+    static bool defaultValue() { return true; }
 };
 
+struct FillOpacity : PaintProperty<float> {
+    static float defaultValue() { return 1; }
+};
+
+struct FillColor : PaintProperty<Color> {
+    static Color defaultValue() { return Color::black(); }
+};
+
+struct FillOutlineColor : PaintProperty<Color> {
+    static Color defaultValue() { return {}; }
+};
+
+struct FillTranslate : PaintProperty<std::array<float, 2>> {
+    static std::array<float, 2> defaultValue() { return {{ 0, 0 }}; }
+};
+
+struct FillTranslateAnchor : PaintProperty<TranslateAnchorType> {
+    static TranslateAnchorType defaultValue() { return TranslateAnchorType::Map; }
+};
+
+struct FillPattern : CrossFadedPaintProperty<std::string> {
+    static std::string defaultValue() { return ""; }
+};
+
+class FillPaintProperties : public PaintProperties<
+    FillAntialias,
+    FillOpacity,
+    FillColor,
+    FillOutlineColor,
+    FillTranslate,
+    FillTranslateAnchor,
+    FillPattern
+> {};
+
 } // namespace style
 } // namespace mbgl

src/mbgl/style/layers/layer.cpp.ejs

@@ -78,17 +78,17 @@ const Filter& <%- camelize(type) %>Layer::getFilter() const {
 
 <% for (const property of layoutProperties) { -%>
 PropertyValue<<%- propertyType(property) %>> <%- camelize(type) %>Layer::getDefault<%- camelize(property.name) %>() {
-    return { <%- defaultValue(property) %> };
+    return <%- camelize(property.name) %>::defaultValue();
 }
 
 PropertyValue<<%- propertyType(property) %>> <%- camelize(type) %>Layer::get<%- camelize(property.name) %>() const {
-    return impl->layout.<%- camelizeWithLeadingLowercase(property.name) %>.get();
+    return impl->layout.unevaluated.get<<%- camelize(property.name) %>>();
 }
 
 void <%- camelize(type) %>Layer::set<%- camelize(property.name) %>(PropertyValue<<%- propertyType(property) %>> value) {
     if (value == get<%- camelize(property.name) %>())
         return;
-    impl->layout.<%- camelizeWithLeadingLowercase(property.name) %>.set(value);
+    impl->layout.unevaluated.get<<%- camelize(property.name) %>>() = value;
     impl->observer->onLayerLayoutPropertyChanged(*this, "<%- property.name %>");
 }
 <% } -%>
@@ -100,13 +100,13 @@ PropertyValue<<%- propertyType(property) %>> <%- camelize(type) %>Layer::getDefa
 }
 
 PropertyValue<<%- propertyType(property) %>> <%- camelize(type) %>Layer::get<%- camelize(property.name) %>(const optional<std::string>& klass) const {
-    return impl->paint.<%- camelizeWithLeadingLowercase(property.name) %>.get(klass);
+    return impl->paint.get<<%- camelize(property.name) %>>(klass);
 }
 
 void <%- camelize(type) %>Layer::set<%- camelize(property.name) %>(PropertyValue<<%- propertyType(property) %>> value, const optional<std::string>& klass) {
     if (value == get<%- camelize(property.name) %>(klass))
         return;
-    impl->paint.<%- camelizeWithLeadingLowercase(property.name) %>.set(value, klass);
+    impl->paint.set<<%- camelize(property.name) %>>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 <% } -%>

src/mbgl/style/layers/layer_properties.cpp.ejs

@@ -10,29 +10,5 @@
 namespace mbgl {
 namespace style {
 
-<% if (layoutProperties.length) { -%>
-void <%- camelize(type) %>LayoutProperties::recalculate(const CalculationParameters& parameters) {
-<% for (const property of layoutProperties) { -%>
-    <%- camelizeWithLeadingLowercase(property.name) %>.calculate(parameters);
-<% } -%>
-}
-
-<% } -%>
-void <%- camelize(type) %>PaintProperties::cascade(const CascadeParameters& parameters) {
-<% for (const property of paintProperties) { -%>
-    <%- camelizeWithLeadingLowercase(property.name) %>.cascade(parameters);
-<% } -%>
-}
-
-bool <%- camelize(type) %>PaintProperties::recalculate(const CalculationParameters& parameters) {
-    bool hasTransitions = false;
-
-<% for (const property of paintProperties) { -%>
-    hasTransitions |= <%- camelizeWithLeadingLowercase(property.name) %>.calculate(parameters);
-<% } -%>
-
-    return hasTransitions;
-}
-
 } // namespace style
 } // namespace mbgl

src/mbgl/style/layers/layer_properties.hpp.ejs

@@ -14,33 +14,35 @@
 namespace mbgl {
 namespace style {
 
-class CascadeParameters;
-class CalculationParameters;
-
-<% if (layoutProperties.length) { -%>
-class <%- camelize(type) %>LayoutProperties {
-public:
-    void recalculate(const CalculationParameters&);
-
 <% for (const property of layoutProperties) { -%>
-    LayoutProperty<<%- propertyType(property) %>> <%- camelizeWithLeadingLowercase(property.name) %> { <%- defaultValue(property) %> };
-<% } -%>
+struct <%- camelize(property.name) %> : LayoutProperty<<%- propertyType(property) %>> {
+    static <%- propertyType(property) %> defaultValue() { return <%- defaultValue(property) %>; }
 };
 
 <% } -%>
-class <%- camelize(type) %>PaintProperties {
-public:
-    void cascade(const CascadeParameters&);
-    bool recalculate(const CalculationParameters&);
-
 <% for (const property of paintProperties) { -%>
-<% if (/-pattern$/.test(property.name) || property.name === 'line-dasharray') { -%>
-    PaintProperty<<%- propertyType(property) %>, CrossFadedPropertyEvaluator> <%- camelizeWithLeadingLowercase(property.name) %> { <%- defaultValue(property) %> };
-<% } else { -%>
-    PaintProperty<<%- propertyType(property) %>> <%- camelizeWithLeadingLowercase(property.name) %> { <%- defaultValue(property) %> };
-<% } -%>
-<% } -%>
+struct <%- camelize(property.name) %> : <%
+if (/-pattern$/.test(property.name) || property.name === 'line-dasharray') {
+%>CrossFaded<% } -%>PaintProperty<<%- propertyType(property) %>> {
+    static <%- propertyType(property) %> defaultValue() { return <%- defaultValue(property) %>; }
 };
 
+<% } -%>
+<% if (layoutProperties.length) { -%>
+class <%- camelize(type) %>LayoutProperties : public LayoutProperties<
+<% for (const property of layoutProperties.slice(0, -1)) { -%>
+    <%- camelize(property.name) %>,
+<% } -%>
+    <%- camelize(layoutProperties.slice(-1)[0].name) %>
+> {};
+
+<% } -%>
+class <%- camelize(type) %>PaintProperties : public PaintProperties<
+<% for (const property of paintProperties.slice(0, -1)) { -%>
+    <%- camelize(property.name) %>,
+<% } -%>
+    <%- camelize(paintProperties.slice(-1)[0].name) %>
+> {};
+
 } // namespace style
 } // namespace mbgl

src/mbgl/style/layers/line_layer.cpp

@@ -60,59 +60,59 @@ const Filter& LineLayer::getFilter() const {
 // Layout properties
 
 PropertyValue<LineCapType> LineLayer::getDefaultLineCap() {
-    return { LineCapType::Butt };
+    return LineCap::defaultValue();
 }
 
 PropertyValue<LineCapType> LineLayer::getLineCap() const {
-    return impl->layout.lineCap.get();
+    return impl->layout.unevaluated.get<LineCap>();
 }
 
 void LineLayer::setLineCap(PropertyValue<LineCapType> value) {
     if (value == getLineCap())
         return;
-    impl->layout.lineCap.set(value);
+    impl->layout.unevaluated.get<LineCap>() = value;
     impl->observer->onLayerLayoutPropertyChanged(*this, "line-cap");
 }
 PropertyValue<LineJoinType> LineLayer::getDefaultLineJoin() {
-    return { LineJoinType::Miter };
+    return LineJoin::defaultValue();
 }
 
 PropertyValue<LineJoinType> LineLayer::getLineJoin() const {
-    return impl->layout.lineJoin.get();
+    return impl->layout.unevaluated.get<LineJoin>();
 }
 
 void LineLayer::setLineJoin(PropertyValue<LineJoinType> value) {
     if (value == getLineJoin())
         return;
-    impl->layout.lineJoin.set(value);
+    impl->layout.unevaluated.get<LineJoin>() = value;
     impl->observer->onLayerLayoutPropertyChanged(*this, "line-join");
 }
 PropertyValue<float> LineLayer::getDefaultLineMiterLimit() {
-    return { 2 };
+    return LineMiterLimit::defaultValue();
 }
 
 PropertyValue<float> LineLayer::getLineMiterLimit() const {
-    return impl->layout.lineMiterLimit.get();
+    return impl->layout.unevaluated.get<LineMiterLimit>();
 }
 
 void LineLayer::setLineMiterLimit(PropertyValue<float> value) {
     if (value == getLineMiterLimit())
         return;
-    impl->layout.lineMiterLimit.set(value);
+    impl->layout.unevaluated.get<LineMiterLimit>() = value;
     impl->observer->onLayerLayoutPropertyChanged(*this, "line-miter-limit");
 }
 PropertyValue<float> LineLayer::getDefaultLineRoundLimit() {
-    return { 1 };
+    return LineRoundLimit::defaultValue();
 }
 
 PropertyValue<float> LineLayer::getLineRoundLimit() const {
-    return impl->layout.lineRoundLimit.get();
+    return impl->layout.unevaluated.get<LineRoundLimit>();
 }
 
 void LineLayer::setLineRoundLimit(PropertyValue<float> value) {
     if (value == getLineRoundLimit())
         return;
-    impl->layout.lineRoundLimit.set(value);
+    impl->layout.unevaluated.get<LineRoundLimit>() = value;
     impl->observer->onLayerLayoutPropertyChanged(*this, "line-round-limit");
 }
 
@@ -123,13 +123,13 @@ PropertyValue<float> LineLayer::getDefaultLineOpacity() {
 }
 
 PropertyValue<float> LineLayer::getLineOpacity(const optional<std::string>& klass) const {
-    return impl->paint.lineOpacity.get(klass);
+    return impl->paint.get<LineOpacity>(klass);
 }
 
 void LineLayer::setLineOpacity(PropertyValue<float> value, const optional<std::string>& klass) {
     if (value == getLineOpacity(klass))
         return;
-    impl->paint.lineOpacity.set(value, klass);
+    impl->paint.set<LineOpacity>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -138,13 +138,13 @@ PropertyValue<Color> LineLayer::getDefaultLineColor() {
 }
 
 PropertyValue<Color> LineLayer::getLineColor(const optional<std::string>& klass) const {
-    return impl->paint.lineColor.get(klass);
+    return impl->paint.get<LineColor>(klass);
 }
 
 void LineLayer::setLineColor(PropertyValue<Color> value, const optional<std::string>& klass) {
     if (value == getLineColor(klass))
         return;
-    impl->paint.lineColor.set(value, klass);
+    impl->paint.set<LineColor>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -153,13 +153,13 @@ PropertyValue<std::array<float, 2>> LineLayer::getDefaultLineTranslate() {
 }
 
 PropertyValue<std::array<float, 2>> LineLayer::getLineTranslate(const optional<std::string>& klass) const {
-    return impl->paint.lineTranslate.get(klass);
+    return impl->paint.get<LineTranslate>(klass);
 }
 
 void LineLayer::setLineTranslate(PropertyValue<std::array<float, 2>> value, const optional<std::string>& klass) {
     if (value == getLineTranslate(klass))
         return;
-    impl->paint.lineTranslate.set(value, klass);
+    impl->paint.set<LineTranslate>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -168,13 +168,13 @@ PropertyValue<TranslateAnchorType> LineLayer::getDefaultLineTranslateAnchor() {
 }
 
 PropertyValue<TranslateAnchorType> LineLayer::getLineTranslateAnchor(const optional<std::string>& klass) const {
-    return impl->paint.lineTranslateAnchor.get(klass);
+    return impl->paint.get<LineTranslateAnchor>(klass);
 }
 
 void LineLayer::setLineTranslateAnchor(PropertyValue<TranslateAnchorType> value, const optional<std::string>& klass) {
     if (value == getLineTranslateAnchor(klass))
         return;
-    impl->paint.lineTranslateAnchor.set(value, klass);
+    impl->paint.set<LineTranslateAnchor>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -183,13 +183,13 @@ PropertyValue<float> LineLayer::getDefaultLineWidth() {
 }
 
 PropertyValue<float> LineLayer::getLineWidth(const optional<std::string>& klass) const {
-    return impl->paint.lineWidth.get(klass);
+    return impl->paint.get<LineWidth>(klass);
 }
 
 void LineLayer::setLineWidth(PropertyValue<float> value, const optional<std::string>& klass) {
     if (value == getLineWidth(klass))
         return;
-    impl->paint.lineWidth.set(value, klass);
+    impl->paint.set<LineWidth>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -198,13 +198,13 @@ PropertyValue<float> LineLayer::getDefaultLineGapWidth() {
 }
 
 PropertyValue<float> LineLayer::getLineGapWidth(const optional<std::string>& klass) const {
-    return impl->paint.lineGapWidth.get(klass);
+    return impl->paint.get<LineGapWidth>(klass);
 }
 
 void LineLayer::setLineGapWidth(PropertyValue<float> value, const optional<std::string>& klass) {
     if (value == getLineGapWidth(klass))
         return;
-    impl->paint.lineGapWidth.set(value, klass);
+    impl->paint.set<LineGapWidth>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -213,13 +213,13 @@ PropertyValue<float> LineLayer::getDefaultLineOffset() {
 }
 
 PropertyValue<float> LineLayer::getLineOffset(const optional<std::string>& klass) const {
-    return impl->paint.lineOffset.get(klass);
+    return impl->paint.get<LineOffset>(klass);
 }
 
 void LineLayer::setLineOffset(PropertyValue<float> value, const optional<std::string>& klass) {
     if (value == getLineOffset(klass))
         return;
-    impl->paint.lineOffset.set(value, klass);
+    impl->paint.set<LineOffset>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -228,13 +228,13 @@ PropertyValue<float> LineLayer::getDefaultLineBlur() {
 }
 
 PropertyValue<float> LineLayer::getLineBlur(const optional<std::string>& klass) const {
-    return impl->paint.lineBlur.get(klass);
+    return impl->paint.get<LineBlur>(klass);
 }
 
 void LineLayer::setLineBlur(PropertyValue<float> value, const optional<std::string>& klass) {
     if (value == getLineBlur(klass))
         return;
-    impl->paint.lineBlur.set(value, klass);
+    impl->paint.set<LineBlur>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -243,13 +243,13 @@ PropertyValue<std::vector<float>> LineLayer::getDefaultLineDasharray() {
 }
 
 PropertyValue<std::vector<float>> LineLayer::getLineDasharray(const optional<std::string>& klass) const {
-    return impl->paint.lineDasharray.get(klass);
+    return impl->paint.get<LineDasharray>(klass);
 }
 
 void LineLayer::setLineDasharray(PropertyValue<std::vector<float>> value, const optional<std::string>& klass) {
     if (value == getLineDasharray(klass))
         return;
-    impl->paint.lineDasharray.set(value, klass);
+    impl->paint.set<LineDasharray>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -258,13 +258,13 @@ PropertyValue<std::string> LineLayer::getDefaultLinePattern() {
 }
 
 PropertyValue<std::string> LineLayer::getLinePattern(const optional<std::string>& klass) const {
-    return impl->paint.linePattern.get(klass);
+    return impl->paint.get<LinePattern>(klass);
 }
 
 void LineLayer::setLinePattern(PropertyValue<std::string> value, const optional<std::string>& klass) {
     if (value == getLinePattern(klass))
         return;
-    impl->paint.linePattern.set(value, klass);
+    impl->paint.set<LinePattern>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 

src/mbgl/style/layers/line_layer_impl.cpp

@@ -12,26 +12,24 @@ void LineLayer::Impl::cascade(const CascadeParameters& parameters) {
     paint.cascade(parameters);
 }
 
-bool LineLayer::Impl::recalculate(const CalculationParameters& parameters) {
+bool LineLayer::Impl::evaluate(const PropertyEvaluationParameters& parameters) {
     // for scaling dasharrays
-    CalculationParameters dashArrayParams = parameters;
+    PropertyEvaluationParameters dashArrayParams = parameters;
     dashArrayParams.z = std::floor(dashArrayParams.z);
-    paint.lineWidth.calculate(dashArrayParams);
-    dashLineWidth = paint.lineWidth;
+    dashLineWidth = paint.evaluate<LineWidth>(dashArrayParams);
 
-    bool hasTransitions = paint.recalculate(parameters);
+    paint.evaluate(parameters);
 
-    passes = (paint.lineOpacity > 0 && paint.lineColor.value.a > 0 && paint.lineWidth > 0)
+    passes = (paint.evaluated.get<LineOpacity>() > 0 && paint.evaluated.get<LineColor>().a > 0 && paint.evaluated.get<LineWidth>() > 0)
         ? RenderPass::Translucent : RenderPass::None;
 
-    return hasTransitions;
+    return paint.hasTransition();
 }
 
 std::unique_ptr<Bucket> LineLayer::Impl::createBucket(BucketParameters& parameters) const {
     auto bucket = std::make_unique<LineBucket>(parameters.tileID.overscaleFactor());
 
-    bucket->layout = layout;
-    bucket->layout.recalculate(CalculationParameters(parameters.tileID.overscaledZ));
+    bucket->layout = layout.evaluate(PropertyEvaluationParameters(parameters.tileID.overscaledZ));
 
     auto& name = bucketName();
     parameters.eachFilteredFeature(filter, [&] (const auto& feature, std::size_t index, const std::string& layerName) {
@@ -44,10 +42,10 @@ std::unique_ptr<Bucket> LineLayer::Impl::createBucket(BucketParameters& paramete
 }
 
 float LineLayer::Impl::getLineWidth() const {
-    if (paint.lineGapWidth > 0) {
-        return paint.lineGapWidth + 2 * paint.lineWidth;
+    if (paint.evaluated.get<LineGapWidth>() > 0) {
+        return paint.evaluated.get<LineGapWidth>() + 2 * paint.evaluated.get<LineWidth>();
     } else {
-        return paint.lineWidth;
+        return paint.evaluated.get<LineWidth>();
     }
 }
 
@@ -82,8 +80,8 @@ optional<GeometryCollection> offsetLine(const GeometryCollection& rings, const d
 }
 
 float LineLayer::Impl::getQueryRadius() const {
-    const std::array<float, 2>& translate = paint.lineTranslate;
-    return getLineWidth() / 2.0 + std::abs(paint.lineOffset) + util::length(translate[0], translate[1]);
+    const std::array<float, 2>& translate = paint.evaluated.get<LineTranslate>();
+    return getLineWidth() / 2.0 + std::abs(paint.evaluated.get<LineOffset>()) + util::length(translate[0], translate[1]);
 }
 
 bool LineLayer::Impl::queryIntersectsGeometry(
@@ -95,8 +93,8 @@ bool LineLayer::Impl::queryIntersectsGeometry(
     const float halfWidth = getLineWidth() / 2.0 * pixelsToTileUnits;
 
     auto translatedQueryGeometry = FeatureIndex::translateQueryGeometry(
-            queryGeometry, paint.lineTranslate, paint.lineTranslateAnchor, bearing, pixelsToTileUnits);
-    auto offsetGeometry = offsetLine(geometry, paint.lineOffset * pixelsToTileUnits);
+            queryGeometry, paint.evaluated.get<LineTranslate>(), paint.evaluated.get<LineTranslateAnchor>(), bearing, pixelsToTileUnits);
+    auto offsetGeometry = offsetLine(geometry, paint.evaluated.get<LineOffset>() * pixelsToTileUnits);
 
     return util::polygonIntersectsBufferedMultiLine(
             translatedQueryGeometry.value_or(queryGeometry),

src/mbgl/style/layers/line_layer_impl.hpp

@@ -13,7 +13,7 @@ public:
     std::unique_ptr<Layer> cloneRef(const std::string& id) const override;
 
     void cascade(const CascadeParameters&) override;
-    bool recalculate(const CalculationParameters&) override;
+    bool evaluate(const PropertyEvaluationParameters&) override;
 
     std::unique_ptr<Bucket> createBucket(BucketParameters&) const override;
 

src/mbgl/style/layers/line_layer_properties.cpp

@@ -5,42 +5,5 @@
 namespace mbgl {
 namespace style {
 
-void LineLayoutProperties::recalculate(const CalculationParameters& parameters) {
-    lineCap.calculate(parameters);
-    lineJoin.calculate(parameters);
-    lineMiterLimit.calculate(parameters);
-    lineRoundLimit.calculate(parameters);
-}
-
-void LinePaintProperties::cascade(const CascadeParameters& parameters) {
-    lineOpacity.cascade(parameters);
-    lineColor.cascade(parameters);
-    lineTranslate.cascade(parameters);
-    lineTranslateAnchor.cascade(parameters);
-    lineWidth.cascade(parameters);
-    lineGapWidth.cascade(parameters);
-    lineOffset.cascade(parameters);
-    lineBlur.cascade(parameters);
-    lineDasharray.cascade(parameters);
-    linePattern.cascade(parameters);
-}
-
-bool LinePaintProperties::recalculate(const CalculationParameters& parameters) {
-    bool hasTransitions = false;
-
-    hasTransitions |= lineOpacity.calculate(parameters);
-    hasTransitions |= lineColor.calculate(parameters);
-    hasTransitions |= lineTranslate.calculate(parameters);
-    hasTransitions |= lineTranslateAnchor.calculate(parameters);
-    hasTransitions |= lineWidth.calculate(parameters);
-    hasTransitions |= lineGapWidth.calculate(parameters);
-    hasTransitions |= lineOffset.calculate(parameters);
-    hasTransitions |= lineBlur.calculate(parameters);
-    hasTransitions |= lineDasharray.calculate(parameters);
-    hasTransitions |= linePattern.calculate(parameters);
-
-    return hasTransitions;
-}
-
 } // namespace style
 } // namespace mbgl

src/mbgl/style/layers/line_layer_properties.hpp

@@ -9,35 +9,81 @@
 namespace mbgl {
 namespace style {
 
-class CascadeParameters;
-class CalculationParameters;
-
-class LineLayoutProperties {
-public:
-    void recalculate(const CalculationParameters&);
-
-    LayoutProperty<LineCapType> lineCap { LineCapType::Butt };
-    LayoutProperty<LineJoinType> lineJoin { LineJoinType::Miter };
-    LayoutProperty<float> lineMiterLimit { 2 };
-    LayoutProperty<float> lineRoundLimit { 1 };
+struct LineCap : LayoutProperty<LineCapType> {
+    static LineCapType defaultValue() { return LineCapType::Butt; }
 };
 
-class LinePaintProperties {
-public:
-    void cascade(const CascadeParameters&);
-    bool recalculate(const CalculationParameters&);
-
-    PaintProperty<float> lineOpacity { 1 };
-    PaintProperty<Color> lineColor { Color::black() };
-    PaintProperty<std::array<float, 2>> lineTranslate { {{ 0, 0 }} };
-    PaintProperty<TranslateAnchorType> lineTranslateAnchor { TranslateAnchorType::Map };
-    PaintProperty<float> lineWidth { 1 };
-    PaintProperty<float> lineGapWidth { 0 };
-    PaintProperty<float> lineOffset { 0 };
-    PaintProperty<float> lineBlur { 0 };
-    PaintProperty<std::vector<float>, CrossFadedPropertyEvaluator> lineDasharray { {  } };
-    PaintProperty<std::string, CrossFadedPropertyEvaluator> linePattern { "" };
+struct LineJoin : LayoutProperty<LineJoinType> {
+    static LineJoinType defaultValue() { return LineJoinType::Miter; }
 };
 
+struct LineMiterLimit : LayoutProperty<float> {
+    static float defaultValue() { return 2; }
+};
+
+struct LineRoundLimit : LayoutProperty<float> {
+    static float defaultValue() { return 1; }
+};
+
+struct LineOpacity : PaintProperty<float> {
+    static float defaultValue() { return 1; }
+};
+
+struct LineColor : PaintProperty<Color> {
+    static Color defaultValue() { return Color::black(); }
+};
+
+struct LineTranslate : PaintProperty<std::array<float, 2>> {
+    static std::array<float, 2> defaultValue() { return {{ 0, 0 }}; }
+};
+
+struct LineTranslateAnchor : PaintProperty<TranslateAnchorType> {
+    static TranslateAnchorType defaultValue() { return TranslateAnchorType::Map; }
+};
+
+struct LineWidth : PaintProperty<float> {
+    static float defaultValue() { return 1; }
+};
+
+struct LineGapWidth : PaintProperty<float> {
+    static float defaultValue() { return 0; }
+};
+
+struct LineOffset : PaintProperty<float> {
+    static float defaultValue() { return 0; }
+};
+
+struct LineBlur : PaintProperty<float> {
+    static float defaultValue() { return 0; }
+};
+
+struct LineDasharray : CrossFadedPaintProperty<std::vector<float>> {
+    static std::vector<float> defaultValue() { return {  }; }
+};
+
+struct LinePattern : CrossFadedPaintProperty<std::string> {
+    static std::string defaultValue() { return ""; }
+};
+
+class LineLayoutProperties : public LayoutProperties<
+    LineCap,
+    LineJoin,
+    LineMiterLimit,
+    LineRoundLimit
+> {};
+
+class LinePaintProperties : public PaintProperties<
+    LineOpacity,
+    LineColor,
+    LineTranslate,
+    LineTranslateAnchor,
+    LineWidth,
+    LineGapWidth,
+    LineOffset,
+    LineBlur,
+    LineDasharray,
+    LinePattern
+> {};
+
 } // namespace style
 } // namespace mbgl

src/mbgl/style/layers/raster_layer.cpp

@@ -49,13 +49,13 @@ PropertyValue<float> RasterLayer::getDefaultRasterOpacity() {
 }
 
 PropertyValue<float> RasterLayer::getRasterOpacity(const optional<std::string>& klass) const {
-    return impl->paint.rasterOpacity.get(klass);
+    return impl->paint.get<RasterOpacity>(klass);
 }
 
 void RasterLayer::setRasterOpacity(PropertyValue<float> value, const optional<std::string>& klass) {
     if (value == getRasterOpacity(klass))
         return;
-    impl->paint.rasterOpacity.set(value, klass);
+    impl->paint.set<RasterOpacity>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -64,13 +64,13 @@ PropertyValue<float> RasterLayer::getDefaultRasterHueRotate() {
 }
 
 PropertyValue<float> RasterLayer::getRasterHueRotate(const optional<std::string>& klass) const {
-    return impl->paint.rasterHueRotate.get(klass);
+    return impl->paint.get<RasterHueRotate>(klass);
 }
 
 void RasterLayer::setRasterHueRotate(PropertyValue<float> value, const optional<std::string>& klass) {
     if (value == getRasterHueRotate(klass))
         return;
-    impl->paint.rasterHueRotate.set(value, klass);
+    impl->paint.set<RasterHueRotate>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -79,13 +79,13 @@ PropertyValue<float> RasterLayer::getDefaultRasterBrightnessMin() {
 }
 
 PropertyValue<float> RasterLayer::getRasterBrightnessMin(const optional<std::string>& klass) const {
-    return impl->paint.rasterBrightnessMin.get(klass);
+    return impl->paint.get<RasterBrightnessMin>(klass);
 }
 
 void RasterLayer::setRasterBrightnessMin(PropertyValue<float> value, const optional<std::string>& klass) {
     if (value == getRasterBrightnessMin(klass))
         return;
-    impl->paint.rasterBrightnessMin.set(value, klass);
+    impl->paint.set<RasterBrightnessMin>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -94,13 +94,13 @@ PropertyValue<float> RasterLayer::getDefaultRasterBrightnessMax() {
 }
 
 PropertyValue<float> RasterLayer::getRasterBrightnessMax(const optional<std::string>& klass) const {
-    return impl->paint.rasterBrightnessMax.get(klass);
+    return impl->paint.get<RasterBrightnessMax>(klass);
 }
 
 void RasterLayer::setRasterBrightnessMax(PropertyValue<float> value, const optional<std::string>& klass) {
     if (value == getRasterBrightnessMax(klass))
         return;
-    impl->paint.rasterBrightnessMax.set(value, klass);
+    impl->paint.set<RasterBrightnessMax>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -109,13 +109,13 @@ PropertyValue<float> RasterLayer::getDefaultRasterSaturation() {
 }
 
 PropertyValue<float> RasterLayer::getRasterSaturation(const optional<std::string>& klass) const {
-    return impl->paint.rasterSaturation.get(klass);
+    return impl->paint.get<RasterSaturation>(klass);
 }
 
 void RasterLayer::setRasterSaturation(PropertyValue<float> value, const optional<std::string>& klass) {
     if (value == getRasterSaturation(klass))
         return;
-    impl->paint.rasterSaturation.set(value, klass);
+    impl->paint.set<RasterSaturation>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -124,13 +124,13 @@ PropertyValue<float> RasterLayer::getDefaultRasterContrast() {
 }
 
 PropertyValue<float> RasterLayer::getRasterContrast(const optional<std::string>& klass) const {
-    return impl->paint.rasterContrast.get(klass);
+    return impl->paint.get<RasterContrast>(klass);
 }
 
 void RasterLayer::setRasterContrast(PropertyValue<float> value, const optional<std::string>& klass) {
     if (value == getRasterContrast(klass))
         return;
-    impl->paint.rasterContrast.set(value, klass);
+    impl->paint.set<RasterContrast>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -139,13 +139,13 @@ PropertyValue<float> RasterLayer::getDefaultRasterFadeDuration() {
 }
 
 PropertyValue<float> RasterLayer::getRasterFadeDuration(const optional<std::string>& klass) const {
-    return impl->paint.rasterFadeDuration.get(klass);
+    return impl->paint.get<RasterFadeDuration>(klass);
 }
 
 void RasterLayer::setRasterFadeDuration(PropertyValue<float> value, const optional<std::string>& klass) {
     if (value == getRasterFadeDuration(klass))
         return;
-    impl->paint.rasterFadeDuration.set(value, klass);
+    impl->paint.set<RasterFadeDuration>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 

src/mbgl/style/layers/raster_layer_impl.cpp

@@ -8,12 +8,12 @@ void RasterLayer::Impl::cascade(const CascadeParameters& parameters) {
     paint.cascade(parameters);
 }
 
-bool RasterLayer::Impl::recalculate(const CalculationParameters& parameters) {
-    bool hasTransitions = paint.recalculate(parameters);
+bool RasterLayer::Impl::evaluate(const PropertyEvaluationParameters& parameters) {
+    paint.evaluate(parameters);
 
-    passes = paint.rasterOpacity > 0 ? RenderPass::Translucent : RenderPass::None;
+    passes = paint.evaluated.get<RasterOpacity>() > 0 ? RenderPass::Translucent : RenderPass::None;
 
-    return hasTransitions;
+    return paint.hasTransition();
 }
 
 std::unique_ptr<Bucket> RasterLayer::Impl::createBucket(BucketParameters&) const {

src/mbgl/style/layers/raster_layer_impl.hpp

@@ -13,7 +13,7 @@ public:
     std::unique_ptr<Layer> cloneRef(const std::string& id) const override;
 
     void cascade(const CascadeParameters&) override;
-    bool recalculate(const CalculationParameters&) override;
+    bool evaluate(const PropertyEvaluationParameters&) override;
 
     std::unique_ptr<Bucket> createBucket(BucketParameters&) const override;
 

src/mbgl/style/layers/raster_layer_properties.cpp

@@ -5,29 +5,5 @@
 namespace mbgl {
 namespace style {
 
-void RasterPaintProperties::cascade(const CascadeParameters& parameters) {
-    rasterOpacity.cascade(parameters);
-    rasterHueRotate.cascade(parameters);
-    rasterBrightnessMin.cascade(parameters);
-    rasterBrightnessMax.cascade(parameters);
-    rasterSaturation.cascade(parameters);
-    rasterContrast.cascade(parameters);
-    rasterFadeDuration.cascade(parameters);
-}
-
-bool RasterPaintProperties::recalculate(const CalculationParameters& parameters) {
-    bool hasTransitions = false;
-
-    hasTransitions |= rasterOpacity.calculate(parameters);
-    hasTransitions |= rasterHueRotate.calculate(parameters);
-    hasTransitions |= rasterBrightnessMin.calculate(parameters);
-    hasTransitions |= rasterBrightnessMax.calculate(parameters);
-    hasTransitions |= rasterSaturation.calculate(parameters);
-    hasTransitions |= rasterContrast.calculate(parameters);
-    hasTransitions |= rasterFadeDuration.calculate(parameters);
-
-    return hasTransitions;
-}
-
 } // namespace style
 } // namespace mbgl

src/mbgl/style/layers/raster_layer_properties.hpp

@@ -9,22 +9,43 @@
 namespace mbgl {
 namespace style {
 
-class CascadeParameters;
-class CalculationParameters;
-
-class RasterPaintProperties {
-public:
-    void cascade(const CascadeParameters&);
-    bool recalculate(const CalculationParameters&);
-
-    PaintProperty<float> rasterOpacity { 1 };
-    PaintProperty<float> rasterHueRotate { 0 };
-    PaintProperty<float> rasterBrightnessMin { 0 };
-    PaintProperty<float> rasterBrightnessMax { 1 };
-    PaintProperty<float> rasterSaturation { 0 };
-    PaintProperty<float> rasterContrast { 0 };
-    PaintProperty<float> rasterFadeDuration { 300 };
+struct RasterOpacity : PaintProperty<float> {
+    static float defaultValue() { return 1; }
 };
 
+struct RasterHueRotate : PaintProperty<float> {
+    static float defaultValue() { return 0; }
+};
+
+struct RasterBrightnessMin : PaintProperty<float> {
+    static float defaultValue() { return 0; }
+};
+
+struct RasterBrightnessMax : PaintProperty<float> {
+    static float defaultValue() { return 1; }
+};
+
+struct RasterSaturation : PaintProperty<float> {
+    static float defaultValue() { return 0; }
+};
+
+struct RasterContrast : PaintProperty<float> {
+    static float defaultValue() { return 0; }
+};
+
+struct RasterFadeDuration : PaintProperty<float> {
+    static float defaultValue() { return 300; }
+};
+
+class RasterPaintProperties : public PaintProperties<
+    RasterOpacity,
+    RasterHueRotate,
+    RasterBrightnessMin,
+    RasterBrightnessMax,
+    RasterSaturation,
+    RasterContrast,
+    RasterFadeDuration
+> {};
+
 } // namespace style
 } // namespace mbgl

src/mbgl/style/layers/symbol_layer.cpp

@@ -60,479 +60,479 @@ const Filter& SymbolLayer::getFilter() const {
 // Layout properties
 
 PropertyValue<SymbolPlacementType> SymbolLayer::getDefaultSymbolPlacement() {
-    return { SymbolPlacementType::Point };
+    return SymbolPlacement::defaultValue();
 }
 
 PropertyValue<SymbolPlacementType> SymbolLayer::getSymbolPlacement() const {
-    return impl->layout.symbolPlacement.get();
+    return impl->layout.unevaluated.get<SymbolPlacement>();
 }
 
 void SymbolLayer::setSymbolPlacement(PropertyValue<SymbolPlacementType> value) {
     if (value == getSymbolPlacement())
         return;
-    impl->layout.symbolPlacement.set(value);
+    impl->layout.unevaluated.get<SymbolPlacement>() = value;
     impl->observer->onLayerLayoutPropertyChanged(*this, "symbol-placement");
 }
 PropertyValue<float> SymbolLayer::getDefaultSymbolSpacing() {
-    return { 250 };
+    return SymbolSpacing::defaultValue();
 }
 
 PropertyValue<float> SymbolLayer::getSymbolSpacing() const {
-    return impl->layout.symbolSpacing.get();
+    return impl->layout.unevaluated.get<SymbolSpacing>();
 }
 
 void SymbolLayer::setSymbolSpacing(PropertyValue<float> value) {
     if (value == getSymbolSpacing())
         return;
-    impl->layout.symbolSpacing.set(value);
+    impl->layout.unevaluated.get<SymbolSpacing>() = value;
     impl->observer->onLayerLayoutPropertyChanged(*this, "symbol-spacing");
 }
 PropertyValue<bool> SymbolLayer::getDefaultSymbolAvoidEdges() {
-    return { false };
+    return SymbolAvoidEdges::defaultValue();
 }
 
 PropertyValue<bool> SymbolLayer::getSymbolAvoidEdges() const {
-    return impl->layout.symbolAvoidEdges.get();
+    return impl->layout.unevaluated.get<SymbolAvoidEdges>();
 }
 
 void SymbolLayer::setSymbolAvoidEdges(PropertyValue<bool> value) {
     if (value == getSymbolAvoidEdges())
         return;
-    impl->layout.symbolAvoidEdges.set(value);
+    impl->layout.unevaluated.get<SymbolAvoidEdges>() = value;
     impl->observer->onLayerLayoutPropertyChanged(*this, "symbol-avoid-edges");
 }
 PropertyValue<bool> SymbolLayer::getDefaultIconAllowOverlap() {
-    return { false };
+    return IconAllowOverlap::defaultValue();
 }
 
 PropertyValue<bool> SymbolLayer::getIconAllowOverlap() const {
-    return impl->layout.iconAllowOverlap.get();
+    return impl->layout.unevaluated.get<IconAllowOverlap>();
 }
 
 void SymbolLayer::setIconAllowOverlap(PropertyValue<bool> value) {
     if (value == getIconAllowOverlap())
         return;
-    impl->layout.iconAllowOverlap.set(value);
+    impl->layout.unevaluated.get<IconAllowOverlap>() = value;
     impl->observer->onLayerLayoutPropertyChanged(*this, "icon-allow-overlap");
 }
 PropertyValue<bool> SymbolLayer::getDefaultIconIgnorePlacement() {
-    return { false };
+    return IconIgnorePlacement::defaultValue();
 }
 
 PropertyValue<bool> SymbolLayer::getIconIgnorePlacement() const {
-    return impl->layout.iconIgnorePlacement.get();
+    return impl->layout.unevaluated.get<IconIgnorePlacement>();
 }
 
 void SymbolLayer::setIconIgnorePlacement(PropertyValue<bool> value) {
     if (value == getIconIgnorePlacement())
         return;
-    impl->layout.iconIgnorePlacement.set(value);
+    impl->layout.unevaluated.get<IconIgnorePlacement>() = value;
     impl->observer->onLayerLayoutPropertyChanged(*this, "icon-ignore-placement");
 }
 PropertyValue<bool> SymbolLayer::getDefaultIconOptional() {
-    return { false };
+    return IconOptional::defaultValue();
 }
 
 PropertyValue<bool> SymbolLayer::getIconOptional() const {
-    return impl->layout.iconOptional.get();
+    return impl->layout.unevaluated.get<IconOptional>();
 }
 
 void SymbolLayer::setIconOptional(PropertyValue<bool> value) {
     if (value == getIconOptional())
         return;
-    impl->layout.iconOptional.set(value);
+    impl->layout.unevaluated.get<IconOptional>() = value;
     impl->observer->onLayerLayoutPropertyChanged(*this, "icon-optional");
 }
 PropertyValue<AlignmentType> SymbolLayer::getDefaultIconRotationAlignment() {
-    return { AlignmentType::Auto };
+    return IconRotationAlignment::defaultValue();
 }
 
 PropertyValue<AlignmentType> SymbolLayer::getIconRotationAlignment() const {
-    return impl->layout.iconRotationAlignment.get();
+    return impl->layout.unevaluated.get<IconRotationAlignment>();
 }
 
 void SymbolLayer::setIconRotationAlignment(PropertyValue<AlignmentType> value) {
     if (value == getIconRotationAlignment())
         return;
-    impl->layout.iconRotationAlignment.set(value);
+    impl->layout.unevaluated.get<IconRotationAlignment>() = value;
     impl->observer->onLayerLayoutPropertyChanged(*this, "icon-rotation-alignment");
 }
 PropertyValue<float> SymbolLayer::getDefaultIconSize() {
-    return { 1 };
+    return IconSize::defaultValue();
 }
 
 PropertyValue<float> SymbolLayer::getIconSize() const {
-    return impl->layout.iconSize.get();
+    return impl->layout.unevaluated.get<IconSize>();
 }
 
 void SymbolLayer::setIconSize(PropertyValue<float> value) {
     if (value == getIconSize())
         return;
-    impl->layout.iconSize.set(value);
+    impl->layout.unevaluated.get<IconSize>() = value;
     impl->observer->onLayerLayoutPropertyChanged(*this, "icon-size");
 }
 PropertyValue<IconTextFitType> SymbolLayer::getDefaultIconTextFit() {
-    return { IconTextFitType::None };
+    return IconTextFit::defaultValue();
 }
 
 PropertyValue<IconTextFitType> SymbolLayer::getIconTextFit() const {
-    return impl->layout.iconTextFit.get();
+    return impl->layout.unevaluated.get<IconTextFit>();
 }
 
 void SymbolLayer::setIconTextFit(PropertyValue<IconTextFitType> value) {
     if (value == getIconTextFit())
         return;
-    impl->layout.iconTextFit.set(value);
+    impl->layout.unevaluated.get<IconTextFit>() = value;
     impl->observer->onLayerLayoutPropertyChanged(*this, "icon-text-fit");
 }
 PropertyValue<std::array<float, 4>> SymbolLayer::getDefaultIconTextFitPadding() {
-    return { {{ 0, 0, 0, 0 }} };
+    return IconTextFitPadding::defaultValue();
 }
 
 PropertyValue<std::array<float, 4>> SymbolLayer::getIconTextFitPadding() const {
-    return impl->layout.iconTextFitPadding.get();
+    return impl->layout.unevaluated.get<IconTextFitPadding>();
 }
 
 void SymbolLayer::setIconTextFitPadding(PropertyValue<std::array<float, 4>> value) {
     if (value == getIconTextFitPadding())
         return;
-    impl->layout.iconTextFitPadding.set(value);
+    impl->layout.unevaluated.get<IconTextFitPadding>() = value;
     impl->observer->onLayerLayoutPropertyChanged(*this, "icon-text-fit-padding");
 }
 PropertyValue<std::string> SymbolLayer::getDefaultIconImage() {
-    return { "" };
+    return IconImage::defaultValue();
 }
 
 PropertyValue<std::string> SymbolLayer::getIconImage() const {
-    return impl->layout.iconImage.get();
+    return impl->layout.unevaluated.get<IconImage>();
 }
 
 void SymbolLayer::setIconImage(PropertyValue<std::string> value) {
     if (value == getIconImage())
         return;
-    impl->layout.iconImage.set(value);
+    impl->layout.unevaluated.get<IconImage>() = value;
     impl->observer->onLayerLayoutPropertyChanged(*this, "icon-image");
 }
 PropertyValue<float> SymbolLayer::getDefaultIconRotate() {
-    return { 0 };
+    return IconRotate::defaultValue();
 }
 
 PropertyValue<float> SymbolLayer::getIconRotate() const {
-    return impl->layout.iconRotate.get();
+    return impl->layout.unevaluated.get<IconRotate>();
 }
 
 void SymbolLayer::setIconRotate(PropertyValue<float> value) {
     if (value == getIconRotate())
         return;
-    impl->layout.iconRotate.set(value);
+    impl->layout.unevaluated.get<IconRotate>() = value;
     impl->observer->onLayerLayoutPropertyChanged(*this, "icon-rotate");
 }
 PropertyValue<float> SymbolLayer::getDefaultIconPadding() {
-    return { 2 };
+    return IconPadding::defaultValue();
 }
 
 PropertyValue<float> SymbolLayer::getIconPadding() const {
-    return impl->layout.iconPadding.get();
+    return impl->layout.unevaluated.get<IconPadding>();
 }
 
 void SymbolLayer::setIconPadding(PropertyValue<float> value) {
     if (value == getIconPadding())
         return;
-    impl->layout.iconPadding.set(value);
+    impl->layout.unevaluated.get<IconPadding>() = value;
     impl->observer->onLayerLayoutPropertyChanged(*this, "icon-padding");
 }
 PropertyValue<bool> SymbolLayer::getDefaultIconKeepUpright() {
-    return { false };
+    return IconKeepUpright::defaultValue();
 }
 
 PropertyValue<bool> SymbolLayer::getIconKeepUpright() const {
-    return impl->layout.iconKeepUpright.get();
+    return impl->layout.unevaluated.get<IconKeepUpright>();
 }
 
 void SymbolLayer::setIconKeepUpright(PropertyValue<bool> value) {
     if (value == getIconKeepUpright())
         return;
-    impl->layout.iconKeepUpright.set(value);
+    impl->layout.unevaluated.get<IconKeepUpright>() = value;
     impl->observer->onLayerLayoutPropertyChanged(*this, "icon-keep-upright");
 }
 PropertyValue<std::array<float, 2>> SymbolLayer::getDefaultIconOffset() {
-    return { {{ 0, 0 }} };
+    return IconOffset::defaultValue();
 }
 
 PropertyValue<std::array<float, 2>> SymbolLayer::getIconOffset() const {
-    return impl->layout.iconOffset.get();
+    return impl->layout.unevaluated.get<IconOffset>();
 }
 
 void SymbolLayer::setIconOffset(PropertyValue<std::array<float, 2>> value) {
     if (value == getIconOffset())
         return;
-    impl->layout.iconOffset.set(value);
+    impl->layout.unevaluated.get<IconOffset>() = value;
     impl->observer->onLayerLayoutPropertyChanged(*this, "icon-offset");
 }
 PropertyValue<AlignmentType> SymbolLayer::getDefaultTextPitchAlignment() {
-    return { AlignmentType::Auto };
+    return TextPitchAlignment::defaultValue();
 }
 
 PropertyValue<AlignmentType> SymbolLayer::getTextPitchAlignment() const {
-    return impl->layout.textPitchAlignment.get();
+    return impl->layout.unevaluated.get<TextPitchAlignment>();
 }
 
 void SymbolLayer::setTextPitchAlignment(PropertyValue<AlignmentType> value) {
     if (value == getTextPitchAlignment())
         return;
-    impl->layout.textPitchAlignment.set(value);
+    impl->layout.unevaluated.get<TextPitchAlignment>() = value;
     impl->observer->onLayerLayoutPropertyChanged(*this, "text-pitch-alignment");
 }
 PropertyValue<AlignmentType> SymbolLayer::getDefaultTextRotationAlignment() {
-    return { AlignmentType::Auto };
+    return TextRotationAlignment::defaultValue();
 }
 
 PropertyValue<AlignmentType> SymbolLayer::getTextRotationAlignment() const {
-    return impl->layout.textRotationAlignment.get();
+    return impl->layout.unevaluated.get<TextRotationAlignment>();
 }
 
 void SymbolLayer::setTextRotationAlignment(PropertyValue<AlignmentType> value) {
     if (value == getTextRotationAlignment())
         return;
-    impl->layout.textRotationAlignment.set(value);
+    impl->layout.unevaluated.get<TextRotationAlignment>() = value;
     impl->observer->onLayerLayoutPropertyChanged(*this, "text-rotation-alignment");
 }
 PropertyValue<std::string> SymbolLayer::getDefaultTextField() {
-    return { "" };
+    return TextField::defaultValue();
 }
 
 PropertyValue<std::string> SymbolLayer::getTextField() const {
-    return impl->layout.textField.get();
+    return impl->layout.unevaluated.get<TextField>();
 }
 
 void SymbolLayer::setTextField(PropertyValue<std::string> value) {
     if (value == getTextField())
         return;
-    impl->layout.textField.set(value);
+    impl->layout.unevaluated.get<TextField>() = value;
     impl->observer->onLayerLayoutPropertyChanged(*this, "text-field");
 }
 PropertyValue<std::vector<std::string>> SymbolLayer::getDefaultTextFont() {
-    return { { "Open Sans Regular", "Arial Unicode MS Regular" } };
+    return TextFont::defaultValue();
 }
 
 PropertyValue<std::vector<std::string>> SymbolLayer::getTextFont() const {
-    return impl->layout.textFont.get();
+    return impl->layout.unevaluated.get<TextFont>();
 }
 
 void SymbolLayer::setTextFont(PropertyValue<std::vector<std::string>> value) {
     if (value == getTextFont())
         return;
-    impl->layout.textFont.set(value);
+    impl->layout.unevaluated.get<TextFont>() = value;
     impl->observer->onLayerLayoutPropertyChanged(*this, "text-font");
 }
 PropertyValue<float> SymbolLayer::getDefaultTextSize() {
-    return { 16 };
+    return TextSize::defaultValue();
 }
 
 PropertyValue<float> SymbolLayer::getTextSize() const {
-    return impl->layout.textSize.get();
+    return impl->layout.unevaluated.get<TextSize>();
 }
 
 void SymbolLayer::setTextSize(PropertyValue<float> value) {
     if (value == getTextSize())
         return;
-    impl->layout.textSize.set(value);
+    impl->layout.unevaluated.get<TextSize>() = value;
     impl->observer->onLayerLayoutPropertyChanged(*this, "text-size");
 }
 PropertyValue<float> SymbolLayer::getDefaultTextMaxWidth() {
-    return { 10 };
+    return TextMaxWidth::defaultValue();
 }
 
 PropertyValue<float> SymbolLayer::getTextMaxWidth() const {
-    return impl->layout.textMaxWidth.get();
+    return impl->layout.unevaluated.get<TextMaxWidth>();
 }
 
 void SymbolLayer::setTextMaxWidth(PropertyValue<float> value) {
     if (value == getTextMaxWidth())
         return;
-    impl->layout.textMaxWidth.set(value);
+    impl->layout.unevaluated.get<TextMaxWidth>() = value;
     impl->observer->onLayerLayoutPropertyChanged(*this, "text-max-width");
 }
 PropertyValue<float> SymbolLayer::getDefaultTextLineHeight() {
-    return { 1.2 };
+    return TextLineHeight::defaultValue();
 }
 
 PropertyValue<float> SymbolLayer::getTextLineHeight() const {
-    return impl->layout.textLineHeight.get();
+    return impl->layout.unevaluated.get<TextLineHeight>();
 }
 
 void SymbolLayer::setTextLineHeight(PropertyValue<float> value) {
     if (value == getTextLineHeight())
         return;
-    impl->layout.textLineHeight.set(value);
+    impl->layout.unevaluated.get<TextLineHeight>() = value;
     impl->observer->onLayerLayoutPropertyChanged(*this, "text-line-height");
 }
 PropertyValue<float> SymbolLayer::getDefaultTextLetterSpacing() {
-    return { 0 };
+    return TextLetterSpacing::defaultValue();
 }
 
 PropertyValue<float> SymbolLayer::getTextLetterSpacing() const {
-    return impl->layout.textLetterSpacing.get();
+    return impl->layout.unevaluated.get<TextLetterSpacing>();
 }
 
 void SymbolLayer::setTextLetterSpacing(PropertyValue<float> value) {
     if (value == getTextLetterSpacing())
         return;
-    impl->layout.textLetterSpacing.set(value);
+    impl->layout.unevaluated.get<TextLetterSpacing>() = value;
     impl->observer->onLayerLayoutPropertyChanged(*this, "text-letter-spacing");
 }
 PropertyValue<TextJustifyType> SymbolLayer::getDefaultTextJustify() {
-    return { TextJustifyType::Center };
+    return TextJustify::defaultValue();
 }
 
 PropertyValue<TextJustifyType> SymbolLayer::getTextJustify() const {
-    return impl->layout.textJustify.get();
+    return impl->layout.unevaluated.get<TextJustify>();
 }
 
 void SymbolLayer::setTextJustify(PropertyValue<TextJustifyType> value) {
     if (value == getTextJustify())
         return;
-    impl->layout.textJustify.set(value);
+    impl->layout.unevaluated.get<TextJustify>() = value;
     impl->observer->onLayerLayoutPropertyChanged(*this, "text-justify");
 }
 PropertyValue<TextAnchorType> SymbolLayer::getDefaultTextAnchor() {
-    return { TextAnchorType::Center };
+    return TextAnchor::defaultValue();
 }
 
 PropertyValue<TextAnchorType> SymbolLayer::getTextAnchor() const {
-    return impl->layout.textAnchor.get();
+    return impl->layout.unevaluated.get<TextAnchor>();
 }
 
 void SymbolLayer::setTextAnchor(PropertyValue<TextAnchorType> value) {
     if (value == getTextAnchor())
         return;
-    impl->layout.textAnchor.set(value);
+    impl->layout.unevaluated.get<TextAnchor>() = value;
     impl->observer->onLayerLayoutPropertyChanged(*this, "text-anchor");
 }
 PropertyValue<float> SymbolLayer::getDefaultTextMaxAngle() {
-    return { 45 };
+    return TextMaxAngle::defaultValue();
 }
 
 PropertyValue<float> SymbolLayer::getTextMaxAngle() const {
-    return impl->layout.textMaxAngle.get();
+    return impl->layout.unevaluated.get<TextMaxAngle>();
 }
 
 void SymbolLayer::setTextMaxAngle(PropertyValue<float> value) {
     if (value == getTextMaxAngle())
         return;
-    impl->layout.textMaxAngle.set(value);
+    impl->layout.unevaluated.get<TextMaxAngle>() = value;
     impl->observer->onLayerLayoutPropertyChanged(*this, "text-max-angle");
 }
 PropertyValue<float> SymbolLayer::getDefaultTextRotate() {
-    return { 0 };
+    return TextRotate::defaultValue();
 }
 
 PropertyValue<float> SymbolLayer::getTextRotate() const {
-    return impl->layout.textRotate.get();
+    return impl->layout.unevaluated.get<TextRotate>();
 }
 
 void SymbolLayer::setTextRotate(PropertyValue<float> value) {
     if (value == getTextRotate())
         return;
-    impl->layout.textRotate.set(value);
+    impl->layout.unevaluated.get<TextRotate>() = value;
     impl->observer->onLayerLayoutPropertyChanged(*this, "text-rotate");
 }
 PropertyValue<float> SymbolLayer::getDefaultTextPadding() {
-    return { 2 };
+    return TextPadding::defaultValue();
 }
 
 PropertyValue<float> SymbolLayer::getTextPadding() const {
-    return impl->layout.textPadding.get();
+    return impl->layout.unevaluated.get<TextPadding>();
 }
 
 void SymbolLayer::setTextPadding(PropertyValue<float> value) {
     if (value == getTextPadding())
         return;
-    impl->layout.textPadding.set(value);
+    impl->layout.unevaluated.get<TextPadding>() = value;
     impl->observer->onLayerLayoutPropertyChanged(*this, "text-padding");
 }
 PropertyValue<bool> SymbolLayer::getDefaultTextKeepUpright() {
-    return { true };
+    return TextKeepUpright::defaultValue();
 }
 
 PropertyValue<bool> SymbolLayer::getTextKeepUpright() const {
-    return impl->layout.textKeepUpright.get();
+    return impl->layout.unevaluated.get<TextKeepUpright>();
 }
 
 void SymbolLayer::setTextKeepUpright(PropertyValue<bool> value) {
     if (value == getTextKeepUpright())
         return;
-    impl->layout.textKeepUpright.set(value);
+    impl->layout.unevaluated.get<TextKeepUpright>() = value;
     impl->observer->onLayerLayoutPropertyChanged(*this, "text-keep-upright");
 }
 PropertyValue<TextTransformType> SymbolLayer::getDefaultTextTransform() {
-    return { TextTransformType::None };
+    return TextTransform::defaultValue();
 }
 
 PropertyValue<TextTransformType> SymbolLayer::getTextTransform() const {
-    return impl->layout.textTransform.get();
+    return impl->layout.unevaluated.get<TextTransform>();
 }
 
 void SymbolLayer::setTextTransform(PropertyValue<TextTransformType> value) {
     if (value == getTextTransform())
         return;
-    impl->layout.textTransform.set(value);
+    impl->layout.unevaluated.get<TextTransform>() = value;
     impl->observer->onLayerLayoutPropertyChanged(*this, "text-transform");
 }
 PropertyValue<std::array<float, 2>> SymbolLayer::getDefaultTextOffset() {
-    return { {{ 0, 0 }} };
+    return TextOffset::defaultValue();
 }
 
 PropertyValue<std::array<float, 2>> SymbolLayer::getTextOffset() const {
-    return impl->layout.textOffset.get();
+    return impl->layout.unevaluated.get<TextOffset>();
 }
 
 void SymbolLayer::setTextOffset(PropertyValue<std::array<float, 2>> value) {
     if (value == getTextOffset())
         return;
-    impl->layout.textOffset.set(value);
+    impl->layout.unevaluated.get<TextOffset>() = value;
     impl->observer->onLayerLayoutPropertyChanged(*this, "text-offset");
 }
 PropertyValue<bool> SymbolLayer::getDefaultTextAllowOverlap() {
-    return { false };
+    return TextAllowOverlap::defaultValue();
 }
 
 PropertyValue<bool> SymbolLayer::getTextAllowOverlap() const {
-    return impl->layout.textAllowOverlap.get();
+    return impl->layout.unevaluated.get<TextAllowOverlap>();
 }
 
 void SymbolLayer::setTextAllowOverlap(PropertyValue<bool> value) {
     if (value == getTextAllowOverlap())
         return;
-    impl->layout.textAllowOverlap.set(value);
+    impl->layout.unevaluated.get<TextAllowOverlap>() = value;
     impl->observer->onLayerLayoutPropertyChanged(*this, "text-allow-overlap");
 }
 PropertyValue<bool> SymbolLayer::getDefaultTextIgnorePlacement() {
-    return { false };
+    return TextIgnorePlacement::defaultValue();
 }
 
 PropertyValue<bool> SymbolLayer::getTextIgnorePlacement() const {
-    return impl->layout.textIgnorePlacement.get();
+    return impl->layout.unevaluated.get<TextIgnorePlacement>();
 }
 
 void SymbolLayer::setTextIgnorePlacement(PropertyValue<bool> value) {
     if (value == getTextIgnorePlacement())
         return;
-    impl->layout.textIgnorePlacement.set(value);
+    impl->layout.unevaluated.get<TextIgnorePlacement>() = value;
     impl->observer->onLayerLayoutPropertyChanged(*this, "text-ignore-placement");
 }
 PropertyValue<bool> SymbolLayer::getDefaultTextOptional() {
-    return { false };
+    return TextOptional::defaultValue();
 }
 
 PropertyValue<bool> SymbolLayer::getTextOptional() const {
-    return impl->layout.textOptional.get();
+    return impl->layout.unevaluated.get<TextOptional>();
 }
 
 void SymbolLayer::setTextOptional(PropertyValue<bool> value) {
     if (value == getTextOptional())
         return;
-    impl->layout.textOptional.set(value);
+    impl->layout.unevaluated.get<TextOptional>() = value;
     impl->observer->onLayerLayoutPropertyChanged(*this, "text-optional");
 }
 
@@ -543,13 +543,13 @@ PropertyValue<float> SymbolLayer::getDefaultIconOpacity() {
 }
 
 PropertyValue<float> SymbolLayer::getIconOpacity(const optional<std::string>& klass) const {
-    return impl->paint.iconOpacity.get(klass);
+    return impl->paint.get<IconOpacity>(klass);
 }
 
 void SymbolLayer::setIconOpacity(PropertyValue<float> value, const optional<std::string>& klass) {
     if (value == getIconOpacity(klass))
         return;
-    impl->paint.iconOpacity.set(value, klass);
+    impl->paint.set<IconOpacity>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -558,13 +558,13 @@ PropertyValue<Color> SymbolLayer::getDefaultIconColor() {
 }
 
 PropertyValue<Color> SymbolLayer::getIconColor(const optional<std::string>& klass) const {
-    return impl->paint.iconColor.get(klass);
+    return impl->paint.get<IconColor>(klass);
 }
 
 void SymbolLayer::setIconColor(PropertyValue<Color> value, const optional<std::string>& klass) {
     if (value == getIconColor(klass))
         return;
-    impl->paint.iconColor.set(value, klass);
+    impl->paint.set<IconColor>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -573,13 +573,13 @@ PropertyValue<Color> SymbolLayer::getDefaultIconHaloColor() {
 }
 
 PropertyValue<Color> SymbolLayer::getIconHaloColor(const optional<std::string>& klass) const {
-    return impl->paint.iconHaloColor.get(klass);
+    return impl->paint.get<IconHaloColor>(klass);
 }
 
 void SymbolLayer::setIconHaloColor(PropertyValue<Color> value, const optional<std::string>& klass) {
     if (value == getIconHaloColor(klass))
         return;
-    impl->paint.iconHaloColor.set(value, klass);
+    impl->paint.set<IconHaloColor>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -588,13 +588,13 @@ PropertyValue<float> SymbolLayer::getDefaultIconHaloWidth() {
 }
 
 PropertyValue<float> SymbolLayer::getIconHaloWidth(const optional<std::string>& klass) const {
-    return impl->paint.iconHaloWidth.get(klass);
+    return impl->paint.get<IconHaloWidth>(klass);
 }
 
 void SymbolLayer::setIconHaloWidth(PropertyValue<float> value, const optional<std::string>& klass) {
     if (value == getIconHaloWidth(klass))
         return;
-    impl->paint.iconHaloWidth.set(value, klass);
+    impl->paint.set<IconHaloWidth>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -603,13 +603,13 @@ PropertyValue<float> SymbolLayer::getDefaultIconHaloBlur() {
 }
 
 PropertyValue<float> SymbolLayer::getIconHaloBlur(const optional<std::string>& klass) const {
-    return impl->paint.iconHaloBlur.get(klass);
+    return impl->paint.get<IconHaloBlur>(klass);
 }
 
 void SymbolLayer::setIconHaloBlur(PropertyValue<float> value, const optional<std::string>& klass) {
     if (value == getIconHaloBlur(klass))
         return;
-    impl->paint.iconHaloBlur.set(value, klass);
+    impl->paint.set<IconHaloBlur>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -618,13 +618,13 @@ PropertyValue<std::array<float, 2>> SymbolLayer::getDefaultIconTranslate() {
 }
 
 PropertyValue<std::array<float, 2>> SymbolLayer::getIconTranslate(const optional<std::string>& klass) const {
-    return impl->paint.iconTranslate.get(klass);
+    return impl->paint.get<IconTranslate>(klass);
 }
 
 void SymbolLayer::setIconTranslate(PropertyValue<std::array<float, 2>> value, const optional<std::string>& klass) {
     if (value == getIconTranslate(klass))
         return;
-    impl->paint.iconTranslate.set(value, klass);
+    impl->paint.set<IconTranslate>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -633,13 +633,13 @@ PropertyValue<TranslateAnchorType> SymbolLayer::getDefaultIconTranslateAnchor()
 }
 
 PropertyValue<TranslateAnchorType> SymbolLayer::getIconTranslateAnchor(const optional<std::string>& klass) const {
-    return impl->paint.iconTranslateAnchor.get(klass);
+    return impl->paint.get<IconTranslateAnchor>(klass);
 }
 
 void SymbolLayer::setIconTranslateAnchor(PropertyValue<TranslateAnchorType> value, const optional<std::string>& klass) {
     if (value == getIconTranslateAnchor(klass))
         return;
-    impl->paint.iconTranslateAnchor.set(value, klass);
+    impl->paint.set<IconTranslateAnchor>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -648,13 +648,13 @@ PropertyValue<float> SymbolLayer::getDefaultTextOpacity() {
 }
 
 PropertyValue<float> SymbolLayer::getTextOpacity(const optional<std::string>& klass) const {
-    return impl->paint.textOpacity.get(klass);
+    return impl->paint.get<TextOpacity>(klass);
 }
 
 void SymbolLayer::setTextOpacity(PropertyValue<float> value, const optional<std::string>& klass) {
     if (value == getTextOpacity(klass))
         return;
-    impl->paint.textOpacity.set(value, klass);
+    impl->paint.set<TextOpacity>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -663,13 +663,13 @@ PropertyValue<Color> SymbolLayer::getDefaultTextColor() {
 }
 
 PropertyValue<Color> SymbolLayer::getTextColor(const optional<std::string>& klass) const {
-    return impl->paint.textColor.get(klass);
+    return impl->paint.get<TextColor>(klass);
 }
 
 void SymbolLayer::setTextColor(PropertyValue<Color> value, const optional<std::string>& klass) {
     if (value == getTextColor(klass))
         return;
-    impl->paint.textColor.set(value, klass);
+    impl->paint.set<TextColor>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -678,13 +678,13 @@ PropertyValue<Color> SymbolLayer::getDefaultTextHaloColor() {
 }
 
 PropertyValue<Color> SymbolLayer::getTextHaloColor(const optional<std::string>& klass) const {
-    return impl->paint.textHaloColor.get(klass);
+    return impl->paint.get<TextHaloColor>(klass);
 }
 
 void SymbolLayer::setTextHaloColor(PropertyValue<Color> value, const optional<std::string>& klass) {
     if (value == getTextHaloColor(klass))
         return;
-    impl->paint.textHaloColor.set(value, klass);
+    impl->paint.set<TextHaloColor>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -693,13 +693,13 @@ PropertyValue<float> SymbolLayer::getDefaultTextHaloWidth() {
 }
 
 PropertyValue<float> SymbolLayer::getTextHaloWidth(const optional<std::string>& klass) const {
-    return impl->paint.textHaloWidth.get(klass);
+    return impl->paint.get<TextHaloWidth>(klass);
 }
 
 void SymbolLayer::setTextHaloWidth(PropertyValue<float> value, const optional<std::string>& klass) {
     if (value == getTextHaloWidth(klass))
         return;
-    impl->paint.textHaloWidth.set(value, klass);
+    impl->paint.set<TextHaloWidth>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -708,13 +708,13 @@ PropertyValue<float> SymbolLayer::getDefaultTextHaloBlur() {
 }
 
 PropertyValue<float> SymbolLayer::getTextHaloBlur(const optional<std::string>& klass) const {
-    return impl->paint.textHaloBlur.get(klass);
+    return impl->paint.get<TextHaloBlur>(klass);
 }
 
 void SymbolLayer::setTextHaloBlur(PropertyValue<float> value, const optional<std::string>& klass) {
     if (value == getTextHaloBlur(klass))
         return;
-    impl->paint.textHaloBlur.set(value, klass);
+    impl->paint.set<TextHaloBlur>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -723,13 +723,13 @@ PropertyValue<std::array<float, 2>> SymbolLayer::getDefaultTextTranslate() {
 }
 
 PropertyValue<std::array<float, 2>> SymbolLayer::getTextTranslate(const optional<std::string>& klass) const {
-    return impl->paint.textTranslate.get(klass);
+    return impl->paint.get<TextTranslate>(klass);
 }
 
 void SymbolLayer::setTextTranslate(PropertyValue<std::array<float, 2>> value, const optional<std::string>& klass) {
     if (value == getTextTranslate(klass))
         return;
-    impl->paint.textTranslate.set(value, klass);
+    impl->paint.set<TextTranslate>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 
@@ -738,13 +738,13 @@ PropertyValue<TranslateAnchorType> SymbolLayer::getDefaultTextTranslateAnchor()
 }
 
 PropertyValue<TranslateAnchorType> SymbolLayer::getTextTranslateAnchor(const optional<std::string>& klass) const {
-    return impl->paint.textTranslateAnchor.get(klass);
+    return impl->paint.get<TextTranslateAnchor>(klass);
 }
 
 void SymbolLayer::setTextTranslateAnchor(PropertyValue<TranslateAnchorType> value, const optional<std::string>& klass) {
     if (value == getTextTranslateAnchor(klass))
         return;
-    impl->paint.textTranslateAnchor.set(value, klass);
+    impl->paint.set<TextTranslateAnchor>(value, klass);
     impl->observer->onLayerPaintPropertyChanged(*this);
 }
 

src/mbgl/style/layers/symbol_layer_impl.cpp

@@ -10,20 +10,18 @@ void SymbolLayer::Impl::cascade(const CascadeParameters& parameters) {
     paint.cascade(parameters);
 }
 
-bool SymbolLayer::Impl::recalculate(const CalculationParameters& parameters) {
-    bool hasTransitions = paint.recalculate(parameters);
+bool SymbolLayer::Impl::evaluate(const PropertyEvaluationParameters& parameters) {
+    paint.evaluate(parameters);
 
     // text-size and icon-size are layout properties but they also need to be evaluated as paint properties:
-    layout.iconSize.calculate(parameters);
-    layout.textSize.calculate(parameters);
-    iconSize = layout.iconSize;
-    textSize = layout.textSize;
+    iconSize = layout.evaluate<IconSize>(parameters);
+    textSize = layout.evaluate<TextSize>(parameters);
 
-    passes = ((paint.iconOpacity > 0 && (paint.iconColor.value.a > 0 || paint.iconHaloColor.value.a > 0) && iconSize > 0)
-           || (paint.textOpacity > 0 && (paint.textColor.value.a > 0 || paint.textHaloColor.value.a > 0) && textSize > 0))
+    passes = ((paint.evaluated.get<IconOpacity>() > 0 && (paint.evaluated.get<IconColor>().a > 0 || paint.evaluated.get<IconHaloColor>().a > 0) && iconSize > 0)
+           || (paint.evaluated.get<TextOpacity>() > 0 && (paint.evaluated.get<TextColor>().a > 0 || paint.evaluated.get<TextHaloColor>().a > 0) && textSize > 0))
         ? RenderPass::Translucent : RenderPass::None;
 
-    return hasTransitions;
+    return paint.hasTransition();
 }
 
 std::unique_ptr<Bucket> SymbolLayer::Impl::createBucket(BucketParameters&) const {
@@ -32,37 +30,34 @@ std::unique_ptr<Bucket> SymbolLayer::Impl::createBucket(BucketParameters&) const
 }
 
 std::unique_ptr<SymbolLayout> SymbolLayer::Impl::createLayout(BucketParameters& parameters) const {
-    SymbolLayoutProperties layoutProperties = layout;
+    PropertyEvaluationParameters p(parameters.tileID.overscaledZ);
+    SymbolLayoutProperties::Evaluated evaluated = layout.evaluate(p);
 
-    CalculationParameters p(parameters.tileID.overscaledZ);
-    layoutProperties.recalculate(p);
-
-    if (layoutProperties.iconRotationAlignment.value == AlignmentType::Auto) {
-        if (layoutProperties.symbolPlacement.value == SymbolPlacementType::Line) {
-            layoutProperties.iconRotationAlignment.value = AlignmentType::Map;
+    if (evaluated.get<IconRotationAlignment>() == AlignmentType::Auto) {
+        if (evaluated.get<SymbolPlacement>() == SymbolPlacementType::Line) {
+            evaluated.get<IconRotationAlignment>() = AlignmentType::Map;
         } else {
-            layoutProperties.iconRotationAlignment.value = AlignmentType::Viewport;
+            evaluated.get<IconRotationAlignment>() = AlignmentType::Viewport;
         }
     }
 
-    if (layoutProperties.textRotationAlignment.value == AlignmentType::Auto) {
-        if (layoutProperties.symbolPlacement.value == SymbolPlacementType::Line) {
-            layoutProperties.textRotationAlignment.value = AlignmentType::Map;
+    if (evaluated.get<TextRotationAlignment>() == AlignmentType::Auto) {
+        if (evaluated.get<SymbolPlacement>() == SymbolPlacementType::Line) {
+            evaluated.get<TextRotationAlignment>() = AlignmentType::Map;
         } else {
-            layoutProperties.textRotationAlignment.value = AlignmentType::Viewport;
+            evaluated.get<TextRotationAlignment>() = AlignmentType::Viewport;
         }
     }
 
     // If unspecified `text-pitch-alignment` inherits `text-rotation-alignment`
-    if (layoutProperties.textPitchAlignment.value == AlignmentType::Auto) {
-        layoutProperties.textPitchAlignment.value = layoutProperties.textRotationAlignment.value;
+    if (evaluated.get<TextPitchAlignment>() == AlignmentType::Auto) {
+        evaluated.get<TextPitchAlignment>() = evaluated.get<TextRotationAlignment>();
     }
 
-    layoutProperties.textSize.calculate(CalculationParameters(18));
-    float textMaxSize = layoutProperties.textSize;
+    float textMaxSize = layout.evaluate<TextSize>(PropertyEvaluationParameters(18));
 
-    layoutProperties.iconSize.calculate(CalculationParameters(p.z + 1));
-    layoutProperties.textSize.calculate(CalculationParameters(p.z + 1));
+    evaluated.get<IconSize>() = layout.evaluate<IconSize>(PropertyEvaluationParameters(p.z + 1));
+    evaluated.get<TextSize>() = layout.evaluate<TextSize>(PropertyEvaluationParameters(p.z + 1));
 
     return std::make_unique<SymbolLayout>(id,
                                           parameters.layer.getName(),
@@ -71,40 +66,40 @@ std::unique_ptr<SymbolLayout> SymbolLayer::Impl::createLayout(BucketParameters&
                                           parameters.mode,
                                           parameters.layer,
                                           filter,
-                                          layoutProperties,
+                                          evaluated,
                                           textMaxSize,
                                           *spriteAtlas);
 }
 
-SymbolPropertyValues SymbolLayer::Impl::iconPropertyValues(const SymbolLayoutProperties& layout_) const {
+SymbolPropertyValues SymbolLayer::Impl::iconPropertyValues(const SymbolLayoutProperties::Evaluated& layout_) const {
     return SymbolPropertyValues {
-        layout_.iconRotationAlignment.value, // icon-pitch-alignment is not yet implemented; inherit the rotation alignment
-        layout_.iconRotationAlignment.value,
-        layout_.iconSize.value,
-        paint.iconOpacity.value,
-        paint.iconColor.value,
-        paint.iconHaloColor.value,
-        paint.iconHaloWidth.value,
-        paint.iconHaloBlur.value,
-        paint.iconTranslate.value,
-        paint.iconTranslateAnchor.value,
+        layout_.get<IconRotationAlignment>(), // icon-pitch-alignment is not yet implemented; inherit the rotation alignment
+        layout_.get<IconRotationAlignment>(),
+        layout_.get<IconSize>(),
+        paint.evaluated.get<IconOpacity>(),
+        paint.evaluated.get<IconColor>(),
+        paint.evaluated.get<IconHaloColor>(),
+        paint.evaluated.get<IconHaloWidth>(),
+        paint.evaluated.get<IconHaloBlur>(),
+        paint.evaluated.get<IconTranslate>(),
+        paint.evaluated.get<IconTranslateAnchor>(),
         iconSize,
         1.0f
     };
 }
 
-SymbolPropertyValues SymbolLayer::Impl::textPropertyValues(const SymbolLayoutProperties& layout_) const {
+SymbolPropertyValues SymbolLayer::Impl::textPropertyValues(const SymbolLayoutProperties::Evaluated& layout_) const {
     return SymbolPropertyValues {
-        layout_.textPitchAlignment.value,
-        layout_.textRotationAlignment.value,
-        layout_.textSize.value,
-        paint.textOpacity.value,
-        paint.textColor.value,
-        paint.textHaloColor.value,
-        paint.textHaloWidth.value,
-        paint.textHaloBlur.value,
-        paint.textTranslate.value,
-        paint.textTranslateAnchor.value,
+        layout_.get<TextPitchAlignment>(),
+        layout_.get<TextRotationAlignment>(),
+        layout_.get<TextSize>(),
+        paint.evaluated.get<TextOpacity>(),
+        paint.evaluated.get<TextColor>(),
+        paint.evaluated.get<TextHaloColor>(),
+        paint.evaluated.get<TextHaloWidth>(),
+        paint.evaluated.get<TextHaloBlur>(),
+        paint.evaluated.get<TextTranslate>(),
+        paint.evaluated.get<TextTranslateAnchor>(),
         textSize,
         24.0f
     };

src/mbgl/style/layers/symbol_layer_impl.hpp

@@ -47,13 +47,13 @@ public:
     std::unique_ptr<Layer> cloneRef(const std::string& id) const override;
 
     void cascade(const CascadeParameters&) override;
-    bool recalculate(const CalculationParameters&) override;
+    bool evaluate(const PropertyEvaluationParameters&) override;
 
     std::unique_ptr<Bucket> createBucket(BucketParameters&) const override;
     std::unique_ptr<SymbolLayout> createLayout(BucketParameters&) const;
 
-    SymbolPropertyValues iconPropertyValues(const SymbolLayoutProperties&) const;
-    SymbolPropertyValues textPropertyValues(const SymbolLayoutProperties&) const;
+    SymbolPropertyValues iconPropertyValues(const SymbolLayoutProperties::Evaluated&) const;
+    SymbolPropertyValues textPropertyValues(const SymbolLayoutProperties::Evaluated&) const;
 
     SymbolLayoutProperties layout;
     SymbolPaintProperties paint;

src/mbgl/style/layers/symbol_layer_properties.cpp

@@ -5,80 +5,5 @@
 namespace mbgl {
 namespace style {
 
-void SymbolLayoutProperties::recalculate(const CalculationParameters& parameters) {
-    symbolPlacement.calculate(parameters);
-    symbolSpacing.calculate(parameters);
-    symbolAvoidEdges.calculate(parameters);
-    iconAllowOverlap.calculate(parameters);
-    iconIgnorePlacement.calculate(parameters);
-    iconOptional.calculate(parameters);
-    iconRotationAlignment.calculate(parameters);
-    iconSize.calculate(parameters);
-    iconTextFit.calculate(parameters);
-    iconTextFitPadding.calculate(parameters);
-    iconImage.calculate(parameters);
-    iconRotate.calculate(parameters);
-    iconPadding.calculate(parameters);
-    iconKeepUpright.calculate(parameters);
-    iconOffset.calculate(parameters);
-    textPitchAlignment.calculate(parameters);
-    textRotationAlignment.calculate(parameters);
-    textField.calculate(parameters);
-    textFont.calculate(parameters);
-    textSize.calculate(parameters);
-    textMaxWidth.calculate(parameters);
-    textLineHeight.calculate(parameters);
-    textLetterSpacing.calculate(parameters);
-    textJustify.calculate(parameters);
-    textAnchor.calculate(parameters);
-    textMaxAngle.calculate(parameters);
-    textRotate.calculate(parameters);
-    textPadding.calculate(parameters);
-    textKeepUpright.calculate(parameters);
-    textTransform.calculate(parameters);
-    textOffset.calculate(parameters);
-    textAllowOverlap.calculate(parameters);
-    textIgnorePlacement.calculate(parameters);
-    textOptional.calculate(parameters);
-}
-
-void SymbolPaintProperties::cascade(const CascadeParameters& parameters) {
-    iconOpacity.cascade(parameters);
-    iconColor.cascade(parameters);
-    iconHaloColor.cascade(parameters);
-    iconHaloWidth.cascade(parameters);
-    iconHaloBlur.cascade(parameters);
-    iconTranslate.cascade(parameters);
-    iconTranslateAnchor.cascade(parameters);
-    textOpacity.cascade(parameters);
-    textColor.cascade(parameters);
-    textHaloColor.cascade(parameters);
-    textHaloWidth.cascade(parameters);
-    textHaloBlur.cascade(parameters);
-    textTranslate.cascade(parameters);
-    textTranslateAnchor.cascade(parameters);
-}
-
-bool SymbolPaintProperties::recalculate(const CalculationParameters& parameters) {
-    bool hasTransitions = false;
-
-    hasTransitions |= iconOpacity.calculate(parameters);
-    hasTransitions |= iconColor.calculate(parameters);
-    hasTransitions |= iconHaloColor.calculate(parameters);
-    hasTransitions |= iconHaloWidth.calculate(parameters);
-    hasTransitions |= iconHaloBlur.calculate(parameters);
-    hasTransitions |= iconTranslate.calculate(parameters);
-    hasTransitions |= iconTranslateAnchor.calculate(parameters);
-    hasTransitions |= textOpacity.calculate(parameters);
-    hasTransitions |= textColor.calculate(parameters);
-    hasTransitions |= textHaloColor.calculate(parameters);
-    hasTransitions |= textHaloWidth.calculate(parameters);
-    hasTransitions |= textHaloBlur.calculate(parameters);
-    hasTransitions |= textTranslate.calculate(parameters);
-    hasTransitions |= textTranslateAnchor.calculate(parameters);
-
-    return hasTransitions;
-}
-
 } // namespace style
 } // namespace mbgl

src/mbgl/style/layers/symbol_layer_properties.hpp

@@ -9,69 +9,251 @@
 namespace mbgl {
 namespace style {
 
-class CascadeParameters;
-class CalculationParameters;
-
-class SymbolLayoutProperties {
-public:
-    void recalculate(const CalculationParameters&);
-
-    LayoutProperty<SymbolPlacementType> symbolPlacement { SymbolPlacementType::Point };
-    LayoutProperty<float> symbolSpacing { 250 };
-    LayoutProperty<bool> symbolAvoidEdges { false };
-    LayoutProperty<bool> iconAllowOverlap { false };
-    LayoutProperty<bool> iconIgnorePlacement { false };
-    LayoutProperty<bool> iconOptional { false };
-    LayoutProperty<AlignmentType> iconRotationAlignment { AlignmentType::Auto };
-    LayoutProperty<float> iconSize { 1 };
-    LayoutProperty<IconTextFitType> iconTextFit { IconTextFitType::None };
-    LayoutProperty<std::array<float, 4>> iconTextFitPadding { {{ 0, 0, 0, 0 }} };
-    LayoutProperty<std::string> iconImage { "" };
-    LayoutProperty<float> iconRotate { 0 };
-    LayoutProperty<float> iconPadding { 2 };
-    LayoutProperty<bool> iconKeepUpright { false };
-    LayoutProperty<std::array<float, 2>> iconOffset { {{ 0, 0 }} };
-    LayoutProperty<AlignmentType> textPitchAlignment { AlignmentType::Auto };
-    LayoutProperty<AlignmentType> textRotationAlignment { AlignmentType::Auto };
-    LayoutProperty<std::string> textField { "" };
-    LayoutProperty<std::vector<std::string>> textFont { { "Open Sans Regular", "Arial Unicode MS Regular" } };
-    LayoutProperty<float> textSize { 16 };
-    LayoutProperty<float> textMaxWidth { 10 };
-    LayoutProperty<float> textLineHeight { 1.2 };
-    LayoutProperty<float> textLetterSpacing { 0 };
-    LayoutProperty<TextJustifyType> textJustify { TextJustifyType::Center };
-    LayoutProperty<TextAnchorType> textAnchor { TextAnchorType::Center };
-    LayoutProperty<float> textMaxAngle { 45 };
-    LayoutProperty<float> textRotate { 0 };
-    LayoutProperty<float> textPadding { 2 };
-    LayoutProperty<bool> textKeepUpright { true };
-    LayoutProperty<TextTransformType> textTransform { TextTransformType::None };
-    LayoutProperty<std::array<float, 2>> textOffset { {{ 0, 0 }} };
-    LayoutProperty<bool> textAllowOverlap { false };
-    LayoutProperty<bool> textIgnorePlacement { false };
-    LayoutProperty<bool> textOptional { false };
+struct SymbolPlacement : LayoutProperty<SymbolPlacementType> {
+    static SymbolPlacementType defaultValue() { return SymbolPlacementType::Point; }
 };
 
-class SymbolPaintProperties {
-public:
-    void cascade(const CascadeParameters&);
-    bool recalculate(const CalculationParameters&);
-
-    PaintProperty<float> iconOpacity { 1 };
-    PaintProperty<Color> iconColor { Color::black() };
-    PaintProperty<Color> iconHaloColor { {} };
-    PaintProperty<float> iconHaloWidth { 0 };
-    PaintProperty<float> iconHaloBlur { 0 };
-    PaintProperty<std::array<float, 2>> iconTranslate { {{ 0, 0 }} };
-    PaintProperty<TranslateAnchorType> iconTranslateAnchor { TranslateAnchorType::Map };
-    PaintProperty<float> textOpacity { 1 };
-    PaintProperty<Color> textColor { Color::black() };
-    PaintProperty<Color> textHaloColor { {} };
-    PaintProperty<float> textHaloWidth { 0 };
-    PaintProperty<float> textHaloBlur { 0 };
-    PaintProperty<std::array<float, 2>> textTranslate { {{ 0, 0 }} };
-    PaintProperty<TranslateAnchorType> textTranslateAnchor { TranslateAnchorType::Map };
+struct SymbolSpacing : LayoutProperty<float> {
+    static float defaultValue() { return 250; }
 };
 
+struct SymbolAvoidEdges : LayoutProperty<bool> {
+    static bool defaultValue() { return false; }
+};
+
+struct IconAllowOverlap : LayoutProperty<bool> {
+    static bool defaultValue() { return false; }
+};
+
+struct IconIgnorePlacement : LayoutProperty<bool> {
+    static bool defaultValue() { return false; }
+};
+
+struct IconOptional : LayoutProperty<bool> {
+    static bool defaultValue() { return false; }
+};
+
+struct IconRotationAlignment : LayoutProperty<AlignmentType> {
+    static AlignmentType defaultValue() { return AlignmentType::Auto; }
+};
+
+struct IconSize : LayoutProperty<float> {
+    static float defaultValue() { return 1; }
+};
+
+struct IconTextFit : LayoutProperty<IconTextFitType> {
+    static IconTextFitType defaultValue() { return IconTextFitType::None; }
+};
+
+struct IconTextFitPadding : LayoutProperty<std::array<float, 4>> {
+    static std::array<float, 4> defaultValue() { return {{ 0, 0, 0, 0 }}; }
+};
+
+struct IconImage : LayoutProperty<std::string> {
+    static std::string defaultValue() { return ""; }
+};
+
+struct IconRotate : LayoutProperty<float> {
+    static float defaultValue() { return 0; }
+};
+
+struct IconPadding : LayoutProperty<float> {
+    static float defaultValue() { return 2; }
+};
+
+struct IconKeepUpright : LayoutProperty<bool> {
+    static bool defaultValue() { return false; }
+};
+
+struct IconOffset : LayoutProperty<std::array<float, 2>> {
+    static std::array<float, 2> defaultValue() { return {{ 0, 0 }}; }
+};
+
+struct TextPitchAlignment : LayoutProperty<AlignmentType> {
+    static AlignmentType defaultValue() { return AlignmentType::Auto; }
+};
+
+struct TextRotationAlignment : LayoutProperty<AlignmentType> {
+    static AlignmentType defaultValue() { return AlignmentType::Auto; }
+};
+
+struct TextField : LayoutProperty<std::string> {
+    static std::string defaultValue() { return ""; }
+};
+
+struct TextFont : LayoutProperty<std::vector<std::string>> {
+    static std::vector<std::string> defaultValue() { return { "Open Sans Regular", "Arial Unicode MS Regular" }; }
+};
+
+struct TextSize : LayoutProperty<float> {
+    static float defaultValue() { return 16; }
+};
+
+struct TextMaxWidth : LayoutProperty<float> {
+    static float defaultValue() { return 10; }
+};
+
+struct TextLineHeight : LayoutProperty<float> {
+    static float defaultValue() { return 1.2; }
+};
+
+struct TextLetterSpacing : LayoutProperty<float> {
+    static float defaultValue() { return 0; }
+};
+
+struct TextJustify : LayoutProperty<TextJustifyType> {
+    static TextJustifyType defaultValue() { return TextJustifyType::Center; }
+};
+
+struct TextAnchor : LayoutProperty<TextAnchorType> {
+    static TextAnchorType defaultValue() { return TextAnchorType::Center; }
+};
+
+struct TextMaxAngle : LayoutProperty<float> {
+    static float defaultValue() { return 45; }
+};
+
+struct TextRotate : LayoutProperty<float> {
+    static float defaultValue() { return 0; }
+};
+
+struct TextPadding : LayoutProperty<float> {
+    static float defaultValue() { return 2; }
+};
+
+struct TextKeepUpright : LayoutProperty<bool> {
+    static bool defaultValue() { return true; }
+};
+
+struct TextTransform : LayoutProperty<TextTransformType> {
+    static TextTransformType defaultValue() { return TextTransformType::None; }
+};
+
+struct TextOffset : LayoutProperty<std::array<float, 2>> {
+    static std::array<float, 2> defaultValue() { return {{ 0, 0 }}; }
+};
+
+struct TextAllowOverlap : LayoutProperty<bool> {
+    static bool defaultValue() { return false; }
+};
+
+struct TextIgnorePlacement : LayoutProperty<bool> {
+    static bool defaultValue() { return false; }
+};
+
+struct TextOptional : LayoutProperty<bool> {
+    static bool defaultValue() { return false; }
+};
+
+struct IconOpacity : PaintProperty<float> {
+    static float defaultValue() { return 1; }
+};
+
+struct IconColor : PaintProperty<Color> {
+    static Color defaultValue() { return Color::black(); }
+};
+
+struct IconHaloColor : PaintProperty<Color> {
+    static Color defaultValue() { return {}; }
+};
+
+struct IconHaloWidth : PaintProperty<float> {
+    static float defaultValue() { return 0; }
+};
+
+struct IconHaloBlur : PaintProperty<float> {
+    static float defaultValue() { return 0; }
+};
+
+struct IconTranslate : PaintProperty<std::array<float, 2>> {
+    static std::array<float, 2> defaultValue() { return {{ 0, 0 }}; }
+};
+
+struct IconTranslateAnchor : PaintProperty<TranslateAnchorType> {
+    static TranslateAnchorType defaultValue() { return TranslateAnchorType::Map; }
+};
+
+struct TextOpacity : PaintProperty<float> {
+    static float defaultValue() { return 1; }
+};
+
+struct TextColor : PaintProperty<Color> {
+    static Color defaultValue() { return Color::black(); }
+};
+
+struct TextHaloColor : PaintProperty<Color> {
+    static Color defaultValue() { return {}; }
+};
+
+struct TextHaloWidth : PaintProperty<float> {
+    static float defaultValue() { return 0; }
+};
+
+struct TextHaloBlur : PaintProperty<float> {
+    static float defaultValue() { return 0; }
+};
+
+struct TextTranslate : PaintProperty<std::array<float, 2>> {
+    static std::array<float, 2> defaultValue() { return {{ 0, 0 }}; }
+};
+
+struct TextTranslateAnchor : PaintProperty<TranslateAnchorType> {
+    static TranslateAnchorType defaultValue() { return TranslateAnchorType::Map; }
+};
+
+class SymbolLayoutProperties : public LayoutProperties<
+    SymbolPlacement,
+    SymbolSpacing,
+    SymbolAvoidEdges,
+    IconAllowOverlap,
+    IconIgnorePlacement,
+    IconOptional,
+    IconRotationAlignment,
+    IconSize,
+    IconTextFit,
+    IconTextFitPadding,
+    IconImage,
+    IconRotate,
+    IconPadding,
+    IconKeepUpright,
+    IconOffset,
+    TextPitchAlignment,
+    TextRotationAlignment,
+    TextField,
+    TextFont,
+    TextSize,
+    TextMaxWidth,
+    TextLineHeight,
+    TextLetterSpacing,
+    TextJustify,
+    TextAnchor,
+    TextMaxAngle,
+    TextRotate,
+    TextPadding,
+    TextKeepUpright,
+    TextTransform,
+    TextOffset,
+    TextAllowOverlap,
+    TextIgnorePlacement,
+    TextOptional
+> {};
+
+class SymbolPaintProperties : public PaintProperties<
+    IconOpacity,
+    IconColor,
+    IconHaloColor,
+    IconHaloWidth,
+    IconHaloBlur,
+    IconTranslate,
+    IconTranslateAnchor,
+    TextOpacity,
+    TextColor,
+    TextHaloColor,
+    TextHaloWidth,
+    TextHaloBlur,
+    TextTranslate,
+    TextTranslateAnchor
+> {};
+
 } // namespace style
 } // namespace mbgl

src/mbgl/style/layout_property.hpp

@@ -1,43 +1,55 @@
 #pragma once
 
-#include <mbgl/style/property_value.hpp>
-#include <mbgl/style/property_parsing.hpp>
 #include <mbgl/style/property_evaluator.hpp>
-
-#include <utility>
+#include <mbgl/util/indexed_tuple.hpp>
 
 namespace mbgl {
 namespace style {
 
-template <typename T>
+class PropertyEvaluationParameters;
+
+template <class T>
 class LayoutProperty {
 public:
-    explicit LayoutProperty(T v)
-        : value(std::move(v)),
-          defaultValue(value) {}
+    using EvaluatorType = PropertyEvaluator<T>;
+    using UnevaluatedType = PropertyValue<T>;
+    using EvaluatedType = T;
+};
 
-    const PropertyValue<T>& get() const {
-        return currentValue;
+template <class... Ps>
+class LayoutProperties {
+public:
+    using Properties = TypeList<Ps...>;
+    using EvaluatedTypes = TypeList<typename Ps::EvaluatedType...>;
+    using UnevaluatedTypes = TypeList<typename Ps::UnevaluatedType...>;
+
+    template <class TypeList>
+    using Tuple = IndexedTuple<Properties, TypeList>;
+
+    class Evaluated : public Tuple<EvaluatedTypes> {
+    public:
+        using Tuple<EvaluatedTypes>::Tuple;
+    };
+
+    class Unevaluated : public Tuple<UnevaluatedTypes> {
+    public:
+        using Tuple<UnevaluatedTypes>::Tuple;
+    };
+
+    template <class P>
+    auto evaluate(const PropertyEvaluationParameters& parameters) const {
+        using Evaluator = typename P::EvaluatorType;
+        return unevaluated.template get<P>()
+            .evaluate(Evaluator(parameters, P::defaultValue()));
     }
 
-    void set(const PropertyValue<T>& value_) {
-        currentValue = value_;
+    Evaluated evaluate(const PropertyEvaluationParameters& parameters) const {
+        return Evaluated {
+            evaluate<Ps>(parameters)...
+        };
     }
 
-    void calculate(const CalculationParameters& parameters) {
-        if (currentValue) {
-            PropertyEvaluator<T> evaluator(parameters, defaultValue);
-            value = PropertyValue<T>::visit(currentValue, evaluator);
-        }
-    }
-
-    // TODO: remove / privatize
-    operator T() const { return value; }
-    T value;
-
-private:
-    T defaultValue;
-    PropertyValue<T> currentValue;
+    Unevaluated unevaluated;
 };
 
 } // namespace style

src/mbgl/style/paint_property.hpp

@@ -1,14 +1,14 @@
 #pragma once
 
 #include <mbgl/style/class_dictionary.hpp>
-#include <mbgl/style/property_parsing.hpp>
 #include <mbgl/style/property_evaluator.hpp>
 #include <mbgl/style/transition_options.hpp>
 #include <mbgl/style/cascade_parameters.hpp>
-#include <mbgl/style/calculation_parameters.hpp>
+#include <mbgl/style/property_evaluation_parameters.hpp>
 #include <mbgl/util/constants.hpp>
 #include <mbgl/util/interpolate.hpp>
-#include <mbgl/util/rapidjson.hpp>
+#include <mbgl/util/indexed_tuple.hpp>
+#include <mbgl/util/ignore.hpp>
 
 #include <unordered_map>
 #include <utility>
@@ -16,29 +16,59 @@
 namespace mbgl {
 namespace style {
 
-template <class T, template <class S> class Evaluator = PropertyEvaluator>
-class PaintProperty {
+template <class T, class Evaluator>
+class UnevaluatedPaintProperty {
 public:
-    using Result = typename Evaluator<T>::ResultType;
+    using Result = typename Evaluator::ResultType;
 
-    explicit PaintProperty(T defaultValue_)
-        : defaultValue(defaultValue_) {
-        values.emplace(ClassID::Fallback, defaultValue_);
+    UnevaluatedPaintProperty() = default;
+
+    UnevaluatedPaintProperty(PropertyValue<T> value_,
+                             UnevaluatedPaintProperty<T, Evaluator> prior_,
+                             TransitionOptions transition,
+                             TimePoint now)
+        : begin(now + transition.delay.value_or(Duration::zero())),
+          end(begin + transition.duration.value_or(Duration::zero())),
+          value(std::move(value_)) {
+        if (transition) {
+            prior = { std::move(prior_) };
+        }
     }
 
-    PaintProperty(const PaintProperty& other)
-        : defaultValue(other.defaultValue),
-          values(other.values),
-          transitions(other.transitions) {
+    Result evaluate(const PropertyEvaluationParameters& parameters, T defaultValue) {
+        Result finalValue = value.evaluate(Evaluator(parameters, defaultValue));
+        if (!prior) {
+            // No prior value.
+            return finalValue;
+        } else if (parameters.now >= end) {
+            // Transition from prior value is now complete.
+            prior = {};
+            return finalValue;
+        } else {
+            // Interpolate between recursively-calculated prior value and final.
+            float t = std::chrono::duration<float>(parameters.now - begin) / (end - begin);
+            return util::interpolate(prior->get().evaluate(parameters, defaultValue), finalValue, util::DEFAULT_TRANSITION_EASE.solve(t, 0.001));
+        }
     }
 
-    PaintProperty& operator=(const PaintProperty& other) {
-        defaultValue = other.defaultValue;
-        values = other.values;
-        transitions = other.transitions;
-        return *this;
+    bool hasTransition() const {
+        return bool(prior);
     }
 
+    bool isUndefined() const {
+        return value.isUndefined();
+    }
+
+private:
+    optional<mapbox::util::recursive_wrapper<UnevaluatedPaintProperty<T, Evaluator>>> prior;
+    TimePoint begin;
+    TimePoint end;
+    PropertyValue<T> value;
+};
+
+template <class T>
+class CascadingPaintProperty {
+public:
     bool isUndefined() const {
         return values.find(ClassID::Default) == values.end();
     }
@@ -57,82 +87,119 @@ public:
         transitions[klass ? ClassDictionary::Get().lookup(*klass) : ClassID::Default] = transition;
     }
 
-    void cascade(const CascadeParameters& params) {
-        const bool overrideTransition = !params.transition.delay && !params.transition.duration;
-        Duration delay = params.transition.delay.value_or(Duration::zero());
-        Duration duration = params.transition.duration.value_or(Duration::zero());
+    template <class UnevaluatedPaintProperty>
+    UnevaluatedPaintProperty cascade(const CascadeParameters& params, UnevaluatedPaintProperty prior) const {
+        TransitionOptions transition;
+        PropertyValue<T> value;
 
         for (const auto classID : params.classes) {
-            if (values.find(classID) == values.end())
-                continue;
-
-            if (overrideTransition && transitions.find(classID) != transitions.end()) {
-                const TransitionOptions& transition = transitions[classID];
-                if (transition.delay) delay = *transition.delay;
-                if (transition.duration) duration = *transition.duration;
+            if (values.find(classID) != values.end()) {
+                value = values.at(classID);
+                break;
             }
-
-            cascaded = std::make_unique<CascadedValue>(std::move(cascaded),
-                                                       params.now + delay,
-                                                       params.now + delay + duration,
-                                                       values.at(classID));
-
-            break;
         }
 
-        assert(cascaded);
-    }
+        for (const auto classID : params.classes) {
+            if (transitions.find(classID) != transitions.end()) {
+                transition = transitions.at(classID).reverseMerge(transition);
+                break;
+            }
+        }
 
-    bool calculate(const CalculationParameters& parameters) {
-        assert(cascaded);
-        Evaluator<T> evaluator(parameters, defaultValue);
-        value = cascaded->calculate(evaluator, parameters.now);
-        return cascaded->prior.operator bool();
+        return UnevaluatedPaintProperty(std::move(value),
+                                        std::move(prior),
+                                        transition.reverseMerge(params.transition),
+                                        params.now);
     }
 
-    // TODO: remove / privatize
-    operator T() const { return value; }
-    Result value;
-
 private:
-    T defaultValue;
     std::unordered_map<ClassID, PropertyValue<T>> values;
     std::unordered_map<ClassID, TransitionOptions> transitions;
+};
 
-    struct CascadedValue {
-        CascadedValue(std::unique_ptr<CascadedValue> prior_,
-                      TimePoint begin_,
-                      TimePoint end_,
-                      PropertyValue<T> value_)
-            : prior(std::move(prior_)),
-              begin(std::move(begin_)),
-              end(std::move(end_)),
-              value(std::move(value_)) {
-        }
+template <class T>
+class PaintProperty {
+public:
+    using ValueType = PropertyValue<T>;
+    using CascadingType = CascadingPaintProperty<T>;
+    using EvaluatorType = PropertyEvaluator<T>;
+    using UnevaluatedType = UnevaluatedPaintProperty<T, EvaluatorType>;
+    using EvaluatedType = T;
+};
 
-        Result calculate(const Evaluator<T>& evaluator, const TimePoint& now) {
-            Result finalValue = PropertyValue<T>::visit(value, evaluator);
-            if (!prior) {
-                // No prior value.
-                return finalValue;
-            } else if (now >= end) {
-                // Transition from prior value is now complete.
-                prior.reset();
-                return finalValue;
-            } else {
-                // Interpolate between recursively-calculated prior value and final.
-                float t = std::chrono::duration<float>(now - begin) / (end - begin);
-                return util::interpolate(prior->calculate(evaluator, now), finalValue, util::DEFAULT_TRANSITION_EASE.solve(t, 0.001));
-            }
-        }
+template <class T>
+class CrossFadedPaintProperty {
+public:
+    using ValueType = PropertyValue<T>;
+    using CascadingType = CascadingPaintProperty<T>;
+    using EvaluatorType = CrossFadedPropertyEvaluator<T>;
+    using UnevaluatedType = UnevaluatedPaintProperty<T, EvaluatorType>;
+    using EvaluatedType = Faded<T>;
+};
 
-        std::unique_ptr<CascadedValue> prior;
-        TimePoint begin;
-        TimePoint end;
-        PropertyValue<T> value;
+template <class... Ps>
+class PaintProperties {
+public:
+    using Properties = TypeList<Ps...>;
+    using EvaluatedTypes = TypeList<typename Ps::EvaluatedType...>;
+    using UnevaluatedTypes = TypeList<typename Ps::UnevaluatedType...>;
+    using CascadingTypes = TypeList<typename Ps::CascadingType...>;
+
+    template <class TypeList>
+    using Tuple = IndexedTuple<Properties, TypeList>;
+
+    class Evaluated : public Tuple<EvaluatedTypes> {
+    public:
+        using Tuple<EvaluatedTypes>::Tuple;
     };
 
-    std::unique_ptr<CascadedValue> cascaded;
+    class Unevaluated : public Tuple<UnevaluatedTypes> {
+    public:
+        using Tuple<UnevaluatedTypes>::Tuple;
+    };
+
+    class Cascading : public Tuple<CascadingTypes> {
+    public:
+        using Tuple<CascadingTypes>::Tuple;
+    };
+
+    template <class P>
+    auto get(const optional<std::string>& klass) const {
+        return cascading.template get<P>().get(klass);
+    }
+
+    template <class P>
+    void set(const typename P::ValueType& value, const optional<std::string>& klass) {
+        cascading.template get<P>().set(value, klass);
+    }
+
+    void cascade(const CascadeParameters& parameters) {
+        unevaluated = Unevaluated {
+            cascading.template get<Ps>().cascade(parameters,
+                std::move(unevaluated.template get<Ps>()))...
+        };
+    }
+
+    template <class P>
+    auto evaluate(const PropertyEvaluationParameters& parameters) {
+        return unevaluated.template get<P>().evaluate(parameters, P::defaultValue());
+    }
+
+    void evaluate(const PropertyEvaluationParameters& parameters) {
+        evaluated = Evaluated {
+            evaluate<Ps>(parameters)...
+        };
+    }
+
+    bool hasTransition() const {
+        bool result = false;
+        util::ignore({ result |= unevaluated.template get<Ps>().hasTransition()... });
+        return result;
+    }
+
+    Cascading cascading;
+    Unevaluated unevaluated;
+    Evaluated evaluated;
 };
 
 } // namespace style

src/mbgl/style/property_evaluation_parameters.hpp

@@ -6,12 +6,12 @@
 namespace mbgl {
 namespace style {
 
-class CalculationParameters {
+class PropertyEvaluationParameters {
 public:
-    explicit CalculationParameters(float z_)
+    explicit PropertyEvaluationParameters(float z_)
         : z(z_) {}
 
-    CalculationParameters(float z_,
+    PropertyEvaluationParameters(float z_,
                           TimePoint now_,
                           ZoomHistory zoomHistory_,
                           Duration defaultFadeDuration_)

src/mbgl/style/property_evaluator.cpp

@@ -1,5 +1,5 @@
 #include <mbgl/style/property_evaluator.hpp>
-#include <mbgl/style/calculation_parameters.hpp>
+#include <mbgl/style/property_evaluation_parameters.hpp>
 #include <mbgl/style/types.hpp>
 #include <mbgl/util/interpolate.hpp>
 #include <mbgl/util/chrono.hpp>

src/mbgl/style/property_evaluator.hpp

@@ -6,14 +6,14 @@
 namespace mbgl {
 namespace style {
 
-class CalculationParameters;
+class PropertyEvaluationParameters;
 
 template <typename T>
 class PropertyEvaluator {
 public:
     using ResultType = T;
 
-    PropertyEvaluator(const CalculationParameters& parameters_, T defaultValue_)
+    PropertyEvaluator(const PropertyEvaluationParameters& parameters_, T defaultValue_)
         : parameters(parameters_),
           defaultValue(std::move(defaultValue_)) {}
 
@@ -22,7 +22,7 @@ public:
     T operator()(const Function<T>&) const;
 
 private:
-    const CalculationParameters& parameters;
+    const PropertyEvaluationParameters& parameters;
     T defaultValue;
 };
 
@@ -41,7 +41,7 @@ class CrossFadedPropertyEvaluator {
 public:
     using ResultType = Faded<T>;
 
-    CrossFadedPropertyEvaluator(const CalculationParameters& parameters_, T defaultValue_)
+    CrossFadedPropertyEvaluator(const PropertyEvaluationParameters& parameters_, T defaultValue_)
         : parameters(parameters_),
           defaultValue(std::move(defaultValue_)) {}
 
@@ -52,7 +52,7 @@ public:
 private:
     Faded<T> calculate(const T& min, const T& mid, const T& max) const;
 
-    const CalculationParameters& parameters;
+    const PropertyEvaluationParameters& parameters;
     T defaultValue;
 };
 

src/mbgl/style/style.cpp

@@ -18,7 +18,7 @@
 #include <mbgl/style/class_dictionary.hpp>
 #include <mbgl/style/update_parameters.hpp>
 #include <mbgl/style/cascade_parameters.hpp>
-#include <mbgl/style/calculation_parameters.hpp>
+#include <mbgl/style/property_evaluation_parameters.hpp>
 #include <mbgl/sprite/sprite_atlas.hpp>
 #include <mbgl/text/glyph_atlas.hpp>
 #include <mbgl/geometry/line_atlas.hpp>
@@ -266,7 +266,6 @@ void Style::cascade(const TimePoint& timePoint, MapMode mode) {
         classIDs.push_back(ClassDictionary::Get().lookup(className));
     }
     classIDs.push_back(ClassID::Default);
-    classIDs.push_back(ClassID::Fallback);
 
     const CascadeParameters parameters {
         classIDs,
@@ -288,7 +287,7 @@ void Style::recalculate(float z, const TimePoint& timePoint, MapMode mode) {
 
     zoomHistory.update(z, timePoint);
 
-    const CalculationParameters parameters {
+    const PropertyEvaluationParameters parameters {
         z,
         mode == MapMode::Continuous ? timePoint : Clock::time_point::max(),
         zoomHistory,
@@ -297,7 +296,7 @@ void Style::recalculate(float z, const TimePoint& timePoint, MapMode mode) {
 
     hasPendingTransitions = false;
     for (const auto& layer : layers) {
-        const bool hasTransitions = layer->baseImpl->recalculate(parameters);
+        const bool hasTransitions = layer->baseImpl->evaluate(parameters);
 
         // Disable this layer if it doesn't need to be rendered.
         const bool needsRendering = layer->baseImpl->needsRendering(zoomHistory.lastZoom);
@@ -374,10 +373,10 @@ RenderData Style::getRenderData(MapDebugOptions debugOptions) const {
                 result.order.emplace_back(*layer);
                 continue;
             }
-            const BackgroundPaintProperties& paint = background->impl->paint;
-            if (layer.get() == layers[0].get() && paint.backgroundPattern.value.from.empty()) {
+            const BackgroundPaintProperties::Evaluated& paint = background->impl->paint.evaluated;
+            if (layer.get() == layers[0].get() && paint.get<BackgroundPattern>().from.empty()) {
                 // This is a solid background. We can use glClear().
-                result.backgroundColor = paint.backgroundColor * paint.backgroundOpacity;
+                result.backgroundColor = paint.get<BackgroundColor>() * paint.get<BackgroundOpacity>();
             } else {
                 // This is a textured background, or not the bottommost layer. We need to render it with a quad.
                 result.order.emplace_back(*layer);

src/mbgl/text/quads.cpp

@@ -14,7 +14,7 @@ using namespace style;
 const float globalMinScale = 0.5f; // underscale by 1 zoom level
 
 SymbolQuads getIconQuads(Anchor& anchor, const PositionedIcon& shapedIcon,
-        const GeometryCoordinates& line, const SymbolLayoutProperties& layout,
+        const GeometryCoordinates& line, const SymbolLayoutProperties::Evaluated& layout,
         const style::SymbolPlacementType placement, const Shaping& shapedText) {
 
     auto image = *(shapedIcon.image);
@@ -29,24 +29,24 @@ SymbolQuads getIconQuads(Anchor& anchor, const PositionedIcon& shapedIcon,
     Point<float> br;
     Point<float> bl;
 
-    if (layout.iconTextFit != IconTextFitType::None && shapedText) {
+    if (layout.get<IconTextFit>() != IconTextFitType::None && shapedText) {
         auto iconWidth = right - left;
         auto iconHeight = bottom - top;
-        auto size = layout.textSize / 24.0f;
+        auto size = layout.get<TextSize>() / 24.0f;
         auto textLeft = shapedText.left * size;
         auto textRight = shapedText.right * size;
         auto textTop = shapedText.top * size;
         auto textBottom = shapedText.bottom * size;
         auto textWidth = textRight - textLeft;
         auto textHeight = textBottom - textTop;;
-        auto padT = layout.iconTextFitPadding.value[0];
-        auto padR = layout.iconTextFitPadding.value[1];
-        auto padB = layout.iconTextFitPadding.value[2];
-        auto padL = layout.iconTextFitPadding.value[3];
-        auto offsetY = layout.iconTextFit == IconTextFitType::Width ? (textHeight - iconHeight) * 0.5 : 0;
-        auto offsetX = layout.iconTextFit == IconTextFitType::Height ? (textWidth - iconWidth) * 0.5 : 0;
-        auto width = layout.iconTextFit == IconTextFitType::Width || layout.iconTextFit == IconTextFitType::Both ? textWidth : iconWidth;
-        auto height = layout.iconTextFit == IconTextFitType::Height || layout.iconTextFit == IconTextFitType::Both ? textHeight : iconHeight;
+        auto padT = layout.get<IconTextFitPadding>()[0];
+        auto padR = layout.get<IconTextFitPadding>()[1];
+        auto padB = layout.get<IconTextFitPadding>()[2];
+        auto padL = layout.get<IconTextFitPadding>()[3];
+        auto offsetY = layout.get<IconTextFit>() == IconTextFitType::Width ? (textHeight - iconHeight) * 0.5 : 0;
+        auto offsetX = layout.get<IconTextFit>() == IconTextFitType::Height ? (textWidth - iconWidth) * 0.5 : 0;
+        auto width = layout.get<IconTextFit>() == IconTextFitType::Width || layout.get<IconTextFit>() == IconTextFitType::Both ? textWidth : iconWidth;
+        auto height = layout.get<IconTextFit>() == IconTextFitType::Height || layout.get<IconTextFit>() == IconTextFitType::Both ? textHeight : iconHeight;
         left = textLeft + offsetX - padL;
         top = textTop + offsetY - padT;
         right = textLeft + offsetX + padR + width;
@@ -62,7 +62,7 @@ SymbolQuads getIconQuads(Anchor& anchor, const PositionedIcon& shapedIcon,
         bl = {left, bottom};
     }
 
-    float angle = layout.iconRotate * util::DEG2RAD;
+    float angle = layout.get<IconRotate>() * util::DEG2RAD;
     if (placement == style::SymbolPlacementType::Line) {
         assert(static_cast<unsigned int>(anchor.segment) < line.size());
         const GeometryCoordinate &prev= line[anchor.segment];
@@ -165,11 +165,11 @@ void getSegmentGlyphs(std::back_insert_iterator<GlyphInstances> glyphs, Anchor &
 }
 
 SymbolQuads getGlyphQuads(Anchor& anchor, const Shaping& shapedText,
-        const float boxScale, const GeometryCoordinates& line, const SymbolLayoutProperties& layout,
+        const float boxScale, const GeometryCoordinates& line, const SymbolLayoutProperties::Evaluated& layout,
         const style::SymbolPlacementType placement, const GlyphPositions& face) {
 
-    const float textRotate = layout.textRotate * util::DEG2RAD;
-    const bool keepUpright = layout.textKeepUpright;
+    const float textRotate = layout.get<TextRotate>() * util::DEG2RAD;
+    const bool keepUpright = layout.get<TextKeepUpright>();
 
     SymbolQuads quads;
 

src/mbgl/text/quads.hpp

@@ -2,6 +2,7 @@
 
 #include <mbgl/text/glyph.hpp>
 #include <mbgl/style/types.hpp>
+#include <mbgl/style/layers/symbol_layer_properties.hpp>
 #include <mbgl/tile/geometry_tile_data.hpp>
 
 #include <vector>
@@ -11,10 +12,6 @@ namespace mbgl {
 struct Anchor;
 class PositionedIcon;
 
-namespace style {
-class SymbolLayoutProperties;
-} // namespace style
-
 struct SymbolQuad {
     explicit SymbolQuad(Point<float> tl_, Point<float> tr_, Point<float> bl_, Point<float> br_,
             Rect<uint16_t> tex_, float anchorAngle_, float glyphAngle_, Point<float> anchorPoint_,
@@ -40,11 +37,11 @@ struct SymbolQuad {
 typedef std::vector<SymbolQuad> SymbolQuads;
 
 SymbolQuads getIconQuads(Anchor& anchor, const PositionedIcon& shapedIcon,
-        const GeometryCoordinates& line, const style::SymbolLayoutProperties&,
+        const GeometryCoordinates& line, const style::SymbolLayoutProperties::Evaluated&,
         style::SymbolPlacementType placement, const Shaping& shapedText);
 
 SymbolQuads getGlyphQuads(Anchor& anchor, const Shaping& shapedText,
-        const float boxScale, const GeometryCoordinates& line, const style::SymbolLayoutProperties&,
+        const float boxScale, const GeometryCoordinates& line, const style::SymbolLayoutProperties::Evaluated&,
         style::SymbolPlacementType placement, const GlyphPositions& face);
 
 } // namespace mbgl

src/mbgl/text/shaping.cpp

@@ -3,9 +3,11 @@
 
 namespace mbgl {
 
-PositionedIcon shapeIcon(const SpriteAtlasElement& image, const style::SymbolLayoutProperties& layout) {
-    float dx = layout.iconOffset.value[0];
-    float dy = layout.iconOffset.value[1];
+using namespace style;
+
+PositionedIcon shapeIcon(const SpriteAtlasElement& image, const SymbolLayoutProperties::Evaluated& layout) {
+    float dx = layout.get<IconOffset>()[0];
+    float dy = layout.get<IconOffset>()[1];
     float x1 = dx - image.spriteImage->getWidth() / 2.0f;
     float x2 = x1 + image.spriteImage->getWidth();
     float y1 = dy - image.spriteImage->getHeight() / 2.0f;

src/mbgl/text/shaping.hpp

@@ -3,16 +3,13 @@
 #include <mbgl/text/glyph.hpp>
 #include <mbgl/sprite/sprite_atlas.hpp>
 #include <mbgl/sprite/sprite_image.hpp>
+#include <mbgl/style/layers/symbol_layer_properties.hpp>
 #include <mbgl/util/optional.hpp>
 
 namespace mbgl {
 
 class SpriteAtlasElement;
 
-namespace style {
-class SymbolLayoutProperties;
-} // namespace style
-
 class PositionedIcon {
     public:
         explicit PositionedIcon() {}
@@ -29,6 +26,6 @@ class PositionedIcon {
         explicit operator bool() const { return image && (*image).pos.hasArea(); }
 };
 
-PositionedIcon shapeIcon(const SpriteAtlasElement& image, const style::SymbolLayoutProperties&);
+PositionedIcon shapeIcon(const SpriteAtlasElement& image, const style::SymbolLayoutProperties::Evaluated&);
 
 } // namespace mbgl

test/gl/bucket.test.cpp

@@ -30,7 +30,7 @@ TEST(Buckets, LineBucket) {
 
 TEST(Buckets, SymbolBucket) {
     mbgl::MapMode mapMode = mbgl::MapMode::Still;
-    mbgl::style::SymbolLayoutProperties properties;
+    mbgl::style::SymbolLayoutProperties::Evaluated properties;
     bool sdfIcons = false;
     bool iconsNeedLinear = false;
 

test/style/functions.test.cpp

@@ -2,16 +2,16 @@
 #include <mbgl/test/util.hpp>
 
 #include <mbgl/style/property_evaluator.hpp>
-#include <mbgl/style/calculation_parameters.hpp>
+#include <mbgl/style/property_evaluation_parameters.hpp>
 
 using namespace mbgl;
 using namespace mbgl::style;
 
 float evaluate(PropertyValue<float> value, float zoom) {
-    return PropertyValue<float>::visit(value, PropertyEvaluator<float>(CalculationParameters(zoom), 0));
+    return value.evaluate(PropertyEvaluator<float>(PropertyEvaluationParameters(zoom), 0));
 }
 std::string evaluate(PropertyValue<std::string> value, float zoom) {
-    return PropertyValue<std::string>::visit(value, PropertyEvaluator<std::string>(CalculationParameters(zoom), ""));
+    return value.evaluate(PropertyEvaluator<std::string>(PropertyEvaluationParameters(zoom), ""));
 }
 
 TEST(Function, Constant) {

test/text/quads.test.cpp

@@ -10,7 +10,7 @@ using namespace mbgl;
 using namespace mbgl::style;
 
 TEST(getIconQuads, normal) {
-    SymbolLayoutProperties layout;
+    SymbolLayoutProperties::Evaluated layout;
     Anchor anchor(2.0, 3.0, 0.0, 0.5f, 0);
     SpriteAtlasElement image = {
         Rect<uint16_t>( 0, 0, 15, 11 ),
@@ -58,7 +58,7 @@ TEST(getIconQuads, style) {
 
     // none
     {
-        SymbolLayoutProperties layout;
+        SymbolLayoutProperties::Evaluated layout;
         SymbolQuads quads =
             getIconQuads(anchor, shapedIcon, line, layout, SymbolPlacementType::Point, shapedText);
 
@@ -80,9 +80,9 @@ TEST(getIconQuads, style) {
 
     // width
     {
-        SymbolLayoutProperties layout;
-        layout.textSize = LayoutProperty<float>(24.0f);
-        layout.iconTextFit = LayoutProperty<IconTextFitType>(IconTextFitType::Width);
+        SymbolLayoutProperties::Evaluated layout;
+        layout.get<TextSize>() = 24.0f;
+        layout.get<IconTextFit>() = IconTextFitType::Width;
         SymbolQuads quads =
             getIconQuads(anchor, shapedIcon, line, layout, SymbolPlacementType::Point, shapedText);
 
@@ -98,9 +98,9 @@ TEST(getIconQuads, style) {
 
     // width x textSize
     {
-        SymbolLayoutProperties layout;
-        layout.textSize = LayoutProperty<float>(12.0f);
-        layout.iconTextFit = LayoutProperty<IconTextFitType>(IconTextFitType::Width);
+        SymbolLayoutProperties::Evaluated layout;
+        layout.get<TextSize>() = 12.0f;
+        layout.get<IconTextFit>() = IconTextFitType::Width;
         SymbolQuads quads =
             getIconQuads(anchor, shapedIcon, line, layout, SymbolPlacementType::Point, shapedText);
 
@@ -116,13 +116,13 @@ TEST(getIconQuads, style) {
 
     // width x textSize + padding
     {
-        SymbolLayoutProperties layout;
-        layout.textSize = LayoutProperty<float>(12.0f);
-        layout.iconTextFit = LayoutProperty<IconTextFitType>(IconTextFitType::Width);
-        layout.iconTextFitPadding.value[0] = 5.0f;
-        layout.iconTextFitPadding.value[1] = 10.0f;
-        layout.iconTextFitPadding.value[2] = 5.0f;
-        layout.iconTextFitPadding.value[3] = 10.0f;
+        SymbolLayoutProperties::Evaluated layout;
+        layout.get<TextSize>() = 12.0f;
+        layout.get<IconTextFit>() = IconTextFitType::Width;
+        layout.get<IconTextFitPadding>()[0] = 5.0f;
+        layout.get<IconTextFitPadding>()[1] = 10.0f;
+        layout.get<IconTextFitPadding>()[2] = 5.0f;
+        layout.get<IconTextFitPadding>()[3] = 10.0f;
         SymbolQuads quads =
             getIconQuads(anchor, shapedIcon, line, layout, SymbolPlacementType::Point, shapedText);
 
@@ -138,9 +138,9 @@ TEST(getIconQuads, style) {
 
     // height
     {
-        SymbolLayoutProperties layout;
-        layout.textSize = LayoutProperty<float>(24.0f);
-        layout.iconTextFit = LayoutProperty<IconTextFitType>(IconTextFitType::Height);
+        SymbolLayoutProperties::Evaluated layout;
+        layout.get<TextSize>() = 24.0f;
+        layout.get<IconTextFit>() = IconTextFitType::Height;
         SymbolQuads quads =
             getIconQuads(anchor, shapedIcon, line, layout, SymbolPlacementType::Point, shapedText);
 
@@ -156,9 +156,9 @@ TEST(getIconQuads, style) {
 
     // height x textSize
     {
-        SymbolLayoutProperties layout;
-        layout.textSize = LayoutProperty<float>(12.0f);
-        layout.iconTextFit = LayoutProperty<IconTextFitType>(IconTextFitType::Height);
+        SymbolLayoutProperties::Evaluated layout;
+        layout.get<TextSize>() = 12.0f;
+        layout.get<IconTextFit>() = IconTextFitType::Height;
         SymbolQuads quads =
             getIconQuads(anchor, shapedIcon, line, layout, SymbolPlacementType::Point, shapedText);
 
@@ -174,13 +174,13 @@ TEST(getIconQuads, style) {
 
     // height x textSize + padding
     {
-        SymbolLayoutProperties layout;
-        layout.textSize = LayoutProperty<float>(12.0f);
-        layout.iconTextFit = LayoutProperty<IconTextFitType>(IconTextFitType::Height);
-        layout.iconTextFitPadding.value[0] = 5.0f;
-        layout.iconTextFitPadding.value[1] = 10.0f;
-        layout.iconTextFitPadding.value[2] = 5.0f;
-        layout.iconTextFitPadding.value[3] = 10.0f;
+        SymbolLayoutProperties::Evaluated layout;
+        layout.get<TextSize>() = 12.0f;
+        layout.get<IconTextFit>() = IconTextFitType::Height;
+        layout.get<IconTextFitPadding>()[0] = 5.0f;
+        layout.get<IconTextFitPadding>()[1] = 10.0f;
+        layout.get<IconTextFitPadding>()[2] = 5.0f;
+        layout.get<IconTextFitPadding>()[3] = 10.0f;
         SymbolQuads quads =
             getIconQuads(anchor, shapedIcon, line, layout, SymbolPlacementType::Point, shapedText);
 
@@ -196,9 +196,9 @@ TEST(getIconQuads, style) {
 
     // both
     {
-        SymbolLayoutProperties layout;
-        layout.textSize = LayoutProperty<float>(24.0f);
-        layout.iconTextFit = LayoutProperty<IconTextFitType>(IconTextFitType::Both);
+        SymbolLayoutProperties::Evaluated layout;
+        layout.get<TextSize>() = 24.0f;
+        layout.get<IconTextFit>() = IconTextFitType::Both;
         SymbolQuads quads =
             getIconQuads(anchor, shapedIcon, line, layout, SymbolPlacementType::Point, shapedText);
 
@@ -214,9 +214,9 @@ TEST(getIconQuads, style) {
 
     // both x textSize
     {
-        SymbolLayoutProperties layout;
-        layout.textSize = LayoutProperty<float>(12.0f);
-        layout.iconTextFit = LayoutProperty<IconTextFitType>(IconTextFitType::Both);
+        SymbolLayoutProperties::Evaluated layout;
+        layout.get<TextSize>() = 12.0f;
+        layout.get<IconTextFit>() = IconTextFitType::Both;
         SymbolQuads quads =
             getIconQuads(anchor, shapedIcon, line, layout, SymbolPlacementType::Point, shapedText);
 
@@ -232,13 +232,13 @@ TEST(getIconQuads, style) {
 
     // both x textSize + padding
     {
-        SymbolLayoutProperties layout;
-        layout.textSize = LayoutProperty<float>(12.0f);
-        layout.iconTextFit = LayoutProperty<IconTextFitType>(IconTextFitType::Both);
-        layout.iconTextFitPadding.value[0] = 5.0f;
-        layout.iconTextFitPadding.value[1] = 10.0f;
-        layout.iconTextFitPadding.value[2] = 5.0f;
-        layout.iconTextFitPadding.value[3] = 10.0f;
+        SymbolLayoutProperties::Evaluated layout;
+        layout.get<TextSize>() = 12.0f;
+        layout.get<IconTextFit>() = IconTextFitType::Both;
+        layout.get<IconTextFitPadding>()[0] = 5.0f;
+        layout.get<IconTextFitPadding>()[1] = 10.0f;
+        layout.get<IconTextFitPadding>()[2] = 5.0f;
+        layout.get<IconTextFitPadding>()[3] = 10.0f;
         SymbolQuads quads =
             getIconQuads(anchor, shapedIcon, line, layout, SymbolPlacementType::Point, shapedText);
 
@@ -254,13 +254,13 @@ TEST(getIconQuads, style) {
 
     // both x textSize + padding t/r/b/l
     {
-        SymbolLayoutProperties layout;
-        layout.textSize = LayoutProperty<float>(12.0f);
-        layout.iconTextFit = LayoutProperty<IconTextFitType>(IconTextFitType::Both);
-        layout.iconTextFitPadding.value[0] = 0.0f;
-        layout.iconTextFitPadding.value[1] = 5.0f;
-        layout.iconTextFitPadding.value[2] = 10.0f;
-        layout.iconTextFitPadding.value[3] = 15.0f;
+        SymbolLayoutProperties::Evaluated layout;
+        layout.get<TextSize>() = 12.0f;
+        layout.get<IconTextFit>() = IconTextFitType::Both;
+        layout.get<IconTextFitPadding>()[0] = 0.0f;
+        layout.get<IconTextFitPadding>()[1] = 5.0f;
+        layout.get<IconTextFitPadding>()[2] = 10.0f;
+        layout.get<IconTextFitPadding>()[3] = 15.0f;
         SymbolQuads quads =
             getIconQuads(anchor, shapedIcon, line, layout, SymbolPlacementType::Point, shapedText);