38fcbe21d4
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.
248 lines
9.3 KiB
C++
248 lines
9.3 KiB
C++
#include <mbgl/text/quads.hpp>
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#include <mbgl/text/shaping.hpp>
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#include <mbgl/tile/geometry_tile_data.hpp>
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#include <mbgl/geometry/anchor.hpp>
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#include <mbgl/style/layers/symbol_layer_properties.hpp>
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#include <mbgl/util/math.hpp>
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#include <mbgl/util/constants.hpp>
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#include <cassert>
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namespace mbgl {
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using namespace style;
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const float globalMinScale = 0.5f; // underscale by 1 zoom level
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SymbolQuads getIconQuads(Anchor& anchor, const PositionedIcon& shapedIcon,
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const GeometryCoordinates& line, const SymbolLayoutProperties::Evaluated& layout,
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const style::SymbolPlacementType placement, const Shaping& shapedText) {
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auto image = *(shapedIcon.image);
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const float border = 1.0;
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auto left = shapedIcon.left - border;
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auto right = left + image.pos.w / image.relativePixelRatio;
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auto top = shapedIcon.top - border;
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auto bottom = top + image.pos.h / image.relativePixelRatio;
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Point<float> tl;
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Point<float> tr;
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Point<float> br;
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Point<float> bl;
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if (layout.get<IconTextFit>() != IconTextFitType::None && shapedText) {
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auto iconWidth = right - left;
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auto iconHeight = bottom - top;
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auto size = layout.get<TextSize>() / 24.0f;
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auto textLeft = shapedText.left * size;
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auto textRight = shapedText.right * size;
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auto textTop = shapedText.top * size;
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auto textBottom = shapedText.bottom * size;
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auto textWidth = textRight - textLeft;
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auto textHeight = textBottom - textTop;;
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auto padT = layout.get<IconTextFitPadding>()[0];
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auto padR = layout.get<IconTextFitPadding>()[1];
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auto padB = layout.get<IconTextFitPadding>()[2];
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auto padL = layout.get<IconTextFitPadding>()[3];
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auto offsetY = layout.get<IconTextFit>() == IconTextFitType::Width ? (textHeight - iconHeight) * 0.5 : 0;
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auto offsetX = layout.get<IconTextFit>() == IconTextFitType::Height ? (textWidth - iconWidth) * 0.5 : 0;
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auto width = layout.get<IconTextFit>() == IconTextFitType::Width || layout.get<IconTextFit>() == IconTextFitType::Both ? textWidth : iconWidth;
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auto height = layout.get<IconTextFit>() == IconTextFitType::Height || layout.get<IconTextFit>() == IconTextFitType::Both ? textHeight : iconHeight;
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left = textLeft + offsetX - padL;
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top = textTop + offsetY - padT;
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right = textLeft + offsetX + padR + width;
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bottom = textTop + offsetY + padB + height;
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tl = {left, top};
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tr = {right, top};
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br = {right, bottom};
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bl = {left, bottom};
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} else {
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tl = {left, top};
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tr = {right, top};
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br = {right, bottom};
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bl = {left, bottom};
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}
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float angle = layout.get<IconRotate>() * util::DEG2RAD;
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if (placement == style::SymbolPlacementType::Line) {
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assert(static_cast<unsigned int>(anchor.segment) < line.size());
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const GeometryCoordinate &prev= line[anchor.segment];
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if (anchor.point.y == prev.y && anchor.point.x == prev.x &&
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static_cast<unsigned int>(anchor.segment + 1) < line.size()) {
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const GeometryCoordinate &next= line[anchor.segment + 1];
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angle += std::atan2(anchor.point.y - next.y, anchor.point.x - next.x) + M_PI;
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} else {
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angle += std::atan2(anchor.point.y - prev.y, anchor.point.x - prev.x);
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}
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}
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if (angle) {
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// Compute the transformation matrix.
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float angle_sin = std::sin(angle);
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float angle_cos = std::cos(angle);
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std::array<float, 4> matrix = {{angle_cos, -angle_sin, angle_sin, angle_cos}};
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tl = util::matrixMultiply(matrix, tl);
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tr = util::matrixMultiply(matrix, tr);
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bl = util::matrixMultiply(matrix, bl);
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br = util::matrixMultiply(matrix, br);
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}
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SymbolQuads quads;
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quads.emplace_back(tl, tr, bl, br, image.pos, 0, 0, anchor.point, globalMinScale, std::numeric_limits<float>::infinity());
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return quads;
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}
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struct GlyphInstance {
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explicit GlyphInstance(Point<float> anchorPoint_) : anchorPoint(std::move(anchorPoint_)) {}
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explicit GlyphInstance(Point<float> anchorPoint_, float offset_, float minScale_, float maxScale_,
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float angle_)
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: anchorPoint(std::move(anchorPoint_)), offset(offset_), minScale(minScale_), maxScale(maxScale_), angle(angle_) {}
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const Point<float> anchorPoint;
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const float offset = 0.0f;
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const float minScale = globalMinScale;
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const float maxScale = std::numeric_limits<float>::infinity();
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const float angle = 0.0f;
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};
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typedef std::vector<GlyphInstance> GlyphInstances;
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void getSegmentGlyphs(std::back_insert_iterator<GlyphInstances> glyphs, Anchor &anchor,
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float offset, const GeometryCoordinates &line, int segment, bool forward) {
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const bool upsideDown = !forward;
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if (offset < 0)
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forward = !forward;
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if (forward)
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segment++;
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assert((int)line.size() > segment);
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Point<float> end = convertPoint<float>(line[segment]);
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Point<float> newAnchorPoint = anchor.point;
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float prevscale = std::numeric_limits<float>::infinity();
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offset = std::fabs(offset);
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const float placementScale = anchor.scale;
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while (true) {
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const float dist = util::dist<float>(newAnchorPoint, end);
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const float scale = offset / dist;
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float angle = std::atan2(end.y - newAnchorPoint.y, end.x - newAnchorPoint.x);
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if (!forward)
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angle += M_PI;
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glyphs = GlyphInstance{
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/* anchor */ newAnchorPoint,
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/* offset */ static_cast<float>(upsideDown ? M_PI : 0.0),
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/* minScale */ scale,
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/* maxScale */ prevscale,
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/* angle */ static_cast<float>(std::fmod((angle + 2.0 * M_PI), (2.0 * M_PI)))};
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if (scale <= placementScale)
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break;
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newAnchorPoint = end;
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// skip duplicate nodes
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while (newAnchorPoint == end) {
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segment += forward ? 1 : -1;
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if ((int)line.size() <= segment || segment < 0) {
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anchor.scale = scale;
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return;
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}
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end = convertPoint<float>(line[segment]);
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}
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Point<float> normal = util::normal<float>(newAnchorPoint, end) * dist;
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newAnchorPoint = newAnchorPoint - normal;
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prevscale = scale;
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}
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}
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SymbolQuads getGlyphQuads(Anchor& anchor, const Shaping& shapedText,
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const float boxScale, const GeometryCoordinates& line, const SymbolLayoutProperties::Evaluated& layout,
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const style::SymbolPlacementType placement, const GlyphPositions& face) {
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const float textRotate = layout.get<TextRotate>() * util::DEG2RAD;
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const bool keepUpright = layout.get<TextKeepUpright>();
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SymbolQuads quads;
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for (const PositionedGlyph &positionedGlyph: shapedText.positionedGlyphs) {
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auto face_it = face.find(positionedGlyph.glyph);
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if (face_it == face.end())
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continue;
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const Glyph &glyph = face_it->second;
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const Rect<uint16_t> &rect = glyph.rect;
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if (!glyph)
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continue;
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if (!rect.hasArea())
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continue;
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const float centerX = (positionedGlyph.x + glyph.metrics.advance / 2.0f) * boxScale;
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GlyphInstances glyphInstances;
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if (placement == style::SymbolPlacementType::Line) {
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getSegmentGlyphs(std::back_inserter(glyphInstances), anchor, centerX, line, anchor.segment, true);
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if (keepUpright)
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getSegmentGlyphs(std::back_inserter(glyphInstances), anchor, centerX, line, anchor.segment, false);
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} else {
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glyphInstances.emplace_back(GlyphInstance{anchor.point});
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}
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// The rects have an addditional buffer that is not included in their size;
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const float glyphPadding = 1.0f;
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const float rectBuffer = 3.0f + glyphPadding;
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const float x1 = positionedGlyph.x + glyph.metrics.left - rectBuffer;
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const float y1 = positionedGlyph.y - glyph.metrics.top - rectBuffer;
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const float x2 = x1 + rect.w;
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const float y2 = y1 + rect.h;
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const Point<float> otl{x1, y1};
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const Point<float> otr{x2, y1};
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const Point<float> obl{x1, y2};
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const Point<float> obr{x2, y2};
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for (const GlyphInstance &instance : glyphInstances) {
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Point<float> tl = otl;
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Point<float> tr = otr;
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Point<float> bl = obl;
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Point<float> br = obr;
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if (textRotate) {
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// Compute the transformation matrix.
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float angle_sin = std::sin(textRotate);
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float angle_cos = std::cos(textRotate);
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std::array<float, 4> matrix = {{angle_cos, -angle_sin, angle_sin, angle_cos}};
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tl = util::matrixMultiply(matrix, tl);
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tr = util::matrixMultiply(matrix, tr);
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bl = util::matrixMultiply(matrix, bl);
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br = util::matrixMultiply(matrix, br);
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}
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// Prevent label from extending past the end of the line
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const float glyphMinScale = std::max(instance.minScale, anchor.scale);
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const float anchorAngle = std::fmod((anchor.angle + instance.offset + 2 * M_PI), (2 * M_PI));
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const float glyphAngle = std::fmod((instance.angle + instance.offset + 2 * M_PI), (2 * M_PI));
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quads.emplace_back(tl, tr, bl, br, rect, anchorAngle, glyphAngle, instance.anchorPoint, glyphMinScale, instance.maxScale);
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}
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}
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return quads;
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}
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} // namespace mbgl
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