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MapLibreParticleLab/test/text/quads.test.cpp
Taku Fukada 887e6021e6 feat(core): render local CJK glyphs at 2x texture resolution (#4304) 
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Bart Louwers <bart@emeel.net>
2026-07-01 14:52:01 +03:00

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#include <mbgl/geometry/anchor.hpp>
#include <mbgl/layout/symbol_instance.hpp>
#include <mbgl/style/image_impl.hpp>
#include <mbgl/style/layers/symbol_layer_properties.hpp>
#include <mbgl/test/util.hpp>
#include <mbgl/text/glyph.hpp>
#include <mbgl/text/quads.hpp>
#include <mbgl/text/shaping.hpp>
using namespace mbgl;
using namespace mbgl::style;
// Atlas padding is not scaled with textureScale, so a 2x glyph quad is 1
// logical pixel smaller than its 1x equivalent. GL JS-style fractional metrics
// keep its center aligned with the 1x quad.
TEST(getGlyphQuads, DoubleResolutionGlyphPreservesLogicalQuadSize) {
GlyphMetrics metrics1x;
metrics1x.width = 24;
metrics1x.height = 24;
metrics1x.left = 0;
metrics1x.top = -8;
metrics1x.advance = 24;
metrics1x.isDoubleResolution = false;
GlyphMetrics metrics2x = metrics1x;
metrics2x.left += 0.5f;
metrics2x.top -= 0.5f;
metrics2x.isDoubleResolution = true;
// Rects reflect the real DynamicTextureAtlas output: bitmap.size + 2 *
// ImagePosition::padding (= 2). 1x bitmap 30 -> rect 32; 2x bitmap 60 -> rect 62.
Shaping shapedText1x;
shapedText1x.positionedLines.emplace_back();
shapedText1x.positionedLines.back().positionedGlyphs.emplace_back(
PositionedGlyph(u'A', 0.0f, 0.0f, false, 0, 1.0f, Rect<uint16_t>(0, 0, 32, 32), metrics1x, std::nullopt));
Shaping shapedText2x;
shapedText2x.positionedLines.emplace_back();
shapedText2x.positionedLines.back().positionedGlyphs.emplace_back(
PositionedGlyph(u'A', 0.0f, 0.0f, false, 0, 1.0f, Rect<uint16_t>(0, 0, 62, 62), metrics2x, std::nullopt));
SymbolLayoutProperties::Evaluated layout;
SymbolQuads quads1x = getGlyphQuads(shapedText1x, {{0, 0}}, layout, SymbolPlacementType::Point, {}, false);
SymbolQuads quads2x = getGlyphQuads(shapedText2x, {{0, 0}}, layout, SymbolPlacementType::Point, {}, false);
ASSERT_EQ(quads1x.size(), 1u);
ASSERT_EQ(quads2x.size(), 1u);
// The 2x quad is 1 logical pixel smaller, and shifted by 0.5px to keep the
// same center as the 1x quad.
EXPECT_FLOAT_EQ(quads1x[0].tl.x + 0.5f, quads2x[0].tl.x);
EXPECT_FLOAT_EQ(quads1x[0].tl.y + 0.5f, quads2x[0].tl.y);
EXPECT_FLOAT_EQ(quads1x[0].br.x - 0.5f, quads2x[0].br.x);
EXPECT_FLOAT_EQ(quads1x[0].br.y - 0.5f, quads2x[0].br.y);
EXPECT_FLOAT_EQ(quads1x[0].br.x - quads1x[0].tl.x, 32.0f);
EXPECT_FLOAT_EQ(quads2x[0].br.x - quads2x[0].tl.x, 31.0f);
EXPECT_FLOAT_EQ(quads1x[0].br.y - quads1x[0].tl.y, 32.0f);
EXPECT_FLOAT_EQ(quads2x[0].br.y - quads2x[0].tl.y, 31.0f);
}
TEST(getIconQuads, normal) {
SymbolLayoutProperties::Evaluated layout;
Anchor anchor(2.0, 3.0, 0.0, 0);
ImagePosition image = {Rect<uint16_t>(0, 0, 15, 11), style::Image::Impl("test", PremultipliedImage({1, 1}), 1.0f)};
auto shapedIcon = PositionedIcon::shapeIcon(image, {{-6.5f, -4.5f}}, SymbolAnchorType::Center);
GeometryCoordinates line;
SymbolQuads quads = getIconQuads(shapedIcon, 0, SymbolContent::IconRGBA, false);
ASSERT_EQ(quads.size(), 1);
const auto& quad = quads[0];
EXPECT_FLOAT_EQ(quad.tl.x, -14);
EXPECT_FLOAT_EQ(quad.tl.y, -10);
EXPECT_FLOAT_EQ(quad.tr.x, 1);
EXPECT_FLOAT_EQ(quad.tr.y, -10);
EXPECT_FLOAT_EQ(quad.bl.x, -14);
EXPECT_FLOAT_EQ(quad.bl.y, 1);
EXPECT_FLOAT_EQ(quad.br.x, 1);
EXPECT_FLOAT_EQ(quad.br.y, 1);
}
TEST(getIconQuads, style) {
Anchor anchor(0.0, 0.0, 0.0, 0);
const ImagePosition image = {Rect<uint16_t>(0, 0, 20, 20),
style::Image::Impl("test", PremultipliedImage({1, 1}), 1.0f)};
GeometryCoordinates line;
Shaping shapedText;
shapedText.top = -10.0f;
shapedText.bottom = 30.0f;
shapedText.left = -60.0f;
shapedText.right = 20.0f;
// shapedText.positionedGlyphs.emplace_back(PositionedGlyph(32, 0.0f, 0.0f, false, 0, 1.0));
shapedText.positionedLines.emplace_back();
shapedText.positionedLines.back().positionedGlyphs.emplace_back(PositionedGlyph(32,
0.0f,
0.0f,
false,
0,
1.0,
/*texRect*/ {},
/*metrics*/ {},
/*imageID*/ std::nullopt));
// none
{
auto shapedIcon = PositionedIcon::shapeIcon(image, {{-9.5f, -9.5f}}, SymbolAnchorType::Center);
EXPECT_FLOAT_EQ(-18.5f, shapedIcon.top());
EXPECT_FLOAT_EQ(-0.5f, shapedIcon.right());
EXPECT_FLOAT_EQ(-0.5f, shapedIcon.bottom());
EXPECT_FLOAT_EQ(-18.5f, shapedIcon.left());
SymbolLayoutProperties::Evaluated layout;
SymbolQuads quads = getIconQuads(shapedIcon, 0, SymbolContent::IconRGBA, false);
ASSERT_EQ(quads.size(), 1);
const auto& quad = quads[0];
EXPECT_FLOAT_EQ(quad.tl.x, -19.5);
EXPECT_FLOAT_EQ(quad.tl.y, -19.5);
EXPECT_FLOAT_EQ(quad.tr.x, 0.5);
EXPECT_FLOAT_EQ(quad.tr.y, -19.5);
EXPECT_FLOAT_EQ(quad.bl.x, -19.5);
EXPECT_FLOAT_EQ(quad.bl.y, 0.5);
EXPECT_FLOAT_EQ(quad.br.x, 0.5);
EXPECT_FLOAT_EQ(quad.br.y, 0.5);
}
// width
{
auto shapedIcon = PositionedIcon::shapeIcon(image, {{-9.5f, -9.5f}}, SymbolAnchorType::Center);
shapedIcon.fitIconToText(shapedText, IconTextFitType::Width, {{0, 0, 0, 0}}, {{0, 0}}, 24.0f / 24.0f);
SymbolQuads quads = getIconQuads(shapedIcon, 0, SymbolContent::IconRGBA, false);
ASSERT_EQ(quads.size(), 1);
const auto& quad = quads[0];
EXPECT_FLOAT_EQ(quad.tl.x, -64.4444427f);
EXPECT_FLOAT_EQ(quad.tl.y, 0);
EXPECT_FLOAT_EQ(quad.tr.x, 24.4444427f);
EXPECT_FLOAT_EQ(quad.tr.y, 0);
EXPECT_FLOAT_EQ(quad.bl.x, -64.4444427f);
EXPECT_FLOAT_EQ(quad.bl.y, 20);
EXPECT_FLOAT_EQ(quad.br.x, 24.4444427f);
EXPECT_FLOAT_EQ(quad.br.y, 20);
}
// width x textSize
{
auto shapedIcon = PositionedIcon::shapeIcon(image, {{-9.5f, -9.5f}}, SymbolAnchorType::Center);
shapedIcon.fitIconToText(shapedText, IconTextFitType::Width, {{0, 0, 0, 0}}, {{0, 0}}, 12.0f / 24.0f);
SymbolQuads quads = getIconQuads(shapedIcon, 0, SymbolContent::IconRGBA, false);
ASSERT_EQ(quads.size(), 1);
const auto& quad = quads[0];
EXPECT_FLOAT_EQ(quad.tl.x, -32.2222214f);
EXPECT_FLOAT_EQ(quad.tl.y, -5);
EXPECT_FLOAT_EQ(quad.tr.x, 12.2222214f);
EXPECT_FLOAT_EQ(quad.tr.y, -5);
EXPECT_FLOAT_EQ(quad.bl.x, -32.2222214f);
EXPECT_FLOAT_EQ(quad.bl.y, 15);
EXPECT_FLOAT_EQ(quad.br.x, 12.2222214f);
EXPECT_FLOAT_EQ(quad.br.y, 15);
}
// width x textSize + padding
{
auto shapedIcon = PositionedIcon::shapeIcon(image, {{-9.5f, -9.5f}}, SymbolAnchorType::Center);
shapedIcon.fitIconToText(shapedText, IconTextFitType::Width, {{5, 10, 5, 10}}, {{0, 0}}, 12.0f / 24.0f);
SymbolQuads quads = getIconQuads(shapedIcon, 0, SymbolContent::IconRGBA, false);
ASSERT_EQ(quads.size(), 1);
const auto& quad = quads[0];
EXPECT_FLOAT_EQ(quad.tl.x, -43.3333321f);
EXPECT_FLOAT_EQ(quad.tl.y, -5);
EXPECT_FLOAT_EQ(quad.tr.x, 23.3333321f);
EXPECT_FLOAT_EQ(quad.tr.y, -5);
EXPECT_FLOAT_EQ(quad.bl.x, -43.3333321f);
EXPECT_FLOAT_EQ(quad.bl.y, 15);
EXPECT_FLOAT_EQ(quad.br.x, 23.3333321f);
EXPECT_FLOAT_EQ(quad.br.y, 15);
}
// height
{
auto shapedIcon = PositionedIcon::shapeIcon(image, {{-9.5f, -9.5f}}, SymbolAnchorType::Center);
shapedIcon.fitIconToText(shapedText, IconTextFitType::Height, {{0, 0, 0, 0}}, {{0, 0}}, 24.0f / 24.0f);
SymbolQuads quads = getIconQuads(shapedIcon, 0, SymbolContent::IconRGBA, false);
ASSERT_EQ(quads.size(), 1);
const auto& quad = quads[0];
EXPECT_FLOAT_EQ(quad.tl.x, -30);
EXPECT_FLOAT_EQ(quad.tl.y, -12.2222214f);
EXPECT_FLOAT_EQ(quad.tr.x, -10);
EXPECT_FLOAT_EQ(quad.tr.y, -12.2222214f);
EXPECT_FLOAT_EQ(quad.bl.x, -30);
EXPECT_FLOAT_EQ(quad.bl.y, 32.2222214f);
EXPECT_FLOAT_EQ(quad.br.x, -10);
EXPECT_FLOAT_EQ(quad.br.y, 32.2222214f);
}
// height x textSize
{
SymbolLayoutProperties::Evaluated layout;
auto shapedIcon = PositionedIcon::shapeIcon(image, {{-9.5f, -9.5f}}, SymbolAnchorType::Center);
shapedIcon.fitIconToText(shapedText, IconTextFitType::Height, {{0, 0, 0, 0}}, {{0, 0}}, 12.0f / 24.0f);
SymbolQuads quads = getIconQuads(shapedIcon, 0, SymbolContent::IconRGBA, false);
ASSERT_EQ(quads.size(), 1);
const auto& quad = quads[0];
EXPECT_FLOAT_EQ(quad.tl.x, -20);
EXPECT_FLOAT_EQ(quad.tl.y, -6.11111069f);
EXPECT_FLOAT_EQ(quad.tr.x, 0);
EXPECT_FLOAT_EQ(quad.tr.y, -6.11111069f);
EXPECT_FLOAT_EQ(quad.bl.x, -20);
EXPECT_FLOAT_EQ(quad.bl.y, 16.1111107f);
EXPECT_FLOAT_EQ(quad.br.x, 0);
EXPECT_FLOAT_EQ(quad.br.y, 16.1111107f);
}
// height x textSize + padding
{
auto shapedIcon = PositionedIcon::shapeIcon(image, {{-9.5f, -9.5f}}, SymbolAnchorType::Center);
shapedIcon.fitIconToText(shapedText, IconTextFitType::Height, {{5, 10, 5, 20}}, {{0, 0}}, 12.0f / 24.0f);
SymbolQuads quads = getIconQuads(shapedIcon, 0, SymbolContent::IconRGBA, false);
ASSERT_EQ(quads.size(), 1);
const auto& quad = quads[0];
EXPECT_FLOAT_EQ(quad.tl.x, -20);
EXPECT_FLOAT_EQ(quad.tl.y, -11.666666f);
EXPECT_FLOAT_EQ(quad.tr.x, 0);
EXPECT_FLOAT_EQ(quad.tr.y, -11.666666f);
EXPECT_FLOAT_EQ(quad.bl.x, -20);
EXPECT_FLOAT_EQ(quad.bl.y, 21.666666f);
EXPECT_FLOAT_EQ(quad.br.x, 0);
EXPECT_FLOAT_EQ(quad.br.y, 21.666666f);
}
// both
{
auto shapedIcon = PositionedIcon::shapeIcon(image, {{-9.5f, -9.5f}}, SymbolAnchorType::Center);
shapedIcon.fitIconToText(shapedText, IconTextFitType::Both, {{0, 0, 0, 0}}, {{0, 0}}, 24.0f / 24.0f);
SymbolQuads quads = getIconQuads(shapedIcon, 0, SymbolContent::IconRGBA, false);
ASSERT_EQ(quads.size(), 1);
const auto& quad = quads[0];
EXPECT_FLOAT_EQ(quad.tl.x, -64.4444427f);
EXPECT_FLOAT_EQ(quad.tl.y, -12.2222214f);
EXPECT_FLOAT_EQ(quad.tr.x, 24.4444427f);
EXPECT_FLOAT_EQ(quad.tr.y, -12.2222214f);
EXPECT_FLOAT_EQ(quad.bl.x, -64.4444427f);
EXPECT_FLOAT_EQ(quad.bl.y, 32.2222214f);
EXPECT_FLOAT_EQ(quad.br.x, 24.4444427f);
EXPECT_FLOAT_EQ(quad.br.y, 32.2222214f);
}
// both x textSize
{
auto shapedIcon = PositionedIcon::shapeIcon(image, {{-9.5f, -9.5f}}, SymbolAnchorType::Center);
shapedIcon.fitIconToText(shapedText, IconTextFitType::Both, {{0, 0, 0, 0}}, {{0, 0}}, 12.0f / 24.0f);
SymbolQuads quads = getIconQuads(shapedIcon, 0, SymbolContent::IconRGBA, false);
ASSERT_EQ(quads.size(), 1);
const auto& quad = quads[0];
EXPECT_FLOAT_EQ(quad.tl.x, -32.2222214f);
EXPECT_FLOAT_EQ(quad.tl.y, -6.11111069f);
EXPECT_FLOAT_EQ(quad.tr.x, 12.2222214f);
EXPECT_FLOAT_EQ(quad.tr.y, -6.11111069f);
EXPECT_FLOAT_EQ(quad.bl.x, -32.2222214f);
EXPECT_FLOAT_EQ(quad.bl.y, 16.1111107f);
EXPECT_FLOAT_EQ(quad.br.x, 12.2222214f);
EXPECT_FLOAT_EQ(quad.br.y, 16.1111107f);
}
// both x textSize + padding
{
auto shapedIcon = PositionedIcon::shapeIcon(image, {{-9.5f, -9.5f}}, SymbolAnchorType::Center);
shapedIcon.fitIconToText(shapedText, IconTextFitType::Both, {{5, 10, 5, 10}}, {{0, 0}}, 12.0f / 24.0f);
SymbolQuads quads = getIconQuads(shapedIcon, 0, SymbolContent::IconRGBA, false);
ASSERT_EQ(quads.size(), 1);
const auto& quad = quads[0];
EXPECT_FLOAT_EQ(quad.tl.x, -43.3333321f);
EXPECT_FLOAT_EQ(quad.tl.y, -11.666666f);
EXPECT_FLOAT_EQ(quad.tr.x, 23.3333321f);
EXPECT_FLOAT_EQ(quad.tr.y, -11.666666f);
EXPECT_FLOAT_EQ(quad.bl.x, -43.3333321f);
EXPECT_FLOAT_EQ(quad.bl.y, 21.666666f);
EXPECT_FLOAT_EQ(quad.br.x, 23.3333321f);
EXPECT_FLOAT_EQ(quad.br.y, 21.666666f);
}
// both x textSize + padding t/r/b/l
{
SymbolLayoutProperties::Evaluated layout;
layout.get<TextSize>() = 12.0f;
auto shapedIcon = PositionedIcon::shapeIcon(image, {{-9.5f, -9.5f}}, SymbolAnchorType::Center);
shapedIcon.fitIconToText(shapedText, IconTextFitType::Both, {{0, 5, 10, 15}}, {{0, 0}}, 12.0f / 24.0f);
SymbolQuads quads = getIconQuads(shapedIcon, 0, SymbolContent::IconRGBA, false);
ASSERT_EQ(quads.size(), 1);
const auto& quad = quads[0];
EXPECT_FLOAT_EQ(quad.tl.x, -48.3333321f);
EXPECT_FLOAT_EQ(quad.tl.y, -6.66666603f);
EXPECT_FLOAT_EQ(quad.tr.x, 18.3333321f);
EXPECT_FLOAT_EQ(quad.tr.y, -6.66666603f);
EXPECT_FLOAT_EQ(quad.bl.x, -48.3333321f);
EXPECT_FLOAT_EQ(quad.bl.y, 26.666666f);
EXPECT_FLOAT_EQ(quad.br.x, 18.3333321f);
EXPECT_FLOAT_EQ(quad.br.y, 26.666666f);
}
}
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