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-rw-r--r--gfx/gl/gtest/TestColorspaces.cpp405
-rw-r--r--gfx/gl/gtest/moz.build15
2 files changed, 420 insertions, 0 deletions
diff --git a/gfx/gl/gtest/TestColorspaces.cpp b/gfx/gl/gtest/TestColorspaces.cpp
new file mode 100644
index 0000000000..af204c7fc9
--- /dev/null
+++ b/gfx/gl/gtest/TestColorspaces.cpp
@@ -0,0 +1,405 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "gtest/gtest.h"
+#include "Colorspaces.h"
+
+#include <limits>
+
+namespace mozilla::color {
+mat4 YuvFromYcbcr(const YcbcrDesc&);
+float TfFromLinear(const PiecewiseGammaDesc&, float linear);
+float LinearFromTf(const PiecewiseGammaDesc&, float tf);
+} // namespace mozilla::color
+
+using namespace mozilla::color;
+
+auto Calc8From8(const ColorspaceTransform& ct, const ivec3 in8) {
+ const auto in = vec3(in8) / vec3(255);
+ const auto out = ct.DstFromSrc(in);
+ const auto out8 = ivec3(round(out * vec3(255)));
+ return out8;
+}
+
+auto Sample8From8(const Lut3& lut, const vec3 in8) {
+ const auto in = in8 / vec3(255);
+ const auto out = lut.Sample(in);
+ const auto out8 = ivec3(round(out * vec3(255)));
+ return out8;
+}
+
+TEST(Colorspaces, YcbcrDesc_Narrow8)
+{
+ const auto m = YuvFromYcbcr(YcbcrDesc::Narrow8());
+
+ const auto Yuv8 = [&](const ivec3 ycbcr8) {
+ const auto ycbcr = vec4(vec3(ycbcr8) / 255, 1);
+ const auto yuv = m * ycbcr;
+ return ivec3(round(yuv * 255));
+ };
+
+ EXPECT_EQ(Yuv8({{16, 128, 128}}), (ivec3{{0, 0, 0}}));
+ EXPECT_EQ(Yuv8({{17, 128, 128}}), (ivec3{{1, 0, 0}}));
+ // y = 0.5 => (16 + 235) / 2 = 125.5
+ EXPECT_EQ(Yuv8({{125, 128, 128}}), (ivec3{{127, 0, 0}}));
+ EXPECT_EQ(Yuv8({{126, 128, 128}}), (ivec3{{128, 0, 0}}));
+ EXPECT_EQ(Yuv8({{234, 128, 128}}), (ivec3{{254, 0, 0}}));
+ EXPECT_EQ(Yuv8({{235, 128, 128}}), (ivec3{{255, 0, 0}}));
+
+ // Check that we get the naive out-of-bounds behavior we'd expect:
+ EXPECT_EQ(Yuv8({{15, 128, 128}}), (ivec3{{-1, 0, 0}}));
+ EXPECT_EQ(Yuv8({{236, 128, 128}}), (ivec3{{256, 0, 0}}));
+}
+
+TEST(Colorspaces, YcbcrDesc_Full8)
+{
+ const auto m = YuvFromYcbcr(YcbcrDesc::Full8());
+
+ const auto Yuv8 = [&](const ivec3 ycbcr8) {
+ const auto ycbcr = vec4(vec3(ycbcr8) / 255, 1);
+ const auto yuv = m * ycbcr;
+ return ivec3(round(yuv * 255));
+ };
+
+ EXPECT_EQ(Yuv8({{0, 128, 128}}), (ivec3{{0, 0, 0}}));
+ EXPECT_EQ(Yuv8({{1, 128, 128}}), (ivec3{{1, 0, 0}}));
+ EXPECT_EQ(Yuv8({{127, 128, 128}}), (ivec3{{127, 0, 0}}));
+ EXPECT_EQ(Yuv8({{128, 128, 128}}), (ivec3{{128, 0, 0}}));
+ EXPECT_EQ(Yuv8({{254, 128, 128}}), (ivec3{{254, 0, 0}}));
+ EXPECT_EQ(Yuv8({{255, 128, 128}}), (ivec3{{255, 0, 0}}));
+}
+
+TEST(Colorspaces, YcbcrDesc_Float)
+{
+ const auto m = YuvFromYcbcr(YcbcrDesc::Float());
+
+ const auto Yuv8 = [&](const vec3 ycbcr8) {
+ const auto ycbcr = vec4(vec3(ycbcr8) / 255, 1);
+ const auto yuv = m * ycbcr;
+ return ivec3(round(yuv * 255));
+ };
+
+ EXPECT_EQ(Yuv8({{0, 0.5 * 255, 0.5 * 255}}), (ivec3{{0, 0, 0}}));
+ EXPECT_EQ(Yuv8({{1, 0.5 * 255, 0.5 * 255}}), (ivec3{{1, 0, 0}}));
+ EXPECT_EQ(Yuv8({{127, 0.5 * 255, 0.5 * 255}}), (ivec3{{127, 0, 0}}));
+ EXPECT_EQ(Yuv8({{128, 0.5 * 255, 0.5 * 255}}), (ivec3{{128, 0, 0}}));
+ EXPECT_EQ(Yuv8({{254, 0.5 * 255, 0.5 * 255}}), (ivec3{{254, 0, 0}}));
+ EXPECT_EQ(Yuv8({{255, 0.5 * 255, 0.5 * 255}}), (ivec3{{255, 0, 0}}));
+}
+
+TEST(Colorspaces, ColorspaceTransform_Rec709Narrow)
+{
+ const auto src = ColorspaceDesc{
+ Chromaticities::Rec709(),
+ PiecewiseGammaDesc::Rec709(),
+ {{YuvLumaCoeffs::Rec709(), YcbcrDesc::Narrow8()}},
+ };
+ const auto dst = ColorspaceDesc{
+ Chromaticities::Rec709(),
+ PiecewiseGammaDesc::Rec709(),
+ {},
+ };
+ const auto ct = ColorspaceTransform::Create(src, dst);
+
+ EXPECT_EQ(Calc8From8(ct, {{16, 128, 128}}), (ivec3{0}));
+ EXPECT_EQ(Calc8From8(ct, {{17, 128, 128}}), (ivec3{1}));
+ EXPECT_EQ(Calc8From8(ct, {{126, 128, 128}}), (ivec3{128}));
+ EXPECT_EQ(Calc8From8(ct, {{234, 128, 128}}), (ivec3{254}));
+ EXPECT_EQ(Calc8From8(ct, {{235, 128, 128}}), (ivec3{255}));
+
+ // Check that we get the naive out-of-bounds behavior we'd expect:
+ EXPECT_EQ(Calc8From8(ct, {{15, 128, 128}}), (ivec3{-1}));
+ EXPECT_EQ(Calc8From8(ct, {{236, 128, 128}}), (ivec3{256}));
+}
+
+TEST(Colorspaces, LutSample_Rec709Float)
+{
+ const auto src = ColorspaceDesc{
+ Chromaticities::Rec709(),
+ PiecewiseGammaDesc::Rec709(),
+ {{YuvLumaCoeffs::Rec709(), YcbcrDesc::Float()}},
+ };
+ const auto dst = ColorspaceDesc{
+ Chromaticities::Rec709(),
+ PiecewiseGammaDesc::Rec709(),
+ {},
+ };
+ const auto lut = ColorspaceTransform::Create(src, dst).ToLut3();
+
+ EXPECT_EQ(Sample8From8(lut, {{0, 0.5 * 255, 0.5 * 255}}), (ivec3{0}));
+ EXPECT_EQ(Sample8From8(lut, {{1, 0.5 * 255, 0.5 * 255}}), (ivec3{1}));
+ EXPECT_EQ(Sample8From8(lut, {{127, 0.5 * 255, 0.5 * 255}}), (ivec3{127}));
+ EXPECT_EQ(Sample8From8(lut, {{128, 0.5 * 255, 0.5 * 255}}), (ivec3{128}));
+ EXPECT_EQ(Sample8From8(lut, {{254, 0.5 * 255, 0.5 * 255}}), (ivec3{254}));
+ EXPECT_EQ(Sample8From8(lut, {{255, 0.5 * 255, 0.5 * 255}}), (ivec3{255}));
+}
+
+TEST(Colorspaces, LutSample_Rec709Narrow)
+{
+ const auto src = ColorspaceDesc{
+ Chromaticities::Rec709(),
+ PiecewiseGammaDesc::Rec709(),
+ {{YuvLumaCoeffs::Rec709(), YcbcrDesc::Narrow8()}},
+ };
+ const auto dst = ColorspaceDesc{
+ Chromaticities::Rec709(),
+ PiecewiseGammaDesc::Rec709(),
+ {},
+ };
+ const auto lut = ColorspaceTransform::Create(src, dst).ToLut3();
+
+ EXPECT_EQ(Sample8From8(lut, {{16, 128, 128}}), (ivec3{0}));
+ EXPECT_EQ(Sample8From8(lut, {{17, 128, 128}}), (ivec3{1}));
+ EXPECT_EQ(Sample8From8(lut, {{int((235 + 16) / 2), 128, 128}}), (ivec3{127}));
+ EXPECT_EQ(Sample8From8(lut, {{int((235 + 16) / 2) + 1, 128, 128}}),
+ (ivec3{128}));
+ EXPECT_EQ(Sample8From8(lut, {{234, 128, 128}}), (ivec3{254}));
+ EXPECT_EQ(Sample8From8(lut, {{235, 128, 128}}), (ivec3{255}));
+}
+
+TEST(Colorspaces, LutSample_Rec709Full)
+{
+ const auto src = ColorspaceDesc{
+ Chromaticities::Rec709(),
+ PiecewiseGammaDesc::Rec709(),
+ {{YuvLumaCoeffs::Rec709(), YcbcrDesc::Full8()}},
+ };
+ const auto dst = ColorspaceDesc{
+ Chromaticities::Rec709(),
+ PiecewiseGammaDesc::Rec709(),
+ {},
+ };
+ const auto lut = ColorspaceTransform::Create(src, dst).ToLut3();
+
+ EXPECT_EQ(Sample8From8(lut, {{0, 128, 128}}), (ivec3{0}));
+ EXPECT_EQ(Sample8From8(lut, {{1, 128, 128}}), (ivec3{1}));
+ EXPECT_EQ(Sample8From8(lut, {{16, 128, 128}}), (ivec3{16}));
+ EXPECT_EQ(Sample8From8(lut, {{128, 128, 128}}), (ivec3{128}));
+ EXPECT_EQ(Sample8From8(lut, {{235, 128, 128}}), (ivec3{235}));
+ EXPECT_EQ(Sample8From8(lut, {{254, 128, 128}}), (ivec3{254}));
+ EXPECT_EQ(Sample8From8(lut, {{255, 128, 128}}), (ivec3{255}));
+}
+
+TEST(Colorspaces, PiecewiseGammaDesc_Srgb)
+{
+ const auto tf = PiecewiseGammaDesc::Srgb();
+
+ EXPECT_EQ(int(roundf(TfFromLinear(tf, 0x00 / 255.0) * 255)), 0x00);
+ EXPECT_EQ(int(roundf(TfFromLinear(tf, 0x01 / 255.0) * 255)), 0x0d);
+ EXPECT_EQ(int(roundf(TfFromLinear(tf, 0x37 / 255.0) * 255)), 0x80);
+ EXPECT_EQ(int(roundf(TfFromLinear(tf, 0x80 / 255.0) * 255)), 0xbc);
+ EXPECT_EQ(int(roundf(TfFromLinear(tf, 0xfd / 255.0) * 255)), 0xfe);
+ EXPECT_EQ(int(roundf(TfFromLinear(tf, 0xfe / 255.0) * 255)), 0xff);
+ EXPECT_EQ(int(roundf(TfFromLinear(tf, 0xff / 255.0) * 255)), 0xff);
+
+ EXPECT_EQ(int(roundf(LinearFromTf(tf, 0x00 / 255.0) * 255)), 0x00);
+ EXPECT_EQ(int(roundf(LinearFromTf(tf, 0x01 / 255.0) * 255)), 0x00);
+ EXPECT_EQ(int(roundf(LinearFromTf(tf, 0x06 / 255.0) * 255)), 0x00);
+ EXPECT_EQ(int(roundf(LinearFromTf(tf, 0x07 / 255.0) * 255)), 0x01);
+ EXPECT_EQ(int(roundf(LinearFromTf(tf, 0x0d / 255.0) * 255)), 0x01);
+ EXPECT_EQ(int(roundf(LinearFromTf(tf, 0x80 / 255.0) * 255)), 0x37);
+ EXPECT_EQ(int(roundf(LinearFromTf(tf, 0xbc / 255.0) * 255)), 0x80);
+ EXPECT_EQ(int(roundf(LinearFromTf(tf, 0xfe / 255.0) * 255)), 0xfd);
+ EXPECT_EQ(int(roundf(LinearFromTf(tf, 0xff / 255.0) * 255)), 0xff);
+}
+
+TEST(Colorspaces, PiecewiseGammaDesc_Rec709)
+{
+ const auto tf = PiecewiseGammaDesc::Rec709();
+
+ EXPECT_EQ(int(roundf(TfFromLinear(tf, 0x00 / 255.0) * 255)), 0x00);
+ EXPECT_EQ(int(roundf(TfFromLinear(tf, 0x01 / 255.0) * 255)), 0x05);
+ EXPECT_EQ(int(roundf(TfFromLinear(tf, 0x43 / 255.0) * 255)), 0x80);
+ EXPECT_EQ(int(roundf(TfFromLinear(tf, 0x80 / 255.0) * 255)), 0xb4);
+ EXPECT_EQ(int(roundf(TfFromLinear(tf, 0xfd / 255.0) * 255)), 0xfe);
+ EXPECT_EQ(int(roundf(TfFromLinear(tf, 0xfe / 255.0) * 255)), 0xff);
+ EXPECT_EQ(int(roundf(TfFromLinear(tf, 0xff / 255.0) * 255)), 0xff);
+
+ EXPECT_EQ(int(roundf(LinearFromTf(tf, 0x00 / 255.0) * 255)), 0x00);
+ EXPECT_EQ(int(roundf(LinearFromTf(tf, 0x01 / 255.0) * 255)), 0x00);
+ EXPECT_EQ(int(roundf(LinearFromTf(tf, 0x02 / 255.0) * 255)), 0x00);
+ EXPECT_EQ(int(roundf(LinearFromTf(tf, 0x03 / 255.0) * 255)), 0x01);
+ EXPECT_EQ(int(roundf(LinearFromTf(tf, 0x05 / 255.0) * 255)), 0x01);
+ EXPECT_EQ(int(roundf(LinearFromTf(tf, 0x80 / 255.0) * 255)), 0x43);
+ EXPECT_EQ(int(roundf(LinearFromTf(tf, 0xb4 / 255.0) * 255)), 0x80);
+ EXPECT_EQ(int(roundf(LinearFromTf(tf, 0xfe / 255.0) * 255)), 0xfd);
+ EXPECT_EQ(int(roundf(LinearFromTf(tf, 0xff / 255.0) * 255)), 0xff);
+}
+
+TEST(Colorspaces, ColorspaceTransform_PiecewiseGammaDesc)
+{
+ const auto src = ColorspaceDesc{
+ Chromaticities::Srgb(),
+ {},
+ {},
+ };
+ const auto dst = ColorspaceDesc{
+ Chromaticities::Srgb(),
+ PiecewiseGammaDesc::Srgb(),
+ {},
+ };
+ const auto toGamma = ColorspaceTransform::Create(src, dst);
+ const auto toLinear = ColorspaceTransform::Create(dst, src);
+
+ EXPECT_EQ(Calc8From8(toGamma, ivec3{0x00}), (ivec3{0x00}));
+ EXPECT_EQ(Calc8From8(toGamma, ivec3{0x01}), (ivec3{0x0d}));
+ EXPECT_EQ(Calc8From8(toGamma, ivec3{0x37}), (ivec3{0x80}));
+ EXPECT_EQ(Calc8From8(toGamma, ivec3{0x80}), (ivec3{0xbc}));
+ EXPECT_EQ(Calc8From8(toGamma, ivec3{0xfd}), (ivec3{0xfe}));
+ EXPECT_EQ(Calc8From8(toGamma, ivec3{0xff}), (ivec3{0xff}));
+
+ EXPECT_EQ(Calc8From8(toLinear, ivec3{0x00}), (ivec3{0x00}));
+ EXPECT_EQ(Calc8From8(toLinear, ivec3{0x0d}), (ivec3{0x01}));
+ EXPECT_EQ(Calc8From8(toLinear, ivec3{0x80}), (ivec3{0x37}));
+ EXPECT_EQ(Calc8From8(toLinear, ivec3{0xbc}), (ivec3{0x80}));
+ EXPECT_EQ(Calc8From8(toLinear, ivec3{0xfe}), (ivec3{0xfd}));
+ EXPECT_EQ(Calc8From8(toLinear, ivec3{0xff}), (ivec3{0xff}));
+}
+
+// -
+// Actual end-to-end tests
+
+TEST(Colorspaces, SrgbFromRec709)
+{
+ const auto src = ColorspaceDesc{
+ Chromaticities::Rec709(),
+ PiecewiseGammaDesc::Rec709(),
+ {{YuvLumaCoeffs::Rec709(), YcbcrDesc::Narrow8()}},
+ };
+ const auto dst = ColorspaceDesc{
+ Chromaticities::Srgb(),
+ PiecewiseGammaDesc::Srgb(),
+ {},
+ };
+ const auto ct = ColorspaceTransform::Create(src, dst);
+
+ EXPECT_EQ(Calc8From8(ct, ivec3{{16, 128, 128}}), (ivec3{0}));
+ EXPECT_EQ(Calc8From8(ct, ivec3{{17, 128, 128}}), (ivec3{3}));
+ EXPECT_EQ(Calc8From8(ct, ivec3{{115, 128, 128}}), (ivec3{128}));
+ EXPECT_EQ(Calc8From8(ct, ivec3{{126, 128, 128}}), (ivec3{140}));
+ EXPECT_EQ(Calc8From8(ct, ivec3{{234, 128, 128}}), (ivec3{254}));
+ EXPECT_EQ(Calc8From8(ct, ivec3{{235, 128, 128}}), (ivec3{255}));
+}
+
+TEST(Colorspaces, SrgbFromDisplayP3)
+{
+ const auto p3C = ColorspaceDesc{
+ Chromaticities::DisplayP3(),
+ PiecewiseGammaDesc::DisplayP3(),
+ };
+ const auto srgbC = ColorspaceDesc{
+ Chromaticities::Srgb(),
+ PiecewiseGammaDesc::Srgb(),
+ };
+ const auto srgbLinearC = ColorspaceDesc{
+ Chromaticities::Srgb(),
+ {},
+ };
+ const auto srgbFromP3 = ColorspaceTransform::Create(p3C, srgbC);
+ const auto srgbLinearFromP3 = ColorspaceTransform::Create(p3C, srgbLinearC);
+
+ // E.g.
+ // https://colorjs.io/apps/convert/?color=color(display-p3%200.4%200.8%200.4)&precision=4
+ auto srgb = srgbFromP3.DstFromSrc(vec3{{0.4, 0.8, 0.4}});
+ EXPECT_NEAR(srgb.x(), 0.179, 0.001);
+ EXPECT_NEAR(srgb.y(), 0.812, 0.001);
+ EXPECT_NEAR(srgb.z(), 0.342, 0.001);
+ auto srgbLinear = srgbLinearFromP3.DstFromSrc(vec3{{0.4, 0.8, 0.4}});
+ EXPECT_NEAR(srgbLinear.x(), 0.027, 0.001);
+ EXPECT_NEAR(srgbLinear.y(), 0.624, 0.001);
+ EXPECT_NEAR(srgbLinear.z(), 0.096, 0.001);
+}
+
+// -
+
+struct Stats {
+ double mean = 0;
+ double variance = 0;
+ double min = std::numeric_limits<double>::infinity();
+ double max = -std::numeric_limits<double>::infinity();
+
+ template <class T>
+ static Stats For(const T& iterable) {
+ auto ret = Stats{};
+ for (const auto& cur : iterable) {
+ ret.mean += cur;
+ ret.min = std::min(ret.min, cur);
+ ret.max = std::max(ret.max, cur);
+ }
+ ret.mean /= iterable.size();
+ for (const auto& cur : iterable) {
+ ret.variance += pow(cur - ret.mean, 2);
+ }
+ ret.variance /= iterable.size();
+ return ret;
+ }
+
+ double standardDeviation() const { return sqrt(variance); }
+};
+
+static Stats StatsForLutError(const ColorspaceTransform& ct,
+ const ivec3 srcQuants, const ivec3 dstQuants) {
+ const auto lut = ct.ToLut3();
+
+ const auto dstScale = vec3(dstQuants - 1);
+
+ std::vector<double> quantErrors;
+ quantErrors.reserve(srcQuants.x() * srcQuants.y() * srcQuants.z());
+ ForEachSampleWithin(srcQuants, [&](const vec3& src) {
+ const auto sampled = lut.Sample(src);
+ const auto actual = ct.DstFromSrc(src);
+ const auto isampled = ivec3(round(sampled * dstScale));
+ const auto iactual = ivec3(round(actual * dstScale));
+ const auto ierr = abs(isampled - iactual);
+ const auto quantError = dot(ierr, ivec3{1});
+ quantErrors.push_back(quantError);
+ if (quantErrors.size() % 100000 == 0) {
+ printf("%zu of %zu\n", quantErrors.size(), quantErrors.capacity());
+ }
+ });
+
+ const auto quantErrStats = Stats::For(quantErrors);
+ return quantErrStats;
+}
+
+TEST(Colorspaces, LutError_Rec709Full_Rec709Rgb)
+{
+ const auto src = ColorspaceDesc{
+ Chromaticities::Rec709(),
+ PiecewiseGammaDesc::Rec709(),
+ {{YuvLumaCoeffs::Rec709(), YcbcrDesc::Full8()}},
+ };
+ const auto dst = ColorspaceDesc{
+ Chromaticities::Rec709(),
+ PiecewiseGammaDesc::Rec709(),
+ {},
+ };
+ const auto ct = ColorspaceTransform::Create(src, dst);
+ const auto stats = StatsForLutError(ct, ivec3{64}, ivec3{256});
+ EXPECT_NEAR(stats.mean, 0.000, 0.001);
+ EXPECT_NEAR(stats.standardDeviation(), 0.008, 0.001);
+ EXPECT_NEAR(stats.min, 0, 0.001);
+ EXPECT_NEAR(stats.max, 1, 0.001);
+}
+
+TEST(Colorspaces, LutError_Rec709Full_Srgb)
+{
+ const auto src = ColorspaceDesc{
+ Chromaticities::Rec709(),
+ PiecewiseGammaDesc::Rec709(),
+ {{YuvLumaCoeffs::Rec709(), YcbcrDesc::Full8()}},
+ };
+ const auto dst = ColorspaceDesc{
+ Chromaticities::Srgb(),
+ PiecewiseGammaDesc::Srgb(),
+ {},
+ };
+ const auto ct = ColorspaceTransform::Create(src, dst);
+ const auto stats = StatsForLutError(ct, ivec3{64}, ivec3{256});
+ EXPECT_NEAR(stats.mean, 0.530, 0.001);
+ EXPECT_NEAR(stats.standardDeviation(), 1.674, 0.001);
+ EXPECT_NEAR(stats.min, 0, 0.001);
+ EXPECT_NEAR(stats.max, 17, 0.001);
+}
diff --git a/gfx/gl/gtest/moz.build b/gfx/gl/gtest/moz.build
new file mode 100644
index 0000000000..5b57e3ded1
--- /dev/null
+++ b/gfx/gl/gtest/moz.build
@@ -0,0 +1,15 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+LOCAL_INCLUDES += [
+ "/gfx/gl",
+]
+
+UNIFIED_SOURCES += [
+ "TestColorspaces.cpp",
+]
+
+FINAL_LIBRARY = "xul-gtest"
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-30 11:40:38 +0000