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ICC: Add a test for Profile::to_pcs

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This commit is contained in:
Nico Weber 2023-04-28 13:50:11 -04:00 • committed by Andreas Kling
parent af453b246a
commit de7a413a9f
1 changed files with 58 additions and 0 deletions
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58
Tests/LibGfx/TestICCProfile.cpp
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@ -95,3 +95,61 @@ TEST_CASE(built_in_sRGB)
i = AK::convert_between_host_and_big_endian(i);
EXPECT(memmem(serialized_bytes.data(), serialized_bytes.size(), sf32, sizeof(sf32)) != nullptr);
}
TEST_CASE(to_pcs)
{
auto sRGB = MUST(Gfx::ICC::sRGB());
EXPECT(sRGB->data_color_space() == Gfx::ICC::ColorSpace::RGB);
EXPECT(sRGB->connection_space() == Gfx::ICC::ColorSpace::PCSXYZ);
auto sRGB_curve_pointer = MUST(Gfx::ICC::sRGB_curve());
VERIFY(sRGB_curve_pointer->type() == Gfx::ICC::ParametricCurveTagData::Type);
auto const& sRGB_curve = static_cast<Gfx::ICC::ParametricCurveTagData const&>(*sRGB_curve_pointer);
EXPECT_EQ(sRGB_curve.evaluate(0.f), 0.f);
EXPECT_EQ(sRGB_curve.evaluate(1.f), 1.f);
auto xyz_from_sRGB = [sRGB](u8 r, u8 g, u8 b) {
u8 rgb[3] = { r, g, b };
return MUST(sRGB->to_pcs(rgb));
};
auto vec3_from_xyz = [](Gfx::ICC::XYZ const& xyz) {
return FloatVector3 { xyz.x, xyz.y, xyz.z };
};
#define EXPECT_APPROXIMATE_VECTOR3(v1, v2) \
EXPECT_APPROXIMATE((v1)[0], (v2)[0]); \
EXPECT_APPROXIMATE((v1)[1], (v2)[1]); \
EXPECT_APPROXIMATE((v1)[2], (v2)[2]);
// At 0 and 255, the gamma curve is (exactly) 0 and 1, so these just test the matrix part.
EXPECT_APPROXIMATE_VECTOR3(xyz_from_sRGB(0, 0, 0), FloatVector3(0, 0, 0));
auto r_xyz = vec3_from_xyz(sRGB->red_matrix_column());
EXPECT_APPROXIMATE_VECTOR3(xyz_from_sRGB(255, 0, 0), r_xyz);
auto g_xyz = vec3_from_xyz(sRGB->green_matrix_column());
EXPECT_APPROXIMATE_VECTOR3(xyz_from_sRGB(0, 255, 0), g_xyz);
auto b_xyz = vec3_from_xyz(sRGB->blue_matrix_column());
EXPECT_APPROXIMATE_VECTOR3(xyz_from_sRGB(0, 0, 255), b_xyz);
EXPECT_APPROXIMATE_VECTOR3(xyz_from_sRGB(255, 255, 0), r_xyz + g_xyz);
EXPECT_APPROXIMATE_VECTOR3(xyz_from_sRGB(255, 0, 255), r_xyz + b_xyz);
EXPECT_APPROXIMATE_VECTOR3(xyz_from_sRGB(0, 255, 255), g_xyz + b_xyz);
// FIXME: This should also be equal to sRGB->pcs_illuminant() and to the profiles mediaWhitePointTag,
// but at the moment it's off by a bit too much. See also FIXME in WellKnownProfiles.cpp.
EXPECT_APPROXIMATE_VECTOR3(xyz_from_sRGB(255, 255, 255), r_xyz + g_xyz + b_xyz);
// These test the curve part.
float f64 = sRGB_curve.evaluate(64 / 255.f);
EXPECT_APPROXIMATE_VECTOR3(xyz_from_sRGB(64, 64, 64), (r_xyz + g_xyz + b_xyz) * f64);
float f128 = sRGB_curve.evaluate(128 / 255.f);
EXPECT_APPROXIMATE_VECTOR3(xyz_from_sRGB(128, 128, 128), (r_xyz + g_xyz + b_xyz) * f128);
// Test for curve and matrix combined.
float f192 = sRGB_curve.evaluate(192 / 255.f);
EXPECT_APPROXIMATE_VECTOR3(xyz_from_sRGB(64, 128, 192), r_xyz * f64 + g_xyz * f128 + b_xyz * f192);
}