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ICC: Implement TRC inversion in from_pcs for parametric curves

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This commit is contained in:
Nico Weber 2023-05-01 11:14:10 -04:00 • committed by Sam Atkins
parent 4169c94ebe
commit 9bd35fda56
3 changed files with 71 additions and 8 deletions
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15
Tests/LibGfx/TestICCProfile.cpp
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@ -158,6 +158,10 @@ TEST_CASE(from_pcs)
{
auto sRGB = MUST(Gfx::ICC::sRGB());
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);
auto sRGB_from_xyz = [&sRGB](FloatVector3 const& XYZ) {
u8 rgb[3];
MUST(sRGB->from_pcs(XYZ, rgb));
@ -185,7 +189,16 @@ TEST_CASE(from_pcs)
EXPECT_EQ(sRGB_from_xyz(g_xyz + b_xyz), Color(0, 255, 255));
EXPECT_EQ(sRGB_from_xyz(r_xyz + g_xyz + b_xyz), Color(255, 255, 255));
// FIXME: Implement and test the inverse curve transform.
// Test the inverse curve transform.
float f64 = sRGB_curve.evaluate(64 / 255.f);
EXPECT_EQ(sRGB_from_xyz((r_xyz + g_xyz + b_xyz) * f64), Color(64, 64, 64));
float f128 = sRGB_curve.evaluate(128 / 255.f);
EXPECT_EQ(sRGB_from_xyz((r_xyz + g_xyz + b_xyz) * f128), Color(128, 128, 128));
// Test for curve and matrix combined.
float f192 = sRGB_curve.evaluate(192 / 255.f);
EXPECT_EQ(sRGB_from_xyz(r_xyz * f64 + g_xyz * f128 + b_xyz * f192), Color(64, 128, 192));
}
TEST_CASE(to_lab)