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LibGfx/ICC: Fastpath for matrix->matrix image conversions

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Doesn't help with PDF at all since that doesn't call convert_image()
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This commit is contained in:
Nico Weber 2024-01-08 18:12:15 -05:00 • committed by Andreas Kling
parent 7772637d03
commit 2fc6ec0f46
2 changed files with 78 additions and 0 deletions
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76
Userland/Libraries/LibGfx/ICC/Profile.cpp
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@ -1571,8 +1571,84 @@ ErrorOr<CIELAB> Profile::to_lab(ReadonlyBytes color) const
return CIELAB { lab[0], lab[1], lab[2] };
}
bool Profile::is_matrix_matrix_conversion(Profile const& source_profile) const
{
auto has_normal_device_class = [](DeviceClass device) {
return device == DeviceClass::InputDevice
|| device == DeviceClass::DisplayDevice
|| device == DeviceClass::OutputDevice
|| device == DeviceClass::ColorSpace;
};
return has_normal_device_class(device_class())
&& has_normal_device_class(source_profile.device_class())
&& connection_space() == ColorSpace::PCSXYZ
&& source_profile.connection_space() == ColorSpace::PCSXYZ
&& data_color_space() == ColorSpace::RGB
&& source_profile.data_color_space() == ColorSpace::RGB
&& !m_cached_has_any_a_to_b_tag
&& !source_profile.m_cached_has_any_a_to_b_tag
&& m_cached_has_all_rgb_matrix_tags
&& source_profile.m_cached_has_all_rgb_matrix_tags;
}
ErrorOr<void> Profile::convert_image_matrix_matrix(Gfx::Bitmap& bitmap, Profile const& source_profile) const
{
auto const& sourceRedTRC = *source_profile.m_tag_table.get(redTRCTag).value();
auto const& sourceGreenTRC = *source_profile.m_tag_table.get(greenTRCTag).value();
auto const& sourceBlueTRC = *source_profile.m_tag_table.get(blueTRCTag).value();
auto evaluate_curve = [](TagData const& trc, float f) {
VERIFY(trc.type() == CurveTagData::Type || trc.type() == ParametricCurveTagData::Type);
if (trc.type() == CurveTagData::Type)
return static_cast<CurveTagData const&>(trc).evaluate(f);
return static_cast<ParametricCurveTagData const&>(trc).evaluate(f);
};
FloatMatrix3x3 matrix = source_profile.rgb_to_xyz_matrix() * TRY(xyz_to_rgb_matrix());
auto const& destinationRedTRC = *m_tag_table.get(redTRCTag).value();
auto const& destinationGreenTRC = *m_tag_table.get(greenTRCTag).value();
auto const& destinationBlueTRC = *m_tag_table.get(blueTRCTag).value();
auto evaluate_curve_inverse = [](TagData const& trc, float f) {
VERIFY(trc.type() == CurveTagData::Type || trc.type() == ParametricCurveTagData::Type);
if (trc.type() == CurveTagData::Type)
return static_cast<CurveTagData const&>(trc).evaluate_inverse(f);
return static_cast<ParametricCurveTagData const&>(trc).evaluate_inverse(f);
};
for (auto& pixel : bitmap) {
FloatVector3 rgb { (float)Color::from_argb(pixel).red(), (float)Color::from_argb(pixel).green(), (float)Color::from_argb(pixel).blue() };
rgb = rgb / 255.0f;
FloatVector3 linear_rgb = {
evaluate_curve(sourceRedTRC, rgb[0]),
evaluate_curve(sourceGreenTRC, rgb[1]),
evaluate_curve(sourceBlueTRC, rgb[2]),
};
linear_rgb = matrix * linear_rgb;
linear_rgb.clamp(0.f, 1.f);
float device_r = evaluate_curve_inverse(destinationRedTRC, linear_rgb[0]);
float device_g = evaluate_curve_inverse(destinationGreenTRC, linear_rgb[1]);
float device_b = evaluate_curve_inverse(destinationBlueTRC, linear_rgb[2]);
u8 out_r = round(255 * device_r);
u8 out_g = round(255 * device_g);
u8 out_b = round(255 * device_b);
pixel = Color(out_r, out_g, out_b, Color::from_argb(pixel).alpha()).value();
}
return {};
}
ErrorOr<void> Profile::convert_image(Gfx::Bitmap& bitmap, Profile const& source_profile) const
{
if (is_matrix_matrix_conversion(source_profile))
return convert_image_matrix_matrix(bitmap, source_profile);
for (auto& pixel : bitmap) {
u8 rgb[] = { Color::from_argb(pixel).red(), Color::from_argb(pixel).green(), Color::from_argb(pixel).blue() };
auto pcs = TRY(source_profile.to_pcs(rgb));