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Add stroke alpha blend reference tests

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This commit is contained in:
omigamedev
2026-06-02 17:23:44 +02:00
parent 995752da75
commit 8c0784f9c3
6 changed files with 194 additions and 7 deletions
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38
tests/paint/blend_tests.cpp
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@@ -6,8 +6,11 @@
using pp::paint::BlendMode;
using pp::paint::Rgba;
using pp::paint::StrokeBlendMode;
using pp::paint::blend_mode_name;
using pp::paint::blend_pixels;
using pp::paint::blend_stroke_alpha;
using pp::paint::stroke_blend_mode_name;
namespace {
@@ -91,6 +94,39 @@ void clamps_inputs_and_names_modes(pp::tests::Harness& h)
PP_EXPECT(h, blend_mode_name(BlendMode::overlay) == std::string_view("overlay"));
}
void stroke_alpha_blend_modes_match_shader_reference_vectors(pp::tests::Harness& h)
{
PP_EXPECT(h, near(blend_stroke_alpha(0.2F, 0.8F, 0.25F, StrokeBlendMode::normal), 0.35F));
PP_EXPECT(h, near(blend_stroke_alpha(0.6F, 0.5F, 1.0F, StrokeBlendMode::multiply), 0.3F));
PP_EXPECT(h, near(blend_stroke_alpha(0.6F, 0.2F, 1.0F, StrokeBlendMode::subtract), 0.4F));
PP_EXPECT(h, near(blend_stroke_alpha(0.6F, 0.2F, 1.0F, StrokeBlendMode::darken), 0.2F));
PP_EXPECT(h, near(blend_stroke_alpha(0.75F, 0.25F, 1.0F, StrokeBlendMode::overlay), 0.625F));
PP_EXPECT(h, near(blend_stroke_alpha(0.4F, 0.5F, 1.0F, StrokeBlendMode::color_dodge), 0.8F));
PP_EXPECT(h, near(blend_stroke_alpha(0.6F, 0.5F, 1.0F, StrokeBlendMode::color_burn), 0.2F));
PP_EXPECT(h, near(blend_stroke_alpha(0.75F, 0.5F, 1.0F, StrokeBlendMode::linear_burn), 0.25F));
PP_EXPECT(h, near(blend_stroke_alpha(0.2F, 0.2F, 1.0F, StrokeBlendMode::hard_mix), 0.0F));
PP_EXPECT(h, near(blend_stroke_alpha(0.7F, 0.8F, 1.0F, StrokeBlendMode::hard_mix), 1.0F));
PP_EXPECT(h, near(blend_stroke_alpha(0.5F, 0.25F, 0.16F, StrokeBlendMode::linear_height), 0.637170F));
PP_EXPECT(h, near(blend_stroke_alpha(0.5F, 0.25F, 0.16F, StrokeBlendMode::height), 0.228217F));
}
void stroke_alpha_blend_modes_handle_edges_and_names(pp::tests::Harness& h)
{
PP_EXPECT(h, near(blend_stroke_alpha(0.8F, 0.2F, 0.0F, StrokeBlendMode::multiply), 0.8F));
PP_EXPECT(h, near(blend_stroke_alpha(0.0F, 0.8F, 1.0F, StrokeBlendMode::color_dodge), 0.0F));
PP_EXPECT(h, near(blend_stroke_alpha(0.8F, 1.0F, 1.0F, StrokeBlendMode::color_dodge), 1.0F));
PP_EXPECT(h, near(blend_stroke_alpha(1.0F, 0.2F, 1.0F, StrokeBlendMode::color_burn), 1.0F));
PP_EXPECT(h, near(blend_stroke_alpha(0.8F, 0.0F, 1.0F, StrokeBlendMode::color_burn), 0.0F));
PP_EXPECT(h, near(blend_stroke_alpha(0.0F, 1.0F, 1.0F, StrokeBlendMode::hard_mix), 0.0F));
PP_EXPECT(h, near(blend_stroke_alpha(-1.0F, 2.0F, 2.0F, StrokeBlendMode::normal), 1.0F));
PP_EXPECT(h, near(blend_stroke_alpha(0.2F, 0.2F, 0.5F, static_cast<StrokeBlendMode>(255)), 1.0F));
PP_EXPECT(h, stroke_blend_mode_name(StrokeBlendMode::normal) == std::string_view("normal"));
PP_EXPECT(h, stroke_blend_mode_name(StrokeBlendMode::linear_height) == std::string_view("linear_height"));
PP_EXPECT(h, stroke_blend_mode_name(StrokeBlendMode::height) == std::string_view("height"));
PP_EXPECT(h, stroke_blend_mode_name(static_cast<StrokeBlendMode>(255)) == std::string_view("unknown"));
}
}
int main()
@@ -101,5 +137,7 @@ int main()
harness.run("multiply_and_screen_are_bounded", multiply_and_screen_are_bounded);
harness.run("color_dodge_and_overlay_handle_extremes", color_dodge_and_overlay_handle_extremes);
harness.run("clamps_inputs_and_names_modes", clamps_inputs_and_names_modes);
harness.run("stroke_alpha_blend_modes_match_shader_reference_vectors", stroke_alpha_blend_modes_match_shader_reference_vectors);
harness.run("stroke_alpha_blend_modes_handle_edges_and_names", stroke_alpha_blend_modes_handle_edges_and_names);
return harness.finish();
}