1 // Unit tests for OverlayEffect.
5 #include "effect_chain.h"
6 #include "gtest/gtest.h"
7 #include "image_format.h"
9 #include "overlay_effect.h"
10 #include "test_util.h"
12 TEST(OverlayEffectTest, TopDominatesBottomWhenNoAlpha) {
22 EffectChainTester tester(data_a, 2, 2, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
23 Effect *input1 = tester.get_chain()->last_added_effect();
24 Effect *input2 = tester.add_input(data_b, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
26 tester.get_chain()->add_effect(new OverlayEffect(), input1, input2);
27 tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
29 expect_equal(data_b, out_data, 2, 2);
32 TEST(OverlayEffectTest, BottomDominatesTopWhenTopIsTransparent) {
34 1.0f, 0.0f, 0.0f, 0.5f,
37 0.5f, 0.5f, 0.5f, 0.0f,
40 EffectChainTester tester(data_a, 1, 1, FORMAT_BGRA_POSTMULTIPLIED_ALPHA, COLORSPACE_sRGB, GAMMA_LINEAR);
41 Effect *input1 = tester.get_chain()->last_added_effect();
42 Effect *input2 = tester.add_input(data_b, FORMAT_BGRA_POSTMULTIPLIED_ALPHA, COLORSPACE_sRGB, GAMMA_LINEAR);
44 tester.get_chain()->add_effect(new OverlayEffect(), input1, input2);
45 tester.run(out_data, GL_BGRA, COLORSPACE_sRGB, GAMMA_LINEAR);
47 expect_equal(data_a, out_data, 4, 1);
50 TEST(OverlayEffectTest, ZeroAlphaRemainsZeroAlpha) {
52 0.0f, 0.25f, 0.5f, 0.0f
55 1.0f, 1.0f, 1.0f, 0.0f
57 float expected_data[] = {
58 0.0f, 0.0f, 0.0f, 0.0f
61 EffectChainTester tester(data_a, 1, 1, FORMAT_BGRA_POSTMULTIPLIED_ALPHA, COLORSPACE_sRGB, GAMMA_LINEAR);
62 Effect *input1 = tester.get_chain()->last_added_effect();
63 Effect *input2 = tester.add_input(data_b, FORMAT_BGRA_POSTMULTIPLIED_ALPHA, COLORSPACE_sRGB, GAMMA_LINEAR);
65 tester.get_chain()->add_effect(new OverlayEffect(), input1, input2);
66 tester.run(out_data, GL_BGRA, COLORSPACE_sRGB, GAMMA_LINEAR);
68 EXPECT_FLOAT_EQ(0.0f, expected_data[3]);
71 // This is tested against what Photoshop does: (255,0,128, 0.25) over (128,255,0, 0.5)
72 // becomes (179,153,51, 0.63). (Actually we fudge 0.63 to 0.625, because that's
73 // what it should be.)
74 TEST(OverlayEffectTest, PhotoshopReferenceTest) {
76 128.0f/255.0f, 1.0f, 0.0f, 0.5f
79 1.0f, 0.0f, 128.0f/255.0f, 0.25f
81 float expected_data[] = {
82 179.0f/255.0f, 153.0f/255.0f, 51.0f/255.0f, 0.625f
85 EffectChainTester tester(data_a, 1, 1, FORMAT_BGRA_POSTMULTIPLIED_ALPHA, COLORSPACE_sRGB, GAMMA_LINEAR);
86 Effect *input1 = tester.get_chain()->last_added_effect();
87 Effect *input2 = tester.add_input(data_b, FORMAT_BGRA_POSTMULTIPLIED_ALPHA, COLORSPACE_sRGB, GAMMA_LINEAR);
89 tester.get_chain()->add_effect(new OverlayEffect(), input1, input2);
90 tester.run(out_data, GL_BGRA, COLORSPACE_sRGB, GAMMA_LINEAR);
92 expect_equal(expected_data, out_data, 4, 1);