1 // Unit tests for GlowEffect.
6 #include "effect_chain.h"
7 #include "glow_effect.h"
8 #include "gtest/gtest.h"
9 #include "image_format.h"
10 #include "test_util.h"
12 TEST(GlowEffectTest, NoAmountDoesNothing) {
15 float data[size * size] = {
21 float out_data[size * size];
23 EffectChainTester tester(data, size, size, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
24 Effect *glow_effect = tester.get_chain()->add_effect(new GlowEffect());
25 ASSERT_TRUE(glow_effect->set_float("radius", 2.0f));
26 ASSERT_TRUE(glow_effect->set_float("blurred_mix_amount", 0.0f));
27 tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
29 expect_equal(data, out_data, size, size);
32 TEST(GlowEffectTest, SingleDot) {
34 const float sigma = 0.5f;
35 const float amount = 0.2f;
37 float data[] = { // One single dot in the middle.
38 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,
39 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,
40 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,
41 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,
42 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,
43 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,
44 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,
45 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,
46 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,
47 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,
48 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,
49 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,
50 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,
52 float expected_data[size * size], out_data[size * size];
54 // The output should be equal to the input, plus approximately a logistic blob.
55 // From http://en.wikipedia.org/wiki/Logistic_distribution#Alternative_parameterization.
56 const float c1 = M_PI / (sigma * 4 * sqrt(3.0f));
57 const float c2 = M_PI / (sigma * 2.0 * sqrt(3.0f));
59 for (int y = 0; y < size; ++y) {
60 for (int x = 0; x < size; ++x) {
61 float xd = c2 * (x - 6);
62 float yd = c2 * (y - 6);
63 expected_data[y * size + x] = data[y * size + x] +
64 (amount * c1 * c1) / (cosh(xd) * cosh(xd) * cosh(yd) * cosh(yd));
68 EffectChainTester tester(data, size, size, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
69 Effect *glow_effect = tester.get_chain()->add_effect(new GlowEffect());
70 ASSERT_TRUE(glow_effect->set_float("radius", sigma));
71 ASSERT_TRUE(glow_effect->set_float("blurred_mix_amount", amount));
72 tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
74 expect_equal(expected_data, out_data, size, size, 0.1f, 1e-3);
77 TEST(GlowEffectTest, GlowsOntoZeroAlpha) {
79 const float sigma = 1.0f;
80 const float amount = 1.0f;
82 float data[4 * size] = {
91 float expected_data[4 * size] = {
101 float out_data[4 * size];
103 EffectChainTester tester(data, 1, size, FORMAT_RGBA_POSTMULTIPLIED_ALPHA, COLORSPACE_sRGB, GAMMA_LINEAR);
104 Effect *glow_effect = tester.get_chain()->add_effect(new GlowEffect());
105 ASSERT_TRUE(glow_effect->set_float("radius", sigma));
106 ASSERT_TRUE(glow_effect->set_float("blurred_mix_amount", amount));
107 tester.run(out_data, GL_RGBA, COLORSPACE_sRGB, GAMMA_LINEAR);
109 expect_equal(expected_data, out_data, 4, size);