1 // Unit tests for GlowEffect.
5 #include "effect_chain.h"
6 #include "glow_effect.h"
7 #include "gtest/gtest.h"
8 #include "image_format.h"
11 TEST(GlowEffectTest, NoAmountDoesNothing) {
14 float data[size * size] = {
20 float out_data[size * size];
22 EffectChainTester tester(data, size, size, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
23 Effect *glow_effect = tester.get_chain()->add_effect(new GlowEffect());
24 ASSERT_TRUE(glow_effect->set_float("radius", 2.0f));
25 ASSERT_TRUE(glow_effect->set_float("blurred_mix_amount", 0.0f));
26 tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
28 expect_equal(data, out_data, size, size);
31 TEST(GlowEffectTest, SingleDot) {
33 const float sigma = 0.5f;
34 const float amount = 0.2f;
36 float data[] = { // One single dot in the middle.
37 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,
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, 1.0, 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, 0.0, 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,
51 float expected_data[size * size], out_data[size * size];
53 // The output should be equal to the input, plus approximately a logistic blob.
54 // From http://en.wikipedia.org/wiki/Logistic_distribution#Alternative_parameterization.
55 const float c1 = M_PI / (sigma * 4 * sqrt(3.0f));
56 const float c2 = M_PI / (sigma * 2.0 * sqrt(3.0f));
58 for (int y = 0; y < size; ++y) {
59 for (int x = 0; x < size; ++x) {
60 float xd = c2 * (x - 6);
61 float yd = c2 * (y - 6);
62 expected_data[y * size + x] = data[y * size + x] +
63 (amount * c1 * c1) / (cosh(xd) * cosh(xd) * cosh(yd) * cosh(yd));
67 EffectChainTester tester(data, size, size, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
68 Effect *glow_effect = tester.get_chain()->add_effect(new GlowEffect());
69 ASSERT_TRUE(glow_effect->set_float("radius", sigma));
70 ASSERT_TRUE(glow_effect->set_float("blurred_mix_amount", amount));
71 tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
73 expect_equal(expected_data, out_data, size, size, 0.1f, 1e-3);
76 TEST(GlowEffectTest, GlowsOntoZeroAlpha) {
78 const float sigma = 1.0f;
79 const float amount = 1.0f;
81 float data[4 * size] = {
90 float expected_data[4 * size] = {
100 float out_data[4 * size];
102 EffectChainTester tester(data, 1, size, FORMAT_RGBA_POSTMULTIPLIED_ALPHA, COLORSPACE_sRGB, GAMMA_LINEAR);
103 Effect *glow_effect = tester.get_chain()->add_effect(new GlowEffect());
104 ASSERT_TRUE(glow_effect->set_float("radius", sigma));
105 ASSERT_TRUE(glow_effect->set_float("blurred_mix_amount", amount));
106 tester.run(out_data, GL_RGBA, COLORSPACE_sRGB, GAMMA_LINEAR);
108 expect_equal(expected_data, out_data, 4, size);