git.sesse.net Git - movit/blob - overlay_effect_test.cpp

   1 // Unit tests for OverlayEffect.
   2
   3 #include <epoxy/gl.h>
   4
   5 #include "effect_chain.h"
   6 #include "gtest/gtest.h"
   7 #include "image_format.h"
   8 #include "input.h"
   9 #include "overlay_effect.h"
  10 #include "test_util.h"
  11 #include "util.h"
  12
  13 namespace movit {
  14
  15 TEST(OverlayEffectTest, TopDominatesBottomWhenNoAlpha) {
  16         for (int swap_inputs = 0; swap_inputs < 2; ++swap_inputs) {  // false, true.
  17                 float data_a[] = {
  18                         0.0f, 0.25f,
  19                         0.75f, 1.0f,
  20                 };
  21                 float data_b[] = {
  22                         1.0f, 0.5f,
  23                         0.75f, 0.6f,
  24                 };
  25                 float out_data[4];
  26                 EffectChainTester tester(data_a, 2, 2, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
  27                 Effect *input1 = tester.get_chain()->last_added_effect();
  28                 Effect *input2 = tester.add_input(data_b, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
  29
  30                 OverlayEffect *effect = new OverlayEffect();
  31                 CHECK(effect->set_int("swap_inputs", swap_inputs));
  32                 tester.get_chain()->add_effect(effect, input1, input2);
  33                 tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
  34
  35                 if (swap_inputs) {
  36                         expect_equal(data_a, out_data, 2, 2);
  37                 } else {
  38                         expect_equal(data_b, out_data, 2, 2);
  39                 }
  40         }
  41 }
  42
  43 TEST(OverlayEffectTest, BottomDominatesTopWhenTopIsTransparent) {
  44         float data_a[] = {
  45                 1.0f, 0.0f, 0.0f, 0.5f,
  46         };
  47         float data_b[] = {
  48                 0.5f, 0.5f, 0.5f, 0.0f,
  49         };
  50         float out_data[4];
  51         EffectChainTester tester(data_a, 1, 1, FORMAT_RGBA_POSTMULTIPLIED_ALPHA, COLORSPACE_sRGB, GAMMA_LINEAR);
  52         Effect *input1 = tester.get_chain()->last_added_effect();
  53         Effect *input2 = tester.add_input(data_b, FORMAT_RGBA_POSTMULTIPLIED_ALPHA, COLORSPACE_sRGB, GAMMA_LINEAR);
  54
  55         tester.get_chain()->add_effect(new OverlayEffect(), input1, input2);
  56         tester.run(out_data, GL_RGBA, COLORSPACE_sRGB, GAMMA_LINEAR);
  57
  58         expect_equal(data_a, out_data, 4, 1);
  59 }
  60
  61 TEST(OverlayEffectTest, ZeroAlphaRemainsZeroAlpha) {
  62         float data_a[] = {
  63                 0.0f, 0.25f, 0.5f, 0.0f
  64         };
  65         float data_b[] = {
  66                 1.0f, 1.0f, 1.0f, 0.0f
  67         };
  68         float expected_data[] = {
  69                 0.0f, 0.0f, 0.0f, 0.0f
  70         };
  71         float out_data[4];
  72         EffectChainTester tester(data_a, 1, 1, FORMAT_RGBA_POSTMULTIPLIED_ALPHA, COLORSPACE_sRGB, GAMMA_LINEAR);
  73         Effect *input1 = tester.get_chain()->last_added_effect();
  74         Effect *input2 = tester.add_input(data_b, FORMAT_RGBA_POSTMULTIPLIED_ALPHA, COLORSPACE_sRGB, GAMMA_LINEAR);
  75
  76         tester.get_chain()->add_effect(new OverlayEffect(), input1, input2);
  77         tester.run(out_data, GL_RGBA, COLORSPACE_sRGB, GAMMA_LINEAR);
  78
  79         EXPECT_FLOAT_EQ(0.0f, expected_data[3]);
  80 }
  81
  82 // This is tested against what Photoshop does: (255,0,128, 0.25) over (128,255,0, 0.5)
  83 // becomes (179,153,51, 0.63). (Actually we fudge 0.63 to 0.625, because that's
  84 // what it should be.)
  85 TEST(OverlayEffectTest, PhotoshopReferenceTest) {
  86         float data_a[] = {
  87                 128.0f/255.0f, 1.0f, 0.0f, 0.5f
  88         };
  89         float data_b[] = {
  90                 1.0f, 0.0f, 128.0f/255.0f, 0.25f
  91         };
  92         float expected_data[] = {
  93                 179.0f/255.0f, 153.0f/255.0f, 51.0f/255.0f, 0.625f
  94         };
  95         float out_data[4];
  96         EffectChainTester tester(data_a, 1, 1, FORMAT_RGBA_POSTMULTIPLIED_ALPHA, COLORSPACE_sRGB, GAMMA_LINEAR);
  97         Effect *input1 = tester.get_chain()->last_added_effect();
  98         Effect *input2 = tester.add_input(data_b, FORMAT_RGBA_POSTMULTIPLIED_ALPHA, COLORSPACE_sRGB, GAMMA_LINEAR);
  99
 100         tester.get_chain()->add_effect(new OverlayEffect(), input1, input2);
 101         tester.run(out_data, GL_RGBA, COLORSPACE_sRGB, GAMMA_LINEAR);
 102
 103         expect_equal(expected_data, out_data, 4, 1);
 104 }
 105
 106 }  // namespace movit