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

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