Add a unit test for DiffusionEffect.

[movit] / diffusion_effect_test.cpp

diff --git a/diffusion_effect_test.cpp b/diffusion_effect_test.cpp
new file mode 100644 (file)
index 0000000..446a51f
--- /dev/null
+++ b/diffusion_effect_test.cpp
@@ -0,0 +1,60 @@
+// Unit tests for DiffusionEffect.
+
+#include "test_util.h"
+#include "gtest/gtest.h"
+#include "diffusion_effect.h"
+
+TEST(DiffusionEffectTest, IdentityTransformDoesNothing) {
+       const int size = 4;
+
+       float data[size * size] = {
+               0.0, 1.0, 0.0, 1.0,
+               0.0, 1.0, 1.0, 0.0,
+               0.0, 0.5, 1.0, 0.5,
+               0.0, 0.0, 0.0, 0.0,
+       };
+       float out_data[size * size];
+
+       EffectChainTester tester(data, size, size, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
+       Effect *diffusion_effect = tester.get_chain()->add_effect(new DiffusionEffect());
+       ASSERT_TRUE(diffusion_effect->set_float("radius", 0.0f));
+       tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+       expect_equal(data, out_data, size, size);
+}
+
+TEST(DiffusionEffectTest, FlattensOutWhitePyramid) {
+       const int size = 9;
+
+       float data[size * size] = {
+               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, 0.0, 0.0, 0.0, 0.0, 0.0,
+               0.0, 0.0, 0.5, 0.5, 0.5, 0.5, 0.5, 0.0, 0.0,
+               0.0, 0.0, 0.5, 0.7, 0.7, 0.7, 0.5, 0.0, 0.0,
+               0.0, 0.0, 0.5, 0.7, 1.0, 0.7, 0.5, 0.0, 0.0,
+               0.0, 0.0, 0.5, 0.7, 0.7, 0.7, 0.5, 0.0, 0.0,
+               0.0, 0.0, 0.5, 0.5, 0.5, 0.5, 0.5, 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, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,
+       };
+       float expected_data[size * size] = {
+               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, 0.0, 0.0, 0.0, 0.0, 0.0,
+               0.0, 0.0, 0.4, 0.4, 0.4, 0.4, 0.4, 0.0, 0.0,
+               0.0, 0.0, 0.4, 0.5, 0.5, 0.5, 0.4, 0.0, 0.0,
+               0.0, 0.0, 0.4, 0.5, 0.6, 0.5, 0.4, 0.0, 0.0,
+               0.0, 0.0, 0.4, 0.5, 0.5, 0.5, 0.4, 0.0, 0.0,
+               0.0, 0.0, 0.4, 0.4, 0.4, 0.4, 0.4, 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, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,
+       };
+       float out_data[size * size];
+
+       EffectChainTester tester(data, size, size, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
+       Effect *diffusion_effect = tester.get_chain()->add_effect(new DiffusionEffect());
+       ASSERT_TRUE(diffusion_effect->set_float("radius", 2.0f));
+       ASSERT_TRUE(diffusion_effect->set_float("blurred_mix_amount", 0.7f));
+       tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+       expect_equal(expected_data, out_data, size, size, 0.05f, 0.002);
+}