Add a unit test for VignetteEffect, and fix two bugs.

[movit] / vignette_effect_test.cpp

diff --git a/vignette_effect_test.cpp b/vignette_effect_test.cpp
new file mode 100644 (file)
index 0000000..ecd52b5
--- /dev/null
+++ b/vignette_effect_test.cpp
@@ -0,0 +1,92 @@
+// Unit tests for VignetteEffect.
+
+#include <math.h>
+
+#include "effect_chain.h"
+#include "vignette_effect.h"
+#include "gtest/gtest.h"
+#include "image_format.h"
+#include "test_util.h"
+
+TEST(VignetteEffectTest, HugeInnerRadiusDoesNothing) {
+       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 *vignette_effect = tester.get_chain()->add_effect(new VignetteEffect());
+       ASSERT_TRUE(vignette_effect->set_float("inner_radius", 10.0f));
+       tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+       expect_equal(data, out_data, size, size);
+}
+
+TEST(VignetteEffectTest, HardCircle) {
+       const int size = 16;
+
+       float data[size * size], out_data[size * size], expected_data[size * size];
+       for (int y = 0; y < size; ++y) {
+               for (int x = 0; x < size; ++x) {
+                       data[y * size + x] = 1.0f;
+               }
+       }
+       for (int y = 0; y < size; ++y) {
+               const float yf = (y + 0.5f) / size;
+               for (int x = 0; x < size; ++x) {
+                       const float xf = (x + 0.5f) / size;
+                       if (hypot(xf - 0.5, yf - 0.5) < 0.3) {
+                               expected_data[y * size + x] = 1.0f;
+                       } else {
+                               expected_data[y * size + x] = 0.0f;
+                       }
+               }
+       }
+
+       EffectChainTester tester(data, size, size, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
+       Effect *vignette_effect = tester.get_chain()->add_effect(new VignetteEffect());
+       ASSERT_TRUE(vignette_effect->set_float("radius", 0.0f));
+       ASSERT_TRUE(vignette_effect->set_float("inner_radius", 0.3f));
+       tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+       expect_equal(expected_data, out_data, size, size);
+}
+
+TEST(VignetteEffectTest, BurstFromUpperLeftCorner) {
+       const int width = 16, height = 24;
+       float radius = 0.5f;
+
+       float data[width * height], out_data[width * height], expected_data[width * height];
+       for (int y = 0; y < height; ++y) {
+               for (int x = 0; x < width; ++x) {
+                       data[y * width + x] = 1.0f;
+               }
+       }
+       for (int y = 0; y < height; ++y) {
+               const float yf = (y + 0.5f) / width;  // Note: Division by width.
+               for (int x = 0; x < width; ++x) {
+                       const float xf = (x + 0.5f) / width;
+                       const float d = hypot(xf, yf) / radius;
+                       if (d >= 1.0f) {
+                               expected_data[y * width + x] = 0.0f;
+                       } else {
+                               expected_data[y * width + x] = cos(d * 0.5 * M_PI) * cos(d * 0.5 * M_PI);
+                       }
+               }
+       }
+
+       EffectChainTester tester(data, width, height, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
+       Effect *vignette_effect = tester.get_chain()->add_effect(new VignetteEffect());
+       float center[] = { 0.0f, 0.0f };
+       ASSERT_TRUE(vignette_effect->set_vec2("center", center));
+       ASSERT_TRUE(vignette_effect->set_float("radius", radius));
+       ASSERT_TRUE(vignette_effect->set_float("inner_radius", 0.0f));
+       tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+       expect_equal(expected_data, out_data, width, height);
+}