X-Git-Url: https://git.sesse.net/?p=movit;a=blobdiff_plain;f=blur_effect_test.cpp;fp=blur_effect_test.cpp;h=d458e45d1fe096174ade4c8654c230cfe6edf3fc;hp=0000000000000000000000000000000000000000;hb=ac5f7aa64ab690120a71fe45ee4b9bbc56610191;hpb=f2841411054c60e47181136aafc86b9982bf573e

diff --git a/blur_effect_test.cpp b/blur_effect_test.cpp
new file mode 100644
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--- /dev/null
+++ b/blur_effect_test.cpp
@@ -0,0 +1,97 @@
+// Unit tests for BlurEffect.
+#include <math.h>
+
+#include "test_util.h"
+#include "gtest/gtest.h"
+#include "blur_effect.h"
+
+TEST(BlurEffectTest, 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 *blur_effect = tester.get_chain()->add_effect(new BlurEffect());
+	ASSERT_TRUE(blur_effect->set_float("radius", 0.0f));
+	tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+	expect_equal(data, out_data, size, size);
+}
+
+namespace {
+
+void add_blurred_point(float *out, int size, int x0, int y0, float strength, float sigma)
+{
+	// From http://en.wikipedia.org/wiki/Logistic_distribution#Alternative_parameterization.
+	const float c1 = M_PI / (sigma * 4 * sqrt(3.0f));
+	const float c2 = M_PI / (sigma * 2.0 * sqrt(3.0f));
+
+	for (int y = 0; y < size; ++y) {
+		for (int x = 0; x < size; ++x) {
+			float xd = c2 * (x - x0);
+			float yd = c2 * (y - y0);
+			out[y * size + x] += (strength * c1 * c1) / (cosh(xd) * cosh(xd) * cosh(yd) * cosh(yd));
+		}
+	}
+}
+
+}  // namespace
+
+TEST(BlurEffectTest, BlurTwoDotsSmallRadius) {
+	const float sigma = 3.0f;
+	const int size = 32;
+	const int x1 = 8;
+	const int y1 = 8;
+	const int x2 = 20;
+	const int y2 = 10;
+
+	float data[size * size], out_data[size * size], expected_data[size * size];
+	memset(data, 0, sizeof(data));
+	memset(expected_data, 0, sizeof(expected_data));
+
+	data[y1 * size + x1] = 1.0f;
+	data[y2 * size + x2] = 1.0f;
+
+	add_blurred_point(expected_data, size, x1, y1, 1.0f, sigma);
+	add_blurred_point(expected_data, size, x2, y2, 1.0f, sigma);
+
+	EffectChainTester tester(data, size, size, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
+	Effect *blur_effect = tester.get_chain()->add_effect(new BlurEffect());
+	ASSERT_TRUE(blur_effect->set_float("radius", sigma));
+	tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+	// Set the limits a bit tighter than usual, since there is so little energy in here.
+	expect_equal(expected_data, out_data, size, size, 1e-3, 1e-5);
+}
+
+TEST(BlurEffectTest, BlurTwoDotsLargeRadius) {
+	const float sigma = 20.0f;  // Large enough that we will begin scaling.
+	const int size = 256;
+	const int x1 = 64;
+	const int y1 = 64;
+	const int x2 = 160;
+	const int y2 = 120;
+
+	static float data[size * size], out_data[size * size], expected_data[size * size];
+	memset(data, 0, sizeof(data));
+	memset(expected_data, 0, sizeof(expected_data));
+
+	data[y1 * size + x1] = 128.0f;
+	data[y2 * size + x2] = 128.0f;
+
+	add_blurred_point(expected_data, size, x1, y1, 128.0f, sigma);
+	add_blurred_point(expected_data, size, x2, y2, 128.0f, sigma);
+
+	EffectChainTester tester(data, size, size, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
+	Effect *blur_effect = tester.get_chain()->add_effect(new BlurEffect());
+	ASSERT_TRUE(blur_effect->set_float("radius", sigma));
+	tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+	expect_equal(expected_data, out_data, size, size, 0.1f, 1e-3);
+}