Add support for offsets in ResampleEffect.

[movit] / resample_effect_test.cpp

diff --git a/resample_effect_test.cpp b/resample_effect_test.cpp
index 95c2bcfb9aec95693653ea65572cfdca76f79699..e4b9439ffffad9211c9b1c99d91e544e5e1a1fe0 100644 (file)
--- a/resample_effect_test.cpp
+++ b/resample_effect_test.cpp
@@ -208,4 +208,100 @@ TEST(ResampleEffectTest, HeavyResampleGetsSumRight) {
        expect_equal(expected_data, out_data, dwidth, dheight, 0.1 / 1023.0);
 }
 
+TEST(ResampleEffectTest, ReadWholePixelFromLeft) {
+       const int size = 5;
+
+       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, 1.0, 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, 1.0, 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 *resample_effect = tester.get_chain()->add_effect(new ResampleEffect());
+       ASSERT_TRUE(resample_effect->set_int("width", size));
+       ASSERT_TRUE(resample_effect->set_int("height", size));
+       ASSERT_TRUE(resample_effect->set_float("left", 1.0f));
+       tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+       expect_equal(expected_data, out_data, size, size);
+}
+
+TEST(ResampleEffectTest, ReadQuarterPixelFromLeft) {
+       const int size = 5;
+
+       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, 1.0, 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,
+
+               // sin(x*pi)/(x*pi) * sin(x*pi/3)/(x*pi/3) for
+               // x = -1.75, -0.75, 0.25, 1.25, 2.25.
+               // Note that the weight is mostly on the left side.
+               -0.06779, 0.27019, 0.89007, -0.13287, 0.03002,
+
+               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 *resample_effect = tester.get_chain()->add_effect(new ResampleEffect());
+       ASSERT_TRUE(resample_effect->set_int("width", size));
+       ASSERT_TRUE(resample_effect->set_int("height", size));
+       ASSERT_TRUE(resample_effect->set_float("left", 0.25f));
+       tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+       expect_equal(expected_data, out_data, size, size);
+}
+
+TEST(ResampleEffectTest, ReadQuarterPixelFromTop) {
+       const int width = 3;
+       const int height = 5;
+
+       float data[width * height] = {
+               0.0, 0.0, 0.0,
+               0.0, 0.0, 0.0,
+               1.0, 0.0, 0.0,
+               0.0, 0.0, 0.0,
+               0.0, 0.0, 0.0,
+       };
+
+       // See ReadQuarterPixelFromLeft for explanation of the data.
+       float expected_data[width * height] = {
+               -0.06779, 0.0, 0.0,
+                0.27019, 0.0, 0.0,
+                0.89007, 0.0, 0.0,
+               -0.13287, 0.0, 0.0,
+                0.03002, 0.0, 0.0,
+       };
+       float out_data[width * height];
+
+       EffectChainTester tester(data, width, height, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR);
+       Effect *resample_effect = tester.get_chain()->add_effect(new ResampleEffect());
+       ASSERT_TRUE(resample_effect->set_int("width", width));
+       ASSERT_TRUE(resample_effect->set_int("height", height));
+       ASSERT_TRUE(resample_effect->set_float("top", 0.25f));
+       tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR);
+
+       expect_equal(expected_data, out_data, width, height);
+}
+
 }  // namespace movit