Add a unit test for full-range Rec. 601 YCbCr.
authorSteinar H. Gunderson <sgunderson@bigfoot.com>
Sun, 14 Oct 2012 23:57:51 +0000 (01:57 +0200)
committerSteinar H. Gunderson <sgunderson@bigfoot.com>
Sun, 14 Oct 2012 23:57:51 +0000 (01:57 +0200)
ycbcr_input_test.cpp

index 0a0ec69..53b8289 100644 (file)
@@ -55,3 +55,55 @@ TEST(YCbCrInput, Simple444) {
        // so we need some leeway.
        expect_equal(expected_data, out_data, 4 * width, height, 0.025, 0.002);
 }
+
+TEST(YCbCrInput, FullRangeRec601) {
+       const int width = 1;
+       const int height = 5;
+
+       // Pure-color test inputs, calculated with the formulas in Rec. 601
+       // section 2.5.4 but without the scaling factors applied
+       // (so both R, G, B, Y, Cb and R vary from 0 to 255).
+       unsigned char y[width * height] = {
+               0, 255, 76, 150, 29,
+       };
+       unsigned char cb[width * height] = {
+               128, 128, 85, 44, 255,
+       };
+       unsigned char cr[width * height] = {
+               128, 128, 255, 21, 107,
+       };
+       float expected_data[4 * width * height] = {
+               0.0, 0.0, 0.0, 1.0,
+               1.0, 1.0, 1.0, 1.0,
+               1.0, 0.0, 0.0, 1.0,
+               0.0, 1.0, 0.0, 1.0,
+               0.0, 0.0, 1.0, 1.0,
+       };
+       float out_data[4 * width * height];
+
+       EffectChainTester tester(NULL, width, height);
+
+       ImageFormat format;
+       format.color_space = COLORSPACE_sRGB;
+       format.gamma_curve = GAMMA_sRGB;
+
+       YCbCrFormat ycbcr_format;
+       ycbcr_format.luma_coefficients = YCBCR_REC_601;
+       ycbcr_format.full_range = true;
+       ycbcr_format.chroma_subsampling_x = 1;
+       ycbcr_format.chroma_subsampling_y = 1;
+       ycbcr_format.chroma_x_position = 0.5f;
+       ycbcr_format.chroma_y_position = 0.5f;
+
+       YCbCrInput *input = new YCbCrInput(format, ycbcr_format, width, height);
+       input->set_pixel_data(0, y);
+       input->set_pixel_data(1, cb);
+       input->set_pixel_data(2, cr);
+       tester.get_chain()->add_input(input);
+
+       tester.run(out_data, GL_RGBA, COLORSPACE_sRGB, GAMMA_sRGB);
+
+       // Y'CbCr isn't 100% accurate (the input values are rounded),
+       // so we need some leeway.
+       expect_equal(expected_data, out_data, 4 * width, height, 0.025, 0.002);
+}