Add a unit test for Rec. 709 YCbCr.
authorSteinar H. Gunderson <sgunderson@bigfoot.com>
Mon, 15 Oct 2012 18:49:11 +0000 (20:49 +0200)
committerSteinar H. Gunderson <sgunderson@bigfoot.com>
Mon, 15 Oct 2012 18:49:11 +0000 (20:49 +0200)
ycbcr_input_test.cpp

index 70cbc12..7b2a6fd 100644 (file)
@@ -108,6 +108,57 @@ TEST(YCbCrInput, FullRangeRec601) {
        expect_equal(expected_data, out_data, 4 * width, height, 0.025, 0.002);
 }
 
+TEST(YCbCrInput, Rec709) {
+       const int width = 1;
+       const int height = 5;
+
+       // Pure-color test inputs, calculated with the formulas in Rec. 709
+       // page 19, items 3.4 and 3.5.
+       unsigned char y[width * height] = {
+               16, 235, 63, 173, 32, 
+       };
+       unsigned char cb[width * height] = {
+               128, 128, 102, 42, 240,
+       };
+       unsigned char cr[width * height] = {
+               128, 128, 240, 26, 118,
+       };
+       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_709;
+       ycbcr_format.full_range = false;
+       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);
+}
+
 TEST(YCbCrInput, Subsampling420) {
        const int width = 4;
        const int height = 4;