Add partial Rec. 2020 support.

[movit] / ycbcr_input_test.cpp

diff --git a/ycbcr_input_test.cpp b/ycbcr_input_test.cpp
index 15d76391281a7c5ccdc438b4b7fe5c4679fc4a4b..4ff263ab2e401947af95e3099912196919a9e0cd 100644 (file)
--- a/ycbcr_input_test.cpp
+++ b/ycbcr_input_test.cpp
@@ -168,6 +168,61 @@ TEST(YCbCrInput, Rec709) {
        expect_equal(expected_data, out_data, 4 * width, height, 0.025, 0.002);
 }
 
+TEST(YCbCrInput, Rec2020) {
+       const int width = 1;
+       const int height = 5;
+
+       // Pure-color test inputs, calculated with the formulas in Rec. 2020
+       // page 4, tables 4 and 5 (for conventional non-constant luminance).
+       // Note that we still use 8-bit inputs, even though Rec. 2020 is only
+       // defined for 10- and 12-bit.
+       unsigned char y[width * height] = {
+               16, 235, 74, 164, 29,
+       };
+       unsigned char cb[width * height] = {
+               128, 128, 97, 47, 240,
+       };
+       unsigned char cr[width * height] = {
+               128, 128, 240, 25, 119,
+       };
+       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_2020;
+       ycbcr_format.full_range = false;
+       ycbcr_format.chroma_subsampling_x = 1;
+       ycbcr_format.chroma_subsampling_y = 1;
+       ycbcr_format.cb_x_position = 0.5f;
+       ycbcr_format.cb_y_position = 0.5f;
+       ycbcr_format.cr_x_position = 0.5f;
+       ycbcr_format.cr_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;