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;