+ tester.run(std::vector<unsigned char *>{out_ycbcr, out_rgba}, GL_RGBA, COLORSPACE_sRGB, GAMMA_sRGB);
+ expect_equal(expected_ycbcr, out_ycbcr, width * 4, height);
+
+ // Y'CbCr isn't 100% accurate (the input values are rounded),
+ // so we need some leeway.
+ expect_equal(expected_rgba, out_rgba, 4 * width, height, 7, 255 * 0.002);
+}
+
+TEST(YCbCrConversionEffectTest, MultipleOutputsAndRGBA) {
+ const int width = 1;
+ const int height = 5;
+
+ // Pure-color test inputs, calculated with the formulas in Rec. 601
+ // section 2.5.4.
+ unsigned char y[width * height] = {
+ 16, 235, 81, 145, 41,
+ };
+ unsigned char cb[width * height] = {
+ 128, 128, 90, 54, 240,
+ };
+ unsigned char cr[width * height] = {
+ 128, 128, 240, 34, 110,
+ };
+ unsigned char expected_ycbcr[width * height * 4] = {
+ // The same data, just rearranged.
+ 16, 128, 128, 255,
+ 235, 128, 128, 255,
+ 81, 90, 240, 255,
+ 145, 54, 34, 255,
+ 41, 240, 110, 255
+ };
+ unsigned char expected_rgba[width * height * 4] = {
+ 0, 0, 0, 255,
+ 255, 255, 255, 255,
+ 255, 0, 0, 255,
+ 0, 255, 0, 255,
+ 0, 0, 255, 255,
+ };
+
+ unsigned char out_ycbcr[width * height * 4];
+ unsigned char out_y[width * height * 4];
+ unsigned char out_cbcr[width * height * 4];
+ unsigned char out_rgba[width * height * 4];
+
+ EffectChainTester tester(nullptr, width, height, FORMAT_GRAYSCALE, COLORSPACE_sRGB, GAMMA_LINEAR, GL_RGBA8);
+
+ 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 = false;
+ ycbcr_format.num_levels = 256;
+ 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;
+
+ tester.add_output(format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
+ tester.add_ycbcr_output(format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED, ycbcr_format);
+ tester.add_ycbcr_output(format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED, ycbcr_format, YCBCR_OUTPUT_SPLIT_Y_AND_CBCR);
+
+ 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);
+
+ // Note: We don't test that the values actually get dithered,
+ // just that the shader compiles and doesn't mess up badly.
+ tester.get_chain()->set_dither_bits(8);
+
+ tester.run({out_ycbcr, out_y, out_cbcr, out_rgba}, GL_RGBA, COLORSPACE_sRGB, GAMMA_sRGB);
+ expect_equal(expected_ycbcr, out_ycbcr, width * 4, height);
+
+ // Check that the extra Y' and CbCr outputs also are fine.
+ for (unsigned i = 0; i < width * height; ++i) {
+ out_ycbcr[i * 4] = out_y[i * 4];
+ out_ycbcr[i * 4 + 1] = out_cbcr[i * 4 + 0];
+ out_ycbcr[i * 4 + 2] = out_cbcr[i * 4 + 1];
+ }