+TEST(YCbCrConversionEffectTest, PlanarOutput) {
+ 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 out_y[width * height], out_cb[width * height], out_cr[width * height];
+
+ EffectChainTester tester(NULL, 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_ycbcr_output(format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED, ycbcr_format, YCBCR_OUTPUT_PLANAR);
+
+ 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_y, out_cb, out_cr, GL_RED, COLORSPACE_sRGB, GAMMA_sRGB);
+ expect_equal(y, out_y, width, height);
+ expect_equal(cb, out_cb, width, height);
+ expect_equal(cr, out_cr, width, height);
+}
+
+TEST(YCbCrConversionEffectTest, SplitLumaAndChroma) {
+ 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,
+ };
+
+ // The R and A data, rearranged. Note: The G and B channels
+ // (the middle columns) are undefined. If we change the behavior,
+ // the test will need to be updated, but a failure is expected.
+ unsigned char expected_y[width * height * 4] = {
+ 16, /*undefined:*/ 16, /*undefined:*/ 16, 255,
+ 235, /*undefined:*/ 235, /*undefined:*/ 235, 255,
+ 81, /*undefined:*/ 81, /*undefined:*/ 81, 255,
+ 145, /*undefined:*/ 145, /*undefined:*/ 145, 255,
+ 41, /*undefined:*/ 41, /*undefined:*/ 41, 255,
+ };
+
+ // Just the Cb and Cr data, rearranged. The B and A channels
+ // are undefined, as below.
+ unsigned char expected_cbcr[width * height * 4] = {
+ 128, 128, /*undefined:*/ 128, /*undefined:*/ 255,
+ 128, 128, /*undefined:*/ 128, /*undefined:*/ 255,
+ 90, 240, /*undefined:*/ 240, /*undefined:*/ 255,
+ 54, 34, /*undefined:*/ 34, /*undefined:*/ 255,
+ 240, 110, /*undefined:*/ 110, /*undefined:*/ 255,
+ };
+
+ unsigned char out_y[width * height * 4], out_cbcr[width * height * 4];
+
+ EffectChainTester tester(NULL, 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_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);
+
+ tester.run(out_y, out_cbcr, GL_RGBA, COLORSPACE_sRGB, GAMMA_sRGB);
+ expect_equal(expected_y, out_y, width * 4, height);
+ expect_equal(expected_cbcr, out_cbcr, width * 4, height);
+}
+
+TEST(YCbCrConversionEffectTest, OutputChunkyAndRGBA) {
+ 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_rgba[width * height * 4];
+
+ EffectChainTester tester(NULL, 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);
+
+ 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_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);
+}
+