1 // Unit tests for YCbCrInput.
2 // FIXME: This class really ought to support mipmaps.
5 #include "gtest/gtest.h"
6 #include "ycbcr_input.h"
8 TEST(YCbCrInput, Simple444) {
12 // Pure-color test inputs, calculated with the formulas in Rec. 601
14 unsigned char y[width * height] = {
17 unsigned char cb[width * height] = {
18 128, 128, 90, 54, 240,
20 unsigned char cr[width * height] = {
21 128, 128, 240, 34, 110,
23 float expected_data[4 * width * height] = {
30 float out_data[4 * width * height];
32 EffectChainTester tester(NULL, width, height);
35 format.color_space = COLORSPACE_sRGB;
36 format.gamma_curve = GAMMA_sRGB;
38 YCbCrFormat ycbcr_format;
39 ycbcr_format.luma_coefficients = YCBCR_REC_601;
40 ycbcr_format.full_range = false;
41 ycbcr_format.chroma_subsampling_x = 1;
42 ycbcr_format.chroma_subsampling_y = 1;
43 ycbcr_format.chroma_x_position = 0.5f;
44 ycbcr_format.chroma_y_position = 0.5f;
46 YCbCrInput *input = new YCbCrInput(format, ycbcr_format, width, height);
47 input->set_pixel_data(0, y);
48 input->set_pixel_data(1, cb);
49 input->set_pixel_data(2, cr);
50 tester.get_chain()->add_input(input);
52 tester.run(out_data, GL_RGBA, COLORSPACE_sRGB, GAMMA_sRGB);
54 // Y'CbCr isn't 100% accurate (the input values are rounded),
55 // so we need some leeway.
56 expect_equal(expected_data, out_data, 4 * width, height, 0.025, 0.002);
59 TEST(YCbCrInput, FullRangeRec601) {
63 // Pure-color test inputs, calculated with the formulas in Rec. 601
64 // section 2.5.4 but without the scaling factors applied
65 // (so both R, G, B, Y, Cb and R vary from 0 to 255).
66 unsigned char y[width * height] = {
69 unsigned char cb[width * height] = {
70 128, 128, 85, 44, 255,
72 unsigned char cr[width * height] = {
73 128, 128, 255, 21, 107,
75 float expected_data[4 * width * height] = {
82 float out_data[4 * width * height];
84 EffectChainTester tester(NULL, width, height);
87 format.color_space = COLORSPACE_sRGB;
88 format.gamma_curve = GAMMA_sRGB;
90 YCbCrFormat ycbcr_format;
91 ycbcr_format.luma_coefficients = YCBCR_REC_601;
92 ycbcr_format.full_range = true;
93 ycbcr_format.chroma_subsampling_x = 1;
94 ycbcr_format.chroma_subsampling_y = 1;
95 ycbcr_format.chroma_x_position = 0.5f;
96 ycbcr_format.chroma_y_position = 0.5f;
98 YCbCrInput *input = new YCbCrInput(format, ycbcr_format, width, height);
99 input->set_pixel_data(0, y);
100 input->set_pixel_data(1, cb);
101 input->set_pixel_data(2, cr);
102 tester.get_chain()->add_input(input);
104 tester.run(out_data, GL_RGBA, COLORSPACE_sRGB, GAMMA_sRGB);
106 // Y'CbCr isn't 100% accurate (the input values are rounded),
107 // so we need some leeway.
108 expect_equal(expected_data, out_data, 4 * width, height, 0.025, 0.002);
111 TEST(YCbCrInput, Rec709) {
113 const int height = 5;
115 // Pure-color test inputs, calculated with the formulas in Rec. 709
116 // page 19, items 3.4 and 3.5.
117 unsigned char y[width * height] = {
118 16, 235, 63, 173, 32,
120 unsigned char cb[width * height] = {
121 128, 128, 102, 42, 240,
123 unsigned char cr[width * height] = {
124 128, 128, 240, 26, 118,
126 float expected_data[4 * width * height] = {
133 float out_data[4 * width * height];
135 EffectChainTester tester(NULL, width, height);
138 format.color_space = COLORSPACE_sRGB;
139 format.gamma_curve = GAMMA_sRGB;
141 YCbCrFormat ycbcr_format;
142 ycbcr_format.luma_coefficients = YCBCR_REC_709;
143 ycbcr_format.full_range = false;
144 ycbcr_format.chroma_subsampling_x = 1;
145 ycbcr_format.chroma_subsampling_y = 1;
146 ycbcr_format.chroma_x_position = 0.5f;
147 ycbcr_format.chroma_y_position = 0.5f;
149 YCbCrInput *input = new YCbCrInput(format, ycbcr_format, width, height);
150 input->set_pixel_data(0, y);
151 input->set_pixel_data(1, cb);
152 input->set_pixel_data(2, cr);
153 tester.get_chain()->add_input(input);
155 tester.run(out_data, GL_RGBA, COLORSPACE_sRGB, GAMMA_sRGB);
157 // Y'CbCr isn't 100% accurate (the input values are rounded),
158 // so we need some leeway.
159 expect_equal(expected_data, out_data, 4 * width, height, 0.025, 0.002);
162 TEST(YCbCrInput, Subsampling420) {
164 const int height = 4;
166 unsigned char y[width * height] = {
172 unsigned char cb[(width/2) * (height/2)] = {
176 unsigned char cr[(width/2) * (height/2)] = {
181 // Note: This is only the blue channel. The chroma samples (with associated
182 // values for blue) are marked off in comments.
183 float expected_data[width * height] = {
184 0.000, 0.125, 0.375, 0.500,
186 0.125, 0.250, 0.500, 0.625,
188 0.375, 0.500, 0.750, 0.875,
190 0.500, 0.625, 0.875, 1.000,
192 float out_data[width * height];
194 EffectChainTester tester(NULL, width, height);
197 format.color_space = COLORSPACE_sRGB;
198 format.gamma_curve = GAMMA_sRGB;
200 YCbCrFormat ycbcr_format;
201 ycbcr_format.luma_coefficients = YCBCR_REC_601;
202 ycbcr_format.full_range = false;
203 ycbcr_format.chroma_subsampling_x = 2;
204 ycbcr_format.chroma_subsampling_y = 2;
205 ycbcr_format.chroma_x_position = 0.5f;
206 ycbcr_format.chroma_y_position = 0.5f;
208 YCbCrInput *input = new YCbCrInput(format, ycbcr_format, width, height);
209 input->set_pixel_data(0, y);
210 input->set_pixel_data(1, cb);
211 input->set_pixel_data(2, cr);
212 tester.get_chain()->add_input(input);
214 tester.run(out_data, GL_BLUE, COLORSPACE_sRGB, GAMMA_sRGB);
216 // Y'CbCr isn't 100% accurate (the input values are rounded),
217 // so we need some leeway.
218 expect_equal(expected_data, out_data, width, height, 0.01, 0.001);
221 TEST(YCbCrInput, Subsampling420WithNonCenteredSamples) {
223 const int height = 4;
225 unsigned char y[width * height] = {
231 unsigned char cb[(width/2) * (height/2)] = {
235 unsigned char cr[(width/2) * (height/2)] = {
240 // Note: This is only the blue channel. The chroma samples (with associated
241 // values for blue) are marked off in comments.
242 float expected_data[width * height] = {
243 0.000, 0.250, 0.500, 0.500,
245 0.125, 0.375, 0.625, 0.625,
247 0.375, 0.625, 0.875, 0.875,
249 0.500, 0.750, 1.000, 1.000,
251 float out_data[width * height];
253 EffectChainTester tester(NULL, width, height);
256 format.color_space = COLORSPACE_sRGB;
257 format.gamma_curve = GAMMA_sRGB;
259 YCbCrFormat ycbcr_format;
260 ycbcr_format.luma_coefficients = YCBCR_REC_601;
261 ycbcr_format.full_range = false;
262 ycbcr_format.chroma_subsampling_x = 2;
263 ycbcr_format.chroma_subsampling_y = 2;
264 ycbcr_format.chroma_x_position = 0.0f;
265 ycbcr_format.chroma_y_position = 0.5f;
267 YCbCrInput *input = new YCbCrInput(format, ycbcr_format, width, height);
268 input->set_pixel_data(0, y);
269 input->set_pixel_data(1, cb);
270 input->set_pixel_data(2, cr);
271 tester.get_chain()->add_input(input);
273 tester.run(out_data, GL_BLUE, COLORSPACE_sRGB, GAMMA_sRGB);
275 // Y'CbCr isn't 100% accurate (the input values are rounded),
276 // so we need some leeway.
277 expect_equal(expected_data, out_data, width, height, 0.01, 0.001);