1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "base/cpu.h"
6 #include "base/memory/scoped_ptr.h"
7 #include "media/base/simd/convert_rgb_to_yuv.h"
8 #include "testing/gtest/include/gtest/gtest.h"
9
10 namespace {
11
12 // Reference code that converts RGB pixels to YUV pixels.
ConvertRGBToY(const uint8 * rgb)13 int ConvertRGBToY(const uint8* rgb) {
14 int y = 25 * rgb[0] + 129 * rgb[1] + 66 * rgb[2];
15 y = ((y + 128) >> 8) + 16;
16 return std::max(0, std::min(255, y));
17 }
18
ConvertRGBToU(const uint8 * rgb,int size)19 int ConvertRGBToU(const uint8* rgb, int size) {
20 int u = 112 * rgb[0] - 74 * rgb[1] - 38 * rgb[2];
21 u = ((u + 128) >> 8) + 128;
22 return std::max(0, std::min(255, u));
23 }
24
ConvertRGBToV(const uint8 * rgb,int size)25 int ConvertRGBToV(const uint8* rgb, int size) {
26 int v = -18 * rgb[0] - 94 * rgb[1] + 112 * rgb[2];
27 v = ((v + 128) >> 8) + 128;
28 return std::max(0, std::min(255, v));
29 }
30
31 } // namespace
32
33 // Assembly code confuses MemorySanitizer. Do not run it in MSan builds.
34 #if defined(MEMORY_SANITIZER)
35 #define MAYBE_SideBySideRGB DISABLED_SideBySideRGB
36 #else
37 #define MAYBE_SideBySideRGB SideBySideRGB
38 #endif
39
40 // A side-by-side test that verifies our ASM functions that convert RGB pixels
41 // to YUV pixels can output the expected results. This test converts RGB pixels
42 // to YUV pixels with our ASM functions (which use SSE, SSE2, SSE3, and SSSE3)
43 // and compare the output YUV pixels with the ones calculated with out reference
44 // functions implemented in C++.
TEST(YUVConvertTest,MAYBE_SideBySideRGB)45 TEST(YUVConvertTest, MAYBE_SideBySideRGB) {
46 // We skip this test on PCs which does not support SSE3 because this test
47 // needs it.
48 base::CPU cpu;
49 if (!cpu.has_ssse3())
50 return;
51
52 // This test checks a subset of all RGB values so this test does not take so
53 // long time.
54 const int kStep = 8;
55 const int kWidth = 256 / kStep;
56
57 for (int size = 3; size <= 4; ++size) {
58 // Create the output buffers.
59 scoped_ptr<uint8[]> rgb(new uint8[kWidth * size]);
60 scoped_ptr<uint8[]> y(new uint8[kWidth]);
61 scoped_ptr<uint8[]> u(new uint8[kWidth / 2]);
62 scoped_ptr<uint8[]> v(new uint8[kWidth / 2]);
63
64 // Choose the function that converts from RGB pixels to YUV ones.
65 void (*convert)(const uint8*, uint8*, uint8*, uint8*,
66 int, int, int, int, int) = NULL;
67 if (size == 3)
68 convert = media::ConvertRGB24ToYUV_SSSE3;
69 else
70 convert = media::ConvertRGB32ToYUV_SSSE3;
71
72 int total_error = 0;
73 for (int r = 0; r < kWidth; ++r) {
74 for (int g = 0; g < kWidth; ++g) {
75
76 // Fill the input pixels.
77 for (int b = 0; b < kWidth; ++b) {
78 rgb[b * size + 0] = b * kStep;
79 rgb[b * size + 1] = g * kStep;
80 rgb[b * size + 2] = r * kStep;
81 if (size == 4)
82 rgb[b * size + 3] = 255;
83 }
84
85 // Convert the input RGB pixels to YUV ones.
86 convert(rgb.get(), y.get(), u.get(), v.get(), kWidth, 1, kWidth * size,
87 kWidth, kWidth / 2);
88
89 // Check the output Y pixels.
90 for (int i = 0; i < kWidth; ++i) {
91 const uint8* p = &rgb[i * size];
92 int error = ConvertRGBToY(p) - y[i];
93 total_error += error > 0 ? error : -error;
94 }
95
96 // Check the output U pixels.
97 for (int i = 0; i < kWidth / 2; ++i) {
98 const uint8* p = &rgb[i * 2 * size];
99 int error = ConvertRGBToU(p, size) - u[i];
100 total_error += error > 0 ? error : -error;
101 }
102
103 // Check the output V pixels.
104 for (int i = 0; i < kWidth / 2; ++i) {
105 const uint8* p = &rgb[i * 2 * size];
106 int error = ConvertRGBToV(p, size) - v[i];
107 total_error += error > 0 ? error : -error;
108 }
109 }
110 }
111
112 EXPECT_EQ(0, total_error);
113 }
114 }
115