1 // Copyright (c) 2011 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 <math.h> 6 7 #include "base/basictypes.h" 8 #include "testing/gtest/include/gtest/gtest.h" 9 #include "ui/gfx/codec/jpeg_codec.h" 10 11 namespace { 12 13 // A JPEG image used by TopSitesMigrationTest, whose size is 1x1. 14 // This image causes an invalid-read error to libjpeg-turbo 1.0.1. 15 const uint8 kTopSitesMigrationTestImage[] = 16 "\xff\xd8\xff\xe0\x00\x10\x4a\x46\x49\x46\x00\x01\x01\x00\x00\x01" 17 "\x00\x01\x00\x00\xff\xdb\x00\x43\x00\x03\x02\x02\x03\x02\x02\x03" 18 "\x03\x03\x03\x04\x03\x03\x04\x05\x08\x05\x05\x04\x04\x05\x0a\x07" 19 "\x07\x06\x08\x0c\x0a\x0c\x0c\x0b\x0a\x0b\x0b\x0d\x0e\x12\x10\x0d" 20 "\x0e\x11\x0e\x0b\x0b\x10\x16\x10\x11\x13\x14\x15\x15\x15\x0c\x0f" 21 "\x17\x18\x16\x14\x18\x12\x14\x15\x14\xff\xdb\x00\x43\x01\x03\x04" 22 "\x04\x05\x04\x05\x09\x05\x05\x09\x14\x0d\x0b\x0d\x14\x14\x14\x14" 23 "\x14\x14\x14\x14\x14\x14\x14\x14\x14\x14\x14\x14\x14\x14\x14\x14" 24 "\x14\x14\x14\x14\x14\x14\x14\x14\x14\x14\x14\x14\x14\x14\x14\x14" 25 "\x14\x14\x14\x14\x14\x14\x14\x14\x14\x14\x14\x14\x14\x14\xff\xc0" 26 "\x00\x11\x08\x00\x01\x00\x01\x03\x01\x22\x00\x02\x11\x01\x03\x11" 27 "\x01\xff\xc4\x00\x1f\x00\x00\x01\x05\x01\x01\x01\x01\x01\x01\x00" 28 "\x00\x00\x00\x00\x00\x00\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09" 29 "\x0a\x0b\xff\xc4\x00\xb5\x10\x00\x02\x01\x03\x03\x02\x04\x03\x05" 30 "\x05\x04\x04\x00\x00\x01\x7d\x01\x02\x03\x00\x04\x11\x05\x12\x21" 31 "\x31\x41\x06\x13\x51\x61\x07\x22\x71\x14\x32\x81\x91\xa1\x08\x23" 32 "\x42\xb1\xc1\x15\x52\xd1\xf0\x24\x33\x62\x72\x82\x09\x0a\x16\x17" 33 "\x18\x19\x1a\x25\x26\x27\x28\x29\x2a\x34\x35\x36\x37\x38\x39\x3a" 34 "\x43\x44\x45\x46\x47\x48\x49\x4a\x53\x54\x55\x56\x57\x58\x59\x5a" 35 "\x63\x64\x65\x66\x67\x68\x69\x6a\x73\x74\x75\x76\x77\x78\x79\x7a" 36 "\x83\x84\x85\x86\x87\x88\x89\x8a\x92\x93\x94\x95\x96\x97\x98\x99" 37 "\x9a\xa2\xa3\xa4\xa5\xa6\xa7\xa8\xa9\xaa\xb2\xb3\xb4\xb5\xb6\xb7" 38 "\xb8\xb9\xba\xc2\xc3\xc4\xc5\xc6\xc7\xc8\xc9\xca\xd2\xd3\xd4\xd5" 39 "\xd6\xd7\xd8\xd9\xda\xe1\xe2\xe3\xe4\xe5\xe6\xe7\xe8\xe9\xea\xf1" 40 "\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9\xfa\xff\xc4\x00\x1f\x01\x00\x03" 41 "\x01\x01\x01\x01\x01\x01\x01\x01\x01\x00\x00\x00\x00\x00\x00\x01" 42 "\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\xff\xc4\x00\xb5\x11\x00" 43 "\x02\x01\x02\x04\x04\x03\x04\x07\x05\x04\x04\x00\x01\x02\x77\x00" 44 "\x01\x02\x03\x11\x04\x05\x21\x31\x06\x12\x41\x51\x07\x61\x71\x13" 45 "\x22\x32\x81\x08\x14\x42\x91\xa1\xb1\xc1\x09\x23\x33\x52\xf0\x15" 46 "\x62\x72\xd1\x0a\x16\x24\x34\xe1\x25\xf1\x17\x18\x19\x1a\x26\x27" 47 "\x28\x29\x2a\x35\x36\x37\x38\x39\x3a\x43\x44\x45\x46\x47\x48\x49" 48 "\x4a\x53\x54\x55\x56\x57\x58\x59\x5a\x63\x64\x65\x66\x67\x68\x69" 49 "\x6a\x73\x74\x75\x76\x77\x78\x79\x7a\x82\x83\x84\x85\x86\x87\x88" 50 "\x89\x8a\x92\x93\x94\x95\x96\x97\x98\x99\x9a\xa2\xa3\xa4\xa5\xa6" 51 "\xa7\xa8\xa9\xaa\xb2\xb3\xb4\xb5\xb6\xb7\xb8\xb9\xba\xc2\xc3\xc4" 52 "\xc5\xc6\xc7\xc8\xc9\xca\xd2\xd3\xd4\xd5\xd6\xd7\xd8\xd9\xda\xe2" 53 "\xe3\xe4\xe5\xe6\xe7\xe8\xe9\xea\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9" 54 "\xfa\xff\xda\x00\x0c\x03\x01\x00\x02\x11\x03\x11\x00\x3f\x00\xf9" 55 "\xd2\x8a\x28\xaf\xc3\x0f\xf5\x4c\xff\xd9"; 56 57 } // namespace 58 59 namespace gfx { 60 61 // out of 100, this indicates how compressed it will be, this should be changed 62 // with jpeg equality threshold 63 // static int jpeg_quality = 75; // FIXME(brettw) 64 static int jpeg_quality = 100; 65 66 // The threshold of average color differences where we consider two images 67 // equal. This number was picked to be a little above the observed difference 68 // using the above quality. 69 static double jpeg_equality_threshold = 1.0; 70 71 // Computes the average difference between each value in a and b. A and b 72 // should be the same size. Used to see if two images are approximately equal 73 // in the presence of compression. 74 static double AveragePixelDelta(const std::vector<unsigned char>& a, 75 const std::vector<unsigned char>& b) { 76 // if the sizes are different, say the average difference is the maximum 77 if (a.size() != b.size()) 78 return 255.0; 79 if (a.empty()) 80 return 0; // prevent divide by 0 below 81 82 double acc = 0.0; 83 for (size_t i = 0; i < a.size(); i++) 84 acc += fabs(static_cast<double>(a[i]) - static_cast<double>(b[i])); 85 86 return acc / static_cast<double>(a.size()); 87 } 88 89 static void MakeRGBImage(int w, int h, std::vector<unsigned char>* dat) { 90 dat->resize(w * h * 3); 91 for (int y = 0; y < h; y++) { 92 for (int x = 0; x < w; x++) { 93 unsigned char* org_px = &(*dat)[(y * w + x) * 3]; 94 org_px[0] = x * 3; // r 95 org_px[1] = x * 3 + 1; // g 96 org_px[2] = x * 3 + 2; // b 97 } 98 } 99 } 100 101 TEST(JPEGCodec, EncodeDecodeRGB) { 102 int w = 20, h = 20; 103 104 // create an image with known values 105 std::vector<unsigned char> original; 106 MakeRGBImage(w, h, &original); 107 108 // encode, making sure it was compressed some 109 std::vector<unsigned char> encoded; 110 EXPECT_TRUE(JPEGCodec::Encode(&original[0], JPEGCodec::FORMAT_RGB, w, h, 111 w * 3, jpeg_quality, &encoded)); 112 EXPECT_GT(original.size(), encoded.size()); 113 114 // decode, it should have the same size as the original 115 std::vector<unsigned char> decoded; 116 int outw, outh; 117 EXPECT_TRUE(JPEGCodec::Decode(&encoded[0], encoded.size(), 118 JPEGCodec::FORMAT_RGB, &decoded, 119 &outw, &outh)); 120 ASSERT_EQ(w, outw); 121 ASSERT_EQ(h, outh); 122 ASSERT_EQ(original.size(), decoded.size()); 123 124 // Images must be approximately equal (compression will have introduced some 125 // minor artifacts). 126 ASSERT_GE(jpeg_equality_threshold, AveragePixelDelta(original, decoded)); 127 } 128 129 TEST(JPEGCodec, EncodeDecodeRGBA) { 130 int w = 20, h = 20; 131 132 // create an image with known values, a must be opaque because it will be 133 // lost during compression 134 std::vector<unsigned char> original; 135 original.resize(w * h * 4); 136 for (int y = 0; y < h; y++) { 137 for (int x = 0; x < w; x++) { 138 unsigned char* org_px = &original[(y * w + x) * 4]; 139 org_px[0] = x * 3; // r 140 org_px[1] = x * 3 + 1; // g 141 org_px[2] = x * 3 + 2; // b 142 org_px[3] = 0xFF; // a (opaque) 143 } 144 } 145 146 // encode, making sure it was compressed some 147 std::vector<unsigned char> encoded; 148 EXPECT_TRUE(JPEGCodec::Encode(&original[0], JPEGCodec::FORMAT_RGBA, w, h, 149 w * 4, jpeg_quality, &encoded)); 150 EXPECT_GT(original.size(), encoded.size()); 151 152 // decode, it should have the same size as the original 153 std::vector<unsigned char> decoded; 154 int outw, outh; 155 EXPECT_TRUE(JPEGCodec::Decode(&encoded[0], encoded.size(), 156 JPEGCodec::FORMAT_RGBA, &decoded, 157 &outw, &outh)); 158 ASSERT_EQ(w, outw); 159 ASSERT_EQ(h, outh); 160 ASSERT_EQ(original.size(), decoded.size()); 161 162 // Images must be approximately equal (compression will have introduced some 163 // minor artifacts). 164 ASSERT_GE(jpeg_equality_threshold, AveragePixelDelta(original, decoded)); 165 } 166 167 // Test that corrupted data decompression causes failures. 168 TEST(JPEGCodec, DecodeCorrupted) { 169 int w = 20, h = 20; 170 171 // some random data (an uncompressed image) 172 std::vector<unsigned char> original; 173 MakeRGBImage(w, h, &original); 174 175 // it should fail when given non-JPEG compressed data 176 std::vector<unsigned char> output; 177 int outw, outh; 178 ASSERT_FALSE(JPEGCodec::Decode(&original[0], original.size(), 179 JPEGCodec::FORMAT_RGB, &output, 180 &outw, &outh)); 181 182 // make some compressed data 183 std::vector<unsigned char> compressed; 184 ASSERT_TRUE(JPEGCodec::Encode(&original[0], JPEGCodec::FORMAT_RGB, w, h, 185 w * 3, jpeg_quality, &compressed)); 186 187 // try decompressing a truncated version 188 ASSERT_FALSE(JPEGCodec::Decode(&compressed[0], compressed.size() / 2, 189 JPEGCodec::FORMAT_RGB, &output, 190 &outw, &outh)); 191 192 // corrupt it and try decompressing that 193 for (int i = 10; i < 30; i++) 194 compressed[i] = i; 195 ASSERT_FALSE(JPEGCodec::Decode(&compressed[0], compressed.size(), 196 JPEGCodec::FORMAT_RGB, &output, 197 &outw, &outh)); 198 } 199 200 // Test that we can decode JPEG images without invalid-read errors on valgrind. 201 // This test decodes a 1x1 JPEG image and writes the decoded RGB (or RGBA) pixel 202 // to the output buffer without OOB reads. 203 TEST(JPEGCodec, InvalidRead) { 204 std::vector<unsigned char> output; 205 int outw, outh; 206 JPEGCodec::Decode(kTopSitesMigrationTestImage, 207 arraysize(kTopSitesMigrationTestImage), 208 JPEGCodec::FORMAT_RGB, &output, 209 &outw, &outh); 210 211 JPEGCodec::Decode(kTopSitesMigrationTestImage, 212 arraysize(kTopSitesMigrationTestImage), 213 JPEGCodec::FORMAT_RGBA, &output, 214 &outw, &outh); 215 } 216 217 } // namespace gfx 218
