ui/gfx/codec/jpeg_codec_unittest.cc

   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