1 /* 2 * Copyright (C) 2005, 2007 Apple Inc. All rights reserved. 3 * Copyright (C) 2005 Ben La Monica <ben.lamonica (at) gmail.com>. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY 15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR 18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #define min min 28 29 // FIXME: We need to be able to include these defines from a config.h somewhere. 30 #define JS_EXPORT_PRIVATE 31 #define WTF_EXPORT_PRIVATE 32 33 #include <stdio.h> 34 #include <wtf/Platform.h> 35 #include <wtf/RetainPtr.h> 36 37 #if PLATFORM(WIN) 38 #include <winsock2.h> 39 #include <windows.h> 40 #include <fcntl.h> 41 #include <io.h> 42 #include <wtf/MathExtras.h> 43 #endif 44 45 #include <CoreGraphics/CGBitmapContext.h> 46 #include <CoreGraphics/CGImage.h> 47 #include <ImageIO/CGImageDestination.h> 48 49 #if PLATFORM(MAC) 50 #include <LaunchServices/UTCoreTypes.h> 51 #endif 52 53 #ifndef CGFLOAT_DEFINED 54 #ifdef __LP64__ 55 typedef double CGFloat; 56 #else 57 typedef float CGFloat; 58 #endif 59 #define CGFLOAT_DEFINED 1 60 #endif 61 62 using namespace std; 63 64 #if PLATFORM(WIN) 65 static inline float strtof(const char *nptr, char **endptr) 66 { 67 return strtod(nptr, endptr); 68 } 69 static const CFStringRef kUTTypePNG = CFSTR("public.png"); 70 #endif 71 72 static RetainPtr<CGImageRef> createImageFromStdin(int bytesRemaining) 73 { 74 unsigned char buffer[2048]; 75 RetainPtr<CFMutableDataRef> data(AdoptCF, CFDataCreateMutable(0, bytesRemaining)); 76 77 while (bytesRemaining > 0) { 78 size_t bytesToRead = min(bytesRemaining, 2048); 79 size_t bytesRead = fread(buffer, 1, bytesToRead, stdin); 80 CFDataAppendBytes(data.get(), buffer, static_cast<CFIndex>(bytesRead)); 81 bytesRemaining -= static_cast<int>(bytesRead); 82 } 83 RetainPtr<CGDataProviderRef> dataProvider(AdoptCF, CGDataProviderCreateWithCFData(data.get())); 84 return RetainPtr<CGImageRef>(AdoptCF, CGImageCreateWithPNGDataProvider(dataProvider.get(), 0, false, kCGRenderingIntentDefault)); 85 } 86 87 static void releaseMallocBuffer(void* info, const void* data, size_t size) 88 { 89 free((void*)data); 90 } 91 92 static RetainPtr<CGImageRef> createDifferenceImage(CGImageRef baseImage, CGImageRef testImage, float& difference) 93 { 94 size_t width = CGImageGetWidth(baseImage); 95 size_t height = CGImageGetHeight(baseImage); 96 size_t rowBytes = width * 4; 97 98 // Draw base image in bitmap context 99 void* baseBuffer = calloc(height, rowBytes); 100 RetainPtr<CGContextRef> baseContext(AdoptCF, CGBitmapContextCreate(baseBuffer, width, height, 8, rowBytes, CGImageGetColorSpace(baseImage), kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host)); 101 CGContextDrawImage(baseContext.get(), CGRectMake(0, 0, width, height), baseImage); 102 103 // Draw test image in bitmap context 104 void* buffer = calloc(height, rowBytes); 105 RetainPtr<CGContextRef> context(AdoptCF, CGBitmapContextCreate(buffer, width, height, 8, rowBytes, CGImageGetColorSpace(testImage), kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host)); 106 CGContextDrawImage(context.get(), CGRectMake(0, 0, width, height), testImage); 107 108 // Compare the content of the 2 bitmaps 109 void* diffBuffer = malloc(width * height); 110 float count = 0.0f; 111 float sum = 0.0f; 112 float maxDistance = 0.0f; 113 unsigned char* basePixel = (unsigned char*)baseBuffer; 114 unsigned char* pixel = (unsigned char*)buffer; 115 unsigned char* diff = (unsigned char*)diffBuffer; 116 for (size_t y = 0; y < height; ++y) { 117 for (size_t x = 0; x < width; ++x) { 118 float red = (pixel[0] - basePixel[0]) / max<float>(255 - basePixel[0], basePixel[0]); 119 float green = (pixel[1] - basePixel[1]) / max<float>(255 - basePixel[1], basePixel[1]); 120 float blue = (pixel[2] - basePixel[2]) / max<float>(255 - basePixel[2], basePixel[2]); 121 float alpha = (pixel[3] - basePixel[3]) / max<float>(255 - basePixel[3], basePixel[3]); 122 float distance = sqrtf(red * red + green * green + blue * blue + alpha * alpha) / 2.0f; 123 124 *diff++ = (unsigned char)(distance * 255.0f); 125 126 if (distance >= 1.0f / 255.0f) { 127 count += 1.0f; 128 sum += distance; 129 if (distance > maxDistance) 130 maxDistance = distance; 131 } 132 133 basePixel += 4; 134 pixel += 4; 135 } 136 } 137 138 // Compute the difference as a percentage combining both the number of different pixels and their difference amount i.e. the average distance over the entire image 139 if (count > 0.0f) 140 difference = 100.0f * sum / (height * width); 141 else 142 difference = 0.0f; 143 144 RetainPtr<CGImageRef> diffImage; 145 // Generate a normalized diff image if there is any difference 146 if (difference > 0.0f) { 147 if (maxDistance < 1.0f) { 148 diff = (unsigned char*)diffBuffer; 149 for(size_t p = 0; p < height * width; ++p) 150 diff[p] = diff[p] / maxDistance; 151 } 152 153 static CGColorSpaceRef diffColorspace = CGColorSpaceCreateDeviceGray(); 154 RetainPtr<CGDataProviderRef> provider(AdoptCF, CGDataProviderCreateWithData(0, diffBuffer, width * height, releaseMallocBuffer)); 155 diffImage.adoptCF(CGImageCreate(width, height, 8, 8, width, diffColorspace, 0, provider.get(), 0, false, kCGRenderingIntentDefault)); 156 } 157 else 158 free(diffBuffer); 159 160 // Destroy drawing buffers 161 if (buffer) 162 free(buffer); 163 if (baseBuffer) 164 free(baseBuffer); 165 166 return diffImage; 167 } 168 169 static inline bool imageHasAlpha(CGImageRef image) 170 { 171 CGImageAlphaInfo info = CGImageGetAlphaInfo(image); 172 173 return (info >= kCGImageAlphaPremultipliedLast) && (info <= kCGImageAlphaFirst); 174 } 175 176 int main(int argc, const char* argv[]) 177 { 178 #if PLATFORM(WIN) 179 _setmode(0, _O_BINARY); 180 _setmode(1, _O_BINARY); 181 #endif 182 183 float tolerance = 0.0f; 184 185 for (int i = 1; i < argc; ++i) { 186 if (!strcmp(argv[i], "-t") || !strcmp(argv[i], "--tolerance")) { 187 if (i >= argc - 1) 188 exit(1); 189 tolerance = strtof(argv[i + 1], 0); 190 ++i; 191 continue; 192 } 193 } 194 195 char buffer[2048]; 196 RetainPtr<CGImageRef> actualImage; 197 RetainPtr<CGImageRef> baselineImage; 198 199 while (fgets(buffer, sizeof(buffer), stdin)) { 200 // remove the CR 201 char* newLineCharacter = strchr(buffer, '\n'); 202 if (newLineCharacter) 203 *newLineCharacter = '\0'; 204 205 if (!strncmp("Content-Length: ", buffer, 16)) { 206 strtok(buffer, " "); 207 int imageSize = strtol(strtok(0, " "), 0, 10); 208 209 if (imageSize > 0 && !actualImage) 210 actualImage = createImageFromStdin(imageSize); 211 else if (imageSize > 0 && !baselineImage) 212 baselineImage = createImageFromStdin(imageSize); 213 else 214 fputs("error, image size must be specified.\n", stdout); 215 } 216 217 if (actualImage && baselineImage) { 218 RetainPtr<CGImageRef> diffImage; 219 float difference = 100.0f; 220 221 if ((CGImageGetWidth(actualImage.get()) == CGImageGetWidth(baselineImage.get())) && (CGImageGetHeight(actualImage.get()) == CGImageGetHeight(baselineImage.get())) && (imageHasAlpha(actualImage.get()) == imageHasAlpha(baselineImage.get()))) { 222 diffImage = createDifferenceImage(actualImage.get(), baselineImage.get(), difference); // difference is passed by reference 223 if (difference <= tolerance) 224 difference = 0.0f; 225 else { 226 difference = roundf(difference * 100.0f) / 100.0f; 227 difference = max(difference, 0.01f); // round to 2 decimal places 228 } 229 } else 230 fputs("error, test and reference image have different properties.\n", stderr); 231 232 if (difference > 0.0f) { 233 if (diffImage) { 234 RetainPtr<CFMutableDataRef> imageData(AdoptCF, CFDataCreateMutable(0, 0)); 235 RetainPtr<CGImageDestinationRef> imageDest(AdoptCF, CGImageDestinationCreateWithData(imageData.get(), kUTTypePNG, 1, 0)); 236 CGImageDestinationAddImage(imageDest.get(), diffImage.get(), 0); 237 CGImageDestinationFinalize(imageDest.get()); 238 printf("Content-Length: %lu\n", CFDataGetLength(imageData.get())); 239 fwrite(CFDataGetBytePtr(imageData.get()), 1, CFDataGetLength(imageData.get()), stdout); 240 } 241 242 fprintf(stdout, "diff: %01.2f%% failed\n", difference); 243 } else 244 fprintf(stdout, "diff: %01.2f%% passed\n", difference); 245 246 actualImage = 0; 247 baselineImage = 0; 248 } 249 250 fflush(stdout); 251 } 252 253 return 0; 254 } 255