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      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