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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  * Copyright (C) 2011 Brent Fulgham. All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY
     16  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     18  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR
     19  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     20  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     22  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     23  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     25  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 // FIXME: We need to be able to include these defines from a config.h somewhere.
     29 #define JS_EXPORT_PRIVATE
     30 #define WTF_EXPORT_PRIVATE
     31 
     32 #include <cairo.h>
     33 #include <stdio.h>
     34 #include <wtf/Platform.h>
     35 #include <wtf/RefPtr.h>
     36 #include <wtf/RetainPtr.h>
     37 
     38 #if PLATFORM(WIN)
     39 #include <fcntl.h>
     40 #include <io.h>
     41 #include <windows.h>
     42 #include <wtf/MathExtras.h>
     43 #endif
     44 
     45 using namespace std;
     46 
     47 static const int s_bufferSize = 2048;
     48 static const int s_bytesPerPixel = 4;
     49 static cairo_user_data_key_t s_imageDataKey;
     50 
     51 
     52 #if PLATFORM(WIN)
     53 #undef min
     54 #undef max
     55 
     56 static inline float strtof(const char* inputString, char** endptr)
     57 {
     58     return strtod(inputString, endptr);
     59 }
     60 #endif
     61 
     62 static cairo_status_t readFromData(void* closure, unsigned char* data, unsigned int length)
     63 {
     64     CFMutableDataRef dataSource = reinterpret_cast<CFMutableDataRef>(closure);
     65 
     66     CFRange range = CFRangeMake(0, length);
     67     CFDataGetBytes(dataSource, range, data);
     68     CFDataDeleteBytes(dataSource, range);
     69 
     70     return CAIRO_STATUS_SUCCESS;
     71 }
     72 
     73 static cairo_surface_t* createImageFromStdin(int bytesRemaining)
     74 {
     75     unsigned char buffer[s_bufferSize];
     76     RetainPtr<CFMutableDataRef> data(AdoptCF, CFDataCreateMutable(0, bytesRemaining));
     77 
     78     while (bytesRemaining > 0) {
     79         size_t bytesToRead = min(bytesRemaining, s_bufferSize);
     80         size_t bytesRead = fread(buffer, 1, bytesToRead, stdin);
     81         CFDataAppendBytes(data.get(), buffer, static_cast<CFIndex>(bytesRead));
     82         bytesRemaining -= static_cast<int>(bytesRead);
     83     }
     84 
     85     return cairo_image_surface_create_from_png_stream (static_cast<cairo_read_func_t>(readFromData), data.get());
     86 }
     87 
     88 static void releaseMallocBuffer(void* data)
     89 {
     90     free(data);
     91 }
     92 
     93 static inline float pixelDifference(float expected, float actual)
     94 {
     95     return (actual - expected) / max<float>(255 - expected, expected);
     96 }
     97 
     98 static inline void normalizeBuffer(float maxDistance, unsigned char* buffer, size_t length)
     99 {
    100     if (maxDistance >= 1)
    101         return;
    102 
    103     for (size_t p = 0; p < length; ++p)
    104         buffer[p] /= maxDistance;
    105 }
    106 
    107 static cairo_surface_t* createDifferenceImage(cairo_surface_t* baselineImage, cairo_surface_t* actualImage, float& difference)
    108 {
    109     size_t width = cairo_image_surface_get_width(baselineImage);
    110     size_t height = cairo_image_surface_get_height(baselineImage);
    111 
    112     unsigned char* baselinePixel = cairo_image_surface_get_data(baselineImage);
    113     unsigned char* actualPixel = cairo_image_surface_get_data(actualImage);
    114 
    115     // Compare the content of the 2 bitmaps
    116     void* diffBuffer = malloc(width * height);
    117     unsigned char* diffPixel = reinterpret_cast<unsigned char*>(diffBuffer);
    118 
    119     float count = 0;
    120     float sum = 0;
    121     float maxDistance = 0;
    122     for (size_t y = 0; y < height; ++y) {
    123         for (size_t x = 0; x < width; ++x) {
    124             float red = pixelDifference(baselinePixel[0], actualPixel[0]);
    125             float green = pixelDifference(baselinePixel[1], actualPixel[1]);
    126             float blue = pixelDifference(baselinePixel[2], actualPixel[2]);
    127             float alpha = pixelDifference(baselinePixel[3], actualPixel[3]);
    128 
    129             float distance = sqrtf(red * red + green * green + blue * blue + alpha * alpha) / 2.0;
    130 
    131             *diffPixel++ = static_cast<unsigned char>(distance * 255);
    132 
    133             if (distance >= 1.0 / 255.0) {
    134                 ++count;
    135                 sum += distance;
    136                 if (distance > maxDistance)
    137                     maxDistance = distance;
    138             }
    139 
    140             baselinePixel += s_bytesPerPixel;
    141             actualPixel += s_bytesPerPixel;
    142         }
    143     }
    144 
    145     // 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
    146     if (count > 0)
    147         difference = 100.0f * sum / (height * width);
    148     else
    149         difference = 0;
    150 
    151     if (!difference) {
    152         free(diffBuffer);
    153         return 0;
    154     }
    155 
    156     // Generate a normalized diff image
    157     normalizeBuffer(maxDistance, reinterpret_cast<unsigned char*>(diffBuffer), height * width);
    158 
    159     cairo_surface_t* diffImage = cairo_image_surface_create_for_data(diffPixel, CAIRO_FORMAT_ARGB32, width, height, width * s_bytesPerPixel);
    160     cairo_surface_set_user_data(diffImage, &s_imageDataKey, diffBuffer, releaseMallocBuffer);
    161 
    162     return diffImage;
    163 }
    164 
    165 static inline bool imageHasAlpha(cairo_surface_t* image)
    166 {
    167     return (cairo_image_surface_get_format(image) == CAIRO_FORMAT_ARGB32);
    168 }
    169 
    170 static cairo_status_t writeToData(void* closure, unsigned char* data, unsigned int length)
    171 {
    172     CFMutableDataRef dataTarget = reinterpret_cast<CFMutableDataRef>(closure);
    173 
    174     CFDataAppendBytes(dataTarget, data, length);
    175 
    176     return CAIRO_STATUS_SUCCESS;
    177 }
    178 
    179 int main(int argc, const char* argv[])
    180 {
    181 #if PLATFORM(WIN)
    182     _setmode(0, _O_BINARY);
    183     _setmode(1, _O_BINARY);
    184 #endif
    185 
    186     float tolerance = 0;
    187 
    188     for (int i = 1; i < argc; ++i) {
    189         if (!strcmp(argv[i], "-t") || !strcmp(argv[i], "--tolerance")) {
    190             if (i >= argc - 1)
    191                 exit(1);
    192             tolerance = strtof(argv[i + 1], 0);
    193             ++i;
    194             continue;
    195         }
    196     }
    197 
    198     char buffer[s_bufferSize];
    199     cairo_surface_t* actualImage = 0;
    200     cairo_surface_t* baselineImage = 0;
    201 
    202     while (fgets(buffer, sizeof(buffer), stdin)) {
    203         char* newLineCharacter = strchr(buffer, '\n');
    204         if (newLineCharacter)
    205             *newLineCharacter = '\0';
    206 
    207         if (!strncmp("Content-Length: ", buffer, 16)) {
    208             strtok(buffer, " ");
    209             int imageSize = strtol(strtok(0, " "), 0, 10);
    210 
    211             if (imageSize > 0 && !actualImage)
    212                 actualImage = createImageFromStdin(imageSize);
    213             else if (imageSize > 0 && !baselineImage)
    214                 baselineImage = createImageFromStdin(imageSize);
    215             else
    216                 fputs("error, image size must be specified.\n", stdout);
    217         }
    218 
    219         if (actualImage && baselineImage) {
    220             cairo_surface_t* diffImage = 0;
    221             float difference = 100.0;
    222 
    223             if ((cairo_image_surface_get_width(actualImage) == cairo_image_surface_get_width(baselineImage))
    224                 && (cairo_image_surface_get_height(actualImage) == cairo_image_surface_get_height(baselineImage))
    225                 && (imageHasAlpha(actualImage) == imageHasAlpha(baselineImage))) {
    226                 diffImage = createDifferenceImage(actualImage, baselineImage, difference); // difference is passed by reference
    227                 if (difference <= tolerance)
    228                     difference = 0;
    229                 else {
    230                     difference = roundf(difference * 100.0) / 100.0;
    231                     difference = max<float>(difference, 0.01); // round to 2 decimal places
    232                 }
    233             } else
    234                 fputs("error, test and reference image have different properties.\n", stderr);
    235 
    236             if (difference > 0.0) {
    237                 if (diffImage) {
    238                     RetainPtr<CFMutableDataRef> imageData(AdoptCF, CFDataCreateMutable(0, 0));
    239                     cairo_surface_write_to_png_stream(diffImage, (cairo_write_func_t)writeToData, imageData.get());
    240                     printf("Content-Length: %lu\n", CFDataGetLength(imageData.get()));
    241                     fwrite(CFDataGetBytePtr(imageData.get()), 1, CFDataGetLength(imageData.get()), stdout);
    242                     cairo_surface_destroy(diffImage);
    243                     diffImage = 0;
    244                 }
    245 
    246                 fprintf(stdout, "diff: %01.2f%% failed\n", difference);
    247             } else
    248                 fprintf(stdout, "diff: %01.2f%% passed\n", difference);
    249 
    250             cairo_surface_destroy(actualImage);
    251             cairo_surface_destroy(baselineImage);
    252             actualImage = 0;
    253             baselineImage = 0;
    254         }
    255 
    256         fflush(stdout);
    257     }
    258 
    259     return 0;
    260 }
    261