1 /*

     2  * Copyright (C) 2005, 2006, 2007 Apple Inc. All rights reserved.

     3  *           (C) 2007 Graham Dennis (graham.dennis@gmail.com)

     4  *           (C) 2007 Eric Seidel <eric@webkit.org>

     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  *

    10  * 1.  Redistributions of source code must retain the above copyright

    11  *     notice, this list of conditions and the following disclaimer.

    12  * 2.  Redistributions in binary form must reproduce the above copyright

    13  *     notice, this list of conditions and the following disclaimer in the

    14  *     documentation and/or other materials provided with the distribution.

    15  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of

    16  *     its contributors may be used to endorse or promote products derived

    17  *     from this software without specific prior written permission.

    18  *

    19  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY

    20  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

    21  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

    22  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY

    23  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

    24  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

    25  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

    26  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

    27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

    28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

    29  */

    30 

    31 #include "config.h"

    32 #include "PixelDumpSupportCG.h"

    33 

    34 #include "DumpRenderTree.h"

    35 #include "PixelDumpSupport.h"

    36 #include <ImageIO/CGImageDestination.h>

    37 #include <algorithm>

    38 #include <ctype.h>

    39 #include <wtf/Assertions.h>

    40 #include <wtf/RefPtr.h>

    41 #include <wtf/RetainPtr.h>

    42 #include <wtf/StringExtras.h>

    43 

    44 #if PLATFORM(WIN)

    45 #include "MD5.h"

    46 #elif PLATFORM(MAC)

    47 #include <LaunchServices/UTCoreTypes.h>

    48 #define COMMON_DIGEST_FOR_OPENSSL

    49 #include <CommonCrypto/CommonDigest.h>

    50 #endif

    51 

    52 using namespace std;

    53 

    54 #if PLATFORM(WIN)

    55 static const CFStringRef kUTTypePNG = CFSTR("public.png");

    56 #endif

    57 

    58 static void printPNG(CGImageRef image)

    59 {

    60     RetainPtr<CFMutableDataRef> imageData(AdoptCF, CFDataCreateMutable(0, 0));

    61     RetainPtr<CGImageDestinationRef> imageDest(AdoptCF, CGImageDestinationCreateWithData(imageData.get(), kUTTypePNG, 1, 0));

    62     CGImageDestinationAddImage(imageDest.get(), image, 0);

    63     CGImageDestinationFinalize(imageDest.get());

    64 

    65     const UInt8* data = CFDataGetBytePtr(imageData.get());

    66     CFIndex dataLength = CFDataGetLength(imageData.get());

    67 

    68     printPNG(static_cast<const unsigned char*>(data), static_cast<size_t>(dataLength));

    69 }

    70 

    71 void computeMD5HashStringForBitmapContext(BitmapContext* context, char hashString[33])

    72 {

    73     CGContextRef bitmapContext = context->cgContext();

    74 

    75     ASSERT(CGBitmapContextGetBitsPerPixel(bitmapContext) == 32); // ImageDiff assumes 32 bit RGBA, we must as well.

    76     size_t pixelsHigh = CGBitmapContextGetHeight(bitmapContext);

    77     size_t pixelsWide = CGBitmapContextGetWidth(bitmapContext);

    78     size_t bytesPerRow = CGBitmapContextGetBytesPerRow(bitmapContext);

    79 

    80     // We need to swap the bytes to ensure consistent hashes independently of endianness

    81     MD5_CTX md5Context;

    82     MD5_Init(&md5Context);

    83     unsigned char* bitmapData = static_cast<unsigned char*>(CGBitmapContextGetData(bitmapContext));

    84 #if PLATFORM(MAC)

    85     if ((CGBitmapContextGetBitmapInfo(bitmapContext) & kCGBitmapByteOrderMask) == kCGBitmapByteOrder32Big) {

    86         for (unsigned row = 0; row < pixelsHigh; row++) {

    87             uint32_t buffer[pixelsWide];

    88             for (unsigned column = 0; column < pixelsWide; column++)

    89                 buffer[column] = OSReadLittleInt32(bitmapData, 4 * column);

    90             MD5_Update(&md5Context, buffer, 4 * pixelsWide);

    91             bitmapData += bytesPerRow;

    92         }

    93     } else

    94 #endif

    95     {

    96         for (unsigned row = 0; row < pixelsHigh; row++) {

    97             MD5_Update(&md5Context, bitmapData, 4 * pixelsWide);

    98             bitmapData += bytesPerRow;

    99         }

   100     }

   101     unsigned char hash[16];

   102     MD5_Final(hash, &md5Context);

   103 

   104     hashString[0] = '\0';

   105     for (int i = 0; i < 16; i++)

   106         snprintf(hashString, 33, "%s%02x", hashString, hash[i]);

   107 }

   108 

   109 void dumpBitmap(BitmapContext* context)

   110 {

   111     RetainPtr<CGImageRef> image(AdoptCF, CGBitmapContextCreateImage(context->cgContext()));

   112     printPNG(image.get());

   113 }