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
52using namespace std;
53
54#if PLATFORM(WIN)
55static const CFStringRef kUTTypePNG = CFSTR("public.png");
56#endif
57
58static 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
71void 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
109void dumpBitmap(BitmapContext* context)
110{
111    RetainPtr<CGImageRef> image(AdoptCF, CGBitmapContextCreateImage(context->cgContext()));
112    printPNG(image.get());
113}
114