/*

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

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

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

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

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

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

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

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

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

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

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

 *     from this software without specific prior written permission.

 *

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

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

 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

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

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

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

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

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

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

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

 */

#include "config.h"

#include "PixelDumpSupportCG.h"

#include "DumpRenderTree.h"

#include "PixelDumpSupport.h"

#include <ImageIO/CGImageDestination.h>

#include <algorithm>

#include <ctype.h>

#include <wtf/Assertions.h>

#include <wtf/RefPtr.h>

#include <wtf/RetainPtr.h>

#include <wtf/StringExtras.h>

#if PLATFORM(WIN)

#include "MD5.h"

#elif PLATFORM(MAC)

#include <LaunchServices/UTCoreTypes.h>

#define COMMON_DIGEST_FOR_OPENSSL

#include <CommonCrypto/CommonDigest.h>

#endif

using namespace std;

#if PLATFORM(WIN)

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

#endif

static void printPNG(CGImageRef image)

{

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

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

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

    CGImageDestinationFinalize(imageDest.get());

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

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

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

}

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

{

    CGContextRef bitmapContext = context->cgContext();

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

    size_t pixelsHigh = CGBitmapContextGetHeight(bitmapContext);

    size_t pixelsWide = CGBitmapContextGetWidth(bitmapContext);

    size_t bytesPerRow = CGBitmapContextGetBytesPerRow(bitmapContext);

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

    MD5_CTX md5Context;

    MD5_Init(&md5Context);

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

#if PLATFORM(MAC)

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

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

            uint32_t buffer[pixelsWide];

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

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

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

            bitmapData += bytesPerRow;

        }

    } else

#endif

    {

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

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

            bitmapData += bytesPerRow;

        }

    }

    unsigned char hash[16];

    MD5_Final(hash, &md5Context);

    hashString[0] = '\0';

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

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

}

void dumpBitmap(BitmapContext* context)

{

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

    printPNG(image.get());

}