/*

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

 *

 * 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.

 *

 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 COMPUTER, INC. OR

 * 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 "DragImage.h"

#include "CachedImage.h"

#include "GraphicsContext.h"

#include "Image.h"

#include "RetainPtr.h"

#include <CoreGraphics/CoreGraphics.h>

#include <windows.h>

namespace WebCore {

IntSize dragImageSize(DragImageRef image)

{

    if (!image)

        return IntSize();

    BITMAP b;

    GetObject(image, sizeof(BITMAP), &b);

    return IntSize(b.bmWidth, b.bmHeight);

}

void deleteDragImage(DragImageRef image)

{

    if (image)

        ::DeleteObject(image);

}

HBITMAP allocImage(HDC dc, IntSize size, CGContextRef *targetRef)

{

    HBITMAP hbmp;

    BITMAPINFO bmpInfo = {0};

    bmpInfo.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);

    bmpInfo.bmiHeader.biWidth = size.width();

    bmpInfo.bmiHeader.biHeight = size.height();

    bmpInfo.bmiHeader.biPlanes = 1;

    bmpInfo.bmiHeader.biBitCount = 32;

    bmpInfo.bmiHeader.biCompression = BI_RGB;

    LPVOID bits;

    hbmp = CreateDIBSection(dc, &bmpInfo, DIB_RGB_COLORS, &bits, 0, 0);

    if (!targetRef)

        return hbmp;

    CGColorSpaceRef deviceRGB = CGColorSpaceCreateDeviceRGB();

    CGContextRef bitmapContext = CGBitmapContextCreate(bits, bmpInfo.bmiHeader.biWidth, bmpInfo.bmiHeader.biHeight, 8,

                                                       bmpInfo.bmiHeader.biWidth * 4, deviceRGB, 

                                                       kCGBitmapByteOrder32Little | kCGImageAlphaNoneSkipFirst);

    CGColorSpaceRelease(deviceRGB);

    if (!bitmapContext) {

        DeleteObject(hbmp);

        return 0;

    }

    *targetRef = bitmapContext;

    return hbmp;

}

static CGContextRef createCgContextFromBitmap(HBITMAP bitmap)

{

    BITMAP info;

    GetObject(bitmap, sizeof(info), &info);

    ASSERT(info.bmBitsPixel == 32);

    CGColorSpaceRef deviceRGB = CGColorSpaceCreateDeviceRGB();

    CGContextRef bitmapContext = CGBitmapContextCreate(info.bmBits, info.bmWidth, info.bmHeight, 8,

                                                       info.bmWidthBytes, deviceRGB, kCGBitmapByteOrder32Little | kCGImageAlphaNoneSkipFirst);

    CGColorSpaceRelease(deviceRGB);

    return bitmapContext;

}

DragImageRef scaleDragImage(DragImageRef image, FloatSize scale)

{

    // FIXME: due to the way drag images are done on windows we need 

    // to preprocess the alpha channel <rdar://problem/5015946>

    if (!image)

        return 0;

    CGContextRef targetContext;

    CGContextRef srcContext;

    CGImageRef srcImage;

    IntSize srcSize = dragImageSize(image);

    IntSize dstSize((int)(srcSize.width() * scale.width()), (int)(srcSize.height() * scale.height()));

    HBITMAP hbmp = 0;

    HDC dc = GetDC(0);

    HDC dstDC = CreateCompatibleDC(dc);

    if (!dstDC)

        goto exit;

    hbmp = allocImage(dstDC, dstSize, &targetContext);

    if (!hbmp)

        goto exit;

    srcContext = createCgContextFromBitmap(image);

    srcImage = CGBitmapContextCreateImage(srcContext);

    CGRect rect;

    rect.origin.x = 0;

    rect.origin.y = 0;

    rect.size = dstSize;

    CGContextDrawImage(targetContext, rect, srcImage);

    CGImageRelease(srcImage);

    CGContextRelease(srcContext);

    CGContextRelease(targetContext);

    ::DeleteObject(image);

    image = 0;

exit:

    if (!hbmp)

        hbmp = image;

    if (dstDC)

        DeleteDC(dstDC);

    ReleaseDC(0, dc);

    return hbmp;

}

DragImageRef dissolveDragImageToFraction(DragImageRef image, float)

{

    //We don't do this on windows as the dragimage is blended by the OS

    return image;

}

DragImageRef createDragImageFromImage(Image* img)

{    

    HBITMAP hbmp = 0;

    HDC dc = GetDC(0);

    HDC workingDC = CreateCompatibleDC(dc);

    CGContextRef drawContext = 0;

    if (!workingDC)

        goto exit;

    hbmp = allocImage(workingDC, img->size(), &drawContext);

    if (!hbmp)

        goto exit;

    if (!drawContext) {

        ::DeleteObject(hbmp);

        hbmp = 0;

    }

    CGImageRef srcImage = img->getCGImageRef();

    CGRect rect;

    rect.size = img->size();

    rect.origin.x = 0;

    rect.origin.y = -rect.size.height;

    static const CGFloat white [] = {1.0, 1.0, 1.0, 1.0};

    CGContextScaleCTM(drawContext, 1, -1);

    CGContextSetFillColor(drawContext, white);

    CGContextFillRect(drawContext, rect);

    CGContextSetBlendMode(drawContext, kCGBlendModeNormal);

    CGContextDrawImage(drawContext, rect, srcImage);

    CGContextRelease(drawContext);

exit:

    if (workingDC)

        DeleteDC(workingDC);

    ReleaseDC(0, dc);

    return hbmp;

}

DragImageRef createDragImageIconForCachedImage(CachedImage*)

{

    //FIXME: Provide icon for image type <rdar://problem/5015949>

    return 0;     

}

}