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/*
* Copyright (c) 2010, Google 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
* OWNER 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 "Image.h"
#include "NotImplemented.h"
#include <wtf/RetainPtr.h>
#include <CoreGraphics/CGBitmapContext.h>
#include <CoreGraphics/CGImage.h>
namespace WebCore {
IntSize dragImageSize(DragImageRef image)
{
if (!image)
return IntSize();
return IntSize(CGImageGetWidth(image), CGImageGetHeight(image));
}
void deleteDragImage(DragImageRef image)
{
CGImageRelease(image);
}
DragImageRef scaleDragImage(DragImageRef image, FloatSize scale)
{
if (!image)
return 0;
size_t width = roundf(CGImageGetWidth(image) * scale.width());
size_t height = roundf(CGImageGetHeight(image) * scale.height());
RetainPtr<CGColorSpaceRef> deviceRGB(WTF::AdoptCF, CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB));
CGContextRef context = CGBitmapContextCreate(0, width, height, 8, width * 4, deviceRGB.get(), kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host);
if (!context)
return 0;
CGContextDrawImage(context, CGRectMake(0, 0, width, height), image);
CGImageRelease(image);
CGImageRef scaledImage = CGBitmapContextCreateImage(context);
CGContextRelease(context);
return scaledImage;
}
DragImageRef dissolveDragImageToFraction(DragImageRef image, float delta)
{
if (!image)
return 0;
size_t width = CGImageGetWidth(image);
size_t height = CGImageGetHeight(image);
RetainPtr<CGColorSpaceRef> deviceRGB(WTF::AdoptCF, CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB));
CGContextRef context = CGBitmapContextCreate(0, width, height, 8, width * 4, deviceRGB.get(), kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host);
if (!context)
return 0;
// From CGContext.h:
// The Porter-Duff "source over" mode is called `kCGBlendModeNormal':
// R = S + D*(1 - Sa)
// This is the same as NSCompositeSourceOver, which is what -[NSImage dissolveToPoint:fraction:] uses.
CGContextSetAlpha(context, delta);
CGContextSetBlendMode(context, kCGBlendModeNormal);
CGContextDrawImage(context, CGRectMake(0, 0, width, height), image);
CGImageRelease(image);
CGImageRef dissolvedImage = CGBitmapContextCreateImage(context);
CGContextRelease(context);
return dissolvedImage;
}
DragImageRef createDragImageFromImage(Image* image)
{
if (!image)
return 0;
return CGImageCreateCopy(image->nativeImageForCurrentFrame());
}
DragImageRef createDragImageIconForCachedImage(CachedImage*)
{
notImplemented();
return 0;
}
} // namespace WebCore
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