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/*
* Copyright (C) 2009 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 "WebImage.h"
#include "Image.h"
#include "ImageSource.h"
#include "SharedBuffer.h"
#include "WebData.h"
#include "WebSize.h"
#include <CoreGraphics/CGImage.h>
#include <wtf/PassRefPtr.h>
#include <wtf/RetainPtr.h>
using namespace WebCore;
namespace WebKit {
WebImage WebImage::fromData(const WebData& data, const WebSize& desiredSize)
{
ImageSource source;
source.setData(PassRefPtr<SharedBuffer>(data).get(), true);
if (!source.isSizeAvailable())
return WebImage();
// Frames are arranged by decreasing size, then decreasing bit depth.
// Pick the frame closest to |desiredSize|'s area without being smaller,
// which has the highest bit depth.
const size_t frameCount = source.frameCount();
size_t index = 0; // Default to first frame if none are large enough.
int frameAreaAtIndex = 0;
for (size_t i = 0; i < frameCount; ++i) {
const IntSize frameSize = source.frameSizeAtIndex(i);
if (WebSize(frameSize) == desiredSize) {
index = i;
break; // Perfect match.
}
const int frameArea = frameSize.width() * frameSize.height();
if (frameArea < (desiredSize.width * desiredSize.height))
break; // No more frames that are large enough.
if (!i || (frameArea < frameAreaAtIndex)) {
index = i; // Closer to desired area than previous best match.
frameAreaAtIndex = frameArea;
}
}
RetainPtr<CGImageRef> frame(AdoptCF, source.createFrameAtIndex(index));
if (!frame)
return WebImage();
return WebImage(frame.get());
}
void WebImage::reset()
{
CGImageRelease(m_imageRef);
m_imageRef = 0;
}
void WebImage::assign(const WebImage& image)
{
assign(image.m_imageRef);
}
bool WebImage::isNull() const
{
return !m_imageRef;
}
WebSize WebImage::size() const
{
return WebSize(CGImageGetWidth(m_imageRef), CGImageGetHeight(m_imageRef));
}
WebImage::WebImage(const PassRefPtr<Image>& image)
: m_imageRef(0)
{
NativeImagePtr p;
if (image.get() && (p = image->nativeImageForCurrentFrame()))
assign(p);
}
WebImage& WebImage::operator=(const PassRefPtr<Image>& image)
{
NativeImagePtr p;
if (image.get() && (p = image->nativeImageForCurrentFrame()))
assign(p);
else
reset();
return *this;
}
void WebImage::assign(CGImageRef imageRef)
{
// Make sure to retain the imageRef first incase m_imageRef == imageRef.
CGImageRetain(imageRef);
CGImageRelease(m_imageRef);
m_imageRef = imageRef;
}
} // namespace WebKit
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