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// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "config.h"
#include "webkit/glue/image_decoder.h"
#include "base/compiler_specific.h"
MSVC_PUSH_WARNING_LEVEL(0);
#if defined(OS_WIN) || defined(OS_LINUX)
#include "ImageSourceSkia.h"
#elif defined(OS_MACOSX)
#include "ImageSource.h"
#include "RetainPtr.h"
#endif
#include "IntSize.h"
#include "RefPtr.h"
#include "SharedBuffer.h"
MSVC_POP_WARNING();
#include "SkBitmap.h"
namespace webkit_glue {
ImageDecoder::ImageDecoder() : desired_icon_size_(0, 0) {
}
ImageDecoder::ImageDecoder(const gfx::Size& desired_icon_size)
: desired_icon_size_(desired_icon_size) {
}
ImageDecoder::~ImageDecoder() {
}
SkBitmap ImageDecoder::Decode(const unsigned char* data, size_t size) const {
// What's going on here? ImageDecoder is only used by ImageResourceFetcher,
// which is only used (but extensively) by WebViewImpl. On the Mac we're using
// CoreGraphics, but right now WebViewImpl uses SkBitmaps everywhere. For now,
// this is a convenient bottleneck to convert from CGImageRefs to SkBitmaps,
// but in the future we will need to replumb to get CGImageRefs (or whatever
// the native type is) everywhere, directly.
#if defined(OS_WIN) || defined(OS_LINUX)
WebCore::ImageSourceSkia source;
#elif defined(OS_MACOSX)
WebCore::ImageSource source;
#endif
WTF::RefPtr<WebCore::SharedBuffer> buffer(WebCore::SharedBuffer::create(
data, static_cast<int>(size)));
#if defined(OS_WIN) || defined(OS_LINUX)
source.setData(buffer.get(), true,
WebCore::IntSize(desired_icon_size_.width(),
desired_icon_size_.height()));
#elif defined(OS_MACOSX)
source.setData(buffer.get(), true);
#endif
if (!source.isSizeAvailable())
return SkBitmap();
WebCore::NativeImagePtr frame0 = source.createFrameAtIndex(0);
if (!frame0)
return SkBitmap();
#if defined(OS_WIN) || defined(OS_LINUX)
return *reinterpret_cast<SkBitmap*>(frame0);
#elif defined(OS_MACOSX)
// BitmapImage releases automatically, but we're bypassing it so we'll need
// to do the releasing.
RetainPtr<CGImageRef> image(AdoptCF, frame0);
SkBitmap result;
result.setConfig(SkBitmap::kARGB_8888_Config, CGImageGetWidth(image.get()),
CGImageGetHeight(image.get()));
// TODO(port):
// This line is a waste, but is needed when the renderer sends a
// ViewHostMsg_DidDownloadImage and tries to pickle the SkBitmap.
// Presumably this will be removed when we (ImageDecoder::Decode())
// are changed to not return a fake SkBitmap.
result.allocPixels();
RetainPtr<CGColorSpace> cg_color(AdoptCF, CGColorSpaceCreateDeviceRGB());
// The last parameter is a total guess. Feel free to adjust it if images draw
// incorrectly. TODO(avi): Verify byte ordering; it should be possible to
// swizzle bytes with various combinations of the byte order and alpha
// constants.
RetainPtr<CGContextRef> context(AdoptCF, CGBitmapContextCreate(
result.getPixels(),
result.width(),
result.height(),
result.bytesPerPixel() * 8 / 4,
result.rowBytes(),
cg_color.get(),
kCGImageAlphaPremultipliedFirst |
kCGBitmapByteOrder32Host));
CGRect rect = CGRectMake(0, 0,
CGImageGetWidth(image.get()),
CGImageGetHeight(image.get()));
CGContextDrawImage(context.get(), rect, image.get());
return result;
#endif
}
} // namespace webkit_glue
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