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/*
* Copyright (c) 2008, 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 "skia/ext/image_operations.h"
#include "NativeImageSkia.h"
#include "GraphicsContext3D.h"
#include "MemoryInstrumentationSkia.h"
#include "PlatformInstrumentation.h"
#include "PlatformMemoryInstrumentation.h"
#include "SkPixelRef.h"
#include "SkiaUtils.h"
namespace WebCore {
NativeImageSkia::NativeImageSkia()
: m_resolutionScale(1),
m_resizeRequests(0)
{
}
NativeImageSkia::NativeImageSkia(const SkBitmap& other, float resolutionScale)
: m_image(other),
m_resolutionScale(resolutionScale),
m_resizeRequests(0)
{
}
NativeImageSkia::~NativeImageSkia()
{
}
int NativeImageSkia::decodedSize() const
{
return m_image.getSize() + m_resizedImage.getSize();
}
bool NativeImageSkia::hasResizedBitmap(const SkISize& scaledImageSize, const SkIRect& scaledImageSubset) const
{
bool imageScaleEqual = m_cachedImageInfo.scaledImageSize == scaledImageSize;
bool scaledImageSubsetAvailable = m_cachedImageInfo.scaledImageSubset.contains(scaledImageSubset);
return imageScaleEqual && scaledImageSubsetAvailable && !m_resizedImage.empty();
}
SkBitmap NativeImageSkia::resizedBitmap(const SkISize& scaledImageSize, const SkIRect& scaledImageSubset) const
{
if (!hasResizedBitmap(scaledImageSize, scaledImageSubset)) {
bool shouldCache = isDataComplete()
&& shouldCacheResampling(scaledImageSize, scaledImageSubset);
PlatformInstrumentation::willResizeImage(shouldCache);
SkBitmap resizedImage = skia::ImageOperations::Resize(m_image, skia::ImageOperations::RESIZE_LANCZOS3, scaledImageSize.width(), scaledImageSize.height(), scaledImageSubset);
resizedImage.setImmutable();
PlatformInstrumentation::didResizeImage();
if (!shouldCache)
return resizedImage;
m_resizedImage = resizedImage;
}
SkBitmap resizedSubset;
SkIRect resizedSubsetRect = m_cachedImageInfo.rectInSubset(scaledImageSubset);
m_resizedImage.extractSubset(&resizedSubset, resizedSubsetRect);
return resizedSubset;
}
bool NativeImageSkia::shouldCacheResampling(const SkISize& scaledImageSize, const SkIRect& scaledImageSubset) const
{
// Check whether the requested dimensions match previous request.
bool matchesPreviousRequest = m_cachedImageInfo.isEqual(scaledImageSize, scaledImageSubset);
if (matchesPreviousRequest)
++m_resizeRequests;
else {
m_cachedImageInfo.set(scaledImageSize, scaledImageSubset);
m_resizeRequests = 0;
// Reset m_resizedImage now, because we don't distinguish
// between the last requested resize info and m_resizedImage's
// resize info.
m_resizedImage.reset();
}
// We can not cache incomplete frames. This might be a good optimization in
// the future, were we know how much of the frame has been decoded, so when
// we incrementally draw more of the image, we only have to resample the
// parts that are changed.
if (!isDataComplete())
return false;
// If the destination bitmap is excessively large, we'll never allow caching.
static const unsigned long long kLargeBitmapSize = 4096ULL * 4096ULL;
unsigned long long fullSize = static_cast<unsigned long long>(scaledImageSize.width()) * static_cast<unsigned long long>(scaledImageSize.height());
unsigned long long fragmentSize = static_cast<unsigned long long>(scaledImageSubset.width()) * static_cast<unsigned long long>(scaledImageSubset.height());
if (fragmentSize > kLargeBitmapSize)
return false;
// If the destination bitmap is small, we'll always allow caching, since
// there is not very much penalty for computing it and it may come in handy.
static const unsigned kSmallBitmapSize = 4096;
if (fragmentSize <= kSmallBitmapSize)
return true;
// If "too many" requests have been made for this bitmap, we assume that
// many more will be made as well, and we'll go ahead and cache it.
static const int kManyRequestThreshold = 4;
if (m_resizeRequests >= kManyRequestThreshold)
return true;
// If more than 1/4 of the resized image is requested, it's worth caching.
return fragmentSize > fullSize / 4;
}
NativeImageSkia::CachedImageInfo::CachedImageInfo()
{
scaledImageSize.setEmpty();
scaledImageSubset.setEmpty();
}
bool NativeImageSkia::CachedImageInfo::isEqual(const SkISize& otherScaledImageSize, const SkIRect& otherScaledImageSubset) const
{
return scaledImageSize == otherScaledImageSize && scaledImageSubset == otherScaledImageSubset;
}
void NativeImageSkia::CachedImageInfo::set(const SkISize& otherScaledImageSize, const SkIRect& otherScaledImageSubset)
{
scaledImageSize = otherScaledImageSize;
scaledImageSubset = otherScaledImageSubset;
}
SkIRect NativeImageSkia::CachedImageInfo::rectInSubset(const SkIRect& otherScaledImageSubset)
{
if (!scaledImageSubset.contains(otherScaledImageSubset))
return SkIRect::MakeEmpty();
SkIRect subsetRect = otherScaledImageSubset;
subsetRect.offset(-scaledImageSubset.x(), -scaledImageSubset.y());
return subsetRect;
}
void NativeImageSkia::reportMemoryUsage(MemoryObjectInfo* memoryObjectInfo) const
{
MemoryClassInfo info(memoryObjectInfo, this);
info.addMember(m_image);
info.addMember(m_resizedImage);
}
void reportMemoryUsage(const NativeImageSkia* const& image, MemoryObjectInfo* memoryObjectInfo)
{
image->reportMemoryUsage(memoryObjectInfo);
}
} // namespace WebCore
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