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/*
Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "TextureMapper.h"
#include "FilterOperations.h"
#include "GraphicsLayer.h"
#include "TextureMapperImageBuffer.h"
#include "Timer.h"
#include <wtf/CurrentTime.h>
#include <wtf/NonCopyingSort.h>
#if USE(ACCELERATED_COMPOSITING) && USE(TEXTURE_MAPPER)
namespace WebCore {
struct BitmapTexturePoolEntry {
explicit BitmapTexturePoolEntry(PassRefPtr<BitmapTexture> texture)
: m_texture(texture)
{ }
inline void markUsed() { m_timeLastUsed = monotonicallyIncreasingTime(); }
static bool compareTimeLastUsed(const BitmapTexturePoolEntry& a, const BitmapTexturePoolEntry& b)
{
return a.m_timeLastUsed - b.m_timeLastUsed > 0;
}
RefPtr<BitmapTexture> m_texture;
double m_timeLastUsed;
};
class BitmapTexturePool {
WTF_MAKE_NONCOPYABLE(BitmapTexturePool);
WTF_MAKE_FAST_ALLOCATED;
public:
BitmapTexturePool();
PassRefPtr<BitmapTexture> acquireTexture(const IntSize&, TextureMapper*);
private:
void scheduleReleaseUnusedTextures();
void releaseUnusedTexturesTimerFired(Timer<BitmapTexturePool>*);
Vector<BitmapTexturePoolEntry> m_textures;
Timer<BitmapTexturePool> m_releaseUnusedTexturesTimer;
static const double s_releaseUnusedSecondsTolerance;
static const double s_releaseUnusedTexturesTimerInterval;
};
const double BitmapTexturePool::s_releaseUnusedSecondsTolerance = 3;
const double BitmapTexturePool::s_releaseUnusedTexturesTimerInterval = 0.5;
BitmapTexturePool::BitmapTexturePool()
: m_releaseUnusedTexturesTimer(this, &BitmapTexturePool::releaseUnusedTexturesTimerFired)
{ }
void BitmapTexturePool::scheduleReleaseUnusedTextures()
{
if (m_releaseUnusedTexturesTimer.isActive())
m_releaseUnusedTexturesTimer.stop();
m_releaseUnusedTexturesTimer.startOneShot(s_releaseUnusedTexturesTimerInterval);
}
void BitmapTexturePool::releaseUnusedTexturesTimerFired(Timer<BitmapTexturePool>*)
{
if (m_textures.isEmpty())
return;
// Delete entries, which have been unused in s_releaseUnusedSecondsTolerance.
nonCopyingSort(m_textures.begin(), m_textures.end(), BitmapTexturePoolEntry::compareTimeLastUsed);
double minUsedTime = monotonicallyIncreasingTime() - s_releaseUnusedSecondsTolerance;
for (size_t i = 0; i < m_textures.size(); ++i) {
if (m_textures[i].m_timeLastUsed < minUsedTime) {
m_textures.remove(i, m_textures.size() - i);
break;
}
}
}
PassRefPtr<BitmapTexture> BitmapTexturePool::acquireTexture(const IntSize& size, TextureMapper* textureMapper)
{
BitmapTexturePoolEntry* selectedEntry = 0;
for (size_t i = 0; i < m_textures.size(); ++i) {
BitmapTexturePoolEntry* entry = &m_textures[i];
// If the surface has only one reference (the one in m_textures), we can safely reuse it.
if (entry->m_texture->refCount() > 1)
continue;
if (entry->m_texture->canReuseWith(size)) {
selectedEntry = entry;
break;
}
}
if (!selectedEntry) {
m_textures.append(BitmapTexturePoolEntry(textureMapper->createTexture()));
selectedEntry = &m_textures.last();
}
scheduleReleaseUnusedTextures();
selectedEntry->markUsed();
return selectedEntry->m_texture;
}
PassRefPtr<BitmapTexture> TextureMapper::acquireTextureFromPool(const IntSize& size)
{
RefPtr<BitmapTexture> selectedTexture = m_texturePool->acquireTexture(size, this);
selectedTexture->reset(size, BitmapTexture::SupportsAlpha);
return selectedTexture;
}
PassOwnPtr<TextureMapper> TextureMapper::create(AccelerationMode mode)
{
if (mode == SoftwareMode)
return TextureMapperImageBuffer::create();
return platformCreateAccelerated();
}
TextureMapper::TextureMapper(AccelerationMode accelerationMode)
: m_context(0)
, m_interpolationQuality(InterpolationDefault)
, m_textDrawingMode(TextModeFill)
, m_texturePool(adoptPtr(new BitmapTexturePool()))
, m_accelerationMode(accelerationMode)
, m_isMaskMode(false)
, m_wrapMode(StretchWrap)
{ }
TextureMapper::~TextureMapper()
{ }
void BitmapTexture::updateContents(TextureMapper* textureMapper, GraphicsLayer* sourceLayer, const IntRect& targetRect, const IntPoint& offset, UpdateContentsFlag updateContentsFlag)
{
OwnPtr<ImageBuffer> imageBuffer = ImageBuffer::create(targetRect.size());
GraphicsContext* context = imageBuffer->context();
context->setImageInterpolationQuality(textureMapper->imageInterpolationQuality());
context->setTextDrawingMode(textureMapper->textDrawingMode());
IntRect sourceRect(targetRect);
sourceRect.setLocation(offset);
context->translate(-offset.x(), -offset.y());
sourceLayer->paintGraphicsLayerContents(*context, sourceRect);
RefPtr<Image> image = imageBuffer->copyImage(DontCopyBackingStore);
updateContents(image.get(), targetRect, IntPoint(), updateContentsFlag);
}
} // namespace
#endif
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