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// Copyright 2010 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 "cc/image_layer.h"
#include "CCLayerTreeHost.h"
#include "CCTextureUpdateQueue.h"
#include "base/compiler_specific.h"
#include "cc/layer_texture_updater.h"
#include "cc/platform_color.h"
namespace cc {
class ImageLayerTextureUpdater : public LayerTextureUpdater {
public:
class Texture : public LayerTextureUpdater::Texture {
public:
Texture(ImageLayerTextureUpdater* textureUpdater, scoped_ptr<CCPrioritizedTexture> texture)
: LayerTextureUpdater::Texture(texture.Pass())
, m_textureUpdater(textureUpdater)
{
}
virtual void update(CCTextureUpdateQueue& queue, const IntRect& sourceRect, const IntSize& destOffset, bool partialUpdate, CCRenderingStats&) OVERRIDE
{
textureUpdater()->updateTexture(queue, texture(), sourceRect, destOffset, partialUpdate);
}
private:
ImageLayerTextureUpdater* textureUpdater() { return m_textureUpdater; }
ImageLayerTextureUpdater* m_textureUpdater;
};
static scoped_refptr<ImageLayerTextureUpdater> create()
{
return make_scoped_refptr(new ImageLayerTextureUpdater());
}
virtual scoped_ptr<LayerTextureUpdater::Texture> createTexture(
CCPrioritizedTextureManager* manager) OVERRIDE
{
return scoped_ptr<LayerTextureUpdater::Texture>(new Texture(this, CCPrioritizedTexture::create(manager)));
}
virtual SampledTexelFormat sampledTexelFormat(GLenum textureFormat) OVERRIDE
{
return PlatformColor::sameComponentOrder(textureFormat) ?
LayerTextureUpdater::SampledTexelFormatRGBA : LayerTextureUpdater::SampledTexelFormatBGRA;
}
void updateTexture(CCTextureUpdateQueue& queue, CCPrioritizedTexture* texture, const IntRect& sourceRect, const IntSize& destOffset, bool partialUpdate)
{
// Source rect should never go outside the image pixels, even if this
// is requested because the texture extends outside the image.
IntRect clippedSourceRect = sourceRect;
IntRect imageRect = IntRect(0, 0, m_bitmap.width(), m_bitmap.height());
clippedSourceRect.intersect(imageRect);
IntSize clippedDestOffset = destOffset + IntSize(clippedSourceRect.location() - sourceRect.location());
ResourceUpdate upload = ResourceUpdate::Create(texture,
&m_bitmap,
imageRect,
clippedSourceRect,
clippedDestOffset);
if (partialUpdate)
queue.appendPartialUpload(upload);
else
queue.appendFullUpload(upload);
}
void setBitmap(const SkBitmap& bitmap)
{
m_bitmap = bitmap;
}
private:
ImageLayerTextureUpdater() { }
virtual ~ImageLayerTextureUpdater() { }
SkBitmap m_bitmap;
};
scoped_refptr<ImageLayerChromium> ImageLayerChromium::create()
{
return make_scoped_refptr(new ImageLayerChromium());
}
ImageLayerChromium::ImageLayerChromium()
: TiledLayerChromium()
{
}
ImageLayerChromium::~ImageLayerChromium()
{
}
void ImageLayerChromium::setBitmap(const SkBitmap& bitmap)
{
// setBitmap() currently gets called whenever there is any
// style change that affects the layer even if that change doesn't
// affect the actual contents of the image (e.g. a CSS animation).
// With this check in place we avoid unecessary texture uploads.
if (bitmap.pixelRef() && bitmap.pixelRef() == m_bitmap.pixelRef())
return;
m_bitmap = bitmap;
setNeedsDisplay();
}
void ImageLayerChromium::setTexturePriorities(const CCPriorityCalculator& priorityCalc)
{
// Update the tile data before creating all the layer's tiles.
updateTileSizeAndTilingOption();
TiledLayerChromium::setTexturePriorities(priorityCalc);
}
void ImageLayerChromium::update(CCTextureUpdateQueue& queue, const CCOcclusionTracker* occlusion, CCRenderingStats& stats)
{
createTextureUpdaterIfNeeded();
if (m_needsDisplay) {
m_textureUpdater->setBitmap(m_bitmap);
updateTileSizeAndTilingOption();
invalidateContentRect(IntRect(IntPoint(), contentBounds()));
m_needsDisplay = false;
}
TiledLayerChromium::update(queue, occlusion, stats);
}
void ImageLayerChromium::createTextureUpdaterIfNeeded()
{
if (m_textureUpdater)
return;
m_textureUpdater = ImageLayerTextureUpdater::create();
GLenum textureFormat = layerTreeHost()->rendererCapabilities().bestTextureFormat;
setTextureFormat(textureFormat);
setSampledTexelFormat(textureUpdater()->sampledTexelFormat(textureFormat));
}
LayerTextureUpdater* ImageLayerChromium::textureUpdater() const
{
return m_textureUpdater.get();
}
IntSize ImageLayerChromium::contentBounds() const
{
return IntSize(m_bitmap.width(), m_bitmap.height());
}
bool ImageLayerChromium::drawsContent() const
{
return !m_bitmap.isNull() && TiledLayerChromium::drawsContent();
}
bool ImageLayerChromium::needsContentsScale() const
{
// Contents scale is not need for image layer because this can be done in compositor more efficiently.
return false;
}
}
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