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/*
* Copyright (C) 2010 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"
#if USE(ACCELERATED_COMPOSITING)
#include "ContentLayerChromium.h"
#include "cc/CCLayerImpl.h"
#include "GraphicsContext3D.h"
#include "LayerRendererChromium.h"
#include "LayerTexture.h"
#include "RenderLayerBacking.h"
#include "TextStream.h"
// Maximum size the width or height of this layer can be before enabling tiling
// when m_tilingOption == AutoTile.
static int maxUntiledSize = 512;
// When tiling is enabled, use tiles of this dimension squared.
static int defaultTileSize = 256;
using namespace std;
namespace WebCore {
PassRefPtr<ContentLayerChromium> ContentLayerChromium::create(GraphicsLayerChromium* owner)
{
return adoptRef(new ContentLayerChromium(owner));
}
ContentLayerChromium::ContentLayerChromium(GraphicsLayerChromium* owner)
: LayerChromium(owner)
, m_tilingOption(ContentLayerChromium::AutoTile)
{
}
ContentLayerChromium::~ContentLayerChromium()
{
m_tiler.clear();
LayerChromium::cleanupResources();
}
class ContentLayerPainter : public TilePaintInterface {
public:
explicit ContentLayerPainter(GraphicsLayerChromium* owner)
: m_owner(owner)
{
}
virtual void paint(GraphicsContext& context, const IntRect& contentRect)
{
context.save();
context.clearRect(contentRect);
context.clip(contentRect);
m_owner->paintGraphicsLayerContents(context, contentRect);
context.restore();
}
private:
GraphicsLayerChromium* m_owner;
};
void ContentLayerChromium::paintContentsIfDirty(const IntRect& targetSurfaceRect)
{
ASSERT(drawsContent());
ASSERT(layerRenderer());
createTilerIfNeeded();
ContentLayerPainter painter(m_owner);
updateLayerSize(layerBounds().size());
IntRect layerRect = visibleLayerRect(targetSurfaceRect);
if (layerRect.isEmpty())
return;
IntRect dirty = enclosingIntRect(m_dirtyRect);
dirty.intersect(layerBounds());
m_tiler->invalidateRect(dirty);
m_tiler->update(painter, layerRect);
m_dirtyRect = FloatRect();
}
void ContentLayerChromium::setLayerRenderer(LayerRendererChromium* layerRenderer)
{
LayerChromium::setLayerRenderer(layerRenderer);
createTilerIfNeeded();
m_tiler->setLayerRenderer(layerRenderer);
}
TransformationMatrix ContentLayerChromium::tilingTransform()
{
TransformationMatrix transform = ccLayerImpl()->drawTransform();
// Tiler draws from the upper left corner. The draw transform
// specifies the middle of the layer.
IntSize size = bounds();
transform.translate(-size.width() / 2.0, -size.height() / 2.0);
return transform;
}
IntRect ContentLayerChromium::visibleLayerRect(const IntRect& targetSurfaceRect)
{
if (targetSurfaceRect.isEmpty())
return targetSurfaceRect;
const IntRect layerBoundRect = layerBounds();
const TransformationMatrix transform = tilingTransform();
// Is this layer fully contained within the target surface?
IntRect layerInSurfaceSpace = transform.mapRect(layerBoundRect);
if (targetSurfaceRect.contains(layerInSurfaceSpace))
return layerBoundRect;
// If the layer doesn't fill up the entire surface, then find the part of
// the surface rect where the layer could be visible. This avoids trying to
// project surface rect points that are behind the projection point.
IntRect minimalSurfaceRect = targetSurfaceRect;
minimalSurfaceRect.intersect(layerInSurfaceSpace);
// Project the corners of the target surface rect into the layer space.
// This bounding rectangle may be larger than it needs to be (being
// axis-aligned), but is a reasonable filter on the space to consider.
// Non-invertible transforms will create an empty rect here.
const TransformationMatrix surfaceToLayer = transform.inverse();
IntRect layerRect = surfaceToLayer.projectQuad(FloatQuad(FloatRect(minimalSurfaceRect))).enclosingBoundingBox();
layerRect.intersect(layerBoundRect);
return layerRect;
}
IntRect ContentLayerChromium::layerBounds() const
{
return IntRect(IntPoint(0, 0), bounds());
}
void ContentLayerChromium::updateLayerSize(const IntSize& layerSize)
{
if (!m_tiler)
return;
const IntSize tileSize(min(defaultTileSize, layerSize.width()), min(defaultTileSize, layerSize.height()));
const bool autoTiled = layerSize.width() > maxUntiledSize || layerSize.height() > maxUntiledSize;
bool isTiled;
if (m_tilingOption == AlwaysTile)
isTiled = true;
else if (m_tilingOption == NeverTile)
isTiled = false;
else
isTiled = autoTiled;
m_tiler->setTileSize(isTiled ? tileSize : layerSize);
}
void ContentLayerChromium::draw(const IntRect& targetSurfaceRect)
{
const TransformationMatrix transform = tilingTransform();
IntRect layerRect = visibleLayerRect(targetSurfaceRect);
if (!layerRect.isEmpty())
m_tiler->draw(layerRect, transform, ccLayerImpl()->drawOpacity());
}
void ContentLayerChromium::createTilerIfNeeded()
{
if (m_tiler)
return;
m_tiler = LayerTilerChromium::create(layerRenderer(), IntSize(defaultTileSize, defaultTileSize), LayerTilerChromium::HasBorderTexels);
}
void ContentLayerChromium::updateCompositorResources()
{
m_tiler->uploadCanvas();
}
void ContentLayerChromium::setTilingOption(TilingOption option)
{
m_tilingOption = option;
updateLayerSize(bounds());
}
void ContentLayerChromium::bindContentsTexture()
{
// This function is only valid for single texture layers, e.g. masks.
ASSERT(m_tilingOption == NeverTile);
ASSERT(m_tiler);
LayerTexture* texture = m_tiler->getSingleTexture();
ASSERT(texture);
texture->bindTexture();
}
void ContentLayerChromium::setIsMask(bool isMask)
{
setTilingOption(isMask ? NeverTile : AutoTile);
}
static void writeIndent(TextStream& ts, int indent)
{
for (int i = 0; i != indent; ++i)
ts << " ";
}
void ContentLayerChromium::dumpLayerProperties(TextStream& ts, int indent) const
{
LayerChromium::dumpLayerProperties(ts, indent);
writeIndent(ts, indent);
ts << "skipsDraw: " << m_tiler->skipsDraw() << "\n";
}
}
#endif // USE(ACCELERATED_COMPOSITING)
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