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|
/*
* Copyright (C) 2012 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:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS 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 APPLE OR ITS 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 "cc/CCOcclusionTracker.h"
#include "LayerChromium.h"
#include "cc/CCLayerImpl.h"
#include "cc/CCMathUtil.h"
#include "cc/CCOverdrawMetrics.h"
#include <algorithm>
using namespace std;
using WebKit::WebTransformationMatrix;
namespace WebCore {
template<typename LayerType, typename RenderSurfaceType>
CCOcclusionTrackerBase<LayerType, RenderSurfaceType>::CCOcclusionTrackerBase(IntRect scissorRectInScreenSpace, bool recordMetricsForFrame)
: m_scissorRectInScreenSpace(scissorRectInScreenSpace)
, m_overdrawMetrics(CCOverdrawMetrics::create(recordMetricsForFrame))
, m_occludingScreenSpaceRects(0)
{
}
template<typename LayerType, typename RenderSurfaceType>
void CCOcclusionTrackerBase<LayerType, RenderSurfaceType>::enterLayer(const CCLayerIteratorPosition<LayerType>& layerIterator)
{
LayerType* renderTarget = layerIterator.targetRenderSurfaceLayer;
if (layerIterator.representsItself)
enterRenderTarget(renderTarget);
else if (layerIterator.representsTargetRenderSurface)
finishedRenderTarget(renderTarget);
}
template<typename LayerType, typename RenderSurfaceType>
void CCOcclusionTrackerBase<LayerType, RenderSurfaceType>::leaveLayer(const CCLayerIteratorPosition<LayerType>& layerIterator)
{
LayerType* renderTarget = layerIterator.targetRenderSurfaceLayer;
if (layerIterator.representsItself)
markOccludedBehindLayer(layerIterator.currentLayer);
else if (layerIterator.representsContributingRenderSurface)
leaveToRenderTarget(renderTarget);
}
template<typename LayerType, typename RenderSurfaceType>
void CCOcclusionTrackerBase<LayerType, RenderSurfaceType>::enterRenderTarget(const LayerType* newTarget)
{
if (!m_stack.isEmpty() && m_stack.last().target == newTarget)
return;
const LayerType* oldTarget = m_stack.isEmpty() ? 0 : m_stack.last().target;
const RenderSurfaceType* oldAncestorThatMovesPixels = !oldTarget ? 0 : oldTarget->renderSurface()->nearestAncestorThatMovesPixels();
const RenderSurfaceType* newAncestorThatMovesPixels = newTarget->renderSurface()->nearestAncestorThatMovesPixels();
m_stack.append(StackObject(newTarget));
// We copy the screen occlusion into the new RenderSurface subtree, but we never copy in the
// target occlusion, since we are looking at a new RenderSurface target.
// If we are entering a subtree that is going to move pixels around, then the occlusion we've computed
// so far won't apply to the pixels we're drawing here in the same way. We discard the occlusion thus
// far to be safe, and ensure we don't cull any pixels that are moved such that they become visible.
bool enteringSubtreeThatMovesPixels = newAncestorThatMovesPixels && newAncestorThatMovesPixels != oldAncestorThatMovesPixels;
bool copyScreenOcclusionForward = m_stack.size() > 1 && !enteringSubtreeThatMovesPixels;
if (copyScreenOcclusionForward) {
int lastIndex = m_stack.size() - 1;
m_stack[lastIndex].occlusionInScreen = m_stack[lastIndex - 1].occlusionInScreen;
}
}
static inline bool layerOpacityKnown(const LayerChromium* layer) { return !layer->drawOpacityIsAnimating(); }
static inline bool layerOpacityKnown(const CCLayerImpl*) { return true; }
static inline bool layerTransformsToTargetKnown(const LayerChromium* layer) { return !layer->drawTransformIsAnimating(); }
static inline bool layerTransformsToTargetKnown(const CCLayerImpl*) { return true; }
static inline bool layerTransformsToScreenKnown(const LayerChromium* layer) { return !layer->screenSpaceTransformIsAnimating(); }
static inline bool layerTransformsToScreenKnown(const CCLayerImpl*) { return true; }
static inline bool surfaceOpacityKnown(const RenderSurfaceChromium* surface) { return !surface->drawOpacityIsAnimating(); }
static inline bool surfaceOpacityKnown(const CCRenderSurface*) { return true; }
static inline bool surfaceTransformsToTargetKnown(const RenderSurfaceChromium* surface) { return !surface->targetSurfaceTransformsAreAnimating(); }
static inline bool surfaceTransformsToTargetKnown(const CCRenderSurface*) { return true; }
static inline bool surfaceTransformsToScreenKnown(const RenderSurfaceChromium* surface) { return !surface->screenSpaceTransformsAreAnimating(); }
static inline bool surfaceTransformsToScreenKnown(const CCRenderSurface*) { return true; }
static inline bool layerIsInUnsorted3dRenderingContext(const LayerChromium* layer) { return layer->parent() && layer->parent()->preserves3D(); }
static inline bool layerIsInUnsorted3dRenderingContext(const CCLayerImpl*) { return false; }
template<typename LayerType, typename RenderSurfaceType>
void CCOcclusionTrackerBase<LayerType, RenderSurfaceType>::finishedRenderTarget(const LayerType* finishedTarget)
{
// Make sure we know about the target surface.
enterRenderTarget(finishedTarget);
RenderSurfaceType* surface = finishedTarget->renderSurface();
// If the occlusion within the surface can not be applied to things outside of the surface's subtree, then clear the occlusion here so it won't be used.
if (finishedTarget->maskLayer() || !surfaceOpacityKnown(surface) || surface->drawOpacity() < 1 || finishedTarget->filters().hasFilterThatAffectsOpacity()) {
m_stack.last().occlusionInScreen = Region();
m_stack.last().occlusionInTarget = Region();
} else {
if (!surfaceTransformsToTargetKnown(surface))
m_stack.last().occlusionInTarget = Region();
if (!surfaceTransformsToScreenKnown(surface))
m_stack.last().occlusionInScreen = Region();
}
}
template<typename RenderSurfaceType>
static inline Region transformSurfaceOpaqueRegion(const RenderSurfaceType* surface, const Region& region, const WebTransformationMatrix& transform)
{
// Verify that rects within the |surface| will remain rects in its target surface after applying |transform|. If this is true, then
// apply |transform| to each rect within |region| in order to transform the entire Region.
bool clipped;
FloatQuad transformedBoundsQuad = CCMathUtil::mapQuad(transform, FloatQuad(region.bounds()), clipped);
// FIXME: Find a rect interior to each transformed quad.
if (clipped || !transformedBoundsQuad.isRectilinear())
return Region();
Region transformedRegion;
Vector<IntRect> rects = region.rects();
for (size_t i = 0; i < rects.size(); ++i) {
// We've already checked for clipping in the mapQuad call above, these calls should not clip anything further.
IntRect transformedRect = enclosedIntRect(CCMathUtil::mapClippedRect(transform, FloatRect(rects[i])));
if (!surface->clipRect().isEmpty())
transformedRect.intersect(surface->clipRect());
transformedRegion.unite(transformedRect);
}
return transformedRegion;
}
static inline void reduceOcclusion(const IntRect& affectedArea, const IntRect& expandedPixel, Region& occlusion)
{
if (affectedArea.isEmpty())
return;
Region affectedOcclusion = intersect(occlusion, affectedArea);
Vector<IntRect> affectedOcclusionRects = affectedOcclusion.rects();
occlusion.subtract(affectedArea);
for (size_t j = 0; j < affectedOcclusionRects.size(); ++j) {
IntRect& occlusionRect = affectedOcclusionRects[j];
// Shrink the rect by expanding the non-opaque pixels outside the rect.
// The expandedPixel is the IntRect for a single pixel after being
// expanded by filters on the layer. The original pixel would be
// IntRect(0, 0, 1, 1), and the expanded pixel is the rect, relative
// to this original rect, that the original pixel can influence after
// being filtered.
// To convert the expandedPixel IntRect back to filter outsets:
// x = -leftOutset
// width = leftOutset + rightOutset
// maxX = x + width = -leftOutset + leftOutset + rightOutset = rightOutset
// The leftOutset of the filters moves pixels on the right side of
// the occlusionRect into it, shrinking its right edge.
int shrinkLeft = occlusionRect.x() == affectedArea.x() ? 0 : expandedPixel.maxX();
int shrinkTop = occlusionRect.y() == affectedArea.y() ? 0 : expandedPixel.maxY();
int shrinkRight = occlusionRect.maxX() == affectedArea.maxX() ? 0 : -expandedPixel.x();
int shrinkBottom = occlusionRect.maxY() == affectedArea.maxY() ? 0 : -expandedPixel.y();
occlusionRect.move(shrinkLeft, shrinkTop);
occlusionRect.contract(shrinkLeft + shrinkRight, shrinkTop + shrinkBottom);
occlusion.unite(occlusionRect);
}
}
template<typename LayerType>
static void reduceOcclusionBelowSurface(LayerType* contributingLayer, const IntRect& surfaceRect, const WebTransformationMatrix& surfaceTransform, LayerType* renderTarget, Region& occlusionInTarget, Region& occlusionInScreen)
{
if (surfaceRect.isEmpty())
return;
IntRect boundsInTarget = enclosingIntRect(CCMathUtil::mapClippedRect(surfaceTransform, FloatRect(surfaceRect)));
if (!contributingLayer->renderSurface()->clipRect().isEmpty())
boundsInTarget.intersect(contributingLayer->renderSurface()->clipRect());
int outsetTop, outsetRight, outsetBottom, outsetLeft;
contributingLayer->backgroundFilters().getOutsets(outsetTop, outsetRight, outsetBottom, outsetLeft);
// The filter can move pixels from outside of the clip, so allow affectedArea to expand outside the clip.
boundsInTarget.move(-outsetLeft, -outsetTop);
boundsInTarget.expand(outsetLeft + outsetRight, outsetTop + outsetBottom);
IntRect boundsInScreen = enclosingIntRect(CCMathUtil::mapClippedRect(renderTarget->renderSurface()->screenSpaceTransform(), FloatRect(boundsInTarget)));
IntRect filterOutsetsInTarget(-outsetLeft, -outsetTop, outsetLeft + outsetRight, outsetTop + outsetBottom);
IntRect filterOutsetsInScreen = enclosingIntRect(CCMathUtil::mapClippedRect(renderTarget->renderSurface()->screenSpaceTransform(), FloatRect(filterOutsetsInTarget)));
reduceOcclusion(boundsInTarget, filterOutsetsInTarget, occlusionInTarget);
reduceOcclusion(boundsInScreen, filterOutsetsInScreen, occlusionInScreen);
}
template<typename LayerType, typename RenderSurfaceType>
void CCOcclusionTrackerBase<LayerType, RenderSurfaceType>::leaveToRenderTarget(const LayerType* newTarget)
{
int lastIndex = m_stack.size() - 1;
bool surfaceWillBeAtTopAfterPop = m_stack.size() > 1 && m_stack[lastIndex - 1].target == newTarget;
// We merge the screen occlusion from the current RenderSurface subtree out to its parent target RenderSurface.
// The target occlusion can be merged out as well but needs to be transformed to the new target.
const LayerType* oldTarget = m_stack[lastIndex].target;
const RenderSurfaceType* oldSurface = oldTarget->renderSurface();
Region oldTargetOcclusionInNewTarget = transformSurfaceOpaqueRegion<RenderSurfaceType>(oldSurface, m_stack[lastIndex].occlusionInTarget, oldSurface->originTransform());
if (oldTarget->hasReplica() && !oldTarget->replicaHasMask())
oldTargetOcclusionInNewTarget.unite(transformSurfaceOpaqueRegion<RenderSurfaceType>(oldSurface, m_stack[lastIndex].occlusionInTarget, oldSurface->replicaOriginTransform()));
IntRect unoccludedSurfaceRect;
IntRect unoccludedReplicaRect;
if (oldTarget->backgroundFilters().hasFilterThatMovesPixels()) {
unoccludedSurfaceRect = unoccludedContributingSurfaceContentRect(oldTarget, false, oldSurface->contentRect());
if (oldTarget->hasReplica())
unoccludedReplicaRect = unoccludedContributingSurfaceContentRect(oldTarget, true, oldSurface->contentRect());
}
if (surfaceWillBeAtTopAfterPop) {
// Merge the top of the stack down.
m_stack[lastIndex - 1].occlusionInScreen.unite(m_stack[lastIndex].occlusionInScreen);
m_stack[lastIndex - 1].occlusionInTarget.unite(oldTargetOcclusionInNewTarget);
m_stack.removeLast();
} else {
// Replace the top of the stack with the new pushed surface. Copy the occluded screen region to the top.
m_stack.last().target = newTarget;
m_stack.last().occlusionInTarget = oldTargetOcclusionInNewTarget;
}
if (oldTarget->backgroundFilters().hasFilterThatMovesPixels()) {
reduceOcclusionBelowSurface(oldTarget, unoccludedSurfaceRect, oldSurface->originTransform(), newTarget, m_stack.last().occlusionInTarget, m_stack.last().occlusionInScreen);
if (oldTarget->hasReplica())
reduceOcclusionBelowSurface(oldTarget, unoccludedReplicaRect, oldSurface->replicaOriginTransform(), newTarget, m_stack.last().occlusionInTarget, m_stack.last().occlusionInScreen);
}
}
template<typename LayerType>
static inline WebTransformationMatrix contentToScreenSpaceTransform(const LayerType* layer)
{
ASSERT(layerTransformsToScreenKnown(layer));
IntSize boundsInLayerSpace = layer->bounds();
IntSize boundsInContentSpace = layer->contentBounds();
WebTransformationMatrix transform = layer->screenSpaceTransform();
if (boundsInContentSpace.isEmpty())
return transform;
// Scale from content space to layer space
transform.scaleNonUniform(boundsInLayerSpace.width() / static_cast<double>(boundsInContentSpace.width()),
boundsInLayerSpace.height() / static_cast<double>(boundsInContentSpace.height()));
return transform;
}
template<typename LayerType>
static inline WebTransformationMatrix contentToTargetSurfaceTransform(const LayerType* layer)
{
ASSERT(layerTransformsToTargetKnown(layer));
IntSize boundsInLayerSpace = layer->bounds();
IntSize boundsInContentSpace = layer->contentBounds();
WebTransformationMatrix transform = layer->drawTransform();
if (boundsInContentSpace.isEmpty())
return transform;
// Scale from content space to layer space
transform.scaleNonUniform(boundsInLayerSpace.width() / static_cast<double>(boundsInContentSpace.width()),
boundsInLayerSpace.height() / static_cast<double>(boundsInContentSpace.height()));
// The draw transform expects the origin to be in the middle of the layer.
transform.translate(-boundsInContentSpace.width() / 2.0, -boundsInContentSpace.height() / 2.0);
return transform;
}
// FIXME: Remove usePaintTracking when paint tracking is on for paint culling.
template<typename LayerType>
static inline void addOcclusionBehindLayer(Region& region, const LayerType* layer, const WebTransformationMatrix& transform, const Region& opaqueContents, const IntRect& scissorRect, const IntSize& minimumTrackingSize, Vector<IntRect>* occludingScreenSpaceRects)
{
ASSERT(layer->visibleContentRect().contains(opaqueContents.bounds()));
bool clipped;
FloatQuad visibleTransformedQuad = CCMathUtil::mapQuad(transform, FloatQuad(layer->visibleContentRect()), clipped);
// FIXME: Find a rect interior to each transformed quad.
if (clipped || !visibleTransformedQuad.isRectilinear())
return;
Vector<IntRect> contentRects = opaqueContents.rects();
for (size_t i = 0; i < contentRects.size(); ++i) {
// We've already checked for clipping in the mapQuad call above, these calls should not clip anything further.
IntRect transformedRect = enclosedIntRect(CCMathUtil::mapClippedRect(transform, FloatRect(contentRects[i])));
transformedRect.intersect(scissorRect);
if (transformedRect.width() >= minimumTrackingSize.width() || transformedRect.height() >= minimumTrackingSize.height()) {
if (occludingScreenSpaceRects)
occludingScreenSpaceRects->append(transformedRect);
region.unite(transformedRect);
}
}
}
template<typename LayerType, typename RenderSurfaceType>
void CCOcclusionTrackerBase<LayerType, RenderSurfaceType>::markOccludedBehindLayer(const LayerType* layer)
{
ASSERT(!m_stack.isEmpty());
ASSERT(layer->renderTarget() == m_stack.last().target);
if (m_stack.isEmpty())
return;
if (!layerOpacityKnown(layer) || layer->drawOpacity() < 1)
return;
if (layerIsInUnsorted3dRenderingContext(layer))
return;
Region opaqueContents = layer->visibleContentOpaqueRegion();
if (opaqueContents.isEmpty())
return;
IntRect scissorInTarget = layerScissorRectInTargetSurface(layer);
if (layerTransformsToTargetKnown(layer))
addOcclusionBehindLayer<LayerType>(m_stack.last().occlusionInTarget, layer, contentToTargetSurfaceTransform<LayerType>(layer), opaqueContents, scissorInTarget, m_minimumTrackingSize, 0);
// We must clip the occlusion within the layer's scissorInTarget within screen space as well. If the scissor rect can't be moved to screen space and
// remain rectilinear, then we don't add any occlusion in screen space.
if (layerTransformsToScreenKnown(layer)) {
WebTransformationMatrix targetToScreenTransform = m_stack.last().target->renderSurface()->screenSpaceTransform();
bool clipped;
FloatQuad scissorInScreenQuad = CCMathUtil::mapQuad(targetToScreenTransform, FloatQuad(FloatRect(scissorInTarget)), clipped);
// FIXME: Find a rect interior to the transformed scissor quad.
if (clipped || !scissorInScreenQuad.isRectilinear())
return;
IntRect scissorInScreenRect = intersection(m_scissorRectInScreenSpace, enclosedIntRect(scissorInScreenQuad.boundingBox()));
addOcclusionBehindLayer<LayerType>(m_stack.last().occlusionInScreen, layer, contentToScreenSpaceTransform<LayerType>(layer), opaqueContents, scissorInScreenRect, m_minimumTrackingSize, m_occludingScreenSpaceRects);
}
}
static inline bool testContentRectOccluded(const IntRect& contentRect, const WebTransformationMatrix& contentSpaceTransform, const IntRect& scissorRect, const Region& occlusion)
{
FloatRect transformedRect = CCMathUtil::mapClippedRect(contentSpaceTransform, FloatRect(contentRect));
// Take the enclosingIntRect, as we want to include partial pixels in the test.
IntRect targetRect = intersection(enclosingIntRect(transformedRect), scissorRect);
return targetRect.isEmpty() || occlusion.contains(targetRect);
}
template<typename LayerType, typename RenderSurfaceType>
bool CCOcclusionTrackerBase<LayerType, RenderSurfaceType>::occluded(const LayerType* layer, const IntRect& contentRect, bool* hasOcclusionFromOutsideTargetSurface) const
{
if (hasOcclusionFromOutsideTargetSurface)
*hasOcclusionFromOutsideTargetSurface = false;
ASSERT(!m_stack.isEmpty());
if (m_stack.isEmpty())
return false;
if (contentRect.isEmpty())
return true;
ASSERT(layer->renderTarget() == m_stack.last().target);
if (layerTransformsToTargetKnown(layer) && testContentRectOccluded(contentRect, contentToTargetSurfaceTransform<LayerType>(layer), layerScissorRectInTargetSurface(layer), m_stack.last().occlusionInTarget))
return true;
if (layerTransformsToScreenKnown(layer) && testContentRectOccluded(contentRect, contentToScreenSpaceTransform<LayerType>(layer), m_scissorRectInScreenSpace, m_stack.last().occlusionInScreen)) {
if (hasOcclusionFromOutsideTargetSurface)
*hasOcclusionFromOutsideTargetSurface = true;
return true;
}
return false;
}
// Determines what portion of rect, if any, is unoccluded (not occluded by region). If
// the resulting unoccluded region is not rectangular, we return a rect containing it.
static inline IntRect rectSubtractRegion(const IntRect& rect, const Region& region)
{
Region rectRegion(rect);
rectRegion.subtract(region);
return rectRegion.bounds();
}
static inline IntRect computeUnoccludedContentRect(const IntRect& contentRect, const WebTransformationMatrix& contentSpaceTransform, const IntRect& scissorRect, const Region& occlusion)
{
if (!contentSpaceTransform.isInvertible())
return contentRect;
// Take the enclosingIntRect at each step, as we want to contain any unoccluded partial pixels in the resulting IntRect.
FloatRect transformedRect = CCMathUtil::mapClippedRect(contentSpaceTransform, FloatRect(contentRect));
IntRect shrunkRect = rectSubtractRegion(intersection(enclosingIntRect(transformedRect), scissorRect), occlusion);
IntRect unoccludedRect = enclosingIntRect(CCMathUtil::projectClippedRect(contentSpaceTransform.inverse(), FloatRect(shrunkRect)));
// The rect back in content space is a bounding box and may extend outside of the original contentRect, so clamp it to the contentRectBounds.
return intersection(unoccludedRect, contentRect);
}
template<typename LayerType, typename RenderSurfaceType>
IntRect CCOcclusionTrackerBase<LayerType, RenderSurfaceType>::unoccludedContentRect(const LayerType* layer, const IntRect& contentRect, bool* hasOcclusionFromOutsideTargetSurface) const
{
ASSERT(!m_stack.isEmpty());
if (m_stack.isEmpty())
return contentRect;
if (contentRect.isEmpty())
return contentRect;
ASSERT(layer->renderTarget() == m_stack.last().target);
// We want to return a rect that contains all the visible parts of |contentRect| in both screen space and in the target surface.
// So we find the visible parts of |contentRect| in each space, and take the intersection.
IntRect unoccludedInScreen = contentRect;
if (layerTransformsToScreenKnown(layer))
unoccludedInScreen = computeUnoccludedContentRect(contentRect, contentToScreenSpaceTransform<LayerType>(layer), m_scissorRectInScreenSpace, m_stack.last().occlusionInScreen);
IntRect unoccludedInTarget = contentRect;
if (layerTransformsToTargetKnown(layer))
unoccludedInTarget = computeUnoccludedContentRect(contentRect, contentToTargetSurfaceTransform<LayerType>(layer), layerScissorRectInTargetSurface(layer), m_stack.last().occlusionInTarget);
if (hasOcclusionFromOutsideTargetSurface)
*hasOcclusionFromOutsideTargetSurface = (intersection(unoccludedInScreen, unoccludedInTarget) != unoccludedInTarget);
return intersection(unoccludedInScreen, unoccludedInTarget);
}
template<typename LayerType, typename RenderSurfaceType>
IntRect CCOcclusionTrackerBase<LayerType, RenderSurfaceType>::unoccludedContributingSurfaceContentRect(const LayerType* layer, bool forReplica, const IntRect& contentRect, bool* hasOcclusionFromOutsideTargetSurface) const
{
ASSERT(!m_stack.isEmpty());
// The layer is a contributing renderTarget so it should have a surface.
ASSERT(layer->renderSurface());
// The layer is a contributing renderTarget so its target should be itself.
ASSERT(layer->renderTarget() == layer);
// The layer should not be the root, else what is is contributing to?
ASSERT(layer->parent());
// This should be called while the layer is still considered the current target in the occlusion tracker.
ASSERT(layer == m_stack.last().target);
if (contentRect.isEmpty())
return contentRect;
RenderSurfaceType* surface = layer->renderSurface();
IntRect surfaceClipRect = surface->clipRect();
if (surfaceClipRect.isEmpty()) {
LayerType* contributingSurfaceRenderTarget = layer->parent()->renderTarget();
surfaceClipRect = intersection(contributingSurfaceRenderTarget->renderSurface()->contentRect(), enclosingIntRect(surface->drawableContentRect()));
}
// A contributing surface doesn't get occluded by things inside its own surface, so only things outside the surface can occlude it. That occlusion is
// found just below the top of the stack (if it exists).
bool hasOcclusion = m_stack.size() > 1;
const WebTransformationMatrix& transformToScreen = forReplica ? surface->replicaScreenSpaceTransform() : surface->screenSpaceTransform();
const WebTransformationMatrix& transformToTarget = forReplica ? surface->replicaOriginTransform() : surface->originTransform();
IntRect unoccludedInScreen = contentRect;
if (surfaceTransformsToScreenKnown(surface)) {
if (hasOcclusion) {
const StackObject& secondLast = m_stack[m_stack.size() - 2];
unoccludedInScreen = computeUnoccludedContentRect(contentRect, transformToScreen, m_scissorRectInScreenSpace, secondLast.occlusionInScreen);
} else
unoccludedInScreen = computeUnoccludedContentRect(contentRect, transformToScreen, m_scissorRectInScreenSpace, Region());
}
IntRect unoccludedInTarget = contentRect;
if (surfaceTransformsToTargetKnown(surface)) {
if (hasOcclusion) {
const StackObject& secondLast = m_stack[m_stack.size() - 2];
unoccludedInTarget = computeUnoccludedContentRect(contentRect, transformToTarget, surfaceClipRect, secondLast.occlusionInTarget);
} else
unoccludedInTarget = computeUnoccludedContentRect(contentRect, transformToTarget, surfaceClipRect, Region());
}
if (hasOcclusionFromOutsideTargetSurface)
*hasOcclusionFromOutsideTargetSurface = (intersection(unoccludedInScreen, unoccludedInTarget) != unoccludedInTarget);
return intersection(unoccludedInScreen, unoccludedInTarget);
}
template<typename LayerType, typename RenderSurfaceType>
IntRect CCOcclusionTrackerBase<LayerType, RenderSurfaceType>::layerScissorRectInTargetSurface(const LayerType* layer) const
{
const LayerType* renderTarget = m_stack.last().target;
FloatRect totalScissor = renderTarget->renderSurface()->contentRect();
if (layer->usesLayerClipping())
totalScissor.intersect(layer->clipRect());
return enclosingIntRect(totalScissor);
}
// Declare the possible functions here for the linker.
template CCOcclusionTrackerBase<LayerChromium, RenderSurfaceChromium>::CCOcclusionTrackerBase(IntRect scissorRectInScreenSpace, bool recordMetricsForFrame);
template void CCOcclusionTrackerBase<LayerChromium, RenderSurfaceChromium>::enterLayer(const CCLayerIteratorPosition<LayerChromium>&);
template void CCOcclusionTrackerBase<LayerChromium, RenderSurfaceChromium>::leaveLayer(const CCLayerIteratorPosition<LayerChromium>&);
template void CCOcclusionTrackerBase<LayerChromium, RenderSurfaceChromium>::enterRenderTarget(const LayerChromium* newTarget);
template void CCOcclusionTrackerBase<LayerChromium, RenderSurfaceChromium>::finishedRenderTarget(const LayerChromium* finishedTarget);
template void CCOcclusionTrackerBase<LayerChromium, RenderSurfaceChromium>::leaveToRenderTarget(const LayerChromium* newTarget);
template void CCOcclusionTrackerBase<LayerChromium, RenderSurfaceChromium>::markOccludedBehindLayer(const LayerChromium*);
template bool CCOcclusionTrackerBase<LayerChromium, RenderSurfaceChromium>::occluded(const LayerChromium*, const IntRect& contentRect, bool* hasOcclusionFromOutsideTargetSurface) const;
template IntRect CCOcclusionTrackerBase<LayerChromium, RenderSurfaceChromium>::unoccludedContentRect(const LayerChromium*, const IntRect& contentRect, bool* hasOcclusionFromOutsideTargetSurface) const;
template IntRect CCOcclusionTrackerBase<LayerChromium, RenderSurfaceChromium>::unoccludedContributingSurfaceContentRect(const LayerChromium*, bool forReplica, const IntRect& contentRect, bool* hasOcclusionFromOutsideTargetSurface) const;
template IntRect CCOcclusionTrackerBase<LayerChromium, RenderSurfaceChromium>::layerScissorRectInTargetSurface(const LayerChromium*) const;
template CCOcclusionTrackerBase<CCLayerImpl, CCRenderSurface>::CCOcclusionTrackerBase(IntRect scissorRectInScreenSpace, bool recordMetricsForFrame);
template void CCOcclusionTrackerBase<CCLayerImpl, CCRenderSurface>::enterLayer(const CCLayerIteratorPosition<CCLayerImpl>&);
template void CCOcclusionTrackerBase<CCLayerImpl, CCRenderSurface>::leaveLayer(const CCLayerIteratorPosition<CCLayerImpl>&);
template void CCOcclusionTrackerBase<CCLayerImpl, CCRenderSurface>::enterRenderTarget(const CCLayerImpl* newTarget);
template void CCOcclusionTrackerBase<CCLayerImpl, CCRenderSurface>::finishedRenderTarget(const CCLayerImpl* finishedTarget);
template void CCOcclusionTrackerBase<CCLayerImpl, CCRenderSurface>::leaveToRenderTarget(const CCLayerImpl* newTarget);
template void CCOcclusionTrackerBase<CCLayerImpl, CCRenderSurface>::markOccludedBehindLayer(const CCLayerImpl*);
template bool CCOcclusionTrackerBase<CCLayerImpl, CCRenderSurface>::occluded(const CCLayerImpl*, const IntRect& contentRect, bool* hasOcclusionFromOutsideTargetSurface) const;
template IntRect CCOcclusionTrackerBase<CCLayerImpl, CCRenderSurface>::unoccludedContentRect(const CCLayerImpl*, const IntRect& contentRect, bool* hasOcclusionFromOutsideTargetSurface) const;
template IntRect CCOcclusionTrackerBase<CCLayerImpl, CCRenderSurface>::unoccludedContributingSurfaceContentRect(const CCLayerImpl*, bool forReplica, const IntRect& contentRect, bool* hasOcclusionFromOutsideTargetSurface) const;
template IntRect CCOcclusionTrackerBase<CCLayerImpl, CCRenderSurface>::layerScissorRectInTargetSurface(const CCLayerImpl*) const;
} // namespace WebCore
#endif // USE(ACCELERATED_COMPOSITING)
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