void CCLayerTreeHostImpl::calculateRenderPasses(CCRenderPassList& passes, CCLayerList& renderSurfaceLayerList)
{
renderSurfaceLayerList.append(rootLayer());
if (!rootLayer()->renderSurface())
rootLayer()->createRenderSurface();
rootLayer()->renderSurface()->clearLayerList();
rootLayer()->renderSurface()->setContentRect(IntRect(IntPoint(), viewportSize()));
rootLayer()->setClipRect(IntRect(IntPoint(), viewportSize()));
{
TransformationMatrix identityMatrix;
TRACE_EVENT("CCLayerTreeHostImpl::calcDrawEtc", this, 0);
CCLayerTreeHostCommon::calculateDrawTransformsAndVisibility(rootLayer(), rootLayer(), identityMatrix, identityMatrix, renderSurfaceLayerList, rootLayer()->renderSurface()->layerList(), &m_layerSorter, layerRendererCapabilities().maxTextureSize);
}
if (layerRendererCapabilities().usingPartialSwap)
trackDamageForAllSurfaces(rootLayer(), renderSurfaceLayerList);
m_rootDamageRect = rootLayer()->renderSurface()->damageTracker()->currentDamageRect();
for (int surfaceIndex = renderSurfaceLayerList.size() - 1; surfaceIndex >= 0 ; --surfaceIndex) {
CCLayerImpl* renderSurfaceLayer = renderSurfaceLayerList[surfaceIndex];
CCRenderSurface* renderSurface = renderSurfaceLayer->renderSurface();
OwnPtr<CCRenderPass> pass = CCRenderPass::create(renderSurface);
FloatRect surfaceDamageRect;
if (layerRendererCapabilities().usingPartialSwap)
surfaceDamageRect = damageInSurfaceSpace(renderSurfaceLayer, m_rootDamageRect);
pass->setSurfaceDamageRect(surfaceDamageRect);
const CCLayerList& layerList = renderSurface->layerList();
for (unsigned layerIndex = 0; layerIndex < layerList.size(); ++layerIndex) {
CCLayerImpl* layer = layerList[layerIndex];
if (layer->visibleLayerRect().isEmpty())
continue;
if (CCLayerTreeHostCommon::renderSurfaceContributesToTarget(layer, renderSurfaceLayer->id())) {
pass->appendQuadsForRenderSurfaceLayer(layer);
continue;
}
layer->willDraw(m_layerRenderer.get());
pass->appendQuadsForLayer(layer);
}
passes.append(pass.release());
}
}
void CCDamageTracker::extendDamageForRenderSurface(CCLayerImpl* layer, FloatRect& targetDamageRect)
{
// There are two ways a "descendant surface" can damage regions of the "target surface":
// 1. Property change:
// - a surface's geometry can change because of
// - changes to descendants (i.e. the subtree) that affect the surface's content rect
// - changes to ancestor layers that propagate their property changes to their entire subtree.
// - just like layers, both the old surface rect and new surface rect will
// damage the target surface in this case.
//
// 2. Damage rect: This surface may have been damaged by its own layerList as well, and that damage
// should propagate to the target surface.
//
CCRenderSurface* renderSurface = layer->renderSurface();
bool surfaceIsNew = false;
FloatRect oldSurfaceRect = removeRectFromCurrentFrame(layer->id(), surfaceIsNew);
FloatRect surfaceRectInTargetSpace = renderSurface->drawableContentRect(); // already includes replica if it exists.
saveRectForNextFrame(layer->id(), surfaceRectInTargetSpace);
FloatRect damageRectInLocalSpace;
if (surfaceIsNew || renderSurface->surfacePropertyChanged() || layer->layerSurfacePropertyChanged()) {
// The entire surface contributes damage.
damageRectInLocalSpace = renderSurface->contentRect();
// The surface's old region is now exposed on the target surface, too.
targetDamageRect.uniteIfNonZero(oldSurfaceRect);
} else {
// Only the surface's damageRect will damage the target surface.
damageRectInLocalSpace = renderSurface->damageTracker()->currentDamageRect();
}
// If there was damage, transform it to target space, and possibly contribute its reflection if needed.
if (!damageRectInLocalSpace.isEmpty()) {
const WebTransformationMatrix& drawTransform = renderSurface->drawTransform();
FloatRect damageRectInTargetSpace = CCMathUtil::mapClippedRect(drawTransform, damageRectInLocalSpace);
targetDamageRect.uniteIfNonZero(damageRectInTargetSpace);
if (layer->replicaLayer()) {
const WebTransformationMatrix& replicaDrawTransform = renderSurface->replicaDrawTransform();
targetDamageRect.uniteIfNonZero(CCMathUtil::mapClippedRect(replicaDrawTransform, damageRectInLocalSpace));
}
}
// If there was damage on the replica's mask, then the target surface receives that damage as well.
if (layer->replicaLayer() && layer->replicaLayer()->maskLayer()) {
CCLayerImpl* replicaMaskLayer = layer->replicaLayer()->maskLayer();
bool replicaIsNew = false;
removeRectFromCurrentFrame(replicaMaskLayer->id(), replicaIsNew);
const WebTransformationMatrix& replicaDrawTransform = renderSurface->replicaDrawTransform();
FloatRect replicaMaskLayerRect = CCMathUtil::mapClippedRect(replicaDrawTransform, FloatRect(FloatPoint::zero(), FloatSize(replicaMaskLayer->bounds().width(), replicaMaskLayer->bounds().height())));
saveRectForNextFrame(replicaMaskLayer->id(), replicaMaskLayerRect);
// In the current implementation, a change in the replica mask damages the entire replica region.
if (replicaIsNew || replicaMaskLayer->layerPropertyChanged() || !replicaMaskLayer->updateRect().isEmpty())
targetDamageRect.uniteIfNonZero(replicaMaskLayerRect);
}
// If the layer has a background filter, this may cause pixels in our surface to be expanded, so we will need to expand any damage
// at or below this layer. We expand the damage from this layer too, as we need to readback those pixels from the surface with only
// the contents of layers below this one in them. This means we need to redraw any pixels in the surface being used for the blur in
// this layer this frame.
if (layer->backgroundFilters().hasFilterThatMovesPixels())
expandDamageRectInsideRectWithFilters(targetDamageRect, surfaceRectInTargetSpace, layer->backgroundFilters());
}
void CCDamageTracker::extendDamageForRenderSurface(CCLayerImpl* layer, FloatRect& targetDamageRect)
{
// There are two ways a "descendant surface" can damage regions of the "target surface":
// 1. Property change:
// - a surface's geometry can change because of
// - changes to descendants (i.e. the subtree) that affect the surface's content rect
// - changes to ancestor layers that propagate their property changes to their entire subtree.
// - just like layers, both the old surface rect and new surface rect will
// damage the target surface in this case.
//
// 2. Damage rect: This surface may have been damaged by its own layerList as well, and that damage
// should propagate to the target surface.
//
CCRenderSurface* renderSurface = layer->renderSurface();
bool surfaceIsNew = false;
FloatRect oldSurfaceRect = removeRectFromCurrentFrame(layer->id(), surfaceIsNew);
FloatRect surfaceRectInTargetSpace = renderSurface->drawableContentRect(); // already includes replica if it exists.
saveRectForNextFrame(layer->id(), surfaceRectInTargetSpace);
FloatRect damageRectInLocalSpace;
if (surfaceIsNew || renderSurface->surfacePropertyChanged()) {
// The entire surface contributes damage.
damageRectInLocalSpace = renderSurface->contentRect();
// The surface's old region is now exposed on the target surface, too.
targetDamageRect.uniteIfNonZero(oldSurfaceRect);
} else {
// Only the surface's damageRect will damage the target surface.
damageRectInLocalSpace = renderSurface->damageTracker()->currentDamageRect();
}
// If there was damage, transform it to target space, and possibly contribute its reflection if needed.
if (!damageRectInLocalSpace.isEmpty()) {
const TransformationMatrix& originTransform = renderSurface->originTransform();
FloatRect damageRectInTargetSpace = CCMathUtil::mapClippedRect(originTransform, damageRectInLocalSpace);
targetDamageRect.uniteIfNonZero(damageRectInTargetSpace);
if (layer->replicaLayer()) {
const TransformationMatrix& replicaOriginTransform = renderSurface->replicaOriginTransform();
targetDamageRect.uniteIfNonZero(CCMathUtil::mapClippedRect(replicaOriginTransform, damageRectInLocalSpace));
}
}
// If there was damage on the replica's mask, then the target surface receives that damage as well.
if (layer->replicaLayer() && layer->replicaLayer()->maskLayer()) {
CCLayerImpl* replicaMaskLayer = layer->replicaLayer()->maskLayer();
bool replicaIsNew = false;
removeRectFromCurrentFrame(replicaMaskLayer->id(), replicaIsNew);
// Compute the replica's "originTransform" that maps from the replica's origin space to the target surface origin space.
const TransformationMatrix& replicaOriginTransform = renderSurface->replicaOriginTransform();
FloatRect replicaMaskLayerRect = CCMathUtil::mapClippedRect(replicaOriginTransform, FloatRect(FloatPoint::zero(), FloatSize(replicaMaskLayer->bounds().width(), replicaMaskLayer->bounds().height())));
saveRectForNextFrame(replicaMaskLayer->id(), replicaMaskLayerRect);
// In the current implementation, a change in the replica mask damages the entire replica region.
if (replicaIsNew || replicaMaskLayer->layerPropertyChanged() || !replicaMaskLayer->updateRect().isEmpty())
targetDamageRect.uniteIfNonZero(replicaMaskLayerRect);
}
}
void CCLayerTreeHostImpl::trackDamageForAllSurfaces(CCLayerImpl* rootDrawLayer, const CCLayerList& renderSurfaceLayerList)
{
// For now, we use damage tracking to compute a global scissor. To do this, we must
// compute all damage tracking before drawing anything, so that we know the root
// damage rect. The root damage rect is then used to scissor each surface.
for (int surfaceIndex = renderSurfaceLayerList.size() - 1; surfaceIndex >= 0 ; --surfaceIndex) {
CCLayerImpl* renderSurfaceLayer = renderSurfaceLayerList[surfaceIndex];
CCRenderSurface* renderSurface = renderSurfaceLayer->renderSurface();
ASSERT(renderSurface);
renderSurface->damageTracker()->updateDamageTrackingState(renderSurface->layerList(), renderSurfaceLayer->id(), renderSurfaceLayer->maskLayer());
}
}
