void RenderLayerClipper::calculateClipRects(const ClipRectsContext& context, ClipRects& clipRects) const
{
if (!m_renderer.layer()->parent()) {
// The root layer's clip rect is always infinite.
clipRects.reset(PaintInfo::infiniteRect());
return;
}
bool isClippingRoot = m_renderer.layer() == context.rootLayer;
// For transformed layers, the root layer was shifted to be us, so there is no need to
// examine the parent. We want to cache clip rects with us as the root.
RenderLayer* parentLayer = !isClippingRoot ? m_renderer.layer()->parent() : 0;
// Ensure that our parent's clip has been calculated so that we can examine the values.
if (parentLayer) {
// FIXME: Why don't we just call getClipRects here?
if (context.usesCache() && parentLayer->clipper().cachedClipRects(context)) {
clipRects = *parentLayer->clipper().cachedClipRects(context);
} else {
parentLayer->clipper().calculateClipRects(context, clipRects);
}
} else {
clipRects.reset(PaintInfo::infiniteRect());
}
if (m_renderer.style()->position() == AbsolutePosition) {
clipRects.setOverflowClipRect(clipRects.posClipRect());
}
// This offset cannot use convertToLayerCoords, because sometimes our rootLayer may be across
// some transformed layer boundary, for example, in the RenderLayerCompositor overlapMap, where
// clipRects are needed in view space.
LayoutPoint offset = roundedLayoutPoint(m_renderer.localToContainerPoint(FloatPoint(), context.rootLayer->renderer()));
if (m_renderer.hasOverflowClip()) {
ClipRect newOverflowClip = m_renderer.overflowClipRect(offset);
newOverflowClip.setHasRadius(m_renderer.style()->hasBorderRadius());
clipRects.setOverflowClipRect(intersection(newOverflowClip, clipRects.overflowClipRect()));
if (m_renderer.isPositioned())
clipRects.setPosClipRect(intersection(newOverflowClip, clipRects.posClipRect()));
}
if (m_renderer.hasClip()) {
LayoutRect newClip = m_renderer.clipRect(offset);
clipRects.setPosClipRect(intersection(newClip, clipRects.posClipRect()));
clipRects.setOverflowClipRect(intersection(newClip, clipRects.overflowClipRect()));
}
}
void RenderLayerClipper::clearClipRectsIncludingDescendants()
{
m_cache = nullptr;
for (RenderLayer* layer = m_renderer.layer()->firstChild(); layer; layer = layer->nextSibling())
layer->clipper().clearClipRectsIncludingDescendants();
}
void RenderLayerClipper::clearClipRectsIncludingDescendants(ClipRectsCacheSlot cacheSlot)
{
if (m_cache)
m_cache->clear(cacheSlot);
for (RenderLayer* layer = m_renderer.layer()->firstChild(); layer; layer = layer->nextSibling())
layer->clipper().clearClipRectsIncludingDescendants(cacheSlot);
}
void RenderLayerClipper::updateClipRects(const ClipRectsContext& clipRectsContext)
{
ClipRectsType clipRectsType = clipRectsContext.clipRectsType;
ASSERT(clipRectsType < NumCachedClipRectsTypes);
if (m_clipRectsCache
&& clipRectsContext.rootLayer == m_clipRectsCache->clipRectsRoot(clipRectsType)
&& m_clipRectsCache->getClipRects(clipRectsType, clipRectsContext.respectOverflowClip)) {
// FIXME: We used to ASSERT that we always got a consistent root layer.
// We should add a test that has an inconsistent root. See
// http://crbug.com/366118 for an example.
ASSERT(m_clipRectsCache->m_scrollbarRelevancy[clipRectsType] == clipRectsContext.overlayScrollbarSizeRelevancy);
#ifdef CHECK_CACHED_CLIP_RECTS
// This code is useful to check cached clip rects, but is too expensive to leave enabled in debug builds by default.
ClipRectsContext tempContext(clipRectsContext);
tempContext.clipRectsType = TemporaryClipRects;
ClipRects clipRects;
calculateClipRects(tempContext, clipRects);
ASSERT(clipRects == *m_clipRectsCache->getClipRects(clipRectsType, clipRectsContext.respectOverflowClip).get());
#endif
return; // We have the correct cached value.
}
// For transformed layers, the root layer was shifted to be us, so there is no need to
// examine the parent. We want to cache clip rects with us as the root.
RenderLayer* parentLayer = !isClippingRootForContext(clipRectsContext) ? m_renderer.layer()->parent() : 0;
if (parentLayer)
parentLayer->clipper().updateClipRects(clipRectsContext);
ClipRects clipRects;
calculateClipRects(clipRectsContext, clipRects);
if (!m_clipRectsCache)
m_clipRectsCache = adoptPtr(new ClipRectsCache);
if (parentLayer && parentLayer->clipper().clipRects(clipRectsContext) && clipRects == *parentLayer->clipper().clipRects(clipRectsContext))
m_clipRectsCache->setClipRects(clipRectsType, clipRectsContext.respectOverflowClip, parentLayer->clipper().clipRects(clipRectsContext), clipRectsContext.rootLayer);
else
m_clipRectsCache->setClipRects(clipRectsType, clipRectsContext.respectOverflowClip, ClipRects::create(clipRects), clipRectsContext.rootLayer);
#ifndef NDEBUG
m_clipRectsCache->m_scrollbarRelevancy[clipRectsType] = clipRectsContext.overlayScrollbarSizeRelevancy;
#endif
}
void RenderLayerClipper::updateClipRects(const ClipRectsContext& clipRectsContext)
{
ClipRectsType clipRectsType = clipRectsContext.clipRectsType;
ASSERT(clipRectsType < NumCachedClipRectsTypes);
if (m_clipRectsCache && m_clipRectsCache->getClipRects(clipRectsType, clipRectsContext.respectOverflowClip)) {
// FIXME: these asserts trigger for squashing. Need to update this code to support squashing as appropriate.
ASSERT(clipRectsContext.rootLayer == m_clipRectsCache->m_clipRectsRoot[clipRectsType]);
ASSERT(m_clipRectsCache->m_scrollbarRelevancy[clipRectsType] == clipRectsContext.overlayScrollbarSizeRelevancy);
#ifdef CHECK_CACHED_CLIP_RECTS
// This code is useful to check cached clip rects, but is too expensive to leave enabled in debug builds by default.
ClipRectsContext tempContext(clipRectsContext);
tempContext.clipRectsType = TemporaryClipRects;
ClipRects clipRects;
calculateClipRects(tempContext, clipRects);
ASSERT(clipRects == *m_clipRectsCache->getClipRects(clipRectsType, clipRectsContext.respectOverflowClip).get());
#endif
return; // We have the correct cached value.
}
// For transformed layers, the root layer was shifted to be us, so there is no need to
// examine the parent. We want to cache clip rects with us as the root.
RenderLayer* parentLayer = clipRectsContext.rootLayer != m_renderer->layer() ? m_renderer->layer()->parent() : 0;
if (parentLayer)
parentLayer->clipper().updateClipRects(clipRectsContext);
ClipRects clipRects;
calculateClipRects(clipRectsContext, clipRects);
if (!m_clipRectsCache)
m_clipRectsCache = adoptPtr(new ClipRectsCache);
if (parentLayer && parentLayer->clipper().clipRects(clipRectsContext) && clipRects == *parentLayer->clipper().clipRects(clipRectsContext))
m_clipRectsCache->setClipRects(clipRectsType, clipRectsContext.respectOverflowClip, parentLayer->clipper().clipRects(clipRectsContext));
else
m_clipRectsCache->setClipRects(clipRectsType, clipRectsContext.respectOverflowClip, ClipRects::create(clipRects));
#ifndef NDEBUG
m_clipRectsCache->m_clipRectsRoot[clipRectsType] = clipRectsContext.rootLayer;
m_clipRectsCache->m_scrollbarRelevancy[clipRectsType] = clipRectsContext.overlayScrollbarSizeRelevancy;
#endif
}
void RenderLayerClipper::clearClipRectsIncludingDescendants(ClipRectsType typeToClear)
{
// FIXME: it's not clear how this layer not having clip rects guarantees that no descendants have any.
if (!m_clipRectsCache)
return;
clearClipRects(typeToClear);
for (RenderLayer* layer = m_renderer->layer()->firstChild(); layer; layer = layer->nextSibling())
layer->clipper().clearClipRectsIncludingDescendants(typeToClear);
}
void RenderLayerClipper::calculateClipRects(const ClipRectsContext& context, ClipRects& clipRects) const
{
if (!m_renderer.layer()->parent()) {
// The root layer's clip rect is always infinite.
clipRects.reset(PaintInfo::infiniteRect());
return;
}
bool isClippingRoot = m_renderer.layer() == context.rootLayer;
// For transformed layers, the root layer was shifted to be us, so there is no need to
// examine the parent. We want to cache clip rects with us as the root.
RenderLayer* parentLayer = !isClippingRoot ? m_renderer.layer()->parent() : 0;
// Ensure that our parent's clip has been calculated so that we can examine the values.
if (parentLayer) {
// FIXME: Why don't we just call getClipRects here?
if (context.usesCache() && parentLayer->clipper().cachedClipRects(context)) {
clipRects = *parentLayer->clipper().cachedClipRects(context);
} else {
parentLayer->clipper().calculateClipRects(context, clipRects);
}
} else {
clipRects.reset(PaintInfo::infiniteRect());
}
adjustClipRectsForChildren(m_renderer, clipRects);
// FIXME: This logic looks wrong. We'll apply overflow clip rects even if we were told to IgnoreOverflowClip if m_renderer.hasClip().
if ((m_renderer.hasOverflowClip() && (context.respectOverflowClip == RespectOverflowClip || !isClippingRoot)) || m_renderer.hasClip()) {
// This offset cannot use convertToLayerCoords, because sometimes our rootLayer may be across
// some transformed layer boundary, for example, in the RenderLayerCompositor overlapMap, where
// clipRects are needed in view space.
applyClipRects(context, m_renderer, roundedLayoutPoint(m_renderer.localToContainerPoint(FloatPoint(), context.rootLayer->renderer())), clipRects);
}
}
void RenderLayerClipper::calculateClipRects(const ClipRectsContext& clipRectsContext, ClipRects& clipRects) const
{
if (!m_renderer->layer()->parent()) {
// The root layer's clip rect is always infinite.
clipRects.reset(PaintInfo::infiniteRect());
return;
}
ClipRectsType clipRectsType = clipRectsContext.clipRectsType;
bool useCached = clipRectsType != TemporaryClipRects;
// For transformed layers, the root layer was shifted to be us, so there is no need to
// examine the parent. We want to cache clip rects with us as the root.
RenderLayer* parentLayer = clipRectsContext.rootLayer != m_renderer->layer() ? m_renderer->layer()->parent() : 0;
// Ensure that our parent's clip has been calculated so that we can examine the values.
if (parentLayer) {
if (useCached && parentLayer->clipper().clipRects(clipRectsContext)) {
clipRects = *parentLayer->clipper().clipRects(clipRectsContext);
} else {
ClipRectsContext parentContext(clipRectsContext);
parentContext.overlayScrollbarSizeRelevancy = IgnoreOverlayScrollbarSize; // FIXME: why?
parentLayer->clipper().calculateClipRects(parentContext, clipRects);
}
} else {
clipRects.reset(PaintInfo::infiniteRect());
}
// A fixed object is essentially the root of its containing block hierarchy, so when
// we encounter such an object, we reset our clip rects to the fixedClipRect.
if (m_renderer->style()->position() == FixedPosition) {
clipRects.setPosClipRect(clipRects.fixedClipRect());
clipRects.setOverflowClipRect(clipRects.fixedClipRect());
clipRects.setFixed(true);
} else if (m_renderer->style()->hasInFlowPosition()) {
clipRects.setPosClipRect(clipRects.overflowClipRect());
} else if (m_renderer->style()->position() == AbsolutePosition) {
clipRects.setOverflowClipRect(clipRects.posClipRect());
}
// Update the clip rects that will be passed to child layers.
if ((m_renderer->hasOverflowClip() && (clipRectsContext.respectOverflowClip == RespectOverflowClip || m_renderer->layer() != clipRectsContext.rootLayer)) || m_renderer->hasClip()) {
// This layer establishes a clip of some kind.
// This offset cannot use convertToLayerCoords, because sometimes our rootLayer may be across
// some transformed layer boundary, for example, in the RenderLayerCompositor overlapMap, where
// clipRects are needed in view space.
LayoutPoint offset;
offset = roundedLayoutPoint(m_renderer->localToContainerPoint(FloatPoint(), clipRectsContext.rootLayer->renderer()));
RenderView* view = m_renderer->view();
ASSERT(view);
if (view && clipRects.fixed() && clipRectsContext.rootLayer->renderer() == view) {
offset -= view->frameView()->scrollOffsetForFixedPosition();
}
if (m_renderer->hasOverflowClip()) {
ClipRect newOverflowClip = toRenderBox(m_renderer)->overflowClipRect(offset, clipRectsContext.region, clipRectsContext.overlayScrollbarSizeRelevancy);
if (m_renderer->style()->hasBorderRadius())
newOverflowClip.setHasRadius(true);
clipRects.setOverflowClipRect(intersection(newOverflowClip, clipRects.overflowClipRect()));
if (m_renderer->isPositioned())
clipRects.setPosClipRect(intersection(newOverflowClip, clipRects.posClipRect()));
}
if (m_renderer->hasClip()) {
LayoutRect newPosClip = toRenderBox(m_renderer)->clipRect(offset, clipRectsContext.region);
clipRects.setPosClipRect(intersection(newPosClip, clipRects.posClipRect()));
clipRects.setOverflowClipRect(intersection(newPosClip, clipRects.overflowClipRect()));
clipRects.setFixedClipRect(intersection(newPosClip, clipRects.fixedClipRect()));
}
}
}
