void RenderLayerClipper::getOrCalculateClipRects(const ClipRectsContext& context, ClipRects& clipRects) const
{
if (context.usesCache())
clipRects = *getClipRects(context);
else
calculateClipRects(context, clipRects);
}
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
}
ClipRects* PaintLayerClipper::getClipRects(const ClipRectsContext& context) const
{
if (ClipRects* result = clipRectsIfCached(context))
return result;
// Note that it's important that we call getClipRects on our parent
// before we call calculateClipRects so that calculateClipRects will hit
// the cache.
ClipRects* parentClipRects = 0;
if (context.rootLayer != m_layoutObject.layer() && m_layoutObject.layer()->parent())
parentClipRects = m_layoutObject.layer()->parent()->clipper().getClipRects(context);
RefPtr<ClipRects> clipRects = ClipRects::create();
calculateClipRects(context, *clipRects);
return storeClipRectsInCache(context, parentClipRects, *clipRects);
}
ClipRects* RenderLayerClipper::getClipRects(const ClipRectsContext& context) const
{
if (ClipRects* result = clipRectsIfCached(context))
return result;
// Note that it's important that we call getClipRects on our parent
// before we call calculateClipRects so that calculateClipRects will hit
// the cache.
ClipRects* parentClipRects = 0;
if (context.rootLayer != m_renderer.layer() && m_renderer.layer()->parent())
parentClipRects = m_renderer.layer()->parent()->clipper().getClipRects(context);
ClipRects clipRects;
calculateClipRects(context, clipRects);
return storeClipRectsInCache(context, parentClipRects, clipRects);
}
ClipRects* PaintLayerClipper::clipRectsIfCached(const ClipRectsContext& context) const
{
ASSERT(context.usesCache());
if (!m_cache)
return 0;
ClipRectsCache::Entry& entry = m_cache->get(context.cacheSlot());
// 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.
if (context.rootLayer != entry.root)
return 0;
ASSERT(entry.scrollbarRelevancy == context.scrollbarRelevancy);
#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(context);
tempContext.cacheSlot = UncachedClipRects;
RefPtr<ClipRects> clipRects = ClipRects::create();
calculateClipRects(tempContext, *clipRects);
ASSERT(clipRects == *entry.clipRects);
#endif
return entry.clipRects.get();
}