static void applyClipRects(const ClipRectsContext& context, const LayoutObject& layoutObject, LayoutPoint offset, ClipRects& clipRects)
{
ASSERT(layoutObject.hasOverflowClip() || layoutObject.hasClip() || layoutObject.style()->containsPaint());
LayoutView* view = layoutObject.view();
ASSERT(view);
if (clipRects.fixed() && context.rootLayer->layoutObject() == view)
offset -= toIntSize(view->frameView()->scrollPosition());
if (layoutObject.hasOverflowClip() || layoutObject.style()->containsPaint()) {
ClipRect newOverflowClip = toLayoutBox(layoutObject).overflowClipRect(offset, context.scrollbarRelevancy);
newOverflowClip.setHasRadius(layoutObject.style()->hasBorderRadius());
clipRects.setOverflowClipRect(intersection(newOverflowClip, clipRects.overflowClipRect()));
if (layoutObject.isPositioned())
clipRects.setPosClipRect(intersection(newOverflowClip, clipRects.posClipRect()));
if (layoutObject.isLayoutView())
clipRects.setFixedClipRect(intersection(newOverflowClip, clipRects.fixedClipRect()));
if (layoutObject.style()->containsPaint()) {
clipRects.setPosClipRect(intersection(newOverflowClip, clipRects.posClipRect()));
clipRects.setFixedClipRect(intersection(newOverflowClip, clipRects.fixedClipRect()));
}
}
if (layoutObject.hasClip()) {
LayoutRect newClip = toLayoutBox(layoutObject).clipRect(offset);
clipRects.setPosClipRect(intersection(newClip, clipRects.posClipRect()).setIsClippedByClipCss());
clipRects.setOverflowClipRect(intersection(newClip, clipRects.overflowClipRect()).setIsClippedByClipCss());
clipRects.setFixedClipRect(intersection(newClip, clipRects.fixedClipRect()).setIsClippedByClipCss());
}
}
static void adjustClipRectsForChildren(const LayoutObject& layoutObject, ClipRects& clipRects)
{
EPosition position = layoutObject.style()->position();
// 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 (position == FixedPosition) {
clipRects.setPosClipRect(clipRects.fixedClipRect());
clipRects.setOverflowClipRect(clipRects.fixedClipRect());
clipRects.setFixed(true);
} else if (position == RelativePosition) {
clipRects.setPosClipRect(clipRects.overflowClipRect());
} else if (position == AbsolutePosition) {
clipRects.setOverflowClipRect(clipRects.posClipRect());
}
}
static void applyClipRects(const ClipRectsContext& context,
const LayoutBoxModelObject& layoutObject,
LayoutPoint offset,
ClipRects& clipRects) {
DCHECK(layoutObject.hasClipRelatedProperty() ||
(layoutObject.isSVGRoot() &&
toLayoutSVGRoot(&layoutObject)->shouldApplyViewportClip()));
LayoutView* view = layoutObject.view();
DCHECK(view);
if (clipRects.fixed() && context.rootLayer->layoutObject() == view)
offset -= LayoutSize(view->frameView()->scrollOffset());
if (layoutObject.hasOverflowClip() ||
(layoutObject.isSVGRoot() &&
toLayoutSVGRoot(&layoutObject)->shouldApplyViewportClip()) ||
(layoutObject.styleRef().containsPaint() && layoutObject.isBox())) {
ClipRect newOverflowClip =
toLayoutBox(layoutObject)
.overflowClipRect(offset, context.overlayScrollbarClipBehavior);
newOverflowClip.setHasRadius(layoutObject.styleRef().hasBorderRadius());
clipRects.setOverflowClipRect(
intersection(newOverflowClip, clipRects.overflowClipRect()));
if (layoutObject.isPositioned())
clipRects.setPosClipRect(
intersection(newOverflowClip, clipRects.posClipRect()));
if (layoutObject.isLayoutView())
clipRects.setFixedClipRect(
intersection(newOverflowClip, clipRects.fixedClipRect()));
if (layoutObject.styleRef().containsPaint()) {
clipRects.setPosClipRect(
intersection(newOverflowClip, clipRects.posClipRect()));
clipRects.setFixedClipRect(
intersection(newOverflowClip, clipRects.fixedClipRect()));
}
}
if (layoutObject.hasClip()) {
LayoutRect newClip = toLayoutBox(layoutObject).clipRect(offset);
clipRects.setPosClipRect(
intersection(newClip, clipRects.posClipRect()).setIsClippedByClipCss());
clipRects.setOverflowClipRect(
intersection(newClip, clipRects.overflowClipRect())
.setIsClippedByClipCss());
clipRects.setFixedClipRect(intersection(newClip, clipRects.fixedClipRect())
.setIsClippedByClipCss());
}
}
static ClipRect backgroundClipRectForPosition(const ClipRects& parentRects, EPosition position)
{
if (position == FixedPosition)
return parentRects.fixedClipRect();
if (position == AbsolutePosition)
return parentRects.posClipRect();
return parentRects.overflowClipRect();
}
static void applyClipRects(const ClipRectsContext& context, RenderObject& renderer, LayoutPoint offset, ClipRects& clipRects)
{
ASSERT(renderer.hasOverflowClip() || renderer.hasClip());
RenderView* view = renderer.view();
ASSERT(view);
if (clipRects.fixed() && context.rootLayer->renderer() == view)
offset -= view->frameView()->scrollOffsetForFixedPosition();
if (renderer.hasOverflowClip()) {
ClipRect newOverflowClip = toRenderBox(renderer).overflowClipRect(offset, context.scrollbarRelevancy);
newOverflowClip.setHasRadius(renderer.style()->hasBorderRadius());
clipRects.setOverflowClipRect(intersection(newOverflowClip, clipRects.overflowClipRect()));
if (renderer.isPositioned())
clipRects.setPosClipRect(intersection(newOverflowClip, clipRects.posClipRect()));
}
if (renderer.hasClip()) {
LayoutRect newClip = toRenderBox(renderer).clipRect(offset);
clipRects.setPosClipRect(intersection(newClip, clipRects.posClipRect()));
clipRects.setOverflowClipRect(intersection(newClip, clipRects.overflowClipRect()));
clipRects.setFixedClipRect(intersection(newClip, clipRects.fixedClipRect()));
}
}
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()));
}
}
}
