static void deriveBorderBoxFromContainerContext(const LayoutBoxModelObject& object, PaintPropertyTreeBuilderContext& context)
{
// TODO(trchen): There is some insanity going on with tables. Double check results.
switch (object.styleRef().position()) {
case StaticPosition:
break;
case RelativePosition:
context.paintOffset += object.offsetForInFlowPosition();
break;
case AbsolutePosition:
context.currentTransform = context.transformForOutOfFlowPositioned;
context.paintOffset = context.paintOffsetForOutOfFlowPositioned;
break;
case StickyPosition:
context.paintOffset += object.offsetForInFlowPosition();
break;
case FixedPosition:
context.currentTransform = context.transformForFixedPositioned;
context.paintOffset = context.paintOffsetForFixedPositioned;
break;
default:
ASSERT_NOT_REACHED();
}
if (object.isBox())
context.paintOffset += toLayoutBox(object).locationOffset();
}
PaintInvalidationState::PaintInvalidationState(PaintInvalidationState& next, LayoutBoxModelObject& layoutObject, const LayoutBoxModelObject& paintInvalidationContainer)
: m_clipped(false)
, m_cachedOffsetsEnabled(true)
, m_forcedSubtreeInvalidationWithinContainer(next.m_forcedSubtreeInvalidationWithinContainer)
, m_forcedSubtreeInvalidationRectUpdateWithinContainer(next.m_forcedSubtreeInvalidationRectUpdateWithinContainer)
, m_viewClippingAndScrollOffsetDisabled(false)
, m_paintInvalidationContainer(paintInvalidationContainer)
, m_pendingDelayedPaintInvalidations(next.pendingDelayedPaintInvalidationTargets())
, m_enclosingSelfPaintingLayer(next.enclosingSelfPaintingLayer(layoutObject))
{
// FIXME: SVG could probably benefit from a stack-based optimization like html does. crbug.com/391054
bool establishesPaintInvalidationContainer = layoutObject == m_paintInvalidationContainer;
bool fixed = layoutObject.style()->position() == FixedPosition;
if (!layoutObject.supportsPaintInvalidationStateCachedOffsets() || !next.m_cachedOffsetsEnabled)
m_cachedOffsetsEnabled = false;
if (establishesPaintInvalidationContainer) {
// When we hit a new paint invalidation container, we don't need to
// continue forcing a check for paint invalidation, since we're
// descending into a different invalidation container. (For instance if
// our parents were moved, the entire container will just move.)
m_forcedSubtreeInvalidationWithinContainer = false;
} else {
if (m_cachedOffsetsEnabled) {
if (fixed) {
FloatPoint fixedOffset = layoutObject.localToAncestorPoint(FloatPoint(), &m_paintInvalidationContainer, TraverseDocumentBoundaries);
m_paintOffset = LayoutSize(fixedOffset.x(), fixedOffset.y());
} else {
LayoutSize offset = layoutObject.isBox() && !layoutObject.isTableRow() ? toLayoutBox(layoutObject).locationOffset() : LayoutSize();
m_paintOffset = next.m_paintOffset + offset;
}
if (layoutObject.isOutOfFlowPositioned() && !fixed) {
if (LayoutObject* container = layoutObject.container()) {
if (container->style()->hasInFlowPosition() && container->isLayoutInline())
m_paintOffset += toLayoutInline(container)->offsetForInFlowPositionedInline(toLayoutBox(layoutObject));
}
}
if (layoutObject.style()->hasInFlowPosition() && layoutObject.hasLayer())
m_paintOffset += layoutObject.layer()->offsetForInFlowPosition();
}
m_clipped = !fixed && next.m_clipped;
if (m_clipped)
m_clipRect = next.m_clipRect;
}
if (m_cachedOffsetsEnabled && layoutObject.isSVGRoot()) {
const LayoutSVGRoot& svgRoot = toLayoutSVGRoot(layoutObject);
m_svgTransform = AffineTransform(svgRoot.localToBorderBoxTransform());
if (svgRoot.shouldApplyViewportClip())
addClipRectRelativeToPaintOffset(LayoutSize(svgRoot.pixelSnappedSize()));
}
applyClipIfNeeded(layoutObject);
// FIXME: <http://bugs.webkit.org/show_bug.cgi?id=13443> Apply control clip if present.
}
static PassRefPtr<EffectPaintPropertyNode> createEffectIfNeeded(const LayoutBoxModelObject& object, PaintPropertyTreeBuilderContext& context)
{
const ComputedStyle& style = object.styleRef();
if (!object.isBox() || !style.hasOpacity())
return nullptr;
RefPtr<EffectPaintPropertyNode> newEffectNode = EffectPaintPropertyNode::create(style.opacity(), context.currentEffect);
context.currentEffect = newEffectNode.get();
return newEffectNode.release();
}
static PassRefPtr<TransformPaintPropertyNode> createPerspectiveIfNeeded(const LayoutBoxModelObject& object, PaintPropertyTreeBuilderContext& context)
{
const ComputedStyle& style = object.styleRef();
if (!object.isBox() || !style.hasPerspective())
return nullptr;
RefPtr<TransformPaintPropertyNode> newTransformNodeForPerspective = TransformPaintPropertyNode::create(
TransformationMatrix().applyPerspective(style.perspective()),
perspectiveOrigin(toLayoutBox(object)) + toLayoutSize(context.paintOffset), context.currentTransform);
context.currentTransform = newTransformNodeForPerspective.get();
return newTransformNodeForPerspective.release();
}
static void updateOutOfFlowContext(const LayoutBoxModelObject& object, PaintPropertyTreeBuilderContext& context)
{
const ComputedStyle& style = object.styleRef();
bool hasTransform = object.isBox() && style.hasTransform();
if (style.position() != StaticPosition || hasTransform) {
context.transformForOutOfFlowPositioned = context.currentTransform;
context.paintOffsetForOutOfFlowPositioned = context.paintOffset;
}
if (hasTransform) {
context.transformForFixedPositioned = context.currentTransform;
context.paintOffsetForFixedPositioned = context.paintOffset;
}
}
static PassRefPtr<TransformPaintPropertyNode> createTransformIfNeeded(const LayoutBoxModelObject& object, PaintPropertyTreeBuilderContext& context)
{
const ComputedStyle& style = object.styleRef();
if (!object.isBox() || !style.hasTransform())
return nullptr;
ASSERT(context.paintOffset == LayoutPoint());
TransformationMatrix matrix;
style.applyTransform(matrix, toLayoutBox(object).size(), ComputedStyle::ExcludeTransformOrigin,
ComputedStyle::IncludeMotionPath, ComputedStyle::IncludeIndependentTransformProperties);
RefPtr<TransformPaintPropertyNode> newTransformNodeForTransform = TransformPaintPropertyNode::create(
matrix, transformOrigin(toLayoutBox(object)), context.currentTransform);
context.currentTransform = newTransformNodeForTransform.get();
return newTransformNodeForTransform.release();
}
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());
}
}
void PaintPropertyTreeBuilder::walk(LayoutBoxModelObject& object, const PaintPropertyTreeBuilderContext& context)
{
ASSERT(object.isBox() != object.isLayoutInline()); // Either or.
PaintPropertyTreeBuilderContext localContext(context);
deriveBorderBoxFromContainerContext(object, localContext);
RefPtr<TransformPaintPropertyNode> newTransformNodeForPaintOffsetTranslation = createPaintOffsetTranslationIfNeeded(object, localContext);
RefPtr<TransformPaintPropertyNode> newTransformNodeForTransform = createTransformIfNeeded(object, localContext);
RefPtr<EffectPaintPropertyNode> newEffectNode = createEffectIfNeeded(object, localContext);
RefPtr<TransformPaintPropertyNode> newTransformNodeForPerspective = createPerspectiveIfNeeded(object, localContext);
RefPtr<TransformPaintPropertyNode> newTransformNodeForScrollTranslation = createScrollTranslationIfNeeded(object, localContext);
updateOutOfFlowContext(object, localContext);
if (newTransformNodeForPaintOffsetTranslation || newTransformNodeForTransform || newEffectNode || newTransformNodeForPerspective || newTransformNodeForScrollTranslation) {
OwnPtr<ObjectPaintProperties> updatedPaintProperties = ObjectPaintProperties::create(
newTransformNodeForPaintOffsetTranslation.release(),
newTransformNodeForTransform.release(),
newEffectNode.release(),
newTransformNodeForPerspective.release(),
newTransformNodeForScrollTranslation.release());
object.setObjectPaintProperties(updatedPaintProperties.release());
} else {
object.clearObjectPaintProperties();
}
// TODO(trchen): Walk subframes for LayoutFrame.
// TODO(trchen): Implement SVG walk.
if (object.isSVGRoot()) {
return;
}
for (LayoutObject* child = object.slowFirstChild(); child; child = child->nextSibling()) {
if (child->isText())
continue;
walk(toLayoutBoxModelObject(*child), localContext);
}
}
