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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "core/layout/PaintInvalidationState.h"
#include "core/layout/LayoutInline.h"
#include "core/layout/LayoutView.h"
#include "core/layout/svg/LayoutSVGModelObject.h"
#include "core/layout/svg/LayoutSVGRoot.h"
#include "core/paint/PaintLayer.h"
namespace blink {
PaintInvalidationState::PaintInvalidationState(const LayoutView& layoutView, Vector<LayoutObject*>& pendingDelayedPaintInvalidations, const PaintInvalidationState* ownerPaintInvalidationState)
: m_currentObject(layoutView)
, m_clipped(false)
, m_cachedOffsetsEnabled(true)
, m_forcedSubtreeInvalidationWithinContainer(false)
, m_forcedSubtreeInvalidationRectUpdateWithinContainer(false)
, m_viewClippingAndScrollOffsetDisabled(false)
, m_paintInvalidationContainer(layoutView.containerForPaintInvalidation())
, m_pendingDelayedPaintInvalidations(pendingDelayedPaintInvalidations)
, m_enclosingSelfPaintingLayer(*layoutView.layer())
#if ENABLE(ASSERT)
, m_didUpdatePaintOffsetAndClipForChildren(true)
#endif
{
ASSERT(!ownerPaintInvalidationState || ownerPaintInvalidationState->m_didUpdatePaintOffsetAndClipForChildren);
bool establishesPaintInvalidationContainer = layoutView == m_paintInvalidationContainer;
if (!establishesPaintInvalidationContainer) {
if ((ownerPaintInvalidationState && !ownerPaintInvalidationState->m_cachedOffsetsEnabled)
|| !layoutView.supportsPaintInvalidationStateCachedOffsets()) {
m_cachedOffsetsEnabled = false;
return;
}
if (ownerPaintInvalidationState && ownerPaintInvalidationState->m_forcedSubtreeInvalidationWithinContainer)
m_forcedSubtreeInvalidationWithinContainer = true;
FloatPoint point = layoutView.localToAncestorPoint(FloatPoint(), &m_paintInvalidationContainer, TraverseDocumentBoundaries);
m_paintOffset = LayoutSize(point.x(), point.y());
}
m_clipRect = layoutView.viewRect();
m_clipRect.move(m_paintOffset);
m_clipped = true;
}
// TODO(wangxianzhu): This is temporary for positioned object whose paintInvalidationContainer is different from
// the one we find during tree walk. Remove this after we fix the issue with tree walk in DOM-order.
PaintInvalidationState::PaintInvalidationState(const PaintInvalidationState& parentState, const LayoutBoxModelObject& currentObject, const LayoutBoxModelObject& paintInvalidationContainer)
: m_currentObject(currentObject)
, m_clipped(parentState.m_clipped)
, m_cachedOffsetsEnabled(parentState.m_cachedOffsetsEnabled)
, m_forcedSubtreeInvalidationWithinContainer(parentState.m_forcedSubtreeInvalidationWithinContainer)
, m_forcedSubtreeInvalidationRectUpdateWithinContainer(parentState.m_forcedSubtreeInvalidationRectUpdateWithinContainer)
, m_viewClippingAndScrollOffsetDisabled(false)
, m_clipRect(parentState.m_clipRect)
, m_paintOffset(parentState.m_paintOffset)
, m_paintInvalidationContainer(paintInvalidationContainer)
, m_svgTransform(parentState.m_svgTransform)
, m_pendingDelayedPaintInvalidations(parentState.pendingDelayedPaintInvalidationTargets())
, m_enclosingSelfPaintingLayer(parentState.enclosingSelfPaintingLayer(currentObject))
#if ENABLE(ASSERT)
, m_didUpdatePaintOffsetAndClipForChildren(true)
#endif
{
ASSERT(parentState.m_didUpdatePaintOffsetAndClipForChildren);
ASSERT(!m_cachedOffsetsEnabled);
}
PaintInvalidationState::PaintInvalidationState(const PaintInvalidationState& parentState, const LayoutObject& currentObject)
: m_currentObject(currentObject)
, m_clipped(parentState.m_clipped)
, m_cachedOffsetsEnabled(parentState.m_cachedOffsetsEnabled)
, m_forcedSubtreeInvalidationWithinContainer(parentState.m_forcedSubtreeInvalidationWithinContainer)
, m_forcedSubtreeInvalidationRectUpdateWithinContainer(parentState.m_forcedSubtreeInvalidationRectUpdateWithinContainer)
, m_viewClippingAndScrollOffsetDisabled(false)
, m_clipRect(parentState.m_clipRect)
, m_paintOffset(parentState.m_paintOffset)
, m_paintInvalidationContainer(currentObject.isPaintInvalidationContainer() ? toLayoutBoxModelObject(currentObject) : parentState.m_paintInvalidationContainer)
, m_svgTransform(parentState.m_svgTransform)
, m_pendingDelayedPaintInvalidations(parentState.pendingDelayedPaintInvalidationTargets())
, m_enclosingSelfPaintingLayer(parentState.enclosingSelfPaintingLayer(currentObject))
#if ENABLE(ASSERT)
, m_didUpdatePaintOffsetAndClipForChildren(false)
#endif
{
ASSERT(parentState.m_didUpdatePaintOffsetAndClipForChildren);
}
void PaintInvalidationState::updatePaintOffsetAndClipForChildren()
{
#if ENABLE(ASSERT)
ASSERT(!m_didUpdatePaintOffsetAndClipForChildren);
m_didUpdatePaintOffsetAndClipForChildren = true;
#endif
bool establishesPaintInvalidationContainer = m_currentObject == m_paintInvalidationContainer;
if (!m_currentObject.isBoxModelObject()) {
// TODO(wangxianzhu): SVG could probably benefit from a stack-based optimization like html does. crbug.com/391054.
ASSERT(m_currentObject.isSVG());
ASSERT(!establishesPaintInvalidationContainer);
if (m_cachedOffsetsEnabled)
m_svgTransform = AffineTransform(m_svgTransform * m_currentObject.localToSVGParentTransform());
return;
}
bool fixed = m_currentObject.style()->position() == FixedPosition;
if (!m_currentObject.supportsPaintInvalidationStateCachedOffsets())
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;
m_forcedSubtreeInvalidationRectUpdateWithinContainer = false;
m_clipped = false; // Will be updated in applyClipIfNeeded().
m_paintOffset = LayoutSize();
} else {
if (m_cachedOffsetsEnabled) {
if (fixed) {
FloatPoint fixedOffset = m_currentObject.localToAncestorPoint(FloatPoint(), &m_paintInvalidationContainer, TraverseDocumentBoundaries);
m_paintOffset = LayoutSize(fixedOffset.x(), fixedOffset.y());
} else if (m_currentObject.isBox() && !m_currentObject.isTableRow()) {
// We don't add locationOffset of table row because the child cells' location offsets include the row's location offset.
m_paintOffset += toLayoutBox(m_currentObject).locationOffset();
}
if (m_currentObject.isOutOfFlowPositioned() && !fixed) {
if (LayoutObject* container = m_currentObject.container()) {
if (container->isInFlowPositioned() && container->isLayoutInline())
m_paintOffset += toLayoutInline(container)->offsetForInFlowPositionedInline(toLayoutBox(m_currentObject));
}
}
if (m_currentObject.isInFlowPositioned() && m_currentObject.hasLayer())
m_paintOffset += toLayoutBoxModelObject(m_currentObject).layer()->offsetForInFlowPosition();
}
m_clipped = !fixed && m_clipped;
}
if (m_cachedOffsetsEnabled && m_currentObject.isSVGRoot()) {
const LayoutSVGRoot& svgRoot = toLayoutSVGRoot(m_currentObject);
m_svgTransform = AffineTransform(svgRoot.localToBorderBoxTransform());
if (svgRoot.shouldApplyViewportClip())
addClipRectRelativeToPaintOffset(LayoutSize(svgRoot.pixelSnappedSize()));
}
applyClipIfNeeded();
// FIXME: <http://bugs.webkit.org/show_bug.cgi?id=13443> Apply control clip if present.
}
bool PaintInvalidationState::mapObjectRectToAncestor(const LayoutObject& object, const LayoutBoxModelObject* ancestor, LayoutRect& rect, VisibleRectFlags visibleRectFlags) const
{
ASSERT(canMapToAncestor(ancestor));
if (ancestor == &object) {
if (object.isBox() && object.styleRef().isFlippedBlocksWritingMode())
toLayoutBox(object).flipForWritingMode(rect);
return true;
}
if (object.hasLayer()) {
if (const TransformationMatrix* transform = toLayoutBoxModelObject(object).layer()->transform())
rect = LayoutRect(transform->mapRect(pixelSnappedIntRect(rect)));
if (object.isInFlowPositioned())
rect.move(toLayoutBoxModelObject(object).layer()->offsetForInFlowPosition());
}
if (object.isBox())
rect.moveBy(toLayoutBox(object).location());
rect.move(m_paintOffset);
if (m_clipped) {
if (visibleRectFlags & EdgeInclusive)
return rect.inclusiveIntersect(m_clipRect);
rect.intersect(m_clipRect);
}
return !rect.isEmpty();
}
void PaintInvalidationState::addClipRectRelativeToPaintOffset(const LayoutSize& clipSize)
{
LayoutRect clipRect(toPoint(m_paintOffset), clipSize);
if (m_clipped) {
m_clipRect.intersect(clipRect);
} else {
m_clipRect = clipRect;
m_clipped = true;
}
}
void PaintInvalidationState::applyClipIfNeeded()
{
if (!m_currentObject.hasOverflowClip())
return;
const LayoutBox& box = toLayoutBox(m_currentObject);
// Do not clip scroll layer contents because the compositor expects the whole layer
// to be always invalidated in-time.
if (box.usesCompositedScrolling())
ASSERT(!m_clipped); // The box should establish paint invalidation container, so no m_clipped inherited.
else
addClipRectRelativeToPaintOffset(LayoutSize(box.layer()->size()));
m_paintOffset -= box.scrolledContentOffset();
}
PaintLayer& PaintInvalidationState::enclosingSelfPaintingLayer(const LayoutObject& layoutObject) const
{
if (layoutObject.hasLayer() && toLayoutBoxModelObject(layoutObject).hasSelfPaintingLayer())
return *toLayoutBoxModelObject(layoutObject).layer();
return m_enclosingSelfPaintingLayer;
}
} // namespace blink
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