C++ LayoutBoxModelObject::hasLayer方法代码示例

void LineBoxListPainter::paint(const LayoutBoxModelObject& layoutObject, const PaintInfo& paintInfo, const LayoutPoint& paintOffset) const
{
    ASSERT(!shouldPaintSelfOutline(paintInfo.phase) && !shouldPaintDescendantOutlines(paintInfo.phase));

    // Only paint during the foreground/selection phases.
    if (paintInfo.phase != PaintPhaseForeground && paintInfo.phase != PaintPhaseSelection && paintInfo.phase != PaintPhaseTextClip && paintInfo.phase != PaintPhaseMask)
        return;

    ASSERT(layoutObject.isLayoutBlock() || (layoutObject.isLayoutInline() && layoutObject.hasLayer())); // The only way an inline could paint like this is if it has a layer.

    if (paintInfo.phase == PaintPhaseForeground && paintInfo.isPrinting())
        addPDFURLRectsForInlineChildrenRecursively(layoutObject, paintInfo, paintOffset);

    // If we have no lines then we have no work to do.
    if (!m_lineBoxList.firstLineBox())
        return;

    if (!m_lineBoxList.anyLineIntersectsRect(LineLayoutBoxModel(const_cast<LayoutBoxModelObject*>(&layoutObject)), paintInfo.cullRect(), paintOffset))
        return;

    PaintInfo info(paintInfo);

    // See if our root lines intersect with the dirty rect. If so, then we paint
    // them. Note that boxes can easily overlap, so we can't make any assumptions
    // based off positions of our first line box or our last line box.
    for (InlineFlowBox* curr = m_lineBoxList.firstLineBox(); curr; curr = curr->nextLineBox()) {
        if (m_lineBoxList.lineIntersectsDirtyRect(LineLayoutBoxModel(const_cast<LayoutBoxModelObject*>(&layoutObject)), curr, info.cullRect(), paintOffset)) {
            RootInlineBox& root = curr->root();
            curr->paint(info, paintOffset, root.lineTop(), root.lineBottom());
        }
    }
}

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.
}