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27 #include "core/rendering/LayoutState.h"
29 #include "core/rendering/RenderInline.h"
30 #include "core/rendering/RenderLayer.h"
31 #include "core/rendering/RenderView.h"
32 #include "platform/Partitions.h"
36 LayoutState::LayoutState(LayoutState* prev, RenderBox& renderer, const LayoutSize& offset, LayoutUnit pageLogicalHeight, bool pageLogicalHeightChanged, ColumnInfo* columnInfo)
37 : m_columnInfo(columnInfo)
40 , m_renderer(&renderer)
45 bool fixed = renderer.isOutOfFlowPositioned() && renderer.style()->position() == FixedPosition;
47 // FIXME: This doesn't work correctly with transforms.
48 FloatPoint fixedOffset = renderer.view()->localToAbsolute(FloatPoint(), IsFixed);
49 m_paintOffset = LayoutSize(fixedOffset.x(), fixedOffset.y()) + offset;
51 m_paintOffset = prev->m_paintOffset + offset;
53 if (renderer.isOutOfFlowPositioned() && !fixed) {
54 if (RenderObject* container = renderer.container()) {
55 if (container->isInFlowPositioned() && container->isRenderInline())
56 m_paintOffset += toRenderInline(container)->offsetForInFlowPositionedInline(renderer);
60 m_layoutOffset = m_paintOffset;
62 if (renderer.isInFlowPositioned() && renderer.hasLayer())
63 m_paintOffset += renderer.layer()->offsetForInFlowPosition();
65 m_clipped = !fixed && prev->m_clipped;
67 m_clipRect = prev->m_clipRect;
69 if (renderer.hasOverflowClip()) {
70 LayoutSize deltaSize = RuntimeEnabledFeatures::repaintAfterLayoutEnabled() ? LayoutSize() : renderer.view()->layoutDelta();
72 LayoutRect clipRect(toPoint(m_paintOffset) + deltaSize, renderer.cachedSizeForOverflowClip());
74 m_clipRect.intersect(clipRect);
76 m_clipRect = clipRect;
80 m_paintOffset -= renderer.scrolledContentOffset();
83 // If we establish a new page height, then cache the offset to the top of the first page.
84 // We can compare this later on to figure out what part of the page we're actually on,
85 if (pageLogicalHeight || m_columnInfo || renderer.isRenderFlowThread()) {
86 m_pageLogicalHeight = pageLogicalHeight;
87 bool isFlipped = renderer.style()->isFlippedBlocksWritingMode();
88 m_pageOffset = LayoutSize(m_layoutOffset.width() + (!isFlipped ? renderer.borderLeft() + renderer.paddingLeft() : renderer.borderRight() + renderer.paddingRight()),
89 m_layoutOffset.height() + (!isFlipped ? renderer.borderTop() + renderer.paddingTop() : renderer.borderBottom() + renderer.paddingBottom()));
90 m_pageLogicalHeightChanged = pageLogicalHeightChanged;
93 // If we don't establish a new page height, then propagate the old page height and offset down.
94 m_pageLogicalHeight = m_next->m_pageLogicalHeight;
95 m_pageLogicalHeightChanged = m_next->m_pageLogicalHeightChanged;
96 m_pageOffset = m_next->m_pageOffset;
98 // Disable pagination for objects we don't support. For now this includes overflow:scroll/auto, inline blocks and
99 // writing mode roots.
100 if (renderer.isUnsplittableForPagination()) {
101 m_pageLogicalHeight = 0;
102 m_isPaginated = false;
104 m_isPaginated = m_pageLogicalHeight || m_next->m_columnInfo || renderer.flowThreadContainingBlock();
109 m_columnInfo = m_next->m_columnInfo;
111 if (!RuntimeEnabledFeatures::repaintAfterLayoutEnabled()) {
112 m_layoutDelta = m_next->m_layoutDelta;
114 m_layoutDeltaXSaturated = m_next->m_layoutDeltaXSaturated;
115 m_layoutDeltaYSaturated = m_next->m_layoutDeltaYSaturated;
119 // FIXME: <http://bugs.webkit.org/show_bug.cgi?id=13443> Apply control clip if present.
122 LayoutState::LayoutState(RenderObject& root)
124 , m_isPaginated(false)
125 , m_pageLogicalHeightChanged(false)
127 , m_layoutDeltaXSaturated(false)
128 , m_layoutDeltaYSaturated(false)
132 , m_pageLogicalHeight(0)
137 RenderObject* container = root.container();
138 FloatPoint absContentPoint = container->localToAbsolute(FloatPoint(), UseTransforms);
139 m_paintOffset = LayoutSize(absContentPoint.x(), absContentPoint.y());
141 if (container->hasOverflowClip()) {
143 RenderBox* containerBox = toRenderBox(container);
144 m_clipRect = LayoutRect(toPoint(m_paintOffset), containerBox->cachedSizeForOverflowClip());
145 m_paintOffset -= containerBox->scrolledContentOffset();
149 void* LayoutState::operator new(size_t sz)
151 return partitionAlloc(Partitions::getRenderingPartition(), sz);
154 void LayoutState::operator delete(void* ptr)
159 void LayoutState::clearPaginationInformation()
161 m_pageLogicalHeight = m_next->m_pageLogicalHeight;
162 m_pageOffset = m_next->m_pageOffset;
163 m_columnInfo = m_next->m_columnInfo;
166 LayoutUnit LayoutState::pageLogicalOffset(const RenderBox& child, const LayoutUnit& childLogicalOffset) const
168 if (child.isHorizontalWritingMode())
169 return m_layoutOffset.height() + childLogicalOffset - m_pageOffset.height();
170 return m_layoutOffset.width() + childLogicalOffset - m_pageOffset.width();
173 void LayoutState::addForcedColumnBreak(const RenderBox& child, const LayoutUnit& childLogicalOffset)
175 if (!m_columnInfo || m_columnInfo->columnHeight())
177 m_columnInfo->addForcedBreak(pageLogicalOffset(child, childLogicalOffset));
180 } // namespace WebCore