void MultiColumnFragmentainerGroup::columnIntervalForBlockRangeInFlowThread(LayoutUnit logicalTopInFlowThread, LayoutUnit logicalBottomInFlowThread, unsigned& firstColumn, unsigned& lastColumn) const
{
ASSERT(logicalTopInFlowThread <= logicalBottomInFlowThread);
firstColumn = columnIndexAtOffset(logicalTopInFlowThread);
lastColumn = columnIndexAtOffset(logicalBottomInFlowThread);
// logicalBottomInFlowThread is an exclusive endpoint, so some additional adjustments may be necessary.
if (lastColumn > firstColumn && logicalTopInFlowThreadAt(lastColumn) == logicalBottomInFlowThread)
lastColumn--;
}
LayoutSize MultiColumnFragmentainerGroup::flowThreadTranslationAtOffset(LayoutUnit offsetInFlowThread) const
{
LayoutMultiColumnFlowThread* flowThread = m_columnSet.multiColumnFlowThread();
unsigned columnIndex = columnIndexAtOffset(offsetInFlowThread);
LayoutRect portionRect(flowThreadPortionRectAt(columnIndex));
flowThread->flipForWritingMode(portionRect);
LayoutRect columnRect(columnRectAt(columnIndex));
m_columnSet.flipForWritingMode(columnRect);
LayoutSize translationRelativeToGroup = columnRect.location() - portionRect.location();
LayoutSize enclosingTranslation;
if (LayoutMultiColumnFlowThread* enclosingFlowThread = flowThread->enclosingFlowThread()) {
// Translation that would map points in the coordinate space of the outermost flow thread to
// visual points in the first column in the first fragmentainer group (row) in our multicol
// container.
LayoutSize enclosingTranslationOrigin = enclosingFlowThread->flowThreadTranslationAtOffset(flowThread->blockOffsetInEnclosingFragmentationContext());
// Translation that would map points in the coordinate space of the outermost flow thread to
// visual points in the first column in this fragmentainer group.
enclosingTranslation = enclosingFlowThread->flowThreadTranslationAtOffset(blockOffsetInEnclosingFragmentationContext());
// What we ultimately return from this method is a translation that maps points in the
// coordinate space of our flow thread to a visual point in a certain column in this
// fragmentainer group. We had to go all the way up to the outermost flow thread, since this
// fragmentainer group may be in a different outer column than the first outer column that
// this multicol container lives in. It's the visual distance between the first
// fragmentainer group and this fragmentainer group that we need to add to the translation.
enclosingTranslation -= enclosingTranslationOrigin;
}
return enclosingTranslation + translationRelativeToGroup + offsetFromColumnSet() + m_columnSet.topLeftLocationOffset() - flowThread->topLeftLocationOffset();
}
LayoutSize RenderMultiColumnSet::flowThreadTranslationAtOffset(LayoutUnit blockOffset) const
{
unsigned columnIndex = columnIndexAtOffset(blockOffset);
LayoutRect portionRect(flowThreadPortionRectAt(columnIndex));
flipForWritingMode(portionRect);
LayoutRect columnRect(columnRectAt(columnIndex));
flipForWritingMode(columnRect);
return contentBoxRect().location() + columnRect.location() - portionRect.location();
}
LayoutSize MultiColumnFragmentainerGroup::flowThreadTranslationAtOffset(LayoutUnit offsetInFlowThread) const
{
LayoutFlowThread* flowThread = m_columnSet.flowThread();
unsigned columnIndex = columnIndexAtOffset(offsetInFlowThread);
LayoutRect portionRect(flowThreadPortionRectAt(columnIndex));
flowThread->flipForWritingMode(portionRect);
LayoutRect columnRect(columnRectAt(columnIndex));
m_columnSet.flipForWritingMode(columnRect);
LayoutSize translationRelativeToGroup = columnRect.location() - portionRect.location();
return translationRelativeToGroup + offsetFromColumnSet() + m_columnSet.topLeftLocationOffset() - flowThread->topLeftLocationOffset();
}
void MultiColumnFragmentainerGroup::columnIntervalForBlockRangeInFlowThread(
LayoutUnit logicalTopInFlowThread,
LayoutUnit logicalBottomInFlowThread,
unsigned& firstColumn,
unsigned& lastColumn) const {
logicalTopInFlowThread =
std::max(logicalTopInFlowThread, this->logicalTopInFlowThread());
logicalBottomInFlowThread =
std::min(logicalBottomInFlowThread, this->logicalBottomInFlowThread());
ASSERT(logicalTopInFlowThread <= logicalBottomInFlowThread);
firstColumn = columnIndexAtOffset(logicalTopInFlowThread,
LayoutBox::AssociateWithLatterPage);
if (logicalBottomInFlowThread == logicalTopInFlowThread) {
// Zero-height block range. There'll be one column in the interval. Set it
// right away. This is important if we're at a column boundary, since
// calling columnIndexAtOffset() with the end-exclusive bottom offset would
// actually give us the *previous* column.
lastColumn = firstColumn;
} else {
lastColumn = columnIndexAtOffset(logicalBottomInFlowThread,
LayoutBox::AssociateWithFormerPage);
}
}
void RenderMultiColumnSet::repaintFlowThreadContent(const LayoutRect& repaintRect, bool immediate) const
{
// Figure out the start and end columns and only check within that range so that we don't walk the
// entire column set. Put the repaint rect into flow thread coordinates by flipping it first.
LayoutRect flowThreadRepaintRect(repaintRect);
flowThread()->flipForWritingMode(flowThreadRepaintRect);
// Now we can compare this rect with the flow thread portions owned by each column. First let's
// just see if the repaint rect intersects our flow thread portion at all.
LayoutRect clippedRect(flowThreadRepaintRect);
clippedRect.intersect(RenderRegion::flowThreadPortionOverflowRect());
if (clippedRect.isEmpty())
return;
// Now we know we intersect at least one column. Let's figure out the logical top and logical
// bottom of the area we're repainting.
LayoutUnit repaintLogicalTop = isHorizontalWritingMode() ? flowThreadRepaintRect.y() : flowThreadRepaintRect.x();
LayoutUnit repaintLogicalBottom = (isHorizontalWritingMode() ? flowThreadRepaintRect.maxY() : flowThreadRepaintRect.maxX()) - 1;
unsigned startColumn = columnIndexAtOffset(repaintLogicalTop);
unsigned endColumn = columnIndexAtOffset(repaintLogicalBottom);
LayoutUnit colGap = columnGap();
unsigned colCount = columnCount();
for (unsigned i = startColumn; i <= endColumn; i++) {
LayoutRect colRect = columnRectAt(i);
// Get the portion of the flow thread that corresponds to this column.
LayoutRect flowThreadPortion = flowThreadPortionRectAt(i);
// Now get the overflow rect that corresponds to the column.
LayoutRect flowThreadOverflowPortion = flowThreadPortionOverflowRect(flowThreadPortion, i, colCount, colGap);
// Do a repaint for this specific column.
repaintFlowThreadContentRectangle(repaintRect, immediate, flowThreadPortion, flowThreadOverflowPortion, colRect.location());
}
}
void RenderMultiColumnSet::adjustRegionBoundsFromFlowThreadPortionRect(const LayoutPoint& layerOffset, LayoutRect& regionBounds)
{
LayoutUnit layerLogicalTop = isHorizontalWritingMode() ? layerOffset.y() : layerOffset.x();
unsigned startColumn = columnIndexAtOffset(layerLogicalTop);
LayoutUnit colGap = columnGap();
LayoutUnit colLogicalWidth = computedColumnWidth();
LayoutRect flowThreadPortion = flowThreadPortionRectAt(startColumn);
LayoutPoint translationOffset;
RenderBlockFlow* parentFlow = toRenderBlockFlow(parent());
bool progressionReversed = parentFlow->multiColumnFlowThread()->progressionIsReversed();
bool progressionIsInline = parentFlow->multiColumnFlowThread()->progressionIsInline();
LayoutUnit initialBlockOffset = initialBlockOffsetForPainting();
LayoutUnit inlineOffset = progressionIsInline ? startColumn * (colLogicalWidth + colGap) : LayoutUnit();
bool leftToRight = style().isLeftToRightDirection() ^ progressionReversed;
if (!leftToRight) {
inlineOffset = -inlineOffset;
if (progressionReversed)
inlineOffset += contentLogicalWidth() - colLogicalWidth;
}
translationOffset.setX(inlineOffset);
LayoutUnit blockOffset = initialBlockOffset + (isHorizontalWritingMode() ? -flowThreadPortion.y() : -flowThreadPortion.x());
if (!progressionIsInline) {
if (!progressionReversed)
blockOffset = startColumn * colGap;
else
blockOffset -= startColumn * (computedColumnHeight() + colGap);
}
if (isFlippedBlocksWritingMode(style().writingMode()))
blockOffset = -blockOffset;
translationOffset.setY(blockOffset);
if (!isHorizontalWritingMode())
translationOffset = translationOffset.transposedPoint();
// FIXME: The translation needs to include the multicolumn set's content offset within the
// multicolumn block as well. This won't be an issue until we start creating multiple multicolumn sets.
regionBounds.moveBy(roundedIntPoint(-translationOffset));
}
LayoutUnit RenderMultiColumnSet::pageLogicalTopForOffset(LayoutUnit offset) const
{
LayoutUnit portionLogicalTop = (isHorizontalWritingMode() ? flowThreadPortionRect().y() : flowThreadPortionRect().x());
unsigned columnIndex = columnIndexAtOffset(offset, AssumeNewColumns);
return portionLogicalTop + columnIndex * computedColumnHeight();
}
void RenderMultiColumnSet::collectLayerFragments(LayerFragments& fragments, const LayoutRect& layerBoundingBox, const LayoutRect& dirtyRect)
{
// The two rectangles passed to this method are physical, except that we pretend that there's
// only one long column (that's how a flow thread works).
//
// Then there's the output from this method - the stuff we put into the list of fragments. The
// fragment.paginationOffset point is the actual physical translation required to get from a
// location in the flow thread to a location in a given column. The fragment.paginationClip
// rectangle, on the other hand, is in the same coordinate system as the two rectangles passed
// to this method (flow thread coordinates).
//
// All other rectangles in this method are sized physically, and the inline direction coordinate
// is physical too, but the block direction coordinate is "logical top". This is the same as
// e.g. RenderBox::frameRect(). These rectangles also pretend that there's only one long column,
// i.e. they are for the flow thread.
// Put the layer bounds into flow thread-local coordinates by flipping it first. Since we're in
// a renderer, most rectangles are represented this way.
LayoutRect layerBoundsInFlowThread(layerBoundingBox);
flowThread()->flipForWritingMode(layerBoundsInFlowThread);
// Now we can compare with the flow thread portions owned by each column. First let's
// see if the rect intersects our flow thread portion at all.
LayoutRect clippedRect(layerBoundsInFlowThread);
clippedRect.intersect(RenderRegion::flowThreadPortionOverflowRect());
if (clippedRect.isEmpty())
return;
// Now we know we intersect at least one column. Let's figure out the logical top and logical
// bottom of the area we're checking.
LayoutUnit layerLogicalTop = isHorizontalWritingMode() ? layerBoundsInFlowThread.y() : layerBoundsInFlowThread.x();
LayoutUnit layerLogicalBottom = (isHorizontalWritingMode() ? layerBoundsInFlowThread.maxY() : layerBoundsInFlowThread.maxX()) - 1;
// Figure out the start and end columns and only check within that range so that we don't walk the
// entire column set.
unsigned startColumn = columnIndexAtOffset(layerLogicalTop);
unsigned endColumn = columnIndexAtOffset(layerLogicalBottom);
LayoutUnit colLogicalWidth = computedColumnWidth();
LayoutUnit colGap = columnGap();
unsigned colCount = columnCount();
for (unsigned i = startColumn; i <= endColumn; i++) {
// Get the portion of the flow thread that corresponds to this column.
LayoutRect flowThreadPortion = flowThreadPortionRectAt(i);
// Now get the overflow rect that corresponds to the column.
LayoutRect flowThreadOverflowPortion = flowThreadPortionOverflowRect(flowThreadPortion, i, colCount, colGap);
// In order to create a fragment we must intersect the portion painted by this column.
LayoutRect clippedRect(layerBoundsInFlowThread);
clippedRect.intersect(flowThreadOverflowPortion);
if (clippedRect.isEmpty())
continue;
// We also need to intersect the dirty rect. We have to apply a translation and shift based off
// our column index.
LayoutPoint translationOffset;
LayoutUnit inlineOffset = i * (colLogicalWidth + colGap);
if (!style()->isLeftToRightDirection())
inlineOffset = -inlineOffset;
translationOffset.setX(inlineOffset);
LayoutUnit blockOffset = isHorizontalWritingMode() ? -flowThreadPortion.y() : -flowThreadPortion.x();
if (isFlippedBlocksWritingMode(style()->writingMode()))
blockOffset = -blockOffset;
translationOffset.setY(blockOffset);
if (!isHorizontalWritingMode())
translationOffset = translationOffset.transposedPoint();
// FIXME: The translation needs to include the multicolumn set's content offset within the
// multicolumn block as well. This won't be an issue until we start creating multiple multicolumn sets.
// Shift the dirty rect to be in flow thread coordinates with this translation applied.
LayoutRect translatedDirtyRect(dirtyRect);
translatedDirtyRect.moveBy(-translationOffset);
// See if we intersect the dirty rect.
clippedRect = layerBoundingBox;
clippedRect.intersect(translatedDirtyRect);
if (clippedRect.isEmpty())
continue;
// Something does need to paint in this column. Make a fragment now and supply the physical translation
// offset and the clip rect for the column with that offset applied.
LayerFragment fragment;
fragment.paginationOffset = translationOffset;
LayoutRect flippedFlowThreadOverflowPortion(flowThreadOverflowPortion);
// Flip it into more a physical (RenderLayer-style) rectangle.
flowThread()->flipForWritingMode(flippedFlowThreadOverflowPortion);
fragment.paginationClip = flippedFlowThreadOverflowPortion;
fragments.append(fragment);
}
}
void MultiColumnFragmentainerGroup::collectLayerFragments(DeprecatedPaintLayerFragments& fragments, const LayoutRect& layerBoundingBox, const LayoutRect& dirtyRect) const
{
// |layerBoundingBox| is in the flow thread coordinate space, relative to the top/left edge of
// the flow thread, but note that it has been converted with respect to writing mode (so that
// it's visual/physical in that sense).
//
// |dirtyRect| is visual, relative to the multicol container.
//
// Then there's the output from this method - the stuff we put into the list of fragments. The
// fragment.paginationOffset point is the actual visual translation required to get from a
// location in the flow thread to a location in a given column. The fragment.paginationClip
// rectangle, on the other hand, is in flow thread coordinates, but otherwise completely
// physical in terms of writing mode.
//
// All other rectangles in this method are sized physically, and the inline direction coordinate
// is physical too, but the block direction coordinate is "logical top". This is the same as
// e.g. LayoutBox::frameRect(). These rectangles also pretend that there's only one long column,
// i.e. they are for the flow thread.
LayoutMultiColumnFlowThread* flowThread = m_columnSet.multiColumnFlowThread();
bool isHorizontalWritingMode = m_columnSet.isHorizontalWritingMode();
// Put the layer bounds into flow thread-local coordinates by flipping it first. Since we're in
// a layoutObject, most rectangles are represented this way.
LayoutRect layerBoundsInFlowThread(layerBoundingBox);
flowThread->flipForWritingMode(layerBoundsInFlowThread);
// Now we can compare with the flow thread portions owned by each column. First let's
// see if the rect intersects our flow thread portion at all.
LayoutRect clippedRect(layerBoundsInFlowThread);
clippedRect.intersect(m_columnSet.flowThreadPortionOverflowRect());
if (clippedRect.isEmpty())
return;
// Now we know we intersect at least one column. Let's figure out the logical top and logical
// bottom of the area we're checking.
LayoutUnit layerLogicalTop = isHorizontalWritingMode ? layerBoundsInFlowThread.y() : layerBoundsInFlowThread.x();
LayoutUnit layerLogicalBottom = (isHorizontalWritingMode ? layerBoundsInFlowThread.maxY() : layerBoundsInFlowThread.maxX()) - 1;
// Figure out the start and end columns and only check within that range so that we don't walk the
// entire column row.
unsigned startColumn = columnIndexAtOffset(layerLogicalTop);
unsigned endColumn = columnIndexAtOffset(layerLogicalBottom);
LayoutUnit colLogicalWidth = m_columnSet.pageLogicalWidth();
LayoutUnit colGap = m_columnSet.columnGap();
unsigned colCount = actualColumnCount();
bool progressionIsInline = flowThread->progressionIsInline();
bool leftToRight = m_columnSet.style()->isLeftToRightDirection();
LayoutUnit initialBlockOffset = m_columnSet.logicalTop() + logicalTop() - flowThread->logicalTop();
for (unsigned i = startColumn; i <= endColumn; i++) {
// Get the portion of the flow thread that corresponds to this column.
LayoutRect flowThreadPortion = flowThreadPortionRectAt(i);
// Now get the overflow rect that corresponds to the column.
LayoutRect flowThreadOverflowPortion = flowThreadPortionOverflowRect(flowThreadPortion, i, colCount, colGap);
// In order to create a fragment we must intersect the portion painted by this column.
LayoutRect clippedRect(layerBoundsInFlowThread);
clippedRect.intersect(flowThreadOverflowPortion);
if (clippedRect.isEmpty())
continue;
// We also need to intersect the dirty rect. We have to apply a translation and shift based off
// our column index.
LayoutPoint translationOffset;
LayoutUnit inlineOffset = progressionIsInline ? i * (colLogicalWidth + colGap) : LayoutUnit();
if (!leftToRight)
inlineOffset = -inlineOffset;
translationOffset.setX(inlineOffset);
LayoutUnit blockOffset;
if (progressionIsInline) {
blockOffset = initialBlockOffset + (isHorizontalWritingMode ? -flowThreadPortion.y() : -flowThreadPortion.x());
} else {
// Column gap can apply in the block direction for page fragmentainers.
// There is currently no spec which calls for column-gap to apply
// for page fragmentainers at all, but it's applied here for compatibility
// with the old multicolumn implementation.
blockOffset = i * colGap;
}
if (isFlippedBlocksWritingMode(m_columnSet.style()->writingMode()))
blockOffset = -blockOffset;
translationOffset.setY(blockOffset);
if (!isHorizontalWritingMode)
translationOffset = translationOffset.transposedPoint();
// Shift the dirty rect to be in flow thread coordinates with this translation applied.
LayoutRect translatedDirtyRect(dirtyRect);
translatedDirtyRect.moveBy(-translationOffset);
// See if we intersect the dirty rect.
clippedRect = layerBoundingBox;
clippedRect.intersect(translatedDirtyRect);
if (clippedRect.isEmpty())
continue;
// Something does need to paint in this column. Make a fragment now and supply the physical translation
// offset and the clip rect for the column with that offset applied.
DeprecatedPaintLayerFragment fragment;
fragment.paginationOffset = translationOffset;
LayoutRect flippedFlowThreadOverflowPortion(flowThreadOverflowPortion);
// Flip it into more a physical (DeprecatedPaintLayer-style) rectangle.
flowThread->flipForWritingMode(flippedFlowThreadOverflowPortion);
fragment.paginationClip = flippedFlowThreadOverflowPortion;
fragments.append(fragment);
}
}
LayoutUnit MultiColumnFragmentainerGroup::columnLogicalTopForOffset(LayoutUnit offsetInFlowThread) const
{
unsigned columnIndex = columnIndexAtOffset(offsetInFlowThread, AssumeNewColumns);
return logicalTopInFlowThreadAt(columnIndex);
}
void RenderMultiColumnSet::collectLayerFragments(LayerFragments& fragments, const LayoutRect& layerBoundingBox, const LayoutRect& dirtyRect)
{
// Let's start by introducing the different coordinate systems involved here. They are different
// in how they deal with writing modes and columns. RenderLayer rectangles tend to be more
// physical than the rectangles used in RenderObject & co.
//
// The two rectangles passed to this method are physical, except that we pretend that there's
// only one long column (that's the flow thread). They are relative to the top left corner of
// the flow thread. All rectangles being compared to the dirty rect also need to be in this
// coordinate system.
//
// Then there's the output from this method - the stuff we put into the list of fragments. The
// translationOffset point is the actual physical translation required to get from a location in
// the flow thread to a location in some column. The paginationClip rectangle is in the same
// coordinate system as the two rectangles passed to this method (i.e. physical, in flow thread
// coordinates, pretending that there's only one long column).
//
// All other rectangles in this method are slightly less physical, when it comes to how they are
// used with different writing modes, but they aren't really logical either. They are just like
// RenderBox::frameRect(). More precisely, the sizes are physical, and the inline direction
// coordinate is too, but the block direction coordinate is always "logical top". These
// rectangles also pretend that there's only one long column, i.e. they are for the flow thread.
//
// To sum up: input and output from this method are "physical" RenderLayer-style rectangles and
// points, while inside this method we mostly use the RenderObject-style rectangles (with the
// block direction coordinate always being logical top).
// Put the layer bounds into flow thread-local coordinates by flipping it first. Since we're in
// a renderer, most rectangles are represented this way.
LayoutRect layerBoundsInFlowThread(layerBoundingBox);
flowThread()->flipForWritingMode(layerBoundsInFlowThread);
// Now we can compare with the flow thread portions owned by each column. First let's
// see if the rect intersects our flow thread portion at all.
LayoutRect clippedRect(layerBoundsInFlowThread);
clippedRect.intersect(RenderRegion::flowThreadPortionOverflowRect());
if (clippedRect.isEmpty())
return;
// Now we know we intersect at least one column. Let's figure out the logical top and logical
// bottom of the area we're checking.
LayoutUnit layerLogicalTop = isHorizontalWritingMode() ? layerBoundsInFlowThread.y() : layerBoundsInFlowThread.x();
LayoutUnit layerLogicalBottom = (isHorizontalWritingMode() ? layerBoundsInFlowThread.maxY() : layerBoundsInFlowThread.maxX()) - 1;
// Figure out the start and end columns and only check within that range so that we don't walk the
// entire column set.
unsigned startColumn = columnIndexAtOffset(layerLogicalTop);
unsigned endColumn = columnIndexAtOffset(layerLogicalBottom);
LayoutUnit colLogicalWidth = computedColumnWidth();
LayoutUnit colGap = columnGap();
unsigned colCount = columnCount();
RenderBlockFlow* parentFlow = toRenderBlockFlow(parent());
bool progressionReversed = parentFlow->multiColumnFlowThread()->progressionIsReversed();
bool progressionIsInline = parentFlow->multiColumnFlowThread()->progressionIsInline();
LayoutUnit initialBlockOffset = initialBlockOffsetForPainting();
for (unsigned i = startColumn; i <= endColumn; i++) {
// Get the portion of the flow thread that corresponds to this column.
LayoutRect flowThreadPortion = flowThreadPortionRectAt(i);
// Now get the overflow rect that corresponds to the column.
LayoutRect flowThreadOverflowPortion = flowThreadPortionOverflowRect(flowThreadPortion, i, colCount, colGap);
// In order to create a fragment we must intersect the portion painted by this column.
LayoutRect clippedRect(layerBoundsInFlowThread);
clippedRect.intersect(flowThreadOverflowPortion);
if (clippedRect.isEmpty())
continue;
// We also need to intersect the dirty rect. We have to apply a translation and shift based off
// our column index.
LayoutPoint translationOffset;
LayoutUnit inlineOffset = progressionIsInline ? i * (colLogicalWidth + colGap) : LayoutUnit();
bool leftToRight = style().isLeftToRightDirection() ^ progressionReversed;
if (!leftToRight) {
inlineOffset = -inlineOffset;
if (progressionReversed)
inlineOffset += contentLogicalWidth() - colLogicalWidth;
}
translationOffset.setX(inlineOffset);
LayoutUnit blockOffset = initialBlockOffset + (isHorizontalWritingMode() ? -flowThreadPortion.y() : -flowThreadPortion.x());
if (!progressionIsInline) {
if (!progressionReversed)
blockOffset = i * colGap;
else
blockOffset -= i * (computedColumnHeight() + colGap);
}
if (isFlippedBlocksWritingMode(style().writingMode()))
blockOffset = -blockOffset;
translationOffset.setY(blockOffset);
if (!isHorizontalWritingMode())
translationOffset = translationOffset.transposedPoint();
// FIXME: The translation needs to include the multicolumn set's content offset within the
// multicolumn block as well. This won't be an issue until we start creating multiple multicolumn sets.
// Shift the dirty rect to be in flow thread coordinates with this translation applied.
LayoutRect translatedDirtyRect(dirtyRect);
translatedDirtyRect.moveBy(-translationOffset);
// See if we intersect the dirty rect.
clippedRect = layerBoundingBox;
clippedRect.intersect(translatedDirtyRect);
if (clippedRect.isEmpty())
continue;
// Something does need to paint in this column. Make a fragment now and supply the physical translation
// offset and the clip rect for the column with that offset applied.
LayerFragment fragment;
fragment.paginationOffset = translationOffset;
LayoutRect flippedFlowThreadOverflowPortion(flowThreadOverflowPortion);
// Flip it into more a physical (RenderLayer-style) rectangle.
flowThread()->flipForWritingMode(flippedFlowThreadOverflowPortion);
fragment.paginationClip = flippedFlowThreadOverflowPortion;
fragments.append(fragment);
}
}
void RenderMultiColumnSet::collectLayerFragments(Vector<LayerFragment>& fragments, const LayoutRect& layerBoundingBox, const LayoutRect& dirtyRect)
{
// Put the layer bounds into flow thread-local coordinates by flipping it first.
LayoutRect layerBoundsInFlowThread(layerBoundingBox);
flowThread()->flipForWritingMode(layerBoundsInFlowThread);
// Do the same for the dirty rect.
LayoutRect dirtyRectInFlowThread(dirtyRect);
flowThread()->flipForWritingMode(dirtyRectInFlowThread);
// Now we can compare with the flow thread portions owned by each column. First let's
// see if the rect intersects our flow thread portion at all.
LayoutRect clippedRect(layerBoundsInFlowThread);
clippedRect.intersect(RenderRegion::flowThreadPortionOverflowRect());
if (clippedRect.isEmpty())
return;
// Now we know we intersect at least one column. Let's figure out the logical top and logical
// bottom of the area we're checking.
LayoutUnit layerLogicalTop = isHorizontalWritingMode() ? layerBoundsInFlowThread.y() : layerBoundsInFlowThread.x();
LayoutUnit layerLogicalBottom = (isHorizontalWritingMode() ? layerBoundsInFlowThread.maxY() : layerBoundsInFlowThread.maxX()) - 1;
// Figure out the start and end columns and only check within that range so that we don't walk the
// entire column set.
unsigned startColumn = columnIndexAtOffset(layerLogicalTop);
unsigned endColumn = columnIndexAtOffset(layerLogicalBottom);
LayoutUnit colLogicalWidth = computedColumnWidth();
LayoutUnit colGap = columnGap();
unsigned colCount = columnCount();
for (unsigned i = startColumn; i <= endColumn; i++) {
// Get the portion of the flow thread that corresponds to this column.
LayoutRect flowThreadPortion = flowThreadPortionRectAt(i);
// Now get the overflow rect that corresponds to the column.
LayoutRect flowThreadOverflowPortion = flowThreadPortionOverflowRect(flowThreadPortion, i, colCount, colGap);
// In order to create a fragment we must intersect the portion painted by this column.
LayoutRect clippedRect(layerBoundsInFlowThread);
clippedRect.intersect(flowThreadOverflowPortion);
if (clippedRect.isEmpty())
continue;
// We also need to intersect the dirty rect. We have to apply a translation and shift based off
// our column index.
LayoutPoint translationOffset;
LayoutUnit inlineOffset = i * (colLogicalWidth + colGap);
if (!style()->isLeftToRightDirection())
inlineOffset = -inlineOffset;
translationOffset.setX(inlineOffset);
LayoutUnit blockOffset = isHorizontalWritingMode() ? -flowThreadPortion.y() : -flowThreadPortion.x();
if (isFlippedBlocksWritingMode(style()->writingMode()))
blockOffset = -blockOffset;
translationOffset.setY(blockOffset);
if (!isHorizontalWritingMode())
translationOffset = translationOffset.transposedPoint();
// FIXME: The translation needs to include the multicolumn set's content offset within the
// multicolumn block as well. This won't be an issue until we start creating multiple multicolumn sets.
// Shift the dirty rect to be in flow thread coordinates with this translation applied.
LayoutRect translatedDirtyRect(dirtyRectInFlowThread);
translatedDirtyRect.moveBy(-translationOffset);
// See if we intersect the dirty rect.
clippedRect = layerBoundsInFlowThread;
clippedRect.intersect(translatedDirtyRect);
if (clippedRect.isEmpty())
continue;
// Something does need to paint in this column. Make a fragment now and supply the physical translation
// offset and the clip rect for the column with that offset applied.
LayerFragment fragment;
fragment.paginationOffset = translationOffset;
LayoutRect flippedFlowThreadOverflowPortion(flowThreadOverflowPortion);
flipForWritingMode(flippedFlowThreadOverflowPortion);
fragment.paginationClip = flippedFlowThreadOverflowPortion;
fragments.append(fragment);
}
}
LayoutUnit RenderMultiColumnSet::pageLogicalTopForOffset(LayoutUnit offset) const
{
unsigned columnIndex = columnIndexAtOffset(offset, AssumeNewColumns);
return logicalTopInFlowThread() + columnIndex * pageLogicalHeight();
}
LayoutUnit MultiColumnFragmentainerGroup::columnLogicalTopForOffset(
LayoutUnit offsetInFlowThread) const {
unsigned columnIndex = columnIndexAtOffset(
offsetInFlowThread, LayoutBox::AssociateWithLatterPage);
return logicalTopInFlowThreadAt(columnIndex);
}
LayoutSize MultiColumnFragmentainerGroup::flowThreadTranslationAtOffset(
LayoutUnit offsetInFlowThread,
LayoutBox::PageBoundaryRule rule,
CoordinateSpaceConversion mode) const {
LayoutMultiColumnFlowThread* flowThread = m_columnSet.multiColumnFlowThread();
// A column out of range doesn't have a flow thread portion, so we need to
// clamp to make sure that we stay within the actual columns. This means that
// content in the overflow area will be mapped to the last actual column,
// instead of being mapped to an imaginary column further ahead.
unsigned columnIndex = offsetInFlowThread >= logicalBottomInFlowThread()
? actualColumnCount() - 1
: columnIndexAtOffset(offsetInFlowThread, rule);
LayoutRect portionRect(flowThreadPortionRectAt(columnIndex));
flowThread->flipForWritingMode(portionRect);
portionRect.moveBy(flowThread->topLeftLocation());
LayoutRect columnRect(columnRectAt(columnIndex));
columnRect.move(offsetFromColumnSet());
m_columnSet.flipForWritingMode(columnRect);
columnRect.moveBy(m_columnSet.topLeftLocation());
LayoutSize translationRelativeToFlowThread =
columnRect.location() - portionRect.location();
if (mode == CoordinateSpaceConversion::Containing)
return translationRelativeToFlowThread;
LayoutSize enclosingTranslation;
if (LayoutMultiColumnFlowThread* enclosingFlowThread =
flowThread->enclosingFlowThread()) {
const MultiColumnFragmentainerGroup& firstRow =
flowThread->firstMultiColumnSet()->firstFragmentainerGroup();
// Translation that would map points in the coordinate space of the
// outermost flow thread to visual points in the first column in the first
// fragmentainer group (row) in our multicol container.
LayoutSize enclosingTranslationOrigin =
enclosingFlowThread->flowThreadTranslationAtOffset(
firstRow.blockOffsetInEnclosingFragmentationContext(),
LayoutBox::AssociateWithLatterPage, mode);
// Translation that would map points in the coordinate space of the
// outermost flow thread to visual points in the first column in this
// fragmentainer group.
enclosingTranslation = enclosingFlowThread->flowThreadTranslationAtOffset(
blockOffsetInEnclosingFragmentationContext(),
LayoutBox::AssociateWithLatterPage, mode);
// What we ultimately return from this method is a translation that maps
// points in the coordinate space of our flow thread to a visual point in a
// certain column in this fragmentainer group. We had to go all the way up
// to the outermost flow thread, since this fragmentainer group may be in a
// different outer column than the first outer column that this multicol
// container lives in. It's the visual distance between the first
// fragmentainer group and this fragmentainer group that we need to add to
// the translation.
enclosingTranslation -= enclosingTranslationOrigin;
}
return enclosingTranslation + translationRelativeToFlowThread;
}
