void RenderMultiColumnSet::paintColumnContents(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
    // For each rectangle, set it as the region rectangle and then let flow thread painting do the rest.
    // We make multiple calls to paintFlowThreadPortionInRegion, changing the rectangles each time.
    unsigned colCount = columnCount();
    if (!colCount)
        return;

    LayoutUnit colGap = columnGap();
    for (unsigned i = 0; i < colCount; i++) {
        // First we get the column rect, which is in our local coordinate space, and we make it physical and apply
        // the paint offset to it. That gives us the physical location that we want to paint the column at.
        LayoutRect colRect = columnRectAt(i);
        flipForWritingMode(colRect);
        colRect.moveBy(paintOffset);
        
        // Next we 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 the paint with the computed rects.
        flowThread()->paintFlowThreadPortionInRegion(paintInfo, this, flowThreadPortion, flowThreadOverflowPortion, colRect.location());
    }
}
bool RenderMultiColumnSet::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction action)
{
    LayoutPoint adjustedLocation = accumulatedOffset + location();

    // Check our bounds next. For this purpose always assume that we can only be hit in the
    // foreground phase (which is true for replaced elements like images).
    // FIXME: Once we support overflow, we need to intersect with that and not with the bounds rect.
    LayoutRect boundsRect = borderBoxRectInRegion(locationInContainer.region());
    boundsRect.moveBy(adjustedLocation);
    if (!visibleToHitTesting() || action != HitTestForeground || !locationInContainer.intersects(boundsRect))
        return false;
    
    // The point is in one specific column. Since columns can't overlap, we don't ever have to test
    // multiple columns. Put the 
    
    // FIXME: It would be nice to jump right to the specific column by just doing math on the point. Since columns
    // can't overlap, we shouldn't have to walk every column like this. The old column code walked all the columns, though,
    // so this is no worse. We'd have to watch out for rect-based hit testing, though, which actually could overlap
    // multiple columns.
    LayoutUnit colGap = columnGap();
    unsigned colCount = columnCount();
    for (unsigned i = 0; i < colCount; i++) {
        // First we get the column rect, which is in our local coordinate space, and we make it physical and apply
        // the hit test offset to it. That gives us the physical location that we want to paint the column at.
        LayoutRect colRect = columnRectAt(i);
        flipForWritingMode(colRect);
        colRect.moveBy(adjustedLocation);
        
        // Next we 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 the hit test with the computed rects.
        if (flowThread()->hitTestFlowThreadPortionInRegion(this, flowThreadPortion, flowThreadOverflowPortion, request, result, locationInContainer, colRect.location()))
            return true;
    }
    
    updateHitTestResult(result, locationInContainer.point() - toLayoutSize(adjustedLocation));
    return !result.addNodeToRectBasedTestResult(node(), request, locationInContainer, boundsRect);
}
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());
    }
}
// Hit Testing
bool RenderRegion::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction action)
{
    if (!isValid())
        return false;

    LayoutPoint adjustedLocation = accumulatedOffset + location();

    // Check our bounds next. For this purpose always assume that we can only be hit in the
    // foreground phase (which is true for replaced elements like images).
    // FIXME: Once we support overflow, we need to intersect with that and not with the bounds rect.
    LayoutRect boundsRect = borderBoxRectInRegion(locationInContainer.region());
    boundsRect.moveBy(adjustedLocation);
    if (visibleToHitTestRequest(request) && action == HitTestForeground && locationInContainer.intersects(boundsRect)) {
        // Check the contents of the RenderFlowThread.
        if (m_flowThread->hitTestFlowThreadPortionInRegion(this, flowThreadPortionRect(), flowThreadPortionOverflowRect(), request, result, locationInContainer, LayoutPoint(adjustedLocation.x() + borderLeft() + paddingLeft(), adjustedLocation.y() + borderTop() + paddingTop())))
            return true;
        updateHitTestResult(result, locationInContainer.point() - toLayoutSize(adjustedLocation));
        if (!result.addNodeToRectBasedTestResult(generatingNode(), request, locationInContainer, boundsRect))
            return true;
    }

    return false;
}
void RenderRegion::repaintFlowThreadContent(const LayoutRect& repaintRect) const
{
    repaintFlowThreadContentRectangle(repaintRect, flowThreadPortionRect(), flowThreadPortionOverflowRect(), contentBoxRect().location());
}
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 RenderRegion::paintObject(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
    if (style()->visibility() != VISIBLE)
        return;

    RenderBlock::paintObject(paintInfo, paintOffset);

    // Delegate painting of content in region to RenderFlowThread.
    // RenderFlowThread is a self painting layer (being a positioned object) who is painting its children, the collected objects.
    // Since we do not want to paint the flow thread content multiple times (for each painting phase of the region object),
    // we allow the flow thread painting only for the selection and the foreground phase.
    if (!isValid() || (paintInfo.phase != PaintPhaseForeground && paintInfo.phase != PaintPhaseSelection))
        return;

    setRegionObjectsRegionStyle();
    m_flowThread->paintFlowThreadPortionInRegion(paintInfo, this, flowThreadPortionRect(), flowThreadPortionOverflowRect(), LayoutPoint(paintOffset.x() + borderLeft() + paddingLeft(), paintOffset.y() + borderTop() + paddingTop()));
    restoreRegionObjectsOriginalStyle();
}
// Hit Testing
bool RenderRegion::hitTestFlowThreadContents(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction action)
{
    if (!isValid() || action != HitTestForeground)
        return false;

    LayoutRect boundsRect = borderBoxRectInRegion(locationInContainer.region());
    boundsRect.moveBy(accumulatedOffset);
    if (visibleToHitTesting() && locationInContainer.intersects(boundsRect)) {
        if (m_flowThread->hitTestFlowThreadPortionInRegion(this, flowThreadPortionRect(), flowThreadPortionOverflowRect(), request, result,
            locationInContainer, LayoutPoint(accumulatedOffset.x() + borderLeft() + paddingLeft(), accumulatedOffset.y() + borderTop() + paddingTop())))
            return true;
    }

    return false;
}
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);
    }
}
Exemple #10
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void RenderRegion::paintObject(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
    if (style()->visibility() != VISIBLE)
        return;

    RenderBlock::paintObject(paintInfo, paintOffset);

    if (!isValid())
        return;

    // We do not want to paint a region's contents multiple times (for each paint phase of the region object).
    // Thus, we only paint the region's contents in certain phases.
    if (!shouldPaintRegionContentsInPhase(paintInfo.phase))
        return;

    // Delegate the painting of a region's contents to RenderFlowThread.
    // RenderFlowThread is a self painting layer because it's a positioned object.
    // RenderFlowThread paints its children, the collected objects.
    setRegionObjectsRegionStyle();
    m_flowThread->paintFlowThreadPortionInRegion(paintInfo, this, flowThreadPortionRect(), flowThreadPortionOverflowRect(), LayoutPoint(paintOffset.x() + borderLeft() + paddingLeft(), paintOffset.y() + borderTop() + paddingTop()));
    restoreRegionObjectsOriginalStyle();
}
Exemple #11
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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);
    }
}
Exemple #12
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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);
    }
}