[New Multicolumn] Make rounded corners clipping multicol-aware.

Source/core/paint/LayerPainter.cpp

 // 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 "config.h"
 #include "core/paint/LayerPainter.h"
 
 #include "core/frame/Settings.h"
 #include "core/page/Page.h"
 #include "core/paint/FilterPainter.h"
@@ skipping 85 matching lines @@
         if (m_renderLayer.parent()) {
             ClipRectsContext clipRectsContext(paintingInfo.rootLayer, (paintFlags & PaintLayerUncachedClipRects) ? UncachedClipRects : PaintingClipRects, IgnoreOverlayScrollbarSize);
             if (shouldRespectOverflowClip(paintFlags, m_renderLayer.renderer()) == IgnoreOverflowClip)
                 clipRectsContext.setIgnoreOverflowClip();
             clipRect = m_renderLayer.clipper().backgroundClipRect(clipRectsContext);
             clipRect.intersect(paintingInfo.paintDirtyRect);
 
             if (needsToClip(paintingInfo, clipRect)) {
                 clipRecorder = adoptPtr(new ClipRecorder(m_renderLayer.parent(), context, DisplayItem::ClipLayerParent, clipRect));
                 if (clipRect.hasRadius())
-                    applyRoundedRectClips(*m_renderLayer.parent(), paintingInfo, context, paintFlags, *clipRecorder);
+                    applyRoundedRectClips(*m_renderLayer.parent(), paintingInfo, context, LayoutPoint(), paintFlags, *clipRecorder);
             }
         }
 
         paintLayerByApplyingTransform(context, paintingInfo, paintFlags);
 
         return;
     }
 
     paintLayerContentsAndReflection(context, paintingInfo, paintFlags);
 }
@@ skipping 251 matching lines @@
     }
 
     return false;
 }
 
 bool LayerPainter::needsToClip(const LayerPaintingInfo& localPaintingInfo, const ClipRect& clipRect)
 {
     return clipRect.rect() != localPaintingInfo.paintDirtyRect || clipRect.hasRadius();
 }
 
-void LayerPainter::applyRoundedRectClips(RenderLayer& renderLayer, const LayerPaintingInfo& localPaintingInfo, GraphicsContext* context,
-    PaintLayerFlags paintFlags, ClipRecorder& clipRecorder, BorderRadiusClippingRule rule)
+void LayerPainter::applyRoundedRectClips(RenderLayer& renderLayer, const LayerPaintingInfo& localPaintingInfo, GraphicsContext* context, const LayoutPoint& paginationOffset, PaintLayerFlags paintFlags, ClipRecorder& clipRecorder, BorderRadiusClippingRule rule)
 {
     // If the clip rect has been tainted by a border radius, then we have to walk up our layer chain applying the clips from
     // any layers with overflow. The condition for being able to apply these clips is that the overflow object be in our
     // containing block chain so we check that also.
     for (RenderLayer* layer = rule == IncludeSelfForBorderRadius ? &renderLayer : renderLayer.parent(); layer; layer = layer->parent()) {
         // Composited scrolling layers handle border-radius clip in the compositor via a mask layer. We do not
         // want to apply a border-radius clip to the layer contents itself, because that would require re-rastering
         // every frame to update the clip. We only want to make sure that the mask layer is properly clipped so
         // that it can in turn clip the scrolled contents in the compositor.
         if (layer->needsCompositedScrolling() && !(paintFlags & PaintLayerPaintingChildClippingMaskPhase))
             break;
 
         if (layer->renderer()->hasOverflowClip() && layer->renderer()->style()->hasBorderRadius() && inContainingBlockChain(&renderLayer, layer)) {
-            LayoutPoint delta;
+            LayoutPoint delta(paginationOffset);
             layer->convertToLayerCoords(localPaintingInfo.rootLayer, delta);
             clipRecorder.addRoundedRectClip(layer->renderer()->style()->getRoundedInnerBorderFor(LayoutRect(delta, layer->size())));
         }
 
         if (layer == localPaintingInfo.rootLayer)
             break;
     }
 }
 
 bool LayerPainter::atLeastOneFragmentIntersectsDamageRect(LayerFragments& fragments, const LayerPaintingInfo& localPaintingInfo, PaintLayerFlags localPaintFlags, const LayoutPoint& offsetFromRoot)
@@ skipping 94 matching lines @@
 void LayerPainter::paintOverflowControlsForFragments(const LayerFragments& layerFragments, GraphicsContext* context, const LayerPaintingInfo& localPaintingInfo, PaintLayerFlags paintFlags)
 {
     for (size_t i = 0; i < layerFragments.size(); ++i) {
         const LayerFragment& fragment = layerFragments.at(i);
 
         OwnPtr<ClipRecorder> clipRecorder;
 
         if (needsToClip(localPaintingInfo, fragment.backgroundRect)) {
             clipRecorder = adoptPtr(new ClipRecorder(&m_renderLayer, context, DisplayItem::ClipLayerOverflowControls, fragment.backgroundRect));
             if (fragment.backgroundRect.hasRadius())
-                applyRoundedRectClips(m_renderLayer, localPaintingInfo, context, paintFlags, *clipRecorder);
+                applyRoundedRectClips(m_renderLayer, localPaintingInfo, context, fragment.paginationOffset, paintFlags, *clipRecorder);
         }
         if (RenderLayerScrollableArea* scrollableArea = m_renderLayer.scrollableArea())
             scrollableArea->paintOverflowControls(context, roundedIntPoint(toPoint(fragment.layerBounds.location() - m_renderLayer.renderBoxLocation() + subPixelAccumulationIfNeeded(localPaintingInfo.subPixelAccumulation, m_renderLayer.compositingState()))), pixelSnappedIntRect(fragment.backgroundRect.rect()), true);
     }
 }
 
 static bool checkContainingBlockChainForPagination(RenderLayerModelObject* renderer, RenderBox* ancestorColumnsRenderer)
 {
     RenderView* view = renderer->view();
     RenderLayerModelObject* prevBlock = renderer;
@@ skipping 168 matching lines @@
             break;
         case PaintPhaseClippingMask:
             clipType = DisplayItem::ClipLayerFragmentClippingMask;
             break;
         default:
             ASSERT_NOT_REACHED();
         }
 
         clipRecorder = adoptPtr(new ClipRecorder(&m_renderLayer, context, clipType, clipRect));
         if (clipRect.hasRadius())
-            applyRoundedRectClips(m_renderLayer, paintingInfo, context, paintFlags, *clipRecorder, clippingRule);
+            applyRoundedRectClips(m_renderLayer, paintingInfo, context, fragment.paginationOffset, paintFlags, *clipRecorder, clippingRule);
     }
 
     PaintInfo paintInfo(context, pixelSnappedIntRect(clipRect.rect()), phase, paintBehavior, paintingRootForRenderer, 0, paintingInfo.rootLayer->renderer());
     m_renderLayer.renderer()->paint(paintInfo, toPoint(fragment.layerBounds.location() - m_renderLayer.renderBoxLocation() + subPixelAccumulationIfNeeded(paintingInfo.subPixelAccumulation, m_renderLayer.compositingState())));
 }
 
 void LayerPainter::paintBackgroundForFragments(const LayerFragments& layerFragments, GraphicsContext* context,
     const LayoutRect& transparencyPaintDirtyRect, bool haveTransparency, const LayerPaintingInfo& localPaintingInfo, PaintBehavior paintBehavior,
     RenderObject* paintingRootForRenderer, PaintLayerFlags paintFlags)
 {
@@ skipping 21 matching lines @@
         }
     }
 
     // Optimize clipping for the single fragment case.
     bool shouldClip = localPaintingInfo.clipToDirtyRect && layerFragments.size() == 1 && !layerFragments[0].foregroundRect.isEmpty();
     ClipState clipState = HasNotClipped;
     OwnPtr<ClipRecorder> clipRecorder;
     if (shouldClip && needsToClip(localPaintingInfo, layerFragments[0].foregroundRect)) {
         clipRecorder = adoptPtr(new ClipRecorder(&m_renderLayer, context, DisplayItem::ClipLayerForeground, layerFragments[0].foregroundRect));
         if (layerFragments[0].foregroundRect.hasRadius())
-            applyRoundedRectClips(m_renderLayer, localPaintingInfo, context, paintFlags, *clipRecorder);
+            applyRoundedRectClips(m_renderLayer, localPaintingInfo, context, layerFragments[0].paginationOffset, paintFlags, *clipRecorder);
         clipState = HasClipped;
     }
 
     // We have to loop through every fragment multiple times, since we have to issue paint invalidations in each specific phase in order for
     // interleaving of the fragments to work properly.
     paintForegroundForFragmentsWithPhase(selectionOnly ? PaintPhaseSelection : PaintPhaseChildBlockBackgrounds, layerFragments,
         context, localPaintingInfo, paintBehavior, paintingRootForRenderer, paintFlags, clipState);
 
     if (!selectionOnly) {
         paintForegroundForFragmentsWithPhase(PaintPhaseFloat, layerFragments, context, localPaintingInfo, paintBehavior, paintingRootForRenderer, paintFlags, clipState);
@@ skipping 75 matching lines @@
 
         OwnPtr<ClipRecorder> clipRecorder;
         if (needsToClip(paintingInfo, clipRect))
             clipRecorder = adoptPtr(new ClipRecorder(m_renderLayer.parent(), context, DisplayItem::ClipLayerFragmentParent, clipRect));
 
         paintLayerByApplyingTransform(context, paintingInfo, paintFlags, fragment.paginationOffset);
     }
 }
 
 } // namespace blink