Use DrawingRecorder::canUseCachedDrawing

Source/core/rendering/RenderBlockFlow.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 2806 matching lines @@
     // Get the selection offsets for the bottom of the gap
     LayoutUnit logicalLeft = std::max(lastLogicalLeft, logicalLeftSelectionOffset(rootBlock, logicalBottom));
     LayoutUnit logicalRight = std::min(lastLogicalRight, logicalRightSelectionOffset(rootBlock, logicalBottom));
     LayoutUnit logicalWidth = logicalRight - logicalLeft;
     if (logicalWidth <= 0)
         return LayoutRect();
 
     LayoutRect gapRect = rootBlock->logicalRectToPhysicalRect(rootBlockPhysicalPosition, LayoutRect(logicalLeft, logicalTop, logicalWidth, logicalHeight));
     if (paintInfo) {
         IntRect selectionGapRect = alignSelectionRectToDevicePixels(gapRect);
-        RenderDrawingRecorder recorder(paintInfo->context, this, paintInfo->phase, selectionGapRect);
-        paintInfo->context->fillRect(selectionGapRect, selectionBackgroundColor());
+        RenderDrawingRecorder recorder(paintInfo->context, *this, paintInfo->phase, selectionGapRect);
+        if (!recorder.canUseCachedDrawing())
+            paintInfo->context->fillRect(selectionGapRect, selectionBackgroundColor());
     }
     return gapRect;
 }
 
 GapRects RenderBlockFlow::blockSelectionGaps(const RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
     LayoutUnit& lastLogicalTop, LayoutUnit& lastLogicalLeft, LayoutUnit& lastLogicalRight, const PaintInfo* paintInfo) const
 {
     GapRects result;
 
     // Go ahead and jump right to the first block child that contains some selected objects.
@@ skipping 61 matching lines @@
     LayoutUnit rootBlockLogicalTop = rootBlock->blockDirectionOffset(offsetFromRootBlock) + logicalTop;
     LayoutUnit rootBlockLogicalLeft = std::max(logicalLeftSelectionOffset(rootBlock, logicalTop), logicalLeftSelectionOffset(rootBlock, logicalTop + logicalHeight));
     LayoutUnit rootBlockLogicalRight = std::min(rootBlock->inlineDirectionOffset(offsetFromRootBlock) + logicalLeft, std::min(logicalRightSelectionOffset(rootBlock, logicalTop), logicalRightSelectionOffset(rootBlock, logicalTop + logicalHeight)));
     LayoutUnit rootBlockLogicalWidth = rootBlockLogicalRight - rootBlockLogicalLeft;
     if (rootBlockLogicalWidth <= 0)
         return LayoutRect();
 
     LayoutRect gapRect = rootBlock->logicalRectToPhysicalRect(rootBlockPhysicalPosition, LayoutRect(rootBlockLogicalLeft, rootBlockLogicalTop, rootBlockLogicalWidth, logicalHeight));
     if (paintInfo) {
         IntRect selectionGapRect = alignSelectionRectToDevicePixels(gapRect);
-        RenderDrawingRecorder recorder(paintInfo->context, this, paintInfo->phase, selectionGapRect);
-        paintInfo->context->fillRect(selectionGapRect, selObj->selectionBackgroundColor());
+        RenderDrawingRecorder recorder(paintInfo->context, *this, paintInfo->phase, selectionGapRect);
+        if (!recorder.canUseCachedDrawing())
+            paintInfo->context->fillRect(selectionGapRect, selObj->selectionBackgroundColor());
     }
     return gapRect;
 }
 
 LayoutRect RenderBlockFlow::logicalRightSelectionGap(const RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock,
     const RenderObject* selObj, LayoutUnit logicalRight, LayoutUnit logicalTop, LayoutUnit logicalHeight, const PaintInfo* paintInfo) const
 {
     LayoutUnit rootBlockLogicalTop = rootBlock->blockDirectionOffset(offsetFromRootBlock) + logicalTop;
     LayoutUnit rootBlockLogicalLeft = std::max(rootBlock->inlineDirectionOffset(offsetFromRootBlock) + logicalRight, max(logicalLeftSelectionOffset(rootBlock, logicalTop), logicalLeftSelectionOffset(rootBlock, logicalTop + logicalHeight)));
     LayoutUnit rootBlockLogicalRight = std::min(logicalRightSelectionOffset(rootBlock, logicalTop), logicalRightSelectionOffset(rootBlock, logicalTop + logicalHeight));
     LayoutUnit rootBlockLogicalWidth = rootBlockLogicalRight - rootBlockLogicalLeft;
     if (rootBlockLogicalWidth <= 0)
         return LayoutRect();
 
     LayoutRect gapRect = rootBlock->logicalRectToPhysicalRect(rootBlockPhysicalPosition, LayoutRect(rootBlockLogicalLeft, rootBlockLogicalTop, rootBlockLogicalWidth, logicalHeight));
     if (paintInfo) {
         IntRect selectionGapRect = alignSelectionRectToDevicePixels(gapRect);
-        RenderDrawingRecorder recorder(paintInfo->context, this, paintInfo->phase, selectionGapRect);
-        paintInfo->context->fillRect(selectionGapRect, selObj->selectionBackgroundColor());
+        RenderDrawingRecorder recorder(paintInfo->context, *this, paintInfo->phase, selectionGapRect);
+        if (!recorder.canUseCachedDrawing())
+            paintInfo->context->fillRect(selectionGapRect, selObj->selectionBackgroundColor());
     }
     return gapRect;
 }
 
 void RenderBlockFlow::getSelectionGapInfo(SelectionState state, bool& leftGap, bool& rightGap) const
 {
     bool ltr = style()->isLeftToRightDirection();
     leftGap = (state == RenderObject::SelectionInside)
         || (state == RenderObject::SelectionEnd && ltr)
         || (state == RenderObject::SelectionStart && !ltr);
@@ skipping 153 matching lines @@
     FrameView* frameView = document().view();
     LayoutUnit top = (style()->position() == FixedPosition) ? 0 : frameView->scrollOffset().height();
     int visibleHeight = frameView->visibleContentRect(IncludeScrollbars).height();
     if (size().height() < visibleHeight)
         top += (visibleHeight - size().height()) / 2;
     setY(top);
     dialog->setCentered(top);
 }
 
 } // namespace blink