Use DrawingRecorder::canUseCachedDrawing

Source/core/paint/BlockPainter.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/BlockPainter.h"
 
 #include "core/editing/Caret.h"
 #include "core/editing/FrameSelection.h"
 #include "core/frame/LocalFrame.h"
@@ skipping 159 matching lines @@
     }
 
     if ((paintPhase == PaintPhaseBlockBackground || paintPhase == PaintPhaseChildBlockBackground) && m_renderBlock.style()->visibility() == VISIBLE) {
         if (m_renderBlock.hasBoxDecorationBackground())
             m_renderBlock.paintBoxDecorationBackground(paintInfo, paintOffset);
         if (m_renderBlock.hasColumns() && !paintInfo.paintRootBackgroundOnly())
             paintColumnRules(paintInfo, scrolledOffset);
     }
 
     if (paintPhase == PaintPhaseMask && m_renderBlock.style()->visibility() == VISIBLE) {
-        RenderDrawingRecorder recorder(paintInfo.context, &m_renderBlock, paintPhase, bounds);
-        m_renderBlock.paintMask(paintInfo, paintOffset);
+        RenderDrawingRecorder recorder(paintInfo.context, m_renderBlock, paintPhase, bounds);
+        if (!recorder.canUseCachedDrawing())
+            m_renderBlock.paintMask(paintInfo, paintOffset);
         return;
     }
 
     if (paintPhase == PaintPhaseClippingMask && m_renderBlock.style()->visibility() == VISIBLE) {
-        RenderDrawingRecorder recorder(paintInfo.context, &m_renderBlock, paintPhase, bounds);
-        m_renderBlock.paintClippingMask(paintInfo, paintOffset);
+        RenderDrawingRecorder recorder(paintInfo.context, m_renderBlock, paintPhase, bounds);
+        if (!recorder.canUseCachedDrawing())
+            m_renderBlock.paintClippingMask(paintInfo, paintOffset);
         return;
     }
 
     // We're done. We don't bother painting any children.
     if (paintPhase == PaintPhaseBlockBackground || paintInfo.paintRootBackgroundOnly())
         return;
 
     if (paintPhase != PaintPhaseSelfOutline) {
         if (m_renderBlock.hasColumns())
             paintColumnContents(paintInfo, scrolledOffset);
@@ skipping 19 matching lines @@
         if (!m_renderBlock.style()->outlineStyleIsAuto() || !m_renderBlock.isAnonymousBlockContinuation())
             ObjectPainter(m_renderBlock).paintOutline(paintInfo, LayoutRect(paintOffset, m_renderBlock.size()));
     }
 
     if (paintPhase == PaintPhaseOutline || paintPhase == PaintPhaseChildOutlines)
         paintContinuationOutlines(paintInfo, paintOffset);
 
     // If the caret's node's render object's containing block is this block, and the paint action is PaintPhaseForeground,
     // then paint the caret.
     if (paintPhase == PaintPhaseForeground) {
-        RenderDrawingRecorder recorder(paintInfo.context, &m_renderBlock, paintPhase, bounds);
-        paintCarets(paintInfo, paintOffset);
+        RenderDrawingRecorder recorder(paintInfo.context, m_renderBlock, paintPhase, bounds);
+        if (!recorder.canUseCachedDrawing())
+            paintCarets(paintInfo, paintOffset);
     }
 }
 
 static inline bool caretBrowsingEnabled(const Frame* frame)
 {
     Settings* settings = frame->settings();
     return settings && settings->caretBrowsingEnabled();
 }
 
 static inline bool hasCursorCaret(const FrameSelection& selection, const RenderBlock* block, bool caretBrowsing)
@@ skipping 245 matching lines @@
         RenderBlock* block = flow->containingBlock();
         for ( ; block && block != &m_renderBlock; block = block->containingBlock())
             accumulatedPaintOffset.moveBy(block->location());
         ASSERT(block);
         InlinePainter(*flow).paintOutline(info, accumulatedPaintOffset);
     }
 }
 
 
 } // namespace blink