Calculate and track display item opaqueness

third_party/WebKit/Source/core/paint/LayoutObjectDrawingRecorder.h

 // 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.
 
 #ifndef LayoutObjectDrawingRecorder_h
 #define LayoutObjectDrawingRecorder_h
 
 #include "core/layout/LayoutObject.h"
 #include "core/paint/PaintPhase.h"
 #include "platform/geometry/LayoutPoint.h"
@@ skipping 39 matching lines @@
 
     LayoutObjectDrawingRecorder(GraphicsContext& context, const LayoutObject& layoutObject, PaintPhase phase, const FloatRect& clip, const LayoutPoint& paintOffset)
         : LayoutObjectDrawingRecorder(context, layoutObject, DisplayItem::paintPhaseToDrawingType(phase), clip, paintOffset) { }
 
     LayoutObjectDrawingRecorder(GraphicsContext& context, const LayoutObject& layoutObject, PaintPhase phase, const LayoutRect& clip, const LayoutPoint& paintOffset)
         : LayoutObjectDrawingRecorder(context, layoutObject, DisplayItem::paintPhaseToDrawingType(phase), FloatRect(clip), paintOffset) { }
 
     LayoutObjectDrawingRecorder(GraphicsContext& context, const LayoutObject& layoutObject, PaintPhase phase, const IntRect& clip, const LayoutPoint& paintOffset)
         : LayoutObjectDrawingRecorder(context, layoutObject, DisplayItem::paintPhaseToDrawingType(phase), FloatRect(clip), paintOffset) { }
 
+    void setKnownToBeOpaque() { ASSERT(RuntimeEnabledFeatures::slimmingPaintV2Enabled()); m_drawingRecorder->setKnownToBeOpaque(); }
+
 #if ENABLE(ASSERT)
     void setUnderInvalidationCheckingMode(DrawingDisplayItem::UnderInvalidationCheckingMode mode) { m_drawingRecorder->setUnderInvalidationCheckingMode(mode); }
 #endif
 
 private:
     static void updatePaintOffsetIfNeeded(PaintController& paintController, const LayoutObject& layoutObject, const LayoutPoint& paintOffset)
     {
         if (!RuntimeEnabledFeatures::slimmingPaintOffsetCachingEnabled() || paintController.skippingCache())
             return;
 
         if (layoutObject.paintOffsetChanged(paintOffset))
             paintController.invalidatePaintOffset(layoutObject);
         else
             ASSERT(!paintController.paintOffsetWasInvalidated(layoutObject) || !paintController.clientCacheIsValid(layoutObject));
 
         layoutObject.mutableForPainting().setPreviousPaintOffset(paintOffset);
     }
 
     Optional<DisplayItemCacheSkipper> m_cacheSkipper;
     Optional<DrawingRecorder> m_drawingRecorder;
 };
 
 } // namespace blink
 
 #endif // LayoutObjectDrawingRecorder_h