Force bleed avoidance for some background image rendering

third_party/WebKit/Source/core/paint/BoxPainter.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 BoxPainter_h
 #define BoxPainter_h
 
 #include "core/layout/LayoutBoxModelObject.h"
 #include "core/paint/ObjectPainter.h"
 #include "wtf/Allocator.h"
@@ skipping 16 matching lines @@
     void paintBoxDecorationBackground(const PaintInfo&, const LayoutPoint&);
     void paintMask(const PaintInfo&, const LayoutPoint&);
     void paintClippingMask(const PaintInfo&, const LayoutPoint&);
 
     typedef Vector<const FillLayer*, 8> FillLayerOcclusionOutputList;
     // Returns true if the result fill layers have non-associative blending or compositing mode.
     // (i.e. The rendering will be different without creating isolation group by context.saveLayer().)
     // Note that the output list will be in top-bottom order.
     bool calculateFillLayerOcclusionCulling(FillLayerOcclusionOutputList &reversedPaintList, const FillLayer&);
 
+    // Returns true if the fill layer will certainly occlude anything painted behind it.
+    static bool isFillLayerOpaque(const FillLayer&, const LayoutObject&);
+
     void paintFillLayers(const PaintInfo&, const Color&, const FillLayer&, const LayoutRect&, BackgroundBleedAvoidance = BackgroundBleedNone, SkXfermode::Mode = SkXfermode::kSrcOver_Mode, const LayoutObject* backgroundObject = nullptr);
     void paintMaskImages(const PaintInfo&, const LayoutRect&);
     void paintBoxDecorationBackgroundWithRect(const PaintInfo&, const LayoutPoint&, const LayoutRect&);
     static void paintFillLayer(const LayoutBoxModelObject&, const PaintInfo&, const Color&, const FillLayer&, const LayoutRect&, BackgroundBleedAvoidance, const InlineFlowBox* = nullptr, const LayoutSize& = LayoutSize(), SkXfermode::Mode = SkXfermode::kSrcOver_Mode, const LayoutObject* backgroundObject = nullptr);
     static InterpolationQuality chooseInterpolationQuality(const LayoutObject&, Image*, const void*, const LayoutSize&);
     static bool paintNinePieceImage(const LayoutBoxModelObject&, GraphicsContext&, const LayoutRect&, const ComputedStyle&, const NinePieceImage&, SkXfermode::Mode = SkXfermode::kSrcOver_Mode);
     static void paintBorder(const LayoutBoxModelObject&, const PaintInfo&, const LayoutRect&, const ComputedStyle&, BackgroundBleedAvoidance = BackgroundBleedNone, bool includeLogicalLeftEdge = true, bool includeLogicalRightEdge = true);
     static void paintBoxShadow(const PaintInfo&, const LayoutRect&, const ComputedStyle&, ShadowStyle, bool includeLogicalLeftEdge = true, bool includeLogicalRightEdge = true);
     static bool shouldForceWhiteBackgroundForPrintEconomy(const ComputedStyle&, const Document&);
 
 private:
     void paintBackground(const PaintInfo&, const LayoutRect&, const Color& backgroundColor, BackgroundBleedAvoidance = BackgroundBleedNone);
     static FloatRoundedRect backgroundRoundedRectAdjustedForBleedAvoidance(const LayoutObject&, const LayoutRect&, BackgroundBleedAvoidance, const InlineFlowBox*, const LayoutSize&, bool includeLogicalLeftEdge, bool includeLogicalRightEdge);
     static FloatRoundedRect getBackgroundRoundedRect(const LayoutObject&, const LayoutRect&, const InlineFlowBox*, LayoutUnit inlineBoxWidth, LayoutUnit inlineBoxHeight,
         bool includeLogicalLeftEdge, bool includeLogicalRightEdge);
     static void applyBoxShadowForBackground(GraphicsContext&, const LayoutObject&);
 
     LayoutRect boundsForDrawingRecorder(const LayoutPoint& paintOffset);
 
     const LayoutBox& m_layoutBox;
 };
 
 } // namespace blink
 
 #endif