handle antialiased rendering as premultiplied

core/fxge/skia/fx_skia_device.h

 // Copyright 2014 PDFium 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 CORE_FXGE_SKIA_FX_SKIA_DEVICE_H_
 #define CORE_FXGE_SKIA_FX_SKIA_DEVICE_H_
 
 #if defined _SKIA_SUPPORT_ || defined _SKIA_SUPPORT_PATHS_
 
 #include <memory>
@@ skipping 122 matching lines @@
                         const CFX_Matrix* pMatrix,
                         int blend_type);
 
   bool DrawDeviceText(int nChars,
                       const FXTEXT_CHARPOS* pCharPos,
                       CFX_Font* pFont,
                       const CFX_Matrix* pObject2Device,
                       FX_FLOAT font_size,
                       uint32_t color) override;
 
-#ifdef _SKIA_SUPPORT_
   bool DrawShading(const CPDF_ShadingPattern* pPattern,
                    const CFX_Matrix* pMatrix,
                    const FX_RECT& clip_rect,
                    int alpha,
                    bool bAlphaMode) override;
-#endif
 
   virtual uint8_t* GetBuffer() const;
 
   void PaintStroke(SkPaint* spaint,
                    const CFX_GraphStateData* pGraphState,
                    const SkMatrix& matrix);
   void Clear(uint32_t color);
   void Flush();
   SkPictureRecorder* GetRecorder() const { return m_pRecorder; }
   static void PreMultiply(CFX_DIBitmap* pDIBitmap);
-#ifdef _SKIA_SUPPORT_PATHS_
-  void UnPreMultiplyDevice();
-  void UnPreMultiply(CFX_DIBitmap* pDIBitmap);
-#endif
   SkCanvas* SkiaCanvas() { return m_pCanvas; }
   void DebugVerifyBitmapIsPreMultiplied() const;
   void Dump() const;
 
  private:
   friend class SkiaState;
 
   CFX_DIBitmap* m_pBitmap;
   CFX_DIBitmap* m_pOriDevice;
   SkCanvas* m_pCanvas;
   SkPictureRecorder* const m_pRecorder;
 #ifdef _SKIA_SUPPORT_
   std::unique_ptr<SkiaState> m_pCache;
 #endif
 #ifdef _SKIA_SUPPORT_PATHS_
   std::unique_ptr<CFX_ClipRgn> m_pClipRgn;
   std::vector<std::unique_ptr<CFX_ClipRgn>> m_StateStack;
   int m_FillFlags;
   bool m_bRgbByteOrder;
 #endif
   bool m_bGroupKnockout;
 };
 #endif  // defined(_SKIA_SUPPORT_)
 
 #endif  // CORE_FXGE_SKIA_FX_SKIA_DEVICE_H_