add native draw bitmap with alpha mask

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_)
 
 #include "core/fxge/include/cfx_pathdata.h"
@@ skipping 66 matching lines @@
   FX_BOOL GetDIBits(CFX_DIBitmap* pBitmap, int left, int top) override;
 
   CFX_DIBitmap* GetBackDrop() override;
 
   FX_BOOL SetDIBits(const CFX_DIBSource* pBitmap,
                     uint32_t color,
                     const FX_RECT* pSrcRect,
                     int dest_left,
                     int dest_top,
                     int blend_type) override;
+  bool SetBitsWithMask(const CFX_DIBSource* pBitmap,
+                       const CFX_DIBSource* pMask,
+                       int dest_left,
+                       int dest_top,
+                       int bitmap_alpha,
+                       int blend_type) override;
   FX_BOOL StretchDIBits(const CFX_DIBSource* pBitmap,
                         uint32_t color,
                         int dest_left,
                         int dest_top,
                         int dest_width,
                         int dest_height,
                         const FX_RECT* pClipRect,
                         uint32_t flags,
                         int blend_type) override;
 
   FX_BOOL StartDIBits(const CFX_DIBSource* pBitmap,
                       int bitmap_alpha,
                       uint32_t color,
                       const CFX_Matrix* pMatrix,
                       uint32_t flags,
                       void*& handle,
                       int blend_type) override;
 
   FX_BOOL ContinueDIBits(void* handle, IFX_Pause* pPause) override;
 
   void CancelDIBits(void* handle) override {}
 
+  bool DrawBitsWithMask(const CFX_DIBSource* pBitmap,
+                        const CFX_DIBSource* pMask,
+                        int bitmap_alpha,
+                        const CFX_Matrix* pMatrix,
+                        int blend_type);
+
   FX_BOOL DrawDeviceText(int nChars,
                          const FXTEXT_CHARPOS* pCharPos,
                          CFX_Font* pFont,
                          CFX_FontCache* pCache,
                          const CFX_Matrix* pObject2Device,
                          FX_FLOAT font_size,
                          uint32_t color) override;
 
   FX_BOOL DrawShading(const CPDF_ShadingPattern* pPattern,
                       const CFX_Matrix* pMatrix,
                       const FX_RECT& clip_rect,
                       int alpha,
                       FX_BOOL bAlphaMode) override;
 
   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);
   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;
   std::unique_ptr<SkiaState> m_pCache;
   FX_BOOL m_bGroupKnockout;
 };
 #endif  // defined(_SKIA_SUPPORT_)
 
 #endif  // CORE_FXGE_SKIA_FX_SKIA_DEVICE_H_