support gradients and stroke+fill

core/fxge/apple/apple_int.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.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #ifndef CORE_FXGE_APPLE_APPLE_INT_H_
 #define CORE_FXGE_APPLE_APPLE_INT_H_
 
 #include "core/fxcrt/include/fx_system.h"
@@ skipping 155 matching lines @@
   void CancelDIBits(void* handle) override {}
   FX_BOOL DrawDeviceText(int nChars,
                          const FXTEXT_CHARPOS* pCharPos,
                          CFX_Font* pFont,
                          CFX_FontCache* pCache,
                          const CFX_Matrix* pObject2Device,
                          FX_FLOAT font_size,
                          FX_DWORD color,
                          int alpha_flag = 0,
                          void* pIccTransform = NULL) override;
-  void* GetPlatformSurface() override { return NULL; }
+  void* GetPlatformSurface() const override { return NULL; }
   void ClearDriver() override;
 
  protected:
   void setStrokeInfo(const CFX_GraphStateData* graphState,
                      FX_ARGB argb,
                      FX_FLOAT lineWidth);
   void setFillInfo(FX_ARGB argb);
   void setPathToContext(const CFX_PathData* pathData);
   FX_FLOAT getLineWidth(const CFX_GraphStateData* graphState,
                         CGAffineTransform ctm);
@@ skipping 75 matching lines @@
   int _totalSize;
 };
 
 uint32_t FX_GetHashCode(const FX_CHAR* pStr);
 FX_DWORD FX_IOSGetMatchFamilyNameHashcode(const FX_CHAR* pFontName);
 uint32_t FX_IOSGetFamilyNamesCount();
 const FX_CHAR* FX_IOSGetFamilyName(uint32_t uIndex);
 #endif
 
 #endif  // CORE_FXGE_APPLE_APPLE_INT_H_