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      1 // Copyright 2016 PDFium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
      6 
      7 #ifndef CORE_FXCODEC_CODEC_CCODEC_PNGMODULE_H_
      8 #define CORE_FXCODEC_CODEC_CCODEC_PNGMODULE_H_
      9 
     10 #include <memory>
     11 
     12 #include "core/fxcrt/fx_system.h"
     13 
     14 class CFX_DIBAttribute;
     15 
     16 class CCodec_PngModule {
     17  public:
     18   class Context {
     19    public:
     20     virtual ~Context() {}
     21   };
     22 
     23   class Delegate {
     24    public:
     25     virtual bool PngReadHeader(int width,
     26                                int height,
     27                                int bpc,
     28                                int pass,
     29                                int* color_type,
     30                                double* gamma) = 0;
     31 
     32     // Returns true on success. |pSrcBuf| will be set if this succeeds.
     33     // |pSrcBuf| does not take ownership of the buffer.
     34     virtual bool PngAskScanlineBuf(int line, uint8_t** pSrcBuf) = 0;
     35 
     36     virtual void PngFillScanlineBufCompleted(int pass, int line) = 0;
     37   };
     38 
     39   std::unique_ptr<Context> Start(Delegate* pDelegate);
     40   bool Input(Context* pContext,
     41              const uint8_t* src_buf,
     42              uint32_t src_size,
     43              CFX_DIBAttribute* pAttribute);
     44 };
     45 
     46 #endif  // CORE_FXCODEC_CODEC_CCODEC_PNGMODULE_H_
     47