jpeg_progressive_decoder.h

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// Copyright 2020 The PDFium Authors
// 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_FXCODEC_JPEG_JPEG_PROGRESSIVE_DECODER_H_
#define CORE_FXCODEC_JPEG_JPEG_PROGRESSIVE_DECODER_H_
 
#include <setjmp.h>
 
#include <memory>
 
#include "core/fxcodec/progressive_decoder_iface.h"
 
namespace fxcodec {
 
class CFX_DIBAttribute;
 
class JpegProgressiveDecoder final : public ProgressiveDecoderIface {
 public:
  static void InitializeGlobals();
  static void DestroyGlobals();
 
  static JpegProgressiveDecoder* GetInstance();
 
  static std::unique_ptr<Context> Start();
 
  static jmp_buf& GetJumpMark(Context* pContext);
 
  static int ReadHeader(Context* pContext,
                        int* width,
                        int* height,
                        int* nComps,
                        CFX_DIBAttribute* pAttribute);
 
  static bool StartScanline(Context* pContext, int down_scale);
  static bool ReadScanline(Context* pContext, uint8_t* dest_buf);
 
  // ProgressiveDecoderIface:
  FX_FILESIZE GetAvailInput(Context* pContext) const override;
  bool Input(Context* pContext,
             RetainPtr<CFX_CodecMemory> codec_memory) override;
 
 private:
  JpegProgressiveDecoder();
  ~JpegProgressiveDecoder() override;
};
 
}  // namespace fxcodec
 
using JpegProgressiveDecoder = fxcodec::JpegProgressiveDecoder;
 
#endif  // CORE_FXCODEC_JPEG_JPEG_PROGRESSIVE_DECODER_H_