bmp_decoder.h

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// Copyright 2016 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_BMP_BMP_DECODER_H_
#define CORE_FXCODEC_BMP_BMP_DECODER_H_
 
#include <memory>
 
#include "core/fxcodec/progressive_decoder_iface.h"
#include "core/fxcrt/fx_system.h"
#include "core/fxcrt/retain_ptr.h"
#include "core/fxcrt/span.h"
#include "core/fxge/dib/fx_dib.h"
 
#ifndef PDF_ENABLE_XFA_BMP
#error "BMP must be enabled"
#endif
 
namespace fxcodec {
 
class CFX_DIBAttribute;
 
class BmpDecoder {
 public:
  class Delegate {
   public:
    virtual bool BmpInputImagePositionBuf(uint32_t rcd_pos) = 0;
    virtual void BmpReadScanline(uint32_t row_num,
                                 pdfium::span<const uint8_t> row_buf) = 0;
  };
 
  enum class Status : uint8_t { kFail, kSuccess, kContinue };
 
  static std::unique_ptr<ProgressiveDecoderIface::Context> StartDecode(
      Delegate* pDelegate);
  static Status ReadHeader(ProgressiveDecoderIface::Context* pContext,
                           int32_t* width,
                           int32_t* height,
                           bool* tb_flag,
                           int32_t* components,
                           pdfium::span<const FX_ARGB>* palette,
                           CFX_DIBAttribute* pAttribute);
  static Status LoadImage(ProgressiveDecoderIface::Context* pContext);
  static FX_FILESIZE GetAvailInput(ProgressiveDecoderIface::Context* pContext);
  static bool Input(ProgressiveDecoderIface::Context* pContext,
                    RetainPtr<CFX_CodecMemory> codec_memory);
 
  BmpDecoder() = delete;
  BmpDecoder(const BmpDecoder&) = delete;
  BmpDecoder& operator=(const BmpDecoder&) = delete;
};
 
}  // namespace fxcodec
 
using BmpDecoder = fxcodec::BmpDecoder;
 
#endif  // CORE_FXCODEC_BMP_BMP_DECODER_H_