// 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_FXCODEC_CODEC_CCODEC_PROGRESSIVEDECODER_H_
#define CORE_FXCODEC_CODEC_CCODEC_PROGRESSIVEDECODER_H_

#include <memory>
#include <vector>

#include "core/fxcodec/codec/ccodec_bmpmodule.h"
#include "core/fxcodec/codec/ccodec_gifmodule.h"
#include "core/fxcodec/codec/ccodec_pngmodule.h"
#include "core/fxcodec/codec/ccodec_tiffmodule.h"
#include "core/fxcodec/fx_codec_def.h"
#include "core/fxcodec/lgif/cgifcontext.h"
#include "core/fxcrt/cfx_retain_ptr.h"
#include "core/fxcrt/cfx_unowned_ptr.h"
#include "core/fxcrt/fx_system.h"
#include "core/fxge/fx_dib.h"

class CCodec_JpegModule;
class CCodec_ModuleMgr;
class CFX_DIBAttribute;
class IFX_SeekableReadStream;
struct FXJPEG_Context;

class CCodec_ProgressiveDecoder : public CCodec_BmpModule::Delegate,
                                  public CCodec_GifModule::Delegate,
                                  public CCodec_PngModule::Delegate {
 public:
  enum FXCodec_Format {
    FXCodec_Invalid = 0,
    FXCodec_1bppGray = 0x101,
    FXCodec_1bppRgb = 0x001,
    FXCodec_8bppGray = 0x108,
    FXCodec_8bppRgb = 0x008,
    FXCodec_Rgb = 0x018,
    FXCodec_Rgb32 = 0x020,
    FXCodec_Argb = 0x220,
    FXCodec_Cmyk = 0x120
  };

  explicit CCodec_ProgressiveDecoder(CCodec_ModuleMgr* pCodecMgr);
  virtual ~CCodec_ProgressiveDecoder();

  FXCODEC_STATUS LoadImageInfo(
      const CFX_RetainPtr<IFX_SeekableReadStream>& pFile,
      FXCODEC_IMAGE_TYPE imageType,
      CFX_DIBAttribute* pAttribute,
      bool bSkipImageTypeCheck);

  FXCODEC_IMAGE_TYPE GetType() const { return m_imagType; }
  int32_t GetWidth() const { return m_SrcWidth; }
  int32_t GetHeight() const { return m_SrcHeight; }
  int32_t GetNumComponents() const { return m_SrcComponents; }
  int32_t GetBPC() const { return m_SrcBPC; }
  void SetClipBox(FX_RECT* clip);

  FXCODEC_STATUS GetFrames(int32_t& frames);
  FXCODEC_STATUS StartDecode(const CFX_RetainPtr<CFX_DIBitmap>& pDIBitmap,
                             int start_x,
                             int start_y,
                             int size_x,
                             int size_y,
                             int32_t frames = 0,
                             bool bInterpol = true);

  FXCODEC_STATUS ContinueDecode();

  struct PixelWeight {
    int m_SrcStart;
    int m_SrcEnd;
    int m_Weights[1];
  };

  class CFXCODEC_WeightTable {
   public:
    CFXCODEC_WeightTable();
    ~CFXCODEC_WeightTable();

    void Calc(int dest_len,
              int dest_min,
              int dest_max,
              int src_len,
              int src_min,
              int src_max,
              bool bInterpol);
    PixelWeight* GetPixelWeight(int pixel) {
      return reinterpret_cast<PixelWeight*>(m_pWeightTables.data() +
                                            (pixel - m_DestMin) * m_ItemSize);
    }

    int m_DestMin;
    int m_ItemSize;
    std::vector<uint8_t> m_pWeightTables;
  };

  class CFXCODEC_HorzTable {
   public:
    CFXCODEC_HorzTable();
    ~CFXCODEC_HorzTable();

    void Calc(int dest_len, int src_len, bool bInterpol);
    PixelWeight* GetPixelWeight(int pixel) {
      return reinterpret_cast<PixelWeight*>(m_pWeightTables.data() +
                                            pixel * m_ItemSize);
    }

    int m_ItemSize;
    std::vector<uint8_t> m_pWeightTables;
  };

  class CFXCODEC_VertTable {
   public:
    CFXCODEC_VertTable();
    ~CFXCODEC_VertTable();

    void Calc(int dest_len, int src_len);
    PixelWeight* GetPixelWeight(int pixel) {
      return reinterpret_cast<PixelWeight*>(m_pWeightTables.data() +
                                            pixel * m_ItemSize);
    }
    int m_ItemSize;
    std::vector<uint8_t> m_pWeightTables;
  };

  CFX_RetainPtr<IFX_SeekableReadStream> m_pFile;
  CFX_UnownedPtr<CCodec_ModuleMgr> m_pCodecMgr;

  // TODO(tsepez): All these contexts probably should be unique_ptrs.
  FXJPEG_Context* m_pJpegContext;
  FXPNG_Context* m_pPngContext;
  std::unique_ptr<CGifContext> m_pGifContext;
  CCodec_BmpModule::Context* m_pBmpContext;
  CFX_UnownedPtr<CCodec_TiffContext> m_pTiffContext;
  FXCODEC_IMAGE_TYPE m_imagType;
  uint32_t m_offSet;
  uint8_t* m_pSrcBuf;
  uint32_t m_SrcSize;
  uint8_t* m_pDecodeBuf;
  int m_ScanlineSize;
  CFX_RetainPtr<CFX_DIBitmap> m_pDeviceBitmap;
  bool m_bInterpol;
  CFXCODEC_WeightTable m_WeightHorz;
  CFXCODEC_VertTable m_WeightVert;
  CFXCODEC_HorzTable m_WeightHorzOO;
  int m_SrcWidth;
  int m_SrcHeight;
  int m_SrcComponents;
  int m_SrcBPC;
  FX_RECT m_clipBox;
  int m_startX;
  int m_startY;
  int m_sizeX;
  int m_sizeY;
  int m_TransMethod;
  FX_ARGB* m_pSrcPalette;
  int m_SrcPaletteNumber;
  int m_SrcRow;
  FXCodec_Format m_SrcFormat;
  int m_SrcPassNumber;
  int m_FrameNumber;
  int m_FrameCur;
  int m_GifBgIndex;
  uint8_t* m_pGifPalette;
  int32_t m_GifPltNumber;
  int m_GifTransIndex;
  FX_RECT m_GifFrameRect;
  bool m_BmpIsTopBottom;
  FXCODEC_STATUS m_status;

  // CCodec_PngModule::Delegate
  bool PngReadHeader(int width,
                     int height,
                     int bpc,
                     int pass,
                     int* color_type,
                     double* gamma) override;
  bool PngAskScanlineBuf(int line, uint8_t*& src_buf) override;
  void PngFillScanlineBufCompleted(int pass, int line) override;

  // CCodec_GifModule::Delegate
  void GifRecordCurrentPosition(uint32_t& cur_pos) override;
  bool GifInputRecordPositionBuf(uint32_t rcd_pos,
                                 const FX_RECT& img_rc,
                                 int32_t pal_num,
                                 void* pal_ptr,
                                 int32_t delay_time,
                                 bool user_input,
                                 int32_t trans_index,
                                 int32_t disposal_method,
                                 bool interlace) override;
  void GifReadScanline(int32_t row_num, uint8_t* row_buf) override;

  // CCodec_BmpModule::Delegate
  bool BmpInputImagePositionBuf(uint32_t rcd_pos) override;
  void BmpReadScanline(int32_t row_num, uint8_t* row_buf) override;

 protected:
  bool BmpReadMoreData(CCodec_BmpModule* pBmpModule,
                       FXCODEC_STATUS& err_status);
  bool GifReadMoreData(CCodec_GifModule* pGifModule,
                       FXCODEC_STATUS& err_status);
  void GifDoubleLineResampleVert(
      const CFX_RetainPtr<CFX_DIBitmap>& pDeviceBitmap,
      double scale_y,
      int des_row);
  void PngOneOneMapResampleHorz(
      const CFX_RetainPtr<CFX_DIBitmap>& pDeviceBitmap,
      int32_t des_line,
      uint8_t* src_scan,
      FXCodec_Format src_format);
  bool DetectImageType(FXCODEC_IMAGE_TYPE imageType,
                       CFX_DIBAttribute* pAttribute);
  void GetDownScale(int& down_scale);
  void GetTransMethod(FXDIB_Format des_format, FXCodec_Format src_format);
  void ReSampleScanline(const CFX_RetainPtr<CFX_DIBitmap>& pDeviceBitmap,
                        int32_t des_line,
                        uint8_t* src_scan,
                        FXCodec_Format src_format);
  void Resample(const CFX_RetainPtr<CFX_DIBitmap>& pDeviceBitmap,
                int32_t src_line,
                uint8_t* src_scan,
                FXCodec_Format src_format);
  void ResampleVert(const CFX_RetainPtr<CFX_DIBitmap>& pDeviceBitmap,
                    double scale_y,
                    int des_row);
  bool JpegReadMoreData(CCodec_JpegModule* pJpegModule,
                        FXCODEC_STATUS& err_status);
  void ResampleVertBT(const CFX_RetainPtr<CFX_DIBitmap>& pDeviceBitmap,
                      double scale_y,
                      int des_row);
};

#endif  // CORE_FXCODEC_CODEC_CCODEC_PROGRESSIVEDECODER_H_