core/include/fxcodec/fx_codec_provider.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_INCLUDE_FXCODEC_FX_CODEC_PROVIDER_H_
#define CORE_INCLUDE_FXCODEC_FX_CODEC_PROVIDER_H_

#include "../fxcrt/fx_system.h"

class IFX_JpegProvider {
 public:
  virtual void Release() = 0;

  virtual void* CreateDecoder(const uint8_t* src_buf,
                              FX_DWORD src_size,
                              int width,
                              int height,
                              int nComps,
                              FX_BOOL ColorTransform) = 0;

  virtual void DestroyDecoder(void* pDecoder) = 0;

  virtual void DownScale(void* pDecoder, int dest_width, int dest_height) = 0;

  virtual FX_BOOL Rewind(void* pDecoder) = 0;

  virtual uint8_t* GetNextLine(void* pDecoder) = 0;

  virtual FX_DWORD GetSrcOffset(void* pDecoder) = 0;

  virtual FX_BOOL LoadInfo(const uint8_t* src_buf,
                           FX_DWORD src_size,
                           int& width,
                           int& height,
                           int& num_components,
                           int& bits_per_components,
                           FX_BOOL& color_transform,
                           uint8_t** icc_buf_ptr = NULL,
                           FX_DWORD* icc_length = NULL) = 0;

  virtual FX_BOOL Encode(const class CFX_DIBSource* pSource,
                         uint8_t*& dest_buf,
                         FX_STRSIZE& dest_size,
                         int quality = 75,
                         const uint8_t* icc_buf = NULL,
                         FX_DWORD icc_length = 0) = 0;

  virtual void* Start() = 0;

  virtual void Finish(void* pContext) = 0;

  virtual void Input(void* pContext,
                     const uint8_t* src_buf,
                     FX_DWORD src_size) = 0;

  virtual int ReadHeader(void* pContext,
                         int* width,
                         int* height,
                         int* nComps) = 0;

  virtual int StartScanline(void* pContext, int down_scale) = 0;

  virtual FX_BOOL ReadScanline(void* pContext, uint8_t* dest_buf) = 0;

  virtual FX_DWORD GetAvailInput(void* pContext,
                                 uint8_t** avail_buf_ptr = NULL) = 0;

 protected:
  ~IFX_JpegProvider() {}
};

#endif  // CORE_INCLUDE_FXCODEC_FX_CODEC_PROVIDER_H_