JPEGImage.h

/*  IIP Server: JPEG input handler: Efficient decoding of tiles and regions from JPEG images
 
    Copyright (C) 2024-2025 Ruven Pillay.
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
*/
 
#ifndef _JPEGIMAGE_H
#define _JPEGIMAGE_H
 
#include "IIPImage.h"
#include <jpeglib.h>
 
 
 
#define TILESIZE 256
 
 
class JPEGImage : public IIPImage {
 
 private:
 
  FILE *_input;
 
  struct jpeg_decompress_struct cinfo;
  struct jpeg_error_mgr jerr;
 
 
 
  void process( unsigned int r, int l, int x, int y, unsigned int w, unsigned int h, void* d );
 
 
 
 public:
 
  JPEGImage() : IIPImage(){
    _input = NULL;
    tile_widths.push_back(TILESIZE); tile_heights.push_back(TILESIZE);
  };
 
 
 
  JPEGImage( const std::string& path )  : IIPImage(path){
    _input = NULL;
    tile_widths.push_back(TILESIZE); tile_heights.push_back(TILESIZE);
  };
 
 
 
  JPEGImage( const JPEGImage& image ): IIPImage( image ) {};
 
 
 
  JPEGImage( const IIPImage& image ) : IIPImage(image){
    _input = NULL;
    tile_widths.push_back(TILESIZE); tile_heights.push_back(TILESIZE);
  };
 
 
  ~JPEGImage(){ closeImage(); };
 
 
  void openImage();
 
 
 
  void loadImageInfo( int x, int y );
 
 
  void closeImage();
 
 
  bool regionDecoding(){ return true; };
 
 
 
  RawTile getTile( int x, int y, unsigned int r, int l, unsigned int t, ImageEncoding e = ImageEncoding::RAW );
 
 
 
  RawTile getRegion( int ha, int va, unsigned int res, int layers, int x, int y, unsigned int w, unsigned int h );
 
 
 
  static std::string getCodecVersion(){
#ifdef LIBJPEG_TURBO_VERSION
#define STRINGIFY(x) #x
#define TOSTRING(x) STRINGIFY(x)
    return "libjpeg-turbo " TOSTRING(LIBJPEG_TURBO_VERSION);
#else
    return "libjpeg-" JPEG_LIB_VERSION;
#endif
  };
 
};
 
#endif