include/loaders/GP_JPG.h

   1 /*****************************************************************************
   2  * This file is part of gfxprim library.                                     *
   3  *                                                                           *
   4  * Gfxprim is free software; you can redistribute it and/or                  *
   5  * modify it under the terms of the GNU Lesser General Public                *
   6  * License as published by the Free Software Foundation; either              *
   7  * version 2.1 of the License, or (at your option) any later version.        *
   8  *                                                                           *
   9  * Gfxprim is distributed in the hope that it will be useful,                *
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of            *
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU         *
  12  * Lesser General Public License for more details.                           *
  13  *                                                                           *
  14  * You should have received a copy of the GNU Lesser General Public          *
  15  * License along with gfxprim; if not, write to the Free Software            *
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor,                        *
  17  * Boston, MA  02110-1301  USA                                               *
  18  *                                                                           *
  19  * Copyright (C) 2009-2014 Cyril Hrubis <metan@ucw.cz>                       *
  20  *                                                                           *
  21  *****************************************************************************/
  22
  23  /*
  24
  25    JPEG support using jpeg library.
  26
  27   */
  28
  29 #ifndef LOADERS_GP_JPG_H
  30 #define LOADERS_GP_JPG_H
  31
  32 #include "loaders/GP_Loader.h"
  33
  34 /*
  35  * Reads a JPEG from an I/O stream.
  36  *
  37  * Returns newly allocated context cotaining the loaded image or in case of
  38  * failure NULL and errno is set.
  39  */
  40 GP_Context *GP_ReadJPG(GP_IO *io, GP_ProgressCallback *callback);
  41
  42 /*
  43  * Loads a JPEG image from a file.
  44  */
  45 GP_Context *GP_LoadJPG(const char *src_path, GP_ProgressCallback *callback);
  46
  47 /*
  48  * Loads JPEG meta-data, called markers in JPEG terminology.
  49  */
  50 int GP_ReadJPGMetaData(GP_IO *io, GP_MetaData *data);
  51 int GP_LoadJPGMetaData(const char *src_path, GP_MetaData *data);
  52
  53 /*
  54  * Writes JPEG into an I/O stream.
  55  */
  56 int GP_WriteJPG(const GP_Context *src, GP_IO *io,
  57                 GP_ProgressCallback *callback);
  58
  59 /*
  60  * Saves JPEG to a file.
  61  */
  62 int GP_SaveJPG(const GP_Context *src, const char *dst_path,
  63                GP_ProgressCallback *callback);
  64
  65 /*
  66  * Looks for JPEG file signature. Returns non-zero if found.
  67  */
  68 int GP_MatchJPG(const void *buf);
  69
  70 extern GP_Loader GP_JPG;
  71
  72 #endif /* LOADERS_GP_JPG_H */