include/loaders/GP_PNG.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) 2009-2011 Cyril Hrubis <metan@ucw.cz>                       *
  20  *                                                                           *
  21  *****************************************************************************/
  22
  23  /*
  24
  25    PNG support using libpng library.
  26
  27   */
  28
  29 #ifndef LOADERS_GP_PNG_H
  30 #define LOADERS_GP_PNG_H
  31
  32 #include "core/GP_ProgressCallback.h"
  33 #include "core/GP_Context.h"
  34
  35 /*
  36  * Opens up file and checks signature. Upon successful return the file
  37  * possition would be set to eight bytes (exactly after the PNG signature).
  38  */
  39 GP_RetCode GP_OpenPNG(const char *src_path, FILE **f);
  40
  41 /*
  42  * Reads PNG from an open FILE. Expects the file possition set after the eight
  43  * bytes PNG signature.
  44  */
  45 GP_RetCode GP_ReadPNG(FILE *f, GP_Context **res,
  46                       GP_ProgressCallback *callback);
  47
  48 /*
  49  * Loads a PNG file into GP_Context. The Context is newly allocated.
  50  */
  51 GP_RetCode GP_LoadPNG(const char *src_path, GP_Context **res,
  52                       GP_ProgressCallback *callback);
  53
  54 /*
  55  * Saves PNG to a file.
  56  */
  57 GP_RetCode GP_SavePNG(const char *dst_path, const GP_Context *src,
  58                       GP_ProgressCallback *callback);
  59
  60 #endif /* LOADERS_GP_PNG_H */