source/libs/libpng/libpng-1.6.17/contrib/gregbook/readpng.h

   1 /*---------------------------------------------------------------------------
   2
   3    rpng - simple PNG display program                              readpng.h
   4
   5   ---------------------------------------------------------------------------
   6
   7       Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.
   8
   9       This software is provided "as is," without warranty of any kind,
  10       express or implied.  In no event shall the author or contributors
  11       be held liable for any damages arising in any way from the use of
  12       this software.
  13
  14       The contents of this file are DUAL-LICENSED.  You may modify and/or
  15       redistribute this software according to the terms of one of the
  16       following two licenses (at your option):
  17
  18
  19       LICENSE 1 ("BSD-like with advertising clause"):
  20
  21       Permission is granted to anyone to use this software for any purpose,
  22       including commercial applications, and to alter it and redistribute
  23       it freely, subject to the following restrictions:
  24
  25       1. Redistributions of source code must retain the above copyright
  26          notice, disclaimer, and this list of conditions.
  27       2. Redistributions in binary form must reproduce the above copyright
  28          notice, disclaimer, and this list of conditions in the documenta-
  29          tion and/or other materials provided with the distribution.
  30       3. All advertising materials mentioning features or use of this
  31          software must display the following acknowledgment:
  32
  33             This product includes software developed by Greg Roelofs
  34             and contributors for the book, "PNG: The Definitive Guide,"
  35             published by O'Reilly and Associates.
  36
  37
  38       LICENSE 2 (GNU GPL v2 or later):
  39
  40       This program is free software; you can redistribute it and/or modify
  41       it under the terms of the GNU General Public License as published by
  42       the Free Software Foundation; either version 2 of the License, or
  43       (at your option) any later version.
  44
  45       This program is distributed in the hope that it will be useful,
  46       but WITHOUT ANY WARRANTY; without even the implied warranty of
  47       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  48       GNU General Public License for more details.
  49
  50       You should have received a copy of the GNU General Public License
  51       along with this program; if not, write to the Free Software Foundation,
  52       Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  53
  54   ---------------------------------------------------------------------------*/
  55
  56 #ifndef TRUE
  57 #  define TRUE 1
  58 #  define FALSE 0
  59 #endif
  60
  61 #ifndef MAX
  62 #  define MAX(a,b)  ((a) > (b)? (a) : (b))
  63 #  define MIN(a,b)  ((a) < (b)? (a) : (b))
  64 #endif
  65
  66 #ifdef DEBUG
  67 #  define Trace(x)  {fprintf x ; fflush(stderr); fflush(stdout);}
  68 #else
  69 #  define Trace(x)  ;
  70 #endif
  71
  72 typedef unsigned char   uch;
  73 typedef unsigned short  ush;
  74 typedef unsigned long   ulg;
  75
  76
  77 /* prototypes for public functions in readpng.c */
  78
  79 void readpng_version_info(void);
  80
  81 int readpng_init(FILE *infile, ulg *pWidth, ulg *pHeight);
  82
  83 int readpng_get_bgcolor(uch *bg_red, uch *bg_green, uch *bg_blue);
  84
  85 uch *readpng_get_image(double display_exponent, int *pChannels,
  86                        ulg *pRowbytes);
  87
  88 void readpng_cleanup(int free_image_data);