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);