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      1 /*---------------------------------------------------------------------------
      2 
      3    rpng2 - progressive-model PNG display program                 readpng2.h
      4 
      5   ---------------------------------------------------------------------------
      6 
      7       Copyright (c) 1998-2008 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 enum rpng2_states {
     73     kPreInit = 0,
     74     kWindowInit,
     75     kDone
     76 };
     77 
     78 typedef unsigned char   uch;
     79 typedef unsigned short  ush;
     80 typedef unsigned long   ulg;
     81 
     82 typedef struct _mainprog_info {
     83     double display_exponent;
     84     ulg width;
     85     ulg height;
     86     void *png_ptr;
     87     void *info_ptr;
     88     void (*mainprog_init)(void);
     89     void (*mainprog_display_row)(ulg row_num);
     90     void (*mainprog_finish_display)(void);
     91     uch *image_data;
     92     uch **row_pointers;
     93     jmp_buf jmpbuf;
     94     int passes;              /* not used */
     95     int pass;
     96     int rowbytes;
     97     int channels;
     98     int need_bgcolor;
     99 #if (defined(__i386__) || defined(_M_IX86) || defined(__x86_64__))
    100     int nommxfilters;
    101     int nommxcombine;
    102     int nommxinterlace;
    103 #endif
    104     int state;
    105     uch bg_red;
    106     uch bg_green;
    107     uch bg_blue;
    108 } mainprog_info;
    109 
    110 
    111 /* prototypes for public functions in readpng2.c */
    112 
    113 void readpng2_version_info(void);
    114 
    115 int readpng2_check_sig(uch *sig, int num);
    116 
    117 int readpng2_init(mainprog_info *mainprog_ptr);
    118 
    119 int readpng2_decode_data(mainprog_info *mainprog_ptr, uch *rawbuf, ulg length);
    120 
    121 void readpng2_cleanup(mainprog_info *mainprog_ptr);
    122