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1 /*---------------------------------------------------------------------------
2 
3    wpng - simple PNG-writing program                             writepng.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 #define TEXT_TITLE    0x01
73 #define TEXT_AUTHOR   0x02
74 #define TEXT_DESC     0x04
75 #define TEXT_COPY     0x08
76 #define TEXT_EMAIL    0x10
77 #define TEXT_URL      0x20
78 
79 #define TEXT_TITLE_OFFSET        0
80 #define TEXT_AUTHOR_OFFSET      72
81 #define TEXT_COPY_OFFSET     (2*72)
82 #define TEXT_EMAIL_OFFSET    (3*72)
83 #define TEXT_URL_OFFSET      (4*72)
84 #define TEXT_DESC_OFFSET     (5*72)
85 
86 typedef unsigned char   uch;
87 typedef unsigned short  ush;
88 typedef unsigned long   ulg;
89 
90 typedef struct _mainprog_info {
91     double gamma;
92     long width;
93     long height;
94     time_t modtime;
95     FILE *infile;
96     FILE *outfile;
97     void *png_ptr;
98     void *info_ptr;
99     uch *image_data;
100     uch **row_pointers;
101     char *title;
102     char *author;
103     char *desc;
104     char *copyright;
105     char *email;
106     char *url;
107     int filter;    /* command-line-filter flag, not PNG row filter! */
108     int pnmtype;
109     int sample_depth;
110     int interlaced;
111     int have_bg;
112     int have_time;
113     int have_text;
114     jmp_buf jmpbuf;
115     uch bg_red;
116     uch bg_green;
117     uch bg_blue;
118 } mainprog_info;
119 
120 
121 /* prototypes for public functions in writepng.c */
122 
123 void writepng_version_info(void);
124 
125 int writepng_init(mainprog_info *mainprog_ptr);
126 
127 int writepng_encode_image(mainprog_info *mainprog_ptr);
128 
129 int writepng_encode_row(mainprog_info *mainprog_ptr);
130 
131 int writepng_encode_finish(mainprog_info *mainprog_ptr);
132 
133 void writepng_cleanup(mainprog_info *mainprog_ptr);
134