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
 86typedef unsigned char   uch;
 87typedef unsigned short  ush;
 88typedef unsigned long   ulg;
 89
 90typedef 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
123void writepng_version_info(void);
124
125int writepng_init(mainprog_info *mainprog_ptr);
126
127int writepng_encode_image(mainprog_info *mainprog_ptr);
128
129int writepng_encode_row(mainprog_info *mainprog_ptr);
130
131int writepng_encode_finish(mainprog_info *mainprog_ptr);
132
133void writepng_cleanup(mainprog_info *mainprog_ptr);