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);