source: libcaca/trunk/src/img2txt.c @ 1908

Last change on this file since 1908 was 1908, checked in by Jean-Yves Lamoureux, 12 years ago
  • Fixed bad file error handling, made dither and export errors more informative on program name
  • Property svn:keywords set to Id
File size: 5.2 KB
Line 
1/*
2 *  img2txt       image to text converter
3 *  Copyright (c) 2006 Sam Hocevar <sam@zoy.org>
4 *                2007 Jean-Yves Lamoureux <jylam@lnxscene.org>
5 *                All Rights Reserved
6 *
7 *  $Id: img2txt.c 1908 2007-11-06 13:51:36Z jylam $
8 *
9 *  This program is free software. It comes without any warranty, to
10 *  the extent permitted by applicable law. You can redistribute it
11 *  and/or modify it under the terms of the Do What The Fuck You Want
12 *  To Public License, Version 2, as published by Sam Hocevar. See
13 *  http://sam.zoy.org/wtfpl/COPYING for more details.
14 */
15
16#include "config.h"
17#include "common.h"
18
19#if !defined(__KERNEL__)
20#   include <stdio.h>
21#   include <string.h>
22#   include <stdlib.h>
23#endif
24
25#if !defined HAVE_GETOPT_LONG
26#   include "mygetopt.h"
27#elif defined HAVE_GETOPT_H
28#   include <getopt.h>
29#endif
30#if defined HAVE_GETOPT_LONG
31#   define mygetopt getopt_long
32#   define myoptind optind
33#   define myoptarg optarg
34#   define myoption option
35#endif
36
37#include "cucul.h"
38#include "common-image.h"
39
40static void usage(int argc, char **argv)
41{
42    fprintf(stderr, "Usage: %s [OPTIONS]... <IMAGE>\n", argv[0]);
43    fprintf(stderr, "Convert IMAGE to any text based available format.\n");
44    fprintf(stderr, "Example : %s -w 80 -f ansi ./caca.png\n\n", argv[0]);
45    fprintf(stderr, "Options:\n");
46    fprintf(stderr, "  -h, --help\tThis help\n");
47    fprintf(stderr, "  -W, --width=WIDTH\tWidth of resulting image\n");
48    fprintf(stderr, "  -H, --height=HEIGHT\tHeight of resulting image\n");
49    fprintf(stderr, "  -d, --dither=DITHER\tDithering algorithm to use :\n");
50    fprintf(stderr, "\t\t\tnone     : Nearest color\n");
51    fprintf(stderr, "\t\t\tordered2 : Ordered 2x2\n");
52    fprintf(stderr, "\t\t\tordered4 : Ordered 4x4\n");
53    fprintf(stderr, "\t\t\tordered8 : Ordered 8x8\n");
54    fprintf(stderr, "\t\t\trandom   : Random\n");
55    fprintf(stderr, "\t\t\tfstein   : Floyd Steinberg (default)\n");
56    fprintf(stderr, "  -f, --format=FORMAT\tFormat of the resulting image :\n");
57    fprintf(stderr, "\t\t\tansi : coulored ANSI (default)\n");
58    fprintf(stderr, "\t\t\tcaca : internal libcaca format\n");
59    fprintf(stderr, "\t\t\tutf8 : UTF8 with CR\n");
60    fprintf(stderr, "\t\t\tutf8 : UTF8 with CRLF (MS Windows)\n");
61    fprintf(stderr, "\t\t\thtml : HTML with CSS and DIV support\n");
62    fprintf(stderr, "\t\t\thtml : Pure HTML3 with tables\n");
63    fprintf(stderr, "\t\t\tirc  : IRC with ctrl-k codes\n");
64    fprintf(stderr, "\t\t\tps   : Postscript\n");
65    fprintf(stderr, "\t\t\tsvg  : Scalable Vector Graphics\n");
66    fprintf(stderr, "\t\t\ttga  : Targa Image\n\n");
67}
68
69int main(int argc, char **argv)
70{
71    /* libcucul context */
72    cucul_canvas_t *cv;
73    void *export;
74    unsigned long int len;
75    struct image *i;
76    unsigned int cols = 0, lines = 0;
77    char *format = NULL;
78    char *dither = NULL;
79
80
81    if(argc < 2)
82    {
83        fprintf(stderr, "%s: wrong argument count\n", argv[0]);
84        usage(argc, argv);
85        return 1;
86    }
87
88    for(;;)
89    {
90        int option_index = 0;
91        static struct myoption long_options[] =
92        {
93            { "width",  1, NULL, 'W' },
94            { "height", 1, NULL, 'H' },
95            { "format", 1, NULL, 'f' },
96            { "dither", 1, NULL, 'd' },
97            { "help",   0, NULL, 'h' },
98        };
99        int c = mygetopt(argc, argv, "W:H:f:d:h", long_options, &option_index);
100        if(c == -1)
101            break;
102
103        switch(c)
104        {
105        case 'W': /* --width */
106            cols = atoi(myoptarg);
107            break;
108        case 'H': /* --height */
109            lines = atoi(myoptarg);
110            break;
111        case 'f': /* --format */
112            format = myoptarg;
113            break;
114        case 'd': /* --dither */
115            dither = myoptarg;
116            break;
117        case 'h': /* --help */
118            usage(argc, argv);
119            return 0;
120            break;
121        default:
122            return 1;
123            break;
124        }
125    }
126
127
128    cv = cucul_create_canvas(0, 0);
129    if(!cv)
130    {
131        fprintf(stderr, "%s: unable to initialise libcucul\n", argv[0]);
132        return 1;
133    }
134
135    i = load_image(argv[argc-1]);
136    if(!i)
137    {
138        fprintf(stderr, "%s: unable to load %s\n", argv[0], argv[argc-1]);
139        cucul_free_canvas(cv);
140        return 1;
141    }
142
143    /* Assume a 6×10 font */
144    if(!cols && !lines)
145    {
146        cols = 60;
147        lines = cols * i->h * 6 / i->w / 10;
148    }
149    else if(cols && !lines)
150    {
151        lines = cols * i->h * 6 / i->w / 10;
152    }
153    else if(!cols && lines)
154    {
155        cols = lines * i->w * 10 / i->h / 6;
156    }
157
158
159    cucul_set_canvas_size(cv, cols, lines);
160    cucul_set_color_ansi(cv, CUCUL_DEFAULT, CUCUL_TRANSPARENT);
161    cucul_clear_canvas(cv);
162    if(cucul_set_dither_algorithm(i->dither, dither?dither:"fstein"))
163    {
164        fprintf(stderr, "%s: Can't dither image with algorithm '%s'\n", argv[0], dither);
165        unload_image(i);
166        cucul_free_canvas(cv);
167        return -1;
168    }
169    cucul_dither_bitmap(cv, 0, 0, cols, lines, i->dither, i->pixels);
170
171    unload_image(i);
172
173    export = cucul_export_memory(cv, format?format:"ansi", &len);
174    if(!export)
175    {
176        fprintf(stderr, "%s: Can't export to format '%s'\n", argv[0], format);
177    }
178    else
179    {
180        fwrite(export, len, 1, stdout);
181        free(export);
182    }
183
184    cucul_free_canvas(cv);
185
186    return 0;
187}
188
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