source: libcaca/trunk/src/img2txt.c @ 1916

Last change on this file since 1916 was 1916, checked in by Jean-Yves Lamoureux, 12 years ago
  • Updated documentation to reflect img2irc name change, fixed typo in img2txt help
  • Property svn:keywords set to Id
File size: 6.3 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 1916 2007-11-07 09:44:26Z 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\t\t\tThis help\n");
47    fprintf(stderr, "  -W, --width=WIDTH\t\tWidth of resulting image\n");
48    fprintf(stderr, "  -H, --height=HEIGHT\t\tHeight of resulting image\n");
49    fprintf(stderr, "  -b, --brightness=BRIGHTNESS\tBrightness of resulting image\n");
50    fprintf(stderr, "  -c, --contrast=CONTRAST\tContrast of resulting image\n");
51    fprintf(stderr, "  -g, --gamma=GAMMA\t\tGamma of resulting image\n");
52    fprintf(stderr, "  -d, --dither=DITHER\t\tDithering algorithm to use :\n");
53    fprintf(stderr, "\t\t\tnone     : Nearest color\n");
54    fprintf(stderr, "\t\t\tordered2 : Ordered 2x2\n");
55    fprintf(stderr, "\t\t\tordered4 : Ordered 4x4\n");
56    fprintf(stderr, "\t\t\tordered8 : Ordered 8x8\n");
57    fprintf(stderr, "\t\t\trandom   : Random\n");
58    fprintf(stderr, "\t\t\tfstein   : Floyd Steinberg (default)\n");
59    fprintf(stderr, "  -f, --format=FORMAT\t\tFormat of the resulting image :\n");
60    fprintf(stderr, "\t\t\tansi : coloured ANSI (default)\n");
61    fprintf(stderr, "\t\t\tcaca : internal libcaca format\n");
62    fprintf(stderr, "\t\t\tutf8 : UTF8 with CR\n");
63    fprintf(stderr, "\t\t\tutf8 : UTF8 with CRLF (MS Windows)\n");
64    fprintf(stderr, "\t\t\thtml : HTML with CSS and DIV support\n");
65    fprintf(stderr, "\t\t\thtml3 : Pure HTML3 with tables\n");
66    fprintf(stderr, "\t\t\tirc  : IRC with ctrl-k codes\n");
67    fprintf(stderr, "\t\t\tps   : Postscript\n");
68    fprintf(stderr, "\t\t\tsvg  : Scalable Vector Graphics\n");
69    fprintf(stderr, "\t\t\ttga  : Targa Image\n\n");
70
71#if !defined(USE_IMLIB2)
72    fprintf(stderr, "NOTE: This program has NOT been built with Imlib2 support. Only BMP loading is supported.\n");
73#endif
74}
75
76int main(int argc, char **argv)
77{
78    /* libcucul context */
79    cucul_canvas_t *cv;
80    void *export;
81    unsigned long int len;
82    struct image *i;
83    unsigned int cols = 0, lines = 0;
84    char *format = NULL;
85    char *dither = NULL;
86    float gamma = -1, brightness = -1, contrast = -1;
87
88    if(argc < 2)
89    {
90        fprintf(stderr, "%s: wrong argument count\n", argv[0]);
91        usage(argc, argv);
92        return 1;
93    }
94
95    for(;;)
96    {
97        int option_index = 0;
98        static struct myoption long_options[] =
99        {
100            { "width",       1, NULL, 'W' },
101            { "height",      1, NULL, 'H' },
102            { "format",      1, NULL, 'f' },
103            { "dither",      1, NULL, 'd' },
104            { "gamma",       1, NULL, 'g' },
105            { "brightness",  1, NULL, 'b' },
106            { "contrast",    1, NULL, 'c' },
107            { "help",        0, NULL, 'h' },
108        };
109        int c = mygetopt(argc, argv, "W:H:f:d:g:b:c:h", long_options, &option_index);
110        if(c == -1)
111            break;
112
113        switch(c)
114        {
115        case 'W': /* --width */
116            cols = atoi(myoptarg);
117            break;
118        case 'H': /* --height */
119            lines = atoi(myoptarg);
120            break;
121        case 'f': /* --format */
122            format = myoptarg;
123            break;
124        case 'd': /* --dither */
125            dither = myoptarg;
126            break;
127        case 'h': /* --help */
128            usage(argc, argv);
129            return 0;
130            break;
131        case 'g': /* --gamma */
132            gamma = atof(myoptarg);
133            break;
134        case 'b': /* --brightness */
135            brightness = atof(myoptarg);
136            break;
137        case 'c': /* --contrast */
138            contrast = atof(myoptarg);
139            break;
140        default:
141            return 1;
142            break;
143        }
144    }
145
146
147    cv = cucul_create_canvas(0, 0);
148    if(!cv)
149    {
150        fprintf(stderr, "%s: unable to initialise libcucul\n", argv[0]);
151        return 1;
152    }
153
154    i = load_image(argv[argc-1]);
155    if(!i)
156    {
157        fprintf(stderr, "%s: unable to load %s\n", argv[0], argv[argc-1]);
158        cucul_free_canvas(cv);
159        return 1;
160    }
161
162    /* Assume a 6×10 font */
163    if(!cols && !lines)
164    {
165        cols = 60;
166        lines = cols * i->h * 6 / i->w / 10;
167    }
168    else if(cols && !lines)
169    {
170        lines = cols * i->h * 6 / i->w / 10;
171    }
172    else if(!cols && lines)
173    {
174        cols = lines * i->w * 10 / i->h / 6;
175    }
176
177
178    cucul_set_canvas_size(cv, cols, lines);
179    cucul_set_color_ansi(cv, CUCUL_DEFAULT, CUCUL_TRANSPARENT);
180    cucul_clear_canvas(cv);
181    if(cucul_set_dither_algorithm(i->dither, dither?dither:"fstein"))
182    {
183        fprintf(stderr, "%s: Can't dither image with algorithm '%s'\n", argv[0], dither);
184        unload_image(i);
185        cucul_free_canvas(cv);
186        return -1;
187    }
188
189    if(brightness!=-1) cucul_set_dither_brightness (i->dither, brightness);
190    if(contrast!=-1) cucul_set_dither_contrast (i->dither, contrast);
191    if(gamma!=-1) cucul_set_dither_gamma (i->dither, gamma);
192
193    cucul_dither_bitmap(cv, 0, 0, cols, lines, i->dither, i->pixels);
194
195    unload_image(i);
196
197    export = cucul_export_memory(cv, format?format:"ansi", &len);
198    if(!export)
199    {
200        fprintf(stderr, "%s: Can't export to format '%s'\n", argv[0], format);
201    }
202    else
203    {
204        fwrite(export, len, 1, stdout);
205        free(export);
206    }
207
208    cucul_free_canvas(cv);
209
210    return 0;
211}
212
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