source: toilet/trunk/src/figlet.c @ 1106

Last change on this file since 1106 was 1106, checked in by Sam Hocevar, 14 years ago
  • Improved support for figlet fonts. We can now load them and print text. Still no smushing, no hard blanks, no line wrapping...
  • Property svn:keywords set to Id
File size: 5.1 KB
Line 
1/*
2 *  TOIlet        The Other Implementation’s letters
3 *  Copyright (c) 2006 Sam Hocevar <sam@zoy.org>
4 *                All Rights Reserved
5 *
6 *  $Id: figlet.c 1106 2006-09-26 13:57:01Z sam $
7 *
8 *  This program is free software; you can redistribute it and/or
9 *  modify it under the terms of the Do What The Fuck You Want To
10 *  Public License, Version 2, as published by Sam Hocevar. See
11 *  http://sam.zoy.org/wtfpl/COPYING for more details.
12 */
13
14/*
15 * This file contains functions for handling FIGlet fonts.
16 */
17
18#include "config.h"
19
20#if defined(HAVE_INTTYPES_H)
21#   include <inttypes.h>
22#endif
23#include <stdio.h>
24#include <stdlib.h>
25#include <string.h>
26#include <cucul.h>
27
28#include "figlet.h"
29
30struct figfont
31{
32    /* From the font format */
33    unsigned char hardblank;
34    unsigned int height, baseline, max_length;
35    int old_layout;
36    unsigned int print_direction, full_layout, codetag_count;
37
38    unsigned int glyphs;
39    cucul_canvas_t *image;
40    unsigned int *lookup;
41};
42
43static struct figfont *open_font(char const *);
44static void free_font(struct figfont *);
45
46cucul_canvas_t *render_figlet(uint32_t const *string, unsigned int length,
47                              char const *fontname)
48{
49    cucul_canvas_t *cv;
50    struct figfont *font;
51    unsigned int x, i, c;
52
53    font = open_font(fontname);
54
55    cv = cucul_create_canvas(length * font->max_length, font->height);
56
57    for(x = 0, i = 0; i < length; i++)
58    {
59        for(c = 0; c < font->glyphs; c++)
60            if(font->lookup[c * 2] == string[i])
61                break;
62
63        if(c == font->glyphs)
64            continue;
65
66        cucul_blit(cv, x, - (int)(c * font->height), font->image, NULL);
67
68        x += font->lookup[c * 2 + 1];
69    }
70
71    free_font(font);
72
73    return cv;
74}
75
76static struct figfont *open_font(char const *fontname)
77{
78    char *data = NULL;
79    char path[2048];
80    struct figfont *font;
81    cucul_buffer_t *b;
82    FILE *f;
83    unsigned int i, j, size, comment_lines;
84
85    /* Open font */
86    snprintf(path, 2047, "/usr/share/figlet/%s.flf", fontname);
87    path[2047] = '\0';
88    f = fopen(path, "r");
89    if(!f)
90    {
91        fprintf(stderr, "font `%s' not found\n", path);
92        return NULL;
93    }
94
95    font = malloc(sizeof(struct figfont));
96
97    /* Read header */
98    font->print_direction = 0;
99    font->full_layout = 0;
100    font->codetag_count = 0;
101    if(fscanf(f, "flf2a%c %u %u %u %i %u %u %u %u\n", &font->hardblank,
102              &font->height, &font->baseline, &font->max_length,
103              &font->old_layout, &comment_lines, &font->print_direction,
104              &font->full_layout, &font->codetag_count) < 6)
105    {
106        fprintf(stderr, "font `%s' has invalid header\n", path);
107        free(font);
108        fclose(f);
109        return NULL;
110    }
111
112    /* Skip comment lines */
113    for(i = 0; i < comment_lines; i++)
114    {
115        fscanf(f, "%*[^\n]");
116        fscanf(f, "%*c");
117    }
118
119    /* Read mandatory characters (32-127, 196, 214, 220, 228, 246, 252, 223)
120     * then read additional characters. */
121    font->glyphs = 0;
122    font->lookup = NULL;
123
124    for(i = 0, size = 0; !feof(f); font->glyphs++)
125    {
126        if((font->glyphs % 2048) == 0)
127            font->lookup = realloc(font->lookup,
128                                   (font->glyphs + 2048) * 2 * sizeof(int));
129
130        if(font->glyphs < 127 - 32)
131        {
132            font->lookup[font->glyphs * 2] = 32 + font->glyphs;
133        }
134        else if(font->glyphs < (127 - 32) + 7)
135        {
136            static int const tab[7] = { 196, 214, 220, 228, 246, 252, 223 };
137            font->lookup[font->glyphs * 2] = tab[font->glyphs = (127 - 32)];
138        }
139        else
140        {
141            fscanf(f, "%u %*[^\n]", &font->lookup[font->glyphs * 2]);
142            fscanf(f, "%*c");
143        }
144
145        font->lookup[font->glyphs * 2 + 1] = 0;
146
147        for(j = 0; j < font->height; j++)
148        {
149            if(i + 2048 >= size)
150                data = realloc(data, size += 2048);
151
152            fgets(data + i, 2048, f);
153            i = (uintptr_t)strchr(data + i, 0) - (uintptr_t)data;
154        }
155    }
156
157    fclose(f);
158
159    /* Import buffer into canvas */
160    b = cucul_load_memory(data, i);
161    font->image = cucul_import_canvas(b, "ansi");
162    cucul_free_buffer(b);
163    free(data);
164
165    /* Remove EOL characters. For now we ignore hardblanks, don’t do any
166     * smushing, nor any kind of error checking. */
167    for(j = 0; j < font->height * font->glyphs; j++)
168    {
169        unsigned long int ch, oldch = 0;
170
171        for(i = font->max_length; i--;)
172        {
173            ch = cucul_getchar(font->image, i, j);
174
175            if(ch == font->hardblank)
176                cucul_putchar(font->image, i, j, ' ');
177            else if(oldch && ch != oldch)
178            {
179                if(!font->lookup[j / font->height * 2 + 1])
180                    font->lookup[j / font->height * 2 + 1] = i + 1;
181            }
182            else if(oldch && ch == oldch)
183                cucul_putchar(font->image, i, j, ' ');
184            else if(ch != ' ')
185            {
186                oldch = ch;
187                cucul_putchar(font->image, i, j, ' ');
188            }
189        }
190    }
191
192    return font;
193}
194
195static void free_font(struct figfont *font)
196{
197    free(font->lookup);
198    free(font);
199}
200
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