1 /*****************************************************************************
2
3 gif_font.c - utility font handling and simple drawing for the GIF library
4
5 SPDX-License-Identifier: MIT
6
7 ****************************************************************************/
8
9 #include <string.h>
10 #include <stdlib.h>
11
12 #include "gif_lib.h"
13
14 /*****************************************************************************
15 Ascii 8 by 8 regular font - only first 128 characters are supported.
16 *****************************************************************************/
17
18 /*
19 * Each array entry holds the bits for 8 horizontal scan lines, topmost
20 * first. The most significant bit of each constant is the leftmost bit of
21 * the scan line.
22 */
23 /*@+charint@*/
24 const unsigned char GifAsciiTable8x8[][GIF_FONT_WIDTH] = {
25 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, /* Ascii 0 */
26 {0x3c, 0x42, 0xa5, 0x81, 0xbd, 0x42, 0x3c, 0x00}, /* Ascii 1 */
27 {0x3c, 0x7e, 0xdb, 0xff, 0xc3, 0x7e, 0x3c, 0x00}, /* Ascii 2 */
28 {0x00, 0xee, 0xfe, 0xfe, 0x7c, 0x38, 0x10, 0x00}, /* Ascii 3 */
29 {0x10, 0x38, 0x7c, 0xfe, 0x7c, 0x38, 0x10, 0x00}, /* Ascii 4 */
30 {0x00, 0x3c, 0x18, 0xff, 0xff, 0x08, 0x18, 0x00}, /* Ascii 5 */
31 {0x10, 0x38, 0x7c, 0xfe, 0xfe, 0x10, 0x38, 0x00}, /* Ascii 6 */
32 {0x00, 0x00, 0x18, 0x3c, 0x18, 0x00, 0x00, 0x00}, /* Ascii 7 */
33 {0xff, 0xff, 0xe7, 0xc3, 0xe7, 0xff, 0xff, 0xff}, /* Ascii 8 */
34 {0x00, 0x3c, 0x42, 0x81, 0x81, 0x42, 0x3c, 0x00}, /* Ascii 9 */
35 {0xff, 0xc3, 0xbd, 0x7e, 0x7e, 0xbd, 0xc3, 0xff}, /* Ascii 10 */
36 {0x1f, 0x07, 0x0d, 0x7c, 0xc6, 0xc6, 0x7c, 0x00}, /* Ascii 11 */
37 {0x00, 0x7e, 0xc3, 0xc3, 0x7e, 0x18, 0x7e, 0x18}, /* Ascii 12 */
38 {0x04, 0x06, 0x07, 0x04, 0x04, 0xfc, 0xf8, 0x00}, /* Ascii 13 */
39 {0x0c, 0x0a, 0x0d, 0x0b, 0xf9, 0xf9, 0x1f, 0x1f}, /* Ascii 14 */
40 {0x00, 0x92, 0x7c, 0x44, 0xc6, 0x7c, 0x92, 0x00}, /* Ascii 15 */
41 {0x00, 0x00, 0x60, 0x78, 0x7e, 0x78, 0x60, 0x00}, /* Ascii 16 */
42 {0x00, 0x00, 0x06, 0x1e, 0x7e, 0x1e, 0x06, 0x00}, /* Ascii 17 */
43 {0x18, 0x7e, 0x18, 0x18, 0x18, 0x18, 0x7e, 0x18}, /* Ascii 18 */
44 {0x66, 0x66, 0x66, 0x66, 0x66, 0x00, 0x66, 0x00}, /* Ascii 19 */
45 {0xff, 0xb6, 0x76, 0x36, 0x36, 0x36, 0x36, 0x00}, /* Ascii 20 */
46 {0x7e, 0xc1, 0xdc, 0x22, 0x22, 0x1f, 0x83, 0x7e}, /* Ascii 21 */
47 {0x00, 0x00, 0x00, 0x7e, 0x7e, 0x00, 0x00, 0x00}, /* Ascii 22 */
48 {0x18, 0x7e, 0x18, 0x18, 0x7e, 0x18, 0x00, 0xff}, /* Ascii 23 */
49 {0x18, 0x7e, 0x18, 0x18, 0x18, 0x18, 0x18, 0x00}, /* Ascii 24 */
50 {0x18, 0x18, 0x18, 0x18, 0x18, 0x7e, 0x18, 0x00}, /* Ascii 25 */
51 {0x00, 0x04, 0x06, 0xff, 0x06, 0x04, 0x00, 0x00}, /* Ascii 26 */
52 {0x00, 0x20, 0x60, 0xff, 0x60, 0x20, 0x00, 0x00}, /* Ascii 27 */
53 {0x00, 0x00, 0x00, 0xc0, 0xc0, 0xc0, 0xff, 0x00}, /* Ascii 28 */
54 {0x00, 0x24, 0x66, 0xff, 0x66, 0x24, 0x00, 0x00}, /* Ascii 29 */
55 {0x00, 0x00, 0x10, 0x38, 0x7c, 0xfe, 0x00, 0x00}, /* Ascii 30 */
56 {0x00, 0x00, 0x00, 0xfe, 0x7c, 0x38, 0x10, 0x00}, /* Ascii 31 */
57 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, /* */
58 {0x30, 0x30, 0x30, 0x30, 0x30, 0x00, 0x30, 0x00}, /* ! */
59 {0x66, 0x66, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, /* " */
60 {0x6c, 0x6c, 0xfe, 0x6c, 0xfe, 0x6c, 0x6c, 0x00}, /* # */
61 {0x10, 0x7c, 0xd2, 0x7c, 0x86, 0x7c, 0x10, 0x00}, /* $ */
62 {0xf0, 0x96, 0xfc, 0x18, 0x3e, 0x72, 0xde, 0x00}, /* % */
63 {0x30, 0x48, 0x30, 0x78, 0xce, 0xcc, 0x78, 0x00}, /* & */
64 {0x0c, 0x0c, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00}, /* ' */
65 {0x10, 0x60, 0xc0, 0xc0, 0xc0, 0x60, 0x10, 0x00}, /* ( */
66 {0x10, 0x0c, 0x06, 0x06, 0x06, 0x0c, 0x10, 0x00}, /* ) */
67 {0x00, 0x54, 0x38, 0xfe, 0x38, 0x54, 0x00, 0x00}, /* * */
68 {0x00, 0x18, 0x18, 0x7e, 0x18, 0x18, 0x00, 0x00}, /* + */
69 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x70}, /* , */
70 {0x00, 0x00, 0x00, 0x7e, 0x00, 0x00, 0x00, 0x00}, /* - */
71 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x00}, /* . */
72 {0x02, 0x06, 0x0c, 0x18, 0x30, 0x60, 0xc0, 0x00}, /* / */
73 {0x7c, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x7c, 0x00}, /* 0 */
74 {0x18, 0x38, 0x78, 0x18, 0x18, 0x18, 0x3c, 0x00}, /* 1 */
75 {0x7c, 0xc6, 0x06, 0x0c, 0x30, 0x60, 0xfe, 0x00}, /* 2 */
76 {0x7c, 0xc6, 0x06, 0x3c, 0x06, 0xc6, 0x7c, 0x00}, /* 3 */
77 {0x0e, 0x1e, 0x36, 0x66, 0xfe, 0x06, 0x06, 0x00}, /* 4 */
78 {0xfe, 0xc0, 0xc0, 0xfc, 0x06, 0x06, 0xfc, 0x00}, /* 5 */
79 {0x7c, 0xc6, 0xc0, 0xfc, 0xc6, 0xc6, 0x7c, 0x00}, /* 6 */
80 {0xfe, 0x06, 0x0c, 0x18, 0x30, 0x60, 0x60, 0x00}, /* 7 */
81 {0x7c, 0xc6, 0xc6, 0x7c, 0xc6, 0xc6, 0x7c, 0x00}, /* 8 */
82 {0x7c, 0xc6, 0xc6, 0x7e, 0x06, 0xc6, 0x7c, 0x00}, /* 9 */
83 {0x00, 0x30, 0x00, 0x00, 0x00, 0x30, 0x00, 0x00}, /* : */
84 {0x00, 0x30, 0x00, 0x00, 0x00, 0x30, 0x20, 0x00}, /* }, */
85 {0x00, 0x1c, 0x30, 0x60, 0x30, 0x1c, 0x00, 0x00}, /* < */
86 {0x00, 0x00, 0x7e, 0x00, 0x7e, 0x00, 0x00, 0x00}, /* = */
87 {0x00, 0x70, 0x18, 0x0c, 0x18, 0x70, 0x00, 0x00}, /* > */
88 {0x7c, 0xc6, 0x0c, 0x18, 0x30, 0x00, 0x30, 0x00}, /* ? */
89 {0x7c, 0x82, 0x9a, 0xaa, 0xaa, 0x9e, 0x7c, 0x00}, /* @ */
90 {0x38, 0x6c, 0xc6, 0xc6, 0xfe, 0xc6, 0xc6, 0x00}, /* A */
91 {0xfc, 0xc6, 0xc6, 0xfc, 0xc6, 0xc6, 0xfc, 0x00}, /* B */
92 {0x7c, 0xc6, 0xc6, 0xc0, 0xc0, 0xc6, 0x7c, 0x00}, /* C */
93 {0xf8, 0xcc, 0xc6, 0xc6, 0xc6, 0xcc, 0xf8, 0x00}, /* D */
94 {0xfe, 0xc0, 0xc0, 0xfc, 0xc0, 0xc0, 0xfe, 0x00}, /* E */
95 {0xfe, 0xc0, 0xc0, 0xfc, 0xc0, 0xc0, 0xc0, 0x00}, /* F */
96 {0x7c, 0xc6, 0xc0, 0xce, 0xc6, 0xc6, 0x7e, 0x00}, /* G */
97 {0xc6, 0xc6, 0xc6, 0xfe, 0xc6, 0xc6, 0xc6, 0x00}, /* H */
98 {0x78, 0x30, 0x30, 0x30, 0x30, 0x30, 0x78, 0x00}, /* I */
99 {0x1e, 0x06, 0x06, 0x06, 0xc6, 0xc6, 0x7c, 0x00}, /* J */
100 {0xc6, 0xcc, 0xd8, 0xf0, 0xd8, 0xcc, 0xc6, 0x00}, /* K */
101 {0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xfe, 0x00}, /* L */
102 {0xc6, 0xee, 0xfe, 0xd6, 0xc6, 0xc6, 0xc6, 0x00}, /* M */
103 {0xc6, 0xe6, 0xf6, 0xde, 0xce, 0xc6, 0xc6, 0x00}, /* N */
104 {0x7c, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x7c, 0x00}, /* O */
105 {0xfc, 0xc6, 0xc6, 0xfc, 0xc0, 0xc0, 0xc0, 0x00}, /* P */
106 {0x7c, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x7c, 0x06}, /* Q */
107 {0xfc, 0xc6, 0xc6, 0xfc, 0xc6, 0xc6, 0xc6, 0x00}, /* R */
108 {0x78, 0xcc, 0x60, 0x30, 0x18, 0xcc, 0x78, 0x00}, /* S */
109 {0xfc, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x00}, /* T */
110 {0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x7c, 0x00}, /* U */
111 {0xc6, 0xc6, 0xc6, 0xc6, 0xc6, 0x6c, 0x38, 0x00}, /* V */
112 {0xc6, 0xc6, 0xc6, 0xd6, 0xfe, 0xee, 0xc6, 0x00}, /* W */
113 {0xc6, 0xc6, 0x6c, 0x38, 0x6c, 0xc6, 0xc6, 0x00}, /* X */
114 {0xc3, 0xc3, 0x66, 0x3c, 0x18, 0x18, 0x18, 0x00}, /* Y */
115 {0xfe, 0x0c, 0x18, 0x30, 0x60, 0xc0, 0xfe, 0x00}, /* Z */
116 {0x3c, 0x30, 0x30, 0x30, 0x30, 0x30, 0x3c, 0x00}, /* [ */
117 {0xc0, 0x60, 0x30, 0x18, 0x0c, 0x06, 0x03, 0x00}, /* \ */
118 {0x3c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x3c, 0x00}, /* ] */
119 {0x00, 0x38, 0x6c, 0xc6, 0x00, 0x00, 0x00, 0x00}, /* ^ */
120 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff}, /* _ */
121 {0x30, 0x30, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00}, /* ` */
122 {0x00, 0x00, 0x7c, 0x06, 0x7e, 0xc6, 0x7e, 0x00}, /* a */
123 {0xc0, 0xc0, 0xfc, 0xc6, 0xc6, 0xe6, 0xdc, 0x00}, /* b */
124 {0x00, 0x00, 0x7c, 0xc6, 0xc0, 0xc0, 0x7e, 0x00}, /* c */
125 {0x06, 0x06, 0x7e, 0xc6, 0xc6, 0xce, 0x76, 0x00}, /* d */
126 {0x00, 0x00, 0x7c, 0xc6, 0xfe, 0xc0, 0x7e, 0x00}, /* e */
127 {0x1e, 0x30, 0x7c, 0x30, 0x30, 0x30, 0x30, 0x00}, /* f */
128 {0x00, 0x00, 0x7e, 0xc6, 0xce, 0x76, 0x06, 0x7c}, /* g */
129 {0xc0, 0xc0, 0xfc, 0xc6, 0xc6, 0xc6, 0xc6, 0x00}, /* */
130 {0x18, 0x00, 0x38, 0x18, 0x18, 0x18, 0x3c, 0x00}, /* i */
131 {0x18, 0x00, 0x38, 0x18, 0x18, 0x18, 0x18, 0xf0}, /* j */
132 {0xc0, 0xc0, 0xcc, 0xd8, 0xf0, 0xd8, 0xcc, 0x00}, /* k */
133 {0x38, 0x18, 0x18, 0x18, 0x18, 0x18, 0x3c, 0x00}, /* l */
134 {0x00, 0x00, 0xcc, 0xfe, 0xd6, 0xc6, 0xc6, 0x00}, /* m */
135 {0x00, 0x00, 0xfc, 0xc6, 0xc6, 0xc6, 0xc6, 0x00}, /* n */
136 {0x00, 0x00, 0x7c, 0xc6, 0xc6, 0xc6, 0x7c, 0x00}, /* o */
137 {0x00, 0x00, 0xfc, 0xc6, 0xc6, 0xe6, 0xdc, 0xc0}, /* p */
138 {0x00, 0x00, 0x7e, 0xc6, 0xc6, 0xce, 0x76, 0x06}, /* q */
139 {0x00, 0x00, 0x6e, 0x70, 0x60, 0x60, 0x60, 0x00}, /* r */
140 {0x00, 0x00, 0x7c, 0xc0, 0x7c, 0x06, 0xfc, 0x00}, /* s */
141 {0x30, 0x30, 0x7c, 0x30, 0x30, 0x30, 0x1c, 0x00}, /* t */
142 {0x00, 0x00, 0xc6, 0xc6, 0xc6, 0xc6, 0x7e, 0x00}, /* u */
143 {0x00, 0x00, 0xc6, 0xc6, 0xc6, 0x6c, 0x38, 0x00}, /* v */
144 {0x00, 0x00, 0xc6, 0xc6, 0xd6, 0xfe, 0x6c, 0x00}, /* w */
145 {0x00, 0x00, 0xc6, 0x6c, 0x38, 0x6c, 0xc6, 0x00}, /* x */
146 {0x00, 0x00, 0xc6, 0xc6, 0xce, 0x76, 0x06, 0x7c}, /* y */
147 {0x00, 0x00, 0xfc, 0x18, 0x30, 0x60, 0xfc, 0x00}, /* z */
148 {0x0e, 0x18, 0x18, 0x70, 0x18, 0x18, 0x0e, 0x00}, /* { */
149 {0x18, 0x18, 0x18, 0x00, 0x18, 0x18, 0x18, 0x00}, /* | */
150 {0xe0, 0x30, 0x30, 0x1c, 0x30, 0x30, 0xe0, 0x00}, /* } */
151 {0x00, 0x00, 0x70, 0x9a, 0x0e, 0x00, 0x00, 0x00}, /* ~ */
152 {0x00, 0x00, 0x18, 0x3c, 0x66, 0xff, 0x00, 0x00} /* Ascii 127 */
153 };
154 /*@=charint@*/
155
156 void
GifDrawText8x8(SavedImage * Image,const int x,const int y,const char * legend,const int color)157 GifDrawText8x8(SavedImage *Image,
158 const int x, const int y,
159 const char *legend,
160 const int color)
161 {
162 int i, j;
163 const char *cp;
164
165 for (i = 0; i < GIF_FONT_HEIGHT; i++) {
166 int base = Image->ImageDesc.Width * (y + i) + x;
167
168 for (cp = legend; *cp; cp++)
169 for (j = 0; j < GIF_FONT_WIDTH; j++) {
170 if (GifAsciiTable8x8[(short)(*cp)][i] & (1 << (GIF_FONT_WIDTH - j)))
171 Image->RasterBits[base] = color;
172 base++;
173 }
174 }
175 }
176
177 void
GifDrawBox(SavedImage * Image,const int x,const int y,const int w,const int d,const int color)178 GifDrawBox(SavedImage *Image,
179 const int x, const int y,
180 const int w, const int d,
181 const int color)
182 {
183 int j, base = Image->ImageDesc.Width * y + x;
184
185 for (j = 0; j < w; j++)
186 Image->RasterBits[base + j] =
187 Image->RasterBits[base + (d * Image->ImageDesc.Width) + j] = color;
188
189 for (j = 0; j < d; j++)
190 Image->RasterBits[base + j * Image->ImageDesc.Width] =
191 Image->RasterBits[base + j * Image->ImageDesc.Width + w] = color;
192 }
193
194 void
GifDrawRectangle(SavedImage * Image,const int x,const int y,const int w,const int d,const int color)195 GifDrawRectangle(SavedImage *Image,
196 const int x, const int y,
197 const int w, const int d,
198 const int color)
199 {
200 unsigned char *bp = Image->RasterBits + Image->ImageDesc.Width * y + x;
201 int i;
202
203 for (i = 0; i < d; i++)
204 memset(bp + (i * Image->ImageDesc.Width), color, (size_t)w);
205 }
206
207 void
GifDrawBoxedText8x8(SavedImage * Image,const int x,const int y,const char * legend,const int border,const int bg,const int fg)208 GifDrawBoxedText8x8(SavedImage *Image,
209 const int x, const int y,
210 const char *legend,
211 const int border,
212 const int bg, const int fg)
213 {
214 int j = 0, LineCount = 0, TextWidth = 0;
215 const char *cp;
216 char *dup;
217
218 /* compute size of text to box */
219 for (cp = legend; *cp; cp++)
220 if (*cp == '\r') {
221 if (j > TextWidth)
222 TextWidth = j;
223 j = 0;
224 LineCount++;
225 } else if (*cp != '\t')
226 ++j;
227 LineCount++; /* count last line */
228 if (j > TextWidth) /* last line might be longer than any previous */
229 TextWidth = j;
230
231 /* draw the text */
232 dup = malloc(strlen(legend)+1);
233 /* FIXME: should return bad status, but that would require API change */
234 if (dup != NULL) {
235 int i = 0;
236 /* fill the box */
237 GifDrawRectangle(Image, x + 1, y + 1,
238 border + TextWidth * GIF_FONT_WIDTH + border - 1,
239 border + LineCount * GIF_FONT_HEIGHT + border - 1, bg);
240 (void)strcpy(dup, (char *)legend);
241 char *lasts;
242 cp = strtok_r(dup, "\r\n", &lasts);
243 do {
244 int leadspace = 0;
245
246 if (cp[0] == '\t')
247 leadspace = (TextWidth - strlen(++cp)) / 2;
248
249 GifDrawText8x8(Image, x + border + (leadspace * GIF_FONT_WIDTH),
250 y + border + (GIF_FONT_HEIGHT * i++), cp, fg);
251 cp = strtok_r(NULL, "\r\n", &lasts);
252 } while (cp);
253 (void)free((void *)dup);
254
255 /* outline the box */
256 GifDrawBox(Image, x, y, border + TextWidth * GIF_FONT_WIDTH + border,
257 border + LineCount * GIF_FONT_HEIGHT + border, fg);
258 }
259 }
260
261 /* end */
262