1
2 /*
3 * Mesa 3-D graphics library
4 * Version: 3.5
5 *
6 * Copyright (C) 1999-2000 Brian Paul All Rights Reserved.
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice shall be included
16 * in all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
22 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
23 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
24 */
25
26
27 /* xfonts.c -- glXUseXFont() for Mesa written by
28 * Copyright (C) 1995 Thorsten.Ohl @ Physik.TH-Darmstadt.de
29 */
30
31 #ifdef __VMS
32 #include <GL/vms_x_fix.h>
33 #endif
34
35 #include "glxheader.h"
36 #include "main/context.h"
37 #include "main/imports.h"
38 #include "xfonts.h"
39
40
41 /* Some debugging info. */
42
43 #ifdef DEBUG
44 #undef _R
45 #undef _G
46 #undef _B
47 #include <ctype.h>
48
49 int debug_xfonts = 0;
50
51 static void
dump_char_struct(XCharStruct * ch,char * prefix)52 dump_char_struct(XCharStruct * ch, char *prefix)
53 {
54 printf("%slbearing = %d, rbearing = %d, width = %d\n",
55 prefix, ch->lbearing, ch->rbearing, ch->width);
56 printf("%sascent = %d, descent = %d, attributes = %u\n",
57 prefix, ch->ascent, ch->descent, (unsigned int) ch->attributes);
58 }
59
60 static void
dump_font_struct(XFontStruct * font)61 dump_font_struct(XFontStruct * font)
62 {
63 printf("ascent = %d, descent = %d\n", font->ascent, font->descent);
64 printf("char_or_byte2 = (%u,%u)\n",
65 font->min_char_or_byte2, font->max_char_or_byte2);
66 printf("byte1 = (%u,%u)\n", font->min_byte1, font->max_byte1);
67 printf("all_chars_exist = %s\n", font->all_chars_exist ? "True" : "False");
68 printf("default_char = %c (\\%03o)\n",
69 (char) (isprint(font->default_char) ? font->default_char : ' '),
70 font->default_char);
71 dump_char_struct(&font->min_bounds, "min> ");
72 dump_char_struct(&font->max_bounds, "max> ");
73 #if 0
74 for (c = font->min_char_or_byte2; c <= font->max_char_or_byte2; c++) {
75 char prefix[8];
76 sprintf(prefix, "%d> ", c);
77 dump_char_struct(&font->per_char[c], prefix);
78 }
79 #endif
80 }
81
82 static void
dump_bitmap(unsigned int width,unsigned int height,GLubyte * bitmap)83 dump_bitmap(unsigned int width, unsigned int height, GLubyte * bitmap)
84 {
85 unsigned int x, y;
86
87 printf(" ");
88 for (x = 0; x < 8 * width; x++)
89 printf("%o", 7 - (x % 8));
90 putchar('\n');
91 for (y = 0; y < height; y++) {
92 printf("%3o:", y);
93 for (x = 0; x < 8 * width; x++)
94 putchar((bitmap[width * (height - y - 1) + x / 8] & (1 << (7 - (x %
95 8))))
96 ? '*' : '.');
97 printf(" ");
98 for (x = 0; x < width; x++)
99 printf("0x%02x, ", bitmap[width * (height - y - 1) + x]);
100 putchar('\n');
101 }
102 }
103 #endif /* DEBUG */
104
105
106 /* Implementation. */
107
108 /* Fill a BITMAP with a character C from thew current font
109 in the graphics context GC. WIDTH is the width in bytes
110 and HEIGHT is the height in bits.
111
112 Note that the generated bitmaps must be used with
113
114 glPixelStorei (GL_UNPACK_SWAP_BYTES, GL_FALSE);
115 glPixelStorei (GL_UNPACK_LSB_FIRST, GL_FALSE);
116 glPixelStorei (GL_UNPACK_ROW_LENGTH, 0);
117 glPixelStorei (GL_UNPACK_SKIP_ROWS, 0);
118 glPixelStorei (GL_UNPACK_SKIP_PIXELS, 0);
119 glPixelStorei (GL_UNPACK_ALIGNMENT, 1);
120
121 Possible optimizations:
122
123 * use only one reusable pixmap with the maximum dimensions.
124 * draw the entire font into a single pixmap (careful with
125 proportional fonts!).
126 */
127
128
129 /*
130 * Generate OpenGL-compatible bitmap.
131 */
132 static void
fill_bitmap(Display * dpy,Window win,GC gc,unsigned int width,unsigned int height,int x0,int y0,unsigned int c,GLubyte * bitmap)133 fill_bitmap(Display * dpy, Window win, GC gc,
134 unsigned int width, unsigned int height,
135 int x0, int y0, unsigned int c, GLubyte * bitmap)
136 {
137 XImage *image;
138 unsigned int x, y;
139 Pixmap pixmap;
140 XChar2b char2b;
141
142 pixmap = XCreatePixmap(dpy, win, 8 * width, height, 1);
143 XSetForeground(dpy, gc, 0);
144 XFillRectangle(dpy, pixmap, gc, 0, 0, 8 * width, height);
145 XSetForeground(dpy, gc, 1);
146
147 char2b.byte1 = (c >> 8) & 0xff;
148 char2b.byte2 = (c & 0xff);
149
150 XDrawString16(dpy, pixmap, gc, x0, y0, &char2b, 1);
151
152 image = XGetImage(dpy, pixmap, 0, 0, 8 * width, height, 1, XYPixmap);
153 if (image) {
154 /* Fill the bitmap (X11 and OpenGL are upside down wrt each other). */
155 for (y = 0; y < height; y++)
156 for (x = 0; x < 8 * width; x++)
157 if (XGetPixel(image, x, y))
158 bitmap[width * (height - y - 1) + x / 8] |=
159 (1 << (7 - (x % 8)));
160 XDestroyImage(image);
161 }
162
163 XFreePixmap(dpy, pixmap);
164 }
165
166 /*
167 * determine if a given glyph is valid and return the
168 * corresponding XCharStruct.
169 */
170 static XCharStruct *
isvalid(XFontStruct * fs,unsigned int which)171 isvalid(XFontStruct * fs, unsigned int which)
172 {
173 unsigned int rows, pages;
174 unsigned int byte1 = 0, byte2 = 0;
175 int i, valid = 1;
176
177 rows = fs->max_byte1 - fs->min_byte1 + 1;
178 pages = fs->max_char_or_byte2 - fs->min_char_or_byte2 + 1;
179
180 if (rows == 1) {
181 /* "linear" fonts */
182 if ((fs->min_char_or_byte2 > which) || (fs->max_char_or_byte2 < which))
183 valid = 0;
184 }
185 else {
186 /* "matrix" fonts */
187 byte2 = which & 0xff;
188 byte1 = which >> 8;
189 if ((fs->min_char_or_byte2 > byte2) ||
190 (fs->max_char_or_byte2 < byte2) ||
191 (fs->min_byte1 > byte1) || (fs->max_byte1 < byte1))
192 valid = 0;
193 }
194
195 if (valid) {
196 if (fs->per_char) {
197 if (rows == 1) {
198 /* "linear" fonts */
199 return (fs->per_char + (which - fs->min_char_or_byte2));
200 }
201 else {
202 /* "matrix" fonts */
203 i = ((byte1 - fs->min_byte1) * pages) +
204 (byte2 - fs->min_char_or_byte2);
205 return (fs->per_char + i);
206 }
207 }
208 else {
209 return (&fs->min_bounds);
210 }
211 }
212 return (NULL);
213 }
214
215
216 void
Fake_glXUseXFont(Font font,int first,int count,int listbase)217 Fake_glXUseXFont(Font font, int first, int count, int listbase)
218 {
219 Display *dpy;
220 Window win;
221 Pixmap pixmap;
222 GC gc;
223 XGCValues values;
224 unsigned long valuemask;
225 XFontStruct *fs;
226 GLint swapbytes, lsbfirst, rowlength;
227 GLint skiprows, skippixels, alignment;
228 unsigned int max_width, max_height, max_bm_width, max_bm_height;
229 GLubyte *bm;
230 int i;
231
232 dpy = glXGetCurrentDisplay();
233 if (!dpy)
234 return; /* I guess glXMakeCurrent wasn't called */
235 win = RootWindow(dpy, DefaultScreen(dpy));
236
237 fs = XQueryFont(dpy, font);
238 if (!fs) {
239 _mesa_error(NULL, GL_INVALID_VALUE,
240 "Couldn't get font structure information");
241 return;
242 }
243
244 /* Allocate a bitmap that can fit all characters. */
245 max_width = fs->max_bounds.rbearing - fs->min_bounds.lbearing;
246 max_height = fs->max_bounds.ascent + fs->max_bounds.descent;
247 max_bm_width = (max_width + 7) / 8;
248 max_bm_height = max_height;
249
250 bm = (GLubyte *) MALLOC((max_bm_width * max_bm_height) * sizeof(GLubyte));
251 if (!bm) {
252 XFreeFontInfo(NULL, fs, 1);
253 _mesa_error(NULL, GL_OUT_OF_MEMORY,
254 "Couldn't allocate bitmap in glXUseXFont()");
255 return;
256 }
257
258 #if 0
259 /* get the page info */
260 pages = fs->max_char_or_byte2 - fs->min_char_or_byte2 + 1;
261 firstchar = (fs->min_byte1 << 8) + fs->min_char_or_byte2;
262 lastchar = (fs->max_byte1 << 8) + fs->max_char_or_byte2;
263 rows = fs->max_byte1 - fs->min_byte1 + 1;
264 unsigned int first_char, last_char, pages, rows;
265 #endif
266
267 /* Save the current packing mode for bitmaps. */
268 glGetIntegerv(GL_UNPACK_SWAP_BYTES, &swapbytes);
269 glGetIntegerv(GL_UNPACK_LSB_FIRST, &lsbfirst);
270 glGetIntegerv(GL_UNPACK_ROW_LENGTH, &rowlength);
271 glGetIntegerv(GL_UNPACK_SKIP_ROWS, &skiprows);
272 glGetIntegerv(GL_UNPACK_SKIP_PIXELS, &skippixels);
273 glGetIntegerv(GL_UNPACK_ALIGNMENT, &alignment);
274
275 /* Enforce a standard packing mode which is compatible with
276 fill_bitmap() from above. This is actually the default mode,
277 except for the (non)alignment. */
278 glPixelStorei(GL_UNPACK_SWAP_BYTES, GL_FALSE);
279 glPixelStorei(GL_UNPACK_LSB_FIRST, GL_FALSE);
280 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
281 glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
282 glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
283 glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
284
285 pixmap = XCreatePixmap(dpy, win, 10, 10, 1);
286 values.foreground = BlackPixel(dpy, DefaultScreen(dpy));
287 values.background = WhitePixel(dpy, DefaultScreen(dpy));
288 values.font = fs->fid;
289 valuemask = GCForeground | GCBackground | GCFont;
290 gc = XCreateGC(dpy, pixmap, valuemask, &values);
291 XFreePixmap(dpy, pixmap);
292
293 #ifdef DEBUG
294 if (debug_xfonts)
295 dump_font_struct(fs);
296 #endif
297
298 for (i = 0; i < count; i++) {
299 unsigned int width, height, bm_width, bm_height;
300 GLfloat x0, y0, dx, dy;
301 XCharStruct *ch;
302 int x, y;
303 unsigned int c = first + i;
304 int list = listbase + i;
305 int valid;
306
307 /* check on index validity and get the bounds */
308 ch = isvalid(fs, c);
309 if (!ch) {
310 ch = &fs->max_bounds;
311 valid = 0;
312 }
313 else {
314 valid = 1;
315 }
316
317 #ifdef DEBUG
318 if (debug_xfonts) {
319 char s[7];
320 sprintf(s, isprint(c) ? "%c> " : "\\%03o> ", c);
321 dump_char_struct(ch, s);
322 }
323 #endif
324
325 /* glBitmap()' parameters:
326 straight from the glXUseXFont(3) manpage. */
327 width = ch->rbearing - ch->lbearing;
328 height = ch->ascent + ch->descent;
329 x0 = -ch->lbearing;
330 y0 = ch->descent - 0; /* XXX used to subtract 1 here */
331 /* but that caused a conformace failure */
332 dx = ch->width;
333 dy = 0;
334
335 /* X11's starting point. */
336 x = -ch->lbearing;
337 y = ch->ascent;
338
339 /* Round the width to a multiple of eight. We will use this also
340 for the pixmap for capturing the X11 font. This is slightly
341 inefficient, but it makes the OpenGL part real easy. */
342 bm_width = (width + 7) / 8;
343 bm_height = height;
344
345 glNewList(list, GL_COMPILE);
346 if (valid && (bm_width > 0) && (bm_height > 0)) {
347
348 memset(bm, '\0', bm_width * bm_height);
349 fill_bitmap(dpy, win, gc, bm_width, bm_height, x, y, c, bm);
350
351 glBitmap(width, height, x0, y0, dx, dy, bm);
352 #ifdef DEBUG
353 if (debug_xfonts) {
354 printf("width/height = %u/%u\n", width, height);
355 printf("bm_width/bm_height = %u/%u\n", bm_width, bm_height);
356 dump_bitmap(bm_width, bm_height, bm);
357 }
358 #endif
359 }
360 else {
361 glBitmap(0, 0, 0.0, 0.0, dx, dy, NULL);
362 }
363 glEndList();
364 }
365
366 FREE(bm);
367 XFreeFontInfo(NULL, fs, 1);
368 XFreeGC(dpy, gc);
369
370 /* Restore saved packing modes. */
371 glPixelStorei(GL_UNPACK_SWAP_BYTES, swapbytes);
372 glPixelStorei(GL_UNPACK_LSB_FIRST, lsbfirst);
373 glPixelStorei(GL_UNPACK_ROW_LENGTH, rowlength);
374 glPixelStorei(GL_UNPACK_SKIP_ROWS, skiprows);
375 glPixelStorei(GL_UNPACK_SKIP_PIXELS, skippixels);
376 glPixelStorei(GL_UNPACK_ALIGNMENT, alignment);
377 }
378