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 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 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 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 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 * 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 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
