1 /* 2 * Mesa 3-D graphics library 3 * Version: 7.6 4 * 5 * Copyright (C) 1995 Thorsten.Ohl @ Physik.TH-Darmstadt.de 6 * Copyright (C) 1999-2008 Brian Paul All Rights Reserved. 7 * Copyright (C) 2009 VMware, Inc. All Rights Reserved. 8 * 9 * Permission is hereby granted, free of charge, to any person obtaining a 10 * copy of this software and associated documentation files (the "Software"), 11 * to deal in the Software without restriction, including without limitation 12 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 13 * and/or sell copies of the Software, and to permit persons to whom the 14 * Software is furnished to do so, subject to the following conditions: 15 * 16 * The above copyright notice and this permission notice shall be included 17 * in all copies or substantial portions of the Software. 18 * 19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 20 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 22 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN 23 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 24 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 25 */ 26 27 28 /** 29 * Fake implementation of glXUseXFont(). 30 */ 31 32 33 #include "main/core.h" 34 #include <GL/glx.h> 35 36 37 /* Some debugging info. */ 38 39 #ifdef DEBUG 40 #include <ctype.h> 41 42 int debug_xfonts = 0; 43 44 static void 45 dump_char_struct(XCharStruct * ch, char *prefix) 46 { 47 printf("%slbearing = %d, rbearing = %d, width = %d\n", 48 prefix, ch->lbearing, ch->rbearing, ch->width); 49 printf("%sascent = %d, descent = %d, attributes = %u\n", 50 prefix, ch->ascent, ch->descent, (unsigned int) ch->attributes); 51 } 52 53 static void 54 dump_font_struct(XFontStruct * font) 55 { 56 printf("ascent = %d, descent = %d\n", font->ascent, font->descent); 57 printf("char_or_byte2 = (%u,%u)\n", 58 font->min_char_or_byte2, font->max_char_or_byte2); 59 printf("byte1 = (%u,%u)\n", font->min_byte1, font->max_byte1); 60 printf("all_chars_exist = %s\n", font->all_chars_exist ? "True" : "False"); 61 printf("default_char = %c (\\%03o)\n", 62 (char) (isprint(font->default_char) ? font->default_char : ' '), 63 font->default_char); 64 dump_char_struct(&font->min_bounds, "min> "); 65 dump_char_struct(&font->max_bounds, "max> "); 66 #if 0 67 for (c = font->min_char_or_byte2; c <= font->max_char_or_byte2; c++) { 68 char prefix[8]; 69 sprintf(prefix, "%d> ", c); 70 dump_char_struct(&font->per_char[c], prefix); 71 } 72 #endif 73 } 74 75 static void 76 dump_bitmap(unsigned int width, unsigned int height, GLubyte * bitmap) 77 { 78 unsigned int x, y; 79 80 printf(" "); 81 for (x = 0; x < 8 * width; x++) 82 printf("%o", 7 - (x % 8)); 83 putchar('\n'); 84 for (y = 0; y < height; y++) { 85 printf("%3o:", y); 86 for (x = 0; x < 8 * width; x++) 87 putchar((bitmap[width * (height - y - 1) + x / 8] & (1 << (7 - (x % 88 8)))) 89 ? '*' : '.'); 90 printf(" "); 91 for (x = 0; x < width; x++) 92 printf("0x%02x, ", bitmap[width * (height - y - 1) + x]); 93 putchar('\n'); 94 } 95 } 96 #endif /* DEBUG */ 97 98 99 /* Implementation. */ 100 101 /* Fill a BITMAP with a character C from thew current font 102 in the graphics context GC. WIDTH is the width in bytes 103 and HEIGHT is the height in bits. 104 105 Note that the generated bitmaps must be used with 106 107 glPixelStorei (GL_UNPACK_SWAP_BYTES, GL_FALSE); 108 glPixelStorei (GL_UNPACK_LSB_FIRST, GL_FALSE); 109 glPixelStorei (GL_UNPACK_ROW_LENGTH, 0); 110 glPixelStorei (GL_UNPACK_SKIP_ROWS, 0); 111 glPixelStorei (GL_UNPACK_SKIP_PIXELS, 0); 112 glPixelStorei (GL_UNPACK_ALIGNMENT, 1); 113 114 Possible optimizations: 115 116 * use only one reusable pixmap with the maximum dimensions. 117 * draw the entire font into a single pixmap (careful with 118 proportional fonts!). 119 */ 120 121 122 /* 123 * Generate OpenGL-compatible bitmap. 124 */ 125 static void 126 fill_bitmap(Display * dpy, Window win, GC gc, 127 unsigned int width, unsigned int height, 128 int x0, int y0, unsigned int c, GLubyte * bitmap) 129 { 130 XImage *image; 131 unsigned int x, y; 132 Pixmap pixmap; 133 XChar2b char2b; 134 135 pixmap = XCreatePixmap(dpy, win, 8 * width, height, 1); 136 XSetForeground(dpy, gc, 0); 137 XFillRectangle(dpy, pixmap, gc, 0, 0, 8 * width, height); 138 XSetForeground(dpy, gc, 1); 139 140 char2b.byte1 = (c >> 8) & 0xff; 141 char2b.byte2 = (c & 0xff); 142 143 XDrawString16(dpy, pixmap, gc, x0, y0, &char2b, 1); 144 145 image = XGetImage(dpy, pixmap, 0, 0, 8 * width, height, 1, XYPixmap); 146 if (image) { 147 /* Fill the bitmap (X11 and OpenGL are upside down wrt each other). */ 148 for (y = 0; y < height; y++) 149 for (x = 0; x < 8 * width; x++) 150 if (XGetPixel(image, x, y)) 151 bitmap[width * (height - y - 1) + x / 8] |= 152 (1 << (7 - (x % 8))); 153 XDestroyImage(image); 154 } 155 156 XFreePixmap(dpy, pixmap); 157 } 158 159 /* 160 * determine if a given glyph is valid and return the 161 * corresponding XCharStruct. 162 */ 163 static XCharStruct * 164 isvalid(XFontStruct * fs, unsigned int which) 165 { 166 unsigned int rows, pages; 167 unsigned int byte1 = 0, byte2 = 0; 168 int i, valid = 1; 169 170 rows = fs->max_byte1 - fs->min_byte1 + 1; 171 pages = fs->max_char_or_byte2 - fs->min_char_or_byte2 + 1; 172 173 if (rows == 1) { 174 /* "linear" fonts */ 175 if ((fs->min_char_or_byte2 > which) || (fs->max_char_or_byte2 < which)) 176 valid = 0; 177 } 178 else { 179 /* "matrix" fonts */ 180 byte2 = which & 0xff; 181 byte1 = which >> 8; 182 if ((fs->min_char_or_byte2 > byte2) || 183 (fs->max_char_or_byte2 < byte2) || 184 (fs->min_byte1 > byte1) || (fs->max_byte1 < byte1)) 185 valid = 0; 186 } 187 188 if (valid) { 189 if (fs->per_char) { 190 if (rows == 1) { 191 /* "linear" fonts */ 192 return (fs->per_char + (which - fs->min_char_or_byte2)); 193 } 194 else { 195 /* "matrix" fonts */ 196 i = ((byte1 - fs->min_byte1) * pages) + 197 (byte2 - fs->min_char_or_byte2); 198 return (fs->per_char + i); 199 } 200 } 201 else { 202 return (&fs->min_bounds); 203 } 204 } 205 return (NULL); 206 } 207 208 209 PUBLIC void 210 glXUseXFont(Font font, int first, int count, int listbase) 211 { 212 Display *dpy; 213 Window win; 214 Pixmap pixmap; 215 GC gc; 216 XGCValues values; 217 unsigned long valuemask; 218 XFontStruct *fs; 219 GLint swapbytes, lsbfirst, rowlength; 220 GLint skiprows, skippixels, alignment; 221 unsigned int max_width, max_height, max_bm_width, max_bm_height; 222 GLubyte *bm; 223 int i; 224 225 dpy = glXGetCurrentDisplay(); 226 if (!dpy) 227 return; /* I guess glXMakeCurrent wasn't called */ 228 i = DefaultScreen(dpy); 229 win = RootWindow(dpy, i); 230 231 fs = XQueryFont(dpy, font); 232 if (!fs) { 233 _mesa_error(NULL, GL_INVALID_VALUE, 234 "Couldn't get font structure information"); 235 return; 236 } 237 238 /* Allocate a bitmap that can fit all characters. */ 239 max_width = fs->max_bounds.rbearing - fs->min_bounds.lbearing; 240 max_height = fs->max_bounds.ascent + fs->max_bounds.descent; 241 max_bm_width = (max_width + 7) / 8; 242 max_bm_height = max_height; 243 244 bm = (GLubyte *) MALLOC((max_bm_width * max_bm_height) * sizeof(GLubyte)); 245 if (!bm) { 246 XFreeFontInfo(NULL, fs, 1); 247 _mesa_error(NULL, GL_OUT_OF_MEMORY, 248 "Couldn't allocate bitmap in glXUseXFont()"); 249 return; 250 } 251 252 #if 0 253 /* get the page info */ 254 pages = fs->max_char_or_byte2 - fs->min_char_or_byte2 + 1; 255 firstchar = (fs->min_byte1 << 8) + fs->min_char_or_byte2; 256 lastchar = (fs->max_byte1 << 8) + fs->max_char_or_byte2; 257 rows = fs->max_byte1 - fs->min_byte1 + 1; 258 unsigned int first_char, last_char, pages, rows; 259 #endif 260 261 /* Save the current packing mode for bitmaps. */ 262 glGetIntegerv(GL_UNPACK_SWAP_BYTES, &swapbytes); 263 glGetIntegerv(GL_UNPACK_LSB_FIRST, &lsbfirst); 264 glGetIntegerv(GL_UNPACK_ROW_LENGTH, &rowlength); 265 glGetIntegerv(GL_UNPACK_SKIP_ROWS, &skiprows); 266 glGetIntegerv(GL_UNPACK_SKIP_PIXELS, &skippixels); 267 glGetIntegerv(GL_UNPACK_ALIGNMENT, &alignment); 268 269 /* Enforce a standard packing mode which is compatible with 270 fill_bitmap() from above. This is actually the default mode, 271 except for the (non)alignment. */ 272 glPixelStorei(GL_UNPACK_SWAP_BYTES, GL_FALSE); 273 glPixelStorei(GL_UNPACK_LSB_FIRST, GL_FALSE); 274 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0); 275 glPixelStorei(GL_UNPACK_SKIP_ROWS, 0); 276 glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0); 277 glPixelStorei(GL_UNPACK_ALIGNMENT, 1); 278 279 pixmap = XCreatePixmap(dpy, win, 10, 10, 1); 280 values.foreground = BlackPixel(dpy, DefaultScreen(dpy)); 281 values.background = WhitePixel(dpy, DefaultScreen(dpy)); 282 values.font = fs->fid; 283 valuemask = GCForeground | GCBackground | GCFont; 284 gc = XCreateGC(dpy, pixmap, valuemask, &values); 285 XFreePixmap(dpy, pixmap); 286 287 #ifdef DEBUG 288 if (debug_xfonts) 289 dump_font_struct(fs); 290 #endif 291 292 for (i = 0; i < count; i++) { 293 unsigned int width, height, bm_width, bm_height; 294 GLfloat x0, y0, dx, dy; 295 XCharStruct *ch; 296 int x, y; 297 unsigned int c = first + i; 298 int list = listbase + i; 299 int valid; 300 301 /* check on index validity and get the bounds */ 302 ch = isvalid(fs, c); 303 if (!ch) { 304 ch = &fs->max_bounds; 305 valid = 0; 306 } 307 else { 308 valid = 1; 309 } 310 311 #ifdef DEBUG 312 if (debug_xfonts) { 313 char s[7]; 314 sprintf(s, isprint(c) ? "%c> " : "\\%03o> ", c); 315 dump_char_struct(ch, s); 316 } 317 #endif 318 319 /* glBitmap()' parameters: 320 straight from the glXUseXFont(3) manpage. */ 321 width = ch->rbearing - ch->lbearing; 322 height = ch->ascent + ch->descent; 323 x0 = -ch->lbearing; 324 y0 = ch->descent - 0; /* XXX used to subtract 1 here */ 325 /* but that caused a conformace failure */ 326 dx = ch->width; 327 dy = 0; 328 329 /* X11's starting point. */ 330 x = -ch->lbearing; 331 y = ch->ascent; 332 333 /* Round the width to a multiple of eight. We will use this also 334 for the pixmap for capturing the X11 font. This is slightly 335 inefficient, but it makes the OpenGL part real easy. */ 336 bm_width = (width + 7) / 8; 337 bm_height = height; 338 339 glNewList(list, GL_COMPILE); 340 if (valid && (bm_width > 0) && (bm_height > 0)) { 341 342 memset(bm, '\0', bm_width * bm_height); 343 fill_bitmap(dpy, win, gc, bm_width, bm_height, x, y, c, bm); 344 345 glBitmap(width, height, x0, y0, dx, dy, bm); 346 #ifdef DEBUG 347 if (debug_xfonts) { 348 printf("width/height = %u/%u\n", width, height); 349 printf("bm_width/bm_height = %u/%u\n", bm_width, bm_height); 350 dump_bitmap(bm_width, bm_height, bm); 351 } 352 #endif 353 } 354 else { 355 glBitmap(0, 0, 0.0, 0.0, dx, dy, NULL); 356 } 357 glEndList(); 358 } 359 360 FREE(bm); 361 XFreeFontInfo(NULL, fs, 1); 362 XFreeGC(dpy, gc); 363 364 /* Restore saved packing modes. */ 365 glPixelStorei(GL_UNPACK_SWAP_BYTES, swapbytes); 366 glPixelStorei(GL_UNPACK_LSB_FIRST, lsbfirst); 367 glPixelStorei(GL_UNPACK_ROW_LENGTH, rowlength); 368 glPixelStorei(GL_UNPACK_SKIP_ROWS, skiprows); 369 glPixelStorei(GL_UNPACK_SKIP_PIXELS, skippixels); 370 glPixelStorei(GL_UNPACK_ALIGNMENT, alignment); 371 } 372
