libdrawtext

annotate src/font.c @ 21:c750059a1258

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font2glyphmap tool
author John Tsiombikas <nuclear@member.fsf.org>
date Tue, 15 Apr 2014 03:33:39 +0300
parents b6ed6e9b4092
children df6d52b36bd6
rev   line source
nuclear@5 1 /*
nuclear@5 2 libdrawtext - a simple library for fast text rendering in OpenGL
nuclear@5 3 Copyright (C) 2011 John Tsiombikas <nuclear@member.fsf.org>
nuclear@5 4
nuclear@5 5 This program is free software: you can redistribute it and/or modify
nuclear@5 6 it under the terms of the GNU Lesser General Public License as published by
nuclear@5 7 the Free Software Foundation, either version 3 of the License, or
nuclear@5 8 (at your option) any later version.
nuclear@5 9
nuclear@5 10 This program is distributed in the hope that it will be useful,
nuclear@5 11 but WITHOUT ANY WARRANTY; without even the implied warranty of
nuclear@5 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
nuclear@5 13 GNU Lesser General Public License for more details.
nuclear@5 14
nuclear@5 15 You should have received a copy of the GNU Lesser General Public License
nuclear@5 16 along with this program. If not, see <http://www.gnu.org/licenses/>.
nuclear@5 17 */
nuclear@0 18 #ifndef NO_FREETYPE
nuclear@0 19 #define USE_FREETYPE
nuclear@0 20 #endif
nuclear@0 21
nuclear@0 22 #include <stdio.h>
nuclear@0 23 #include <stdlib.h>
nuclear@0 24 #include <string.h>
nuclear@6 25 #include <math.h>
nuclear@0 26 #include <limits.h>
nuclear@0 27 #include <ctype.h>
nuclear@6 28 #include <float.h>
nuclear@0 29 #include <errno.h>
nuclear@0 30 #ifdef USE_FREETYPE
nuclear@0 31 #include <ft2build.h>
nuclear@0 32 #include FT_FREETYPE_H
nuclear@0 33 #endif
nuclear@0 34 #include "drawtext.h"
nuclear@0 35 #include "drawtext_impl.h"
nuclear@0 36
nuclear@0 37 #define FTSZ_TO_PIXELS(x) ((x) / 64)
nuclear@0 38 #define MAX_IMG_WIDTH 4096
nuclear@0 39
nuclear@0 40
nuclear@0 41 #ifdef USE_FREETYPE
nuclear@0 42 static int init_freetype(void);
nuclear@0 43 static void cleanup(void);
nuclear@0 44
nuclear@0 45 static void calc_best_size(int total_width, int max_glyph_height, int padding, int pow2, int *imgw, int *imgh);
nuclear@0 46 static int next_pow2(int x);
nuclear@0 47
nuclear@0 48 static FT_Library ft;
nuclear@0 49
nuclear@0 50
nuclear@0 51 static int init_done;
nuclear@0 52
nuclear@0 53 static int init_freetype(void)
nuclear@0 54 {
nuclear@0 55 if(!init_done) {
nuclear@0 56 if(FT_Init_FreeType(&ft) != 0) {
nuclear@0 57 return -1;
nuclear@0 58 }
nuclear@0 59 atexit(cleanup);
nuclear@0 60 init_done = 1;
nuclear@0 61 }
nuclear@0 62 return 0;
nuclear@0 63 }
nuclear@0 64
nuclear@0 65 static void cleanup(void)
nuclear@0 66 {
nuclear@0 67 if(init_done) {
nuclear@0 68 FT_Done_FreeType(ft);
nuclear@0 69 }
nuclear@0 70 }
nuclear@0 71
nuclear@0 72 struct dtx_font *dtx_open_font(const char *fname, int sz)
nuclear@0 73 {
nuclear@0 74 struct dtx_font *fnt;
nuclear@0 75
nuclear@0 76 init_freetype();
nuclear@0 77
nuclear@0 78 if(!(fnt = calloc(1, sizeof *fnt))) {
nuclear@0 79 fperror("failed to allocate font structure");
nuclear@0 80 return 0;
nuclear@0 81 }
nuclear@0 82
nuclear@0 83 if(FT_New_Face(ft, fname, 0, (FT_Face*)&fnt->face) != 0) {
nuclear@0 84 fprintf(stderr, "failed to open font file: %s\n", fname);
nuclear@0 85 return 0;
nuclear@0 86 }
nuclear@0 87
nuclear@0 88 /* pre-create the extended ASCII range glyphmap */
nuclear@0 89 if(sz) {
nuclear@0 90 dtx_prepare_range(fnt, sz, 0, 256);
nuclear@14 91
nuclear@14 92 if(!dtx_font) {
nuclear@14 93 dtx_use_font(fnt, sz);
nuclear@14 94 }
nuclear@0 95 }
nuclear@0 96
nuclear@0 97 return fnt;
nuclear@0 98 }
nuclear@0 99
nuclear@0 100 void dtx_close_font(struct dtx_font *fnt)
nuclear@0 101 {
nuclear@0 102 if(!fnt) return;
nuclear@0 103
nuclear@0 104 FT_Done_Face(fnt->face);
nuclear@0 105
nuclear@0 106 /* destroy the glyphmaps */
nuclear@0 107 while(fnt->gmaps) {
nuclear@0 108 void *tmp = fnt->gmaps;
nuclear@0 109 fnt->gmaps = fnt->gmaps->next;
nuclear@0 110 dtx_free_glyphmap(tmp);
nuclear@0 111 }
nuclear@0 112
nuclear@0 113 free(fnt);
nuclear@0 114 }
nuclear@0 115
nuclear@0 116 void dtx_prepare(struct dtx_font *fnt, int sz)
nuclear@0 117 {
nuclear@0 118 dtx_get_font_glyphmap_range(fnt, sz, 0, 256);
nuclear@0 119 }
nuclear@0 120
nuclear@0 121 void dtx_prepare_range(struct dtx_font *fnt, int sz, int cstart, int cend)
nuclear@0 122 {
nuclear@0 123 dtx_get_font_glyphmap_range(fnt, sz, cstart, cend);
nuclear@0 124 }
nuclear@0 125
nuclear@0 126 struct dtx_glyphmap *dtx_get_font_glyphmap(struct dtx_font *fnt, int sz, int code)
nuclear@0 127 {
nuclear@0 128 struct dtx_glyphmap *gm;
nuclear@0 129
nuclear@0 130 /* check to see if the last we've given out fits the bill */
nuclear@0 131 if(fnt->last_gmap && code >= fnt->last_gmap->cstart && code < fnt->last_gmap->cend && fnt->last_gmap->ptsize == sz) {
nuclear@0 132 return fnt->last_gmap;
nuclear@0 133 }
nuclear@0 134
nuclear@0 135 /* otherwise search for the appropriate glyphmap */
nuclear@0 136 gm = fnt->gmaps;
nuclear@0 137 while(gm) {
nuclear@0 138 if(code >= gm->cstart && code < gm->cend && sz == gm->ptsize) {
nuclear@0 139 fnt->last_gmap = gm;
nuclear@0 140 return gm;
nuclear@0 141 }
nuclear@0 142 gm = gm->next;
nuclear@0 143 }
nuclear@0 144 return 0;
nuclear@0 145 }
nuclear@0 146
nuclear@0 147 struct dtx_glyphmap *dtx_get_font_glyphmap_range(struct dtx_font *fnt, int sz, int cstart, int cend)
nuclear@0 148 {
nuclear@0 149 struct dtx_glyphmap *gm;
nuclear@0 150
nuclear@0 151 /* search the available glyphmaps to see if we've got one that includes
nuclear@0 152 * the requested range
nuclear@0 153 */
nuclear@0 154 gm = fnt->gmaps;
nuclear@0 155 while(gm) {
nuclear@0 156 if(gm->cstart <= cstart && gm->cend >= cend && gm->ptsize == sz) {
nuclear@0 157 return gm;
nuclear@0 158 }
nuclear@0 159 gm = gm->next;
nuclear@0 160 }
nuclear@0 161
nuclear@0 162 /* not found, create one and add it to the list */
nuclear@0 163 if(!(gm = dtx_create_glyphmap_range(fnt, sz, cstart, cend))) {
nuclear@0 164 return 0;
nuclear@0 165 }
nuclear@0 166 return gm;
nuclear@0 167 }
nuclear@0 168
nuclear@0 169 struct dtx_glyphmap *dtx_create_glyphmap_range(struct dtx_font *fnt, int sz, int cstart, int cend)
nuclear@0 170 {
nuclear@0 171 FT_Face face = fnt->face;
nuclear@0 172 struct dtx_glyphmap *gmap;
nuclear@0 173 int i, j;
nuclear@0 174 int gx, gy;
nuclear@0 175 int padding = 4;
nuclear@0 176 int total_width = padding;
nuclear@0 177 int max_height = 0;
nuclear@0 178
nuclear@0 179 FT_Set_Char_Size(fnt->face, 0, sz * 64, 72, 72);
nuclear@0 180
nuclear@3 181 if(!(gmap = calloc(1, sizeof *gmap))) {
nuclear@0 182 return 0;
nuclear@0 183 }
nuclear@0 184
nuclear@0 185 gmap->ptsize = sz;
nuclear@0 186 gmap->cstart = cstart;
nuclear@0 187 gmap->cend = cend;
nuclear@0 188 gmap->crange = cend - cstart;
nuclear@0 189 gmap->line_advance = FTSZ_TO_PIXELS((float)face->size->metrics.height);
nuclear@0 190
nuclear@0 191 if(!(gmap->glyphs = malloc(gmap->crange * sizeof *gmap->glyphs))) {
nuclear@0 192 free(gmap);
nuclear@0 193 return 0;
nuclear@0 194 }
nuclear@0 195
nuclear@0 196 for(i=0; i<gmap->crange; i++) {
nuclear@0 197 int h;
nuclear@0 198
nuclear@0 199 FT_Load_Char(face, i + cstart, 0);
nuclear@0 200 h = FTSZ_TO_PIXELS(face->glyph->metrics.height);
nuclear@0 201
nuclear@0 202 if(h > max_height) {
nuclear@0 203 max_height = h;
nuclear@0 204 }
nuclear@0 205 total_width += FTSZ_TO_PIXELS(face->glyph->metrics.width) + padding;
nuclear@0 206 }
nuclear@0 207
nuclear@0 208 calc_best_size(total_width, max_height, padding, 1, &gmap->xsz, &gmap->ysz);
nuclear@0 209
nuclear@0 210 if(!(gmap->pixels = malloc(gmap->xsz * gmap->ysz))) {
nuclear@0 211 free(gmap->glyphs);
nuclear@0 212 free(gmap);
nuclear@0 213 return 0;
nuclear@0 214 }
nuclear@0 215 memset(gmap->pixels, 0, gmap->xsz * gmap->ysz);
nuclear@0 216
nuclear@0 217 gx = padding;
nuclear@0 218 gy = padding;
nuclear@0 219
nuclear@0 220 for(i=0; i<gmap->crange; i++) {
nuclear@0 221 float gwidth, gheight;
nuclear@0 222 unsigned char *src, *dst;
nuclear@0 223 FT_GlyphSlot glyph;
nuclear@0 224
nuclear@0 225 FT_Load_Char(face, i + cstart, FT_LOAD_RENDER);
nuclear@0 226 glyph = face->glyph;
nuclear@0 227 gwidth = FTSZ_TO_PIXELS((float)glyph->metrics.width);
nuclear@0 228 gheight = FTSZ_TO_PIXELS((float)glyph->metrics.height);
nuclear@0 229
nuclear@0 230 if(gx > gmap->xsz - gwidth - padding) {
nuclear@0 231 gx = padding;
nuclear@0 232 gy += max_height + padding;
nuclear@0 233 }
nuclear@0 234
nuclear@0 235 src = glyph->bitmap.buffer;
nuclear@0 236 dst = gmap->pixels + gy * gmap->xsz + gx;
nuclear@0 237
nuclear@0 238 for(j=0; j<glyph->bitmap.rows; j++) {
nuclear@0 239 memcpy(dst, src, glyph->bitmap.width);
nuclear@0 240 dst += gmap->xsz;
nuclear@0 241 src += glyph->bitmap.pitch;
nuclear@0 242 }
nuclear@0 243
nuclear@0 244 gmap->glyphs[i].code = i;
nuclear@0 245 gmap->glyphs[i].x = gx - 1;
nuclear@0 246 gmap->glyphs[i].y = gy - 1;
nuclear@0 247 gmap->glyphs[i].width = gwidth + 2;
nuclear@0 248 gmap->glyphs[i].height = gheight + 2;
nuclear@0 249 gmap->glyphs[i].orig_x = -FTSZ_TO_PIXELS((float)glyph->metrics.horiBearingX) + 1;
nuclear@0 250 gmap->glyphs[i].orig_y = FTSZ_TO_PIXELS((float)glyph->metrics.height - glyph->metrics.horiBearingY) + 1;
nuclear@0 251 gmap->glyphs[i].advance = FTSZ_TO_PIXELS((float)glyph->metrics.horiAdvance);
nuclear@0 252 /* also precalc normalized */
nuclear@0 253 gmap->glyphs[i].nx = (float)gmap->glyphs[i].x / (float)gmap->xsz;
nuclear@0 254 gmap->glyphs[i].ny = (float)gmap->glyphs[i].y / (float)gmap->ysz;
nuclear@0 255 gmap->glyphs[i].nwidth = (float)gmap->glyphs[i].width / (float)gmap->xsz;
nuclear@0 256 gmap->glyphs[i].nheight = (float)gmap->glyphs[i].height / (float)gmap->ysz;
nuclear@0 257
nuclear@0 258 gx += gwidth + padding;
nuclear@0 259 }
nuclear@0 260
nuclear@0 261 /* add it to the glyphmaps list of the font */
nuclear@0 262 gmap->next = fnt->gmaps;
nuclear@0 263 fnt->gmaps = gmap;
nuclear@0 264
nuclear@0 265 return gmap;
nuclear@0 266 }
nuclear@0 267 #endif /* USE_FREETYPE */
nuclear@0 268
nuclear@0 269 void dtx_free_glyphmap(struct dtx_glyphmap *gmap)
nuclear@0 270 {
nuclear@0 271 if(gmap) {
nuclear@0 272 free(gmap->pixels);
nuclear@0 273 free(gmap->glyphs);
nuclear@0 274 free(gmap);
nuclear@0 275 }
nuclear@0 276 }
nuclear@0 277
nuclear@0 278 unsigned char *dtx_get_glyphmap_pixels(struct dtx_glyphmap *gmap)
nuclear@0 279 {
nuclear@0 280 return gmap->pixels;
nuclear@0 281 }
nuclear@0 282
nuclear@0 283 int dtx_get_glyphmap_width(struct dtx_glyphmap *gmap)
nuclear@0 284 {
nuclear@0 285 return gmap->xsz;
nuclear@0 286 }
nuclear@0 287
nuclear@0 288 int dtx_get_glyphmap_height(struct dtx_glyphmap *gmap)
nuclear@0 289 {
nuclear@0 290 return gmap->ysz;
nuclear@0 291 }
nuclear@0 292
nuclear@0 293 struct dtx_glyphmap *dtx_load_glyphmap(const char *fname)
nuclear@0 294 {
nuclear@0 295 FILE *fp;
nuclear@0 296 struct dtx_glyphmap *gmap;
nuclear@0 297
nuclear@0 298 if(!(fp = fopen(fname, "r"))) {
nuclear@0 299 return 0;
nuclear@0 300 }
nuclear@0 301 gmap = dtx_load_glyphmap_stream(fp);
nuclear@0 302 fclose(fp);
nuclear@0 303 return gmap;
nuclear@0 304 }
nuclear@0 305
nuclear@0 306 struct dtx_glyphmap *dtx_load_glyphmap_stream(FILE *fp)
nuclear@0 307 {
nuclear@0 308 char buf[512];
nuclear@0 309 int hdr_lines = 0;
nuclear@0 310 struct dtx_glyphmap *gmap;
nuclear@0 311 struct glyph *glyphs = 0;
nuclear@0 312 int min_code = INT_MAX;
nuclear@0 313 int max_code = INT_MIN;
nuclear@0 314 int i, max_pixval, num_pixels;
nuclear@0 315
nuclear@0 316 if(!(gmap = calloc(1, sizeof *gmap))) {
nuclear@0 317 fperror("failed to allocate glyphmap");
nuclear@0 318 return 0;
nuclear@0 319 }
nuclear@0 320
nuclear@0 321 while(hdr_lines < 3) {
nuclear@0 322 char *line = buf;
nuclear@0 323 if(!fgets(buf, sizeof buf, fp)) {
nuclear@0 324 fperror("unexpected end of file");
nuclear@0 325 goto err;
nuclear@0 326 }
nuclear@0 327
nuclear@0 328 while(isspace(*line)) {
nuclear@0 329 line++;
nuclear@0 330 }
nuclear@0 331
nuclear@0 332 if(line[0] == '#') {
nuclear@0 333 struct glyph *g;
nuclear@16 334 int c, res;
nuclear@16 335 float x, y, xsz, ysz;
nuclear@0 336
nuclear@0 337 res = sscanf(line + 1, "%d: %fx%f+%f+%f\n", &c, &xsz, &ysz, &x, &y);
nuclear@0 338 if(res != 5) {
nuclear@16 339 fprintf(stderr, "%s: invalid glyph info line\n", __FUNCTION__);
nuclear@0 340 goto err;
nuclear@0 341 }
nuclear@0 342
nuclear@0 343 if(!(g = malloc(sizeof *g))) {
nuclear@0 344 fperror("failed to allocate glyph");
nuclear@0 345 goto err;
nuclear@0 346 }
nuclear@0 347 g->code = c;
nuclear@0 348 g->x = x;
nuclear@0 349 g->y = y;
nuclear@0 350 g->width = xsz;
nuclear@0 351 g->height = ysz;
nuclear@0 352 g->next = glyphs;
nuclear@0 353 glyphs = g;
nuclear@0 354
nuclear@0 355 if(c < min_code) {
nuclear@0 356 min_code = c;
nuclear@0 357 }
nuclear@0 358 if(c > max_code) {
nuclear@0 359 max_code = c;
nuclear@0 360 }
nuclear@0 361 } else {
nuclear@0 362 switch(hdr_lines) {
nuclear@0 363 case 0:
nuclear@0 364 if(0[line] != 'P' || 1[line] != '6') {
nuclear@16 365 fprintf(stderr, "%s: invalid file format (magic)\n", __FUNCTION__);
nuclear@0 366 goto err;
nuclear@0 367 }
nuclear@0 368 break;
nuclear@0 369
nuclear@0 370 case 1:
nuclear@0 371 if(sscanf(line, "%d %d", &gmap->xsz, &gmap->ysz) != 2) {
nuclear@16 372 fprintf(stderr, "%s: invalid file format (dim)\n", __FUNCTION__);
nuclear@0 373 goto err;
nuclear@0 374 }
nuclear@0 375 break;
nuclear@0 376
nuclear@0 377 case 2:
nuclear@0 378 {
nuclear@0 379 char *endp;
nuclear@0 380 max_pixval = strtol(line, &endp, 10);
nuclear@0 381 if(endp == line) {
nuclear@16 382 fprintf(stderr, "%s: invalid file format (maxval)\n", __FUNCTION__);
nuclear@0 383 goto err;
nuclear@0 384 }
nuclear@0 385 }
nuclear@0 386 break;
nuclear@0 387
nuclear@0 388 default:
nuclear@0 389 break; /* can't happen */
nuclear@0 390 }
nuclear@0 391 hdr_lines++;
nuclear@0 392 }
nuclear@0 393 }
nuclear@0 394
nuclear@0 395 num_pixels = gmap->xsz * gmap->ysz;
nuclear@0 396 if(!(gmap->pixels = malloc(num_pixels))) {
nuclear@0 397 fperror("failed to allocate pixels");
nuclear@0 398 goto err;
nuclear@0 399 }
nuclear@0 400
nuclear@0 401 for(i=0; i<num_pixels; i++) {
nuclear@0 402 long c = fgetc(fp);
nuclear@0 403 if(c == -1) {
nuclear@0 404 fprintf(stderr, "unexpected end of file while reading pixels\n");
nuclear@0 405 goto err;
nuclear@0 406 }
nuclear@0 407 gmap->pixels[i] = 255 * c / max_pixval;
nuclear@0 408 fseek(fp, 2, SEEK_CUR);
nuclear@0 409 }
nuclear@0 410
nuclear@0 411 gmap->cstart = min_code;
nuclear@0 412 gmap->cend = max_code + 1;
nuclear@0 413 gmap->crange = gmap->cend - gmap->cstart;
nuclear@0 414
nuclear@0 415 if(!(gmap->glyphs = calloc(gmap->crange, sizeof *gmap->glyphs))) {
nuclear@0 416 fperror("failed to allocate glyph info");
nuclear@0 417 goto err;
nuclear@0 418 }
nuclear@0 419
nuclear@0 420 while(glyphs) {
nuclear@0 421 struct glyph *g = glyphs;
nuclear@0 422 glyphs = glyphs->next;
nuclear@0 423
nuclear@0 424 gmap->glyphs[g->code - gmap->cstart] = *g;
nuclear@0 425 free(g);
nuclear@0 426 }
nuclear@0 427 return gmap;
nuclear@0 428
nuclear@0 429 err:
nuclear@0 430 dtx_free_glyphmap(gmap);
nuclear@0 431 while(glyphs) {
nuclear@0 432 void *tmp = glyphs;
nuclear@0 433 glyphs = glyphs->next;
nuclear@0 434 free(tmp);
nuclear@0 435 }
nuclear@0 436 return 0;
nuclear@0 437 }
nuclear@0 438
nuclear@0 439 int dtx_save_glyphmap(const char *fname, const struct dtx_glyphmap *gmap)
nuclear@0 440 {
nuclear@0 441 FILE *fp;
nuclear@0 442 int res;
nuclear@0 443
nuclear@0 444 if(!(fp = fopen(fname, "wb"))) {
nuclear@16 445 fprintf(stderr, "%s: failed to open file: %s: %s\n", __FUNCTION__, fname, strerror(errno));
nuclear@0 446 return -1;
nuclear@0 447 }
nuclear@0 448 res = dtx_save_glyphmap_stream(fp, gmap);
nuclear@0 449 fclose(fp);
nuclear@0 450 return res;
nuclear@0 451 }
nuclear@0 452
nuclear@0 453 int dtx_save_glyphmap_stream(FILE *fp, const struct dtx_glyphmap *gmap)
nuclear@0 454 {
nuclear@0 455 int i, num_pixels;
nuclear@0 456 struct glyph *g = gmap->glyphs;
nuclear@0 457
nuclear@0 458 fprintf(fp, "P6\n%d %d\n", gmap->xsz, gmap->ysz);
nuclear@0 459 for(i=0; i<gmap->crange; i++) {
nuclear@0 460 fprintf(fp, "# %d: %fx%f+%f+%f\n", g->code, g->width, g->height, g->x, g->y);
nuclear@0 461 g++;
nuclear@0 462 }
nuclear@0 463 fprintf(fp, "255\n");
nuclear@0 464
nuclear@0 465 num_pixels = gmap->xsz * gmap->ysz;
nuclear@0 466 for(i=0; i<num_pixels; i++) {
nuclear@0 467 int c = gmap->pixels[i];
nuclear@0 468 fputc(c, fp);
nuclear@0 469 fputc(c, fp);
nuclear@0 470 fputc(c, fp);
nuclear@0 471 }
nuclear@0 472 return 0;
nuclear@0 473 }
nuclear@0 474
nuclear@0 475
nuclear@6 476 void dtx_use_font(struct dtx_font *fnt, int sz)
nuclear@6 477 {
nuclear@6 478 dtx_gl_init();
nuclear@6 479
nuclear@6 480 dtx_font = fnt;
nuclear@6 481 dtx_font_sz = sz;
nuclear@6 482 }
nuclear@6 483
nuclear@13 484 float dtx_line_height(void)
nuclear@13 485 {
nuclear@13 486 struct dtx_glyphmap *gmap = dtx_get_font_glyphmap(dtx_font, dtx_font_sz, '\n');
nuclear@13 487
nuclear@13 488 return gmap->line_advance;
nuclear@13 489 }
nuclear@13 490
nuclear@6 491 void dtx_glyph_box(int code, struct dtx_box *box)
nuclear@6 492 {
nuclear@6 493 int cidx;
nuclear@6 494 struct dtx_glyphmap *gmap;
nuclear@6 495 gmap = dtx_get_font_glyphmap(dtx_font, dtx_font_sz, code);
nuclear@6 496
nuclear@6 497 cidx = code - gmap->cstart;
nuclear@6 498
nuclear@6 499 box->x = gmap->glyphs[cidx].orig_x;
nuclear@6 500 box->y = gmap->glyphs[cidx].orig_y;
nuclear@6 501 box->width = gmap->glyphs[cidx].width;
nuclear@6 502 box->height = gmap->glyphs[cidx].height;
nuclear@6 503 }
nuclear@6 504
nuclear@6 505 float dtx_glyph_width(int code)
nuclear@6 506 {
nuclear@6 507 struct dtx_box box;
nuclear@6 508 dtx_glyph_box(code, &box);
nuclear@6 509 return box.width;
nuclear@6 510 }
nuclear@6 511
nuclear@6 512 float dtx_glyph_height(int code)
nuclear@6 513 {
nuclear@6 514 struct dtx_box box;
nuclear@6 515 dtx_glyph_box(code, &box);
nuclear@6 516 return box.height;
nuclear@6 517 }
nuclear@6 518
nuclear@6 519 void dtx_string_box(const char *str, struct dtx_box *box)
nuclear@6 520 {
nuclear@6 521 int code;
nuclear@6 522 float pos_x = 0.0f, pos_y = 0.0f;
nuclear@6 523 struct glyph *g = 0;
nuclear@6 524 float x0, y0, x1, y1;
nuclear@6 525
nuclear@6 526 x0 = y0 = FLT_MAX;
nuclear@6 527 x1 = y1 = -FLT_MAX;
nuclear@6 528
nuclear@6 529 while(*str) {
nuclear@6 530 float px, py;
nuclear@6 531 struct dtx_glyphmap *gmap;
nuclear@6 532
nuclear@6 533 code = dtx_utf8_char_code(str);
nuclear@6 534 str = dtx_utf8_next_char((char*)str);
nuclear@6 535
nuclear@6 536 px = pos_x;
nuclear@6 537 py = pos_y;
nuclear@6 538
nuclear@6 539 if((gmap = dtx_proc_char(code, &pos_x, &pos_y))) {
nuclear@6 540 g = gmap->glyphs + code - gmap->cstart;
nuclear@6 541
nuclear@6 542 if(px + g->orig_x < x0) {
nuclear@6 543 x0 = px + g->orig_x;
nuclear@6 544 }
nuclear@7 545 if(py - g->orig_y < y0) {
nuclear@7 546 y0 = py - g->orig_y;
nuclear@6 547 }
nuclear@6 548 if(px + g->orig_x + g->width > x1) {
nuclear@6 549 x1 = px + g->orig_x + g->width;
nuclear@6 550 }
nuclear@7 551 if(py - g->orig_y + g->height > y1) {
nuclear@7 552 y1 = py - g->orig_y + g->height;
nuclear@6 553 }
nuclear@6 554 }
nuclear@6 555 }
nuclear@6 556
nuclear@6 557 box->x = x0;
nuclear@6 558 box->y = y0;
nuclear@6 559 box->width = x1 - x0;
nuclear@6 560 box->height = y1 - y0;
nuclear@6 561 }
nuclear@6 562
nuclear@6 563 float dtx_string_width(const char *str)
nuclear@6 564 {
nuclear@6 565 struct dtx_box box;
nuclear@6 566
nuclear@6 567 dtx_string_box(str, &box);
nuclear@6 568 return box.width;
nuclear@6 569 }
nuclear@6 570
nuclear@6 571 float dtx_string_height(const char *str)
nuclear@6 572 {
nuclear@6 573 struct dtx_box box;
nuclear@6 574
nuclear@6 575 dtx_string_box(str, &box);
nuclear@6 576 return box.height;
nuclear@6 577 }
nuclear@6 578
nuclear@6 579 float dtx_char_pos(const char *str, int n)
nuclear@6 580 {
nuclear@6 581 int i;
nuclear@6 582 float pos = 0.0;
nuclear@6 583 struct dtx_glyphmap *gmap;
nuclear@6 584
nuclear@6 585 for(i=0; i<n; i++) {
nuclear@6 586 int code = dtx_utf8_char_code(str);
nuclear@6 587 str = dtx_utf8_next_char((char*)str);
nuclear@6 588
nuclear@6 589 gmap = dtx_get_font_glyphmap(dtx_font, dtx_font_sz, code);
nuclear@6 590 pos += gmap->glyphs[i].advance;
nuclear@6 591 }
nuclear@6 592 return pos;
nuclear@6 593 }
nuclear@6 594
nuclear@7 595 int dtx_char_at_pt(const char *str, float pt)
nuclear@7 596 {
nuclear@7 597 int i;
nuclear@7 598 float prev_pos = 0.0f, pos = 0.0f;
nuclear@7 599 struct dtx_glyphmap *gmap;
nuclear@7 600
nuclear@7 601 for(i=0; *str; i++) {
nuclear@7 602 int code = dtx_utf8_char_code(str);
nuclear@7 603 str = dtx_utf8_next_char((char*)str);
nuclear@7 604
nuclear@7 605 gmap = dtx_get_font_glyphmap(dtx_font, dtx_font_sz, code);
nuclear@7 606 pos += gmap->glyphs[i].advance;
nuclear@7 607
nuclear@7 608 if(fabs(pt - prev_pos) < fabs(pt - pos)) {
nuclear@7 609 break;
nuclear@7 610 }
nuclear@7 611 prev_pos = pos;
nuclear@7 612 }
nuclear@7 613 return i;
nuclear@7 614 }
nuclear@6 615
nuclear@6 616 struct dtx_glyphmap *dtx_proc_char(int code, float *xpos, float *ypos)
nuclear@6 617 {
nuclear@6 618 struct dtx_glyphmap *gmap;
nuclear@6 619 gmap = dtx_get_font_glyphmap(dtx_font, dtx_font_sz, code);
nuclear@6 620
nuclear@6 621 switch(code) {
nuclear@6 622 case '\n':
nuclear@6 623 *xpos = 0.0;
nuclear@6 624 if(gmap) {
nuclear@6 625 *ypos -= gmap->line_advance;
nuclear@6 626 }
nuclear@6 627 return 0;
nuclear@6 628
nuclear@6 629 case '\t':
nuclear@6 630 if(gmap) {
nuclear@6 631 *xpos = (fmod(*xpos, 4.0) + 4.0) * gmap->glyphs[0].advance;
nuclear@6 632 }
nuclear@6 633 return 0;
nuclear@6 634
nuclear@6 635 case '\r':
nuclear@6 636 *xpos = 0.0;
nuclear@6 637 return 0;
nuclear@6 638
nuclear@6 639 default:
nuclear@6 640 break;
nuclear@6 641 }
nuclear@6 642
nuclear@6 643 if(gmap) {
nuclear@6 644 *xpos += gmap->glyphs[code - gmap->cstart].advance;
nuclear@6 645 }
nuclear@6 646 return gmap;
nuclear@6 647 }
nuclear@6 648
nuclear@0 649 static void calc_best_size(int total_width, int max_glyph_height, int padding, int pow2, int *imgw, int *imgh)
nuclear@0 650 {
nuclear@0 651 int xsz, ysz, num_rows;
nuclear@0 652 float aspect;
nuclear@0 653
nuclear@0 654 for(xsz=2; xsz<=MAX_IMG_WIDTH; xsz *= 2) {
nuclear@0 655 num_rows = total_width / xsz + 1;
nuclear@0 656
nuclear@0 657 /* take into account the one extra padding for each row after the first */
nuclear@0 658 num_rows = (total_width + padding * (num_rows - 1)) / xsz + 1;
nuclear@0 659
nuclear@0 660 ysz = num_rows * (max_glyph_height + padding) + padding;
nuclear@0 661 if(pow2) {
nuclear@0 662 ysz = next_pow2(ysz);
nuclear@0 663 }
nuclear@0 664 aspect = (float)xsz / (float)ysz;
nuclear@0 665
nuclear@0 666 if(aspect >= 1.0) {
nuclear@0 667 break;
nuclear@0 668 }
nuclear@0 669 }
nuclear@0 670
nuclear@0 671 if(xsz > MAX_IMG_WIDTH) {
nuclear@0 672 xsz = MAX_IMG_WIDTH;
nuclear@0 673 }
nuclear@0 674
nuclear@0 675 *imgw = xsz;
nuclear@0 676 *imgh = ysz;
nuclear@0 677 }
nuclear@0 678
nuclear@0 679
nuclear@0 680 static int next_pow2(int x)
nuclear@0 681 {
nuclear@0 682 x--;
nuclear@0 683 x = (x >> 1) | x;
nuclear@0 684 x = (x >> 2) | x;
nuclear@0 685 x = (x >> 4) | x;
nuclear@0 686 x = (x >> 8) | x;
nuclear@0 687 x = (x >> 16) | x;
nuclear@0 688 return x + 1;
nuclear@0 689 }