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annotate libs/drawtext/font.c @ 10:c71c477521ca

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converting to GLES2 and C++
author John Tsiombikas <nuclear@member.fsf.org>
date Sun, 31 May 2015 00:40:26 +0300
parents
children d7fe157c402d
rev   line source
nuclear@10 1 /*
nuclear@10 2 libdrawtext - a simple library for fast text rendering in OpenGL
nuclear@10 3 Copyright (C) 2011-2014 John Tsiombikas <nuclear@member.fsf.org>
nuclear@10 4
nuclear@10 5 This program is free software: you can redistribute it and/or modify
nuclear@10 6 it under the terms of the GNU Lesser General Public License as published by
nuclear@10 7 the Free Software Foundation, either version 3 of the License, or
nuclear@10 8 (at your option) any later version.
nuclear@10 9
nuclear@10 10 This program is distributed in the hope that it will be useful,
nuclear@10 11 but WITHOUT ANY WARRANTY; without even the implied warranty of
nuclear@10 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
nuclear@10 13 GNU Lesser General Public License for more details.
nuclear@10 14
nuclear@10 15 You should have received a copy of the GNU Lesser General Public License
nuclear@10 16 along with this program. If not, see <http://www.gnu.org/licenses/>.
nuclear@10 17 */
nuclear@10 18 #ifndef NO_FREETYPE
nuclear@10 19 #define USE_FREETYPE
nuclear@10 20 #endif
nuclear@10 21
nuclear@10 22 #include <stdio.h>
nuclear@10 23 #include <stdlib.h>
nuclear@10 24 #include <string.h>
nuclear@10 25 #include <math.h>
nuclear@10 26 #include <limits.h>
nuclear@10 27 #include <ctype.h>
nuclear@10 28 #include <float.h>
nuclear@10 29 #include <errno.h>
nuclear@10 30 #ifdef USE_FREETYPE
nuclear@10 31 #include <ft2build.h>
nuclear@10 32 #include FT_FREETYPE_H
nuclear@10 33 #endif
nuclear@10 34 #include "drawtext.h"
nuclear@10 35 #include "drawtext_impl.h"
nuclear@10 36
nuclear@10 37 #define FTSZ_TO_PIXELS(x) ((x) / 64)
nuclear@10 38 #define MAX_IMG_WIDTH 4096
nuclear@10 39
nuclear@10 40
nuclear@10 41 #ifdef USE_FREETYPE
nuclear@10 42 static int init_freetype(void);
nuclear@10 43 static void cleanup(void);
nuclear@10 44
nuclear@10 45 static void calc_best_size(int total_width, int max_gwidth, int max_gheight,
nuclear@10 46 int padding, int pow2, int *imgw, int *imgh);
nuclear@10 47 static int next_pow2(int x);
nuclear@10 48
nuclear@10 49 static FT_Library ft;
nuclear@10 50
nuclear@10 51
nuclear@10 52 static int init_done;
nuclear@10 53
nuclear@10 54 static int init_freetype(void)
nuclear@10 55 {
nuclear@10 56 if(!init_done) {
nuclear@10 57 if(FT_Init_FreeType(&ft) != 0) {
nuclear@10 58 return -1;
nuclear@10 59 }
nuclear@10 60 atexit(cleanup);
nuclear@10 61 init_done = 1;
nuclear@10 62 }
nuclear@10 63 return 0;
nuclear@10 64 }
nuclear@10 65
nuclear@10 66 static void cleanup(void)
nuclear@10 67 {
nuclear@10 68 if(init_done) {
nuclear@10 69 FT_Done_FreeType(ft);
nuclear@10 70 }
nuclear@10 71 }
nuclear@10 72 #endif /* USE_FREETYPE */
nuclear@10 73
nuclear@10 74 struct dtx_font *dtx_open_font(const char *fname, int sz)
nuclear@10 75 {
nuclear@10 76 struct dtx_font *fnt = 0;
nuclear@10 77
nuclear@10 78 #ifdef USE_FREETYPE
nuclear@10 79 init_freetype();
nuclear@10 80
nuclear@10 81 if(!(fnt = calloc(1, sizeof *fnt))) {
nuclear@10 82 fperror("failed to allocate font structure");
nuclear@10 83 return 0;
nuclear@10 84 }
nuclear@10 85
nuclear@10 86 if(FT_New_Face(ft, fname, 0, (FT_Face*)&fnt->face) != 0) {
nuclear@10 87 fprintf(stderr, "failed to open font file: %s\n", fname);
nuclear@10 88 return 0;
nuclear@10 89 }
nuclear@10 90
nuclear@10 91 /* pre-create the extended ASCII range glyphmap */
nuclear@10 92 if(sz) {
nuclear@10 93 dtx_prepare_range(fnt, sz, 0, 256);
nuclear@10 94
nuclear@10 95 if(!dtx_font) {
nuclear@10 96 dtx_use_font(fnt, sz);
nuclear@10 97 }
nuclear@10 98 }
nuclear@10 99 #else
nuclear@10 100 fprintf(stderr, "ignoring call to dtx_open_font: not compiled with freetype support!\n");
nuclear@10 101 #endif
nuclear@10 102
nuclear@10 103 return fnt;
nuclear@10 104 }
nuclear@10 105
nuclear@10 106 struct dtx_font *dtx_open_font_glyphmap(const char *fname)
nuclear@10 107 {
nuclear@10 108 struct dtx_font *fnt;
nuclear@10 109 struct dtx_glyphmap *gmap;
nuclear@10 110
nuclear@10 111 if(!(fnt = calloc(1, sizeof *fnt))) {
nuclear@10 112 fperror("failed to allocate font structure");
nuclear@10 113 return 0;
nuclear@10 114 }
nuclear@10 115
nuclear@10 116 if(fname) {
nuclear@10 117 if(!(gmap = dtx_load_glyphmap(fname))) {
nuclear@10 118 free(fnt);
nuclear@10 119 return 0;
nuclear@10 120 }
nuclear@10 121
nuclear@10 122 dtx_add_glyphmap(fnt, gmap);
nuclear@10 123
nuclear@10 124 if(!dtx_font) {
nuclear@10 125 dtx_use_font(fnt, gmap->ptsize);
nuclear@10 126 }
nuclear@10 127 }
nuclear@10 128 return fnt;
nuclear@10 129 }
nuclear@10 130
nuclear@10 131 void dtx_close_font(struct dtx_font *fnt)
nuclear@10 132 {
nuclear@10 133 if(!fnt) return;
nuclear@10 134
nuclear@10 135 #ifdef USE_FREETYPE
nuclear@10 136 FT_Done_Face(fnt->face);
nuclear@10 137 #endif
nuclear@10 138
nuclear@10 139 /* destroy the glyphmaps */
nuclear@10 140 while(fnt->gmaps) {
nuclear@10 141 void *tmp = fnt->gmaps;
nuclear@10 142 fnt->gmaps = fnt->gmaps->next;
nuclear@10 143 dtx_free_glyphmap(tmp);
nuclear@10 144 }
nuclear@10 145
nuclear@10 146 free(fnt);
nuclear@10 147 }
nuclear@10 148
nuclear@10 149 void dtx_prepare(struct dtx_font *fnt, int sz)
nuclear@10 150 {
nuclear@10 151 if(!dtx_get_font_glyphmap_range(fnt, sz, 0, 256)) {
nuclear@10 152 fprintf(stderr, "%s: failed (sz: %d, range: 0-255 [ascii])\n", __FUNCTION__, sz);
nuclear@10 153 }
nuclear@10 154 }
nuclear@10 155
nuclear@10 156 void dtx_prepare_range(struct dtx_font *fnt, int sz, int cstart, int cend)
nuclear@10 157 {
nuclear@10 158 if(!dtx_get_font_glyphmap_range(fnt, sz, cstart, cend)) {
nuclear@10 159 fprintf(stderr, "%s: failed (sz: %d, range: %d-%d)\n", __FUNCTION__, sz, cstart, cend);
nuclear@10 160 }
nuclear@10 161 }
nuclear@10 162
nuclear@10 163 struct dtx_glyphmap *dtx_get_font_glyphmap(struct dtx_font *fnt, int sz, int code)
nuclear@10 164 {
nuclear@10 165 struct dtx_glyphmap *gm;
nuclear@10 166
nuclear@10 167 /* check to see if the last we've given out fits the bill */
nuclear@10 168 if(fnt->last_gmap && code >= fnt->last_gmap->cstart && code < fnt->last_gmap->cend && fnt->last_gmap->ptsize == sz) {
nuclear@10 169 return fnt->last_gmap;
nuclear@10 170 }
nuclear@10 171
nuclear@10 172 /* otherwise search for the appropriate glyphmap */
nuclear@10 173 gm = fnt->gmaps;
nuclear@10 174 while(gm) {
nuclear@10 175 if(code >= gm->cstart && code < gm->cend && sz == gm->ptsize) {
nuclear@10 176 fnt->last_gmap = gm;
nuclear@10 177 return gm;
nuclear@10 178 }
nuclear@10 179 gm = gm->next;
nuclear@10 180 }
nuclear@10 181 return 0;
nuclear@10 182 }
nuclear@10 183
nuclear@10 184 struct dtx_glyphmap *dtx_get_font_glyphmap_range(struct dtx_font *fnt, int sz, int cstart, int cend)
nuclear@10 185 {
nuclear@10 186 struct dtx_glyphmap *gm;
nuclear@10 187
nuclear@10 188 /* search the available glyphmaps to see if we've got one that includes
nuclear@10 189 * the requested range
nuclear@10 190 */
nuclear@10 191 gm = fnt->gmaps;
nuclear@10 192 while(gm) {
nuclear@10 193 if(gm->cstart <= cstart && gm->cend >= cend && gm->ptsize == sz) {
nuclear@10 194 return gm;
nuclear@10 195 }
nuclear@10 196 gm = gm->next;
nuclear@10 197 }
nuclear@10 198
nuclear@10 199 /* not found, create one and add it to the list */
nuclear@10 200 if(!(gm = dtx_create_glyphmap_range(fnt, sz, cstart, cend))) {
nuclear@10 201 return 0;
nuclear@10 202 }
nuclear@10 203 return gm;
nuclear@10 204 }
nuclear@10 205
nuclear@10 206 struct dtx_glyphmap *dtx_create_glyphmap_range(struct dtx_font *fnt, int sz, int cstart, int cend)
nuclear@10 207 {
nuclear@10 208 struct dtx_glyphmap *gmap = 0;
nuclear@10 209
nuclear@10 210 #ifdef USE_FREETYPE
nuclear@10 211 FT_Face face = fnt->face;
nuclear@10 212 int i, j;
nuclear@10 213 int gx, gy;
nuclear@10 214 int padding = 4;
nuclear@10 215 int total_width, max_width, max_height;
nuclear@10 216
nuclear@10 217 FT_Set_Char_Size(fnt->face, 0, sz * 64, 72, 72);
nuclear@10 218
nuclear@10 219 if(!(gmap = calloc(1, sizeof *gmap))) {
nuclear@10 220 return 0;
nuclear@10 221 }
nuclear@10 222
nuclear@10 223 gmap->ptsize = sz;
nuclear@10 224 gmap->cstart = cstart;
nuclear@10 225 gmap->cend = cend;
nuclear@10 226 gmap->crange = cend - cstart;
nuclear@10 227 gmap->line_advance = FTSZ_TO_PIXELS((float)face->size->metrics.height);
nuclear@10 228
nuclear@10 229 if(!(gmap->glyphs = malloc(gmap->crange * sizeof *gmap->glyphs))) {
nuclear@10 230 free(gmap);
nuclear@10 231 return 0;
nuclear@10 232 }
nuclear@10 233
nuclear@10 234 total_width = padding;
nuclear@10 235 max_width = max_height = 0;
nuclear@10 236
nuclear@10 237 for(i=0; i<gmap->crange; i++) {
nuclear@10 238 int w, h;
nuclear@10 239
nuclear@10 240 FT_Load_Char(face, i + cstart, 0);
nuclear@10 241 w = FTSZ_TO_PIXELS(face->glyph->metrics.width);
nuclear@10 242 h = FTSZ_TO_PIXELS(face->glyph->metrics.height);
nuclear@10 243
nuclear@10 244 if(w > max_width) max_width = w;
nuclear@10 245 if(h > max_height) max_height = h;
nuclear@10 246
nuclear@10 247 total_width += w + padding;
nuclear@10 248 }
nuclear@10 249
nuclear@10 250 calc_best_size(total_width, max_width, max_height, padding, 1, &gmap->xsz, &gmap->ysz);
nuclear@10 251
nuclear@10 252 if(!(gmap->pixels = malloc(gmap->xsz * gmap->ysz))) {
nuclear@10 253 free(gmap->glyphs);
nuclear@10 254 free(gmap);
nuclear@10 255 return 0;
nuclear@10 256 }
nuclear@10 257 memset(gmap->pixels, 0, gmap->xsz * gmap->ysz);
nuclear@10 258
nuclear@10 259 gx = padding;
nuclear@10 260 gy = padding;
nuclear@10 261
nuclear@10 262 for(i=0; i<gmap->crange; i++) {
nuclear@10 263 float gwidth, gheight;
nuclear@10 264 unsigned char *src, *dst;
nuclear@10 265 FT_GlyphSlot glyph;
nuclear@10 266
nuclear@10 267 FT_Load_Char(face, i + cstart, FT_LOAD_RENDER);
nuclear@10 268 glyph = face->glyph;
nuclear@10 269 gwidth = FTSZ_TO_PIXELS((float)glyph->metrics.width);
nuclear@10 270 gheight = FTSZ_TO_PIXELS((float)glyph->metrics.height);
nuclear@10 271
nuclear@10 272 if(gx > gmap->xsz - gwidth - padding) {
nuclear@10 273 gx = padding;
nuclear@10 274 gy += max_height + padding;
nuclear@10 275 }
nuclear@10 276
nuclear@10 277 src = glyph->bitmap.buffer;
nuclear@10 278 dst = gmap->pixels + gy * gmap->xsz + gx;
nuclear@10 279
nuclear@10 280 for(j=0; j<glyph->bitmap.rows; j++) {
nuclear@10 281 memcpy(dst, src, glyph->bitmap.width);
nuclear@10 282 dst += gmap->xsz;
nuclear@10 283 src += glyph->bitmap.pitch;
nuclear@10 284 }
nuclear@10 285
nuclear@10 286 gmap->glyphs[i].code = i;
nuclear@10 287 gmap->glyphs[i].x = gx - 1;
nuclear@10 288 gmap->glyphs[i].y = gy - 1;
nuclear@10 289 gmap->glyphs[i].width = gwidth + 2;
nuclear@10 290 gmap->glyphs[i].height = gheight + 2;
nuclear@10 291 gmap->glyphs[i].orig_x = -FTSZ_TO_PIXELS((float)glyph->metrics.horiBearingX) + 1;
nuclear@10 292 gmap->glyphs[i].orig_y = FTSZ_TO_PIXELS((float)glyph->metrics.height - glyph->metrics.horiBearingY) + 1;
nuclear@10 293 gmap->glyphs[i].advance = FTSZ_TO_PIXELS((float)glyph->metrics.horiAdvance);
nuclear@10 294 /* also precalc normalized */
nuclear@10 295 gmap->glyphs[i].nx = (float)gmap->glyphs[i].x / (float)gmap->xsz;
nuclear@10 296 gmap->glyphs[i].ny = (float)gmap->glyphs[i].y / (float)gmap->ysz;
nuclear@10 297 gmap->glyphs[i].nwidth = (float)gmap->glyphs[i].width / (float)gmap->xsz;
nuclear@10 298 gmap->glyphs[i].nheight = (float)gmap->glyphs[i].height / (float)gmap->ysz;
nuclear@10 299
nuclear@10 300 gx += gwidth + padding;
nuclear@10 301 }
nuclear@10 302
nuclear@10 303 /* add it to the glyphmaps list of the font */
nuclear@10 304 dtx_add_glyphmap(fnt, gmap);
nuclear@10 305 #endif /* USE_FREETYPE */
nuclear@10 306
nuclear@10 307 return gmap;
nuclear@10 308 }
nuclear@10 309
nuclear@10 310 void dtx_free_glyphmap(struct dtx_glyphmap *gmap)
nuclear@10 311 {
nuclear@10 312 if(gmap) {
nuclear@10 313 free(gmap->pixels);
nuclear@10 314 free(gmap->glyphs);
nuclear@10 315 free(gmap);
nuclear@10 316 }
nuclear@10 317 }
nuclear@10 318
nuclear@10 319 unsigned char *dtx_get_glyphmap_pixels(struct dtx_glyphmap *gmap)
nuclear@10 320 {
nuclear@10 321 return gmap->pixels;
nuclear@10 322 }
nuclear@10 323
nuclear@10 324 int dtx_get_glyphmap_width(struct dtx_glyphmap *gmap)
nuclear@10 325 {
nuclear@10 326 return gmap->xsz;
nuclear@10 327 }
nuclear@10 328
nuclear@10 329 int dtx_get_glyphmap_height(struct dtx_glyphmap *gmap)
nuclear@10 330 {
nuclear@10 331 return gmap->ysz;
nuclear@10 332 }
nuclear@10 333
nuclear@10 334 struct dtx_glyphmap *dtx_load_glyphmap(const char *fname)
nuclear@10 335 {
nuclear@10 336 FILE *fp;
nuclear@10 337 struct dtx_glyphmap *gmap;
nuclear@10 338
nuclear@10 339 if(!(fp = fopen(fname, "rb"))) {
nuclear@10 340 return 0;
nuclear@10 341 }
nuclear@10 342 gmap = dtx_load_glyphmap_stream(fp);
nuclear@10 343 fclose(fp);
nuclear@10 344 return gmap;
nuclear@10 345 }
nuclear@10 346
nuclear@10 347 struct dtx_glyphmap *dtx_load_glyphmap_stream(FILE *fp)
nuclear@10 348 {
nuclear@10 349 char buf[512];
nuclear@10 350 int hdr_lines = 0;
nuclear@10 351 struct dtx_glyphmap *gmap;
nuclear@10 352 struct glyph *glyphs = 0;
nuclear@10 353 struct glyph *g;
nuclear@10 354 int min_code = INT_MAX;
nuclear@10 355 int max_code = INT_MIN;
nuclear@10 356 int i, max_pixval, num_pixels;
nuclear@10 357
nuclear@10 358 if(!(gmap = calloc(1, sizeof *gmap))) {
nuclear@10 359 fperror("failed to allocate glyphmap");
nuclear@10 360 return 0;
nuclear@10 361 }
nuclear@10 362 gmap->ptsize = -1;
nuclear@10 363 gmap->line_advance = FLT_MIN;
nuclear@10 364
nuclear@10 365 while(hdr_lines < 3) {
nuclear@10 366 char *line = buf;
nuclear@10 367 if(!fgets(buf, sizeof buf, fp)) {
nuclear@10 368 fperror("unexpected end of file");
nuclear@10 369 goto err;
nuclear@10 370 }
nuclear@10 371
nuclear@10 372 while(isspace(*line)) {
nuclear@10 373 line++;
nuclear@10 374 }
nuclear@10 375
nuclear@10 376 if(line[0] == '#') {
nuclear@10 377 int c, res;
nuclear@10 378 float x, y, xsz, ysz, orig_x, orig_y, adv, line_adv;
nuclear@10 379 int ptsize;
nuclear@10 380
nuclear@10 381 if((res = sscanf(line + 1, " size: %d\n", &ptsize)) == 1) {
nuclear@10 382 gmap->ptsize = ptsize;
nuclear@10 383
nuclear@10 384 } else if((res = sscanf(line + 1, " advance: %f\n", &line_adv)) == 1) {
nuclear@10 385 gmap->line_advance = line_adv;
nuclear@10 386
nuclear@10 387 } else if((res = sscanf(line + 1, " %d: %fx%f+%f+%f o:%f,%f adv:%f\n",
nuclear@10 388 &c, &xsz, &ysz, &x, &y, &orig_x, &orig_y, &adv)) == 8) {
nuclear@10 389 if(!(g = malloc(sizeof *g))) {
nuclear@10 390 fperror("failed to allocate glyph");
nuclear@10 391 goto err;
nuclear@10 392 }
nuclear@10 393 g->code = c;
nuclear@10 394 g->x = x;
nuclear@10 395 g->y = y;
nuclear@10 396 g->width = xsz;
nuclear@10 397 g->height = ysz;
nuclear@10 398 g->orig_x = orig_x;
nuclear@10 399 g->orig_y = orig_y;
nuclear@10 400 g->advance = adv;
nuclear@10 401 /* normalized coordinates will be precalculated after everything is loaded */
nuclear@10 402
nuclear@10 403 g->next = glyphs;
nuclear@10 404 glyphs = g;
nuclear@10 405
nuclear@10 406 if(c < min_code) {
nuclear@10 407 min_code = c;
nuclear@10 408 }
nuclear@10 409 if(c > max_code) {
nuclear@10 410 max_code = c;
nuclear@10 411 }
nuclear@10 412
nuclear@10 413 } else {
nuclear@10 414 fprintf(stderr, "%s: invalid glyph info line\n", __FUNCTION__);
nuclear@10 415 goto err;
nuclear@10 416 }
nuclear@10 417
nuclear@10 418 } else {
nuclear@10 419 switch(hdr_lines) {
nuclear@10 420 case 0:
nuclear@10 421 if(0[line] != 'P' || 1[line] != '6') {
nuclear@10 422 fprintf(stderr, "%s: invalid file format (magic)\n", __FUNCTION__);
nuclear@10 423 goto err;
nuclear@10 424 }
nuclear@10 425 break;
nuclear@10 426
nuclear@10 427 case 1:
nuclear@10 428 if(sscanf(line, "%d %d", &gmap->xsz, &gmap->ysz) != 2) {
nuclear@10 429 fprintf(stderr, "%s: invalid file format (dim)\n", __FUNCTION__);
nuclear@10 430 goto err;
nuclear@10 431 }
nuclear@10 432 break;
nuclear@10 433
nuclear@10 434 case 2:
nuclear@10 435 {
nuclear@10 436 char *endp;
nuclear@10 437 max_pixval = strtol(line, &endp, 10);
nuclear@10 438 if(endp == line) {
nuclear@10 439 fprintf(stderr, "%s: invalid file format (maxval)\n", __FUNCTION__);
nuclear@10 440 goto err;
nuclear@10 441 }
nuclear@10 442 }
nuclear@10 443 break;
nuclear@10 444
nuclear@10 445 default:
nuclear@10 446 break; /* can't happen */
nuclear@10 447 }
nuclear@10 448 hdr_lines++;
nuclear@10 449 }
nuclear@10 450 }
nuclear@10 451
nuclear@10 452 if(gmap->ptsize == -1 || gmap->line_advance == FLT_MIN) {
nuclear@10 453 fprintf(stderr, "%s: invalid glyphmap, insufficient information in ppm comments\n", __FUNCTION__);
nuclear@10 454 goto err;
nuclear@10 455 }
nuclear@10 456
nuclear@10 457 /* precalculate normalized glyph coordinates */
nuclear@10 458 g = glyphs;
nuclear@10 459 while(g) {
nuclear@10 460 g->nx = g->x / gmap->xsz;
nuclear@10 461 g->ny = g->y / gmap->ysz;
nuclear@10 462 g->nwidth = g->width / gmap->xsz;
nuclear@10 463 g->nheight = g->height / gmap->ysz;
nuclear@10 464 g = g->next;
nuclear@10 465 }
nuclear@10 466
nuclear@10 467 num_pixels = gmap->xsz * gmap->ysz;
nuclear@10 468 if(!(gmap->pixels = malloc(num_pixels))) {
nuclear@10 469 fperror("failed to allocate pixels");
nuclear@10 470 goto err;
nuclear@10 471 }
nuclear@10 472
nuclear@10 473 for(i=0; i<num_pixels; i++) {
nuclear@10 474 long c = fgetc(fp);
nuclear@10 475 if(c == -1) {
nuclear@10 476 fprintf(stderr, "unexpected end of file while reading pixels\n");
nuclear@10 477 goto err;
nuclear@10 478 }
nuclear@10 479 gmap->pixels[i] = 255 * c / max_pixval;
nuclear@10 480 fseek(fp, 2, SEEK_CUR);
nuclear@10 481 }
nuclear@10 482
nuclear@10 483 gmap->cstart = min_code;
nuclear@10 484 gmap->cend = max_code + 1;
nuclear@10 485 gmap->crange = gmap->cend - gmap->cstart;
nuclear@10 486
nuclear@10 487 if(!(gmap->glyphs = calloc(gmap->crange, sizeof *gmap->glyphs))) {
nuclear@10 488 fperror("failed to allocate glyph info");
nuclear@10 489 goto err;
nuclear@10 490 }
nuclear@10 491
nuclear@10 492 while(glyphs) {
nuclear@10 493 struct glyph *g = glyphs;
nuclear@10 494 glyphs = glyphs->next;
nuclear@10 495
nuclear@10 496 gmap->glyphs[g->code - gmap->cstart] = *g;
nuclear@10 497 free(g);
nuclear@10 498 }
nuclear@10 499 return gmap;
nuclear@10 500
nuclear@10 501 err:
nuclear@10 502 dtx_free_glyphmap(gmap);
nuclear@10 503 while(glyphs) {
nuclear@10 504 void *tmp = glyphs;
nuclear@10 505 glyphs = glyphs->next;
nuclear@10 506 free(tmp);
nuclear@10 507 }
nuclear@10 508 return 0;
nuclear@10 509 }
nuclear@10 510
nuclear@10 511 int dtx_save_glyphmap(const char *fname, const struct dtx_glyphmap *gmap)
nuclear@10 512 {
nuclear@10 513 FILE *fp;
nuclear@10 514 int res;
nuclear@10 515
nuclear@10 516 if(!(fp = fopen(fname, "wb"))) {
nuclear@10 517 fprintf(stderr, "%s: failed to open file: %s: %s\n", __FUNCTION__, fname, strerror(errno));
nuclear@10 518 return -1;
nuclear@10 519 }
nuclear@10 520 res = dtx_save_glyphmap_stream(fp, gmap);
nuclear@10 521 fclose(fp);
nuclear@10 522 return res;
nuclear@10 523 }
nuclear@10 524
nuclear@10 525 int dtx_save_glyphmap_stream(FILE *fp, const struct dtx_glyphmap *gmap)
nuclear@10 526 {
nuclear@10 527 int i, num_pixels;
nuclear@10 528 struct glyph *g = gmap->glyphs;
nuclear@10 529
nuclear@10 530 fprintf(fp, "P6\n%d %d\n", gmap->xsz, gmap->ysz);
nuclear@10 531 fprintf(fp, "# size: %d\n", gmap->ptsize);
nuclear@10 532 fprintf(fp, "# advance: %g\n", gmap->line_advance);
nuclear@10 533 for(i=0; i<gmap->crange; i++) {
nuclear@10 534 fprintf(fp, "# %d: %gx%g+%g+%g o:%g,%g adv:%g\n", g->code, g->width, g->height, g->x, g->y,
nuclear@10 535 g->orig_x, g->orig_y, g->advance);
nuclear@10 536 g++;
nuclear@10 537 }
nuclear@10 538 fprintf(fp, "255\n");
nuclear@10 539
nuclear@10 540 num_pixels = gmap->xsz * gmap->ysz;
nuclear@10 541 for(i=0; i<num_pixels; i++) {
nuclear@10 542 int c = gmap->pixels[i];
nuclear@10 543 fputc(c, fp);
nuclear@10 544 fputc(c, fp);
nuclear@10 545 fputc(c, fp);
nuclear@10 546 }
nuclear@10 547 return 0;
nuclear@10 548 }
nuclear@10 549
nuclear@10 550 void dtx_add_glyphmap(struct dtx_font *fnt, struct dtx_glyphmap *gmap)
nuclear@10 551 {
nuclear@10 552 gmap->next = fnt->gmaps;
nuclear@10 553 fnt->gmaps = gmap;
nuclear@10 554 }
nuclear@10 555
nuclear@10 556
nuclear@10 557 void dtx_use_font(struct dtx_font *fnt, int sz)
nuclear@10 558 {
nuclear@10 559 dtx_gl_init();
nuclear@10 560
nuclear@10 561 dtx_font = fnt;
nuclear@10 562 dtx_font_sz = sz;
nuclear@10 563 }
nuclear@10 564
nuclear@10 565 float dtx_line_height(void)
nuclear@10 566 {
nuclear@10 567 struct dtx_glyphmap *gmap = dtx_get_font_glyphmap(dtx_font, dtx_font_sz, '\n');
nuclear@10 568
nuclear@10 569 return gmap->line_advance;
nuclear@10 570 }
nuclear@10 571
nuclear@10 572 void dtx_glyph_box(int code, struct dtx_box *box)
nuclear@10 573 {
nuclear@10 574 int cidx;
nuclear@10 575 struct dtx_glyphmap *gmap;
nuclear@10 576 gmap = dtx_get_font_glyphmap(dtx_font, dtx_font_sz, code);
nuclear@10 577
nuclear@10 578 cidx = code - gmap->cstart;
nuclear@10 579
nuclear@10 580 box->x = gmap->glyphs[cidx].orig_x;
nuclear@10 581 box->y = gmap->glyphs[cidx].orig_y;
nuclear@10 582 box->width = gmap->glyphs[cidx].width;
nuclear@10 583 box->height = gmap->glyphs[cidx].height;
nuclear@10 584 }
nuclear@10 585
nuclear@10 586 float dtx_glyph_width(int code)
nuclear@10 587 {
nuclear@10 588 struct dtx_box box;
nuclear@10 589 dtx_glyph_box(code, &box);
nuclear@10 590 return box.width;
nuclear@10 591 }
nuclear@10 592
nuclear@10 593 float dtx_glyph_height(int code)
nuclear@10 594 {
nuclear@10 595 struct dtx_box box;
nuclear@10 596 dtx_glyph_box(code, &box);
nuclear@10 597 return box.height;
nuclear@10 598 }
nuclear@10 599
nuclear@10 600 void dtx_string_box(const char *str, struct dtx_box *box)
nuclear@10 601 {
nuclear@10 602 int code;
nuclear@10 603 float pos_x = 0.0f, pos_y = 0.0f;
nuclear@10 604 struct glyph *g = 0;
nuclear@10 605 float x0, y0, x1, y1;
nuclear@10 606
nuclear@10 607 x0 = y0 = FLT_MAX;
nuclear@10 608 x1 = y1 = -FLT_MAX;
nuclear@10 609
nuclear@10 610 while(*str) {
nuclear@10 611 float px, py;
nuclear@10 612 struct dtx_glyphmap *gmap;
nuclear@10 613
nuclear@10 614 code = dtx_utf8_char_code(str);
nuclear@10 615 str = dtx_utf8_next_char((char*)str);
nuclear@10 616
nuclear@10 617 px = pos_x;
nuclear@10 618 py = pos_y;
nuclear@10 619
nuclear@10 620 if((gmap = dtx_proc_char(code, &pos_x, &pos_y))) {
nuclear@10 621 g = gmap->glyphs + code - gmap->cstart;
nuclear@10 622
nuclear@10 623 if(px + g->orig_x < x0) {
nuclear@10 624 x0 = px + g->orig_x;
nuclear@10 625 }
nuclear@10 626 if(py - g->orig_y < y0) {
nuclear@10 627 y0 = py - g->orig_y;
nuclear@10 628 }
nuclear@10 629 if(px + g->orig_x + g->width > x1) {
nuclear@10 630 x1 = px + g->orig_x + g->width;
nuclear@10 631 }
nuclear@10 632 if(py - g->orig_y + g->height > y1) {
nuclear@10 633 y1 = py - g->orig_y + g->height;
nuclear@10 634 }
nuclear@10 635 }
nuclear@10 636 }
nuclear@10 637
nuclear@10 638 box->x = x0;
nuclear@10 639 box->y = y0;
nuclear@10 640 box->width = x1 - x0;
nuclear@10 641 box->height = y1 - y0;
nuclear@10 642 }
nuclear@10 643
nuclear@10 644 float dtx_string_width(const char *str)
nuclear@10 645 {
nuclear@10 646 struct dtx_box box;
nuclear@10 647
nuclear@10 648 dtx_string_box(str, &box);
nuclear@10 649 return box.width;
nuclear@10 650 }
nuclear@10 651
nuclear@10 652 float dtx_string_height(const char *str)
nuclear@10 653 {
nuclear@10 654 struct dtx_box box;
nuclear@10 655
nuclear@10 656 dtx_string_box(str, &box);
nuclear@10 657 return box.height;
nuclear@10 658 }
nuclear@10 659
nuclear@10 660 float dtx_char_pos(const char *str, int n)
nuclear@10 661 {
nuclear@10 662 int i;
nuclear@10 663 float pos = 0.0;
nuclear@10 664 struct dtx_glyphmap *gmap;
nuclear@10 665
nuclear@10 666 for(i=0; i<n; i++) {
nuclear@10 667 int code = dtx_utf8_char_code(str);
nuclear@10 668 str = dtx_utf8_next_char((char*)str);
nuclear@10 669
nuclear@10 670 gmap = dtx_get_font_glyphmap(dtx_font, dtx_font_sz, code);
nuclear@10 671 pos += gmap->glyphs[i].advance;
nuclear@10 672 }
nuclear@10 673 return pos;
nuclear@10 674 }
nuclear@10 675
nuclear@10 676 int dtx_char_at_pt(const char *str, float pt)
nuclear@10 677 {
nuclear@10 678 int i;
nuclear@10 679 float prev_pos = 0.0f, pos = 0.0f;
nuclear@10 680 struct dtx_glyphmap *gmap;
nuclear@10 681
nuclear@10 682 for(i=0; *str; i++) {
nuclear@10 683 int code = dtx_utf8_char_code(str);
nuclear@10 684 str = dtx_utf8_next_char((char*)str);
nuclear@10 685
nuclear@10 686 gmap = dtx_get_font_glyphmap(dtx_font, dtx_font_sz, code);
nuclear@10 687 pos += gmap->glyphs[i].advance;
nuclear@10 688
nuclear@10 689 if(fabs(pt - prev_pos) < fabs(pt - pos)) {
nuclear@10 690 break;
nuclear@10 691 }
nuclear@10 692 prev_pos = pos;
nuclear@10 693 }
nuclear@10 694 return i;
nuclear@10 695 }
nuclear@10 696
nuclear@10 697 struct dtx_glyphmap *dtx_proc_char(int code, float *xpos, float *ypos)
nuclear@10 698 {
nuclear@10 699 struct dtx_glyphmap *gmap;
nuclear@10 700 gmap = dtx_get_font_glyphmap(dtx_font, dtx_font_sz, code);
nuclear@10 701
nuclear@10 702 switch(code) {
nuclear@10 703 case '\n':
nuclear@10 704 *xpos = 0.0;
nuclear@10 705 if(gmap) {
nuclear@10 706 *ypos -= gmap->line_advance;
nuclear@10 707 }
nuclear@10 708 return 0;
nuclear@10 709
nuclear@10 710 case '\t':
nuclear@10 711 if(gmap) {
nuclear@10 712 *xpos = (fmod(*xpos, 4.0) + 4.0) * gmap->glyphs[0].advance;
nuclear@10 713 }
nuclear@10 714 return 0;
nuclear@10 715
nuclear@10 716 case '\r':
nuclear@10 717 *xpos = 0.0;
nuclear@10 718 return 0;
nuclear@10 719
nuclear@10 720 default:
nuclear@10 721 break;
nuclear@10 722 }
nuclear@10 723
nuclear@10 724 if(gmap) {
nuclear@10 725 *xpos += gmap->glyphs[code - gmap->cstart].advance;
nuclear@10 726 }
nuclear@10 727 return gmap;
nuclear@10 728 }
nuclear@10 729
nuclear@10 730 #ifdef USE_FREETYPE
nuclear@10 731 static void calc_best_size(int total_width, int max_gwidth, int max_gheight, int padding, int pow2, int *imgw, int *imgh)
nuclear@10 732 {
nuclear@10 733 int xsz, ysz, num_rows;
nuclear@10 734 float aspect;
nuclear@10 735
nuclear@10 736 for(xsz=2; xsz<=MAX_IMG_WIDTH; xsz *= 2) {
nuclear@10 737 num_rows = total_width / xsz + 1;
nuclear@10 738
nuclear@10 739 /* assume worst case, all last glyphs will float to the next line
nuclear@10 740 * so let's add extra rows for that. */
nuclear@10 741 num_rows += (padding + (max_gwidth + padding) * num_rows + xsz - 1) / xsz;
nuclear@10 742
nuclear@10 743 ysz = num_rows * (max_gheight + padding) + padding;
nuclear@10 744 if(pow2) {
nuclear@10 745 ysz = next_pow2(ysz);
nuclear@10 746 }
nuclear@10 747 aspect = (float)xsz / (float)ysz;
nuclear@10 748
nuclear@10 749 if(aspect >= 1.0) {
nuclear@10 750 break;
nuclear@10 751 }
nuclear@10 752 }
nuclear@10 753
nuclear@10 754 if(xsz > MAX_IMG_WIDTH) {
nuclear@10 755 xsz = MAX_IMG_WIDTH;
nuclear@10 756 }
nuclear@10 757
nuclear@10 758 *imgw = xsz;
nuclear@10 759 *imgh = ysz;
nuclear@10 760 }
nuclear@10 761
nuclear@10 762
nuclear@10 763 static int next_pow2(int x)
nuclear@10 764 {
nuclear@10 765 x--;
nuclear@10 766 x = (x >> 1) | x;
nuclear@10 767 x = (x >> 2) | x;
nuclear@10 768 x = (x >> 4) | x;
nuclear@10 769 x = (x >> 8) | x;
nuclear@10 770 x = (x >> 16) | x;
nuclear@10 771 return x + 1;
nuclear@10 772 }
nuclear@10 773 #endif