1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562
|
/* Pango
* pangoft2.c: Routines for handling FreeType2 fonts
*
* Copyright (C) 1999 Red Hat Software
* Copyright (C) 2000 Tor Lillqvist
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:freetype-fonts
* @short_description:Functions for shape engines to manipulate FreeType fonts
* @title:FreeType Fonts and Rendering
*
* The macros and functions in this section are used to access fonts and render
* text to bitmaps using the FreeType 2 library.
*/
#include "config.h"
#include <string.h>
#include <stdlib.h>
#include <math.h>
#include <glib.h>
#include <glib/gprintf.h>
#include "pangoft2.h"
#include "pangoft2-private.h"
#include "pangofc-fontmap.h"
#include "pangofc-private.h"
/* for compatibility with older freetype versions */
#ifndef FT_LOAD_TARGET_MONO
#define FT_LOAD_TARGET_MONO FT_LOAD_MONOCHROME
#endif
#define PANGO_FT2_FONT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), PANGO_TYPE_FT2_FONT, PangoFT2FontClass))
#define PANGO_FT2_IS_FONT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), PANGO_TYPE_FT2_FONT))
#define PANGO_FT2_FONT_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), PANGO_TYPE_FT2_FONT, PangoFT2FontClass))
typedef struct _PangoFT2FontClass PangoFT2FontClass;
struct _PangoFT2FontClass
{
PangoFcFontClass parent_class;
};
static void pango_ft2_font_finalize (GObject *object);
static void pango_ft2_font_get_glyph_extents (PangoFont *font,
PangoGlyph glyph,
PangoRectangle *ink_rect,
PangoRectangle *logical_rect);
static FT_Face pango_ft2_font_real_lock_face (PangoFcFont *font);
static void pango_ft2_font_real_unlock_face (PangoFcFont *font);
PangoFT2Font *
_pango_ft2_font_new (PangoFT2FontMap *ft2fontmap,
FcPattern *pattern)
{
PangoFontMap *fontmap = PANGO_FONT_MAP (ft2fontmap);
PangoFT2Font *ft2font;
double d;
g_return_val_if_fail (fontmap != NULL, NULL);
g_return_val_if_fail (pattern != NULL, NULL);
ft2font = (PangoFT2Font *)g_object_new (PANGO_TYPE_FT2_FONT,
"pattern", pattern,
"fontmap", fontmap,
NULL);
if (FcPatternGetDouble (pattern, FC_PIXEL_SIZE, 0, &d) == FcResultMatch)
ft2font->size = d*PANGO_SCALE;
return ft2font;
}
static void
load_fallback_face (PangoFT2Font *ft2font,
const char *original_file)
{
PangoFcFont *fcfont = PANGO_FC_FONT (ft2font);
FcPattern *sans;
FcPattern *matched;
FcResult result;
FT_Error error;
FcChar8 *filename2 = NULL;
gchar *name;
int id;
sans = FcPatternBuild (NULL,
FC_FAMILY, FcTypeString, "sans",
FC_PIXEL_SIZE, FcTypeDouble, (double)ft2font->size / PANGO_SCALE,
NULL);
_pango_ft2_font_map_default_substitute ((PangoFcFontMap *)fcfont->fontmap, sans);
matched = FcFontMatch (pango_fc_font_map_get_config ((PangoFcFontMap *)fcfont->fontmap), sans, &result);
if (FcPatternGetString (matched, FC_FILE, 0, &filename2) != FcResultMatch)
goto bail1;
if (FcPatternGetInteger (matched, FC_INDEX, 0, &id) != FcResultMatch)
goto bail1;
error = FT_New_Face (_pango_ft2_font_map_get_library (fcfont->fontmap),
(char *) filename2, id, &ft2font->face);
if (error)
{
bail1:
name = pango_font_description_to_string (fcfont->description);
g_error ("Unable to open font file %s for font %s, exiting\n", filename2, name);
}
else
{
name = pango_font_description_to_string (fcfont->description);
g_warning ("Unable to open font file %s for font %s, falling back to %s\n", original_file, name, filename2);
g_free (name);
}
FcPatternDestroy (sans);
FcPatternDestroy (matched);
}
static void
set_transform (PangoFT2Font *ft2font)
{
PangoFcFont *fcfont = (PangoFcFont *)ft2font;
FcMatrix *fc_matrix;
if (FcPatternGetMatrix (fcfont->font_pattern, FC_MATRIX, 0, &fc_matrix) == FcResultMatch)
{
FT_Matrix ft_matrix;
ft_matrix.xx = 0x10000L * fc_matrix->xx;
ft_matrix.yy = 0x10000L * fc_matrix->yy;
ft_matrix.xy = 0x10000L * fc_matrix->xy;
ft_matrix.yx = 0x10000L * fc_matrix->yx;
FT_Set_Transform (ft2font->face, &ft_matrix, NULL);
}
}
/**
* pango_ft2_font_get_face:
* @font: a #PangoFont
*
* Returns the native FreeType2 <type>FT_Face</type> structure used for this #PangoFont.
* This may be useful if you want to use FreeType2 functions directly.
*
* Use pango_fc_font_lock_face() instead; when you are done with a
* face from pango_fc_font_lock_face() you must call
* pango_fc_font_unlock_face().
*
* Return value: (nullable): a pointer to a <type>FT_Face</type>
* structure, with the size set correctly, or %NULL if
* @font is %NULL.
**/
FT_Face
pango_ft2_font_get_face (PangoFont *font)
{
PangoFT2Font *ft2font = (PangoFT2Font *)font;
PangoFcFont *fcfont = (PangoFcFont *)font;
FT_Error error;
FcPattern *pattern;
FcChar8 *filename;
FcBool antialias, hinting, autohint;
int hintstyle;
int id;
if (G_UNLIKELY (!font))
return NULL;
pattern = fcfont->font_pattern;
if (!ft2font->face)
{
ft2font->load_flags = 0;
/* disable antialiasing if requested */
if (FcPatternGetBool (pattern,
FC_ANTIALIAS, 0, &antialias) != FcResultMatch)
antialias = FcTrue;
if (antialias)
ft2font->load_flags |= FT_LOAD_NO_BITMAP;
else
ft2font->load_flags |= FT_LOAD_TARGET_MONO;
/* disable hinting if requested */
if (FcPatternGetBool (pattern,
FC_HINTING, 0, &hinting) != FcResultMatch)
hinting = FcTrue;
#ifdef FC_HINT_STYLE
if (FcPatternGetInteger (pattern, FC_HINT_STYLE, 0, &hintstyle) != FcResultMatch)
hintstyle = FC_HINT_FULL;
if (!hinting || hintstyle == FC_HINT_NONE)
ft2font->load_flags |= FT_LOAD_NO_HINTING;
switch (hintstyle) {
case FC_HINT_SLIGHT:
case FC_HINT_MEDIUM:
ft2font->load_flags |= FT_LOAD_TARGET_LIGHT;
break;
default:
ft2font->load_flags |= FT_LOAD_TARGET_NORMAL;
break;
}
#else
if (!hinting)
ft2font->load_flags |= FT_LOAD_NO_HINTING;
#endif
/* force autohinting if requested */
if (FcPatternGetBool (pattern,
FC_AUTOHINT, 0, &autohint) != FcResultMatch)
autohint = FcFalse;
if (autohint)
ft2font->load_flags |= FT_LOAD_FORCE_AUTOHINT;
if (FcPatternGetString (pattern, FC_FILE, 0, &filename) != FcResultMatch)
goto bail0;
if (FcPatternGetInteger (pattern, FC_INDEX, 0, &id) != FcResultMatch)
goto bail0;
error = FT_New_Face (_pango_ft2_font_map_get_library (fcfont->fontmap),
(char *) filename, id, &ft2font->face);
if (error != FT_Err_Ok)
{
bail0:
load_fallback_face (ft2font, (char *) filename);
}
g_assert (ft2font->face);
set_transform (ft2font);
error = FT_Set_Char_Size (ft2font->face,
PANGO_PIXELS_26_6 (ft2font->size),
PANGO_PIXELS_26_6 (ft2font->size),
0, 0);
if (error)
g_warning ("Error in FT_Set_Char_Size: %d", error);
}
return ft2font->face;
}
G_DEFINE_TYPE (PangoFT2Font, pango_ft2_font, PANGO_TYPE_FC_FONT)
static void
pango_ft2_font_init (PangoFT2Font *ft2font)
{
ft2font->face = NULL;
ft2font->size = 0;
ft2font->glyph_info = g_hash_table_new (NULL, NULL);
}
static void
pango_ft2_font_class_init (PangoFT2FontClass *class)
{
GObjectClass *object_class = G_OBJECT_CLASS (class);
PangoFontClass *font_class = PANGO_FONT_CLASS (class);
PangoFcFontClass *fc_font_class = PANGO_FC_FONT_CLASS (class);
object_class->finalize = pango_ft2_font_finalize;
font_class->get_glyph_extents = pango_ft2_font_get_glyph_extents;
fc_font_class->lock_face = pango_ft2_font_real_lock_face;
fc_font_class->unlock_face = pango_ft2_font_real_unlock_face;
}
static PangoFT2GlyphInfo *
pango_ft2_font_get_glyph_info (PangoFont *font,
PangoGlyph glyph,
gboolean create)
{
PangoFT2Font *ft2font = (PangoFT2Font *)font;
PangoFcFont *fcfont = (PangoFcFont *)font;
PangoFT2GlyphInfo *info;
info = g_hash_table_lookup (ft2font->glyph_info, GUINT_TO_POINTER (glyph));
if ((info == NULL) && create)
{
info = g_slice_new0 (PangoFT2GlyphInfo);
pango_fc_font_get_raw_extents (fcfont, ft2font->load_flags,
glyph,
&info->ink_rect,
&info->logical_rect);
g_hash_table_insert (ft2font->glyph_info, GUINT_TO_POINTER(glyph), info);
}
return info;
}
static void
pango_ft2_font_get_glyph_extents (PangoFont *font,
PangoGlyph glyph,
PangoRectangle *ink_rect,
PangoRectangle *logical_rect)
{
PangoFT2GlyphInfo *info;
gboolean empty = FALSE;
if (glyph == PANGO_GLYPH_EMPTY)
{
glyph = pango_fc_font_get_glyph ((PangoFcFont *) font, ' ');
empty = TRUE;
}
if (glyph & PANGO_GLYPH_UNKNOWN_FLAG)
{
PangoFontMetrics *metrics = pango_font_get_metrics (font, NULL);
if (metrics)
{
if (ink_rect)
{
ink_rect->x = PANGO_SCALE;
ink_rect->width = metrics->approximate_char_width - 2 * PANGO_SCALE;
ink_rect->y = - (metrics->ascent - PANGO_SCALE);
ink_rect->height = metrics->ascent + metrics->descent - 2 * PANGO_SCALE;
}
if (logical_rect)
{
logical_rect->x = 0;
logical_rect->width = metrics->approximate_char_width;
logical_rect->y = -metrics->ascent;
logical_rect->height = metrics->ascent + metrics->descent;
}
pango_font_metrics_unref (metrics);
}
else
{
if (ink_rect)
ink_rect->x = ink_rect->y = ink_rect->height = ink_rect->width = 0;
if (logical_rect)
logical_rect->x = logical_rect->y = logical_rect->height = logical_rect->width = 0;
}
return;
}
info = pango_ft2_font_get_glyph_info (font, glyph, TRUE);
if (ink_rect)
*ink_rect = info->ink_rect;
if (logical_rect)
*logical_rect = info->logical_rect;
if (empty)
{
if (ink_rect)
ink_rect->x = ink_rect->y = ink_rect->height = ink_rect->width = 0;
if (logical_rect)
logical_rect->x = logical_rect->width = 0;
return;
}
}
/**
* pango_ft2_font_get_kerning:
* @font: a #PangoFont
* @left: the left #PangoGlyph
* @right: the right #PangoGlyph
*
* Retrieves kerning information for a combination of two glyphs.
*
* Use pango_fc_font_kern_glyphs() instead.
*
* Return value: The amount of kerning (in Pango units) to apply for
* the given combination of glyphs.
**/
int
pango_ft2_font_get_kerning (PangoFont *font,
PangoGlyph left,
PangoGlyph right)
{
PangoFcFont *fc_font = PANGO_FC_FONT (font);
FT_Face face;
FT_Error error;
FT_Vector kerning;
face = pango_fc_font_lock_face (fc_font);
if (!face)
return 0;
if (!FT_HAS_KERNING (face))
{
pango_fc_font_unlock_face (fc_font);
return 0;
}
error = FT_Get_Kerning (face, left, right, ft_kerning_default, &kerning);
if (error != FT_Err_Ok)
{
pango_fc_font_unlock_face (fc_font);
return 0;
}
pango_fc_font_unlock_face (fc_font);
return PANGO_UNITS_26_6 (kerning.x);
}
static FT_Face
pango_ft2_font_real_lock_face (PangoFcFont *font)
{
return pango_ft2_font_get_face ((PangoFont *)font);
}
static void
pango_ft2_font_real_unlock_face (PangoFcFont *font G_GNUC_UNUSED)
{
}
static gboolean
pango_ft2_free_glyph_info_callback (gpointer key G_GNUC_UNUSED,
gpointer value,
gpointer data)
{
PangoFT2Font *font = PANGO_FT2_FONT (data);
PangoFT2GlyphInfo *info = value;
if (font->glyph_cache_destroy && info->cached_glyph)
(*font->glyph_cache_destroy) (info->cached_glyph);
g_slice_free (PangoFT2GlyphInfo, info);
return TRUE;
}
static void
pango_ft2_font_finalize (GObject *object)
{
PangoFT2Font *ft2font = (PangoFT2Font *)object;
if (ft2font->face)
{
FT_Done_Face (ft2font->face);
ft2font->face = NULL;
}
g_hash_table_foreach_remove (ft2font->glyph_info,
pango_ft2_free_glyph_info_callback, object);
g_hash_table_destroy (ft2font->glyph_info);
G_OBJECT_CLASS (pango_ft2_font_parent_class)->finalize (object);
}
/**
* pango_ft2_font_get_coverage:
* @font: a <type>PangoFT2Font</type>.
* @language: a language tag.
*
* Gets the #PangoCoverage for a <type>PangoFT2Font</type>. Use
* pango_font_get_coverage() instead.
*
* Return value: a #PangoCoverage.
**/
PangoCoverage *
pango_ft2_font_get_coverage (PangoFont *font,
PangoLanguage *language)
{
return pango_font_get_coverage (font, language);
}
/* Utility functions */
/**
* pango_ft2_get_unknown_glyph:
* @font: a #PangoFont
*
* Return the index of a glyph suitable for drawing unknown characters with
* @font, or %PANGO_GLYPH_EMPTY if no suitable glyph found.
*
* If you want to draw an unknown-box for a character that is not covered
* by the font,
* use PANGO_GET_UNKNOWN_GLYPH() instead.
*
* Return value: a glyph index into @font, or %PANGO_GLYPH_EMPTY
**/
PangoGlyph
pango_ft2_get_unknown_glyph (PangoFont *font)
{
FT_Face face = pango_ft2_font_get_face (font);
if (face && FT_IS_SFNT (face))
/* TrueType fonts have an 'unknown glyph' box on glyph index 0 */
return 0;
else
return PANGO_GLYPH_EMPTY;
}
void *
_pango_ft2_font_get_cache_glyph_data (PangoFont *font,
int glyph_index)
{
PangoFT2GlyphInfo *info;
if (!PANGO_FT2_IS_FONT (font))
return NULL;
info = pango_ft2_font_get_glyph_info (font, glyph_index, FALSE);
if (info == NULL)
return NULL;
return info->cached_glyph;
}
void
_pango_ft2_font_set_cache_glyph_data (PangoFont *font,
int glyph_index,
void *cached_glyph)
{
PangoFT2GlyphInfo *info;
if (!PANGO_FT2_IS_FONT (font))
return;
info = pango_ft2_font_get_glyph_info (font, glyph_index, TRUE);
info->cached_glyph = cached_glyph;
/* TODO: Implement limiting of the number of cached glyphs */
}
void
_pango_ft2_font_set_glyph_cache_destroy (PangoFont *font,
GDestroyNotify destroy_notify)
{
if (!PANGO_FT2_IS_FONT (font))
return;
PANGO_FT2_FONT (font)->glyph_cache_destroy = destroy_notify;
}
|