src/xftfont.c

   1 /* xftfont.c -- XFT font driver.
   2    Copyright (C) 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
   3    Copyright (C) 2006, 2007, 2008, 2009
   4      National Institute of Advanced Industrial Science and Technology (AIST)
   5      Registration Number H13PRO009
   6
   7 This file is part of GNU Emacs.
   8
   9 GNU Emacs is free software: you can redistribute it and/or modify
  10 it under the terms of the GNU General Public License as published by
  11 the Free Software Foundation, either version 3 of the License, or
  12 (at your option) any later version.
  13
  14 GNU Emacs is distributed in the hope that it will be useful,
  15 but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 GNU General Public License for more details.
  18
  19 You should have received a copy of the GNU General Public License
  20 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
  21
  22 #include <config.h>
  23 #include <stdio.h>
  24 #include <X11/Xlib.h>
  25 #include <X11/Xft/Xft.h>
  26
  27 #include "lisp.h"
  28 #include "dispextern.h"
  29 #include "xterm.h"
  30 #include "frame.h"
  31 #include "blockinput.h"
  32 #include "character.h"
  33 #include "charset.h"
  34 #include "fontset.h"
  35 #include "font.h"
  36 #include "ftfont.h"
  37
  38 /* Xft font driver.  */
  39
  40 static Lisp_Object Qxft;
  41 static Lisp_Object QChinting , QCautohint, QChintstyle, QCrgba, QCembolden;
  42
  43 /* The actual structure for Xft font that can be casted to struct
  44    font.  */
  45
  46 struct xftfont_info
  47 {
  48   struct font font;
  49   /* The following three members must be here in this order to be
  50      compatible with struct ftfont_info (in ftfont.c).  */
  51 #ifdef HAVE_LIBOTF
  52   int maybe_otf;          /* Flag to tell if this may be OTF or not.  */
  53   OTF *otf;
  54 #endif  /* HAVE_LIBOTF */
  55   FT_Size ft_size;
  56   Display *display;
  57   int screen;
  58   XftFont *xftfont;
  59 };
  60
  61 /* Structure pointed by (struct face *)->extra  */
  62
  63 struct xftface_info
  64 {
  65   XftColor xft_fg;              /* color for face->foreground */
  66   XftColor xft_bg;              /* color for face->background */
  67 };
  68
  69 static void xftfont_get_colors P_ ((FRAME_PTR, struct face *, GC gc,
  70                                     struct xftface_info *,
  71                                     XftColor *fg, XftColor *bg));
  72
  73
  74 /* Setup foreground and background colors of GC into FG and BG.  If
  75    XFTFACE_INFO is not NULL, reuse the colors in it if possible.  BG
  76    may be NULL.  */
  77
  78 static void
  79 xftfont_get_colors (f, face, gc, xftface_info, fg, bg)
  80      FRAME_PTR f;
  81      struct face *face;
  82      GC gc;
  83      struct xftface_info *xftface_info;
  84      XftColor *fg, *bg;
  85 {
  86   if (xftface_info && face->gc == gc)
  87     {
  88       *fg = xftface_info->xft_fg;
  89       if (bg)
  90         *bg = xftface_info->xft_bg;
  91     }
  92   else
  93     {
  94       XGCValues xgcv;
  95       int fg_done = 0, bg_done = 0;
  96
  97       BLOCK_INPUT;
  98       XGetGCValues (FRAME_X_DISPLAY (f), gc,
  99                     GCForeground | GCBackground, &xgcv);
 100       if (xftface_info)
 101         {
 102           if (xgcv.foreground == face->foreground)
 103             *fg = xftface_info->xft_fg, fg_done = 1;
 104           else if (xgcv.foreground == face->background)
 105             *fg = xftface_info->xft_bg, fg_done = 1;
 106           if (! bg)
 107             bg_done = 1;
 108           else if (xgcv.background == face->background)
 109             *bg = xftface_info->xft_bg, bg_done = 1;
 110           else if (xgcv.background == face->foreground)
 111             *bg = xftface_info->xft_fg, bg_done = 1;
 112         }
 113
 114       if (fg_done + bg_done < 2)
 115         {
 116           XColor colors[2];
 117
 118           colors[0].pixel = fg->pixel = xgcv.foreground;
 119           if (bg)
 120             colors[1].pixel = bg->pixel = xgcv.background;
 121           XQueryColors (FRAME_X_DISPLAY (f), FRAME_X_COLORMAP (f), colors,
 122                         bg ? 2 : 1);
 123           fg->color.alpha = 0xFFFF;
 124           fg->color.red = colors[0].red;
 125           fg->color.green = colors[0].green;
 126           fg->color.blue = colors[0].blue;
 127           if (bg)
 128             {
 129               bg->color.alpha = 0xFFFF;
 130               bg->color.red = colors[1].red;
 131               bg->color.green = colors[1].green;
 132               bg->color.blue = colors[1].blue;
 133             }
 134         }
 135       UNBLOCK_INPUT;
 136     }
 137 }
 138
 139
 140 static Lisp_Object xftfont_list P_ ((Lisp_Object, Lisp_Object));
 141 static Lisp_Object xftfont_match P_ ((Lisp_Object, Lisp_Object));
 142 static Lisp_Object xftfont_open P_ ((FRAME_PTR, Lisp_Object, int));
 143 static void xftfont_close P_ ((FRAME_PTR, struct font *));
 144 static int xftfont_prepare_face P_ ((FRAME_PTR, struct face *));
 145 static void xftfont_done_face P_ ((FRAME_PTR, struct face *));
 146 static unsigned xftfont_encode_char P_ ((struct font *, int));
 147 static int xftfont_text_extents P_ ((struct font *, unsigned *, int,
 148                                      struct font_metrics *));
 149 static int xftfont_draw P_ ((struct glyph_string *, int, int, int, int, int));
 150 static int xftfont_end_for_frame P_ ((FRAME_PTR f));
 151
 152 struct font_driver xftfont_driver;
 153
 154 static Lisp_Object
 155 xftfont_list (frame, spec)
 156      Lisp_Object frame;
 157      Lisp_Object spec;
 158 {
 159   Lisp_Object list = ftfont_driver.list (frame, spec), tail;
 160
 161   for (tail = list; CONSP (tail); tail = XCDR (tail))
 162     ASET (XCAR (tail), FONT_TYPE_INDEX, Qxft);
 163   return list;
 164 }
 165
 166 static Lisp_Object
 167 xftfont_match (frame, spec)
 168      Lisp_Object frame;
 169      Lisp_Object spec;
 170 {
 171   Lisp_Object entity = ftfont_driver.match (frame, spec);
 172
 173   if (! NILP (entity))
 174     ASET (entity, FONT_TYPE_INDEX, Qxft);
 175   return entity;
 176 }
 177
 178 extern Lisp_Object ftfont_font_format P_ ((FcPattern *, Lisp_Object));
 179 extern FcCharSet *ftfont_get_fc_charset P_ ((Lisp_Object));
 180 extern Lisp_Object QCantialias;
 181
 182 static FcChar8 ascii_printable[95];
 183
 184 static Lisp_Object
 185 xftfont_open (f, entity, pixel_size)
 186      FRAME_PTR f;
 187      Lisp_Object entity;
 188      int pixel_size;
 189 {
 190   FcResult result;
 191   Display *display = FRAME_X_DISPLAY (f);
 192   Lisp_Object val, filename, index, tail, font_object;
 193   FcPattern *pat = NULL, *match;
 194   struct xftfont_info *xftfont_info = NULL;
 195   struct font *font;
 196   double size = 0;
 197   XftFont *xftfont = NULL;
 198   int spacing;
 199   char name[256];
 200   int len, i;
 201   XGlyphInfo extents;
 202   FT_Face ft_face;
 203
 204   val = assq_no_quit (QCfont_entity, AREF (entity, FONT_EXTRA_INDEX));
 205   if (! CONSP (val))
 206     return Qnil;
 207   val = XCDR (val);
 208   filename = XCAR (val);
 209   index = XCDR (val);
 210   size = XINT (AREF (entity, FONT_SIZE_INDEX));
 211   if (size == 0)
 212     size = pixel_size;
 213   pat = FcPatternCreate ();
 214   FcPatternAddInteger (pat, FC_WEIGHT, FONT_WEIGHT_NUMERIC (entity));
 215   i = FONT_SLANT_NUMERIC (entity) - 100;
 216   if (i < 0) i = 0;
 217   FcPatternAddInteger (pat, FC_SLANT, i);
 218   FcPatternAddInteger (pat, FC_WIDTH, FONT_WIDTH_NUMERIC (entity));
 219   FcPatternAddDouble (pat, FC_PIXEL_SIZE, pixel_size);
 220   val = AREF (entity, FONT_FAMILY_INDEX);
 221   if (! NILP (val))
 222     FcPatternAddString (pat, FC_FAMILY, (FcChar8 *) SDATA (SYMBOL_NAME (val)));
 223   val = AREF (entity, FONT_FOUNDRY_INDEX);
 224   if (! NILP (val))
 225     FcPatternAddString (pat, FC_FOUNDRY, (FcChar8 *) SDATA (SYMBOL_NAME (val)));
 226   val = AREF (entity, FONT_SPACING_INDEX);
 227   if (! NILP (val))
 228     FcPatternAddInteger (pat, FC_SPACING, XINT (val));
 229   val = AREF (entity, FONT_DPI_INDEX);
 230   if (! NILP (val))
 231     {
 232       double dbl = XINT (val);
 233
 234       FcPatternAddDouble (pat, FC_DPI, dbl);
 235     }
 236   val = AREF (entity, FONT_AVGWIDTH_INDEX);
 237   if (INTEGERP (val) && XINT (val) == 0)
 238     FcPatternAddBool (pat, FC_SCALABLE, FcTrue);
 239   /* This is necessary to identify the exact font (e.g. 10x20.pcf.gz
 240      over 10x20-ISO8859-1.pcf.gz).  */
 241   FcPatternAddCharSet (pat, FC_CHARSET, ftfont_get_fc_charset (entity));
 242
 243   for (tail = AREF (entity, FONT_EXTRA_INDEX); CONSP (tail); tail = XCDR (tail))
 244     {
 245       Lisp_Object key, val;
 246
 247       key = XCAR (XCAR (tail)), val = XCDR (XCAR (tail));
 248       if (EQ (key, QCantialias))
 249         FcPatternAddBool (pat, FC_ANTIALIAS, NILP (val) ? FcFalse : FcTrue);
 250       else if (EQ (key, QChinting))
 251         FcPatternAddBool (pat, FC_HINTING, NILP (val) ? FcFalse : FcTrue);
 252       else if (EQ (key, QCautohint))
 253         FcPatternAddBool (pat, FC_AUTOHINT, NILP (val) ? FcFalse : FcTrue);
 254       else if (EQ (key, QChintstyle))
 255         {
 256           if (INTEGERP (val))
 257             FcPatternAddInteger (pat, FC_RGBA, XINT (val));
 258         }
 259       else if (EQ (key, QCrgba))
 260         {
 261           if (INTEGERP (val))
 262             FcPatternAddInteger (pat, FC_RGBA, XINT (val));
 263         }
 264 #ifdef FC_EMBOLDEN
 265       else if (EQ (key, QCembolden))
 266         FcPatternAddBool (pat, FC_EMBOLDEN, NILP (val) ? FcFalse : FcTrue);
 267 #endif
 268     }
 269
 270   FcPatternAddString (pat, FC_FILE, (FcChar8 *) SDATA (filename));
 271   FcPatternAddInteger (pat, FC_INDEX, XINT (index));
 272
 273
 274   BLOCK_INPUT;
 275   match = XftFontMatch (display, FRAME_X_SCREEN_NUMBER (f), pat, &result);
 276   FcPatternDestroy (pat);
 277   xftfont = XftFontOpenPattern (display, match);
 278   ft_face = XftLockFace (xftfont);
 279   UNBLOCK_INPUT;
 280
 281   if (! xftfont)
 282     {
 283       XftPatternDestroy (match);
 284       return Qnil;
 285     }
 286   /* We should not destroy PAT here because it is kept in XFTFONT and
 287      destroyed automatically when XFTFONT is closed.  */
 288   font_object = font_make_object (VECSIZE (struct xftfont_info), entity, size);
 289   ASET (font_object, FONT_TYPE_INDEX, Qxft);
 290   len = font_unparse_xlfd (entity, size, name, 256);
 291   if (len > 0)
 292     ASET (font_object, FONT_NAME_INDEX, make_string (name, len));
 293   len = font_unparse_fcname (entity, size, name, 256);
 294   if (len > 0)
 295     ASET (font_object, FONT_FULLNAME_INDEX, make_string (name, len));
 296   else
 297     ASET (font_object, FONT_FULLNAME_INDEX,
 298           AREF (font_object, FONT_NAME_INDEX));
 299   ASET (font_object, FONT_FILE_INDEX, filename);
 300   ASET (font_object, FONT_FORMAT_INDEX,
 301         ftfont_font_format (xftfont->pattern, filename));
 302   font = XFONT_OBJECT (font_object);
 303   font->pixel_size = pixel_size;
 304   font->driver = &xftfont_driver;
 305   font->encoding_charset = font->repertory_charset = -1;
 306
 307   xftfont_info = (struct xftfont_info *) font;
 308   xftfont_info->display = display;
 309   xftfont_info->screen = FRAME_X_SCREEN_NUMBER (f);
 310   xftfont_info->xftfont = xftfont;
 311   font->pixel_size = size;
 312   font->driver = &xftfont_driver;
 313   if (INTEGERP (AREF (entity, FONT_SPACING_INDEX)))
 314     spacing = XINT (AREF (entity, FONT_SPACING_INDEX));
 315   else
 316     spacing = FC_PROPORTIONAL;
 317   if (! ascii_printable[0])
 318     {
 319       int i;
 320       for (i = 0; i < 95; i++)
 321         ascii_printable[i] = ' ' + i;
 322     }
 323   BLOCK_INPUT;
 324   if (spacing != FC_PROPORTIONAL)
 325     {
 326       font->min_width = font->average_width = font->space_width
 327         = xftfont->max_advance_width;
 328       XftTextExtents8 (display, xftfont, ascii_printable + 1, 94, &extents);
 329     }
 330   else
 331     {
 332       XftTextExtents8 (display, xftfont, ascii_printable, 1, &extents);
 333       font->space_width = extents.xOff;
 334       if (font->space_width <= 0)
 335         /* dirty workaround */
 336         font->space_width = pixel_size;
 337       XftTextExtents8 (display, xftfont, ascii_printable + 1, 94, &extents);
 338       font->average_width = (font->space_width + extents.xOff) / 95;
 339     }
 340   UNBLOCK_INPUT;
 341
 342   font->ascent = xftfont->ascent;
 343   font->descent = xftfont->descent;
 344   if (pixel_size >= 5)
 345     {
 346       /* The above condition is a dirty workaround because
 347          XftTextExtents8 behaves strangely for some fonts
 348          (e.g. "Dejavu Sans Mono") when pixel_size is less than 5. */
 349       if (font->ascent < extents.y)
 350         font->ascent = extents.y;
 351       if (font->descent < extents.height - extents.y)
 352         font->descent = extents.height - extents.y;
 353     }
 354   font->height = font->ascent + font->descent;
 355
 356   if (XINT (AREF (entity, FONT_SIZE_INDEX)) == 0)
 357     {
 358       int upEM = ft_face->units_per_EM;
 359
 360       font->underline_position = -ft_face->underline_position * size / upEM;
 361       font->underline_thickness = -ft_face->underline_thickness * size / upEM;
 362       if (font->underline_thickness > 2)
 363         font->underline_position -= font->underline_thickness / 2;
 364     }
 365   else
 366     {
 367       font->underline_position = -1;
 368       font->underline_thickness = 0;
 369     }
 370 #ifdef HAVE_LIBOTF
 371   xftfont_info->maybe_otf = ft_face->face_flags & FT_FACE_FLAG_SFNT;
 372   xftfont_info->otf = NULL;
 373 #endif  /* HAVE_LIBOTF */
 374   xftfont_info->ft_size = ft_face->size;
 375
 376   /* Unfortunately Xft doesn't provide a way to get minimum char
 377      width.  So, we use space_width instead.  */
 378   font->min_width = font->space_width;
 379
 380   font->baseline_offset = 0;
 381   font->relative_compose = 0;
 382   font->default_ascent = 0;
 383   font->vertical_centering = 0;
 384 #ifdef FT_BDF_H
 385   if (! (ft_face->face_flags & FT_FACE_FLAG_SFNT))
 386     {
 387       BDF_PropertyRec rec;
 388
 389       if (FT_Get_BDF_Property (ft_face, "_MULE_BASELINE_OFFSET", &rec) == 0
 390           && rec.type == BDF_PROPERTY_TYPE_INTEGER)
 391         font->baseline_offset = rec.u.integer;
 392       if (FT_Get_BDF_Property (ft_face, "_MULE_RELATIVE_COMPOSE", &rec) == 0
 393           && rec.type == BDF_PROPERTY_TYPE_INTEGER)
 394         font->relative_compose = rec.u.integer;
 395       if (FT_Get_BDF_Property (ft_face, "_MULE_DEFAULT_ASCENT", &rec) == 0
 396           && rec.type == BDF_PROPERTY_TYPE_INTEGER)
 397         font->default_ascent = rec.u.integer;
 398     }
 399 #endif
 400
 401   return font_object;
 402 }
 403
 404 static void
 405 xftfont_close (f, font)
 406      FRAME_PTR f;
 407      struct font *font;
 408 {
 409   struct xftfont_info *xftfont_info = (struct xftfont_info *) font;
 410
 411 #ifdef HAVE_LIBOTF
 412   if (xftfont_info->otf)
 413     OTF_close (xftfont_info->otf);
 414 #endif
 415   BLOCK_INPUT;
 416   XftUnlockFace (xftfont_info->xftfont);
 417   XftFontClose (xftfont_info->display, xftfont_info->xftfont);
 418   UNBLOCK_INPUT;
 419 }
 420
 421 static int
 422 xftfont_prepare_face (f, face)
 423      FRAME_PTR f;
 424      struct face *face;
 425 {
 426   struct xftface_info *xftface_info;
 427
 428 #if 0
 429   /* This doesn't work if face->ascii_face doesn't use an Xft font. */
 430   if (face != face->ascii_face)
 431     {
 432       face->extra = face->ascii_face->extra;
 433       return 0;
 434     }
 435 #endif
 436
 437   xftface_info = malloc (sizeof (struct xftface_info));
 438   if (! xftface_info)
 439     return -1;
 440   xftfont_get_colors (f, face, face->gc, NULL,
 441                       &xftface_info->xft_fg, &xftface_info->xft_bg);
 442   face->extra = xftface_info;
 443   return 0;
 444 }
 445
 446 static void
 447 xftfont_done_face (f, face)
 448      FRAME_PTR f;
 449      struct face *face;
 450 {
 451   struct xftface_info *xftface_info;
 452
 453 #if 0
 454   /* This doesn't work if face->ascii_face doesn't use an Xft font. */
 455   if (face != face->ascii_face
 456       || ! face->extra)
 457     return;
 458 #endif
 459
 460   xftface_info = (struct xftface_info *) face->extra;
 461   if (xftface_info)
 462     {
 463       free (xftface_info);
 464       face->extra = NULL;
 465     }
 466 }
 467
 468 static unsigned
 469 xftfont_encode_char (font, c)
 470      struct font *font;
 471      int c;
 472 {
 473   struct xftfont_info *xftfont_info = (struct xftfont_info *) font;
 474   unsigned code = XftCharIndex (xftfont_info->display, xftfont_info->xftfont,
 475                                 (FcChar32) c);
 476
 477   return (code ? code : FONT_INVALID_CODE);
 478 }
 479
 480 static int
 481 xftfont_text_extents (font, code, nglyphs, metrics)
 482      struct font *font;
 483      unsigned *code;
 484      int nglyphs;
 485      struct font_metrics *metrics;
 486 {
 487   struct xftfont_info *xftfont_info = (struct xftfont_info *) font;
 488   XGlyphInfo extents;
 489
 490   BLOCK_INPUT;
 491   XftGlyphExtents (xftfont_info->display, xftfont_info->xftfont, code, nglyphs,
 492                    &extents);
 493   UNBLOCK_INPUT;
 494   if (metrics)
 495     {
 496       metrics->lbearing = - extents.x;
 497       metrics->rbearing = - extents.x + extents.width;
 498       metrics->width = extents.xOff;
 499       metrics->ascent = extents.y;
 500       metrics->descent = extents.height - extents.y;
 501     }
 502   return extents.xOff;
 503 }
 504
 505 static XftDraw *
 506 xftfont_get_xft_draw (f)
 507      FRAME_PTR f;
 508 {
 509   XftDraw *xft_draw = font_get_frame_data (f, &xftfont_driver);;
 510
 511   if (! xft_draw)
 512     {
 513       BLOCK_INPUT;
 514       xft_draw= XftDrawCreate (FRAME_X_DISPLAY (f),
 515                                FRAME_X_WINDOW (f),
 516                                FRAME_X_VISUAL (f),
 517                                FRAME_X_COLORMAP (f));
 518       UNBLOCK_INPUT;
 519       if (! xft_draw)
 520         abort ();
 521       font_put_frame_data (f, &xftfont_driver, xft_draw);
 522     }
 523   return xft_draw;
 524 }
 525
 526 static int
 527 xftfont_draw (s, from, to, x, y, with_background)
 528      struct glyph_string *s;
 529      int from, to, x, y, with_background;
 530 {
 531   FRAME_PTR f = s->f;
 532   struct face *face = s->face;
 533   struct xftfont_info *xftfont_info = (struct xftfont_info *) s->font;
 534   struct xftface_info *xftface_info = NULL;
 535   XftDraw *xft_draw = xftfont_get_xft_draw (f);
 536   FT_UInt *code;
 537   XftColor fg, bg;
 538   int len = to - from;
 539   int i;
 540
 541   if (s->font == face->font)
 542     xftface_info = (struct xftface_info *) face->extra;
 543   xftfont_get_colors (f, face, s->gc, xftface_info,
 544                       &fg, with_background ? &bg : NULL);
 545   BLOCK_INPUT;
 546   if (s->num_clips > 0)
 547     XftDrawSetClipRectangles (xft_draw, 0, 0, s->clip, s->num_clips);
 548   else
 549     XftDrawSetClip (xft_draw, NULL);
 550
 551   if (with_background)
 552     XftDrawRect (xft_draw, &bg,
 553                  x, y - face->font->ascent, s->width, face->font->height);
 554   code = alloca (sizeof (FT_UInt) * len);
 555   for (i = 0; i < len; i++)
 556     code[i] = ((XCHAR2B_BYTE1 (s->char2b + from + i) << 8)
 557                | XCHAR2B_BYTE2 (s->char2b + from + i));
 558
 559   if (s->padding_p)
 560     for (i = 0; i < len; i++)
 561       XftDrawGlyphs (xft_draw, &fg, xftfont_info->xftfont,
 562                      x + i, y, code + i, 1);
 563   else
 564     XftDrawGlyphs (xft_draw, &fg, xftfont_info->xftfont,
 565                    x, y, code, len);
 566   UNBLOCK_INPUT;
 567
 568   return len;
 569 }
 570
 571 static int
 572 xftfont_end_for_frame (f)
 573      FRAME_PTR f;
 574 {
 575   XftDraw *xft_draw = font_get_frame_data (f, &xftfont_driver);
 576
 577   if (xft_draw)
 578     {
 579       BLOCK_INPUT;
 580       XftDrawDestroy (xft_draw);
 581       UNBLOCK_INPUT;
 582       font_put_frame_data (f, &xftfont_driver, NULL);
 583     }
 584   return 0;
 585 }
 586
 587 void
 588 syms_of_xftfont ()
 589 {
 590   DEFSYM (Qxft, "xft");
 591   DEFSYM (QChinting, ":hinting");
 592   DEFSYM (QCautohint, ":autohint");
 593   DEFSYM (QChintstyle, ":hintstyle");
 594   DEFSYM (QCrgba, ":rgba");
 595   DEFSYM (QCembolden, ":embolden");
 596
 597   xftfont_driver = ftfont_driver;
 598   xftfont_driver.type = Qxft;
 599   xftfont_driver.get_cache = xfont_driver.get_cache;
 600   xftfont_driver.list = xftfont_list;
 601   xftfont_driver.match = xftfont_match;
 602   xftfont_driver.open = xftfont_open;
 603   xftfont_driver.close = xftfont_close;
 604   xftfont_driver.prepare_face = xftfont_prepare_face;
 605   xftfont_driver.done_face = xftfont_done_face;
 606   xftfont_driver.encode_char = xftfont_encode_char;
 607   xftfont_driver.text_extents = xftfont_text_extents;
 608   xftfont_driver.draw = xftfont_draw;
 609   xftfont_driver.end_for_frame = xftfont_end_for_frame;
 610
 611   register_font_driver (&xftfont_driver, NULL);
 612 }
 613
 614 /* arch-tag: 64ec61bf-7c8e-4fe6-b953-c6a85d5e1605
 615    (do not change this comment) */