src/xftfont.c

   1 /* xftfont.c -- XFT font driver.
   2    Copyright (C) 2006-2014 Free Software Foundation, Inc.
   3    Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011
   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 "composite.h"
  35 #include "fontset.h"
  36 #include "font.h"
  37 #include "ftfont.h"
  38
  39 /* Xft font driver.  */
  40
  41 Lisp_Object Qxft;
  42 static Lisp_Object QChinting, QCautohint, QChintstyle, QCrgba, QCembolden,
  43   QClcdfilter;
  44
  45 /* The actual structure for Xft font that can be casted to struct
  46    font.  */
  47
  48 struct xftfont_info
  49 {
  50   struct font font;
  51   /* The following five members must be here in this order to be
  52      compatible with struct ftfont_info (in ftfont.c).  */
  53 #ifdef HAVE_LIBOTF
  54   bool maybe_otf;         /* Flag to tell if this may be OTF or not.  */
  55   OTF *otf;
  56 #endif  /* HAVE_LIBOTF */
  57   FT_Size ft_size;
  58   int index;
  59   FT_Matrix matrix;
  60   Display *display;
  61   XftFont *xftfont;
  62 };
  63
  64 /* Structure pointed by (struct face *)->extra  */
  65
  66 struct xftface_info
  67 {
  68   XftColor xft_fg;              /* color for face->foreground */
  69   XftColor xft_bg;              /* color for face->background */
  70 };
  71
  72 /* Setup foreground and background colors of GC into FG and BG.  If
  73    XFTFACE_INFO is not NULL, reuse the colors in it if possible.  BG
  74    may be NULL.  */
  75
  76 static void
  77 xftfont_get_colors (struct frame *f, struct face *face, GC gc,
  78                     struct xftface_info *xftface_info,
  79                     XftColor *fg, XftColor *bg)
  80 {
  81   if (xftface_info && face->gc == gc)
  82     {
  83       *fg = xftface_info->xft_fg;
  84       if (bg)
  85         *bg = xftface_info->xft_bg;
  86     }
  87   else
  88     {
  89       XGCValues xgcv;
  90       bool fg_done = 0, bg_done = 0;
  91
  92       block_input ();
  93       XGetGCValues (FRAME_X_DISPLAY (f), gc,
  94                     GCForeground | GCBackground, &xgcv);
  95       if (xftface_info)
  96         {
  97           if (xgcv.foreground == face->foreground)
  98             *fg = xftface_info->xft_fg, fg_done = 1;
  99           else if (xgcv.foreground == face->background)
 100             *fg = xftface_info->xft_bg, fg_done = 1;
 101           if (! bg)
 102             bg_done = 1;
 103           else if (xgcv.background == face->background)
 104             *bg = xftface_info->xft_bg, bg_done = 1;
 105           else if (xgcv.background == face->foreground)
 106             *bg = xftface_info->xft_fg, bg_done = 1;
 107         }
 108
 109       if (! (fg_done & bg_done))
 110         {
 111           XColor colors[2];
 112
 113           colors[0].pixel = fg->pixel = xgcv.foreground;
 114           if (bg)
 115             colors[1].pixel = bg->pixel = xgcv.background;
 116           XQueryColors (FRAME_X_DISPLAY (f), FRAME_X_COLORMAP (f), colors,
 117                         bg ? 2 : 1);
 118           fg->color.alpha = 0xFFFF;
 119           fg->color.red = colors[0].red;
 120           fg->color.green = colors[0].green;
 121           fg->color.blue = colors[0].blue;
 122           if (bg)
 123             {
 124               bg->color.alpha = 0xFFFF;
 125               bg->color.red = colors[1].red;
 126               bg->color.green = colors[1].green;
 127               bg->color.blue = colors[1].blue;
 128             }
 129         }
 130       unblock_input ();
 131     }
 132 }
 133
 134
 135 struct font_driver xftfont_driver;
 136
 137 static Lisp_Object
 138 xftfont_list (struct frame *f, Lisp_Object spec)
 139 {
 140   Lisp_Object list = ftfont_driver.list (f, spec), tail;
 141
 142   for (tail = list; CONSP (tail); tail = XCDR (tail))
 143     ASET (XCAR (tail), FONT_TYPE_INDEX, Qxft);
 144   return list;
 145 }
 146
 147 static Lisp_Object
 148 xftfont_match (struct frame *f, Lisp_Object spec)
 149 {
 150   Lisp_Object entity = ftfont_driver.match (f, spec);
 151
 152   if (! NILP (entity))
 153     ASET (entity, FONT_TYPE_INDEX, Qxft);
 154   return entity;
 155 }
 156
 157 static FcChar8 ascii_printable[95];
 158
 159 static void
 160 xftfont_fix_match (FcPattern *pat, FcPattern *match)
 161 {
 162   /*  These values are not used for matching (except antialias), but for
 163       rendering, so make sure they are carried over to the match.
 164       We also put antialias here because most fonts are antialiased, so
 165       the match will have antialias true.  */
 166
 167   FcBool b = FcTrue;
 168   int i;
 169   double dpi;
 170
 171   FcPatternGetBool (pat, FC_ANTIALIAS, 0, &b);
 172   if (! b)
 173     {
 174       FcPatternDel (match, FC_ANTIALIAS);
 175       FcPatternAddBool (match, FC_ANTIALIAS, FcFalse);
 176     }
 177   FcPatternGetBool (pat, FC_HINTING, 0, &b);
 178   if (! b)
 179     {
 180       FcPatternDel (match, FC_HINTING);
 181       FcPatternAddBool (match, FC_HINTING, FcFalse);
 182     }
 183 #ifndef FC_HINT_STYLE
 184 # define FC_HINT_STYLE "hintstyle"
 185 #endif
 186   if (FcResultMatch == FcPatternGetInteger (pat, FC_HINT_STYLE, 0, &i))
 187     {
 188       FcPatternDel (match, FC_HINT_STYLE);
 189       FcPatternAddInteger (match, FC_HINT_STYLE, i);
 190     }
 191 #ifndef FC_LCD_FILTER
 192   /* Older fontconfig versions don't have FC_LCD_FILTER. */
 193 #define FC_LCD_FILTER "lcdfilter"
 194 #endif
 195   if (FcResultMatch == FcPatternGetInteger (pat, FC_LCD_FILTER, 0, &i))
 196     {
 197       FcPatternDel (match, FC_LCD_FILTER);
 198       FcPatternAddInteger (match, FC_LCD_FILTER, i);
 199     }
 200   if (FcResultMatch == FcPatternGetInteger (pat, FC_RGBA, 0, &i))
 201     {
 202       FcPatternDel (match, FC_RGBA);
 203       FcPatternAddInteger (match, FC_RGBA, i);
 204     }
 205   if (FcResultMatch == FcPatternGetDouble (pat, FC_DPI, 0, &dpi))
 206     {
 207       FcPatternDel (match, FC_DPI);
 208       FcPatternAddDouble (match, FC_DPI, dpi);
 209     }
 210 }
 211
 212 static void
 213 xftfont_add_rendering_parameters (FcPattern *pat, Lisp_Object entity)
 214 {
 215   Lisp_Object tail;
 216   int ival;
 217
 218   for (tail = AREF (entity, FONT_EXTRA_INDEX); CONSP (tail); tail = XCDR (tail))
 219     {
 220       Lisp_Object key = XCAR (XCAR (tail));
 221       Lisp_Object val = XCDR (XCAR (tail));
 222
 223       if (EQ (key, QCantialias))
 224           FcPatternAddBool (pat, FC_ANTIALIAS, NILP (val) ? FcFalse : FcTrue);
 225       else if (EQ (key, QChinting))
 226         FcPatternAddBool (pat, FC_HINTING, NILP (val) ? FcFalse : FcTrue);
 227       else if (EQ (key, QCautohint))
 228         FcPatternAddBool (pat, FC_AUTOHINT, NILP (val) ? FcFalse : FcTrue);
 229       else if (EQ (key, QChintstyle))
 230         {
 231           if (INTEGERP (val))
 232             FcPatternAddInteger (pat, FC_HINT_STYLE, XINT (val));
 233           else if (SYMBOLP (val)
 234                    && FcNameConstant (SDATA (SYMBOL_NAME (val)), &ival))
 235             FcPatternAddInteger (pat, FC_HINT_STYLE, ival);
 236         }
 237       else if (EQ (key, QCrgba))
 238         {
 239           if (INTEGERP (val))
 240             FcPatternAddInteger (pat, FC_RGBA, XINT (val));
 241           else if (SYMBOLP (val)
 242                    && FcNameConstant (SDATA (SYMBOL_NAME (val)), &ival))
 243             FcPatternAddInteger (pat, FC_RGBA, ival);
 244         }
 245       else if (EQ (key, QClcdfilter))
 246         {
 247           if (INTEGERP (val))
 248             FcPatternAddInteger (pat, FC_LCD_FILTER, ival = XINT (val));
 249           else if (SYMBOLP (val)
 250                    && FcNameConstant (SDATA (SYMBOL_NAME (val)), &ival))
 251             FcPatternAddInteger (pat, FC_LCD_FILTER, ival);
 252         }
 253 #ifdef FC_EMBOLDEN
 254       else if (EQ (key, QCembolden))
 255         FcPatternAddBool (pat, FC_EMBOLDEN, NILP (val) ? FcFalse : FcTrue);
 256 #endif
 257     }
 258 }
 259
 260 static Lisp_Object
 261 xftfont_open (struct frame *f, Lisp_Object entity, int pixel_size)
 262 {
 263   FcResult result;
 264   Display *display = FRAME_X_DISPLAY (f);
 265   Lisp_Object val, filename, idx, font_object;
 266   FcPattern *pat = NULL, *match;
 267   struct xftfont_info *xftfont_info = NULL;
 268   struct font *font;
 269   double size = 0;
 270   XftFont *xftfont = NULL;
 271   int spacing;
 272   char name[256];
 273   int len, i;
 274   XGlyphInfo extents;
 275   FT_Face ft_face;
 276   FcMatrix *matrix;
 277
 278   val = assq_no_quit (QCfont_entity, AREF (entity, FONT_EXTRA_INDEX));
 279   if (! CONSP (val))
 280     return Qnil;
 281   val = XCDR (val);
 282   filename = XCAR (val);
 283   idx = XCDR (val);
 284   size = XINT (AREF (entity, FONT_SIZE_INDEX));
 285   if (size == 0)
 286     size = pixel_size;
 287   pat = FcPatternCreate ();
 288   FcPatternAddInteger (pat, FC_WEIGHT, FONT_WEIGHT_NUMERIC (entity));
 289   i = FONT_SLANT_NUMERIC (entity) - 100;
 290   if (i < 0) i = 0;
 291   FcPatternAddInteger (pat, FC_SLANT, i);
 292   FcPatternAddInteger (pat, FC_WIDTH, FONT_WIDTH_NUMERIC (entity));
 293   FcPatternAddDouble (pat, FC_PIXEL_SIZE, pixel_size);
 294   val = AREF (entity, FONT_FAMILY_INDEX);
 295   if (! NILP (val))
 296     FcPatternAddString (pat, FC_FAMILY, (FcChar8 *) SDATA (SYMBOL_NAME (val)));
 297   val = AREF (entity, FONT_FOUNDRY_INDEX);
 298   if (! NILP (val))
 299     FcPatternAddString (pat, FC_FOUNDRY, (FcChar8 *) SDATA (SYMBOL_NAME (val)));
 300   val = AREF (entity, FONT_SPACING_INDEX);
 301   if (! NILP (val))
 302     FcPatternAddInteger (pat, FC_SPACING, XINT (val));
 303   val = AREF (entity, FONT_DPI_INDEX);
 304   if (! NILP (val))
 305     {
 306       double dbl = XINT (val);
 307
 308       FcPatternAddDouble (pat, FC_DPI, dbl);
 309     }
 310   val = AREF (entity, FONT_AVGWIDTH_INDEX);
 311   if (INTEGERP (val) && XINT (val) == 0)
 312     FcPatternAddBool (pat, FC_SCALABLE, FcTrue);
 313   /* This is necessary to identify the exact font (e.g. 10x20.pcf.gz
 314      over 10x20-ISO8859-1.pcf.gz).  */
 315   FcPatternAddCharSet (pat, FC_CHARSET, ftfont_get_fc_charset (entity));
 316
 317   xftfont_add_rendering_parameters (pat, entity);
 318
 319   FcPatternAddString (pat, FC_FILE, (FcChar8 *) SDATA (filename));
 320   FcPatternAddInteger (pat, FC_INDEX, XINT (idx));
 321
 322
 323   block_input ();
 324   /* Make sure that the Xrender extension is added before the Xft one.
 325      Otherwise, the close-display hook set by Xft is called after the
 326      one for Xrender, and the former tries to re-add the latter.  This
 327      results in inconsistency of internal states and leads to X
 328      protocol error when one reconnects to the same X server.
 329      (Bug#1696)  */
 330   {
 331     int event_base, error_base;
 332     XRenderQueryExtension (display, &event_base, &error_base);
 333   }
 334
 335   /* Substitute in values from X resources and XftDefaultSet.  */
 336   XftDefaultSubstitute (display, FRAME_X_SCREEN_NUMBER (f), pat);
 337   match = XftFontMatch (display, FRAME_X_SCREEN_NUMBER (f), pat, &result);
 338   xftfont_fix_match (pat, match);
 339
 340   FcPatternDestroy (pat);
 341   xftfont = XftFontOpenPattern (display, match);
 342   if (!xftfont)
 343     {
 344       unblock_input ();
 345       XftPatternDestroy (match);
 346       return Qnil;
 347     }
 348   ft_face = XftLockFace (xftfont);
 349   unblock_input ();
 350
 351   /* We should not destroy PAT here because it is kept in XFTFONT and
 352      destroyed automatically when XFTFONT is closed.  */
 353   font_object = font_make_object (VECSIZE (struct xftfont_info), entity, size);
 354   ASET (font_object, FONT_TYPE_INDEX, Qxft);
 355   len = font_unparse_xlfd (entity, size, name, 256);
 356   if (len > 0)
 357     ASET (font_object, FONT_NAME_INDEX, make_string (name, len));
 358   len = font_unparse_fcname (entity, size, name, 256);
 359   if (len > 0)
 360     ASET (font_object, FONT_FULLNAME_INDEX, make_string (name, len));
 361   else
 362     ASET (font_object, FONT_FULLNAME_INDEX,
 363           AREF (font_object, FONT_NAME_INDEX));
 364   ASET (font_object, FONT_FILE_INDEX, filename);
 365   ASET (font_object, FONT_FORMAT_INDEX,
 366         ftfont_font_format (xftfont->pattern, filename));
 367   font = XFONT_OBJECT (font_object);
 368   font->pixel_size = size;
 369   font->driver = &xftfont_driver;
 370   font->encoding_charset = font->repertory_charset = -1;
 371
 372   xftfont_info = (struct xftfont_info *) font;
 373   xftfont_info->display = display;
 374   xftfont_info->xftfont = xftfont;
 375   /* This means that there's no need of transformation.  */
 376   xftfont_info->matrix.xx = 0;
 377   if (FcPatternGetMatrix (xftfont->pattern, FC_MATRIX, 0, &matrix)
 378       == FcResultMatch)
 379     {
 380       xftfont_info->matrix.xx = 0x10000L * matrix->xx;
 381       xftfont_info->matrix.yy = 0x10000L * matrix->yy;
 382       xftfont_info->matrix.xy = 0x10000L * matrix->xy;
 383       xftfont_info->matrix.yx = 0x10000L * matrix->yx;
 384     }
 385   if (INTEGERP (AREF (entity, FONT_SPACING_INDEX)))
 386     spacing = XINT (AREF (entity, FONT_SPACING_INDEX));
 387   else
 388     spacing = FC_PROPORTIONAL;
 389   if (! ascii_printable[0])
 390     {
 391       int ch;
 392       for (ch = 0; ch < 95; ch++)
 393         ascii_printable[ch] = ' ' + ch;
 394     }
 395   block_input ();
 396
 397   /* Unfortunately Xft doesn't provide a way to get minimum char
 398      width.  So, we set min_width to space_width.  */
 399
 400   if (spacing != FC_PROPORTIONAL
 401 #ifdef FC_DUAL
 402       && spacing != FC_DUAL
 403 #endif  /* FC_DUAL */
 404       )
 405     {
 406       font->min_width = font->max_width = font->average_width
 407         = font->space_width = xftfont->max_advance_width;
 408       XftTextExtents8 (display, xftfont, ascii_printable + 1, 94, &extents);
 409     }
 410   else
 411     {
 412       XftTextExtents8 (display, xftfont, ascii_printable, 1, &extents);
 413       font->min_width = font->max_width = font->space_width
 414         = extents.xOff;
 415       if (font->space_width <= 0)
 416         /* dirty workaround */
 417         font->space_width = pixel_size;
 418       XftTextExtents8 (display, xftfont, ascii_printable + 1, 94, &extents);
 419       font->average_width = (font->space_width + extents.xOff) / 95;
 420     }
 421   unblock_input ();
 422
 423   font->ascent = xftfont->ascent;
 424   font->descent = xftfont->descent;
 425   if (pixel_size >= 5)
 426     {
 427       /* The above condition is a dirty workaround because
 428          XftTextExtents8 behaves strangely for some fonts
 429          (e.g. "Dejavu Sans Mono") when pixel_size is less than 5. */
 430       if (font->ascent < extents.y)
 431         font->ascent = extents.y;
 432       if (font->descent < extents.height - extents.y)
 433         font->descent = extents.height - extents.y;
 434     }
 435   font->height = font->ascent + font->descent;
 436
 437   if (XINT (AREF (entity, FONT_SIZE_INDEX)) == 0)
 438     {
 439       int upEM = ft_face->units_per_EM;
 440
 441       font->underline_position = -ft_face->underline_position * size / upEM;
 442       font->underline_thickness = ft_face->underline_thickness * size / upEM;
 443       if (font->underline_thickness > 2)
 444         font->underline_position -= font->underline_thickness / 2;
 445     }
 446   else
 447     {
 448       font->underline_position = -1;
 449       font->underline_thickness = 0;
 450     }
 451 #ifdef HAVE_LIBOTF
 452   xftfont_info->maybe_otf = (ft_face->face_flags & FT_FACE_FLAG_SFNT) != 0;
 453   xftfont_info->otf = NULL;
 454 #endif  /* HAVE_LIBOTF */
 455   xftfont_info->ft_size = ft_face->size;
 456
 457   font->baseline_offset = 0;
 458   font->relative_compose = 0;
 459   font->default_ascent = 0;
 460   font->vertical_centering = 0;
 461 #ifdef FT_BDF_H
 462   if (! (ft_face->face_flags & FT_FACE_FLAG_SFNT))
 463     {
 464       BDF_PropertyRec rec;
 465
 466       if (FT_Get_BDF_Property (ft_face, "_MULE_BASELINE_OFFSET", &rec) == 0
 467           && rec.type == BDF_PROPERTY_TYPE_INTEGER)
 468         font->baseline_offset = rec.u.integer;
 469       if (FT_Get_BDF_Property (ft_face, "_MULE_RELATIVE_COMPOSE", &rec) == 0
 470           && rec.type == BDF_PROPERTY_TYPE_INTEGER)
 471         font->relative_compose = rec.u.integer;
 472       if (FT_Get_BDF_Property (ft_face, "_MULE_DEFAULT_ASCENT", &rec) == 0
 473           && rec.type == BDF_PROPERTY_TYPE_INTEGER)
 474         font->default_ascent = rec.u.integer;
 475     }
 476 #endif
 477
 478   return font_object;
 479 }
 480
 481 static void
 482 xftfont_close (struct font *font)
 483 {
 484   struct xftfont_info *xftfont_info = (struct xftfont_info *) font;
 485
 486 #ifdef HAVE_LIBOTF
 487   if (xftfont_info->otf)
 488     {
 489       OTF_close (xftfont_info->otf);
 490       xftfont_info->otf = NULL;
 491     }
 492 #endif
 493
 494   /* See comment in xfont_close.  */
 495   if (xftfont_info->xftfont
 496       && x_display_info_for_display (xftfont_info->display))
 497     {
 498       block_input ();
 499       XftUnlockFace (xftfont_info->xftfont);
 500       XftFontClose (xftfont_info->display, xftfont_info->xftfont);
 501       unblock_input ();
 502       xftfont_info->xftfont = NULL;
 503     }
 504 }
 505
 506 static int
 507 xftfont_prepare_face (struct frame *f, struct face *face)
 508 {
 509   struct xftface_info *xftface_info;
 510
 511 #if 0
 512   /* This doesn't work if face->ascii_face doesn't use an Xft font. */
 513   if (face != face->ascii_face)
 514     {
 515       face->extra = face->ascii_face->extra;
 516       return 0;
 517     }
 518 #endif
 519
 520   xftface_info = malloc (sizeof *xftface_info);
 521   if (! xftface_info)
 522     return -1;
 523   xftfont_get_colors (f, face, face->gc, NULL,
 524                       &xftface_info->xft_fg, &xftface_info->xft_bg);
 525   face->extra = xftface_info;
 526   return 0;
 527 }
 528
 529 static void
 530 xftfont_done_face (struct frame *f, struct face *face)
 531 {
 532   struct xftface_info *xftface_info;
 533
 534 #if 0
 535   /* This doesn't work if face->ascii_face doesn't use an Xft font. */
 536   if (face != face->ascii_face
 537       || ! face->extra)
 538     return;
 539 #endif
 540
 541   xftface_info = (struct xftface_info *) face->extra;
 542   if (xftface_info)
 543     {
 544       free (xftface_info);
 545       face->extra = NULL;
 546     }
 547 }
 548
 549 static int
 550 xftfont_has_char (Lisp_Object font, int c)
 551 {
 552   struct xftfont_info *xftfont_info;
 553   struct charset *cs = NULL;
 554
 555   if (EQ (AREF (font, FONT_ADSTYLE_INDEX), Qja)
 556       && charset_jisx0208 >= 0)
 557     cs = CHARSET_FROM_ID (charset_jisx0208);
 558   else if (EQ (AREF (font, FONT_ADSTYLE_INDEX), Qko)
 559       && charset_ksc5601 >= 0)
 560     cs = CHARSET_FROM_ID (charset_ksc5601);
 561   if (cs)
 562     return (ENCODE_CHAR (cs, c) != CHARSET_INVALID_CODE (cs));
 563
 564   if (FONT_ENTITY_P (font))
 565     return ftfont_driver.has_char (font, c);
 566   xftfont_info = (struct xftfont_info *) XFONT_OBJECT (font);
 567   return (XftCharExists (xftfont_info->display, xftfont_info->xftfont,
 568                          (FcChar32) c) == FcTrue);
 569 }
 570
 571 static unsigned
 572 xftfont_encode_char (struct font *font, int c)
 573 {
 574   struct xftfont_info *xftfont_info = (struct xftfont_info *) font;
 575   unsigned code = XftCharIndex (xftfont_info->display, xftfont_info->xftfont,
 576                                 (FcChar32) c);
 577
 578   return (code ? code : FONT_INVALID_CODE);
 579 }
 580
 581 static int
 582 xftfont_text_extents (struct font *font, unsigned int *code, int nglyphs, struct font_metrics *metrics)
 583 {
 584   struct xftfont_info *xftfont_info = (struct xftfont_info *) font;
 585   XGlyphInfo extents;
 586
 587   block_input ();
 588   XftGlyphExtents (xftfont_info->display, xftfont_info->xftfont, code, nglyphs,
 589                    &extents);
 590   unblock_input ();
 591   if (metrics)
 592     {
 593       metrics->lbearing = - extents.x;
 594       metrics->rbearing = - extents.x + extents.width;
 595       metrics->width = extents.xOff;
 596       metrics->ascent = extents.y;
 597       metrics->descent = extents.height - extents.y;
 598     }
 599   return extents.xOff;
 600 }
 601
 602 static XftDraw *
 603 xftfont_get_xft_draw (struct frame *f)
 604 {
 605   XftDraw *xft_draw = font_get_frame_data (f, &xftfont_driver);
 606
 607   if (! xft_draw)
 608     {
 609       block_input ();
 610       xft_draw= XftDrawCreate (FRAME_X_DISPLAY (f),
 611                                FRAME_X_WINDOW (f),
 612                                FRAME_X_VISUAL (f),
 613                                FRAME_X_COLORMAP (f));
 614       unblock_input ();
 615       eassert (xft_draw != NULL);
 616       font_put_frame_data (f, &xftfont_driver, xft_draw);
 617     }
 618   return xft_draw;
 619 }
 620
 621 static int
 622 xftfont_draw (struct glyph_string *s, int from, int to, int x, int y,
 623               bool with_background)
 624 {
 625   struct frame *f = s->f;
 626   struct face *face = s->face;
 627   struct xftfont_info *xftfont_info = (struct xftfont_info *) s->font;
 628   struct xftface_info *xftface_info = NULL;
 629   XftDraw *xft_draw = xftfont_get_xft_draw (f);
 630   FT_UInt *code;
 631   XftColor fg, bg;
 632   int len = to - from;
 633   int i;
 634
 635   if (s->font == face->font)
 636     xftface_info = (struct xftface_info *) face->extra;
 637   xftfont_get_colors (f, face, s->gc, xftface_info,
 638                       &fg, with_background ? &bg : NULL);
 639   block_input ();
 640   if (s->num_clips > 0)
 641     XftDrawSetClipRectangles (xft_draw, 0, 0, s->clip, s->num_clips);
 642   else
 643     XftDrawSetClip (xft_draw, NULL);
 644
 645   if (with_background)
 646     XftDrawRect (xft_draw, &bg,
 647                  x, y - s->font->ascent, s->width, s->font->height);
 648   code = alloca (sizeof (FT_UInt) * len);
 649   for (i = 0; i < len; i++)
 650     code[i] = ((XCHAR2B_BYTE1 (s->char2b + from + i) << 8)
 651                | XCHAR2B_BYTE2 (s->char2b + from + i));
 652
 653   if (s->padding_p)
 654     for (i = 0; i < len; i++)
 655       XftDrawGlyphs (xft_draw, &fg, xftfont_info->xftfont,
 656                      x + i, y, code + i, 1);
 657   else
 658     XftDrawGlyphs (xft_draw, &fg, xftfont_info->xftfont,
 659                    x, y, code, len);
 660   unblock_input ();
 661
 662   return len;
 663 }
 664
 665 #if defined HAVE_M17N_FLT && defined HAVE_LIBOTF
 666 static Lisp_Object
 667 xftfont_shape (Lisp_Object lgstring)
 668 {
 669   struct font *font;
 670   struct xftfont_info *xftfont_info;
 671   FT_Face ft_face;
 672   Lisp_Object val;
 673
 674   CHECK_FONT_GET_OBJECT (LGSTRING_FONT (lgstring), font);
 675   xftfont_info = (struct xftfont_info *) font;
 676   ft_face = XftLockFace (xftfont_info->xftfont);
 677   xftfont_info->ft_size = ft_face->size;
 678   val = ftfont_driver.shape (lgstring);
 679   XftUnlockFace (xftfont_info->xftfont);
 680   return val;
 681 }
 682 #endif
 683
 684 static int
 685 xftfont_end_for_frame (struct frame *f)
 686 {
 687   XftDraw *xft_draw;
 688
 689   /* Don't do anything if display is dead */
 690   if (FRAME_X_DISPLAY (f) == NULL) return 0;
 691
 692   xft_draw = font_get_frame_data (f, &xftfont_driver);
 693
 694   if (xft_draw)
 695     {
 696       block_input ();
 697       XftDrawDestroy (xft_draw);
 698       unblock_input ();
 699       font_put_frame_data (f, &xftfont_driver, NULL);
 700     }
 701   return 0;
 702 }
 703
 704 static bool
 705 xftfont_cached_font_ok (struct frame *f, Lisp_Object font_object,
 706                         Lisp_Object entity)
 707 {
 708   struct xftfont_info *info = (struct xftfont_info *) XFONT_OBJECT (font_object);
 709   FcPattern *oldpat = info->xftfont->pattern;
 710   Display *display = FRAME_X_DISPLAY (f);
 711   FcPattern *pat = FcPatternCreate ();
 712   FcBool b1, b2;
 713   bool ok = 0;
 714   int i1, i2, r1, r2;
 715
 716   xftfont_add_rendering_parameters (pat, entity);
 717   XftDefaultSubstitute (display, FRAME_X_SCREEN_NUMBER (f), pat);
 718
 719   r1 = FcPatternGetBool (pat, FC_ANTIALIAS, 0, &b1);
 720   r2 = FcPatternGetBool (oldpat, FC_ANTIALIAS, 0, &b2);
 721   if (r1 != r2 || b1 != b2) goto out;
 722   r1 = FcPatternGetBool (pat, FC_HINTING, 0, &b1);
 723   r2 = FcPatternGetBool (oldpat, FC_HINTING, 0, &b2);
 724   if (r1 != r2 || b1 != b2) goto out;
 725   r1 = FcPatternGetBool (pat, FC_AUTOHINT, 0, &b1);
 726   r2 = FcPatternGetBool (oldpat, FC_AUTOHINT, 0, &b2);
 727   if (r1 != r2 || b1 != b2) goto out;
 728 #ifdef FC_EMBOLDEN
 729   r1 = FcPatternGetBool (pat, FC_EMBOLDEN, 0, &b1);
 730   r2 = FcPatternGetBool (oldpat, FC_EMBOLDEN, 0, &b2);
 731   if (r1 != r2 || b1 != b2) goto out;
 732 #endif
 733   r1 = FcPatternGetInteger (pat, FC_HINT_STYLE, 0, &i1);
 734   r2 = FcPatternGetInteger (oldpat, FC_HINT_STYLE, 0, &i2);
 735   if (r1 != r2 || i1 != i2) goto out;
 736   r1 = FcPatternGetInteger (pat, FC_LCD_FILTER, 0, &i1);
 737   r2 = FcPatternGetInteger (oldpat, FC_LCD_FILTER, 0, &i2);
 738   if (r1 != r2 || i1 != i2) goto out;
 739   r1 = FcPatternGetInteger (pat, FC_RGBA, 0, &i1);
 740   r2 = FcPatternGetInteger (oldpat, FC_RGBA, 0, &i2);
 741   if (r1 != r2 || i1 != i2) goto out;
 742
 743   ok = 1;
 744  out:
 745   FcPatternDestroy (pat);
 746   return ok;
 747 }
 748
 749 void
 750 syms_of_xftfont (void)
 751 {
 752   DEFSYM (Qxft, "xft");
 753   DEFSYM (QChinting, ":hinting");
 754   DEFSYM (QCautohint, ":autohint");
 755   DEFSYM (QChintstyle, ":hintstyle");
 756   DEFSYM (QCrgba, ":rgba");
 757   DEFSYM (QCembolden, ":embolden");
 758   DEFSYM (QClcdfilter, ":lcdfilter");
 759
 760   ascii_printable[0] = 0;
 761
 762   xftfont_driver = ftfont_driver;
 763   xftfont_driver.type = Qxft;
 764   xftfont_driver.get_cache = xfont_driver.get_cache;
 765   xftfont_driver.list = xftfont_list;
 766   xftfont_driver.match = xftfont_match;
 767   xftfont_driver.open = xftfont_open;
 768   xftfont_driver.close = xftfont_close;
 769   xftfont_driver.prepare_face = xftfont_prepare_face;
 770   xftfont_driver.done_face = xftfont_done_face;
 771   xftfont_driver.has_char = xftfont_has_char;
 772   xftfont_driver.encode_char = xftfont_encode_char;
 773   xftfont_driver.text_extents = xftfont_text_extents;
 774   xftfont_driver.draw = xftfont_draw;
 775   xftfont_driver.end_for_frame = xftfont_end_for_frame;
 776   xftfont_driver.cached_font_ok = xftfont_cached_font_ok;
 777 #if defined (HAVE_M17N_FLT) && defined (HAVE_LIBOTF)
 778   xftfont_driver.shape = xftfont_shape;
 779 #endif
 780
 781   register_font_driver (&xftfont_driver, NULL);
 782 }