src/xftfont.c

   1 /* xftfont.c -- XFT font driver.
   2    Copyright (C) 2006-2013 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   int screen;
  62   XftFont *xftfont;
  63 };
  64
  65 /* Structure pointed by (struct face *)->extra  */
  66
  67 struct xftface_info
  68 {
  69   XftColor xft_fg;              /* color for face->foreground */
  70   XftColor xft_bg;              /* color for face->background */
  71 };
  72
  73 static void xftfont_get_colors (FRAME_PTR, struct face *, GC gc,
  74                                 struct xftface_info *,
  75                                 XftColor *fg, XftColor *bg);
  76
  77
  78 /* Setup foreground and background colors of GC into FG and BG.  If
  79    XFTFACE_INFO is not NULL, reuse the colors in it if possible.  BG
  80    may be NULL.  */
  81
  82 static void
  83 xftfont_get_colors (FRAME_PTR f, struct face *face, GC gc, struct xftface_info *xftface_info, XftColor *fg, XftColor *bg)
  84 {
  85   if (xftface_info && face->gc == gc)
  86     {
  87       *fg = xftface_info->xft_fg;
  88       if (bg)
  89         *bg = xftface_info->xft_bg;
  90     }
  91   else
  92     {
  93       XGCValues xgcv;
  94       bool fg_done = 0, bg_done = 0;
  95
  96       block_input ();
  97       XGetGCValues (FRAME_X_DISPLAY (f), gc,
  98                     GCForeground | GCBackground, &xgcv);
  99       if (xftface_info)
 100         {
 101           if (xgcv.foreground == face->foreground)
 102             *fg = xftface_info->xft_fg, fg_done = 1;
 103           else if (xgcv.foreground == face->background)
 104             *fg = xftface_info->xft_bg, fg_done = 1;
 105           if (! bg)
 106             bg_done = 1;
 107           else if (xgcv.background == face->background)
 108             *bg = xftface_info->xft_bg, bg_done = 1;
 109           else if (xgcv.background == face->foreground)
 110             *bg = xftface_info->xft_fg, bg_done = 1;
 111         }
 112
 113       if (! (fg_done & bg_done))
 114         {
 115           XColor colors[2];
 116
 117           colors[0].pixel = fg->pixel = xgcv.foreground;
 118           if (bg)
 119             colors[1].pixel = bg->pixel = xgcv.background;
 120           XQueryColors (FRAME_X_DISPLAY (f), FRAME_X_COLORMAP (f), colors,
 121                         bg ? 2 : 1);
 122           fg->color.alpha = 0xFFFF;
 123           fg->color.red = colors[0].red;
 124           fg->color.green = colors[0].green;
 125           fg->color.blue = colors[0].blue;
 126           if (bg)
 127             {
 128               bg->color.alpha = 0xFFFF;
 129               bg->color.red = colors[1].red;
 130               bg->color.green = colors[1].green;
 131               bg->color.blue = colors[1].blue;
 132             }
 133         }
 134       unblock_input ();
 135     }
 136 }
 137
 138
 139 struct font_driver xftfont_driver;
 140
 141 static Lisp_Object
 142 xftfont_list (Lisp_Object frame, Lisp_Object spec)
 143 {
 144   Lisp_Object list = ftfont_driver.list (frame, spec), tail;
 145
 146   for (tail = list; CONSP (tail); tail = XCDR (tail))
 147     ASET (XCAR (tail), FONT_TYPE_INDEX, Qxft);
 148   return list;
 149 }
 150
 151 static Lisp_Object
 152 xftfont_match (Lisp_Object frame, Lisp_Object spec)
 153 {
 154   Lisp_Object entity = ftfont_driver.match (frame, spec);
 155
 156   if (! NILP (entity))
 157     ASET (entity, FONT_TYPE_INDEX, Qxft);
 158   return entity;
 159 }
 160
 161 static FcChar8 ascii_printable[95];
 162
 163 static void
 164 xftfont_fix_match (FcPattern *pat, FcPattern *match)
 165 {
 166   /*  These values are not used for matching (except antialias), but for
 167       rendering, so make sure they are carried over to the match.
 168       We also put antialias here because most fonts are antialiased, so
 169       the match will have antialias true.  */
 170
 171   FcBool b = FcTrue;
 172   int i;
 173   double dpi;
 174
 175   FcPatternGetBool (pat, FC_ANTIALIAS, 0, &b);
 176   if (! b)
 177     {
 178       FcPatternDel (match, FC_ANTIALIAS);
 179       FcPatternAddBool (match, FC_ANTIALIAS, FcFalse);
 180     }
 181   FcPatternGetBool (pat, FC_HINTING, 0, &b);
 182   if (! b)
 183     {
 184       FcPatternDel (match, FC_HINTING);
 185       FcPatternAddBool (match, FC_HINTING, FcFalse);
 186     }
 187 #ifndef FC_HINT_STYLE
 188 # define FC_HINT_STYLE "hintstyle"
 189 #endif
 190   if (FcResultMatch == FcPatternGetInteger (pat, FC_HINT_STYLE, 0, &i))
 191     {
 192       FcPatternDel (match, FC_HINT_STYLE);
 193       FcPatternAddInteger (match, FC_HINT_STYLE, i);
 194     }
 195 #ifndef FC_LCD_FILTER
 196   /* Older fontconfig versions don't have FC_LCD_FILTER. */
 197 #define FC_LCD_FILTER "lcdfilter"
 198 #endif
 199   if (FcResultMatch == FcPatternGetInteger (pat, FC_LCD_FILTER, 0, &i))
 200     {
 201       FcPatternDel (match, FC_LCD_FILTER);
 202       FcPatternAddInteger (match, FC_LCD_FILTER, i);
 203     }
 204   if (FcResultMatch == FcPatternGetInteger (pat, FC_RGBA, 0, &i))
 205     {
 206       FcPatternDel (match, FC_RGBA);
 207       FcPatternAddInteger (match, FC_RGBA, i);
 208     }
 209   if (FcResultMatch == FcPatternGetDouble (pat, FC_DPI, 0, &dpi))
 210     {
 211       FcPatternDel (match, FC_DPI);
 212       FcPatternAddDouble (match, FC_DPI, dpi);
 213     }
 214 }
 215
 216 static void
 217 xftfont_add_rendering_parameters (FcPattern *pat, Lisp_Object entity)
 218 {
 219   Lisp_Object tail;
 220   int ival;
 221
 222   for (tail = AREF (entity, FONT_EXTRA_INDEX); CONSP (tail); tail = XCDR (tail))
 223     {
 224       Lisp_Object key = XCAR (XCAR (tail));
 225       Lisp_Object val = XCDR (XCAR (tail));
 226
 227       if (EQ (key, QCantialias))
 228           FcPatternAddBool (pat, FC_ANTIALIAS, NILP (val) ? FcFalse : FcTrue);
 229       else if (EQ (key, QChinting))
 230         FcPatternAddBool (pat, FC_HINTING, NILP (val) ? FcFalse : FcTrue);
 231       else if (EQ (key, QCautohint))
 232         FcPatternAddBool (pat, FC_AUTOHINT, NILP (val) ? FcFalse : FcTrue);
 233       else if (EQ (key, QChintstyle))
 234         {
 235           if (INTEGERP (val))
 236             FcPatternAddInteger (pat, FC_HINT_STYLE, XINT (val));
 237           else if (SYMBOLP (val)
 238                    && FcNameConstant (SDATA (SYMBOL_NAME (val)), &ival))
 239             FcPatternAddInteger (pat, FC_HINT_STYLE, ival);
 240         }
 241       else if (EQ (key, QCrgba))
 242         {
 243           if (INTEGERP (val))
 244             FcPatternAddInteger (pat, FC_RGBA, XINT (val));
 245           else if (SYMBOLP (val)
 246                    && FcNameConstant (SDATA (SYMBOL_NAME (val)), &ival))
 247             FcPatternAddInteger (pat, FC_RGBA, ival);
 248         }
 249       else if (EQ (key, QClcdfilter))
 250         {
 251           if (INTEGERP (val))
 252             FcPatternAddInteger (pat, FC_LCD_FILTER, ival = XINT (val));
 253           else if (SYMBOLP (val)
 254                    && FcNameConstant (SDATA (SYMBOL_NAME (val)), &ival))
 255             FcPatternAddInteger (pat, FC_LCD_FILTER, ival);
 256         }
 257 #ifdef FC_EMBOLDEN
 258       else if (EQ (key, QCembolden))
 259         FcPatternAddBool (pat, FC_EMBOLDEN, NILP (val) ? FcFalse : FcTrue);
 260 #endif
 261     }
 262 }
 263
 264 static Lisp_Object
 265 xftfont_open (FRAME_PTR f, Lisp_Object entity, int pixel_size)
 266 {
 267   FcResult result;
 268   Display *display = FRAME_X_DISPLAY (f);
 269   Lisp_Object val, filename, idx, font_object;
 270   FcPattern *pat = NULL, *match;
 271   struct xftfont_info *xftfont_info = NULL;
 272   struct font *font;
 273   double size = 0;
 274   XftFont *xftfont = NULL;
 275   int spacing;
 276   char name[256];
 277   int len, i;
 278   XGlyphInfo extents;
 279   FT_Face ft_face;
 280   FcMatrix *matrix;
 281
 282   val = assq_no_quit (QCfont_entity, AREF (entity, FONT_EXTRA_INDEX));
 283   if (! CONSP (val))
 284     return Qnil;
 285   val = XCDR (val);
 286   filename = XCAR (val);
 287   idx = XCDR (val);
 288   size = XINT (AREF (entity, FONT_SIZE_INDEX));
 289   if (size == 0)
 290     size = pixel_size;
 291   pat = FcPatternCreate ();
 292   FcPatternAddInteger (pat, FC_WEIGHT, FONT_WEIGHT_NUMERIC (entity));
 293   i = FONT_SLANT_NUMERIC (entity) - 100;
 294   if (i < 0) i = 0;
 295   FcPatternAddInteger (pat, FC_SLANT, i);
 296   FcPatternAddInteger (pat, FC_WIDTH, FONT_WIDTH_NUMERIC (entity));
 297   FcPatternAddDouble (pat, FC_PIXEL_SIZE, pixel_size);
 298   val = AREF (entity, FONT_FAMILY_INDEX);
 299   if (! NILP (val))
 300     FcPatternAddString (pat, FC_FAMILY, (FcChar8 *) SDATA (SYMBOL_NAME (val)));
 301   val = AREF (entity, FONT_FOUNDRY_INDEX);
 302   if (! NILP (val))
 303     FcPatternAddString (pat, FC_FOUNDRY, (FcChar8 *) SDATA (SYMBOL_NAME (val)));
 304   val = AREF (entity, FONT_SPACING_INDEX);
 305   if (! NILP (val))
 306     FcPatternAddInteger (pat, FC_SPACING, XINT (val));
 307   val = AREF (entity, FONT_DPI_INDEX);
 308   if (! NILP (val))
 309     {
 310       double dbl = XINT (val);
 311
 312       FcPatternAddDouble (pat, FC_DPI, dbl);
 313     }
 314   val = AREF (entity, FONT_AVGWIDTH_INDEX);
 315   if (INTEGERP (val) && XINT (val) == 0)
 316     FcPatternAddBool (pat, FC_SCALABLE, FcTrue);
 317   /* This is necessary to identify the exact font (e.g. 10x20.pcf.gz
 318      over 10x20-ISO8859-1.pcf.gz).  */
 319   FcPatternAddCharSet (pat, FC_CHARSET, ftfont_get_fc_charset (entity));
 320
 321   xftfont_add_rendering_parameters (pat, entity);
 322
 323   FcPatternAddString (pat, FC_FILE, (FcChar8 *) SDATA (filename));
 324   FcPatternAddInteger (pat, FC_INDEX, XINT (idx));
 325
 326
 327   block_input ();
 328   /* Make sure that the Xrender extension is added before the Xft one.
 329      Otherwise, the close-display hook set by Xft is called after the
 330      one for Xrender, and the former tries to re-add the latter.  This
 331      results in inconsistency of internal states and leads to X
 332      protocol error when one reconnects to the same X server.
 333      (Bug#1696)  */
 334   {
 335     int event_base, error_base;
 336     XRenderQueryExtension (display, &event_base, &error_base);
 337   }
 338
 339   /* Substitute in values from X resources and XftDefaultSet.  */
 340   XftDefaultSubstitute (display, FRAME_X_SCREEN_NUMBER (f), pat);
 341   match = XftFontMatch (display, FRAME_X_SCREEN_NUMBER (f), pat, &result);
 342   xftfont_fix_match (pat, match);
 343
 344   FcPatternDestroy (pat);
 345   xftfont = XftFontOpenPattern (display, match);
 346   if (!xftfont)
 347     {
 348       unblock_input ();
 349       XftPatternDestroy (match);
 350       return Qnil;
 351     }
 352   ft_face = XftLockFace (xftfont);
 353   unblock_input ();
 354
 355   /* We should not destroy PAT here because it is kept in XFTFONT and
 356      destroyed automatically when XFTFONT is closed.  */
 357   font_object = font_make_object (VECSIZE (struct xftfont_info), entity, size);
 358   ASET (font_object, FONT_TYPE_INDEX, Qxft);
 359   len = font_unparse_xlfd (entity, size, name, 256);
 360   if (len > 0)
 361     ASET (font_object, FONT_NAME_INDEX, make_string (name, len));
 362   len = font_unparse_fcname (entity, size, name, 256);
 363   if (len > 0)
 364     ASET (font_object, FONT_FULLNAME_INDEX, make_string (name, len));
 365   else
 366     ASET (font_object, FONT_FULLNAME_INDEX,
 367           AREF (font_object, FONT_NAME_INDEX));
 368   ASET (font_object, FONT_FILE_INDEX, filename);
 369   ASET (font_object, FONT_FORMAT_INDEX,
 370         ftfont_font_format (xftfont->pattern, filename));
 371   font = XFONT_OBJECT (font_object);
 372   font->pixel_size = size;
 373   font->driver = &xftfont_driver;
 374   font->encoding_charset = font->repertory_charset = -1;
 375
 376   xftfont_info = (struct xftfont_info *) font;
 377   xftfont_info->display = display;
 378   xftfont_info->screen = FRAME_X_SCREEN_NUMBER (f);
 379   xftfont_info->xftfont = xftfont;
 380   /* This means that there's no need of transformation.  */
 381   xftfont_info->matrix.xx = 0;
 382   if (FcPatternGetMatrix (xftfont->pattern, FC_MATRIX, 0, &matrix)
 383       == FcResultMatch)
 384     {
 385       xftfont_info->matrix.xx = 0x10000L * matrix->xx;
 386       xftfont_info->matrix.yy = 0x10000L * matrix->yy;
 387       xftfont_info->matrix.xy = 0x10000L * matrix->xy;
 388       xftfont_info->matrix.yx = 0x10000L * matrix->yx;
 389     }
 390   if (INTEGERP (AREF (entity, FONT_SPACING_INDEX)))
 391     spacing = XINT (AREF (entity, FONT_SPACING_INDEX));
 392   else
 393     spacing = FC_PROPORTIONAL;
 394   if (! ascii_printable[0])
 395     {
 396       int ch;
 397       for (ch = 0; ch < 95; ch++)
 398         ascii_printable[ch] = ' ' + ch;
 399     }
 400   block_input ();
 401
 402   /* Unfortunately Xft doesn't provide a way to get minimum char
 403      width.  So, we set min_width to space_width.  */
 404
 405   if (spacing != FC_PROPORTIONAL
 406 #ifdef FC_DUAL
 407       && spacing != FC_DUAL
 408 #endif  /* FC_DUAL */
 409       )
 410     {
 411       font->min_width = font->max_width = font->average_width
 412         = font->space_width = xftfont->max_advance_width;
 413       XftTextExtents8 (display, xftfont, ascii_printable + 1, 94, &extents);
 414     }
 415   else
 416     {
 417       XftTextExtents8 (display, xftfont, ascii_printable, 1, &extents);
 418       font->min_width = font->max_width = font->space_width
 419         = extents.xOff;
 420       if (font->space_width <= 0)
 421         /* dirty workaround */
 422         font->space_width = pixel_size;
 423       XftTextExtents8 (display, xftfont, ascii_printable + 1, 94, &extents);
 424       font->average_width = (font->space_width + extents.xOff) / 95;
 425     }
 426   unblock_input ();
 427
 428   font->ascent = xftfont->ascent;
 429   font->descent = xftfont->descent;
 430   if (pixel_size >= 5)
 431     {
 432       /* The above condition is a dirty workaround because
 433          XftTextExtents8 behaves strangely for some fonts
 434          (e.g. "Dejavu Sans Mono") when pixel_size is less than 5. */
 435       if (font->ascent < extents.y)
 436         font->ascent = extents.y;
 437       if (font->descent < extents.height - extents.y)
 438         font->descent = extents.height - extents.y;
 439     }
 440   font->height = font->ascent + font->descent;
 441
 442   if (XINT (AREF (entity, FONT_SIZE_INDEX)) == 0)
 443     {
 444       int upEM = ft_face->units_per_EM;
 445
 446       font->underline_position = -ft_face->underline_position * size / upEM;
 447       font->underline_thickness = ft_face->underline_thickness * size / upEM;
 448       if (font->underline_thickness > 2)
 449         font->underline_position -= font->underline_thickness / 2;
 450     }
 451   else
 452     {
 453       font->underline_position = -1;
 454       font->underline_thickness = 0;
 455     }
 456 #ifdef HAVE_LIBOTF
 457   xftfont_info->maybe_otf = (ft_face->face_flags & FT_FACE_FLAG_SFNT) != 0;
 458   xftfont_info->otf = NULL;
 459 #endif  /* HAVE_LIBOTF */
 460   xftfont_info->ft_size = ft_face->size;
 461
 462   font->baseline_offset = 0;
 463   font->relative_compose = 0;
 464   font->default_ascent = 0;
 465   font->vertical_centering = 0;
 466 #ifdef FT_BDF_H
 467   if (! (ft_face->face_flags & FT_FACE_FLAG_SFNT))
 468     {
 469       BDF_PropertyRec rec;
 470
 471       if (FT_Get_BDF_Property (ft_face, "_MULE_BASELINE_OFFSET", &rec) == 0
 472           && rec.type == BDF_PROPERTY_TYPE_INTEGER)
 473         font->baseline_offset = rec.u.integer;
 474       if (FT_Get_BDF_Property (ft_face, "_MULE_RELATIVE_COMPOSE", &rec) == 0
 475           && rec.type == BDF_PROPERTY_TYPE_INTEGER)
 476         font->relative_compose = rec.u.integer;
 477       if (FT_Get_BDF_Property (ft_face, "_MULE_DEFAULT_ASCENT", &rec) == 0
 478           && rec.type == BDF_PROPERTY_TYPE_INTEGER)
 479         font->default_ascent = rec.u.integer;
 480     }
 481 #endif
 482
 483   return font_object;
 484 }
 485
 486 static void
 487 xftfont_close (FRAME_PTR f, struct font *font)
 488 {
 489   struct xftfont_info *xftfont_info = (struct xftfont_info *) font;
 490
 491 #ifdef HAVE_LIBOTF
 492   if (xftfont_info->otf)
 493     OTF_close (xftfont_info->otf);
 494 #endif
 495   block_input ();
 496   XftUnlockFace (xftfont_info->xftfont);
 497   XftFontClose (xftfont_info->display, xftfont_info->xftfont);
 498   unblock_input ();
 499 }
 500
 501 static int
 502 xftfont_prepare_face (FRAME_PTR f, struct face *face)
 503 {
 504   struct xftface_info *xftface_info;
 505
 506 #if 0
 507   /* This doesn't work if face->ascii_face doesn't use an Xft font. */
 508   if (face != face->ascii_face)
 509     {
 510       face->extra = face->ascii_face->extra;
 511       return 0;
 512     }
 513 #endif
 514
 515   xftface_info = malloc (sizeof *xftface_info);
 516   if (! xftface_info)
 517     return -1;
 518   xftfont_get_colors (f, face, face->gc, NULL,
 519                       &xftface_info->xft_fg, &xftface_info->xft_bg);
 520   face->extra = xftface_info;
 521   return 0;
 522 }
 523
 524 static void
 525 xftfont_done_face (FRAME_PTR f, struct face *face)
 526 {
 527   struct xftface_info *xftface_info;
 528
 529 #if 0
 530   /* This doesn't work if face->ascii_face doesn't use an Xft font. */
 531   if (face != face->ascii_face
 532       || ! face->extra)
 533     return;
 534 #endif
 535
 536   xftface_info = (struct xftface_info *) face->extra;
 537   if (xftface_info)
 538     {
 539       free (xftface_info);
 540       face->extra = NULL;
 541     }
 542 }
 543
 544 static int
 545 xftfont_has_char (Lisp_Object font, int c)
 546 {
 547   struct xftfont_info *xftfont_info;
 548   struct charset *cs = NULL;
 549
 550   if (EQ (AREF (font, FONT_ADSTYLE_INDEX), Qja)
 551       && charset_jisx0208 >= 0)
 552     cs = CHARSET_FROM_ID (charset_jisx0208);
 553   else if (EQ (AREF (font, FONT_ADSTYLE_INDEX), Qko)
 554       && charset_ksc5601 >= 0)
 555     cs = CHARSET_FROM_ID (charset_ksc5601);
 556   if (cs)
 557     return (ENCODE_CHAR (cs, c) != CHARSET_INVALID_CODE (cs));
 558
 559   if (FONT_ENTITY_P (font))
 560     return ftfont_driver.has_char (font, c);
 561   xftfont_info = (struct xftfont_info *) XFONT_OBJECT (font);
 562   return (XftCharExists (xftfont_info->display, xftfont_info->xftfont,
 563                          (FcChar32) c) == FcTrue);
 564 }
 565
 566 static unsigned
 567 xftfont_encode_char (struct font *font, int c)
 568 {
 569   struct xftfont_info *xftfont_info = (struct xftfont_info *) font;
 570   unsigned code = XftCharIndex (xftfont_info->display, xftfont_info->xftfont,
 571                                 (FcChar32) c);
 572
 573   return (code ? code : FONT_INVALID_CODE);
 574 }
 575
 576 static int
 577 xftfont_text_extents (struct font *font, unsigned int *code, int nglyphs, struct font_metrics *metrics)
 578 {
 579   struct xftfont_info *xftfont_info = (struct xftfont_info *) font;
 580   XGlyphInfo extents;
 581
 582   block_input ();
 583   XftGlyphExtents (xftfont_info->display, xftfont_info->xftfont, code, nglyphs,
 584                    &extents);
 585   unblock_input ();
 586   if (metrics)
 587     {
 588       metrics->lbearing = - extents.x;
 589       metrics->rbearing = - extents.x + extents.width;
 590       metrics->width = extents.xOff;
 591       metrics->ascent = extents.y;
 592       metrics->descent = extents.height - extents.y;
 593     }
 594   return extents.xOff;
 595 }
 596
 597 static XftDraw *
 598 xftfont_get_xft_draw (FRAME_PTR f)
 599 {
 600   XftDraw *xft_draw = font_get_frame_data (f, &xftfont_driver);
 601
 602   if (! xft_draw)
 603     {
 604       block_input ();
 605       xft_draw= XftDrawCreate (FRAME_X_DISPLAY (f),
 606                                FRAME_X_WINDOW (f),
 607                                FRAME_X_VISUAL (f),
 608                                FRAME_X_COLORMAP (f));
 609       unblock_input ();
 610       eassert (xft_draw != NULL);
 611       font_put_frame_data (f, &xftfont_driver, xft_draw);
 612     }
 613   return xft_draw;
 614 }
 615
 616 static int
 617 xftfont_draw (struct glyph_string *s, int from, int to, int x, int y,
 618               bool with_background)
 619 {
 620   FRAME_PTR f = s->f;
 621   struct face *face = s->face;
 622   struct xftfont_info *xftfont_info = (struct xftfont_info *) s->font;
 623   struct xftface_info *xftface_info = NULL;
 624   XftDraw *xft_draw = xftfont_get_xft_draw (f);
 625   FT_UInt *code;
 626   XftColor fg, bg;
 627   int len = to - from;
 628   int i;
 629
 630   if (s->font == face->font)
 631     xftface_info = (struct xftface_info *) face->extra;
 632   xftfont_get_colors (f, face, s->gc, xftface_info,
 633                       &fg, with_background ? &bg : NULL);
 634   block_input ();
 635   if (s->num_clips > 0)
 636     XftDrawSetClipRectangles (xft_draw, 0, 0, s->clip, s->num_clips);
 637   else
 638     XftDrawSetClip (xft_draw, NULL);
 639
 640   if (with_background)
 641     XftDrawRect (xft_draw, &bg,
 642                  x, y - s->font->ascent, s->width, s->font->height);
 643   code = alloca (sizeof (FT_UInt) * len);
 644   for (i = 0; i < len; i++)
 645     code[i] = ((XCHAR2B_BYTE1 (s->char2b + from + i) << 8)
 646                | XCHAR2B_BYTE2 (s->char2b + from + i));
 647
 648   if (s->padding_p)
 649     for (i = 0; i < len; i++)
 650       XftDrawGlyphs (xft_draw, &fg, xftfont_info->xftfont,
 651                      x + i, y, code + i, 1);
 652   else
 653     XftDrawGlyphs (xft_draw, &fg, xftfont_info->xftfont,
 654                    x, y, code, len);
 655   unblock_input ();
 656
 657   return len;
 658 }
 659
 660 #if defined HAVE_M17N_FLT && defined HAVE_LIBOTF
 661 static Lisp_Object
 662 xftfont_shape (Lisp_Object lgstring)
 663 {
 664   struct font *font;
 665   struct xftfont_info *xftfont_info;
 666   FT_Face ft_face;
 667   Lisp_Object val;
 668
 669   CHECK_FONT_GET_OBJECT (LGSTRING_FONT (lgstring), font);
 670   xftfont_info = (struct xftfont_info *) font;
 671   ft_face = XftLockFace (xftfont_info->xftfont);
 672   xftfont_info->ft_size = ft_face->size;
 673   val = ftfont_driver.shape (lgstring);
 674   XftUnlockFace (xftfont_info->xftfont);
 675   return val;
 676 }
 677 #endif
 678
 679 static int
 680 xftfont_end_for_frame (FRAME_PTR f)
 681 {
 682   XftDraw *xft_draw;
 683
 684   /* Don't do anything if display is dead */
 685   if (FRAME_X_DISPLAY (f) == NULL) return 0;
 686
 687   xft_draw = font_get_frame_data (f, &xftfont_driver);
 688
 689   if (xft_draw)
 690     {
 691       block_input ();
 692       XftDrawDestroy (xft_draw);
 693       unblock_input ();
 694       font_put_frame_data (f, &xftfont_driver, NULL);
 695     }
 696   return 0;
 697 }
 698
 699 static bool
 700 xftfont_cached_font_ok (struct frame *f, Lisp_Object font_object,
 701                         Lisp_Object entity)
 702 {
 703   struct xftfont_info *info = (struct xftfont_info *) XFONT_OBJECT (font_object);
 704   FcPattern *oldpat = info->xftfont->pattern;
 705   Display *display = FRAME_X_DISPLAY (f);
 706   FcPattern *pat = FcPatternCreate ();
 707   FcBool b1, b2;
 708   bool ok = 0;
 709   int i1, i2, r1, r2;
 710
 711   xftfont_add_rendering_parameters (pat, entity);
 712   XftDefaultSubstitute (display, FRAME_X_SCREEN_NUMBER (f), pat);
 713
 714   r1 = FcPatternGetBool (pat, FC_ANTIALIAS, 0, &b1);
 715   r2 = FcPatternGetBool (oldpat, FC_ANTIALIAS, 0, &b2);
 716   if (r1 != r2 || b1 != b2) goto out;
 717   r1 = FcPatternGetBool (pat, FC_HINTING, 0, &b1);
 718   r2 = FcPatternGetBool (oldpat, FC_HINTING, 0, &b2);
 719   if (r1 != r2 || b1 != b2) goto out;
 720   r1 = FcPatternGetBool (pat, FC_AUTOHINT, 0, &b1);
 721   r2 = FcPatternGetBool (oldpat, FC_AUTOHINT, 0, &b2);
 722   if (r1 != r2 || b1 != b2) goto out;
 723 #ifdef FC_EMBOLDEN
 724   r1 = FcPatternGetBool (pat, FC_EMBOLDEN, 0, &b1);
 725   r2 = FcPatternGetBool (oldpat, FC_EMBOLDEN, 0, &b2);
 726   if (r1 != r2 || b1 != b2) goto out;
 727 #endif
 728   r1 = FcPatternGetInteger (pat, FC_HINT_STYLE, 0, &i1);
 729   r2 = FcPatternGetInteger (oldpat, FC_HINT_STYLE, 0, &i2);
 730   if (r1 != r2 || i1 != i2) goto out;
 731   r1 = FcPatternGetInteger (pat, FC_LCD_FILTER, 0, &i1);
 732   r2 = FcPatternGetInteger (oldpat, FC_LCD_FILTER, 0, &i2);
 733   if (r1 != r2 || i1 != i2) goto out;
 734   r1 = FcPatternGetInteger (pat, FC_RGBA, 0, &i1);
 735   r2 = FcPatternGetInteger (oldpat, FC_RGBA, 0, &i2);
 736   if (r1 != r2 || i1 != i2) goto out;
 737
 738   ok = 1;
 739  out:
 740   FcPatternDestroy (pat);
 741   return ok;
 742 }
 743
 744 void
 745 syms_of_xftfont (void)
 746 {
 747   DEFSYM (Qxft, "xft");
 748   DEFSYM (QChinting, ":hinting");
 749   DEFSYM (QCautohint, ":autohint");
 750   DEFSYM (QChintstyle, ":hintstyle");
 751   DEFSYM (QCrgba, ":rgba");
 752   DEFSYM (QCembolden, ":embolden");
 753   DEFSYM (QClcdfilter, ":lcdfilter");
 754
 755   ascii_printable[0] = 0;
 756
 757   xftfont_driver = ftfont_driver;
 758   xftfont_driver.type = Qxft;
 759   xftfont_driver.get_cache = xfont_driver.get_cache;
 760   xftfont_driver.list = xftfont_list;
 761   xftfont_driver.match = xftfont_match;
 762   xftfont_driver.open = xftfont_open;
 763   xftfont_driver.close = xftfont_close;
 764   xftfont_driver.prepare_face = xftfont_prepare_face;
 765   xftfont_driver.done_face = xftfont_done_face;
 766   xftfont_driver.has_char = xftfont_has_char;
 767   xftfont_driver.encode_char = xftfont_encode_char;
 768   xftfont_driver.text_extents = xftfont_text_extents;
 769   xftfont_driver.draw = xftfont_draw;
 770   xftfont_driver.end_for_frame = xftfont_end_for_frame;
 771   xftfont_driver.cached_font_ok = xftfont_cached_font_ok;
 772 #if defined (HAVE_M17N_FLT) && defined (HAVE_LIBOTF)
 773   xftfont_driver.shape = xftfont_shape;
 774 #endif
 775
 776   register_font_driver (&xftfont_driver, NULL);
 777 }