src/xftfont.c

   1 /* xftfont.c -- XFT font driver.
   2    Copyright (C) 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
   3    Copyright (C) 2006, 2007, 2008, 2009, 2010
   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 <setjmp.h>
  25 #include <X11/Xlib.h>
  26 #include <X11/Xft/Xft.h>
  27
  28 #include "lisp.h"
  29 #include "dispextern.h"
  30 #include "xterm.h"
  31 #include "frame.h"
  32 #include "blockinput.h"
  33 #include "character.h"
  34 #include "charset.h"
  35 #include "composite.h"
  36 #include "fontset.h"
  37 #include "font.h"
  38 #include "ftfont.h"
  39
  40 /* Xft font driver.  */
  41
  42 static Lisp_Object Qxft;
  43 static Lisp_Object QChinting, QCautohint, QChintstyle, QCrgba, QCembolden,
  44   QClcdfilter;
  45
  46 /* The actual structure for Xft font that can be casted to struct
  47    font.  */
  48
  49 struct xftfont_info
  50 {
  51   struct font font;
  52   /* The following five members must be here in this order to be
  53      compatible with struct ftfont_info (in ftfont.c).  */
  54 #ifdef HAVE_LIBOTF
  55   int maybe_otf;          /* Flag to tell if this may be OTF or not.  */
  56   OTF *otf;
  57 #endif  /* HAVE_LIBOTF */
  58   FT_Size ft_size;
  59   int index;
  60   FT_Matrix matrix;
  61   Display *display;
  62   int screen;
  63   XftFont *xftfont;
  64 };
  65
  66 /* Structure pointed by (struct face *)->extra  */
  67
  68 struct xftface_info
  69 {
  70   XftColor xft_fg;              /* color for face->foreground */
  71   XftColor xft_bg;              /* color for face->background */
  72 };
  73
  74 static void xftfont_get_colors (FRAME_PTR, struct face *, GC gc,
  75                                 struct xftface_info *,
  76                                 XftColor *fg, XftColor *bg);
  77
  78
  79 /* Setup foreground and background colors of GC into FG and BG.  If
  80    XFTFACE_INFO is not NULL, reuse the colors in it if possible.  BG
  81    may be NULL.  */
  82
  83 static void
  84 xftfont_get_colors (FRAME_PTR f, struct face *face, GC gc, struct xftface_info *xftface_info, XftColor *fg, XftColor *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 (Lisp_Object, Lisp_Object);
 141 static Lisp_Object xftfont_match (Lisp_Object, Lisp_Object);
 142 static Lisp_Object xftfont_open (FRAME_PTR, Lisp_Object, int);
 143 static void xftfont_close (FRAME_PTR, struct font *);
 144 static int xftfont_prepare_face (FRAME_PTR, struct face *);
 145 static void xftfont_done_face (FRAME_PTR, struct face *);
 146 static int xftfont_has_char (Lisp_Object, int);
 147 static unsigned xftfont_encode_char (struct font *, int);
 148 static int xftfont_text_extents (struct font *, unsigned *, int,
 149                                  struct font_metrics *);
 150 static int xftfont_draw (struct glyph_string *, int, int, int, int, int);
 151 static int xftfont_end_for_frame (FRAME_PTR f);
 152
 153 struct font_driver xftfont_driver;
 154
 155 static Lisp_Object
 156 xftfont_list (Lisp_Object frame, Lisp_Object spec)
 157 {
 158   Lisp_Object list = ftfont_driver.list (frame, spec), tail;
 159
 160   for (tail = list; CONSP (tail); tail = XCDR (tail))
 161     ASET (XCAR (tail), FONT_TYPE_INDEX, Qxft);
 162   return list;
 163 }
 164
 165 static Lisp_Object
 166 xftfont_match (Lisp_Object frame, Lisp_Object spec)
 167 {
 168   Lisp_Object entity = ftfont_driver.match (frame, spec);
 169
 170   if (! NILP (entity))
 171     ASET (entity, FONT_TYPE_INDEX, Qxft);
 172   return entity;
 173 }
 174
 175 static FcChar8 ascii_printable[95];
 176
 177 static void
 178 xftfont_fix_match (FcPattern *pat, FcPattern *match)
 179 {
 180   /*  These values are not used for matching (except antialias), but for
 181       rendering, so make sure they are carried over to the match.
 182       We also put antialias here because most fonts are antialiased, so
 183       the match will have antialias true.  */
 184
 185   FcBool b = FcTrue;
 186   int i;
 187   double dpi;
 188
 189   FcPatternGetBool (pat, FC_ANTIALIAS, 0, &b);
 190   if (! b)
 191     {
 192       FcPatternDel (match, FC_ANTIALIAS);
 193       FcPatternAddBool (match, FC_ANTIALIAS, FcFalse);
 194     }
 195   FcPatternGetBool (pat, FC_HINTING, 0, &b);
 196   if (! b)
 197     {
 198       FcPatternDel (match, FC_HINTING);
 199       FcPatternAddBool (match, FC_HINTING, FcFalse);
 200     }
 201   if (FcResultMatch == FcPatternGetInteger (pat, FC_HINT_STYLE, 0, &i))
 202     {
 203       FcPatternDel (match, FC_HINT_STYLE);
 204       FcPatternAddInteger (match, FC_HINT_STYLE, i);
 205     }
 206 #ifndef FC_LCD_FILTER
 207   /* Older fontconfig versions don't have FC_LCD_FILTER. */
 208 #define FC_LCD_FILTER "lcdfilter"
 209 #endif
 210   if (FcResultMatch == FcPatternGetInteger (pat, FC_LCD_FILTER, 0, &i))
 211     {
 212       FcPatternDel (match, FC_LCD_FILTER);
 213       FcPatternAddInteger (match, FC_LCD_FILTER, i);
 214     }
 215   if (FcResultMatch == FcPatternGetInteger (pat, FC_RGBA, 0, &i))
 216     {
 217       FcPatternDel (match, FC_RGBA);
 218       FcPatternAddInteger (match, FC_RGBA, i);
 219     }
 220   if (FcResultMatch == FcPatternGetDouble (pat, FC_DPI, 0, &dpi))
 221     {
 222       FcPatternDel (match, FC_DPI);
 223       FcPatternAddDouble (match, FC_DPI, dpi);
 224     }
 225 }
 226
 227 static void
 228 xftfont_add_rendering_parameters (FcPattern *pat, Lisp_Object entity)
 229 {
 230   Lisp_Object tail;
 231   int ival;
 232
 233   for (tail = AREF (entity, FONT_EXTRA_INDEX); CONSP (tail); tail = XCDR (tail))
 234     {
 235       Lisp_Object key = XCAR (XCAR (tail));
 236       Lisp_Object val = XCDR (XCAR (tail));
 237
 238       if (EQ (key, QCantialias))
 239           FcPatternAddBool (pat, FC_ANTIALIAS, NILP (val) ? FcFalse : FcTrue);
 240       else if (EQ (key, QChinting))
 241         FcPatternAddBool (pat, FC_HINTING, NILP (val) ? FcFalse : FcTrue);
 242       else if (EQ (key, QCautohint))
 243         FcPatternAddBool (pat, FC_AUTOHINT, NILP (val) ? FcFalse : FcTrue);
 244       else if (EQ (key, QChintstyle))
 245         {
 246           if (INTEGERP (val))
 247             FcPatternAddInteger (pat, FC_HINT_STYLE, XINT (val));
 248           else if (SYMBOLP (val)
 249                    && FcNameConstant (SDATA (SYMBOL_NAME (val)), &ival))
 250             FcPatternAddInteger (pat, FC_HINT_STYLE, ival);
 251         }
 252       else if (EQ (key, QCrgba))
 253         {
 254           if (INTEGERP (val))
 255             FcPatternAddInteger (pat, FC_RGBA, XINT (val));
 256           else if (SYMBOLP (val)
 257                    && FcNameConstant (SDATA (SYMBOL_NAME (val)), &ival))
 258             FcPatternAddInteger (pat, FC_RGBA, ival);
 259         }
 260       else if (EQ (key, QClcdfilter))
 261         {
 262           if (INTEGERP (val))
 263             FcPatternAddInteger (pat, FC_LCD_FILTER, ival = XINT (val));
 264           else if (SYMBOLP (val)
 265                    && FcNameConstant (SDATA (SYMBOL_NAME (val)), &ival))
 266             FcPatternAddInteger (pat, FC_LCD_FILTER, ival);
 267         }
 268 #ifdef FC_EMBOLDEN
 269       else if (EQ (key, QCembolden))
 270         FcPatternAddBool (pat, FC_EMBOLDEN, NILP (val) ? FcFalse : FcTrue);
 271 #endif
 272     }
 273 }
 274
 275 static Lisp_Object
 276 xftfont_open (FRAME_PTR f, Lisp_Object entity, int pixel_size)
 277 {
 278   FcResult result;
 279   Display *display = FRAME_X_DISPLAY (f);
 280   Lisp_Object val, filename, index, font_object;
 281   FcPattern *pat = NULL, *match;
 282   struct xftfont_info *xftfont_info = NULL;
 283   struct font *font;
 284   double size = 0;
 285   XftFont *xftfont = NULL;
 286   int spacing;
 287   char name[256];
 288   int len, i;
 289   XGlyphInfo extents;
 290   FT_Face ft_face;
 291   FcMatrix *matrix;
 292
 293   val = assq_no_quit (QCfont_entity, AREF (entity, FONT_EXTRA_INDEX));
 294   if (! CONSP (val))
 295     return Qnil;
 296   val = XCDR (val);
 297   filename = XCAR (val);
 298   index = XCDR (val);
 299   size = XINT (AREF (entity, FONT_SIZE_INDEX));
 300   if (size == 0)
 301     size = pixel_size;
 302   pat = FcPatternCreate ();
 303   FcPatternAddInteger (pat, FC_WEIGHT, FONT_WEIGHT_NUMERIC (entity));
 304   i = FONT_SLANT_NUMERIC (entity) - 100;
 305   if (i < 0) i = 0;
 306   FcPatternAddInteger (pat, FC_SLANT, i);
 307   FcPatternAddInteger (pat, FC_WIDTH, FONT_WIDTH_NUMERIC (entity));
 308   FcPatternAddDouble (pat, FC_PIXEL_SIZE, pixel_size);
 309   val = AREF (entity, FONT_FAMILY_INDEX);
 310   if (! NILP (val))
 311     FcPatternAddString (pat, FC_FAMILY, (FcChar8 *) SDATA (SYMBOL_NAME (val)));
 312   val = AREF (entity, FONT_FOUNDRY_INDEX);
 313   if (! NILP (val))
 314     FcPatternAddString (pat, FC_FOUNDRY, (FcChar8 *) SDATA (SYMBOL_NAME (val)));
 315   val = AREF (entity, FONT_SPACING_INDEX);
 316   if (! NILP (val))
 317     FcPatternAddInteger (pat, FC_SPACING, XINT (val));
 318   val = AREF (entity, FONT_DPI_INDEX);
 319   if (! NILP (val))
 320     {
 321       double dbl = XINT (val);
 322
 323       FcPatternAddDouble (pat, FC_DPI, dbl);
 324     }
 325   val = AREF (entity, FONT_AVGWIDTH_INDEX);
 326   if (INTEGERP (val) && XINT (val) == 0)
 327     FcPatternAddBool (pat, FC_SCALABLE, FcTrue);
 328   /* This is necessary to identify the exact font (e.g. 10x20.pcf.gz
 329      over 10x20-ISO8859-1.pcf.gz).  */
 330   FcPatternAddCharSet (pat, FC_CHARSET, ftfont_get_fc_charset (entity));
 331
 332   xftfont_add_rendering_parameters (pat, entity);
 333
 334   FcPatternAddString (pat, FC_FILE, (FcChar8 *) SDATA (filename));
 335   FcPatternAddInteger (pat, FC_INDEX, XINT (index));
 336
 337
 338   BLOCK_INPUT;
 339   /* Make sure that the Xrender extension is added before the Xft one.
 340      Otherwise, the close-display hook set by Xft is called after the
 341      one for Xrender, and the former tries to re-add the latter.  This
 342      results in inconsistency of internal states and leads to X
 343      protocol error when one reconnects to the same X server.
 344      (Bug#1696)  */
 345   {
 346     int event_base, error_base;
 347     XRenderQueryExtension (display, &event_base, &error_base);
 348   }
 349
 350   /* Substitute in values from X resources and XftDefaultSet.  */
 351   XftDefaultSubstitute (display, FRAME_X_SCREEN_NUMBER (f), pat);
 352   match = XftFontMatch (display, FRAME_X_SCREEN_NUMBER (f), pat, &result);
 353   xftfont_fix_match (pat, match);
 354
 355   FcPatternDestroy (pat);
 356   xftfont = XftFontOpenPattern (display, match);
 357   if (!xftfont)
 358     {
 359       UNBLOCK_INPUT;
 360       XftPatternDestroy (match);
 361       return Qnil;
 362     }
 363   ft_face = XftLockFace (xftfont);
 364   UNBLOCK_INPUT;
 365
 366   /* We should not destroy PAT here because it is kept in XFTFONT and
 367      destroyed automatically when XFTFONT is closed.  */
 368   font_object = font_make_object (VECSIZE (struct xftfont_info), entity, size);
 369   ASET (font_object, FONT_TYPE_INDEX, Qxft);
 370   len = font_unparse_xlfd (entity, size, name, 256);
 371   if (len > 0)
 372     ASET (font_object, FONT_NAME_INDEX, make_string (name, len));
 373   len = font_unparse_fcname (entity, size, name, 256);
 374   if (len > 0)
 375     ASET (font_object, FONT_FULLNAME_INDEX, make_string (name, len));
 376   else
 377     ASET (font_object, FONT_FULLNAME_INDEX,
 378           AREF (font_object, FONT_NAME_INDEX));
 379   ASET (font_object, FONT_FILE_INDEX, filename);
 380   ASET (font_object, FONT_FORMAT_INDEX,
 381         ftfont_font_format (xftfont->pattern, filename));
 382   font = XFONT_OBJECT (font_object);
 383   font->pixel_size = pixel_size;
 384   font->driver = &xftfont_driver;
 385   font->encoding_charset = font->repertory_charset = -1;
 386
 387   xftfont_info = (struct xftfont_info *) font;
 388   xftfont_info->display = display;
 389   xftfont_info->screen = FRAME_X_SCREEN_NUMBER (f);
 390   xftfont_info->xftfont = xftfont;
 391   /* This means that there's no need of transformation.  */
 392   xftfont_info->matrix.xx = 0;
 393   if (FcPatternGetMatrix (xftfont->pattern, FC_MATRIX, 0, &matrix)
 394       == FcResultMatch)
 395     {
 396       xftfont_info->matrix.xx = 0x10000L * matrix->xx;
 397       xftfont_info->matrix.yy = 0x10000L * matrix->yy;
 398       xftfont_info->matrix.xy = 0x10000L * matrix->xy;
 399       xftfont_info->matrix.yx = 0x10000L * matrix->yx;
 400     }
 401   font->pixel_size = size;
 402   font->driver = &xftfont_driver;
 403   if (INTEGERP (AREF (entity, FONT_SPACING_INDEX)))
 404     spacing = XINT (AREF (entity, FONT_SPACING_INDEX));
 405   else
 406     spacing = FC_PROPORTIONAL;
 407   if (! ascii_printable[0])
 408     {
 409       int i;
 410       for (i = 0; i < 95; i++)
 411         ascii_printable[i] = ' ' + i;
 412     }
 413   BLOCK_INPUT;
 414   if (spacing != FC_PROPORTIONAL && spacing != FC_DUAL)
 415     {
 416       font->min_width = font->average_width = font->space_width
 417         = xftfont->max_advance_width;
 418       XftTextExtents8 (display, xftfont, ascii_printable + 1, 94, &extents);
 419     }
 420   else
 421     {
 422       XftTextExtents8 (display, xftfont, ascii_printable, 1, &extents);
 423       font->space_width = extents.xOff;
 424       if (font->space_width <= 0)
 425         /* dirty workaround */
 426         font->space_width = pixel_size;
 427       XftTextExtents8 (display, xftfont, ascii_printable + 1, 94, &extents);
 428       font->average_width = (font->space_width + extents.xOff) / 95;
 429     }
 430   UNBLOCK_INPUT;
 431
 432   font->ascent = xftfont->ascent;
 433   font->descent = xftfont->descent;
 434   if (pixel_size >= 5)
 435     {
 436       /* The above condition is a dirty workaround because
 437          XftTextExtents8 behaves strangely for some fonts
 438          (e.g. "Dejavu Sans Mono") when pixel_size is less than 5. */
 439       if (font->ascent < extents.y)
 440         font->ascent = extents.y;
 441       if (font->descent < extents.height - extents.y)
 442         font->descent = extents.height - extents.y;
 443     }
 444   font->height = font->ascent + font->descent;
 445
 446   if (XINT (AREF (entity, FONT_SIZE_INDEX)) == 0)
 447     {
 448       int upEM = ft_face->units_per_EM;
 449
 450       font->underline_position = -ft_face->underline_position * size / upEM;
 451       font->underline_thickness = ft_face->underline_thickness * size / upEM;
 452       if (font->underline_thickness > 2)
 453         font->underline_position -= font->underline_thickness / 2;
 454     }
 455   else
 456     {
 457       font->underline_position = -1;
 458       font->underline_thickness = 0;
 459     }
 460 #ifdef HAVE_LIBOTF
 461   xftfont_info->maybe_otf = ft_face->face_flags & FT_FACE_FLAG_SFNT;
 462   xftfont_info->otf = NULL;
 463 #endif  /* HAVE_LIBOTF */
 464   xftfont_info->ft_size = ft_face->size;
 465
 466   /* Unfortunately Xft doesn't provide a way to get minimum char
 467      width.  So, we use space_width instead.  */
 468   font->min_width = font->space_width;
 469
 470   font->baseline_offset = 0;
 471   font->relative_compose = 0;
 472   font->default_ascent = 0;
 473   font->vertical_centering = 0;
 474 #ifdef FT_BDF_H
 475   if (! (ft_face->face_flags & FT_FACE_FLAG_SFNT))
 476     {
 477       BDF_PropertyRec rec;
 478
 479       if (FT_Get_BDF_Property (ft_face, "_MULE_BASELINE_OFFSET", &rec) == 0
 480           && rec.type == BDF_PROPERTY_TYPE_INTEGER)
 481         font->baseline_offset = rec.u.integer;
 482       if (FT_Get_BDF_Property (ft_face, "_MULE_RELATIVE_COMPOSE", &rec) == 0
 483           && rec.type == BDF_PROPERTY_TYPE_INTEGER)
 484         font->relative_compose = rec.u.integer;
 485       if (FT_Get_BDF_Property (ft_face, "_MULE_DEFAULT_ASCENT", &rec) == 0
 486           && rec.type == BDF_PROPERTY_TYPE_INTEGER)
 487         font->default_ascent = rec.u.integer;
 488     }
 489 #endif
 490
 491   return font_object;
 492 }
 493
 494 static void
 495 xftfont_close (FRAME_PTR f, struct font *font)
 496 {
 497   struct xftfont_info *xftfont_info = (struct xftfont_info *) font;
 498
 499 #ifdef HAVE_LIBOTF
 500   if (xftfont_info->otf)
 501     OTF_close (xftfont_info->otf);
 502 #endif
 503   BLOCK_INPUT;
 504   XftUnlockFace (xftfont_info->xftfont);
 505   XftFontClose (xftfont_info->display, xftfont_info->xftfont);
 506   UNBLOCK_INPUT;
 507 }
 508
 509 static int
 510 xftfont_prepare_face (FRAME_PTR f, struct face *face)
 511 {
 512   struct xftface_info *xftface_info;
 513
 514 #if 0
 515   /* This doesn't work if face->ascii_face doesn't use an Xft font. */
 516   if (face != face->ascii_face)
 517     {
 518       face->extra = face->ascii_face->extra;
 519       return 0;
 520     }
 521 #endif
 522
 523   xftface_info = malloc (sizeof (struct xftface_info));
 524   if (! xftface_info)
 525     return -1;
 526   xftfont_get_colors (f, face, face->gc, NULL,
 527                       &xftface_info->xft_fg, &xftface_info->xft_bg);
 528   face->extra = xftface_info;
 529   return 0;
 530 }
 531
 532 static void
 533 xftfont_done_face (FRAME_PTR f, struct face *face)
 534 {
 535   struct xftface_info *xftface_info;
 536
 537 #if 0
 538   /* This doesn't work if face->ascii_face doesn't use an Xft font. */
 539   if (face != face->ascii_face
 540       || ! face->extra)
 541     return;
 542 #endif
 543
 544   xftface_info = (struct xftface_info *) face->extra;
 545   if (xftface_info)
 546     {
 547       free (xftface_info);
 548       face->extra = NULL;
 549     }
 550 }
 551
 552 static int
 553 xftfont_has_char (Lisp_Object font, int c)
 554 {
 555   struct xftfont_info *xftfont_info;
 556   struct charset *cs = NULL;
 557
 558   if (EQ (AREF (font, FONT_ADSTYLE_INDEX), Qja)
 559       && charset_jisx0208 >= 0)
 560     cs = CHARSET_FROM_ID (charset_jisx0208);
 561   else if (EQ (AREF (font, FONT_ADSTYLE_INDEX), Qko)
 562       && charset_ksc5601 >= 0)
 563     cs = CHARSET_FROM_ID (charset_ksc5601);
 564   if (cs)
 565     return (ENCODE_CHAR (cs, c) != CHARSET_INVALID_CODE (cs));
 566
 567   if (FONT_ENTITY_P (font))
 568     return ftfont_driver.has_char (font, c);
 569   xftfont_info = (struct xftfont_info *) XFONT_OBJECT (font);
 570   return (XftCharExists (xftfont_info->display, xftfont_info->xftfont,
 571                          (FcChar32) c) == FcTrue);
 572 }
 573
 574 static unsigned
 575 xftfont_encode_char (struct font *font, int c)
 576 {
 577   struct xftfont_info *xftfont_info = (struct xftfont_info *) font;
 578   unsigned code = XftCharIndex (xftfont_info->display, xftfont_info->xftfont,
 579                                 (FcChar32) c);
 580
 581   return (code ? code : FONT_INVALID_CODE);
 582 }
 583
 584 static int
 585 xftfont_text_extents (struct font *font, unsigned int *code, int nglyphs, struct font_metrics *metrics)
 586 {
 587   struct xftfont_info *xftfont_info = (struct xftfont_info *) font;
 588   XGlyphInfo extents;
 589
 590   BLOCK_INPUT;
 591   XftGlyphExtents (xftfont_info->display, xftfont_info->xftfont, code, nglyphs,
 592                    &extents);
 593   UNBLOCK_INPUT;
 594   if (metrics)
 595     {
 596       metrics->lbearing = - extents.x;
 597       metrics->rbearing = - extents.x + extents.width;
 598       metrics->width = extents.xOff;
 599       metrics->ascent = extents.y;
 600       metrics->descent = extents.height - extents.y;
 601     }
 602   return extents.xOff;
 603 }
 604
 605 static XftDraw *
 606 xftfont_get_xft_draw (FRAME_PTR f)
 607 {
 608   XftDraw *xft_draw = font_get_frame_data (f, &xftfont_driver);
 609
 610   if (! xft_draw)
 611     {
 612       BLOCK_INPUT;
 613       xft_draw= XftDrawCreate (FRAME_X_DISPLAY (f),
 614                                FRAME_X_WINDOW (f),
 615                                FRAME_X_VISUAL (f),
 616                                FRAME_X_COLORMAP (f));
 617       UNBLOCK_INPUT;
 618       if (! xft_draw)
 619         abort ();
 620       font_put_frame_data (f, &xftfont_driver, xft_draw);
 621     }
 622   return xft_draw;
 623 }
 624
 625 static int
 626 xftfont_draw (struct glyph_string *s, int from, int to, int x, int y, int with_background)
 627 {
 628   FRAME_PTR f = s->f;
 629   struct face *face = s->face;
 630   struct xftfont_info *xftfont_info = (struct xftfont_info *) s->font;
 631   struct xftface_info *xftface_info = NULL;
 632   XftDraw *xft_draw = xftfont_get_xft_draw (f);
 633   FT_UInt *code;
 634   XftColor fg, bg;
 635   int len = to - from;
 636   int i;
 637
 638   if (s->font == face->font)
 639     xftface_info = (struct xftface_info *) face->extra;
 640   xftfont_get_colors (f, face, s->gc, xftface_info,
 641                       &fg, with_background ? &bg : NULL);
 642   BLOCK_INPUT;
 643   if (s->num_clips > 0)
 644     XftDrawSetClipRectangles (xft_draw, 0, 0, s->clip, s->num_clips);
 645   else
 646     XftDrawSetClip (xft_draw, NULL);
 647
 648   if (with_background)
 649     XftDrawRect (xft_draw, &bg,
 650                  x, y - face->font->ascent, s->width, face->font->height);
 651   code = alloca (sizeof (FT_UInt) * len);
 652   for (i = 0; i < len; i++)
 653     code[i] = ((XCHAR2B_BYTE1 (s->char2b + from + i) << 8)
 654                | XCHAR2B_BYTE2 (s->char2b + from + i));
 655
 656   if (s->padding_p)
 657     for (i = 0; i < len; i++)
 658       XftDrawGlyphs (xft_draw, &fg, xftfont_info->xftfont,
 659                      x + i, y, code + i, 1);
 660   else
 661     XftDrawGlyphs (xft_draw, &fg, xftfont_info->xftfont,
 662                    x, y, code, len);
 663   UNBLOCK_INPUT;
 664
 665   return len;
 666 }
 667
 668 Lisp_Object
 669 xftfont_shape (Lisp_Object lgstring)
 670 {
 671   struct font *font;
 672   struct xftfont_info *xftfont_info;
 673   FT_Face ft_face;
 674   Lisp_Object val;
 675
 676   CHECK_FONT_GET_OBJECT (LGSTRING_FONT (lgstring), font);
 677   xftfont_info = (struct xftfont_info *) font;
 678   ft_face = XftLockFace (xftfont_info->xftfont);
 679   xftfont_info->ft_size = ft_face->size;
 680   val = ftfont_driver.shape (lgstring);
 681   XftUnlockFace (xftfont_info->xftfont);
 682   return val;
 683 }
 684
 685 static int
 686 xftfont_end_for_frame (FRAME_PTR f)
 687 {
 688   XftDraw *xft_draw;
 689
 690   /* Don't do anything if display is dead */
 691   if (FRAME_X_DISPLAY (f) == NULL) return 0;
 692
 693   xft_draw = font_get_frame_data (f, &xftfont_driver);
 694
 695   if (xft_draw)
 696     {
 697       BLOCK_INPUT;
 698       XftDrawDestroy (xft_draw);
 699       UNBLOCK_INPUT;
 700       font_put_frame_data (f, &xftfont_driver, NULL);
 701     }
 702   return 0;
 703 }
 704
 705 static int
 706 xftfont_cached_font_ok (struct frame *f, Lisp_Object font_object, 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   int ok = 0, i1, i2, r1, r2;
 714
 715   xftfont_add_rendering_parameters (pat, entity);
 716   XftDefaultSubstitute (display, FRAME_X_SCREEN_NUMBER (f), pat);
 717
 718   r1 = FcPatternGetBool (pat, FC_ANTIALIAS, 0, &b1);
 719   r2 = FcPatternGetBool (oldpat, FC_ANTIALIAS, 0, &b2);
 720   if (r1 != r2 || b1 != b2) goto out;
 721   r1 = FcPatternGetBool (pat, FC_HINTING, 0, &b1);
 722   r2 = FcPatternGetBool (oldpat, FC_HINTING, 0, &b2);
 723   if (r1 != r2 || b1 != b2) goto out;
 724   r1 = FcPatternGetBool (pat, FC_AUTOHINT, 0, &b1);
 725   r2 = FcPatternGetBool (oldpat, FC_AUTOHINT, 0, &b2);
 726   if (r1 != r2 || b1 != b2) goto out;
 727 #ifdef FC_EMBOLDEN
 728   r1 = FcPatternGetBool (pat, FC_EMBOLDEN, 0, &b1);
 729   r2 = FcPatternGetBool (oldpat, FC_EMBOLDEN, 0, &b2);
 730   if (r1 != r2 || b1 != b2) goto out;
 731 #endif
 732   r1 = FcPatternGetInteger (pat, FC_HINT_STYLE, 0, &i1);
 733   r2 = FcPatternGetInteger (oldpat, FC_HINT_STYLE, 0, &i2);
 734   if (r1 != r2 || i1 != i2) goto out;
 735   r1 = FcPatternGetInteger (pat, FC_LCD_FILTER, 0, &i1);
 736   r2 = FcPatternGetInteger (oldpat, FC_LCD_FILTER, 0, &i2);
 737   if (r1 != r2 || i1 != i2) goto out;
 738   r1 = FcPatternGetInteger (pat, FC_RGBA, 0, &i1);
 739   r2 = FcPatternGetInteger (oldpat, FC_RGBA, 0, &i2);
 740   if (r1 != r2 || i1 != i2) goto out;
 741
 742   ok = 1;
 743  out:
 744   FcPatternDestroy (pat);
 745   return ok;
 746 }
 747
 748 void
 749 syms_of_xftfont (void)
 750 {
 751   DEFSYM (Qxft, "xft");
 752   DEFSYM (QChinting, ":hinting");
 753   DEFSYM (QCautohint, ":autohint");
 754   DEFSYM (QChintstyle, ":hintstyle");
 755   DEFSYM (QCrgba, ":rgba");
 756   DEFSYM (QCembolden, ":embolden");
 757   DEFSYM (QClcdfilter, ":lcdfilter");
 758
 759   xftfont_driver = ftfont_driver;
 760   xftfont_driver.type = Qxft;
 761   xftfont_driver.get_cache = xfont_driver.get_cache;
 762   xftfont_driver.list = xftfont_list;
 763   xftfont_driver.match = xftfont_match;
 764   xftfont_driver.open = xftfont_open;
 765   xftfont_driver.close = xftfont_close;
 766   xftfont_driver.prepare_face = xftfont_prepare_face;
 767   xftfont_driver.done_face = xftfont_done_face;
 768   xftfont_driver.has_char = xftfont_has_char;
 769   xftfont_driver.encode_char = xftfont_encode_char;
 770   xftfont_driver.text_extents = xftfont_text_extents;
 771   xftfont_driver.draw = xftfont_draw;
 772   xftfont_driver.end_for_frame = xftfont_end_for_frame;
 773   xftfont_driver.cached_font_ok = xftfont_cached_font_ok;
 774 #if defined (HAVE_M17N_FLT) && defined (HAVE_LIBOTF)
 775   xftfont_driver.shape = xftfont_shape;
 776 #endif
 777
 778   register_font_driver (&xftfont_driver, NULL);
 779 }
 780
 781 /* arch-tag: 64ec61bf-7c8e-4fe6-b953-c6a85d5e1605
 782    (do not change this comment) */