src/w32font.h

   1 /* Shared GDI and Uniscribe Font backend declarations for the W32 API.
   2    Copyright (C) 2007-2011 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Emacs.
   5
   6 GNU Emacs is free software: you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation, either version 3 of the License, or
   9 (at your option) any later version.
  10
  11 GNU Emacs is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef EMACS_W32FONT_H
  20 #define EMACS_W32FONT_H
  21
  22
  23 /* Bit 17 of ntmFlags in NEWTEXTMETRIC is set for Postscript OpenType fonts,
  24    bit 18 for Truetype OpenType fonts, bit 20 for Type1 fonts.  */
  25 #ifndef NTM_PS_OPENTYPE
  26 #define NTM_PS_OPENTYPE 0x00020000
  27 #endif
  28 #ifndef NTM_TT_OPENTYPE
  29 #define NTM_TT_OPENTYPE 0x00040000
  30 #endif
  31 #ifndef NTM_TYPE1
  32 #define NTM_TYPE1 0x00100000
  33 #endif
  34
  35 #define NTMFLAGS_OPENTYPE (NTM_PS_OPENTYPE | NTM_TT_OPENTYPE)
  36
  37 struct w32_metric_cache
  38 {
  39   short lbearing, rbearing, width;
  40   unsigned char status;
  41 };
  42
  43 #define W32METRIC_NO_ATTEMPT 0
  44 #define W32METRIC_SUCCESS 1
  45 #define W32METRIC_FAIL 2
  46
  47 /* The actual structure for a w32 font, that can be cast to struct font.
  48    The Uniscribe backend extends this.  */
  49 struct w32font_info
  50 {
  51   struct font font;
  52   TEXTMETRICW metrics;
  53   unsigned int glyph_idx;
  54   struct w32_metric_cache **cached_metrics;
  55   int n_cache_blocks;
  56   HFONT hfont;
  57 };
  58
  59 /* Macros for getting OS specific information from a font struct.  */
  60 #define FONT_HANDLE(f) (((struct w32font_info *)(f))->hfont)
  61 #define FONT_TEXTMETRIC(f) (((struct w32font_info *)(f))->metrics)
  62
  63 #define CACHE_BLOCKSIZE 128
  64
  65 Lisp_Object w32font_get_cache (FRAME_PTR fe);
  66 Lisp_Object w32font_list_internal (Lisp_Object frame,
  67                                    Lisp_Object font_spec,
  68                                    int opentype_only);
  69 Lisp_Object w32font_match_internal (Lisp_Object frame,
  70                                     Lisp_Object font_spec,
  71                                     int opentype_only);
  72 int w32font_open_internal (FRAME_PTR f, Lisp_Object font_entity,
  73                            int pixel_size, Lisp_Object font_object);
  74 void w32font_close (FRAME_PTR f, struct font *font);
  75 int w32font_has_char (Lisp_Object entity, int c);
  76 int w32font_text_extents (struct font *font, unsigned *code, int nglyphs,
  77                           struct font_metrics *metrics);
  78 int w32font_draw (struct glyph_string *s, int from, int to,
  79                   int x, int y, int with_background);
  80
  81
  82 int uniscribe_check_otf (LOGFONT *font, Lisp_Object otf_spec);
  83
  84 Lisp_Object intern_font_name (char *);
  85
  86 #endif
  87