src/w32font.h

   1 /* Shared GDI and Uniscribe Font backend declarations for the Windows API.
   2    Copyright (C) 2007-2018 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 (at
   9 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 <https://www.gnu.org/licenses/>.  */
  18
  19 #ifndef EMACS_W32FONT_H
  20 #define EMACS_W32FONT_H
  21
  22 #include "font.h"
  23
  24 /* Bit 17 of ntmFlags in NEWTEXTMETRIC is set for PostScript OpenType fonts,
  25    bit 18 for TrueType OpenType fonts, bit 20 for Type1 fonts.  */
  26 #ifndef NTM_PS_OPENTYPE
  27 #define NTM_PS_OPENTYPE 0x00020000
  28 #endif
  29 #ifndef NTM_TT_OPENTYPE
  30 #define NTM_TT_OPENTYPE 0x00040000
  31 #endif
  32 #ifndef NTM_TYPE1
  33 #define NTM_TYPE1 0x00100000
  34 #endif
  35
  36 #define NTMFLAGS_OPENTYPE (NTM_PS_OPENTYPE | NTM_TT_OPENTYPE)
  37
  38 struct w32_metric_cache
  39 {
  40   short lbearing, rbearing, width, ascent, descent;
  41   unsigned char status;
  42 };
  43
  44 #define W32METRIC_NO_ATTEMPT 0
  45 #define W32METRIC_SUCCESS 1
  46 #define W32METRIC_FAIL 2
  47
  48 /* The actual structure for a w32 font, that can be cast to struct font.
  49    The Uniscribe backend extends this.  */
  50 struct w32font_info
  51 {
  52   struct font font;
  53   TEXTMETRICW metrics;
  54   unsigned int glyph_idx;
  55   struct w32_metric_cache **cached_metrics;
  56   int n_cache_blocks;
  57   HFONT hfont;
  58 };
  59
  60 /* Macros for getting OS specific information from a font struct.  */
  61 #define FONT_HANDLE(f) (((struct w32font_info *)(f))->hfont)
  62 #define FONT_TEXTMETRIC(f) (((struct w32font_info *)(f))->metrics)
  63
  64 #define CACHE_BLOCKSIZE 128
  65
  66 Lisp_Object w32font_get_cache (struct frame *fe);
  67 Lisp_Object w32font_list_internal (struct frame *f,
  68                                    Lisp_Object font_spec,
  69                                    bool opentype_only);
  70 Lisp_Object w32font_match_internal (struct frame *f,
  71                                     Lisp_Object font_spec,
  72                                     bool opentype_only);
  73 int w32font_open_internal (struct frame *f, Lisp_Object font_entity,
  74                            int pixel_size, Lisp_Object font_object);
  75 void w32font_close (struct font *font);
  76 int w32font_has_char (Lisp_Object entity, int c);
  77 void w32font_text_extents (struct font *font, unsigned *code, int nglyphs,
  78                            struct font_metrics *metrics);
  79 int w32font_draw (struct glyph_string *s, int from, int to,
  80                   int x, int y, bool with_background);
  81
  82
  83 int uniscribe_check_otf (LOGFONT *font, Lisp_Object otf_spec);
  84
  85 Lisp_Object intern_font_name (char *);
  86
  87 extern void globals_of_w32font (void);
  88
  89 #endif