root/src/w32font.h

INCLUDED FROM

     1 /* Shared GDI and Uniscribe Font backend declarations for the Windows API.
     2    Copyright (C) 2007-2023 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, const 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