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| | /* Shared GDI and Uniscribe Font backend declarations for the Windows API.
Copyright (C) 2007-2024 Free Software Foundation, Inc.
This file is part of GNU Emacs.
GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at
your option) any later version.
GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>. */
#ifndef EMACS_W32FONT_H
#define EMACS_W32FONT_H
#include "font.h"
/* Bit 17 of ntmFlags in NEWTEXTMETRIC is set for PostScript OpenType fonts,
bit 18 for TrueType OpenType fonts, bit 20 for Type1 fonts. */
#ifndef NTM_PS_OPENTYPE
#define NTM_PS_OPENTYPE 0x00020000
#endif
#ifndef NTM_TT_OPENTYPE
#define NTM_TT_OPENTYPE 0x00040000
#endif
#ifndef NTM_TYPE1
#define NTM_TYPE1 0x00100000
#endif
#define NTMFLAGS_OPENTYPE (NTM_PS_OPENTYPE | NTM_TT_OPENTYPE)
struct w32_metric_cache
{
short lbearing, rbearing, width, ascent, descent;
unsigned char status;
};
#define W32METRIC_NO_ATTEMPT 0
#define W32METRIC_SUCCESS 1
#define W32METRIC_FAIL 2
/* The actual structure for a w32 font, that can be cast to struct font.
The Uniscribe backend extends this. */
struct w32font_info
{
struct font font;
TEXTMETRICW metrics;
unsigned int glyph_idx;
struct w32_metric_cache **cached_metrics;
int n_cache_blocks;
HFONT hfont;
};
/* Macros for getting OS specific information from a font struct. */
#define FONT_HANDLE(f) (((struct w32font_info *)(f))->hfont)
#define FONT_TEXTMETRIC(f) (((struct w32font_info *)(f))->metrics)
#define CACHE_BLOCKSIZE 128
Lisp_Object w32font_get_cache (struct frame *fe);
Lisp_Object w32font_list_internal (struct frame *f,
Lisp_Object font_spec,
bool opentype_only);
Lisp_Object w32font_match_internal (struct frame *f,
Lisp_Object font_spec,
bool opentype_only);
int w32font_open_internal (struct frame *f, Lisp_Object font_entity,
int pixel_size, Lisp_Object font_object);
void w32font_close (struct font *font);
int w32font_has_char (Lisp_Object entity, int c);
void w32font_text_extents (struct font *font, const unsigned *code, int nglyphs,
struct font_metrics *metrics);
int w32font_draw (struct glyph_string *s, int from, int to,
int x, int y, bool with_background);
int uniscribe_check_otf (LOGFONT *font, Lisp_Object otf_spec);
Lisp_Object intern_font_name (char *);
/* Function prototypes for DirectWrite. */
void w32_initialize_direct_write (void);
bool w32_use_direct_write (struct w32font_info *w32font);
void w32_dwrite_draw (HDC hdc, int x, int y, unsigned *glyphs, int len,
COLORREF color, struct font *font );
void w32_dwrite_text_extents (struct font *font, const unsigned *code,
int nglyphs, struct font_metrics *metrics);
unsigned w32_dwrite_encode_char (struct font *font, int c);
void w32_dwrite_free_cached_face(void *cache);
void *w32_font_get_dwrite_cache (struct font *font, float *font_size);
void w32_font_set_dwrite_cache (struct font *font, void *cache,
float font_size);
extern void globals_of_w32font (void);
#endif
|