1 /*
2 * Copyright © 2022 Google, Inc.
3 *
4 * This is part of HarfBuzz, a text shaping library.
5 *
6 * Permission is hereby granted, without written agreement and without
7 * license or royalty fees, to use, copy, modify, and distribute this
8 * software and its documentation for any purpose, provided that the
9 * above copyright notice and the following two paragraphs appear in
10 * all copies of this software.
11 *
12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
16 * DAMAGE.
17 *
18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
23 *
24 * Google Author(s): Behdad Esfahbod
25 */
26
27 #ifndef HELPER_CAIRO_FT_HH
28 #define HELPER_CAIRO_FT_HH
29
30 #include "font-options.hh"
31
32 #include <cairo-ft.h>
33 #include <hb-ft.h>
34 #include FT_MULTIPLE_MASTERS_H
35
36 static FT_Library ft_library;
37
38 #ifdef HAVE_ATEXIT
39 static inline
free_ft_library()40 void free_ft_library ()
41 {
42 FT_Done_FreeType (ft_library);
43 }
44 #endif
45
46 static inline cairo_font_face_t *
helper_cairo_create_ft_font_face(const font_options_t * font_opts)47 helper_cairo_create_ft_font_face (const font_options_t *font_opts)
48 {
49 cairo_font_face_t *cairo_face;
50 /* We cannot use the FT_Face from hb_font_t, as doing so will confuse hb_font_t because
51 * cairo will reset the face size. As such, create new face...
52 * TODO Perhaps add API to hb-ft to encapsulate this code. */
53 FT_Face ft_face = nullptr;//hb_ft_font_get_face (font);
54 if (!ft_face)
55 {
56 if (!ft_library)
57 {
58 FT_Init_FreeType (&ft_library);
59 #ifdef HAVE_ATEXIT
60 atexit (free_ft_library);
61 #endif
62 }
63
64 if (FT_New_Face (ft_library,
65 font_opts->font_file,
66 font_opts->face_index,
67 &ft_face))
68 fail (false, "FT_New_Face fail");
69 }
70 if (!ft_face)
71 {
72 /* This allows us to get some boxes at least... */
73 cairo_face = cairo_toy_font_face_create ("@cairo:sans",
74 CAIRO_FONT_SLANT_NORMAL,
75 CAIRO_FONT_WEIGHT_NORMAL);
76 }
77 else
78 {
79 #if !defined(HB_NO_VAR) && defined(HAVE_FT_SET_VAR_BLEND_COORDINATES)
80 unsigned int num_coords;
81 const float *coords = hb_font_get_var_coords_design (font_opts->font, &num_coords);
82 if (num_coords)
83 {
84 FT_Fixed *ft_coords = (FT_Fixed *) calloc (num_coords, sizeof (FT_Fixed));
85 if (ft_coords)
86 {
87 for (unsigned int i = 0; i < num_coords; i++)
88 ft_coords[i] = coords[i] * 65536.f;
89 FT_Set_Var_Design_Coordinates (ft_face, num_coords, ft_coords);
90 free (ft_coords);
91 }
92 }
93 #endif
94
95 cairo_face = cairo_ft_font_face_create_for_ft_face (ft_face, font_opts->ft_load_flags);
96 }
97 return cairo_face;
98 }
99
100 static inline bool
helper_cairo_ft_scaled_font_has_color(cairo_scaled_font_t * scaled_font)101 helper_cairo_ft_scaled_font_has_color (cairo_scaled_font_t *scaled_font)
102 {
103 bool ret = false;
104 #ifdef FT_HAS_COLOR
105 FT_Face ft_face = cairo_ft_scaled_font_lock_face (scaled_font);
106 if (ft_face)
107 {
108 if (FT_HAS_COLOR (ft_face))
109 ret = true;
110 cairo_ft_scaled_font_unlock_face (scaled_font);
111 }
112 #endif
113 return ret;
114 }
115
116 #endif
117