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 unsigned int blob_length;
65 const char *blob_data = hb_blob_get_data (font_opts->blob, &blob_length);
66
67 if (FT_New_Memory_Face (ft_library,
68 (const FT_Byte *) blob_data,
69 blob_length,
70 font_opts->face_index,
71 &ft_face))
72 fail (false, "FT_New_Memory_Face fail");
73 }
74 if (!ft_face)
75 {
76 /* This allows us to get some boxes at least... */
77 cairo_face = cairo_toy_font_face_create ("@cairo:sans",
78 CAIRO_FONT_SLANT_NORMAL,
79 CAIRO_FONT_WEIGHT_NORMAL);
80 }
81 else
82 {
83 #if !defined(HB_NO_VAR) && defined(HAVE_FT_SET_VAR_BLEND_COORDINATES)
84 unsigned int num_coords;
85 const float *coords = hb_font_get_var_coords_design (font_opts->font, &num_coords);
86 if (num_coords)
87 {
88 FT_Fixed *ft_coords = (FT_Fixed *) calloc (num_coords, sizeof (FT_Fixed));
89 if (ft_coords)
90 {
91 for (unsigned int i = 0; i < num_coords; i++)
92 ft_coords[i] = coords[i] * 65536.f;
93 FT_Set_Var_Design_Coordinates (ft_face, num_coords, ft_coords);
94 free (ft_coords);
95 }
96 }
97 #endif
98
99 cairo_face = cairo_ft_font_face_create_for_ft_face (ft_face, font_opts->ft_load_flags);
100 }
101 return cairo_face;
102 }
103
104 static inline bool
helper_cairo_ft_scaled_font_has_color(cairo_scaled_font_t * scaled_font)105 helper_cairo_ft_scaled_font_has_color (cairo_scaled_font_t *scaled_font)
106 {
107 bool ret = false;
108 #ifdef FT_HAS_COLOR
109 FT_Face ft_face = cairo_ft_scaled_font_lock_face (scaled_font);
110 if (ft_face)
111 {
112 if (FT_HAS_COLOR (ft_face))
113 ret = true;
114 cairo_ft_scaled_font_unlock_face (scaled_font);
115 }
116 #endif
117 return ret;
118 }
119
120 #endif
121