Mercurial > hgrepos > Python2 > PyMuPDF

comparison mupdf-source/source/html/html-font.c @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1:1d09e1dec1d9 2:b50eed0cc0ef
1 // Copyright (C) 2004-2025 Artifex Software, Inc.
2 //
3 // This file is part of MuPDF.
4 //
5 // MuPDF is free software: you can redistribute it and/or modify it under the
6 // terms of the GNU Affero General Public License as published by the Free
7 // Software Foundation, either version 3 of the License, or (at your option)
8 // any later version.
9 //
10 // MuPDF is distributed in the hope that it will be useful, but WITHOUT ANY
11 // WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
12 // FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
13 // details.
14 //
15 // You should have received a copy of the GNU Affero General Public License
16 // along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html>
17 //
18 // Alternative licensing terms are available from the licensor.
19 // For commercial licensing, see <https://www.artifex.com/> or contact
20 // Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
21 // CA 94129, USA, for further information.
22
23 #include "mupdf/fitz.h"
24 #include "html-imp.h"
25
26 #include <string.h>
27
28 static fz_font *
29 fz_load_html_default_font(fz_context *ctx, fz_html_font_set *set, const char *family, int is_bold, int is_italic)
30 {
31 int is_mono = !strcmp(family, "monospace");
32 int is_sans = !strcmp(family, "sans-serif");
33 const char *real_family = is_mono ? "Courier" : is_sans ? "Helvetica" : "Charis SIL";
34 const char *backup_family = is_mono ? "Courier" : is_sans ? "Helvetica" : "Times";
35 int idx = (is_mono ? 8 : is_sans ? 4 : 0) + is_bold * 2 + is_italic;
36 if (!set->fonts[idx])
37 {
38 const unsigned char *data;
39 int size;
40
41 data = fz_lookup_builtin_font(ctx, real_family, is_bold, is_italic, &size);
42 if (!data)
43 data = fz_lookup_builtin_font(ctx, backup_family, is_bold, is_italic, &size);
44 if (!data)
45 fz_throw(ctx, FZ_ERROR_UNSUPPORTED, "cannot load html font: %s", real_family);
46 set->fonts[idx] = fz_new_font_from_memory(ctx, NULL, data, size, 0, 1);
47 fz_font_flags(set->fonts[idx])->is_serif = !is_sans;
48 }
49 return set->fonts[idx];
50 }
51
52 void
53 fz_add_html_font_face(fz_context *ctx, fz_html_font_set *set,
54 const char *family, int is_bold, int is_italic, int is_small_caps,
55 const char *src, fz_font *font)
56 {
57 fz_html_font_face *custom = fz_malloc_struct(ctx, fz_html_font_face);
58 fz_font_flags_t *flags;
59
60 flags = fz_font_flags(font);
61 if (is_bold && !flags->is_bold)
62 flags->fake_bold = 1;
63 if (is_italic && !flags->is_italic)
64 flags->fake_italic = 1;
65
66 fz_try(ctx)
67 {
68 custom->font = fz_keep_font(ctx, font);
69 custom->src = fz_strdup(ctx, src);
70 custom->family = fz_strdup(ctx, family);
71 custom->is_bold = is_bold;
72 custom->is_italic = is_italic;
73 custom->is_small_caps = is_small_caps;
74 custom->next = set->custom;
75 set->custom = custom;
76 }
77 fz_catch(ctx)
78 {
79 fz_drop_font(ctx, custom->font);
80 fz_free(ctx, custom->src);
81 fz_free(ctx, custom->family);
82 fz_rethrow(ctx);
83 }
84 }
85
86 fz_font *
87 fz_load_html_font(fz_context *ctx, fz_html_font_set *set,
88 const char *family, int is_bold, int is_italic, int is_small_caps)
89 {
90 fz_html_font_face *custom;
91 const unsigned char *data;
92 int best_score = 0;
93 fz_font *best_font = NULL;
94 fz_font *font;
95 int size;
96
97 for (custom = set->custom; custom; custom = custom->next)
98 {
99 if (!strcmp(family, custom->family))
100 {
101 int score =
102 1 * (is_bold == custom->is_bold) +
103 2 * (is_italic == custom->is_italic) +
104 4 * (is_small_caps == custom->is_small_caps);
105 if (score > best_score)
106 {
107 best_score = score;
108 best_font = custom->font;
109 }
110 }
111 }
112
113 // We found a perfect match!
114 if (best_font && best_score == 1 + 2 + 4)
115 return best_font;
116
117 // Try to load a perfect match.
118 data = fz_lookup_builtin_font(ctx, family, is_bold, is_italic, &size);
119 if (!data)
120 data = fz_lookup_builtin_font(ctx, family, 0, 0, &size);
121 if (data)
122 {
123 font = fz_new_font_from_memory(ctx, NULL, data, size, 0, 0);
124 fz_try(ctx)
125 fz_add_html_font_face(ctx, set, family, is_bold, is_italic, 0, "<builtin>", font);
126 fz_always(ctx)
127 fz_drop_font(ctx, font);
128 fz_catch(ctx)
129 fz_rethrow(ctx);
130 return font;
131 }
132 else
133 {
134 font = fz_load_system_font(ctx, family, is_bold, is_italic, 0);
135 if (font)
136 {
137 fz_try(ctx)
138 fz_add_html_font_face(ctx, set, family, is_bold, is_italic, 0, "<system>", font);
139 fz_always(ctx)
140 fz_drop_font(ctx, font);
141 fz_catch(ctx)
142 fz_rethrow(ctx);
143 return font;
144 }
145 }
146
147 // Use the imperfect match from before.
148 if (best_font)
149 return best_font;
150
151 // Handle the "default" font aliases.
152 if (!strcmp(family, "monospace") || !strcmp(family, "sans-serif") || !strcmp(family, "serif"))
153 return fz_load_html_default_font(ctx, set, family, is_bold, is_italic);
154
155 return NULL;
156 }
157
158 fz_html_font_set *fz_new_html_font_set(fz_context *ctx)
159 {
160 return fz_malloc_struct(ctx, fz_html_font_set);
161 }
162
163 void fz_drop_html_font_set(fz_context *ctx, fz_html_font_set *set)
164 {
165 fz_html_font_face *font, *next;
166 int i;
167
168 if (!set)
169 return;
170
171 font = set->custom;
172 while (font)
173 {
174 next = font->next;
175 fz_drop_font(ctx, font->font);
176 fz_free(ctx, font->src);
177 fz_free(ctx, font->family);
178 fz_free(ctx, font);
179 font = next;
180 }
181
182 for (i = 0; i < (int)nelem(set->fonts); ++i)
183 fz_drop_font(ctx, set->fonts[i]);
184
185 fz_free(ctx, set);
186 }