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comparison mupdf-source/source/fitz/context.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
25 #include "context-imp.h"
26
27 #include <assert.h>
28 #include <string.h>
29 #include <stdio.h>
30 #include <time.h>
31
32 struct fz_style_context
33 {
34 int refs;
35 char *user_css;
36 int use_document_css;
37 };
38
39 static void fz_new_style_context(fz_context *ctx)
40 {
41 if (ctx)
42 {
43 ctx->style = fz_malloc_struct(ctx, fz_style_context);
44 ctx->style->refs = 1;
45 ctx->style->user_css = NULL;
46 ctx->style->use_document_css = 1;
47 }
48 }
49
50 static fz_style_context *fz_keep_style_context(fz_context *ctx)
51 {
52 if (!ctx)
53 return NULL;
54 return fz_keep_imp(ctx, ctx->style, &ctx->style->refs);
55 }
56
57 static void fz_drop_style_context(fz_context *ctx)
58 {
59 if (!ctx)
60 return;
61 if (fz_drop_imp(ctx, ctx->style, &ctx->style->refs))
62 {
63 fz_free(ctx, ctx->style->user_css);
64 fz_free(ctx, ctx->style);
65 }
66 }
67
68 void fz_set_use_document_css(fz_context *ctx, int use)
69 {
70 ctx->style->use_document_css = use;
71 }
72
73 int fz_use_document_css(fz_context *ctx)
74 {
75 return ctx->style->use_document_css;
76 }
77
78 void fz_set_user_css(fz_context *ctx, const char *user_css)
79 {
80 fz_free(ctx, ctx->style->user_css);
81 ctx->style->user_css = user_css ? fz_strdup(ctx, user_css) : NULL;
82 }
83
84 const char *fz_user_css(fz_context *ctx)
85 {
86 return ctx->style->user_css;
87 }
88
89 void fz_load_user_css(fz_context *ctx, const char *filename)
90 {
91 fz_buffer *buf = NULL;
92 fz_var(buf);
93 fz_try(ctx)
94 {
95 buf = fz_read_file(ctx, filename);
96 fz_set_user_css(ctx, fz_string_from_buffer(ctx, buf));
97 }
98 fz_always(ctx)
99 {
100 fz_drop_buffer(ctx, buf);
101 }
102 fz_catch(ctx)
103 {
104 fz_report_error(ctx);
105 fz_warn(ctx, "cannot read user css file");
106 }
107 }
108
109 static void fz_new_tuning_context(fz_context *ctx)
110 {
111 if (ctx)
112 {
113 ctx->tuning = fz_malloc_struct(ctx, fz_tuning_context);
114 ctx->tuning->refs = 1;
115 ctx->tuning->image_decode = fz_default_image_decode;
116 ctx->tuning->image_scale = fz_default_image_scale;
117 }
118 }
119
120 static fz_tuning_context *fz_keep_tuning_context(fz_context *ctx)
121 {
122 if (!ctx)
123 return NULL;
124 return fz_keep_imp(ctx, ctx->tuning, &ctx->tuning->refs);
125 }
126
127 static void fz_drop_tuning_context(fz_context *ctx)
128 {
129 if (!ctx)
130 return;
131 if (fz_drop_imp(ctx, ctx->tuning, &ctx->tuning->refs))
132 {
133 fz_free(ctx, ctx->tuning);
134 }
135 }
136
137 void fz_tune_image_decode(fz_context *ctx, fz_tune_image_decode_fn *image_decode, void *arg)
138 {
139 ctx->tuning->image_decode = image_decode ? image_decode : fz_default_image_decode;
140 ctx->tuning->image_decode_arg = arg;
141 }
142
143 void fz_tune_image_scale(fz_context *ctx, fz_tune_image_scale_fn *image_scale, void *arg)
144 {
145 ctx->tuning->image_scale = image_scale ? image_scale : fz_default_image_scale;
146 ctx->tuning->image_scale_arg = arg;
147 }
148
149 static void fz_init_random_context(fz_context *ctx)
150 {
151 if (!ctx)
152 return;
153
154 ctx->seed48[0] = 0;
155 ctx->seed48[1] = 0;
156 ctx->seed48[2] = 0;
157 ctx->seed48[3] = 0xe66d;
158 ctx->seed48[4] = 0xdeec;
159 ctx->seed48[5] = 0x5;
160 ctx->seed48[6] = 0xb;
161
162 fz_srand48(ctx, (uint32_t)time(NULL));
163 }
164
165 void
166 fz_drop_context(fz_context *ctx)
167 {
168 int free_master = 0;
169 int call_log = 0;
170
171 if (!ctx)
172 return;
173
174 if (ctx->error.errcode)
175 {
176 fz_flush_warnings(ctx);
177 fz_warn(ctx, "UNHANDLED EXCEPTION!");
178 fz_report_error(ctx);
179 #ifdef CLUSTER
180 abort();
181 #endif
182 }
183
184
185 assert(ctx->master);
186 fz_lock(ctx, FZ_LOCK_ALLOC);
187 ctx->master->context_count--;
188 if (ctx->master->context_count == 0)
189 {
190 call_log = 1;
191 if (ctx->master != ctx)
192 free_master = 1;
193 }
194 fz_unlock(ctx, FZ_LOCK_ALLOC);
195
196 /* We call the log with ctx intact, apart from the master
197 * pointer having had the context_count reduced. The
198 * only possible problem here is if fz_log_activity
199 * clones the context, but it really shouldn't be doing
200 * that! */
201 if (call_log)
202 fz_log_activity(ctx, FZ_ACTIVITY_SHUTDOWN, NULL);
203 if (free_master)
204 ctx->alloc.free(ctx->alloc.user, ctx->master);
205
206 /* Other finalisation calls go here (in reverse order) */
207 fz_drop_document_handler_context(ctx);
208 fz_drop_archive_handler_context(ctx);
209 fz_drop_glyph_cache_context(ctx);
210 fz_drop_store_context(ctx);
211 fz_drop_style_context(ctx);
212 fz_drop_tuning_context(ctx);
213 fz_drop_colorspace_context(ctx);
214 fz_drop_font_context(ctx);
215
216 fz_flush_warnings(ctx);
217
218 assert(ctx->error.top == ctx->error.stack_base);
219
220 /* Free the context itself */
221 if (ctx->master == ctx && ctx->context_count != 0)
222 {
223 /* Need to delay our freeing until all our children have died. */
224 ctx->master = NULL;
225 }
226 else
227 {
228 ctx->alloc.free(ctx->alloc.user, ctx);
229 }
230 }
231
232 static void
233 fz_init_error_context(fz_context *ctx)
234 {
235 #define ALIGN(addr, align) ((((intptr_t)(addr)) + (align-1)) & ~(align-1))
236 ctx->error.stack_base = (fz_error_stack_slot *)ALIGN(ctx->error.stack, FZ_JMPBUF_ALIGN);
237 ctx->error.top = ctx->error.stack_base;
238 ctx->error.errcode = FZ_ERROR_NONE;
239 ctx->error.message[0] = 0;
240
241 ctx->warn.message[0] = 0;
242 ctx->warn.count = 0;
243 }
244
245 fz_context *
246 fz_new_context_imp(const fz_alloc_context *alloc, const fz_locks_context *locks, size_t max_store, const char *version)
247 {
248 fz_context *ctx;
249
250 if (strcmp(version, FZ_VERSION))
251 {
252 fprintf(stderr, "cannot create context: incompatible header (%s) and library (%s) versions\n", version, FZ_VERSION);
253 return NULL;
254 }
255
256 if (!alloc)
257 alloc = &fz_alloc_default;
258
259 if (!locks)
260 locks = &fz_locks_default;
261
262 ctx = Memento_label(alloc->malloc(alloc->user, sizeof(fz_context)), "fz_context");
263 if (!ctx)
264 {
265 fprintf(stderr, "cannot create context (phase 1)\n");
266 return NULL;
267 }
268 memset(ctx, 0, sizeof *ctx);
269
270 ctx->user = NULL;
271 ctx->alloc = *alloc;
272 ctx->locks = *locks;
273
274 /* We are our own master! */
275 ctx->master = ctx;
276 ctx->context_count = 1;
277
278 ctx->error.print = fz_default_error_callback;
279 ctx->warn.print = fz_default_warning_callback;
280
281 fz_init_error_context(ctx);
282 fz_init_aa_context(ctx);
283 fz_init_random_context(ctx);
284
285 /* Now initialise sections that are shared */
286 fz_try(ctx)
287 {
288 fz_new_store_context(ctx, max_store);
289 fz_new_glyph_cache_context(ctx);
290 fz_new_colorspace_context(ctx);
291 fz_new_font_context(ctx);
292 fz_new_document_handler_context(ctx);
293 fz_new_archive_handler_context(ctx);
294 fz_new_style_context(ctx);
295 fz_new_tuning_context(ctx);
296 }
297 fz_catch(ctx)
298 {
299 fz_report_error(ctx);
300 fprintf(stderr, "cannot create context (phase 2)\n");
301 fz_drop_context(ctx);
302 return NULL;
303 }
304 return ctx;
305 }
306
307 fz_context *
308 fz_clone_context(fz_context *ctx)
309 {
310 fz_context *new_ctx;
311
312 /* We cannot safely clone the context without having locking/
313 * unlocking functions. */
314 if (ctx == NULL || (ctx->locks.lock == fz_locks_default.lock && ctx->locks.unlock == fz_locks_default.unlock))
315 return NULL;
316
317 new_ctx = ctx->alloc.malloc(ctx->alloc.user, sizeof(fz_context));
318 if (!new_ctx)
319 return NULL;
320
321 fz_lock(ctx, FZ_LOCK_ALLOC);
322 ctx->master->context_count++;
323 fz_unlock(ctx, FZ_LOCK_ALLOC);
324 new_ctx->master = ctx->master;
325
326 /* First copy old context, including pointers to shared contexts */
327 memcpy(new_ctx, ctx, sizeof (fz_context));
328
329 /* Reset error context to initial state. */
330 fz_init_error_context(new_ctx);
331
332 /* Then keep lock checking happy by keeping shared contexts with new context */
333 fz_keep_document_handler_context(new_ctx);
334 fz_keep_archive_handler_context(new_ctx);
335 fz_keep_style_context(new_ctx);
336 fz_keep_tuning_context(new_ctx);
337 fz_keep_font_context(new_ctx);
338 fz_keep_colorspace_context(new_ctx);
339 fz_keep_store_context(new_ctx);
340 fz_keep_glyph_cache(new_ctx);
341
342 return new_ctx;
343 }
344
345 void fz_set_user_context(fz_context *ctx, void *user)
346 {
347 if (ctx != NULL)
348 ctx->user = user;
349 }
350
351 void *fz_user_context(fz_context *ctx)
352 {
353 if (ctx == NULL)
354 return NULL;
355
356 return ctx->user;
357 }
358
359 void fz_register_activity_logger(fz_context *ctx, fz_activity_fn *activity, void *opaque)
360 {
361 if (ctx == NULL)
362 return;
363
364 ctx->activity.activity = activity;
365 ctx->activity.opaque = opaque;
366 }
367
368 void fz_log_activity(fz_context *ctx, fz_activity_reason reason, void *arg)
369 {
370 if (ctx == NULL || ctx->activity.activity == NULL)
371 return;
372
373 ctx->activity.activity(ctx, ctx->activity.opaque, reason, arg);
374 }
375
376 int fz_new_document_id(fz_context *ctx)
377 {
378 int id;
379
380 fz_lock(ctx, FZ_LOCK_ALLOC);
381 while (ctx->master && ctx->master != ctx)
382 ctx = ctx->master;
383 id = ctx->next_document_id++;
384 fz_unlock(ctx, FZ_LOCK_ALLOC);
385
386 return id;
387 }