Mercurial > hgrepos > Python2 > PyMuPDF

comparison mupdf-source/source/pdf/pdf-resources.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 "mupdf/pdf.h"
25
26 #include <string.h>
27
28 static void pdf_drop_obj_as_void(fz_context *ctx, void *obj)
29 {
30 pdf_drop_obj(ctx, obj);
31 }
32
33 /* We do need to come up with an effective way to see what is already in the
34 * file to avoid adding to what is already there. This is avoided for pdfwrite
35 * as we check as we add each font. For adding text to an existing file though
36 * it may be more problematic. */
37
38 pdf_obj *
39 pdf_find_font_resource(fz_context *ctx, pdf_document *doc, int type, int encoding, fz_font *item, pdf_font_resource_key *key)
40 {
41 pdf_obj *res;
42
43 if (!doc->resources.fonts)
44 doc->resources.fonts = fz_new_hash_table(ctx, 4096, sizeof(*key), -1, pdf_drop_obj_as_void);
45
46 memset(key, 0, sizeof(*key));
47 fz_font_digest(ctx, item, key->digest);
48
49 key->type = type;
50 key->encoding = encoding;
51 key->local_xref = doc->local_xref_nesting > 0;
52
53 res = fz_hash_find(ctx, doc->resources.fonts, (void *)key);
54 if (res)
55 pdf_keep_obj(ctx, res);
56 return res;
57 }
58
59 pdf_obj *
60 pdf_find_colorspace_resource(fz_context *ctx, pdf_document *doc, fz_colorspace *item, pdf_colorspace_resource_key *key)
61 {
62 pdf_obj *res;
63
64 if (!doc->resources.colorspaces)
65 doc->resources.colorspaces = fz_new_hash_table(ctx, 4096, sizeof(*key), -1, pdf_drop_obj_as_void);
66
67 memset(key, 0, sizeof(*key));
68 fz_colorspace_digest(ctx, item, key->digest);
69
70 key->local_xref = doc->local_xref_nesting > 0;
71
72 res = fz_hash_find(ctx, doc->resources.colorspaces, (void *)key);
73 if (res)
74 pdf_keep_obj(ctx, res);
75 return res;
76 }
77
78 pdf_obj *
79 pdf_insert_font_resource(fz_context *ctx, pdf_document *doc, pdf_font_resource_key *key, pdf_obj *obj)
80 {
81 pdf_obj *res = fz_hash_insert(ctx, doc->resources.fonts, (void *)key, obj);
82 if (res)
83 fz_warn(ctx, "warning: font resource already present");
84 else
85 res = pdf_keep_obj(ctx, obj);
86 return pdf_keep_obj(ctx, res);
87 }
88
89 pdf_obj *
90 pdf_insert_colorspace_resource(fz_context *ctx, pdf_document *doc, pdf_colorspace_resource_key *key, pdf_obj *obj)
91 {
92 pdf_obj *res = fz_hash_insert(ctx, doc->resources.colorspaces, (void *)key, obj);
93 if (res)
94 fz_warn(ctx, "warning: colorspace resource already present");
95 else
96 res = pdf_keep_obj(ctx, obj);
97 return pdf_keep_obj(ctx, res);
98 }
99
100 static int purge_local_font_resource(fz_context *ctx, void *state, void *key_, int keylen, void *val)
101 {
102 pdf_font_resource_key *key = key_;
103 if (key->local_xref)
104 {
105 pdf_drop_obj(ctx, val);
106 return 1;
107 }
108 return 0;
109 }
110
111 static int purge_local_colorspace_resource(fz_context *ctx, void *state, void *key_, int keylen, void *val)
112 {
113 pdf_colorspace_resource_key *key = key_;
114 if (key->local_xref)
115 {
116 pdf_drop_obj(ctx, val);
117 return 1;
118 }
119 return 0;
120 }
121
122 void
123 pdf_purge_local_resources(fz_context *ctx, pdf_document *doc)
124 {
125 if (doc->resources.fonts)
126 fz_hash_filter(ctx, doc->resources.fonts, NULL, purge_local_font_resource);
127 if (doc->resources.colorspaces)
128 fz_hash_filter(ctx, doc->resources.colorspaces, NULL, purge_local_colorspace_resource);
129 }
130
131 void
132 pdf_drop_resource_tables(fz_context *ctx, pdf_document *doc)
133 {
134 if (doc)
135 {
136 fz_drop_hash_table(ctx, doc->resources.colorspaces);
137 fz_drop_hash_table(ctx, doc->resources.fonts);
138 }
139 }