1 /*
2 * Copyright 2013 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "SkPDFResourceDict.h"
9 #include "SkPDFTypes.h"
10 #include "SkPostConfig.h"
11
12 // Sanity check that the values of enum SkPDFResourceType correspond to the
13 // expected values as defined in the arrays below.
14 // If these are failing, you may need to update the resource_type_prefixes
15 // and resource_type_names arrays below.
16 static_assert(SkPDFResourceDict::kExtGState_ResourceType == 0, "resource_type_mismatch");
17 static_assert(SkPDFResourceDict::kPattern_ResourceType == 1, "resource_type_mismatch");
18 static_assert(SkPDFResourceDict::kXObject_ResourceType == 2, "resource_type_mismatch");
19 static_assert(SkPDFResourceDict::kFont_ResourceType == 3, "resource_type_mismatch");
20
21 static const char resource_type_prefixes[] = {
22 'G',
23 'P',
24 'X',
25 'F'
26 };
27
28 static const char* resource_type_names[] = {
29 "ExtGState",
30 "Pattern",
31 "XObject",
32 "Font"
33 };
34
GetResourceTypePrefix(SkPDFResourceDict::SkPDFResourceType type)35 char SkPDFResourceDict::GetResourceTypePrefix(
36 SkPDFResourceDict::SkPDFResourceType type) {
37 SkASSERT(type >= 0);
38 SkASSERT(type < SkPDFResourceDict::kResourceTypeCount);
39
40 return resource_type_prefixes[type];
41 }
42
get_resource_type_name(SkPDFResourceDict::SkPDFResourceType type)43 static const char* get_resource_type_name(
44 SkPDFResourceDict::SkPDFResourceType type) {
45 SkASSERT(type >= 0);
46 SkASSERT(type < SK_ARRAY_COUNT(resource_type_names));
47
48 return resource_type_names[type];
49 }
50
getResourceName(SkPDFResourceDict::SkPDFResourceType type,int key)51 SkString SkPDFResourceDict::getResourceName(
52 SkPDFResourceDict::SkPDFResourceType type, int key) {
53 return SkStringPrintf("%c%d", SkPDFResourceDict::GetResourceTypePrefix(type), key);
54 }
55
add_subdict(const SkTDArray<SkPDFObject * > & resourceList,SkPDFResourceDict::SkPDFResourceType type,SkPDFDict * dst)56 static void add_subdict(
57 const SkTDArray<SkPDFObject*>& resourceList,
58 SkPDFResourceDict::SkPDFResourceType type,
59 SkPDFDict* dst) {
60 if (0 == resourceList.count()) {
61 return;
62 }
63 auto resources = sk_make_sp<SkPDFDict>();
64 for (int i = 0; i < resourceList.count(); i++) {
65 resources->insertObjRef(SkPDFResourceDict::getResourceName(type, i),
66 sk_ref_sp(resourceList[i]));
67 }
68 dst->insertObject(get_resource_type_name(type), std::move(resources));
69 }
70
Make(const SkTDArray<SkPDFObject * > * gStateResources,const SkTDArray<SkPDFObject * > * patternResources,const SkTDArray<SkPDFObject * > * xObjectResources,const SkTDArray<SkPDFObject * > * fontResources)71 sk_sp<SkPDFDict> SkPDFResourceDict::Make(
72 const SkTDArray<SkPDFObject*>* gStateResources,
73 const SkTDArray<SkPDFObject*>* patternResources,
74 const SkTDArray<SkPDFObject*>* xObjectResources,
75 const SkTDArray<SkPDFObject*>* fontResources) {
76 auto dict = sk_make_sp<SkPDFDict>();
77 static const char kProcs[][7] = {
78 "PDF", "Text", "ImageB", "ImageC", "ImageI"};
79 auto procSets = sk_make_sp<SkPDFArray>();
80
81 procSets->reserve(SK_ARRAY_COUNT(kProcs));
82 for (size_t i = 0; i < SK_ARRAY_COUNT(kProcs); i++) {
83 procSets->appendName(kProcs[i]);
84 }
85 dict->insertObject("ProcSets", std::move(procSets));
86
87 if (gStateResources) {
88 add_subdict(*gStateResources, kExtGState_ResourceType, dict.get());
89 }
90 if (patternResources) {
91 add_subdict(*patternResources, kPattern_ResourceType, dict.get());
92 }
93 if (xObjectResources) {
94 add_subdict(*xObjectResources, kXObject_ResourceType, dict.get());
95 }
96 if (fontResources) {
97 add_subdict(*fontResources, kFont_ResourceType, dict.get());
98 }
99 return dict;
100 }
101