1
2 /*
3 * Copyright 2010 The Android Open Source Project
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8
9
10 #include "SkPDFCatalog.h"
11 #include "SkPDFDevice.h"
12 #include "SkPDFPage.h"
13 #include "SkPDFResourceDict.h"
14 #include "SkStream.h"
15
SkPDFPage(SkPDFDevice * content)16 SkPDFPage::SkPDFPage(SkPDFDevice* content)
17 : SkPDFDict("Page"),
18 fDevice(content) {
19 SkSafeRef(content);
20 }
21
~SkPDFPage()22 SkPDFPage::~SkPDFPage() {}
23
finalizePage(SkPDFCatalog * catalog,bool firstPage,const SkTSet<SkPDFObject * > & knownResourceObjects,SkTSet<SkPDFObject * > * newResourceObjects)24 void SkPDFPage::finalizePage(SkPDFCatalog* catalog, bool firstPage,
25 const SkTSet<SkPDFObject*>& knownResourceObjects,
26 SkTSet<SkPDFObject*>* newResourceObjects) {
27 SkPDFResourceDict* resourceDict = fDevice->getResourceDict();
28 if (fContentStream.get() == NULL) {
29 insert("Resources", resourceDict);
30 SkSafeUnref(this->insert("MediaBox", fDevice->copyMediaBox()));
31 if (!SkToBool(catalog->getDocumentFlags() &
32 SkPDFDocument::kNoLinks_Flags)) {
33 SkPDFArray* annots = fDevice->getAnnotations();
34 if (annots && annots->size() > 0) {
35 insert("Annots", annots);
36 }
37 }
38
39 SkAutoTUnref<SkStream> content(fDevice->content());
40 fContentStream.reset(new SkPDFStream(content.get()));
41 insert("Contents", new SkPDFObjRef(fContentStream.get()))->unref();
42 }
43 catalog->addObject(fContentStream.get(), firstPage);
44 resourceDict->getReferencedResources(knownResourceObjects,
45 newResourceObjects,
46 true);
47 }
48
getPageSize(SkPDFCatalog * catalog,off_t fileOffset)49 off_t SkPDFPage::getPageSize(SkPDFCatalog* catalog, off_t fileOffset) {
50 SkASSERT(fContentStream.get() != NULL);
51 catalog->setFileOffset(fContentStream.get(), fileOffset);
52 return fContentStream->getOutputSize(catalog, true);
53 }
54
emitPage(SkWStream * stream,SkPDFCatalog * catalog)55 void SkPDFPage::emitPage(SkWStream* stream, SkPDFCatalog* catalog) {
56 SkASSERT(fContentStream.get() != NULL);
57 fContentStream->emitObject(stream, catalog, true);
58 }
59
60 // static
GeneratePageTree(const SkTDArray<SkPDFPage * > & pages,SkPDFCatalog * catalog,SkTDArray<SkPDFDict * > * pageTree,SkPDFDict ** rootNode)61 void SkPDFPage::GeneratePageTree(const SkTDArray<SkPDFPage*>& pages,
62 SkPDFCatalog* catalog,
63 SkTDArray<SkPDFDict*>* pageTree,
64 SkPDFDict** rootNode) {
65 // PDF wants a tree describing all the pages in the document. We arbitrary
66 // choose 8 (kNodeSize) as the number of allowed children. The internal
67 // nodes have type "Pages" with an array of children, a parent pointer, and
68 // the number of leaves below the node as "Count." The leaves are passed
69 // into the method, have type "Page" and need a parent pointer. This method
70 // builds the tree bottom up, skipping internal nodes that would have only
71 // one child.
72 static const int kNodeSize = 8;
73
74 SkAutoTUnref<SkPDFName> kidsName(new SkPDFName("Kids"));
75 SkAutoTUnref<SkPDFName> countName(new SkPDFName("Count"));
76 SkAutoTUnref<SkPDFName> parentName(new SkPDFName("Parent"));
77
78 // curNodes takes a reference to its items, which it passes to pageTree.
79 SkTDArray<SkPDFDict*> curNodes;
80 curNodes.setReserve(pages.count());
81 for (int i = 0; i < pages.count(); i++) {
82 SkSafeRef(pages[i]);
83 curNodes.push(pages[i]);
84 }
85
86 // nextRoundNodes passes its references to nodes on to curNodes.
87 SkTDArray<SkPDFDict*> nextRoundNodes;
88 nextRoundNodes.setReserve((pages.count() + kNodeSize - 1)/kNodeSize);
89
90 int treeCapacity = kNodeSize;
91 do {
92 for (int i = 0; i < curNodes.count(); ) {
93 if (i > 0 && i + 1 == curNodes.count()) {
94 nextRoundNodes.push(curNodes[i]);
95 break;
96 }
97
98 SkPDFDict* newNode = new SkPDFDict("Pages");
99 SkAutoTUnref<SkPDFObjRef> newNodeRef(new SkPDFObjRef(newNode));
100
101 SkAutoTUnref<SkPDFArray> kids(new SkPDFArray);
102 kids->reserve(kNodeSize);
103
104 int count = 0;
105 for (; i < curNodes.count() && count < kNodeSize; i++, count++) {
106 curNodes[i]->insert(parentName.get(), newNodeRef.get());
107 kids->append(new SkPDFObjRef(curNodes[i]))->unref();
108
109 // TODO(vandebo): put the objects in strict access order.
110 // Probably doesn't matter because they are so small.
111 if (curNodes[i] != pages[0]) {
112 pageTree->push(curNodes[i]); // Transfer reference.
113 catalog->addObject(curNodes[i], false);
114 } else {
115 SkSafeUnref(curNodes[i]);
116 catalog->addObject(curNodes[i], true);
117 }
118 }
119
120 // treeCapacity is the number of leaf nodes possible for the
121 // current set of subtrees being generated. (i.e. 8, 64, 512, ...).
122 // It is hard to count the number of leaf nodes in the current
123 // subtree. However, by construction, we know that unless it's the
124 // last subtree for the current depth, the leaf count will be
125 // treeCapacity, otherwise it's what ever is left over after
126 // consuming treeCapacity chunks.
127 int pageCount = treeCapacity;
128 if (i == curNodes.count()) {
129 pageCount = ((pages.count() - 1) % treeCapacity) + 1;
130 }
131 newNode->insert(countName.get(), new SkPDFInt(pageCount))->unref();
132 newNode->insert(kidsName.get(), kids.get());
133 nextRoundNodes.push(newNode); // Transfer reference.
134 }
135
136 curNodes = nextRoundNodes;
137 nextRoundNodes.rewind();
138 treeCapacity *= kNodeSize;
139 } while (curNodes.count() > 1);
140
141 pageTree->push(curNodes[0]); // Transfer reference.
142 catalog->addObject(curNodes[0], false);
143 if (rootNode) {
144 *rootNode = curNodes[0];
145 }
146 }
147
getFontResources() const148 const SkTDArray<SkPDFFont*>& SkPDFPage::getFontResources() const {
149 return fDevice->getFontResources();
150 }
151
getFontGlyphUsage() const152 const SkPDFGlyphSetMap& SkPDFPage::getFontGlyphUsage() const {
153 return fDevice->getFontGlyphUsage();
154 }
155
appendDestinations(SkPDFDict * dict)156 void SkPDFPage::appendDestinations(SkPDFDict* dict) {
157 fDevice->appendDestinations(dict, this);
158 }
159