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comparison: gfx/skia/trunk/src/pdf/SkPDFPage.cpp
gfx/skia/trunk/src/pdf/SkPDFPage.cpp
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:60fa8b57d0b3 |
|---|---|
| 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 | |
| 16 SkPDFPage::SkPDFPage(SkPDFDevice* content) | |
| 17 : SkPDFDict("Page"), | |
| 18 fDevice(content) { | |
| 19 SkSafeRef(content); | |
| 20 } | |
| 21 | |
| 22 SkPDFPage::~SkPDFPage() {} | |
| 23 | |
| 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 | |
| 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 | |
| 55 void SkPDFPage::emitPage(SkWStream* stream, SkPDFCatalog* catalog) { | |
| 56 SkASSERT(fContentStream.get() != NULL); | |
| 57 fContentStream->emitObject(stream, catalog, true); | |
| 58 } | |
| 59 | |
| 60 // static | |
| 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 | |
| 148 const SkTDArray<SkPDFFont*>& SkPDFPage::getFontResources() const { | |
| 149 return fDevice->getFontResources(); | |
| 150 } | |
| 151 | |
| 152 const SkPDFGlyphSetMap& SkPDFPage::getFontGlyphUsage() const { | |
| 153 return fDevice->getFontGlyphUsage(); | |
| 154 } | |
| 155 | |
| 156 void SkPDFPage::appendDestinations(SkPDFDict* dict) { | |
| 157 fDevice->appendDestinations(dict, this); | |
| 158 } |
