1 /* 2 * Copyright 2016 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 #ifndef SkPDFDocumentPriv_DEFINED 8 #define SkPDFDocumentPriv_DEFINED 9 10 #include "include/core/SkCanvas.h" 11 #include "include/core/SkStream.h" 12 #include "include/docs/SkPDFDocument.h" 13 #include "include/private/SkMutex.h" 14 #include "include/private/SkTHash.h" 15 #include "src/pdf/SkPDFMetadata.h" 16 #include "src/pdf/SkPDFTag.h" 17 18 #include <atomic> 19 #include <vector> 20 #include <memory> 21 22 class SkExecutor; 23 class SkPDFDevice; 24 class SkPDFFont; 25 struct SkAdvancedTypefaceMetrics; 26 struct SkBitmapKey; 27 struct SkPDFFillGraphicState; 28 struct SkPDFImageShaderKey; 29 struct SkPDFStrokeGraphicState; 30 31 namespace SkPDFGradientShader { 32 struct Key; 33 struct KeyHash; 34 } 35 36 const char* SkPDFGetNodeIdKey(); 37 38 // Logically part of SkPDFDocument, but separate to keep similar functionality together. 39 class SkPDFOffsetMap { 40 public: 41 void markStartOfDocument(const SkWStream*); 42 void markStartOfObject(int referenceNumber, const SkWStream*); 43 int objectCount() const; 44 int emitCrossReferenceTable(SkWStream* s) const; 45 private: 46 std::vector<int> fOffsets; 47 size_t fBaseOffset = SIZE_MAX; 48 }; 49 50 51 struct SkPDFNamedDestination { 52 sk_sp<SkData> fName; 53 SkPoint fPoint; 54 SkPDFIndirectReference fPage; 55 }; 56 57 /** Concrete implementation of SkDocument that creates PDF files. This 58 class does not produced linearized or optimized PDFs; instead it 59 it attempts to use a minimum amount of RAM. */ 60 class SkPDFDocument : public SkDocument { 61 public: 62 SkPDFDocument(SkWStream*, SkPDF::Metadata); 63 ~SkPDFDocument() override; 64 SkCanvas* onBeginPage(SkScalar, SkScalar) override; 65 void onEndPage() override; 66 void onClose(SkWStream*) override; 67 void onAbort() override; 68 69 /** 70 Serialize the object, as well as any other objects it 71 indirectly refers to. If any any other objects have been added 72 to the SkPDFObjNumMap without serializing them, they will be 73 serialized as well. 74 75 It might go without saying that objects should not be changed 76 after calling serialize, since those changes will be too late. 77 */ 78 SkPDFIndirectReference emit(const SkPDFObject&, SkPDFIndirectReference); emit(const SkPDFObject & o)79 SkPDFIndirectReference emit(const SkPDFObject& o) { return this->emit(o, this->reserveRef()); } 80 81 template <typename T> emitStream(const SkPDFDict & dict,T writeStream,SkPDFIndirectReference ref)82 void emitStream(const SkPDFDict& dict, T writeStream, SkPDFIndirectReference ref) { 83 SkAutoMutexExclusive lock(fMutex); 84 SkWStream* stream = this->beginObject(ref); 85 dict.emitObject(stream); 86 stream->writeText(" stream\n"); 87 writeStream(stream); 88 stream->writeText("\nendstream"); 89 this->endObject(); 90 } 91 metadata()92 const SkPDF::Metadata& metadata() const { return fMetadata; } 93 94 SkPDFIndirectReference getPage(size_t pageIndex) const; currentPage()95 SkPDFIndirectReference currentPage() const { 96 return SkASSERT(!fPageRefs.empty()), fPageRefs.back(); 97 } 98 // Returns -1 if no mark ID. 99 int getMarkIdForNodeId(int nodeId); 100 reserveRef()101 SkPDFIndirectReference reserveRef() { return SkPDFIndirectReference{fNextObjectNumber++}; } 102 executor()103 SkExecutor* executor() const { return fExecutor; } 104 void incrementJobCount(); 105 void signalJobComplete(); currentPageIndex()106 size_t currentPageIndex() { return fPages.size(); } pageCount()107 size_t pageCount() { return fPageRefs.size(); } 108 109 const SkMatrix& currentPageTransform() const; 110 111 // Canonicalized objects 112 SkTHashMap<SkPDFImageShaderKey, SkPDFIndirectReference> fImageShaderMap; 113 SkTHashMap<SkPDFGradientShader::Key, SkPDFIndirectReference, SkPDFGradientShader::KeyHash> 114 fGradientPatternMap; 115 SkTHashMap<SkBitmapKey, SkPDFIndirectReference> fPDFBitmapMap; 116 SkTHashMap<uint32_t, std::unique_ptr<SkAdvancedTypefaceMetrics>> fTypefaceMetrics; 117 SkTHashMap<uint32_t, std::vector<SkString>> fType1GlyphNames; 118 SkTHashMap<uint32_t, std::vector<SkUnichar>> fToUnicodeMap; 119 SkTHashMap<uint32_t, SkPDFIndirectReference> fFontDescriptors; 120 SkTHashMap<uint32_t, SkPDFIndirectReference> fType3FontDescriptors; 121 SkTHashMap<uint64_t, SkPDFFont> fFontMap; 122 SkTHashMap<SkPDFStrokeGraphicState, SkPDFIndirectReference> fStrokeGSMap; 123 SkTHashMap<SkPDFFillGraphicState, SkPDFIndirectReference> fFillGSMap; 124 SkPDFIndirectReference fInvertFunction; 125 SkPDFIndirectReference fNoSmaskGraphicState; 126 127 std::vector<std::pair<sk_sp<SkData>, SkRect>> fCurrentPageLinkToURLs; 128 std::vector<std::pair<sk_sp<SkData>, SkRect>> fCurrentPageLinkToDestinations; 129 std::vector<SkPDFNamedDestination> fNamedDestinations; 130 131 private: 132 SkPDFOffsetMap fOffsetMap; 133 SkCanvas fCanvas; 134 std::vector<std::unique_ptr<SkPDFDict>> fPages; 135 std::vector<SkPDFIndirectReference> fPageRefs; 136 137 sk_sp<SkPDFDevice> fPageDevice; 138 std::atomic<int> fNextObjectNumber = {1}; 139 std::atomic<int> fJobCount = {0}; 140 SkUUID fUUID; 141 SkPDFIndirectReference fInfoDict; 142 SkPDFIndirectReference fXMP; 143 SkPDF::Metadata fMetadata; 144 SkScalar fRasterScale = 1; 145 SkScalar fInverseRasterScale = 1; 146 SkExecutor* fExecutor = nullptr; 147 148 // For tagged PDFs. 149 SkPDFTagTree fTagTree; 150 151 SkMutex fMutex; 152 SkSemaphore fSemaphore; 153 154 void waitForJobs(); 155 SkWStream* beginObject(SkPDFIndirectReference); 156 void endObject(); 157 }; 158 159 #endif // SkPDFDocumentPriv_DEFINED 160