| /* |
| * Copyright 2011 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "include/docs/SkPDFDocument.h" |
| #include "src/pdf/SkPDFDocumentPriv.h" |
| |
| #include "include/core/SkStream.h" |
| #include "include/docs/SkPDFDocument.h" |
| #include "include/private/SkTo.h" |
| #include "src/pdf/SkPDFDevice.h" |
| #include "src/pdf/SkPDFFont.h" |
| #include "src/pdf/SkPDFGradientShader.h" |
| #include "src/pdf/SkPDFGraphicState.h" |
| #include "src/pdf/SkPDFShader.h" |
| #include "src/pdf/SkPDFTag.h" |
| #include "src/pdf/SkPDFUtils.h" |
| #include "src/utils/SkUTF.h" |
| |
| #include <utility> |
| |
| // For use in SkCanvas::drawAnnotation |
| const char* SkPDFGetNodeIdKey() { |
| static constexpr char key[] = "PDF_Node_Key"; |
| return key; |
| } |
| |
| static SkString ToValidUtf8String(const SkData& d) { |
| if (d.size() == 0) { |
| SkDEBUGFAIL("Not a valid string, data length is zero."); |
| return SkString(); |
| } |
| |
| const char* c_str = static_cast<const char*>(d.data()); |
| if (c_str[d.size() - 1] != 0) { |
| SkDEBUGFAIL("Not a valid string, not null-terminated."); |
| return SkString(); |
| } |
| |
| // CountUTF8 returns -1 if there's an invalid UTF-8 byte sequence. |
| int valid_utf8_chars_count = SkUTF::CountUTF8(c_str, d.size() - 1); |
| if (valid_utf8_chars_count == -1) { |
| SkDEBUGFAIL("Not a valid UTF-8 string."); |
| return SkString(); |
| } |
| |
| return SkString(c_str, d.size() - 1); |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| void SkPDFOffsetMap::markStartOfDocument(const SkWStream* s) { fBaseOffset = s->bytesWritten(); } |
| |
| static size_t difference(size_t minuend, size_t subtrahend) { |
| return SkASSERT(minuend >= subtrahend), minuend - subtrahend; |
| } |
| |
| void SkPDFOffsetMap::markStartOfObject(int referenceNumber, const SkWStream* s) { |
| SkASSERT(referenceNumber > 0); |
| size_t index = SkToSizeT(referenceNumber - 1); |
| if (index >= fOffsets.size()) { |
| fOffsets.resize(index + 1); |
| } |
| fOffsets[index] = SkToInt(difference(s->bytesWritten(), fBaseOffset)); |
| } |
| |
| int SkPDFOffsetMap::objectCount() const { |
| return SkToInt(fOffsets.size() + 1); // Include the special zeroth object in the count. |
| } |
| |
| int SkPDFOffsetMap::emitCrossReferenceTable(SkWStream* s) const { |
| int xRefFileOffset = SkToInt(difference(s->bytesWritten(), fBaseOffset)); |
| s->writeText("xref\n0 "); |
| s->writeDecAsText(this->objectCount()); |
| s->writeText("\n0000000000 65535 f \n"); |
| for (int offset : fOffsets) { |
| SkASSERT(offset > 0); // Offset was set. |
| s->writeBigDecAsText(offset, 10); |
| s->writeText(" 00000 n \n"); |
| } |
| return xRefFileOffset; |
| } |
| // |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| #define SKPDF_MAGIC "\xD3\xEB\xE9\xE1" |
| #ifndef SK_BUILD_FOR_WIN |
| static_assert((SKPDF_MAGIC[0] & 0x7F) == "Skia"[0], ""); |
| static_assert((SKPDF_MAGIC[1] & 0x7F) == "Skia"[1], ""); |
| static_assert((SKPDF_MAGIC[2] & 0x7F) == "Skia"[2], ""); |
| static_assert((SKPDF_MAGIC[3] & 0x7F) == "Skia"[3], ""); |
| #endif |
| static void serializeHeader(SkPDFOffsetMap* offsetMap, SkWStream* wStream) { |
| offsetMap->markStartOfDocument(wStream); |
| wStream->writeText("%PDF-1.4\n%" SKPDF_MAGIC "\n"); |
| // The PDF spec recommends including a comment with four |
| // bytes, all with their high bits set. "\xD3\xEB\xE9\xE1" is |
| // "Skia" with the high bits set. |
| } |
| #undef SKPDF_MAGIC |
| |
| static void begin_indirect_object(SkPDFOffsetMap* offsetMap, |
| SkPDFIndirectReference ref, |
| SkWStream* s) { |
| offsetMap->markStartOfObject(ref.fValue, s); |
| s->writeDecAsText(ref.fValue); |
| s->writeText(" 0 obj\n"); // Generation number is always 0. |
| } |
| |
| static void end_indirect_object(SkWStream* s) { s->writeText("\nendobj\n"); } |
| |
| // Xref table and footer |
| static void serialize_footer(const SkPDFOffsetMap& offsetMap, |
| SkWStream* wStream, |
| SkPDFIndirectReference infoDict, |
| SkPDFIndirectReference docCatalog, |
| SkUUID uuid) { |
| int xRefFileOffset = offsetMap.emitCrossReferenceTable(wStream); |
| SkPDFDict trailerDict; |
| trailerDict.insertInt("Size", offsetMap.objectCount()); |
| SkASSERT(docCatalog != SkPDFIndirectReference()); |
| trailerDict.insertRef("Root", docCatalog); |
| SkASSERT(infoDict != SkPDFIndirectReference()); |
| trailerDict.insertRef("Info", infoDict); |
| if (SkUUID() != uuid) { |
| trailerDict.insertObject("ID", SkPDFMetadata::MakePdfId(uuid, uuid)); |
| } |
| wStream->writeText("trailer\n"); |
| trailerDict.emitObject(wStream); |
| wStream->writeText("\nstartxref\n"); |
| wStream->writeBigDecAsText(xRefFileOffset); |
| wStream->writeText("\n%%EOF"); |
| } |
| |
| static SkPDFIndirectReference generate_page_tree( |
| SkPDFDocument* doc, |
| std::vector<std::unique_ptr<SkPDFDict>> pages, |
| const std::vector<SkPDFIndirectReference>& pageRefs) { |
| // PDF wants a tree describing all the pages in the document. We arbitrary |
| // choose 8 (kNodeSize) as the number of allowed children. The internal |
| // nodes have type "Pages" with an array of children, a parent pointer, and |
| // the number of leaves below the node as "Count." The leaves are passed |
| // into the method, have type "Page" and need a parent pointer. This method |
| // builds the tree bottom up, skipping internal nodes that would have only |
| // one child. |
| SkASSERT(pages.size() > 0); |
| struct PageTreeNode { |
| std::unique_ptr<SkPDFDict> fNode; |
| SkPDFIndirectReference fReservedRef; |
| int fPageObjectDescendantCount; |
| |
| static std::vector<PageTreeNode> Layer(std::vector<PageTreeNode> vec, SkPDFDocument* doc) { |
| std::vector<PageTreeNode> result; |
| static constexpr size_t kMaxNodeSize = 8; |
| const size_t n = vec.size(); |
| SkASSERT(n >= 1); |
| const size_t result_len = (n - 1) / kMaxNodeSize + 1; |
| SkASSERT(result_len >= 1); |
| SkASSERT(n == 1 || result_len < n); |
| result.reserve(result_len); |
| size_t index = 0; |
| for (size_t i = 0; i < result_len; ++i) { |
| if (n != 1 && index + 1 == n) { // No need to create a new node. |
| result.push_back(std::move(vec[index++])); |
| continue; |
| } |
| SkPDFIndirectReference parent = doc->reserveRef(); |
| auto kids_list = SkPDFMakeArray(); |
| int descendantCount = 0; |
| for (size_t j = 0; j < kMaxNodeSize && index < n; ++j) { |
| PageTreeNode& node = vec[index++]; |
| node.fNode->insertRef("Parent", parent); |
| kids_list->appendRef(doc->emit(*node.fNode, node.fReservedRef)); |
| descendantCount += node.fPageObjectDescendantCount; |
| } |
| auto next = SkPDFMakeDict("Pages"); |
| next->insertInt("Count", descendantCount); |
| next->insertObject("Kids", std::move(kids_list)); |
| result.push_back(PageTreeNode{std::move(next), parent, descendantCount}); |
| } |
| return result; |
| } |
| }; |
| std::vector<PageTreeNode> currentLayer; |
| currentLayer.reserve(pages.size()); |
| SkASSERT(pages.size() == pageRefs.size()); |
| for (size_t i = 0; i < pages.size(); ++i) { |
| currentLayer.push_back(PageTreeNode{std::move(pages[i]), pageRefs[i], 1}); |
| } |
| currentLayer = PageTreeNode::Layer(std::move(currentLayer), doc); |
| while (currentLayer.size() > 1) { |
| currentLayer = PageTreeNode::Layer(std::move(currentLayer), doc); |
| } |
| SkASSERT(currentLayer.size() == 1); |
| const PageTreeNode& root = currentLayer[0]; |
| return doc->emit(*root.fNode, root.fReservedRef); |
| } |
| |
| template<typename T, typename... Args> |
| static void reset_object(T* dst, Args&&... args) { |
| dst->~T(); |
| new (dst) T(std::forward<Args>(args)...); |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| SkPDFDocument::SkPDFDocument(SkWStream* stream, |
| SkPDF::Metadata metadata) |
| : SkDocument(stream) |
| , fMetadata(std::move(metadata)) { |
| constexpr float kDpiForRasterScaleOne = 72.0f; |
| if (fMetadata.fRasterDPI != kDpiForRasterScaleOne) { |
| fInverseRasterScale = kDpiForRasterScaleOne / fMetadata.fRasterDPI; |
| fRasterScale = fMetadata.fRasterDPI / kDpiForRasterScaleOne; |
| } |
| if (fMetadata.fStructureElementTreeRoot) { |
| fTagTree.init(fMetadata.fStructureElementTreeRoot); |
| } |
| fExecutor = fMetadata.fExecutor; |
| } |
| |
| SkPDFDocument::~SkPDFDocument() { |
| // subclasses of SkDocument must call close() in their destructors. |
| this->close(); |
| } |
| |
| SkPDFIndirectReference SkPDFDocument::emit(const SkPDFObject& object, SkPDFIndirectReference ref){ |
| SkAutoMutexExclusive lock(fMutex); |
| object.emitObject(this->beginObject(ref)); |
| this->endObject(); |
| return ref; |
| } |
| |
| SkWStream* SkPDFDocument::beginObject(SkPDFIndirectReference ref) SK_REQUIRES(fMutex) { |
| begin_indirect_object(&fOffsetMap, ref, this->getStream()); |
| return this->getStream(); |
| } |
| |
| void SkPDFDocument::endObject() SK_REQUIRES(fMutex) { |
| end_indirect_object(this->getStream()); |
| } |
| |
| static SkSize operator*(SkISize u, SkScalar s) { return SkSize{u.width() * s, u.height() * s}; } |
| static SkSize operator*(SkSize u, SkScalar s) { return SkSize{u.width() * s, u.height() * s}; } |
| |
| SkCanvas* SkPDFDocument::onBeginPage(SkScalar width, SkScalar height) { |
| SkASSERT(fCanvas.imageInfo().dimensions().isZero()); |
| if (fPages.empty()) { |
| // if this is the first page if the document. |
| { |
| SkAutoMutexExclusive autoMutexAcquire(fMutex); |
| serializeHeader(&fOffsetMap, this->getStream()); |
| |
| } |
| |
| fInfoDict = this->emit(*SkPDFMetadata::MakeDocumentInformationDict(fMetadata)); |
| if (fMetadata.fPDFA) { |
| fUUID = SkPDFMetadata::CreateUUID(fMetadata); |
| // We use the same UUID for Document ID and Instance ID since this |
| // is the first revision of this document (and Skia does not |
| // support revising existing PDF documents). |
| // If we are not in PDF/A mode, don't use a UUID since testing |
| // works best with reproducible outputs. |
| fXMP = SkPDFMetadata::MakeXMPObject(fMetadata, fUUID, fUUID, this); |
| } |
| } |
| // By scaling the page at the device level, we will create bitmap layer |
| // devices at the rasterized scale, not the 72dpi scale. Bitmap layer |
| // devices are created when saveLayer is called with an ImageFilter; see |
| // SkPDFDevice::onCreateDevice(). |
| SkISize pageSize = (SkSize{width, height} * fRasterScale).toRound(); |
| SkMatrix initialTransform; |
| // Skia uses the top left as the origin but PDF natively has the origin at the |
| // bottom left. This matrix corrects for that, as well as the raster scale. |
| initialTransform.setScaleTranslate(fInverseRasterScale, -fInverseRasterScale, |
| 0, fInverseRasterScale * pageSize.height()); |
| fPageDevice = sk_make_sp<SkPDFDevice>(pageSize, this, initialTransform); |
| reset_object(&fCanvas, fPageDevice); |
| fCanvas.scale(fRasterScale, fRasterScale); |
| fPageRefs.push_back(this->reserveRef()); |
| return &fCanvas; |
| } |
| |
| static void populate_link_annotation(SkPDFDict* annotation, const SkRect& r) { |
| annotation->insertName("Subtype", "Link"); |
| annotation->insertInt("F", 4); // required by ISO 19005 |
| // Border: 0 = Horizontal corner radius. |
| // 0 = Vertical corner radius. |
| // 0 = Width, 0 = no border. |
| annotation->insertObject("Border", SkPDFMakeArray(0, 0, 0)); |
| annotation->insertObject("Rect", SkPDFMakeArray(r.fLeft, r.fTop, r.fRight, r.fBottom)); |
| } |
| |
| static SkPDFIndirectReference append_destinations( |
| SkPDFDocument* doc, |
| const std::vector<SkPDFNamedDestination>& namedDestinations) |
| { |
| SkPDFDict destinations; |
| for (const SkPDFNamedDestination& dest : namedDestinations) { |
| auto pdfDest = SkPDFMakeArray(); |
| pdfDest->reserve(5); |
| pdfDest->appendRef(dest.fPage); |
| pdfDest->appendName("XYZ"); |
| pdfDest->appendScalar(dest.fPoint.x()); |
| pdfDest->appendScalar(dest.fPoint.y()); |
| pdfDest->appendInt(0); // Leave zoom unchanged |
| destinations.insertObject(ToValidUtf8String(*dest.fName), std::move(pdfDest)); |
| } |
| return doc->emit(destinations); |
| } |
| |
| std::unique_ptr<SkPDFArray> SkPDFDocument::getAnnotations() { |
| std::unique_ptr<SkPDFArray> array; |
| size_t count = fCurrentPageLinks.size(); |
| if (0 == count) { |
| return array; // is nullptr |
| } |
| array = SkPDFMakeArray(); |
| array->reserve(count); |
| for (const auto& link : fCurrentPageLinks) { |
| SkPDFDict annotation("Annot"); |
| populate_link_annotation(&annotation, link->fRect); |
| if (link->fType == SkPDFLink::Type::kUrl) { |
| std::unique_ptr<SkPDFDict> action = SkPDFMakeDict("Action"); |
| action->insertName("S", "URI"); |
| // This is documented to be a 7 bit ASCII (byte) string. |
| action->insertByteString("URI", ToValidUtf8String(*link->fData)); |
| annotation.insertObject("A", std::move(action)); |
| } else if (link->fType == SkPDFLink::Type::kNamedDestination) { |
| annotation.insertName("Dest", ToValidUtf8String(*link->fData)); |
| } else { |
| SkDEBUGFAIL("Unknown link type."); |
| } |
| |
| if (link->fNodeId) { |
| int structParentKey = createStructParentKeyForNodeId(link->fNodeId); |
| if (structParentKey != -1) { |
| annotation.insertInt("StructParent", structParentKey); |
| } |
| } |
| |
| SkPDFIndirectReference annotationRef = emit(annotation); |
| array->appendRef(annotationRef); |
| if (link->fNodeId) { |
| fTagTree.addNodeAnnotation(link->fNodeId, annotationRef, SkToUInt(this->currentPageIndex())); |
| } |
| } |
| return array; |
| } |
| |
| void SkPDFDocument::onEndPage() { |
| SkASSERT(!fCanvas.imageInfo().dimensions().isZero()); |
| reset_object(&fCanvas); |
| SkASSERT(fPageDevice); |
| |
| auto page = SkPDFMakeDict("Page"); |
| |
| SkSize mediaSize = fPageDevice->imageInfo().dimensions() * fInverseRasterScale; |
| std::unique_ptr<SkStreamAsset> pageContent = fPageDevice->content(); |
| auto resourceDict = fPageDevice->makeResourceDict(); |
| SkASSERT(fPageRefs.size() > 0); |
| fPageDevice = nullptr; |
| |
| page->insertObject("Resources", std::move(resourceDict)); |
| page->insertObject("MediaBox", SkPDFUtils::RectToArray(SkRect::MakeSize(mediaSize))); |
| |
| if (std::unique_ptr<SkPDFArray> annotations = getAnnotations()) { |
| page->insertObject("Annots", std::move(annotations)); |
| fCurrentPageLinks.clear(); |
| } |
| |
| page->insertRef("Contents", SkPDFStreamOut(nullptr, std::move(pageContent), this)); |
| // The StructParents unique identifier for each page is just its |
| // 0-based page index. |
| page->insertInt("StructParents", SkToInt(this->currentPageIndex())); |
| fPages.emplace_back(std::move(page)); |
| } |
| |
| void SkPDFDocument::onAbort() { |
| this->waitForJobs(); |
| } |
| |
| static sk_sp<SkData> SkSrgbIcm() { |
| // Source: http://www.argyllcms.com/icclibsrc.html |
| static const char kProfile[] = |
| "\0\0\14\214argl\2 \0\0mntrRGB XYZ \7\336\0\1\0\6\0\26\0\17\0:acspM" |
| "SFT\0\0\0\0IEC sRGB\0\0\0\0\0\0\0\0\0\0\0\0\0\0\366\326\0\1\0\0\0\0" |
| "\323-argl\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0" |
| "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\21desc\0\0\1P\0\0\0\231cprt\0" |
| "\0\1\354\0\0\0gdmnd\0\0\2T\0\0\0pdmdd\0\0\2\304\0\0\0\210tech\0\0\3" |
| "L\0\0\0\14vued\0\0\3X\0\0\0gview\0\0\3\300\0\0\0$lumi\0\0\3\344\0\0" |
| "\0\24meas\0\0\3\370\0\0\0$wtpt\0\0\4\34\0\0\0\24bkpt\0\0\0040\0\0\0" |
| "\24rXYZ\0\0\4D\0\0\0\24gXYZ\0\0\4X\0\0\0\24bXYZ\0\0\4l\0\0\0\24rTR" |
| "C\0\0\4\200\0\0\10\14gTRC\0\0\4\200\0\0\10\14bTRC\0\0\4\200\0\0\10" |
| "\14desc\0\0\0\0\0\0\0?sRGB IEC61966-2.1 (Equivalent to www.srgb.co" |
| "m 1998 HP profile)\0\0\0\0\0\0\0\0\0\0\0?sRGB IEC61966-2.1 (Equiva" |
| "lent to www.srgb.com 1998 HP profile)\0\0\0\0\0\0\0\0text\0\0\0\0C" |
| "reated by Graeme W. Gill. Released into the public domain. No Warr" |
| "anty, Use at your own risk.\0\0desc\0\0\0\0\0\0\0\26IEC http://www" |
| ".iec.ch\0\0\0\0\0\0\0\0\0\0\0\26IEC http://www.iec.ch\0\0\0\0\0\0\0" |
| "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0" |
| "\0\0\0\0\0\0desc\0\0\0\0\0\0\0.IEC 61966-2.1 Default RGB colour sp" |
| "ace - sRGB\0\0\0\0\0\0\0\0\0\0\0.IEC 61966-2.1 Default RGB colour " |
| "space - sRGB\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0sig \0\0\0" |
| "\0CRT desc\0\0\0\0\0\0\0\rIEC61966-2.1\0\0\0\0\0\0\0\0\0\0\0\rIEC6" |
| "1966-2.1\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0" |
| "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0view\0\0\0\0" |
| "\0\23\244|\0\24_0\0\20\316\2\0\3\355\262\0\4\23\n\0\3\\g\0\0\0\1XY" |
| "Z \0\0\0\0\0L\n=\0P\0\0\0W\36\270meas\0\0\0\0\0\0\0\1\0\0\0\0\0\0\0" |
| "\0\0\0\0\0\0\0\0\0\0\0\2\217\0\0\0\2XYZ \0\0\0\0\0\0\363Q\0\1\0\0\0" |
| "\1\26\314XYZ \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0XYZ \0\0\0\0\0\0o\240" |
| "\0\0008\365\0\0\3\220XYZ \0\0\0\0\0\0b\227\0\0\267\207\0\0\30\331X" |
| "YZ \0\0\0\0\0\0$\237\0\0\17\204\0\0\266\304curv\0\0\0\0\0\0\4\0\0\0" |
| "\0\5\0\n\0\17\0\24\0\31\0\36\0#\0(\0-\0002\0007\0;\0@\0E\0J\0O\0T\0" |
| "Y\0^\0c\0h\0m\0r\0w\0|\0\201\0\206\0\213\0\220\0\225\0\232\0\237\0" |
| "\244\0\251\0\256\0\262\0\267\0\274\0\301\0\306\0\313\0\320\0\325\0" |
| "\333\0\340\0\345\0\353\0\360\0\366\0\373\1\1\1\7\1\r\1\23\1\31\1\37" |
| "\1%\1+\0012\0018\1>\1E\1L\1R\1Y\1`\1g\1n\1u\1|\1\203\1\213\1\222\1" |
| "\232\1\241\1\251\1\261\1\271\1\301\1\311\1\321\1\331\1\341\1\351\1" |
| "\362\1\372\2\3\2\14\2\24\2\35\2&\2/\0028\2A\2K\2T\2]\2g\2q\2z\2\204" |
| "\2\216\2\230\2\242\2\254\2\266\2\301\2\313\2\325\2\340\2\353\2\365" |
| "\3\0\3\13\3\26\3!\3-\0038\3C\3O\3Z\3f\3r\3~\3\212\3\226\3\242\3\256" |
| "\3\272\3\307\3\323\3\340\3\354\3\371\4\6\4\23\4 \4-\4;\4H\4U\4c\4q" |
| "\4~\4\214\4\232\4\250\4\266\4\304\4\323\4\341\4\360\4\376\5\r\5\34" |
| "\5+\5:\5I\5X\5g\5w\5\206\5\226\5\246\5\265\5\305\5\325\5\345\5\366" |
| "\6\6\6\26\6'\0067\6H\6Y\6j\6{\6\214\6\235\6\257\6\300\6\321\6\343\6" |
| "\365\7\7\7\31\7+\7=\7O\7a\7t\7\206\7\231\7\254\7\277\7\322\7\345\7" |
| "\370\10\13\10\37\0102\10F\10Z\10n\10\202\10\226\10\252\10\276\10\322" |
| "\10\347\10\373\t\20\t%\t:\tO\td\ty\t\217\t\244\t\272\t\317\t\345\t" |
| "\373\n\21\n'\n=\nT\nj\n\201\n\230\n\256\n\305\n\334\n\363\13\13\13" |
| "\"\0139\13Q\13i\13\200\13\230\13\260\13\310\13\341\13\371\14\22\14" |
| "*\14C\14\\\14u\14\216\14\247\14\300\14\331\14\363\r\r\r&\r@\rZ\rt\r" |
| "\216\r\251\r\303\r\336\r\370\16\23\16.\16I\16d\16\177\16\233\16\266" |
| "\16\322\16\356\17\t\17%\17A\17^\17z\17\226\17\263\17\317\17\354\20" |
| "\t\20&\20C\20a\20~\20\233\20\271\20\327\20\365\21\23\0211\21O\21m\21" |
| "\214\21\252\21\311\21\350\22\7\22&\22E\22d\22\204\22\243\22\303\22" |
| "\343\23\3\23#\23C\23c\23\203\23\244\23\305\23\345\24\6\24'\24I\24j" |
| "\24\213\24\255\24\316\24\360\25\22\0254\25V\25x\25\233\25\275\25\340" |
| "\26\3\26&\26I\26l\26\217\26\262\26\326\26\372\27\35\27A\27e\27\211" |
| "\27\256\27\322\27\367\30\33\30@\30e\30\212\30\257\30\325\30\372\31" |
| " \31E\31k\31\221\31\267\31\335\32\4\32*\32Q\32w\32\236\32\305\32\354" |
| "\33\24\33;\33c\33\212\33\262\33\332\34\2\34*\34R\34{\34\243\34\314" |
| "\34\365\35\36\35G\35p\35\231\35\303\35\354\36\26\36@\36j\36\224\36" |
| "\276\36\351\37\23\37>\37i\37\224\37\277\37\352 \25 A l \230 \304 \360" |
| "!\34!H!u!\241!\316!\373\"'\"U\"\202\"\257\"\335#\n#8#f#\224#\302#\360" |
| "$\37$M$|$\253$\332%\t%8%h%\227%\307%\367&'&W&\207&\267&\350'\30'I'" |
| "z'\253'\334(\r(?(q(\242(\324)\6)8)k)\235)\320*\2*5*h*\233*\317+\2+" |
| "6+i+\235+\321,\5,9,n,\242,\327-\14-A-v-\253-\341.\26.L.\202.\267.\356" |
| "/$/Z/\221/\307/\376050l0\2440\3331\0221J1\2021\2721\3622*2c2\2332\324" |
| "3\r3F3\1773\2703\3614+4e4\2364\3305\0235M5\2075\3025\375676r6\2566" |
| "\3517$7`7\2347\3278\0248P8\2148\3109\0059B9\1779\2749\371:6:t:\262" |
| ":\357;-;k;\252;\350<'<e<\244<\343=\"=a=\241=\340> >`>\240>\340?!?a" |
| "?\242?\342@#@d@\246@\347A)AjA\254A\356B0BrB\265B\367C:C}C\300D\3DG" |
| "D\212D\316E\22EUE\232E\336F\"FgF\253F\360G5G{G\300H\5HKH\221H\327I" |
| "\35IcI\251I\360J7J}J\304K\14KSK\232K\342L*LrL\272M\2MJM\223M\334N%" |
| "NnN\267O\0OIO\223O\335P'PqP\273Q\6QPQ\233Q\346R1R|R\307S\23S_S\252" |
| "S\366TBT\217T\333U(UuU\302V\17V\\V\251V\367WDW\222W\340X/X}X\313Y\32" |
| "YiY\270Z\7ZVZ\246Z\365[E[\225[\345\\5\\\206\\\326]']x]\311^\32^l^\275" |
| "_\17_a_\263`\5`W`\252`\374aOa\242a\365bIb\234b\360cCc\227c\353d@d\224" |
| "d\351e=e\222e\347f=f\222f\350g=g\223g\351h?h\226h\354iCi\232i\361j" |
| "Hj\237j\367kOk\247k\377lWl\257m\10m`m\271n\22nkn\304o\36oxo\321p+p" |
| "\206p\340q:q\225q\360rKr\246s\1s]s\270t\24tpt\314u(u\205u\341v>v\233" |
| "v\370wVw\263x\21xnx\314y*y\211y\347zFz\245{\4{c{\302|!|\201|\341}A" |
| "}\241~\1~b~\302\177#\177\204\177\345\200G\200\250\201\n\201k\201\315" |
| "\2020\202\222\202\364\203W\203\272\204\35\204\200\204\343\205G\205" |
| "\253\206\16\206r\206\327\207;\207\237\210\4\210i\210\316\2113\211\231" |
| "\211\376\212d\212\312\2130\213\226\213\374\214c\214\312\2151\215\230" |
| "\215\377\216f\216\316\2176\217\236\220\6\220n\220\326\221?\221\250" |
| "\222\21\222z\222\343\223M\223\266\224 \224\212\224\364\225_\225\311" |
| "\2264\226\237\227\n\227u\227\340\230L\230\270\231$\231\220\231\374" |
| "\232h\232\325\233B\233\257\234\34\234\211\234\367\235d\235\322\236" |
| "@\236\256\237\35\237\213\237\372\240i\240\330\241G\241\266\242&\242" |
| "\226\243\6\243v\243\346\244V\244\307\2458\245\251\246\32\246\213\246" |
| "\375\247n\247\340\250R\250\304\2517\251\251\252\34\252\217\253\2\253" |
| "u\253\351\254\\\254\320\255D\255\270\256-\256\241\257\26\257\213\260" |
| "\0\260u\260\352\261`\261\326\262K\262\302\2638\263\256\264%\264\234" |
| "\265\23\265\212\266\1\266y\266\360\267h\267\340\270Y\270\321\271J\271" |
| "\302\272;\272\265\273.\273\247\274!\274\233\275\25\275\217\276\n\276" |
| "\204\276\377\277z\277\365\300p\300\354\301g\301\343\302_\302\333\303" |
| "X\303\324\304Q\304\316\305K\305\310\306F\306\303\307A\307\277\310=" |
| "\310\274\311:\311\271\3128\312\267\3136\313\266\3145\314\265\3155\315" |
| "\265\3166\316\266\3177\317\270\3209\320\272\321<\321\276\322?\322\301" |
| "\323D\323\306\324I\324\313\325N\325\321\326U\326\330\327\\\327\340" |
| "\330d\330\350\331l\331\361\332v\332\373\333\200\334\5\334\212\335\20" |
| "\335\226\336\34\336\242\337)\337\257\3406\340\275\341D\341\314\342" |
| "S\342\333\343c\343\353\344s\344\374\345\204\346\r\346\226\347\37\347" |
| "\251\3502\350\274\351F\351\320\352[\352\345\353p\353\373\354\206\355" |
| "\21\355\234\356(\356\264\357@\357\314\360X\360\345\361r\361\377\362" |
| "\214\363\31\363\247\3644\364\302\365P\365\336\366m\366\373\367\212" |
| "\370\31\370\250\3718\371\307\372W\372\347\373w\374\7\374\230\375)\375" |
| "\272\376K\376\334\377m\377\377"; |
| const size_t kProfileLength = 3212; |
| static_assert(kProfileLength == sizeof(kProfile) - 1, ""); |
| return SkData::MakeWithoutCopy(kProfile, kProfileLength); |
| } |
| |
| static SkPDFIndirectReference make_srgb_color_profile(SkPDFDocument* doc) { |
| std::unique_ptr<SkPDFDict> dict = SkPDFMakeDict(); |
| dict->insertInt("N", 3); |
| dict->insertObject("Range", SkPDFMakeArray(0, 1, 0, 1, 0, 1)); |
| return SkPDFStreamOut(std::move(dict), SkMemoryStream::Make(SkSrgbIcm()), |
| doc, SkPDFSteamCompressionEnabled::Yes); |
| } |
| |
| static std::unique_ptr<SkPDFArray> make_srgb_output_intents(SkPDFDocument* doc) { |
| // sRGB is specified by HTML, CSS, and SVG. |
| auto outputIntent = SkPDFMakeDict("OutputIntent"); |
| outputIntent->insertName("S", "GTS_PDFA1"); |
| outputIntent->insertTextString("RegistryName", "http://www.color.org"); |
| outputIntent->insertTextString("OutputConditionIdentifier", "Custom"); |
| outputIntent->insertTextString("Info", "sRGB IEC61966-2.1"); |
| outputIntent->insertRef("DestOutputProfile", make_srgb_color_profile(doc)); |
| auto intentArray = SkPDFMakeArray(); |
| intentArray->appendObject(std::move(outputIntent)); |
| return intentArray; |
| } |
| |
| SkPDFIndirectReference SkPDFDocument::getPage(size_t pageIndex) const { |
| SkASSERT(pageIndex < fPageRefs.size()); |
| return fPageRefs[pageIndex]; |
| } |
| |
| const SkMatrix& SkPDFDocument::currentPageTransform() const { |
| return fPageDevice->initialTransform(); |
| } |
| |
| int SkPDFDocument::createMarkIdForNodeId(int nodeId) { |
| return fTagTree.createMarkIdForNodeId(nodeId, SkToUInt(this->currentPageIndex())); |
| } |
| |
| int SkPDFDocument::createStructParentKeyForNodeId(int nodeId) { |
| return fTagTree.createStructParentKeyForNodeId(nodeId, SkToUInt(this->currentPageIndex())); |
| } |
| |
| static std::vector<const SkPDFFont*> get_fonts(const SkPDFDocument& canon) { |
| std::vector<const SkPDFFont*> fonts; |
| fonts.reserve(canon.fFontMap.count()); |
| // Sort so the output PDF is reproducible. |
| for (const auto& [unused, font] : canon.fFontMap) { |
| fonts.push_back(&font); |
| } |
| std::sort(fonts.begin(), fonts.end(), [](const SkPDFFont* u, const SkPDFFont* v) { |
| return u->indirectReference().fValue < v->indirectReference().fValue; |
| }); |
| return fonts; |
| } |
| |
| SkString SkPDFDocument::nextFontSubsetTag() { |
| // PDF 32000-1:2008 Section 9.6.4 FontSubsets "The tag shall consist of six uppercase letters" |
| // "followed by a plus sign" "different subsets in the same PDF file shall have different tags." |
| // There are 26^6 or 308,915,776 possible values. So start in range then increment and mod. |
| uint32_t thisFontSubsetTag = fNextFontSubsetTag; |
| fNextFontSubsetTag = (fNextFontSubsetTag + 1u) % 308915776u; |
| |
| SkString subsetTag(7); |
| char* subsetTagData = subsetTag.data(); |
| for (size_t i = 0; i < 6; ++i) { |
| subsetTagData[i] = 'A' + (thisFontSubsetTag % 26); |
| thisFontSubsetTag /= 26; |
| } |
| subsetTagData[6] = '+'; |
| return subsetTag; |
| } |
| |
| void SkPDFDocument::onClose(SkWStream* stream) { |
| SkASSERT(fCanvas.imageInfo().dimensions().isZero()); |
| if (fPages.empty()) { |
| this->waitForJobs(); |
| return; |
| } |
| auto docCatalog = SkPDFMakeDict("Catalog"); |
| if (fMetadata.fPDFA) { |
| SkASSERT(fXMP != SkPDFIndirectReference()); |
| docCatalog->insertRef("Metadata", fXMP); |
| // Don't specify OutputIntents if we are not in PDF/A mode since |
| // no one has ever asked for this feature. |
| docCatalog->insertObject("OutputIntents", make_srgb_output_intents(this)); |
| } |
| |
| docCatalog->insertRef("Pages", generate_page_tree(this, std::move(fPages), fPageRefs)); |
| |
| if (!fNamedDestinations.empty()) { |
| docCatalog->insertRef("Dests", append_destinations(this, fNamedDestinations)); |
| fNamedDestinations.clear(); |
| } |
| |
| // Handle tagged PDFs. |
| if (SkPDFIndirectReference root = fTagTree.makeStructTreeRoot(this)) { |
| // In the document catalog, indicate that this PDF is tagged. |
| auto markInfo = SkPDFMakeDict("MarkInfo"); |
| markInfo->insertBool("Marked", true); |
| docCatalog->insertObject("MarkInfo", std::move(markInfo)); |
| docCatalog->insertRef("StructTreeRoot", root); |
| } |
| |
| auto docCatalogRef = this->emit(*docCatalog); |
| |
| for (const SkPDFFont* f : get_fonts(*this)) { |
| f->emitSubset(this); |
| } |
| |
| this->waitForJobs(); |
| { |
| SkAutoMutexExclusive autoMutexAcquire(fMutex); |
| serialize_footer(fOffsetMap, this->getStream(), fInfoDict, docCatalogRef, fUUID); |
| } |
| } |
| |
| void SkPDFDocument::incrementJobCount() { fJobCount++; } |
| |
| void SkPDFDocument::signalJobComplete() { fSemaphore.signal(); } |
| |
| void SkPDFDocument::waitForJobs() { |
| // fJobCount can increase while we wait. |
| while (fJobCount > 0) { |
| fSemaphore.wait(); |
| --fJobCount; |
| } |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| void SkPDF::SetNodeId(SkCanvas* canvas, int nodeID) { |
| sk_sp<SkData> payload = SkData::MakeWithCopy(&nodeID, sizeof(nodeID)); |
| const char* key = SkPDFGetNodeIdKey(); |
| canvas->drawAnnotation({0, 0, 0, 0}, key, payload.get()); |
| } |
| |
| sk_sp<SkDocument> SkPDF::MakeDocument(SkWStream* stream, const SkPDF::Metadata& metadata) { |
| SkPDF::Metadata meta = metadata; |
| if (meta.fRasterDPI <= 0) { |
| meta.fRasterDPI = 72.0f; |
| } |
| if (meta.fEncodingQuality < 0) { |
| meta.fEncodingQuality = 0; |
| } |
| return stream ? sk_make_sp<SkPDFDocument>(stream, std::move(meta)) : nullptr; |
| } |