| /* |
| * 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 "SkPDFDocument.h" |
| |
| #include "SkCanvas.h" |
| #include "SkMakeUnique.h" |
| #include "SkPDFCanon.h" |
| #include "SkPDFDevice.h" |
| #include "SkPDFUtils.h" |
| #include "SkStream.h" |
| |
| SkPDFObjectSerializer::SkPDFObjectSerializer() : fBaseOffset(0), fNextToBeSerialized(0) {} |
| |
| template <class T> static void renew(T* t) { t->~T(); new (t) T; } |
| |
| SkPDFObjectSerializer::~SkPDFObjectSerializer() { |
| for (int i = 0; i < fObjNumMap.objects().count(); ++i) { |
| fObjNumMap.objects()[i]->drop(); |
| } |
| } |
| |
| void SkPDFObjectSerializer::addObjectRecursively(const sk_sp<SkPDFObject>& object) { |
| fObjNumMap.addObjectRecursively(object.get()); |
| } |
| |
| #define SKPDF_MAGIC "\xD3\xEB\xE9\xE1" |
| #ifndef SK_BUILD_FOR_WIN32 |
| 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 |
| void SkPDFObjectSerializer::serializeHeader(SkWStream* wStream, |
| const SkDocument::PDFMetadata& md) { |
| fBaseOffset = wStream->bytesWritten(); |
| static const char kHeader[] = "%PDF-1.4\n%" SKPDF_MAGIC "\n"; |
| wStream->write(kHeader, strlen(kHeader)); |
| // 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. |
| fInfoDict = SkPDFMetadata::MakeDocumentInformationDict(md); |
| this->addObjectRecursively(fInfoDict); |
| this->serializeObjects(wStream); |
| } |
| #undef SKPDF_MAGIC |
| |
| // Serialize all objects in the fObjNumMap that have not yet been serialized; |
| void SkPDFObjectSerializer::serializeObjects(SkWStream* wStream) { |
| const SkTArray<sk_sp<SkPDFObject>>& objects = fObjNumMap.objects(); |
| while (fNextToBeSerialized < objects.count()) { |
| SkPDFObject* object = objects[fNextToBeSerialized].get(); |
| int32_t index = fNextToBeSerialized + 1; // Skip object 0. |
| // "The first entry in the [XREF] table (object number 0) is |
| // always free and has a generation number of 65,535; it is |
| // the head of the linked list of free objects." |
| SkASSERT(fOffsets.count() == fNextToBeSerialized); |
| fOffsets.push(this->offset(wStream)); |
| wStream->writeDecAsText(index); |
| wStream->writeText(" 0 obj\n"); // Generation number is always 0. |
| object->emitObject(wStream, fObjNumMap); |
| wStream->writeText("\nendobj\n"); |
| object->drop(); |
| ++fNextToBeSerialized; |
| } |
| } |
| |
| // Xref table and footer |
| void SkPDFObjectSerializer::serializeFooter(SkWStream* wStream, |
| const sk_sp<SkPDFObject> docCatalog, |
| sk_sp<SkPDFObject> id) { |
| this->serializeObjects(wStream); |
| int32_t xRefFileOffset = this->offset(wStream); |
| // Include the special zeroth object in the count. |
| int32_t objCount = SkToS32(fOffsets.count() + 1); |
| wStream->writeText("xref\n0 "); |
| wStream->writeDecAsText(objCount); |
| wStream->writeText("\n0000000000 65535 f \n"); |
| for (int i = 0; i < fOffsets.count(); i++) { |
| wStream->writeBigDecAsText(fOffsets[i], 10); |
| wStream->writeText(" 00000 n \n"); |
| } |
| SkPDFDict trailerDict; |
| trailerDict.insertInt("Size", objCount); |
| SkASSERT(docCatalog); |
| trailerDict.insertObjRef("Root", docCatalog); |
| SkASSERT(fInfoDict); |
| trailerDict.insertObjRef("Info", std::move(fInfoDict)); |
| if (id) { |
| trailerDict.insertObject("ID", std::move(id)); |
| } |
| wStream->writeText("trailer\n"); |
| trailerDict.emitObject(wStream, fObjNumMap); |
| wStream->writeText("\nstartxref\n"); |
| wStream->writeBigDecAsText(xRefFileOffset); |
| wStream->writeText("\n%%EOF"); |
| } |
| |
| int32_t SkPDFObjectSerializer::offset(SkWStream* wStream) { |
| size_t offset = wStream->bytesWritten(); |
| SkASSERT(offset > fBaseOffset); |
| return SkToS32(offset - fBaseOffset); |
| } |
| |
| |
| // return root node. |
| static sk_sp<SkPDFDict> generate_page_tree(SkTArray<sk_sp<SkPDFDict>>* pages) { |
| // 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. |
| static const int kNodeSize = 8; |
| |
| // curNodes takes a reference to its items, which it passes to pageTree. |
| int totalPageCount = pages->count(); |
| SkTArray<sk_sp<SkPDFDict>> curNodes; |
| curNodes.swap(pages); |
| |
| // nextRoundNodes passes its references to nodes on to curNodes. |
| int treeCapacity = kNodeSize; |
| do { |
| SkTArray<sk_sp<SkPDFDict>> nextRoundNodes; |
| for (int i = 0; i < curNodes.count(); ) { |
| if (i > 0 && i + 1 == curNodes.count()) { |
| SkASSERT(curNodes[i]); |
| nextRoundNodes.emplace_back(std::move(curNodes[i])); |
| break; |
| } |
| |
| auto newNode = sk_make_sp<SkPDFDict>("Pages"); |
| auto kids = sk_make_sp<SkPDFArray>(); |
| kids->reserve(kNodeSize); |
| |
| int count = 0; |
| for (; i < curNodes.count() && count < kNodeSize; i++, count++) { |
| SkASSERT(curNodes[i]); |
| curNodes[i]->insertObjRef("Parent", newNode); |
| kids->appendObjRef(std::move(curNodes[i])); |
| } |
| |
| // treeCapacity is the number of leaf nodes possible for the |
| // current set of subtrees being generated. (i.e. 8, 64, 512, ...). |
| // It is hard to count the number of leaf nodes in the current |
| // subtree. However, by construction, we know that unless it's the |
| // last subtree for the current depth, the leaf count will be |
| // treeCapacity, otherwise it's what ever is left over after |
| // consuming treeCapacity chunks. |
| int pageCount = treeCapacity; |
| if (i == curNodes.count()) { |
| pageCount = ((totalPageCount - 1) % treeCapacity) + 1; |
| } |
| newNode->insertInt("Count", pageCount); |
| newNode->insertObject("Kids", std::move(kids)); |
| nextRoundNodes.emplace_back(std::move(newNode)); |
| } |
| SkDEBUGCODE( for (const auto& n : curNodes) { SkASSERT(!n); } ); |
| |
| curNodes.swap(&nextRoundNodes); |
| nextRoundNodes.reset(); |
| treeCapacity *= kNodeSize; |
| } while (curNodes.count() > 1); |
| return std::move(curNodes[0]); |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| SkPDFDocument::SkPDFDocument(SkWStream* stream, |
| void (*doneProc)(SkWStream*, bool), |
| SkScalar rasterDpi, |
| const SkDocument::PDFMetadata& metadata, |
| sk_sp<SkPixelSerializer> jpegEncoder, |
| bool pdfa) |
| : SkDocument(stream, doneProc) |
| , fRasterDpi(rasterDpi) |
| , fMetadata(metadata) |
| , fPDFA(pdfa) { |
| fCanon.fPixelSerializer = std::move(jpegEncoder); |
| } |
| |
| SkPDFDocument::~SkPDFDocument() { |
| // subclasses of SkDocument must call close() in their destructors. |
| this->close(); |
| } |
| |
| void SkPDFDocument::serialize(const sk_sp<SkPDFObject>& object) { |
| fObjectSerializer.addObjectRecursively(object); |
| fObjectSerializer.serializeObjects(this->getStream()); |
| } |
| |
| SkCanvas* SkPDFDocument::onBeginPage(SkScalar width, SkScalar height) { |
| SkASSERT(!fCanvas.get()); // endPage() was called before this. |
| if (fPages.empty()) { |
| // if this is the first page if the document. |
| fObjectSerializer.serializeHeader(this->getStream(), fMetadata); |
| fDests = sk_make_sp<SkPDFDict>(); |
| if (fPDFA) { |
| SkPDFMetadata::UUID uuid = 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. |
| fID = SkPDFMetadata::MakePdfId(uuid, uuid); |
| fXMP = SkPDFMetadata::MakeXMPObject(fMetadata, uuid, uuid); |
| fObjectSerializer.addObjectRecursively(fXMP); |
| fObjectSerializer.serializeObjects(this->getStream()); |
| } |
| } |
| SkISize pageSize = SkISize::Make( |
| SkScalarRoundToInt(width), SkScalarRoundToInt(height)); |
| fPageDevice = sk_make_sp<SkPDFDevice>(pageSize, this); |
| fPageDevice->setFlip(); // Only the top-level device needs to be flipped. |
| fCanvas.reset(new SkCanvas(fPageDevice.get())); |
| return fCanvas.get(); |
| } |
| |
| void SkPDFDocument::onEndPage() { |
| SkASSERT(fCanvas.get()); |
| fCanvas->flush(); |
| fCanvas.reset(nullptr); |
| SkASSERT(fPageDevice); |
| auto page = sk_make_sp<SkPDFDict>("Page"); |
| page->insertObject("Resources", fPageDevice->makeResourceDict()); |
| page->insertObject("MediaBox", fPageDevice->copyMediaBox()); |
| auto annotations = sk_make_sp<SkPDFArray>(); |
| fPageDevice->appendAnnotations(annotations.get()); |
| if (annotations->size() > 0) { |
| page->insertObject("Annots", std::move(annotations)); |
| } |
| auto contentObject = sk_make_sp<SkPDFStream>(fPageDevice->content()); |
| this->serialize(contentObject); |
| page->insertObjRef("Contents", std::move(contentObject)); |
| fPageDevice->appendDestinations(fDests.get(), page.get()); |
| fPages.emplace_back(std::move(page)); |
| fPageDevice.reset(nullptr); |
| } |
| |
| void SkPDFDocument::onAbort() { |
| this->reset(); |
| } |
| |
| void SkPDFDocument::reset() { |
| fCanvas.reset(nullptr); |
| fPages.reset(); |
| renew(&fCanon); |
| renew(&fObjectSerializer); |
| fFonts.reset(); |
| } |
| |
| 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" |
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| "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" |
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| "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" |
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| "@\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 sk_sp<SkPDFStream> make_srgb_color_profile() { |
| sk_sp<SkPDFStream> stream = sk_make_sp<SkPDFStream>(SkSrgbIcm()); |
| stream->dict()->insertInt("N", 3); |
| sk_sp<SkPDFArray> array = sk_make_sp<SkPDFArray>(); |
| array->appendScalar(0.0f); |
| array->appendScalar(1.0f); |
| array->appendScalar(0.0f); |
| array->appendScalar(1.0f); |
| array->appendScalar(0.0f); |
| array->appendScalar(1.0f); |
| stream->dict()->insertObject("Range", std::move(array)); |
| return stream; |
| } |
| |
| static sk_sp<SkPDFArray> make_srgb_output_intents() { |
| // sRGB is specified by HTML, CSS, and SVG. |
| auto outputIntent = sk_make_sp<SkPDFDict>("OutputIntent"); |
| outputIntent->insertName("S", "GTS_PDFA1"); |
| outputIntent->insertString("RegistryName", "http://www.color.org"); |
| outputIntent->insertString("OutputConditionIdentifier", |
| "Custom"); |
| outputIntent->insertString("Info","sRGB IEC61966-2.1"); |
| outputIntent->insertObjRef("DestOutputProfile", |
| make_srgb_color_profile()); |
| auto intentArray = sk_make_sp<SkPDFArray>(); |
| intentArray->appendObject(std::move(outputIntent)); |
| return intentArray; |
| } |
| |
| void SkPDFDocument::onClose(SkWStream* stream) { |
| SkASSERT(!fCanvas.get()); |
| if (fPages.empty()) { |
| this->reset(); |
| return; |
| } |
| auto docCatalog = sk_make_sp<SkPDFDict>("Catalog"); |
| if (fPDFA) { |
| SkASSERT(fXMP); |
| docCatalog->insertObjRef("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()); |
| } |
| SkASSERT(!fPages.empty()); |
| docCatalog->insertObjRef("Pages", generate_page_tree(&fPages)); |
| SkASSERT(fPages.empty()); |
| |
| if (fDests->size() > 0) { |
| docCatalog->insertObjRef("Dests", std::move(fDests)); |
| } |
| |
| // Build font subsetting info before calling addObjectRecursively(). |
| SkPDFCanon* canon = &fCanon; |
| fFonts.foreach([canon](SkPDFFont* p){ p->getFontSubset(canon); }); |
| fObjectSerializer.addObjectRecursively(docCatalog); |
| fObjectSerializer.serializeObjects(this->getStream()); |
| fObjectSerializer.serializeFooter(this->getStream(), docCatalog, fID); |
| this->reset(); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| sk_sp<SkDocument> SkPDFMakeDocument(SkWStream* stream, |
| void (*proc)(SkWStream*, bool), |
| SkScalar dpi, |
| const SkDocument::PDFMetadata& metadata, |
| sk_sp<SkPixelSerializer> jpeg, |
| bool pdfa) { |
| if (dpi <= 0) { |
| dpi = 72.0f; |
| } |
| return stream ? sk_make_sp<SkPDFDocument>(stream, proc, dpi, metadata, |
| std::move(jpeg), pdfa) |
| : nullptr; |
| } |
| |
| sk_sp<SkDocument> SkDocument::MakePDF(const char path[], SkScalar dpi) { |
| auto delete_wstream = [](SkWStream* stream, bool) { delete stream; }; |
| auto stream = skstd::make_unique<SkFILEWStream>(path); |
| return stream->isValid() |
| ? SkPDFMakeDocument(stream.release(), delete_wstream, dpi, |
| SkDocument::PDFMetadata(), nullptr, |
| false) |
| : nullptr; |
| } |
| |
| sk_sp<SkDocument> SkDocument::MakePDF(SkWStream* stream, |
| SkScalar dpi, |
| const SkDocument::PDFMetadata& metadata, |
| sk_sp<SkPixelSerializer> jpegEncoder, |
| bool pdfa) { |
| return SkPDFMakeDocument(stream, nullptr, dpi, metadata, |
| std::move(jpegEncoder), pdfa); |
| } |