// Copyright 2018 Google LLC. // Use of this source code is governed by a BSD-style license that can be found in the LICENSE file. #ifndef SkPDFDocument_DEFINED #define SkPDFDocument_DEFINED #include "SkDocument.h" #include "SkScalar.h" #include "SkString.h" #include "SkTime.h" class SkExecutor; namespace SkPDF { /** Table 333 in PDF 32000-1:2008 ยง14.8.4.2 */ enum class DocumentStructureType { kDocument, //!< Document kPart, //!< Part kArt, //!< Article kSect, //!< Section kDiv, //!< Division kBlockQuote, //!< Block quotation kCaption, //!< Caption kTOC, //!< Table of Contents kTOCI, //!< Table of Contents Item kIndex, //!< Index kNonStruct, //!< Nonstructural element kPrivate, //!< Private element kH, //!< Heading kH1, //!< Heading level 1 kH2, //!< Heading level 2 kH3, //!< Heading level 3 kH4, //!< Heading level 4 kH5, //!< Heading level 5 kH6, //!< Heading level 6 kP, //!< Paragraph kL, //!< List kLI, //!< List item kLbl, //!< List item label kLBody, //!< List item body kTable, //!< Table kTR, //!< Table row kTH, //!< Table header cell kTD, //!< Table data cell kTHead, //!< Table header row group kTBody, //!< Table body row group kTFoot, //!< table footer row group kSpan, //!< Span kQuote, //!< Quotation kNote, //!< Note kReference, //!< Reference kBibEntry, //!< Bibliography entry kCode, //!< Code kLink, //!< Link kAnnot, //!< Annotation kRuby, //!< Ruby annotation kRB, //!< Ruby base text kRT, //!< Ruby annotation text kRP, //!< Ruby punctuation kWarichu, //!< Warichu annotation kWT, //!< Warichu text kWP, //!< Warichu punctuation kFigure, //!< Figure kFormula, //!< Formula kForm, //!< Form control (not like an HTML FORM element) }; /** A node in a PDF structure tree, giving a semantic representation of the content. Each node ID is associated with content by passing the SkCanvas and node ID to SkPDF::SetNodeId() when drawing. NodeIDs should be unique within each tree. */ struct StructureElementNode { const StructureElementNode* fChildren = nullptr; size_t fChildCount; int fNodeId; DocumentStructureType fType; }; /** Optional metadata to be passed into the PDF factory function. */ struct Metadata { /** The document's title. */ SkString fTitle; /** The name of the person who created the document. */ SkString fAuthor; /** The subject of the document. */ SkString fSubject; /** Keywords associated with the document. Commas may be used to delineate keywords within the string. */ SkString fKeywords; /** If the document was converted to PDF from another format, the name of the conforming product that created the original document from which it was converted. */ SkString fCreator; /** The product that is converting this document to PDF. Leave fProducer empty to get the default, correct value. */ SkString fProducer; /** The date and time the document was created. The zero default value represents an unknown/unset time. */ SkTime::DateTime fCreation = {0, 0, 0, 0, 0, 0, 0, 0}; /** The date and time the document was most recently modified. The zero default value represents an unknown/unset time. */ SkTime::DateTime fModified = {0, 0, 0, 0, 0, 0, 0, 0}; /** The DPI (pixels-per-inch) at which features without native PDF support will be rasterized (e.g. draw image with perspective, draw text with perspective, ...) A larger DPI would create a PDF that reflects the original intent with better fidelity, but it can make for larger PDF files too, which would use more memory while rendering, and it would be slower to be processed or sent online or to printer. */ SkScalar fRasterDPI = SK_ScalarDefaultRasterDPI; /** If true, include XMP metadata, a document UUID, and sRGB output intent information. This adds length to the document and makes it non-reproducable, but are necessary features for PDF/A-2b conformance */ bool fPDFA = false; /** Encoding quality controls the trade-off between size and quality. By default this is set to 101 percent, which corresponds to lossless encoding. If this value is set to a value <= 100, and the image is opaque, it will be encoded (using JPEG) with that quality setting. */ int fEncodingQuality = 101; /** An optional tree of structured document tags that provide a semantic representation of the content. The caller should retain ownership. */ const StructureElementNode* fStructureElementTreeRoot = nullptr; /** Executor to handle threaded work within PDF Backend. If this is nullptr, then all work will be done serially on the main thread. To have worker threads assist with various tasks, set this to a valid SkExecutor instance. Currently used for executing Deflate algorithm in parallel. If set, the PDF output will be non-reproducible in the order and internal numbering of objects, but should render the same. Experimental. */ SkExecutor* fExecutor = nullptr; }; /** Associate a node ID with subsequent drawing commands in an SkCanvas. The same node ID can appear in a StructureElementNode in order to associate a document's structure element tree with its content. A node ID of zero indicates no node ID. @param canvas The canvas used to draw to the PDF. @param nodeId The node ID for subsequent drawing commands. */ SK_API void SetNodeId(SkCanvas* dst, int nodeID); /** Create a PDF-backed document, writing the results into a SkWStream. PDF pages are sized in point units. 1 pt == 1/72 inch == 127/360 mm. @param stream A PDF document will be written to this stream. The document may write to the stream at anytime during its lifetime, until either close() is called or the document is deleted. @param metadata a PDFmetadata object. Any fields may be left empty. @returns NULL if there is an error, otherwise a newly created PDF-backed SkDocument. */ SK_API sk_sp MakeDocument(SkWStream* stream, const Metadata& metadata); static inline sk_sp MakeDocument(SkWStream* stream) { return MakeDocument(stream, Metadata()); } } // namespace SkPDF #endif // SkPDFDocument_DEFINED