зеркало из https://github.com/mozilla/gecko-dev.git
100 строки
3.8 KiB
C++
100 строки
3.8 KiB
C++
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/*
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* Copyright 2010 The Android Open Source Project
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkPDFPage_DEFINED
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#define SkPDFPage_DEFINED
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#include "SkPDFTypes.h"
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#include "SkPDFStream.h"
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#include "SkRefCnt.h"
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#include "SkTDArray.h"
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class SkPDFCatalog;
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class SkPDFDevice;
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class SkWStream;
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/** \class SkPDFPage
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A SkPDFPage contains meta information about a page, is used in the page
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tree and points to the content of the page.
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*/
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class SkPDFPage : public SkPDFDict {
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public:
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/** Create a PDF page with the passed PDF device. The device need not
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* have content on it yet.
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* @param content The page content.
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*/
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explicit SkPDFPage(SkPDFDevice* content);
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~SkPDFPage();
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/** Before a page and its contents can be sized and emitted, it must
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* be finalized. No changes to the PDFDevice will be honored after
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* finalizePage has been called. This function adds the page content
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* to the passed catalog, so it must be called for each document
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* that the page is part of.
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* @param catalog The catalog to add page content objects to.
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* @param firstPage Indicate if this is the first page of a document.
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* @param resourceObjects The resource objects used on the page are added
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* to this array. This gives the caller a chance
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* to deduplicate resources across pages.
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*/
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void finalizePage(SkPDFCatalog* catalog, bool firstPage,
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SkTDArray<SkPDFObject*>* resourceObjects);
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/** Determine the size of the page content and store to the catalog
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* the offsets of all nonresource-indirect objects that make up the page
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* content. This must be called before emitPage(), but after finalizePage.
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* @param catalog The catalog to add the object offsets to.
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* @param fileOffset The file offset where the page content will be
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* emitted.
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*/
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off_t getPageSize(SkPDFCatalog* catalog, off_t fileOffset);
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/** Output the page content to the passed stream.
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* @param stream The writable output stream to send the content to.
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* @param catalog The active object catalog.
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*/
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void emitPage(SkWStream* stream, SkPDFCatalog* catalog);
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/** Generate a page tree for the passed vector of pages. New objects are
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* added to the catalog. The pageTree vector is populated with all of
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* the 'Pages' dictionaries as well as the 'Page' objects. Page trees
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* have both parent and children links, creating reference cycles, so
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* it must be torn down explicitly. The first page is not added to
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* the pageTree dictionary array so the caller can handle it specially.
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* @param pages The ordered vector of page objects.
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* @param catalog The catalog to add new objects into.
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* @param pageTree An output vector with all of the internal and leaf
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* nodes of the pageTree.
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* @param rootNode An output parameter set to the root node.
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*/
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static void GeneratePageTree(const SkTDArray<SkPDFPage*>& pages,
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SkPDFCatalog* catalog,
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SkTDArray<SkPDFDict*>* pageTree,
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SkPDFDict** rootNode);
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/** Get the fonts used on this page.
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*/
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SK_API const SkTDArray<SkPDFFont*>& getFontResources() const;
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/** Returns a SkPDFGlyphSetMap which represents glyph usage of every font
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* that shows on this page.
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*/
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const SkPDFGlyphSetMap& getFontGlyphUsage() const;
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private:
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// Multiple pages may reference the content.
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SkRefPtr<SkPDFDevice> fDevice;
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// Once the content is finalized, put it into a stream for output.
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SkRefPtr<SkPDFStream> fContentStream;
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};
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#endif
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