mirror of https://github.com/axmolengine/axmol.git
99 lines
4.0 KiB
C
99 lines
4.0 KiB
C
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/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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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(const SkRefPtr<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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private:
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// Multiple pages may reference the content.
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SkRefPtr<SkPDFDevice> fDevice;
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SkString fContent;
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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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