d877fdbb6e
The guts of the implementation will be in SkPDFDevice and below. This is a first implementation of everything above that point. Review URL: http://codereview.appspot.com/2342043 git-svn-id: http://skia.googlecode.com/svn/trunk@602 2bbb7eff-a529-9590-31e7-b0007b416f81
100 lines
3.2 KiB
C++
100 lines
3.2 KiB
C++
/*
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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 SkPDFCatalog_DEFINED
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#define SkPDFCatalog_DEFINED
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#include "SkPDFTypes.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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The PDF catalog manages object numbers and file offsets. It is used
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to create the PDF cross reference table.
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*/
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class SkPDFCatalog {
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public:
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/** Create a PDF catalog.
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*/
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SkPDFCatalog();
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~SkPDFCatalog();
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/** Add the passed object to the catalog.
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* @param obj The object to add.
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* @param onFirstPage Is the object on the first page.
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*/
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void addObject(SkPDFObject* obj, bool onFirstPage);
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/** Inform the catalog of the object's position in the final stream.
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* The object should already have been added to the catalog. Returns
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* the object's size.
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* @param obj The object to add.
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* @param offset The byte offset in the output stream of this object.
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*/
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size_t setFileOffset(SkPDFObject* obj, size_t offset);
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/** Output the object number for the passed object.
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* @param obj The object of interest.
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* @param stream The writable output stream to send the output to.
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*/
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void emitObjectNumber(SkWStream* stream, SkPDFObject* obj);
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/** Return the number of bytes that would be emitted for the passed
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* object's object number.
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* @param obj The object of interest
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*/
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size_t getObjectNumberSize(SkPDFObject* obj);
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/** Output the cross reference table for objects in the catalog.
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* Returns the total number of objects.
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* @param stream The writable output stream to send the output to.
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* @param firstPage If true, include first page objects only, otherwise
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* include all objects not on the first page.
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*/
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int32_t emitXrefTable(SkWStream* stream, bool firstPage);
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private:
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struct Rec {
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Rec(SkPDFObject* object, bool onFirstPage)
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: fObject(object),
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fFileOffset(0),
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fObjNumAssigned(false),
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fOnFirstPage(onFirstPage) {
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}
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SkPDFObject* fObject;
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off_t fFileOffset;
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bool fObjNumAssigned;
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bool fOnFirstPage;
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};
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// TODO(vandebo) Make this a hash if it's a performance problem.
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SkTDArray<struct Rec> fCatalog;
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// Number of objects on the first page.
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uint32_t fFirstPageCount;
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// Next object number to assign (on page > 1).
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uint32_t fNextObjNum;
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// Next object number to assign on the first page.
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uint32_t fNextFirstPageObjNum;
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int findObjectIndex(SkPDFObject* obj) const;
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int assignObjNum(SkPDFObject* obj);
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};
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#endif
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