vandebo@chromium.org | 8459d4e | 2010-09-24 22:25:30 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2010 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #ifndef SkPDFCatalog_DEFINED |
| 18 | #define SkPDFCatalog_DEFINED |
| 19 | |
| 20 | #include "SkPDFTypes.h" |
| 21 | #include "SkRefCnt.h" |
| 22 | #include "SkTDArray.h" |
| 23 | |
| 24 | /** \class SkPDFCatalog |
| 25 | |
| 26 | The PDF catalog object manages object numbers and when emitted to the |
| 27 | PDF stream, indexes all the objects in the file by offset. |
| 28 | */ |
| 29 | class SkPDFCatalog { |
| 30 | public: |
| 31 | /** Create a PDF catalog. |
| 32 | */ |
| 33 | SkPDFCatalog() |
| 34 | : fNextObjNum(1), |
| 35 | fStartedAssigningObjNums(false), |
| 36 | fAssigningFirstPageObjNums(false) { |
| 37 | } |
| 38 | virtual ~SkPDFCatalog() {} |
| 39 | |
| 40 | /** Add the passed object to the catalog. |
| 41 | * @param obj The object to add. |
| 42 | * @param onFirstPage Is the object on the first page. |
| 43 | */ |
| 44 | void addObject(SkPDFObject* obj, bool onFirstPage); |
| 45 | |
| 46 | /** Output the object number for the passed object. |
| 47 | * @param obj The object of interest. |
| 48 | * @param stream The writable output stream to send the output to. |
| 49 | */ |
| 50 | void emitObjectNumber(SkWStream* stream, SkPDFObject* obj); |
| 51 | |
| 52 | /** Return the number of bytes that would be emitted for the passed |
| 53 | * object's object number. |
| 54 | * @param obj The object of interest |
| 55 | */ |
| 56 | size_t getObjectNumberSize(SkPDFObject* obj); |
| 57 | |
| 58 | private: |
| 59 | struct Rec { |
| 60 | Rec(SkPDFObject* object, bool onFirstPage) |
| 61 | : fObject(object), |
| 62 | fFileOffset(0), |
| 63 | fObjNumAssigned(false), |
| 64 | fOnFirstPage(onFirstPage) { |
| 65 | } |
| 66 | SkPDFObject* fObject; |
| 67 | off_t fFileOffset; |
| 68 | bool fObjNumAssigned; |
| 69 | bool fOnFirstPage; |
| 70 | }; |
| 71 | |
| 72 | // TODO(vandebo) Make this a hash if it's a performance problem. |
| 73 | SkTDArray<struct Rec> fCatalog; |
| 74 | |
| 75 | uint32_t fNextObjNum; |
| 76 | bool fStartedAssigningObjNums; |
| 77 | bool fAssigningFirstPageObjNums; |
| 78 | |
| 79 | int findObjectIndex(SkPDFObject* obj) const; |
| 80 | |
| 81 | int assignObjNum(SkPDFObject* obj); |
| 82 | }; |
| 83 | |
| 84 | #endif |