| /************************************************************** |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * |
| *************************************************************/ |
| |
| |
| |
| #ifndef SD_SLIDESORTER_CACHE_COMPACTOR_HXX |
| #define SD_SLIDESORTER_CACHE_COMPACTOR_HXX |
| |
| #include <sal/types.h> |
| #include <vcl/timer.hxx> |
| #include <memory> |
| |
| namespace sd { namespace slidesorter { namespace cache { |
| |
| class BitmapCache; |
| class BitmapCompressor; |
| |
| /** This is an interface class whose implementations are created via the |
| Create() factory method. |
| */ |
| class CacheCompactor |
| { |
| public: |
| virtual ~CacheCompactor (void) {}; |
| |
| /** Create a new instance of the CacheCompactor interface class. The |
| type of compaction algorithm used depends on values from the |
| configuration: the SlideSorter/PreviewCache/CompactionPolicy |
| property of the Impress.xcs file currently supports the values |
| "None" and "Compress". With the later the CompressionPolicy |
| property is evaluated which implementation of the BitmapCompress |
| interface class to use as bitmap compressor. |
| @param rCache |
| The bitmap cache on which to operate. |
| @param nMaximalCacheSize |
| The total number of bytes the off-screen bitmaps in the cache |
| may have. When the Run() method is (indirectly) called the |
| compactor tries to reduce that summed size of off-screen bitmaps |
| under this number. However, it is not guaranteed that this |
| works in all cases. |
| */ |
| static ::std::auto_ptr<CacheCompactor> Create ( |
| BitmapCache& rCache, |
| sal_Int32 nMaximalCacheSize); |
| |
| /** Request a compaction of the off-screen previews in the bitmap |
| cache. This calls via a timer the Run() method. |
| */ |
| virtual void RequestCompaction (void); |
| |
| protected: |
| BitmapCache& mrCache; |
| sal_Int32 mnMaximalCacheSize; |
| |
| CacheCompactor( |
| BitmapCache& rCache, |
| sal_Int32 nMaximalCacheSize); |
| |
| /** This method actually tries to reduce the total number of bytes used |
| by the off-screen preview bitmaps. |
| */ |
| virtual void Run (void) = 0; |
| |
| private: |
| /** This timer is used to collect calles to RequestCompaction() and |
| eventually call Run(). |
| */ |
| Timer maCompactionTimer; |
| bool mbIsCompactionRunning; |
| DECL_LINK(CompactionCallback, Timer*); |
| }; |
| |
| |
| |
| |
| } } } // end of namespace ::sd::slidesorter::cache |
| |
| #endif |