/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ /* * This file is part of the LibreOffice project. * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. * * This file incorporates work covered by the following license notice: * * 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 . */ #pragma once #include #include #include class SdrPage; namespace sd::slidesorter::cache { class CacheCompactor; class BitmapCompressor; /** This low level cache is the actual bitmap container. It supports a precious flag for every preview bitmap and keeps track of total sizes for all previews with/without this flag. The precious flag is used by compaction algorithms to determine which previews may be compressed or even discarded and which have to remain in their original form. The precious flag is usually set for the visible previews. Additionally to the actual preview there is an optional marked preview. This is used for slides excluded from the slide show which have a preview that shows a mark (some sort of bitmap overlay) to that effect. */ class BitmapCache { public: /** The key for looking up preview bitmaps is a pointer to an SdrPage object. The prior use of PageObjectViewObjectContact objects (which ultimately use them) turned out to be less suitable because their life time is shorter then that of the page objects. Frequent destruction and re-creation of the preview bitmaps was the result. */ typedef const SdrPage* CacheKey; class CacheEntry; class CacheBitmapContainer; typedef ::std::vector CacheIndex; /** Create a new cache for bitmap objects. The default value from the configuration is used. When that does not exist then an internal default value is used. */ explicit BitmapCache(); /** The destructor clears the cache and releases all bitmaps still in it. */ ~BitmapCache(); /** Remove all preview bitmaps from the cache. After this call the cache is empty. */ void Clear(); /** Return when the cache is full, i.e. the cache compactor had to be run. */ bool IsFull() const { return mbIsFull; } /** Return the memory size that is occupied by all non-precious bitmaps in the cache. */ sal_Int32 GetSize() const { return mnNormalCacheSize; } /** Return when a preview bitmap exists for the given key. */ bool HasBitmap(const CacheKey& rKey); /** Return when a preview bitmap exists for the given key and when it is up-to-date. */ bool BitmapIsUpToDate(const CacheKey& rKey); /** Return the preview bitmap for the given contact object. */ BitmapEx GetBitmap(const CacheKey& rKey); /** Return the marked preview bitmap for the given contact object. */ BitmapEx GetMarkedBitmap(const CacheKey& rKey); /** Release the reference to the preview bitmap that is associated with the given key. */ void ReleaseBitmap(const CacheKey& rKey); /** Mark the specified preview bitmap as not being up-to-date anymore. @return When the key references a page in the cache then return . When the key is not known then is returned. */ bool InvalidateBitmap(const CacheKey& rKey); /** Mark all preview bitmaps as not being up-to-date anymore. */ void InvalidateCache(); /** Add or replace a bitmap for the given key. */ void SetBitmap(const CacheKey& rKey, const BitmapEx& rPreview, bool bIsPrecious); /** Add or replace a marked bitmap for the given key. */ void SetMarkedBitmap(const CacheKey& rKey, const BitmapEx& rPreview); /** Mark the specified preview bitmap as precious, i.e. that it must not be compressed or otherwise removed from the cache. */ void SetPrecious(const CacheKey& rKey, bool bIsPrecious); /** Calculate the cache size. This should rarely be necessary because the cache size is tracked with each modification of preview bitmaps. */ void ReCalculateTotalCacheSize(); /** Use the previews in the given cache to initialize missing previews. */ void Recycle(const BitmapCache& rCache); /** Return a list of sorted cache keys that represent an index into (a part of) the cache. The entries of the index are sorted according to last access times with the least recently access time first. Entries with the precious flag set are omitted. Entries with that have no preview bitmaps are omitted. */ CacheIndex GetCacheIndex() const; /** Compress the specified preview bitmap with the given bitmap compressor. A reference to the compressor is stored for later decompression. */ void Compress(const CacheKey& rKey, const std::shared_ptr& rpCompressor); private: mutable ::osl::Mutex maMutex; std::unique_ptr mpBitmapContainer; /** Total size of bytes that are occupied by bitmaps in the cache for whom the slides are currently not inside the visible area. */ sal_Int32 mnNormalCacheSize; /** Total size of bytes that are occupied by bitmaps in the cache for whom the slides are currently visible. */ sal_Int32 mnPreciousCacheSize; /** At the moment the access time is not an actual time or date value but a counter that is increased with every access. It thus defines the same ordering as a true time. */ sal_Int32 mnCurrentAccessTime; /** The maximal cache size for the off-screen preview bitmaps. When mnNormalCacheSize grows larger than this value then the mpCacheCompactor member is used to reduce the cache size. */ sal_Int32 mnMaximalNormalCacheSize; /** The cache compactor is used to reduce the number of bytes used by off-screen preview bitmaps. */ ::std::unique_ptr mpCacheCompactor; /** This flag stores if the cache is or recently was full, i.e. the cache compactor has or had to be run in order to reduce the cache size to the allowed value. */ bool mbIsFull; /** Update mnNormalCacheSize or mnPreciousCacheSize according to the precious flag of the specified preview bitmap and the specified operation. */ enum CacheOperation { ADD, REMOVE }; void UpdateCacheSize(const CacheEntry& rKey, CacheOperation eOperation); }; } // end of namespace ::sd::slidesorter::cache /* vim:set shiftwidth=4 softtabstop=4 expandtab: */