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https://github.com/openseadragon/openseadragon.git
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114 lines
3.9 KiB
JavaScript
114 lines
3.9 KiB
JavaScript
/*
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* OpenSeadragon - TileCache
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*
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* Copyright (C) 2009 CodePlex Foundation
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* Copyright (C) 2010-2013 OpenSeadragon contributors
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* - Neither the name of CodePlex Foundation nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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(function( $ ){
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/**
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* @class TileCache
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* @classdesc
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*/
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$.TileCache = function( options ) {
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options = options || {};
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this._tilesLoaded = [];
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this._maxImageCacheCount = options.maxImageCacheCount || $.DEFAULT_SETTINGS.maxImageCacheCount;
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};
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$.TileCache.prototype = /** @lends OpenSeadragon.TileCache.prototype */{
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/**
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* Returns the total number of tiles that have been loaded by this TileCache.
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* @method
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* @returns {Number} - The total number of tiles that have been loaded by
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* this TileCache.
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*/
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numTilesLoaded: function() {
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return this._tilesLoaded.length;
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},
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cacheTile: function( tile, cutoff ) {
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cutoff = cutoff || 0;
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var insertionIndex = this._tilesLoaded.length;
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if ( this._tilesLoaded.length >= this._maxImageCacheCount ) {
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var worstTile = null;
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var worstTileIndex = -1;
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var prevTile, worstTime, worstLevel, prevTime, prevLevel;
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for ( var i = this._tilesLoaded.length - 1; i >= 0; i-- ) {
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prevTile = this._tilesLoaded[ i ];
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if ( prevTile.level <= cutoff || prevTile.beingDrawn ) {
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continue;
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} else if ( !worstTile ) {
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worstTile = prevTile;
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worstTileIndex = i;
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continue;
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}
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prevTime = prevTile.lastTouchTime;
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worstTime = worstTile.lastTouchTime;
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prevLevel = prevTile.level;
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worstLevel = worstTile.level;
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if ( prevTime < worstTime ||
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( prevTime == worstTime && prevLevel > worstLevel ) ) {
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worstTile = prevTile;
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worstTileIndex = i;
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}
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}
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if ( worstTile && worstTileIndex >= 0 ) {
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worstTile.unload();
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insertionIndex = worstTileIndex;
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}
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}
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this._tilesLoaded[ insertionIndex ] = tile;
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},
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/**
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* Clears all tiles.
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* @method
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*/
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reset: function() {
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for ( var i = 0; i < this._tilesLoaded.length; ++i ) {
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this._tilesLoaded[i].unload();
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}
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this._tilesLoaded = [];
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}
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};
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}( OpenSeadragon ));
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