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Modify the TileSource constructor and _memoizeLevelScale

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This commit is contained in:
Sanghoon Kim 2021-11-30 11:40:06 +09:00
parent de39597c14
commit f8c97143e8
1 changed files with 9 additions and 10 deletions
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17
src/tilesource.js
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@ -219,13 +219,12 @@ $.TileSource = function( width, height, tileSize, tileOverlap, minLevel, maxLeve
this.tileOverlap = options.tileOverlap ? options.tileOverlap : 0;
this.minLevel = options.minLevel ? options.minLevel : 0;
this.setMaxLevel( ( undefined !== options.maxLevel && null !== options.maxLevel ) ?
this.maxLevel = ( undefined !== options.maxLevel && null !== options.maxLevel ) ?
options.maxLevel : (
( options.width && options.height ) ? Math.ceil(
Math.log( Math.max( options.width, options.height ) ) /
Math.log( 2 )
) : 0
)
);
if( this.success && $.isFunction( this.success ) ){
this.success( this );
@ -279,12 +278,10 @@ $.TileSource.prototype = {
/**
* @function
* @param {Number} level
* @return {OpenSeadragon.TileSource} Chainable.
*/
setMaxLevel: function( level ) {
this.maxLevel = level;
this._memoizeLevelScale( level );
return this;
this._memoizeLevelScale();
},
/**
@ -292,19 +289,21 @@ $.TileSource.prototype = {
* @param {Number} level
*/
getLevelScale: function( level ) {
this._memoizeLevelScale( this.maxLevel );
// if getLevelScale is not memoized, we generate the memoized version
// at the first call and return the result
this._memoizeLevelScale();
return this.getLevelScale( level );
},
// private
_memoizeLevelScale: function( level ) {
_memoizeLevelScale: function() {
// see https://github.com/openseadragon/openseadragon/issues/22
// we use the tilesources implementation of getLevelScale to generate
// a memoized re-implementation
var levelScaleCache = {},
i;
for( i = 0; i <= level; i++ ){
levelScaleCache[ i ] = 1 / Math.pow(2, level - i);
for( i = 0; i <= this.maxlevel; i++ ){
levelScaleCache[ i ] = 1 / Math.pow(2, this.maxlevel - i);
}
this.getLevelScale = function( _level ){
return levelScaleCache[ _level ];