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Further optimization: code moved into constructor thereby eliminating need for getLevelSize() function.

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Ruven 2023-04-25 12:06:27 +02:00
parent 5fd125dc92
commit c5404006b2
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GPG Key ID: B54C2EF1C087BEFB
1 changed files with 21 additions and 42 deletions
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63
src/iiiftilesource.js
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@ -141,6 +141,18 @@ $.IIIFTileSource = function( options ){
} }
} }
// Create an array with our exact resolution sizes if these have been supplied
if( this.sizes ) {
var sizeLength = this.sizes.length;
if ( (sizeLength === options.maxLevel) || (sizeLength === options.maxLevel + 1) ) {
this.levelSizes = this.sizes;
// Need to take into account that the list may or may not include the full resolution size
if( sizeLength === options.maxLevel ) {
this.levelSizes.push( {width: this.width, height: this.height} );
}
}
}
$.TileSource.apply( this, [ options ] ); $.TileSource.apply( this, [ options ] );
}; };
@ -334,8 +346,8 @@ $.extend( $.IIIFTileSource.prototype, $.TileSource.prototype, /** @lends OpenSea
} }
// Use supplied list of scaled resolution sizes if these exist // Use supplied list of scaled resolution sizes if these exist
var levelSize = this.getLevelSize(level); if( this.levelSizes ) {
if( levelSize ) { var levelSize = this.levelSizes[level];
var x = Math.ceil( levelSize.width / this.getTileWidth(level) ), var x = Math.ceil( levelSize.width / this.getTileWidth(level) ),
y = Math.ceil( levelSize.height / this.getTileHeight(level) ); y = Math.ceil( levelSize.height / this.getTileHeight(level) );
return new $.Point( x, y ); return new $.Point( x, y );
@ -347,37 +359,6 @@ $.extend( $.IIIFTileSource.prototype, $.TileSource.prototype, /** @lends OpenSea
}, },
/**
* Determine image size at a given resolution level using the info.json "sizes" field
* Returns null if this information is not present
* @function {Number} level
*/
getLevelSize: function( level ) {
if (!this.sizes) {
return null;
}
var levelWidth, levelHeight;
var numLevels = this.maxLevel - this.minLevel;
var sizeLength = this.sizes.length;
// Need to take into account that the list may or may not include the full resolution size
if (sizeLength === numLevels) {
levelWidth = (level === sizeLength) ? this.width : this.sizes[level].width;
levelHeight = (level === sizeLength) ? this.height : this.sizes[level].height;
} else if ( sizeLength === numLevels + 1 ) {
levelWidth = this.sizes[level].width;
levelHeight = this.sizes[level].height;
} else {
// Sizes field doesn't contain resolution level sizes, so discard
return null;
}
return {width: levelWidth, height: levelHeight};
},
/** /**
* @function * @function
* @param {Number} level * @param {Number} level
@ -390,14 +371,13 @@ $.extend( $.IIIFTileSource.prototype, $.TileSource.prototype, /** @lends OpenSea
} }
// Use supplied list of scaled resolution sizes if these exist // Use supplied list of scaled resolution sizes if these exist
var levelSize = this.getLevelSize(level); if( this.levelSizes ) {
if( levelSize ) {
var validPoint = point.x >= 0 && point.x <= 1 && var validPoint = point.x >= 0 && point.x <= 1 &&
point.y >= 0 && point.y <= 1 / this.aspectRatio; point.y >= 0 && point.y <= 1 / this.aspectRatio;
$.console.assert(validPoint, "[TileSource.getTileAtPoint] must be called with a valid point."); $.console.assert(validPoint, "[TileSource.getTileAtPoint] must be called with a valid point.");
var widthScaled = levelSize.width; var widthScaled = this.levelSizes[level].width;
var pixelX = point.x * widthScaled; var pixelX = point.x * widthScaled;
var pixelY = point.y * widthScaled; var pixelY = point.y * widthScaled;
@ -466,15 +446,14 @@ $.extend( $.IIIFTileSource.prototype, $.TileSource.prototype, /** @lends OpenSea
uri; uri;
// Use supplied list of scaled resolution sizes if these exist // Use supplied list of scaled resolution sizes if these exist
var levelSize = this.getLevelSize( level ); if( this.levelSizes ) {
if( levelSize ) { levelWidth = this.levelSizes[level].width;
levelWidth = levelSize.width; levelHeight = this.levelSizes[level].height;
levelHeight = levelSize.height;
} }
// Otherwise calculate the sizes ourselves // Otherwise calculate the sizes ourselves
else { else {
levelWidth = Math.ceil( this.width * scale ); levelWidth = Math.ceil( this.width * scale );
levelHeight = Math.ceil( this.height * scale ); levelHeight = Math.ceil( this.height * scale );
} }
tileWidth = this.getTileWidth(level); tileWidth = this.getTileWidth(level);