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support iiif level 1

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This commit is contained in:
Jon Stroop 2013-12-18 17:34:39 -05:00
parent efaced5446
commit e9c2b502c1
1 changed files with 40 additions and 14 deletions
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54
src/iiif1_1tilesource.js
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@ -45,22 +45,44 @@
*/ */
$.IIIF1_1TileSource = function( options ){ $.IIIF1_1TileSource = function( options ){
$.extend( true, this, options ); $.extend( true, this, options );
if( !(this.height && this.width && this['@id'] ) ){ if( !(this.height && this.width && this['@id'] ) ){
throw new Error('IIIF required parameters not provided.'); throw new Error('IIIF required parameters not provided.');
} }
if ( !(this.tile_width && this.tile_height) ) { if( (this.profile &&
// use the short dimension if there aren't tile sizes provided. this.profile == "http://library.stanford.edu/iiif/image-api/1.1/compliance.html#level0" ) ){
options.tileSize = Math.min(this.height, this.width); // what if not reporting a profile?
} else { throw new Error('IIIF Image API 1.1 compliance level 1 or greater is required.');
}
if (this.tile_width) {
options.tileSize = this.tile_width; options.tileSize = this.tile_width;
} else if (this.tile_height) {
options.tileSize = this.tile_height;
} else {
// use the largest of tile_options that is smaller than the short
// dimension
var short_dim = Math.min(this.height, this.width),
tile_options = [128,256,512,1024],
smaller_tiles = [];
for ( var c = 0; c < tile_options.length; c++ ) {
if ( tile_options[c] <= short_dim ) {
smaller_tiles.push(tile_options[c]);
}
}
options.tileSize = Math.max.apply(null, smaller_tiles);
} }
if (! options.maxLevel ) { if (! options.maxLevel ) {
var mf = -1; var mf = -1
var scfs = this.scale_factors || this.scale_factor; ; var scfs = this.scale_factors || this.scale_factor;
if ( scfs instanceof Array ) { if ( scfs instanceof Array ) {
for ( var i = 0; i < scfs.length; i++ ) { for ( var i = 0; i < scfs.length; i++ ) {
var cf = Number( scfs[i] ); var cf = Number( scfs[i] );
@ -82,13 +104,9 @@ $.extend( $.IIIF1_1TileSource.prototype, $.TileSource.prototype, /** @lends Open
* @param {Object|Array} data * @param {Object|Array} data
* @param {String} optional - url * @param {String} optional - url
*/ */
supports: function( data, url ){ supports: function( data, url ) {
return data.profile && ( return ( data['@context'] &&
"http://library.stanford.edu/iiif/image-api/1.1/compliance.html#level0" == data.profile || data['@context'] == "http://library.stanford.edu/iiif/image-api/1.1/context.json" );
"http://library.stanford.edu/iiif/image-api/1.1/compliance.html#level1" == data.profile ||
"http://library.stanford.edu/iiif/image-api/1.1/compliance.html#level2" == data.profile ||
"http://library.stanford.edu/iiif/image-api/1.1/compliance.html" == data.profile
);
}, },
/** /**
@ -124,6 +142,7 @@ $.extend( $.IIIF1_1TileSource.prototype, $.TileSource.prototype, /** @lends Open
getTileUrl: function( level, x, y ){ getTileUrl: function( level, x, y ){
//# constants //# constants
var IIIF_ROTATION = '0', var IIIF_ROTATION = '0',
IIIF_QUALITY = 'native.jpg', IIIF_QUALITY = 'native.jpg',
@ -153,7 +172,14 @@ $.extend( $.IIIF1_1TileSource.prototype, $.TileSource.prototype, /** @lends Open
iiif_tile_y = y * iiif_tile_size_height; iiif_tile_y = y * iiif_tile_size_height;
iiif_tile_w = Math.min( iiif_tile_size_width, this.width - iiif_tile_x ); iiif_tile_w = Math.min( iiif_tile_size_width, this.width - iiif_tile_x );
iiif_tile_h = Math.min( iiif_tile_size_height, this.height - iiif_tile_y ); iiif_tile_h = Math.min( iiif_tile_size_height, this.height - iiif_tile_y );
iiif_size = Math.ceil(iiif_tile_w * scale) + "," + Math.ceil(iiif_tile_h * scale);
if( (this.profile &&
this.profile == "http://library.stanford.edu/iiif/image-api/1.1/compliance.html#level1" ) ){
iiif_size = Math.ceil(iiif_tile_w * scale) + ",";
} else {
iiif_size = Math.ceil(iiif_tile_w * scale) + "," + Math.ceil(iiif_tile_h * scale);
}
iiif_region = [ iiif_tile_x, iiif_tile_y, iiif_tile_w, iiif_tile_h ].join(','); iiif_region = [ iiif_tile_x, iiif_tile_y, iiif_tile_w, iiif_tile_h ].join(',');
} }
uri = [ this['@id'], iiif_region, iiif_size, IIIF_ROTATION, IIIF_QUALITY ].join('/'); uri = [ this['@id'], iiif_region, iiif_size, IIIF_ROTATION, IIIF_QUALITY ].join('/');