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/**
* Library that handles the bulk optimization processes.
*
* @requires jQuery
*/
window.imagify = window.imagify || {};
/* eslint-disable no-underscore-dangle, consistent-this */
(function($, d, w) {
/**
* Construct the optimizer.
*
* @param {object} settings {
* Optimizer settings:
*
* @type {string} groupID Group ID, like 'library' or 'custom-folders'.
* @type {string} context Context within this group, like 'wp' or 'custom-folders' (yes, again).
* @type {int} level Optimization level: 0 to 2.
* @type {int} bufferSize Number of parallel optimizations: usually 4.
* @type {string} ajaxUrl URL to request to optimize.
* @type {object} files Files to optimize: media ID as key (prefixed with an underscore), file URL as value.
* @type {string} defaultThumb A default thumbnail URL.
* @type {string} doneEvent Name of the event to listen to know when optimizations end.
* @type {array} imageExtensions A list of supported image extensions (only images).
* }
*/
w.imagify.Optimizer = function ( settings ) {
// Settings.
this.groupID = settings.groupID;
this.context = settings.context;
this.level = settings.level;
this.bufferSize = settings.bufferSize || 1;
this.ajaxUrl = settings.ajaxUrl;
this.files = settings.files;
this.defaultThumb = settings.defaultThumb;
this.doneEvent = settings.doneEvent;
if ( settings.imageExtensions ) {
this.imageExtensions = settings.imageExtensions;
} else {
this.imageExtensions = [ 'jpg', 'jpeg', 'jpe', 'png', 'gif' ];
}
/**
* An array of media IDs (prefixed with an underscore).
*/
this.prefixedMediaIDs = Object.keys( this.files );
/**
* An array of medias currently being optimized: {
* @type {int} mediaID The media ID.
* @type {string} filename The file name.
* @type {string} thumbnail The file thumbnail URL.
* }
*/
this.currentItems = [];
// Internal counters.
this.totalMedia = this.prefixedMediaIDs.length;
this.processedMedia = 0;
// Global stats.
this.globalOriginalSize = 0;
this.globalOptimizedSize = 0;
this.globalGain = 0;
this.globalPercent = 0;
// Callbacks.
this._before = function () {};
this._each = function () {};
this._done = function () {};
// Listen to the "optimization done" event.
if ( this.totalMedia && this.doneEvent ) {
$( w ).on( this.doneEvent, { _this: this }, this.processedCallback );
}
};
/**
* Callback to trigger before each media optimization.
*
* @param {callable} fnc A callback.
* @return this
*/
w.imagify.Optimizer.prototype.before = function( fnc ) {
this._before = fnc;
return this;
};
/**
* Callback to trigger after each media optimization.
*
* @param {callable} fnc A callback.
* @return this
*/
w.imagify.Optimizer.prototype.each = function( fnc ) {
this._each = fnc;
return this;
};
/**
* Callback to trigger all media optimizations have been done.
*
* @param {callable} fnc A callback.
* @return this
*/
w.imagify.Optimizer.prototype.done = function( fnc ) {
this._done = fnc;
return this;
};
/**
* Launch optimizations.
*
* @return this
*/
w.imagify.Optimizer.prototype.run = function() {
var chunkLength = this.prefixedMediaIDs.length > this.bufferSize ? this.bufferSize : this.prefixedMediaIDs.length,
i;
for ( i = 0; i < chunkLength; i++ ) {
this.processNext();
}
return this;
};
/**
* Launch next optimization.
*
* @return this
*/
w.imagify.Optimizer.prototype.processNext = function() {
if ( this.prefixedMediaIDs.length ) {
this.process( this.prefixedMediaIDs.shift() );
}
return this;
};
/**
* Launch an optimization.
*
* @param {string} prefixedId A media ID, prefixed with an underscore.
* @return this
*/
w.imagify.Optimizer.prototype.process = function( prefixedId ) {
var _this = this,
fileURL = this.files[ prefixedId ],
data = {
mediaID: parseInt( prefixedId.toString().substr( 1 ), 10 ),
filename: this.files[ prefixedId ].split( '/' ).pop(),
thumbnail: this.defaultThumb
},
extension = data.filename.split( '.' ).pop().toLowerCase(),
regexp = new RegExp( '^' + this.imageExtensions.join( '|' ).toLowerCase() + '$' ),
image;
if ( ! extension.match( regexp ) ) {
// Not an image.
this.currentItems.push( data );
this._before( data );
this.send( data );
return this;
}
// Create a thumbnail and send the ajax request.
image = new Image();
image.onerror = function () {
_this.currentItems.push( data );
_this._before( data );
_this.send( data );
};
image.onload = function () {
var maxWidth = 33,
maxHeight = 33,
imageWidth = image.width,
imageHeight = image.height,
newHeight = 0,
newWidth = 0,
topOffset = 0,
leftOffset = 0,
canvas = null,
ctx = null;
if ( imageWidth < imageHeight ) {
// Portrait.
newWidth = maxWidth;
newHeight = newWidth * imageHeight / imageWidth;
topOffset = ( maxHeight - newHeight ) / 2;
} else {
// Landscape.
newHeight = maxHeight;
newWidth = newHeight * imageWidth / imageHeight;
leftOffset = ( maxWidth - newWidth ) / 2;
}
canvas = d.createElement( 'canvas' );
canvas.width = maxWidth;
canvas.height = maxHeight;
ctx = canvas.getContext( '2d' );
ctx.drawImage( this, leftOffset, topOffset, newWidth, newHeight );
try {
data.thumbnail = canvas.toDataURL( 'image/jpeg' );
} catch ( e ) {
data.thumbnail = _this.defaultThumb;
}
canvas = null;
ctx = null;
image = null;
_this.currentItems.push( data );
_this._before( data );
_this.send( data );
};
image.src = fileURL;
return this;
};
/**
* Do the ajax request.
*
* @param {object} data {
* The data:
*
* @type {int} mediaID The media ID.
* @type {string} filename The file name.
* @type {string} thumbnail The file thumbnail URL.
* }
* @return this
*/
w.imagify.Optimizer.prototype.send = function( data ) {
var _this = this,
defaultResponse = {
success: false,
mediaID: data.mediaID,
groupID: this.groupID,
context: this.context,
filename: data.filename,
thumbnail: data.thumbnail,
status: 'error',
error: ''
};
$.post( {
url: this.ajaxUrl,
data: {
media_id: data.mediaID,
context: this.context,
optimization_level: this.level
},
dataType: 'json'
} )
.done( function( response ) {
if ( response.success ) {
return;
}
defaultResponse.error = response.data.error;
_this.processed( defaultResponse );
} )
.fail( function( jqXHR ) {
if ( 200 === jqXHR.status ) {
defaultResponse.error = jqXHR.responseText.replace( /<h1>.*<\/h1>\n*/, '' );
} else {
defaultResponse.error = jqXHR.statusText;
}
_this.processed( defaultResponse );
} );
return this;
};
/**
* Callback triggered when an optimization is complete.
*
* @param {object} e jQuery's Event object.
* @param {object} item {
* The response:
*
* @type {int} mediaID The media ID.
* @type {string} context The context.
* }
*/
w.imagify.Optimizer.prototype.processedCallback = function( e, item ) {
var _this = e.data._this;
if ( item.context !== _this.context ) {
return;
}
if ( ! item.mediaID || typeof _this.files[ '_' + item.mediaID ] === 'undefined' ) {
return;
}
item.groupID = _this.groupID;
if ( ! _this.currentItems.length ) {
// Trouble.
_this.processed( item );
return;
}
$.each( _this.currentItems, function( i, mediaData ) {
if ( item.mediaID === mediaData.mediaID ) {
item.filename = mediaData.filename;
item.thumbnail = mediaData.thumbnail;
return false;
}
} );
_this.processed( item );
};
/**
* After a media has been processed.
*
* @param {object} response {
* The response:
*
* @type {bool} success Whether the optimization succeeded or not ("already optimized" is a success).
* @type {int} mediaID The media ID.
* @type {string} groupID The group ID.
* @type {string} context The context.
* @type {string} filename The file name.
* @type {string} thumbnail The file thumbnail URL.
* @type {string} status The status, like 'optimized', 'already-optimized', 'over-quota', 'error'.
* @type {string} error The error message.
* }
* @return this
*/
w.imagify.Optimizer.prototype.processed = function( response ) {
var currentItems = this.currentItems;
if ( currentItems.length ) {
// Remove this media from the "current" list.
$.each( currentItems, function( i, mediaData ) {
if ( response.mediaID === mediaData.mediaID ) {
currentItems.splice( i, 1 );
return false;
}
} );
this.currentItems = currentItems;
}
// Update stats.
if ( response.success && 'already-optimized' !== response.status ) {
this.globalOriginalSize += response.originalOverallSize;
this.globalOptimizedSize += response.newOverallSize;
this.globalGain += response.overallSaving;
this.globalPercent = ( 100 - this.globalOptimizedSize / this.globalOptimizedSize * 100 ).toFixed( 2 );
}
++this.processedMedia;
response.progress = Math.floor( this.processedMedia / this.totalMedia * 100 );
this._each( response );
if ( this.prefixedMediaIDs.length ) {
this.processNext();
} else if ( this.totalMedia === this.processedMedia ) {
this._done( {
globalOriginalSize: this.globalOriginalSize,
globalOptimizedSize: this.globalOptimizedSize,
globalGain: this.globalGain
} );
}
return this;
};
/**
* Stop the process.
*
* @return this
*/
w.imagify.Optimizer.prototype.stopProcess = function() {
this.files = {};
this.prefixedMediaIDs = [];
this.currentItems = [];
if ( this.doneEvent ) {
$( w ).off( this.doneEvent, this.processedCallback );
}
return this;
};
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