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325 lines
12 KiB
JavaScript
325 lines
12 KiB
JavaScript
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/*
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* jQuery File Upload Image Preview & Resize Plugin
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* https://github.com/blueimp/jQuery-File-Upload
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*
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* Copyright 2013, Sebastian Tschan
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* https://blueimp.net
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*
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* Licensed under the MIT license:
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* http://www.opensource.org/licenses/MIT
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*/
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/* jshint nomen:false */
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/* global define, require, window, Blob */
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;(function (factory) {
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'use strict';
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if (typeof define === 'function' && define.amd) {
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// Register as an anonymous AMD module:
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define([
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'jquery',
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'load-image',
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'load-image-meta',
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'load-image-exif',
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'canvas-to-blob',
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'./jquery.fileupload-process'
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], factory);
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} else if (typeof exports === 'object') {
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// Node/CommonJS:
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factory(
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require('jquery'),
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require('blueimp-load-image/js/load-image'),
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require('blueimp-load-image/js/load-image-meta'),
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require('blueimp-load-image/js/load-image-exif'),
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require('blueimp-canvas-to-blob'),
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require('./jquery.fileupload-process')
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);
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} else {
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// Browser globals:
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factory(
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window.jQuery,
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window.loadImage
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);
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}
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}(function ($, loadImage) {
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'use strict';
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// Prepend to the default processQueue:
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$.blueimp.fileupload.prototype.options.processQueue.unshift(
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{
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action: 'loadImageMetaData',
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disableImageHead: '@',
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disableExif: '@',
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disableExifThumbnail: '@',
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disableExifSub: '@',
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disableExifGps: '@',
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disabled: '@disableImageMetaDataLoad'
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},
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{
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action: 'loadImage',
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// Use the action as prefix for the "@" options:
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prefix: true,
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fileTypes: '@',
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maxFileSize: '@',
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noRevoke: '@',
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disabled: '@disableImageLoad'
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},
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{
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action: 'resizeImage',
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// Use "image" as prefix for the "@" options:
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prefix: 'image',
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maxWidth: '@',
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maxHeight: '@',
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minWidth: '@',
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minHeight: '@',
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crop: '@',
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orientation: '@',
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forceResize: '@',
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disabled: '@disableImageResize'
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},
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{
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action: 'saveImage',
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quality: '@imageQuality',
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type: '@imageType',
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disabled: '@disableImageResize'
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},
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{
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action: 'saveImageMetaData',
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disabled: '@disableImageMetaDataSave'
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},
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{
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action: 'resizeImage',
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// Use "preview" as prefix for the "@" options:
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prefix: 'preview',
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maxWidth: '@',
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maxHeight: '@',
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minWidth: '@',
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minHeight: '@',
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crop: '@',
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orientation: '@',
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thumbnail: '@',
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canvas: '@',
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disabled: '@disableImagePreview'
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},
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{
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action: 'setImage',
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name: '@imagePreviewName',
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disabled: '@disableImagePreview'
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},
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{
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action: 'deleteImageReferences',
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disabled: '@disableImageReferencesDeletion'
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}
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);
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// The File Upload Resize plugin extends the fileupload widget
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// with image resize functionality:
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$.widget('blueimp.fileupload', $.blueimp.fileupload, {
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options: {
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// The regular expression for the types of images to load:
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// matched against the file type:
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loadImageFileTypes: /^image\/(gif|jpeg|png|svg\+xml)$/,
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// The maximum file size of images to load:
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loadImageMaxFileSize: 10000000, // 10MB
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// The maximum width of resized images:
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imageMaxWidth: 1920,
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// The maximum height of resized images:
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imageMaxHeight: 1080,
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// Defines the image orientation (1-8) or takes the orientation
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// value from Exif data if set to true:
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imageOrientation: false,
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// Define if resized images should be cropped or only scaled:
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imageCrop: false,
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// Disable the resize image functionality by default:
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disableImageResize: true,
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// The maximum width of the preview images:
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previewMaxWidth: 80,
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// The maximum height of the preview images:
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previewMaxHeight: 80,
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// Defines the preview orientation (1-8) or takes the orientation
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// value from Exif data if set to true:
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previewOrientation: true,
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// Create the preview using the Exif data thumbnail:
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previewThumbnail: true,
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// Define if preview images should be cropped or only scaled:
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previewCrop: false,
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// Define if preview images should be resized as canvas elements:
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previewCanvas: true
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},
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processActions: {
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// Loads the image given via data.files and data.index
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// as img element, if the browser supports the File API.
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// Accepts the options fileTypes (regular expression)
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// and maxFileSize (integer) to limit the files to load:
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loadImage: function (data, options) {
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if (options.disabled) {
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return data;
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}
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var that = this,
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file = data.files[data.index],
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dfd = $.Deferred();
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if (($.type(options.maxFileSize) === 'number' &&
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file.size > options.maxFileSize) ||
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(options.fileTypes &&
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!options.fileTypes.test(file.type)) ||
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!loadImage(
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file,
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function (img) {
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if (img.src) {
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data.img = img;
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}
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dfd.resolveWith(that, [data]);
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},
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options
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)) {
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return data;
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}
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return dfd.promise();
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},
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// Resizes the image given as data.canvas or data.img
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// and updates data.canvas or data.img with the resized image.
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// Also stores the resized image as preview property.
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// Accepts the options maxWidth, maxHeight, minWidth,
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// minHeight, canvas and crop:
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resizeImage: function (data, options) {
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if (options.disabled || !(data.canvas || data.img)) {
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return data;
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}
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options = $.extend({canvas: true}, options);
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var that = this,
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dfd = $.Deferred(),
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img = (options.canvas && data.canvas) || data.img,
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resolve = function (newImg) {
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if (newImg && (newImg.width !== img.width ||
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newImg.height !== img.height ||
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options.forceResize)) {
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data[newImg.getContext ? 'canvas' : 'img'] = newImg;
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}
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data.preview = newImg;
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dfd.resolveWith(that, [data]);
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},
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thumbnail;
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if (data.exif) {
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if (options.orientation === true) {
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options.orientation = data.exif.get('Orientation');
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}
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if (options.thumbnail) {
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thumbnail = data.exif.get('Thumbnail');
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if (thumbnail) {
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loadImage(thumbnail, resolve, options);
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return dfd.promise();
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}
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}
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// Prevent orienting the same image twice:
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if (data.orientation) {
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delete options.orientation;
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} else {
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data.orientation = options.orientation;
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}
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}
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if (img) {
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resolve(loadImage.scale(img, options));
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return dfd.promise();
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}
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return data;
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},
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// Saves the processed image given as data.canvas
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// inplace at data.index of data.files:
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saveImage: function (data, options) {
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if (!data.canvas || options.disabled) {
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return data;
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}
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var that = this,
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file = data.files[data.index],
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dfd = $.Deferred();
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if (data.canvas.toBlob) {
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data.canvas.toBlob(
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function (blob) {
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if (!blob.name) {
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if (file.type === blob.type) {
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blob.name = file.name;
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} else if (file.name) {
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blob.name = file.name.replace(
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/\.\w+$/,
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'.' + blob.type.substr(6)
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);
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}
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}
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// Don't restore invalid meta data:
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if (file.type !== blob.type) {
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delete data.imageHead;
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}
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// Store the created blob at the position
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// of the original file in the files list:
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data.files[data.index] = blob;
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dfd.resolveWith(that, [data]);
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},
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options.type || file.type,
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options.quality
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);
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} else {
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return data;
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}
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return dfd.promise();
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},
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loadImageMetaData: function (data, options) {
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if (options.disabled) {
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return data;
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}
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var that = this,
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dfd = $.Deferred();
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loadImage.parseMetaData(data.files[data.index], function (result) {
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$.extend(data, result);
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dfd.resolveWith(that, [data]);
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}, options);
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return dfd.promise();
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},
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saveImageMetaData: function (data, options) {
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if (!(data.imageHead && data.canvas &&
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data.canvas.toBlob && !options.disabled)) {
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return data;
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}
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var file = data.files[data.index],
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blob = new Blob([
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data.imageHead,
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// Resized images always have a head size of 20 bytes,
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// including the JPEG marker and a minimal JFIF header:
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this._blobSlice.call(file, 20)
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], {type: file.type});
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blob.name = file.name;
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data.files[data.index] = blob;
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return data;
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},
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// Sets the resized version of the image as a property of the
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// file object, must be called after "saveImage":
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setImage: function (data, options) {
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if (data.preview && !options.disabled) {
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data.files[data.index][options.name || 'preview'] = data.preview;
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}
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return data;
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},
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deleteImageReferences: function (data, options) {
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if (!options.disabled) {
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delete data.img;
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delete data.canvas;
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delete data.preview;
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delete data.imageHead;
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}
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return data;
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}
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}
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});
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}));
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