106 lines
3.1 KiB
JavaScript
106 lines
3.1 KiB
JavaScript
/**
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* Terms:
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*
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* Uint8Array, FileReader, BlobBuilder, atob, ArrayBuffer
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* @fileOverview Image控件
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*/
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define([
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'../../base'
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], function( Base ) {
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var urlAPI = window.createObjectURL && window ||
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window.URL && URL.revokeObjectURL && URL ||
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window.webkitURL,
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createObjectURL = Base.noop,
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revokeObjectURL = createObjectURL;
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if ( urlAPI ) {
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// 更安全的方式调用，比如android里面就能把context改成其他的对象。
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createObjectURL = function() {
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return urlAPI.createObjectURL.apply( urlAPI, arguments );
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};
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revokeObjectURL = function() {
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return urlAPI.revokeObjectURL.apply( urlAPI, arguments );
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};
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}
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return {
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createObjectURL: createObjectURL,
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revokeObjectURL: revokeObjectURL,
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dataURL2Blob: function( dataURI ) {
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var byteStr, intArray, ab, i, mimetype, parts;
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parts = dataURI.split(',');
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if ( ~parts[ 0 ].indexOf('base64') ) {
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byteStr = atob( parts[ 1 ] );
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} else {
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byteStr = decodeURIComponent( parts[ 1 ] );
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}
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ab = new ArrayBuffer( byteStr.length );
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intArray = new Uint8Array( ab );
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for ( i = 0; i < byteStr.length; i++ ) {
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intArray[ i ] = byteStr.charCodeAt( i );
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}
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mimetype = parts[ 0 ].split(':')[ 1 ].split(';')[ 0 ];
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return this.arrayBufferToBlob( ab, mimetype );
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},
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dataURL2ArrayBuffer: function( dataURI ) {
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var byteStr, intArray, i, parts;
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parts = dataURI.split(',');
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if ( ~parts[ 0 ].indexOf('base64') ) {
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byteStr = atob( parts[ 1 ] );
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} else {
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byteStr = decodeURIComponent( parts[ 1 ] );
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}
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intArray = new Uint8Array( byteStr.length );
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for ( i = 0; i < byteStr.length; i++ ) {
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intArray[ i ] = byteStr.charCodeAt( i );
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}
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return intArray.buffer;
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},
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arrayBufferToBlob: function( buffer, type ) {
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var builder = window.BlobBuilder || window.WebKitBlobBuilder,
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bb;
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// android不支持直接new Blob, 只能借助blobbuilder.
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if ( builder ) {
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bb = new builder();
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bb.append( buffer );
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return bb.getBlob( type );
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}
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return new Blob([ buffer ], type ? { type: type } : {} );
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},
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// 抽出来主要是为了解决android下面canvas.toDataUrl不支持jpeg.
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// 你得到的结果是png.
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canvasToDataUrl: function( canvas, type, quality ) {
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return canvas.toDataURL( type, quality / 100 );
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},
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// imagemeat会复写这个方法，如果用户选择加载那个文件了的话。
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parseMeta: function( blob, callback ) {
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callback( false, {});
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},
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// imagemeat会复写这个方法，如果用户选择加载那个文件了的话。
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updateImageHead: function( data ) {
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return data;
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}
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};
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}); |