Created
May 10, 2018 16:37
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Canvas toBlob() polyfill
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| (function(global) { | |
| if (!('HTMLCanvasElement' in global)) return; | |
| if (!('toDataURL' in global.HTMLCanvasElement.prototype)) return; | |
| if ('toBlob' in global.HTMLCanvasElement.prototype) return; | |
| Object.defineProperty(global.HTMLCanvasElement.prototype, 'toBlob', { | |
| value: function(callback/*, type, encoderOptions*/) { | |
| var url = this.toDataURL.apply(this, [].slice.call(arguments, 1)); | |
| var m = /^data:(.*?);base64,(.*)$/.exec(url), type = m[1], b64 = m[2]; | |
| setTimeout(function() { | |
| callback(new Blob([ | |
| new Uint8Array(global.atob(b64).split('').map(function(c) { | |
| return c.charCodeAt(0); | |
| }))], {type: type})); | |
| }, 0); | |
| }, writable: true, enumerable: true, configurable: true}); | |
| }(self)); |
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