b38dea0597
Share Gaia assets and adapters, keep private profiles and development documents local, and update both public READMEs.
41 lines
1.2 KiB
JavaScript
Executable file
41 lines
1.2 KiB
JavaScript
Executable file
'use strict';
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var utils = window.utils || {};
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if (typeof utils.squareImage === 'undefined') {
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utils.squareImage = function(blob, callback) {
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var img = document.createElement('img');
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var url = URL.createObjectURL(blob);
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img.src = url;
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function cleanupImg() {
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img.src = '';
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URL.revokeObjectURL(url);
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}
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img.onerror = cleanupImg;
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img.onload = function onBlobLoad() {
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var width = img.width;
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var height = img.height;
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if (width === height) {
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cleanupImg();
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callback(blob);
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} else {
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var canvas = document.createElement('canvas');
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var min = canvas.width = canvas.height = Math.min(width, height);
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var context = canvas.getContext('2d', { willReadFrequently: true });
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context.drawImage(img, (width - min) / 2, (height - min) / 2, min, min,
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0, 0, min, min);
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cleanupImg();
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canvas.toBlob(function onCanvasToBlob(canvasBlob) {
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context = null;
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canvas.width = canvas.height = 0;
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canvas = null;
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callback(canvasBlob);
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}, 'image/jpeg', 0.95);
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}
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};
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}; // utils.squareImage
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} // if
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