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gaia/shared/js/contacts/utilities/image_square.js

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+'use strict';
+
+var utils = window.utils || {};
+
+if (typeof utils.squareImage === 'undefined') {
+  utils.squareImage = function(blob, callback) {
+    var img = document.createElement('img');
+    var url = URL.createObjectURL(blob);
+    img.src = url;
+
+    function cleanupImg() {
+      img.src = '';
+      URL.revokeObjectURL(url);
+    }
+
+    img.onerror = cleanupImg;
+
+    img.onload = function onBlobLoad() {
+      var width = img.width;
+      var height = img.height;
+
+      if (width === height) {
+        cleanupImg();
+        callback(blob);
+      } else {
+        var canvas = document.createElement('canvas');
+        var min = canvas.width = canvas.height = Math.min(width, height);
+        var context = canvas.getContext('2d', { willReadFrequently: true });
+        context.drawImage(img, (width - min) / 2, (height - min) / 2, min, min,
+                          0, 0, min, min);
+        cleanupImg();
+        canvas.toBlob(function onCanvasToBlob(canvasBlob) {
+          context = null;
+          canvas.width = canvas.height = 0;
+          canvas = null;
+          callback(canvasBlob);
+        }, 'image/jpeg', 0.95);
+      }
+    };
+  }; // utils.squareImage
+} // if