Send images with their imageInfo (size, mymetype, width & height)

webclient/components/utilities/utilities-service.js

@@ -0,0 +1,53 @@
+/*
+ Copyright 2014 matrix.org
+ 
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+ 
+ http://www.apache.org/licenses/LICENSE-2.0
+ 
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+ */
+
+'use strict';
+
+/*
+ * This service contains multipurpose helper functions.
+ */
+angular.module('mUtilities', [])
+.service('mUtilities', ['$q', function ($q) {
+    /*
+     * Gets the size of an image
+     * @param {File} imageFile the file containing the image
+     * @returns {promise} A promise that will be resolved by an object with 2 members:
+     *   width & height
+     */
+    this.getImageSize = function(imageFile) {
+        var deferred = $q.defer();
+        
+        // Load the file into an html element
+        var img = document.createElement("img");
+        
+        var reader = new FileReader();  
+        reader.onload = function(e) {   
+            img.src = e.target.result;
+            
+            // Once ready, returns its size
+            deferred.resolve({
+                width: img.width,
+                height: img.height
+            });
+        };
+        reader.onerror = function(e) {
+            deferred.reject(e);
+        };
+        reader.readAsDataURL(imageFile);
+        
+        return deferred.promise;
+    };
+}]);