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angular-fix-image-orientation.js
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angular-fix-image-orientation.js
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(function (angular, EXIF) {
'use strict';
angular.module("cp.ng.fix-image-orientation", []).directive('imgFixOrientation', [orient]);
/**
* Directive definition.
*
* @returns {object}
*/
function orient() {
return {
restrict: 'A',
scope: {
'imgFixOrientation': '='
},
link: linkLogic
};
/**
* {@inheritDoc}
*
* @param {object} scope
* @param {object} element
* @param {object} attrs
* @returns {undefined}
*/
function linkLogic(scope, element, attrs) {
var imageUrl = scope.imgFixOrientation;
if (0 === imageUrl.indexOf('data:image')) {
var base64 = imageUrl.split(',')[1];
var exifData = EXIF.readFromBinaryFile(base64ToArrayBuffer(base64));
reOrient(parseInt(exifData.Orientation || 1, 10), element);
}
else {
var xhr = new XMLHttpRequest();
xhr.open("GET", imageUrl, true);
xhr.responseType = "arraybuffer";
xhr.onload = function(e) {
var arrayBuffer = new Uint8Array(this.response);
var exifData = EXIF.readFromBinaryFile(arrayBuffer.buffer);
reOrient(parseInt(exifData.Orientation || 1, 10), element);
};
xhr.send();
}
}
/**
* Convert base64 string to array buffer.
*
* @param {string} base64
* @returns {object}
*/
function base64ToArrayBuffer(base64) {
var binaryString = window.atob(base64);
var len = binaryString.length;
var bytes = new Uint8Array( len );
for (var i = 0; i < len; i++) {
bytes[i] = binaryString.charCodeAt(i);
}
return bytes.buffer;
}
/**
* Reorient specified element.
*
* @param {number} orientation
* @param {object} element
* @returns {undefined}
*/
function reOrient(orientation, element) {
switch (orientation) {
case 1:
// No action needed
break;
case 2:
element.css({
'-moz-transform': 'scaleX(-1)',
'-o-transform': 'scaleX(-1)',
'-webkit-transform': 'scaleX(-1)',
'transform': 'scaleX(-1)',
'filter': 'FlipH',
'-ms-filter': "FlipH"
});
break;
case 3:
element.css({
'transform': 'rotate(180deg)'
});
break;
case 4:
element.css({
'-moz-transform': 'scaleX(-1)',
'-o-transform': 'scaleX(-1)',
'-webkit-transform': 'scaleX(-1)',
'transform': 'scaleX(-1) rotate(180deg)',
'filter': 'FlipH',
'-ms-filter': "FlipH"
});
break;
case 5:
element.css({
'-moz-transform': 'scaleX(-1)',
'-o-transform': 'scaleX(-1)',
'-webkit-transform': 'scaleX(-1)',
'transform': 'scaleX(-1) rotate(90deg)',
'filter': 'FlipH',
'-ms-filter': "FlipH"
});
break;
case 6:
element.css({
'transform': 'rotate(90deg)'
});
break;
case 7:
element.css({
'-moz-transform': 'scaleX(-1)',
'-o-transform': 'scaleX(-1)',
'-webkit-transform': 'scaleX(-1)',
'transform': 'scaleX(-1) rotate(-90deg)',
'filter': 'FlipH',
'-ms-filter': "FlipH"
});
break;
case 8:
element.css({
'transform': 'rotate(-90deg)'
});
break;
}
}// End reOrient()
}// End orient()
})(window.angular, window.EXIF, window);