modernizr
Version:
Modernizr is a JavaScript library that detects HTML5 and CSS3 features in the user’s browser.
44 lines (37 loc) • 2.22 kB
JavaScript
/*!
{
"name": "EXIF Orientation",
"property": "exiforientation",
"tags": ["image"],
"async": true,
"authors": ["Paul Sayre"],
"notes": [{
"name": "Article by Dave Perrett",
"href": "http://recursive-design.com/blog/2012/07/28/exif-orientation-handling-is-a-ghetto/"
},{
"name": "Article by Calvin Hass",
"href": "http://www.impulseadventure.com/photo/exif-orientation.html"
}]
}
!*/
/* DOC
Detects support for EXIF Orientation in JPEG images.
iOS looks at the EXIF Orientation flag in JPEGs and rotates the image accordingly. Most desktop browsers just ignore this data.
*/
define(['Modernizr', 'addTest'], function( Modernizr, addTest ) {
// Bug trackers:
// bugzil.la/298619 (unimplemented)
// crbug.com/56845 (looks incomplete)
// webk.it/19688 (available upstream but its up all ports to turn on individually)
Modernizr.addAsyncTest(function() {
var img = new Image();
img.onerror = function() {
addTest('exiforientation', false, { aliases: ['exif-orientation'] });
};
img.onload = function() {
addTest('exiforientation', img.width !== 2, { aliases: ['exif-orientation'] });
};
// There may be a way to shrink this more, it's a 1x2 white jpg with the orientation flag set to 6
img.src = "data:image/jpeg;base64,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";
});
});