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var ewww_webp_supported = false;
// webp detection adapted from https://developers.google.com/speed/webp/faq#how_can_i_detect_browser_support_using_javascript
function check_webp_feature(feature, callback) {
callback = (typeof callback !== 'undefined') ? callback : function(){};
if (ewww_webp_supported) {
callback(ewww_webp_supported);
return;
}
var kTestImages = {
alpha: "UklGRkoAAABXRUJQVlA4WAoAAAAQAAAAAAAAAAAAQUxQSAwAAAARBxAR/Q9ERP8DAABWUDggGAAAABQBAJ0BKgEAAQAAAP4AAA3AAP7mtQAAAA==",
};
var img = new Image();
img.onload = function () {
ewww_webp_supported = (img.width > 0) && (img.height > 0);
if (callback) {
callback(ewww_webp_supported);
}
};
img.onerror = function () {
if (callback) {
callback(false);
}
};
img.src = "data:image/webp;base64," + kTestImages[feature];
}
check_webp_feature('alpha');