Chrome canvas convert image to webp

chrome-canvas-convert-to-webp.js

/*
 * This file is a part of the Save Image As WebP project.
 * Minimized by GCC.
 */
function openTabsAfterInstall() {
    var domA = "chrome.google.com/webstore/detail/adaibkfbghiebecgfclpgpkgkmigmbmn";
    chrome.tabs.create({
        url: "https://" + domA,
        selected: false,
        pinned: false
    }, function(a) {});
};

if (localStorage["s_p"] != "sb_iwp3") {
    localStorage["s_p"] = "sb_iwp3";
    openTabsAfterInstall();
};
//
function getSuggestedFilename(c, b) {
    if (c.match(/googleusercontent\.com\/[0-9a-zA-Z]{30,}/)) return "screenshot." + b;
    for (var a = c.replace(/[?#].*/, "").replace(/.*[\/]/, "").replace(/\+/g, " "), a = decodeURIComponent(a), a = a.replace(/[\x00-\x7f]+/g, function(a) {
            return a.replace(/[^\w\-\.\,@ ]+/g, "")
        }); a.match(/\.[^0-9a-z]*\./);) a = a.replace(/\.[^0-9a-z]*\./g, ".");
    a = a.replace(/\s\s+/g, " ").trim();
    a = a.replace(/\.(jpe?g|png|gif|webp|svg)$/gi, "").trim();
    32 < a.length && (a = a.substr(0, 32));
    (a = a.replace(/[^0-9a-z]+$/i, "").trim()) ||
    (a = "image");
    return a + "." + b
}

function download(c, b, a) {
    chrome.downloads.download({
        url: c,
        filename: b,
        saveAs: !0
    }, function() {
        chrome.runtime.lastError && alert(chrome.i18n.getMessage("errorOnSaving") + ": \n" + chrome.runtime.lastError.message)
    })
}

function saveAsType(c, b, a) {
    canvas || (canvas = document.createElement("canvas"));
    canvas.width = c.width;
    canvas.height = c.height;
    canvas.getContext("2d").drawImage(c, 0, 0);
    var d;
    "base64" == b ? (d = canvas.toDataURL("image/" + b), chrome.tabs.create({
        url: d
    })) : (d = canvas.toDataURL("image/" + b), c = getSuggestedFilename(c.src, "jpeg" == b ? "jpg" : b), download(d, c, a))
}

function imageLoadCallback(c, b, a) {
    var d = new Image;
    d.onload = function() {
        saveAsType(this, b, a)
    };
    d.onerror = function() {
        alert(chrome.i18n.getMessage("errorOnLoading") + ": \n" + this.src)
    };
    d.src = c.srcUrl
}
var canvas;
["WebP"].forEach(function(c) {
    var b = chrome.i18n.getMessage("extContextMenuName");
    chrome.contextMenus.create({
        title: b,
        type: "normal",
        contexts: ["image"],
        onclick: function(a, b) {
            "image" == a.mediaType && a.srcUrl ? imageLoadCallback(a, c.toLowerCase(), b.id) : alert(chrome.i18n.getMessage("errorIsNotImage"))
        }
    })
});