Use grid wallpaper to highlight transparent image. Support to view the large image by holding the right mouse and drag.
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// ==UserScript==
// @name Image viewer
// @namespace http://devs.forumvi.com/
// @description Use grid wallpaper to highlight transparent image. Support to view the large image by holding the right mouse and drag.
// @version 2.0.1
// @icon http://i.imgur.com/ItcjCPc.png
// @author Zzbaivong
// @oujs:author baivong
// @license MIT; https://baivong.mit-license.org/license.txt
// @match http://*/*
// @match https://*/*
// @noframes
// @supportURL https://github.com/lelinhtinh/Userscript/issues
// @run-at document-idle
// @grant GM_addStyle
// ==/UserScript==
(function () {
'use strict';
/**
* Background mode
* @type {string} dark
* light
*/
var theme = 'dark',
color,
doc = document;
if (theme === 'light') {
color = ['#eee', 'white'];
} else {
color = ['gray', '#444'];
}
function scrollByDragging(container, disableH, disableV) {
function mouseUp(e) {
if (e.which !== 3) return;
window.removeEventListener('mousemove', mouseMove, true);
container.style.cursor = 'default';
}
function mouseDown(e) {
if (e.which !== 3) return;
pos = {
x: e.clientX,
y: e.clientY
};
window.addEventListener('mousemove', mouseMove, true);
container.style.cursor = 'move';
}
function mouseMove(e) {
if (!disableH) container.scrollLeft -= (-pos.x + (pos.x = e.clientX));
if (!disableV) container.scrollTop -= (-pos.y + (pos.y = e.clientY));
}
var pos = {
x: 0,
y: 0
};
container.oncontextmenu = function (e) {
e.preventDefault();
};
container.addEventListener('mousedown', mouseDown, false);
window.addEventListener('mouseup', mouseUp, false);
}
if (document.contentType.indexOf('image/') === 0) {
GM_addStyle('body{background-attachment: fixed !important; background-position: 0px 0px, 10px 10px !important; background-size: 20px 20px !important; background-image: linear-gradient(45deg, ' + color[0] + ' 25%, transparent 25%, transparent 75%, ' + color[0] + ' 75%, ' + color[0] + ' 100%),linear-gradient(45deg, ' + color[0] + ' 25%, ' + color[1] + ' 25%, ' + color[1] + ' 75%, ' + color[0] + ' 75%, ' + color[0] + ' 100%) !important;} body > img {background-color: transparent !important; background-image: none !important; display: block; margin: auto; position: absolute; left: 0; top: 0; right: 0; bottom: 0;} body > img:hover {background: rgba(0, 0, 0, 0.4) !important; outline: 3px solid #333;} body > img[style*="cursor: zoom-out;"], body > img.overflowing {position: relative !important;}');
scrollByDragging(doc.body);
scrollByDragging(doc.documentElement);
}
}());