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Image Background Color

Sets a checkerboard (or color) background on images viewed standalone.

Jak nainstalovat

K instalaci tototo skriptu si budete muset nainstalovat rozšíření jako Tampermonkey, Greasemonkey nebo Violentmonkey.

You will need to install an extension such as Tampermonkey to install this script.

K instalaci tohoto skriptu si budete muset nainstalovat rozšíření jako Tampermonkey nebo Violentmonkey.

K instalaci tohoto skriptu si budete muset nainstalovat rozšíření jako Tampermonkey nebo Userscripts.

You will need to install an extension such as Tampermonkey to install this script.

K instalaci tohoto skriptu si budete muset nainstalovat manažer uživatelských skriptů.

(Už mám manažer uživatelských skriptů, nechte mě ho nainstalovat!)

Jak nainstalovat

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

(Už mám manažer uživatelských stylů, nechte mě ho nainstalovat!) 

// ==UserScript==
// @name        Image Background Color
// @namespace   leaumar
// @match       *://*/*
// @grant       none
// @version     2
// @author      [email protected]
// @description Sets a checkerboard (or color) background on images viewed standalone.
// @license     MPL-2.0
// @icon        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
// ==/UserScript==

const checkerBoard = {
  backgroundColor: 'darkgrey',
  backgroundImage: 'linear-gradient(45deg, grey 25%, transparent 25%, transparent 75%, grey 75%, grey), linear-gradient(45deg, grey 25%, transparent 25%, transparent 75%, grey 75%, grey)',
  backgroundPosition: '0 0, 2vmin 2vmin',
  backgroundSize: '4vmin 4vmin',
};

function setBackground(node) {
  Object.assign(node.style, checkerBoard);
  // or assign a fixed color if you want
  // node.style.backgroundColor = '#333';
}

function getStandaloneImage() {
  const tags = [...document.body.childNodes]
    .filter(node => node.nodeName !== '#text');

  return tags.length === 1 && tags[0].nodeName === 'IMG' ? tags[0] : null;
}

function clearAllBackgrounds(upFrom) {
  let current = upFrom;
  while (current?.style != null) {
    current.style.background = 'unset';
    current = current.parentNode;
  }
}

(function main() {
  const img = getStandaloneImage();
  if (img != null) {
    clearAllBackgrounds(img);
    setBackground(document.body);
  }
})();