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Obscure only actual windows for i3lock
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#!/usr/bin/env python2.7 | |
# -*- coding: utf-8 -*- | |
# vim:ts=2:sw=2:expandtab | |
import os | |
import xcb | |
from xcb.xproto import * | |
from PIL import Image | |
XCB_MAP_STATE_VIEWABLE = 2 | |
def screenshot(): | |
os.system('import -window root /tmp/.i3lock.png') | |
def xcb_fetch_windows(): | |
""" Returns an array of rects of currently visible windows. """ | |
x = xcb.connect() | |
root = x.get_setup().roots[0].root | |
rects = [] | |
# iterate through top-level windows | |
for child in x.core.QueryTree(root).reply().children: | |
# make sure we only consider windows that are actually visible | |
attributes = x.core.GetWindowAttributes(child).reply() | |
if attributes.map_state != XCB_MAP_STATE_VIEWABLE: | |
continue | |
rects += [x.core.GetGeometry(child).reply()] | |
return rects | |
def obscure_image(image): | |
""" Obscures the given image. """ | |
size = image.size | |
pixel_size = 9 | |
image = image.resize((size[0] / pixel_size, size[1] / pixel_size), Image.NEAREST) | |
image = image.resize((size[0], size[1]), Image.NEAREST) | |
return image | |
def obscure(rects): | |
""" Takes an array of rects to obscure from the screenshot. """ | |
image = Image.open('/tmp/.i3lock.png') | |
for rect in rects: | |
area = ( | |
rect.x, rect.y, | |
rect.x + rect.width, | |
rect.y + rect.height | |
) | |
cropped = image.crop(area) | |
cropped = obscure_image(cropped) | |
image.paste(cropped, area) | |
image.save('/tmp/.i3lock.png') | |
def lock_screen(): | |
os.system('i3lock -u -i /tmp/.i3lock.png') | |
if __name__ == '__main__': | |
# 1: Take a screenshot. | |
screenshot() | |
# 2: Get the visible windows. | |
rects = xcb_fetch_windows() | |
# 3: Process the screenshot. | |
obscure(rects) | |
# 4: Lock the screen | |
lock_screen() |
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