Compositing Window Manager - Comparison With Stacking Window Managers

Comparison With Stacking Window Managers

The window manager sends each window a message to repaint itself whenever appropriate (such as when it is resized, or when another window passes in front of it). With a stacking manager, the repainting process can become corrupted when a program that is slow, unresponsive or buggy does not respond to messages in a timely manner. A malicious program can cause the system to become unstable by simply neglecting to repaint its window. Then, one or more of the following conditions may result:

  • a clipped window does not repaint uncovered regions, resulting in either blank spaces or a "trail" left behind from another window
  • portions of windows (such as decorative drop shadows) are left behind and not properly painted over
  • the mouse pointer is corrupted
  • screen updates become unbearably slow
  • the entire screen freezes until the program either responds or is terminated

With a compositing manager, if a window stops repainting itself when requested by the window manager, its last repaint will remain displayed and the window might be dimmed. Often the title changes to reflect the status of the window as unresponsive. A program may prevent its window from being moved or unmapped, but generally will not cause repainting problems.

Read more about this topic:  Compositing Window Manager

Famous quotes containing the words comparison with, comparison, stacking, window and/or managers:

    From top to bottom of the ladder, greed is aroused without knowing where to find ultimate foothold. Nothing can calm it, since its goal is far beyond all it can attain. Reality seems valueless by comparison with the dreams of fevered imaginations; reality is therefore abandoned.
    Emile Durkheim (1858–1917)

    It is very important not to become hard. The artist must always have one skin too few in comparison to other people, so you feel the slightest wind.
    Shusha Guppy (b. 1938)

    The Universal Soul, as it is called, has an interest in the stacking of hay, the foddering of cattle, and the draining of peat-meadows.
    Henry David Thoreau (1817–1862)

    The mind too closes as it were. As the window might close of a dark empty room.
    Samuel Beckett (1906–1989)

    We also have to make sure our children know the history of women. Tell them the rotten truth: It wasn’t always possible for women to become doctors or managers or insurance people. Let them be armed with a true picture of the way we want it to be.
    Anne Roiphe (20th century)