Is not visible, it can only cause flickering (when a new area is exposed): the program does not rely on server filling theĮxposed areas automatically. In october, i realized (I woke with the idea in my head), that windows full of image data don't need any background: background The program (kill -stop, or ctrl-z), and exposing the window: if it's still full of its contents, the programs which use the background-pixmap as the destination of its drawing can be recognized by stopping.xloadimage does flicker on the initial XMapWindow.Gv, or ( xloadimage) this is a nice approach, and i have nothing to add to it. There are some programs, which set the pattern to useful data, for example If such a step was made, a flickering would occur, unless the window was trivial: just that pattern. The server does not draw any color/pattern in the newly exposed parts of the new (raised) active window. In other words, when I switch to a new window (the window is brought above the previously active window), if the background is none, the previous screenĬontents from other windows of the same depth as the window are simply left in place as long as the Server is maintaining backing store, the server automatically tiles the regions with the window'sīackground unless the window has a background of none. When no valid contents are available for regions of a window and either the regions are visible or the (I noted it just by seeing its behaviour, not by looking at the sources!)įor explanation of what None means for backgroundPixmap, I quote (tha last paragraph) from I noted, that Mozilla browser used "None" backgroundPixmap to avoid such flickering. In May 2005 i played with window resizing code in Sawfish WM, and learnt about the importance of GravityĪnd backgroundPixmap. Now that I have so my windows flicker-free, i appreciate I can go on reading, while resizing. Uselessly with a different color, before drawing the intended (useful) content.Įxample: try to run xmag, then enlarge the window (the zoom). When working with graphical applications, I noticed, that in certain situations they flicker: fill an area Points at an excellent article by Dave Marsh, which explains why I seeīold letters when moving windows on an LCD monitor. I have informed them in a heated IRC discussionīilly Biggs (vektor) contacted me and pointed me at anti-flicker efforts in Eclipse( A visual comparison of Eclipse and Firefox's menu redrawing) and gtk+ menus( Eclipse on SWT/GTK+ Performance Notes). They still use background, and thus implicit fill on expose. Related Work rxvt-unicode claims " * Completely flicker-free.", but it's not. Screen and redraw: normally you would see a black window for an instant. Most likely visible when elinks needs to clear entire With rxvt in redrawing screen in atomic transactions. patch for elinks www browser, to cooperate.You can see summary of the method, to patch your application! reactions of other people (mostly negative).How I fight against flickering in X windows index How I fight against flickering in X windowsīy "Flickering" i mean filling an area on the screen/monitor uselessly with a different color, before drawing the useful content.
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