Re: XForms: Colormap & fl_image

From: Steve Lamont (
Date: Wed Apr 26 2000 - 09:19:44 EDT

  • Next message: Yann Guichoux: "Re: XForms: Colormap & fl_image"

    # To subscribers of the xforms list from (Steve Lamont) :

    > My problem is that when i display an image within one of the windows i
    > created, and when i select another window of my application with the
    > mouse cursor, all the colors of the displayed image are changing..and i
    > don't know how to get the original colormap back .

    Do you mean that the colors in the displayed image change
    *permanently* -- even when you move the mouse back out of the image
    - or just that you get "Technicolor" flashing?

    If the problem is the latter, if you have a display that supports only
    one Colormap at a time and if you have multiple Windows, each with its
    own Colormap, it is inevitable that you're going to have this flashing
    phenomenon, since the server loads a new Colormap when the Window
    becomes active (indicated by an EnterNotify event).

    If possible, the best thing is for all Windows to use a shared
    Colormap, using some color approximation or dithering scheme to spread
    the error in as imperceptible a manner as possible.

    Even better -- if your display supports TrueColor mode, use that.

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