On Wed, 14 Jul 2004, Phil Roets wrote:
> Hi Everybody,
>
> Can someone please help me with this problem or tell me where to look
> ! Google did not have anything usefull, or maybe I phrased the searches
> incorrectly.
>
> We have an existing application that flashes selected graphic elements in a
> synchronized way by alternating their color map entry values at fixed
> intervals, using the PseudoColor visual (8 bit depth).
>
> The application needs to be upgraded to run on 24-bit depth
> displays. Since DirectColor is badly supported by many hardware/dirver
> combinations, we have to try and get the same effect with the TrueColor
> visual which does not support changing of colour map entries.
>
> Is there any means of flashing specific graphic elements without redrawing
> the graphics on each flash phase ?
No, you can't modify the TrueColor colormap. You should be using
DirectColor or redrawings parts (you can draw portions of the screen
with XOR or invert type operations - draw once to change, draw again to
restore). Most mainstream hardware/drivers should support DirectColor.
Mark.
>
> Will be VERY glad to hear from somebody!
>
> Phil Roets
>
> (please copy direct to my e-mail address)
> Company : CEO GEOsystems - Technical Software Design and Product Developers.
> Physical address : 62 Glenwood Road, Lynnwoodglen, Pretoria, Rep of South
> Africa
> Snail Mail : P O Box 72147, Lynnwoodridge, 0040, Rep of South Africa.
> Telephone : +27 (12) 348-8653
> Fax : +27 (12) 348-8653 ( Weekdays only : 06h00 - 14h30 GMT )
> phil@ geo.co.za
>
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