We are writing an X-based application where we create and use our own private
colour map. I have read and understood about the reasons why we will get colour
flashing on a machine that does not have hardware support for a number of colour
maps, and we have taken measures to reduce this flashing.
However, I do not understand why we get colour map flashing when changing focus
between windows in our own application. Note that our application exclusively
uses the private colour map and does not reference the default colour map at
all. The reason seems to be that when the window manager reparents our windows
( on a map ) the window manager window references the default colourmap.
Therefore, when we change focus the window manager installs the default colour
map to draw its windows, and then installs the private colour map to draw our
windows. This leads to the colours flashing when changing focus. Is there an
underlying reason why the window manager does not use the colour map of the
window it is reparenting, or is there some sort of resource we can set so that
it does ?
Yours faithfully,
Nick Yates.
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Received on Fri Apr 03 1998 - 02:30:09 BST