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List:       koffice
Subject:    How can I write KWord/KOffice part, which redraws itself very slowly ?
From:       Kamil Dobkowski <kamildobk () poczta ! onet ! pl>
Date:       2001-01-20 17:02:28
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Hi !
I have a problem. My KoPart redraws itself very slowly ( 3d surface ). Under 
normal conditions this operation is performed in little parts from a 
background handler function, but when the part is embendded in KWord
it must be done in a single function call. What should I do ? KWord requests 
redrawing each time I touch a slider. I tried to buffer the contents in a 
pixmap but I don't know how to find out if the part is rendered on
screen or if it is printed ( I can't print the pixmap, looks ugly ! ) . 
Pixmap-buffering doesn't work well too. KWord buffers page in QPicture, 
QPicture has fixed 24 bit depth, so when I create bitmap with the default 
screen depth ( 16-bit ) I get following operations: painting on the picture - 
convert bitmap depth from 16 to 24, painting a picture on screen - convert 
bitmap depth from 24 to 16. Even my K6/400 with a local X-server dies, when 
scrolling document with a few such parts embedded.It would be perfect if I 
had my own widget for on-screen rendering, but it seems to be impossible.
Uff ! I have no more ideas. Are there any other solutions ?


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