| Re: [AD] Xwin system bitmaps? |
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On January 3, 2002 07:47 am, you wrote:
> Thomas Fjellstrom <tfjellstrom@xxxxxxxxxx> writes:
> > Someone who knows the Xwin port, would bitmaps that wrap a shm X bmp type
> > be faster than a regular bmp?
>
> Unlikely, because Xwin port has to update 'screen' pixels and not just
> window. It can not just XCopyArea from shm Pixmap to Window, it has
> to copy pixels from bitmap data to screen data first (actually, to
> shm XImage), then copy XImage to Window. Maybe, if Xwin port were
> using shared memory Pixmap instead of shared memory XImage for screen
> data and for video bitmaps, then it might be faster. It would be much
> simpler if Allegro were not allowing read access to screen data.
>
> I tried to use shared memory Pixmaps in old version of XwinAllegro,
> but it did not work correctly with them, so I decided to use shared
> memory XImages.
Ok... What about a shared memory Ximage BITMAP type? ;)
--
Thomas Fjellstrom
tfjellstrom@xxxxxxxxxx
http://strangesoft.net