Path: utzoo!attcan!uunet!snorkelwacker!bloom-beacon!INTELLICORP.COM!TRANLE
From: TRANLE@INTELLICORP.COM (Minh Tran-Le)
Newsgroups: comp.windows.x
Subject: XCopyArea pixmap to pixmap: why is it so slow ?
Message-ID: <8912021948.AA02569@expo.lcs.mit.edu>
Date: 2 Dec 89 19:49:38 GMT
Sender: root@athena.mit.edu (Wizard A. Root)
Organization: The Internet
Lines: 15

I have done some perfomance testing of XCopyArea and I have found that on
most of the servers that we use (Vax GPX, hp, IBM Ps2) that it is around
10 times slower to do a XCopyArea from pixmap to pixmap then to do XCopyArea
from window to window. The window an pixmap that we where using was 500x500.

Does anybody know if it was a design decision not to optimize copyarea for
pixmap or is it a general hardware limitation ? So far I found that only the
DecStation (mips) has a copyarea function that is a fast on pixmaps than
on windows. 

Thanks, Minh Tran-Le.

Arpanet: tranle@intellicorp.com
Uucp:    ..sun!icmv!mtranle
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