Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!efi!chiu
From: chiu@efi.com (Chan Chiu)
Newsgroups: comp.windows.x
Subject: Many big pixmaps
Message-ID: <1990Nov1.192942.4819@efi.com>
Date: 1 Nov 90 19:29:42 GMT
Organization: Electronics For Imaging, Inc.
Lines: 20

Hi net :

My application is color image editing and display software. Typically, we
have minimum of 24-bit pixmap with fairly size (>1 Meg). And, we have
a few active pixmaps (~ 5-10). And, all these images, we may also
want the application to do the editting (change color) and scrolling.

All these requirements seem to slow down the performance. Questions:

1, Should I have pixmap of window's viewport size ? When scrooling,
   just change to content of pixmap ?
2, Or, Should I just create pixmap of its natural size and have 
   the scroll window to do the scrolling ? Of course, the pixmap
   size can be very large (tiff image).
3, What are some other tricks can be used to both conserve memory
   requirents and improve the performance ?

   Thanks.

   /CC