bogstad@HOPKINS-EECS-BRAVO.ARPA ("William J. Bogstad") (11/11/85)
Date: Sun, 10 Nov 85 10:10:43 -0100 From: ucdavis!lll-crg!seismo!mcvax!inria!kahn@ucbvax.berkeley.edu (Gilles Kahn) Message-Id: <8511100910.AA02999@inria.UUCP> To: lll-crg!hopkins-eecs-bravo.arpa!bogstad Subject: Graphics on the ridge I have used succesfully the copybits primitive. It is fast and well designed. However, I have two difficulties: 1. The mask operation is insufficiently specified and not well implemented for my purposes. I would like the repeating pattern to start right at the destination's top left corner rather than be overinfluenced by physical considerations. In this way I can have to copies of a bitmap painted with some pattern, without any alignment worry. 2. If I use copybits, it is because I want to prepare bitmaps off-screen and then move them in the screen memory area. Now, I do not know how to draw a vector (or a polyline) somewhere in memory. Can somebody help me? One more question? Is there any other way to refresh the display than to call gflush? The real time spent in gflush seems large, in the milliseconds range, even when no bit of the screen has been touched. Gilles Kahn