#Flickerless Scrolls
01-Aug-90 09:46:38
Sb: #115106-#Flickerless Scrolls
Fm: jack radigan 76545,201
To: JAMES D. WILLIAMS 72157,3524
Jim,
I've thought about using double-buffering for a 16 color display, but
I've not actually tried it. My initial reaction would be that blasting
text into two bitmaps and scrolling the two bitmaps is going to bring
throughput down to its knees. If I'm missing something basic here and
don't have to double up on blitter usage I'm sure you'll correct me. 😉
What I have thought of doing so that I can get some good performance is
to do copper based scrolling. Of course, it will be unfriendly to
Intuition and have to reside in its own screen, but the throughput should
be quite nice.
Also, take a look at the optimized scroll feature. It minimizes a scroll
operation to the minimum bitplanes and width needed to accomplish it.
-jack-