Hello,
So with some help I've moved further along to my goal, which I am
grateful for. My next question stems from behaviour I see between
running a DirectFB app on the vesafb (aka vga=791) and a hardware
framebuffer driver like viafb and cyblafb. Basically, I wrote the
application testin on a vesafb system. Now when I run it on the viafb or
cyblafb drivers I experience the same thing and I'm unsure as to why.
Let me attempt to describe the behaviour.
The program has basically 2 screens (by screen I mean views, not
DirectFB screens/layers etc), main menu (works fine as it is drawn and
flipped only once). However the second screen is a little more
complicated. It draws numerous things, and part of that is an animation
of sorts, thus it flips many times before giving control back to the
user. On vesafb, all of this looks perfect. On either driver, each flip
seems to flips between the main menu (minus what I am currently drawing)
and the new screen while the animation goes.
So for example, if I hit the up arrow key, the up arrow flashes and a
paragraph of text scrolls up one third.
To do this, I set a clipping region around the arrow, redraw it
highlighted, clear the clipping region,do a flip (this is done with NULL
in the region), then redraw the text as follows.
I set a clipping region around where text is written, clear it with my
background color, blit an image (only part of it re-draws as it is
clipped) and then draw line after line. And flip.
Obviously the problem stems from the flip with NULL as a region. However
it didn't have a problem on vesafb. Both dfbinfo show identical output
for vesa and the drivers. Ideas?
--
Nathanael D. Noblet
Gnat Solutions, Inc
http://www.gnat.ca/
T 250.385.4613
C 250.383.4613
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