Hi again!
> > > > It should depend only on the number of pixels/row and their color depth.
> > > No. It can depends on alignment and other hardware restrictions.
> > bad.
>
> No - as said, you don't need to care about it. You just use the values form
> the directbuffer descriptor and that's it.
ok.
> > To resum: in true color mode I step from one pixel to the other by adding
> > the size of either uint32 or sizeof( struct....) to pixelPointer.
>
> To be precise: By adding pixelformat->size/8 bytes.
^^^^^
Is 8 bytes right, not 8 bits?
> > When I've reached the last pixel of the row and want to jump into the
> > next row I have to calculate the jump size with
>
> (uint8 *)pixelPointer += stride;
>
> This brings you one pixel down.
yes.
> If you already walked with the pixelPointer,
> you have to compensate like this:
>
> (uint8 *)pixelPointer += stride - already_walked_bytes;
If I'm at the last pixel of a row, the jump should be only the size of one
pixel, or pixelPointer++ to get to the first pixel of the next row. But as
I saw this in a demo, I think this construction has a reason.
I've rewritten the test app and it now does exactly what I wanted. But
still I get a segmentation fault in ggiClose.
gdb says:
Program received signal SIGSEGV, Segmentation fault.
_GGI_mansync_deinit (vis=0x804c9f0) at child.c:266
266 int i, nrvisuals = _GGI_mansync_state.nrvisuals;
(gdb) bt
#0 _GGI_mansync_deinit (vis=0x804c9f0) at child.c:266
Cannot access memory at address 0x40115011.
Any ideas?
Then I have some more questions, where I found no matching documentation:
I'd like to change the mouse pointer pixmap, how can I do that with ggi?
What are those ggiSet/GetGCClipping functions for? what means clipping?
Where would I use this functions?
How do I set the timeval struct in ggiEventPoll to a value that the
function waits infinitly? Is there a macro or something, I found nothing
in the libc info pages.
I want to get only key press events and button press events, therefore I
set in my application:
if( ggiSetEventMask( visual, emPtrButton | emKeyPress ) != 0 )
{
fail( "Couldn't set event mask\n" );
}
theTimer.tv_sec = LONG_MAX;
while ( 1 )
{
if ( ( eventMask = ggiEventPoll( visual, emPtrButton | emKeyPress,
&theTimer ) ) < 0 )
{
fail( "Error in event poll\n" );
}
Why do I still get events when neither a key nor a mouse button was
pressed???
Do I have to use a ggiEventRead call to get an event out of the queue, or
will it be removed automatically by ggiEventPoll?
Are there more undocumented functions like ggiGetCharSize?
gr. matthias
