1. Wish List Item
One of the most sluggish parts in about all the DOS window manager programs
I've written has been dragging the window around on the screen. The problem
is that the line is an XOR of the pixels - something that's not supported
natively. I can live without it, but... 
Could a native xor_line (and perhaps xor_polygon) be added to the Euphoria
library?
Thanks!
-- David Cuny
2. Re: Wish List Item
> Could a native xor_line (and perhaps xor_polygon) be added to the =
Euphoria
> library?
While we're at it, how about xor_bitmap? That would probably be the most =
efficient of them all.
Michael J. Sabal
3. Re: Wish List Item
Mike Sabal wrote:
> how about xor_bitmap?
I considered asking for that, but I have the impression that Robert would be
hard-pressed to make a native version of xor_bitmap significantly faster
than the 'pure' version.
He's mentioned before that he's just using the graphics library that's
supplied with the Watcom compiler, and not 'hand-rolling' his own code here.
The odds are pretty good that xor_line and xor_poly are part of that
library, and he simply decided not to wrap them. So adding these *should* be
fairly cheap.
On the other hand, I doubt that there's a close match to an xor_bitmap
routine. In high level, it looks something like this:
for each scanline in the bitmap do
pixel( xor( get_pixel( scanline from screen ), scanline from bitmap )
)
end for
He's said a couple of times that pixel and get_pixel are about as efficient
as they can get. So I doubt that even if he created a 'native' version of
xor_bitmap that it would run much faster than the high-level version.
Then again, I could be entirely wrong.
-- David Cuny
4. Re: Wish List Item
How about in-line assembly then the users could add the features.
5. Re: Wish List Item
- Posted by Robert Craig <rds at ATTCANADA.NET>
Mar 24, 2000
-
Last edited Mar 25, 2000
David Cuny writes:
> Could a native xor_line (and perhaps xor_polygon) be
> added to the Euphoria library?
That's been on my list for a while. I think Jiri asked for it.
I'll bump up the priority. It would also help you to quickly xor
a whole bitmap picture.
Regards,
Rob Craig
Rapid Deployment Software
http://www.RapidEuphoria.com
6. Re: Wish List Item
Robert Craig wrote:
> [xor_line's] been on my list for a while. I think
> Jiri asked for it. I'll bump up the priority. It would
> also help you to quickly xor a whole bitmap picture.
Thanks. It didn't occur to me that you could XOR a bitmap simply by XORing
the screen and then drawing the image again. D'oh!
-- David Cuny
