Re: Some benchmarking on graphics

        Hi Michael!

On 22 Feb 03 at 12:07, "Michael" (Michael Peuser h) wrote:
 Michael> here is a small script.

 Michael> Using Bitmaps instead of Images gave an breathtaking speed up
 Michael> from 3 to = 22 fps (under Windows 2000) Also buffered mode with
 Michael> direct canvas draw (which generally is already = very fast) will
 Michael> again speed up things considerable (in contrast to expectations

That's expected. DeviceBitmaps are supposed to correspond to a video
device format in best possible way, hence the name. Images may ( and
usually do ) undergo conversion, which of course slows things a lot.

 Michael> of "buffering") Last but not least: changing colors is SLOW.

Most probably this should be attributed to a cost of perl-to-C calls,
but anyway one can't do much about it.

 Michael> I would be interested very much in UNIX results.

Here:
FreeBSD v4.3, XFree86 v4.0.3, AMD Athlon 650MHz, 800x800

               Canvas Image DeviceBitmap
0 19 2 11
B 11 2 9
M 2 1 2
S 21 3 12
BM 2 1 2
BS 13 3 11
MS 3 2 2
BMS 2 1 2

On X though your benchmarking would be inaccurate, since you
are using Widget::repaint call - which can be cached, and
involves a client-server roundtrip. Explicit begin_paint/end_paint
should do better.

-- 
Sincerely,
	Dmitry
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