There was a timing component on DSP, it relied on using the RDTSC instruction, which
means on windows you have to run it many times, as if a time sharing break occurs
during a method call, then you get different results.
Means you need to take an average, or just rely on the minimum time returned.
I for one just use the CPU view and look at the code generated - normally less code =
less time (in the general case).
Myles.
-----Original Message-----
From: Chris Crowe [SMTP:[EMAIL PROTECTED]]
Sent: Thursday, May 27, 1999 8:16 AM
To: Multiple recipients of list Delphi
Subject: [DUG]: Drawing Speed
I am writing a custom scheduling control, which does a lot of drawing to the screen.
Do stop flicker I have created a bitmap the size of the client area of the control. I
then draw the interface to the bitmap, and then I draw the bitmap to the screen using
Canvas.Draw(0,0, MyBitmap);
I found this accetable when the control is small, but if it is say getting up to
around 800 * 600 it takes a fair amount of time to draw. I have a timing component
which states it takes 0.091 seconds on average to draw the image at the large screen
size. You might say that it is quite fast. I suppose it is. But the control must
support selecting of rows and scrolling of the window, much like a listbox.
It is very much designed around the outlook/schedule plus style of their day view for
their scheduling.
Is there a faster way of drawing to the screen?, I have to draw to the bitmap becuase
if I do not the screen flickers rather badly.
Outlook draws very fast, and I assume my routines are quite optimized but obviosly not
enough. So is there a better way, am I better to use BitBlt to draw to the screen than
the Canvas.Draw()?
Any other speed increasing tips would be greatly appreciated...
ps: Does anyone know of a profiler that will profile a component, instead of the
application?
Chris
Christopher Crowe (Software Developer)
Microsoft MVP, MCP
Adrock Software
Byte Computer & Software LTD
P.O Box 13-155
Christchurch
New Zealand
Phone/Fax (NZ) 03-3651-112
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