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Re: High Performance Drawing [message #13703 is a reply to message #13702]

Wed, 23 January 2008 17:01

mirek is currently offline

mirek
Messages: 13975
Registered: November 2005

Ultimate Member

cbpporter wrote on Wed, 23 January 2008 10:56

So basically I need to update stuff on mouse move, and I came to this three cases that I tested:

1. When drawing a line in paint method, it is fast, but due to the need of clearing the previous position, it is flickery. Not using DrawRect, only updating minimum zone is less flickery, but still bad.

2. When pre-caching the final result in and ImageDraw, it is very slow, but no flicker.

Maybe I have lost the context (again?), but what is wrong with BackPaint?

Quote:

And the strange one:

3. When instead of drawing a line, I'm resizing a control, I get no flicker and good performance. This case doesn't have the Refresh call, and also, the control itself is probably backbuffered, that's why no flicker. But why is the performance still good?

If widget is transparent, very complex code is used to paint it. Is it transparent?

Mirek

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[Message index]

		High Performance Drawing By: cbpporter on Sun, 16 December 2007 12:48
		Re: High Performance Drawing By: mirek on Sun, 16 December 2007 23:15
		Re: High Performance Drawing By: cbpporter on Mon, 17 December 2007 01:47
		Re: High Performance Drawing By: mirek on Mon, 17 December 2007 14:47
		Re: High Performance Drawing By: cbpporter on Tue, 25 December 2007 13:02
		Re: High Performance Drawing By: mirek on Wed, 26 December 2007 14:16
		Re: High Performance Drawing By: cbpporter on Wed, 26 December 2007 17:01
		Re: High Performance Drawing By: mirek on Tue, 01 January 2008 10:54
		Re: High Performance Drawing By: phirox on Tue, 01 January 2008 21:21
		Re: High Performance Drawing By: phirox on Tue, 01 January 2008 23:54
		Re: High Performance Drawing By: cbpporter on Wed, 02 January 2008 18:11
		Re: High Performance Drawing By: mirek on Wed, 02 January 2008 22:00
		Re: High Performance Drawing By: phirox on Sat, 05 January 2008 19:55
		Re: High Performance Drawing By: mirek on Sun, 06 January 2008 08:54
		Re: High Performance Drawing By: cbpporter on Wed, 23 January 2008 15:06
		Re: High Performance Drawing By: cbpporter on Wed, 23 January 2008 16:56
		Re: High Performance Drawing By: mirek on Wed, 23 January 2008 17:01
		Re: High Performance Drawing By: cbpporter on Wed, 23 January 2008 17:10
		Re: High Performance Drawing By: cbpporter on Fri, 01 February 2008 11:02
		Re: High Performance Drawing By: cbpporter on Fri, 01 February 2008 16:27

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