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Re: High Performance Drawing [message #13705 is a reply to message #13703]

Wed, 23 January 2008 17:10

cbpporter is currently offline

cbpporter
Messages: 1401
Registered: September 2007

Ultimate Contributor

luzr wrote on Wed, 23 January 2008 17:01

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

Nothing wrong with BackPaint. IMO, it works just great.

But I need a GUI which is used to create quite complex images, one step at a time, including alpha-blending and antialiasing, so I'm basically stucked with using a manual backbuffer, because I need to both read and write raw pixel information. Painting that buffer is too slow.

These shapes were organized an a tree structure, and when I want to modify one of them by mouse interaction, I would deactivate the old element, redraw the image without it, and during drag operations with mouse only use a sketch of that given figure, even something as simple as RectBand (I don't remember how the rubber band rectangle from U++ was called).

Quote:

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

Not transparent, but still excellent performance and no flicker. Like a full screen populated ArrayCtrl.

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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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