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Correct buffering technique? [message #10581]

Tue, 17 July 2007 17:10

mrjt
Messages: 705
Registered: March 2007
Location: London

Contributor

I have several ctrls with slow Paint functions that display complex real-time data. Becuase certain actions can cause lots of display refreshes (like dragging a window) I would like to maintain a buffer to reduce CPU load between refreshes:

		if (bufferdirty) {
			buffer.Create(GetView().Size());
			BufferPaint(buffer);
			bufferdirty = false;
		}
		buffer.Put(w, 0, 0);

buffer is a BackDraw object (I was going to use ImageDraw before I saw BackDraw). This seems to work OK, but is this the way to do it?

Cheers,
James

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Re: Correct buffering technique? [message #10601 is a reply to message #10581]

Wed, 18 July 2007 09:03

mirek
Messages: 14259
Registered: November 2005

Ultimate Member

mrjt wrote on Tue, 17 July 2007 11:10

		if (bufferdirty) {
			buffer.Create(GetView().Size());
			BufferPaint(buffer);
			bufferdirty = false;
		}
		buffer.Put(w, 0, 0);

buffer is a BackDraw object (I was going to use ImageDraw before I saw BackDraw). This seems to work OK, but is this the way to do it?

Cheers,
James

Yes, looks fine to me.

Mirek

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