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Re: How to efficiently update a large Image? [message #22566 is a reply to message #22564]

Mon, 27 July 2009 16:47

Tom1
Messages: 1303
Registered: March 2007

Ultimate Contributor

Hi Mirek,

SetKind(IMAGE_OPAQUE) gives marginal improvement.

Now I see the visit from Image to ImageBuffer and back to Image does not take more than about 1.5 ms. However, after this visit the DrawImage does something more than usual and becomes slow. It takes about 30 ms to update a small stripe of an image using DrawImage whereas without the ImageBuffer visit, this takes less than a millisecond.

I also noticed that the application allocates and deallocates several megabytes worth of memory when running probably because of what is happening around this image or imagebuffer.

--

Is there any way to directly update the Image pixel contents without ImageBuffer and the associated DrawImage overhead?

(I need to get familiar with the dynamic_cast thing soon... It was not quite as easy as I had hoped it would be.)

Thanks,

Tom

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[Message index]

		How to efficiently update a large Image? By: Tom1 on Mon, 27 July 2009 12:24
		Re: How to efficiently update a large Image? By: mirek on Mon, 27 July 2009 13:39
		Re: How to efficiently update a large Image? By: Tom1 on Mon, 27 July 2009 16:47
		Re: How to efficiently update a large Image? By: mirek on Mon, 27 July 2009 17:15
		Re: How to efficiently update a large Image? By: mirek on Mon, 27 July 2009 17:18
		Re: How to efficiently update a large Image? By: Tom1 on Tue, 28 July 2009 11:16
		Re: How to efficiently update a large Image? By: mirek on Tue, 28 July 2009 16:29
		Re: How to efficiently update a large Image? By: mirek on Tue, 28 July 2009 16:32
		Re: How to efficiently update a large Image? By: Tom1 on Wed, 29 July 2009 09:18
		Re: How to efficiently update a large Image? By: mirek on Sun, 02 August 2009 15:11
		Re: How to efficiently update a large Image? By: Tom1 on Wed, 26 August 2009 07:57
		Re: How to efficiently update a large Image? By: mirek on Fri, 28 August 2009 00:24
		Re: How to efficiently update a large Image? By: Tom1 on Tue, 01 September 2009 08:24
		Re: How to efficiently update a large Image? By: mirek on Wed, 02 September 2009 11:37
		Re: How to efficiently update a large Image? By: Tom1 on Thu, 03 September 2009 11:45

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