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Re: How to efficiently update a large Image? [message #22564 is a reply to message #22563]

Mon, 27 July 2009 13:39

mirek is currently offline

mirek
Messages: 14257
Registered: November 2005

Ultimate Member

Tom1 wrote on Mon, 27 July 2009 06:24

Hi,

I need to frequently update a small amount of pixels in a relatively large image (e.g. 1920x1200) and then draw the parts of image on screen. Unfortunately the following code is too slow:

ImageBuffer ib(image);
// .. here's the manipulation of the ib
image=ib;

Help, anybody?

The question is why it is slow...

The first thing to try is

ib.SetKind(....)

(I guess it will be ib.SetKind(IMAGE_OPAQUE)).

this would prevent optimization scan.

Just for better undestanding, what is slow here? Are we speaking about milliseconds or second?

Quote:

(I used to have my own graphics layer implemented for GDI and X11 but they just badly broke down due to the recent Draw virtualization.)

// Tom

In most cases, dynamic_cast<SystemDraw *> makes original code work just fine (SystemDraw has all interface and attributes of former Draw).

Mirek

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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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