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Re: DirectColor on linux [message #18050 is a reply to message #17993]

Wed, 24 November 1999 00:00

Vincent Favre-Nicolin is currently offline

Vincent Favre-Nicolin
Messages: 8
Registered: November 1999

Junior Member

David Fanning wrote:

> Vincent Favre-Nicolin (favre@polycnrs-gre.fr) writes:
>
>> Well, I woul like very much not using XOR, but then
>> I would have to redisplay the image (they can be up to 5000x3500,float)
>> each time I add some text on it. A bit time and memory-consuming...
>
> Well, not really. With Device Copy you can repair just
> that portion of the window that you drew something on.
> That is usually an extremely small region (e.g., a
> selection box, maybe). This is absolutely lickity-split.
> It takes no time at all. Even on a 5000 x 3500 image. :-)

The problem is that I am working on X-Ray diffraction images, for which
I have to index each reflections, ie I must append a small box and three
integers to 50 to 300 dots on the image. These reflections do cover quite a
fair amount of the image, so that copying each small zone isn't very
convenient nor efficient in that case.
To produce readable text on the image, I have divided the private,
256-colors table in two halves, the lower being used to display the
diffracted intensities (grayscale), and the upper half of the color table is
a one-color zone, so that text written using XOR appears in that color. That
works, although I do not consider this very nice code. But I really cannot
keep a copy of all or parts of the image in this case.

Vincent

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[Message index]

		DirectColor on linux By: doosh on Mon, 22 November 1999 00:00
		Re: DirectColor on linux By: doosh on Wed, 24 November 1999 00:00
		Re: DirectColor on linux By: J.D. Smith on Wed, 24 November 1999 00:00
		Re: DirectColor on linux By: davidf on Wed, 24 November 1999 00:00
		Re: DirectColor on linux By: davidf on Wed, 24 November 1999 00:00
		Re: DirectColor on linux By: Vincent Favre-Nicolin on Wed, 24 November 1999 00:00
		Re: DirectColor on linux By: davidf on Tue, 23 November 1999 00:00
		Re: DirectColor on linux By: Vincent Favre-Nicolin on Tue, 23 November 1999 00:00
		Re: DirectColor on linux By: Vincent Favre-Nicolin on Tue, 23 November 1999 00:00
		Re: DirectColor on linux By: davidf on Tue, 23 November 1999 00:00
		Re: DirectColor on linux By: davidf on Tue, 23 November 1999 00:00

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