Re: reading / writing the color of an absolute pixel (x,y) of the physical screen

From	Soviet_Mario <SovietMario@CCCP.MIR>
Newsgroups	alt.os.linux
Subject	Re: reading / writing the color of an absolute pixel (x,y) of the physical screen
Date	2019-06-26 12:49 +0200
Organization	A noiseless patient Spider
Message-ID	<qevik2$u2p$1@dont-email.me> (permalink)
References	<qetg1o$euc$1@dont-email.me>

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On 25/06/19 17:53, Soviet_Mario wrote:
> 

addendum ...

In the "A beginners guide to Gambas" I found an example on 
pag 288 that I had not been able to replicate, using a
Desktop.Grab () method  as this seemed "discontinued" (the 
guide is a 2005 document and Gambas was at earlier versions)

Well ... I feel rather dumb (or numb ?), oh, "stupid" ... 
the method maybe was just RENAMED. Exploring the object with 
"intellisense" (or whatever the name is used in Linux for 
context aware inspection), I discovered a
"Screenshot (XLeft, Ytop, Width, Height)" method returning a 
readonly Picture object.

Now I'm gonna test it. If it works, maybe the need to act on 
physical screen directly disappears, and I would be glad to 
manage to do all the work INSIDE gambas itself.

I had headaches at the very thought of DEBUGGING a piece of 
code calling external libraries with the internal debugger, 
which is fast and handy but not exactly GDB !

ciao e grazie
(cheers and thanks for help)


> It might be one of the lowest level "API" of Xwindows or 
> other window manager.
> 
> Can anybody tell me which Libraries to rely on and some 
> synthax to invoke those methods in user code ?
> 
> I suspect Xwindows code source is simply TOO HUGE for me to 
> sieve it and just get out this couple of lowest level 
> functions (and eventual dependencies).
> 
> Maybe I do not even understand the possible risks, as in 
> this topic I still think in term of aged windows versions 
> (there I had to ask for SCREEN handle, then declare the API, 
> invoke API, and resident apis, no need to load anything 
> else, and understand the data type in/out and the _CDECL 
> declspec for ordering of parameters and stack cleanup C-like)
> 
> now Linux is native in C, so I won't have problems in 
> understanding the exchange requirements .... but I 
> completely ignore for example if I would have the RIGHTS 
> (privilege) to invoke function from loaded external 
> libraries and services ... particularly when writing the 
> screen is concerned I'd could possibly mess up other 
> windows, even if temporarily).
> 
> Some reading for suggestion ?
> 
> NOTICE : I do not need a complete program to pickup colors 
> and draw, as it would be amazingly slow. I need to directly 
> call lowest level functions just in use of the graphical 
> system running (which I suppose to be very fast)
> 
> TY
> 


-- 
1) Resistere, resistere, resistere.
2) Se tutti pagano le tasse, le tasse le pagano tutti
Soviet_Mario - (aka Gatto_Vizzato)

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reading / writing the color of an absolute pixel (x,y) of the physical screen Soviet_Mario <SovietMario@CCCP.MIR> - 2019-06-25 17:53 +0200
  Re: reading / writing the color of an absolute pixel (x,y) of the physical screen Alfonso P Cutaway <dweed54@gmail.com> - 2019-06-25 16:01 +0000
    Re: reading / writing the color of an absolute pixel (x,y) of the physical screen "R.Wieser" <address@not.available> - 2019-06-25 19:03 +0200
      Re: reading / writing the color of an absolute pixel (x,y) of the physical screen Alfonso P Cutaway <dweed54@gmail.com> - 2019-06-25 18:08 +0000
        Re: reading / writing the color of an absolute pixel (x,y) of the physical screen "R.Wieser" <address@not.available> - 2019-06-25 21:44 +0200
          Re: reading / writing the color of an absolute pixel (x,y) of the physical screen Alfonso P Cutaway <dweed54@gmail.com> - 2019-06-26 00:37 +0000
            Re: reading / writing the color of an absolute pixel (x,y) of the physical screen "R.Wieser" <address@not.available> - 2019-06-26 10:50 +0200
              Re: reading / writing the color of an absolute pixel (x,y) of the physical screen Alfonso P Cutaway <dweed54@gmail.com> - 2019-06-26 19:43 +0000
                Re: reading / writing the color of an absolute pixel (x,y) of the physical screen "Carlos E.R." <robin_listas@es.invalid> - 2019-06-26 22:37 +0200
                Re: reading / writing the color of an absolute pixel (x,y) of the physical screen Alfonso P Cutaway <dweed54@gmail.com> - 2019-06-26 20:55 +0000
                Re: reading / writing the color of an absolute pixel (x,y) of the physical screen "Carlos E.R." <robin_listas@es.invalid> - 2019-06-26 23:29 +0200
                Re: reading / writing the color of an absolute pixel (x,y) of the physical screen Aragorn <thorongil@telenet.be> - 2019-06-26 23:50 +0200
                Re: reading / writing the color of an absolute pixel (x,y) of the physical screen Alfonso P Cutaway <dweed54@gmail.com> - 2019-06-26 22:50 +0000
                Re: reading / writing the color of an absolute pixel (x,y) of the physical screen DecadentLinuxUserNumeroUno@decadence.org - 2019-06-28 12:50 +0000
                Re: reading / writing the color of an absolute pixel (x,y) of the physical screen DecadentLinuxUserNumeroUno@decadence.org - 2019-06-28 12:56 +0000
                Re: reading / writing the color of an absolute pixel (x,y) of the physical screen "R.Wieser" <address@not.available> - 2019-06-27 11:10 +0200
                Re: reading / writing the color of an absolute pixel (x,y) of the physical screen Soviet_Mario <SovietMario@CCCP.MIR> - 2019-06-27 12:39 +0200
                Re: reading / writing the color of an absolute pixel (x,y) of the physical screen "R.Wieser" <address@not.available> - 2019-06-27 14:43 +0200
                Re: reading / writing the color of an absolute pixel (x,y) of the physical screen Soviet_Mario <SovietMario@CCCP.MIR> - 2019-06-27 15:57 +0200
        Re: reading / writing the color of an absolute pixel (x,y) of the physical screen Soviet_Mario <SovietMario@CCCP.MIR> - 2019-06-26 01:03 +0200
          Re: reading / writing the color of an absolute pixel (x,y) of the physical screen Alfonso P Cutaway <dweed54@gmail.com> - 2019-06-26 00:38 +0000
  Re: reading / writing the color of an absolute pixel (x,y) of the physical screen Wildman <best_lay@yahoo.com> - 2019-06-25 11:18 -0500
    Re: reading / writing the color of an absolute pixel (x,y) of the physical screen Soviet_Mario <SovietMario@CCCP.MIR> - 2019-06-26 01:02 +0200
      Re: reading / writing the color of an absolute pixel (x,y) of the physical screen Aragorn <thorongil@telenet.be> - 2019-06-26 01:08 +0200
  Re: reading / writing the color of an absolute pixel (x,y) of the physical screen Bit Twister <BitTwister@mouse-potato.com> - 2019-06-25 11:48 -0500
  Re: reading / writing the color of an absolute pixel (x,y) of the physical screen Paul <nospam@needed.invalid> - 2019-06-25 16:14 -0400
    Re: reading / writing the color of an absolute pixel (x,y) of the physical screen Soviet_Mario <SovietMario@CCCP.MIR> - 2019-06-26 01:13 +0200
      Re: reading / writing the color of an absolute pixel (x,y) of the physical screen "F. Russell" <fr@random.info> - 2019-06-26 08:37 +0000
        Re: reading / writing the color of an absolute pixel (x,y) of the physical screen Soviet_Mario <SovietMario@CCCP.MIR> - 2019-06-26 12:29 +0200
          Re: reading / writing the color of an absolute pixel (x,y) of the physical screen Bit Twister <BitTwister@mouse-potato.com> - 2019-06-26 06:55 -0500
          Re: reading / writing the color of an absolute pixel (x,y) of the physical screen "F. Russell" <frussell@random.info> - 2019-06-26 12:15 +0000
          Re: reading / writing the color of an absolute pixel (x,y) of the physical screen owl <owl@rooftop.invalid> - 2019-06-26 12:35 +0000
            Re: reading / writing the color of an absolute pixel (x,y) of the physical screen Soviet_Mario <SovietMario@CCCP.MIR> - 2019-06-26 15:44 +0200
              Re: reading / writing the color of an absolute pixel (x,y) of the physical screen owl <owl@rooftop.invalid> - 2019-06-26 14:00 +0000
                Re: reading / writing the color of an absolute pixel (x,y) of the physical screen Soviet_Mario <SovietMario@CCCP.MIR> - 2019-06-26 21:01 +0200
                Re: reading / writing the color of an absolute pixel (x,y) of the physical screen owl <owl@rooftop.invalid> - 2019-06-26 23:05 +0000
                Re: reading / writing the color of an absolute pixel (x,y) of the physical screen Soviet_Mario <SovietMario@CCCP.MIR> - 2019-06-27 12:27 +0200
                Re: reading / writing the color of an absolute pixel (x,y) of the physical screen owl <owl@rooftop.invalid> - 2019-06-27 13:53 +0000
  Re: reading / writing the color of an absolute pixel (x,y) of the physical screen Jasen Betts <jasen@xnet.co.nz> - 2019-06-26 10:13 +0000
  Re: reading / writing the color of an absolute pixel (x,y) of the physical screen Soviet_Mario <SovietMario@CCCP.MIR> - 2019-06-26 12:49 +0200

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