Drawing to the screen itself via GTK

Kibokun · 06-10-09, 10:12 AM

I'm trying to figure out a way using GTK+ (or any GNOME windowing toolkit module) to draw directly to the screen, not bound by a widget. For the simplest of effects, I just want to make the entire screen flash red and fade back to a normal R value, but I don't quite understand what I'd need to use to do this as all the drawing functions I've found have been for drawing to a drawable object. Any information / guides / tips would be helpful. I'm writing this in C, by the way.

Thanks!

Chris_F · 06-10-09, 02:52 PM

Quote:

Originally Posted by Kibokun

I'm trying to figure out a way using GTK+ (or any GNOME windowing toolkit module) to draw directly to the screen, not bound by a widget. For the simplest of effects, I just want to make the entire screen flash red and fade back to a normal R value, but I don't quite understand what I'd need to use to do this as all the drawing functions I've found have been for drawing to a drawable object. Any information / guides / tips would be helpful. I'm writing this in C, by the way.

Thanks!

You mean draw to the entire screen and not just your application window? Can't be done like that. You either need your program window to fill up the entire screen, or you need to use X to write directly to the screen buffer.

Kibokun · 06-10-09, 03:34 PM

hmm, that's annoying. My team doesn't really have time to learn Xlib for this project. Does GDK offer any sort of medium between xlib and GTK? I've been reading up on GDKScreens and modifying ColorMaps, but I don't know if this is the way it should be done.

A compromise we've been talking about is making a GTK widget that isn't attached to a window somehow. Or maybe making a GTK window that's transparent so only things drawn to it appear? I will have to fiddle I guess.

Thanks!

JigPu · 06-10-09, 04:00 PM

I haven't done any GTK programming, but I'd imagine all widgets have to be attached to a window. What I think I'd do in your situation (again, without having done any GTK before) is to create a new window just for this effect. This new window would be set to have no decoration (title bar, minimize/restore/close buttons, etc) and fill the screen. Then draw either directly to the window or to a widget filling the window.

A window without decoration looks like nothing more than the widget contained (or background graphics if you can directly draw to a window) and should work well unless you're planning on doing something more complex...

JigPu

ShadowPho · 06-11-09, 12:37 AM

A dirty hack: an openGL program that runs in the background, receives a signal, creates a fullscreen window on the fly, maximizes and then self destructs.

06-10-09, 10:12 AM	Thread Starter #1
Kibokun Member Join Date: Mar 2006	Drawing to the screen itself via GTK I'm trying to figure out a way using GTK+ (or any GNOME windowing toolkit module) to draw directly to the screen, not bound by a widget. For the simplest of effects, I just want to make the entire screen flash red and fade back to a normal R value, but I don't quite understand what I'd need to use to do this as all the drawing functions I've found have been for drawing to a drawable object. Any information / guides / tips would be helpful. I'm writing this in C, by the way. Thanks! __________________ Asus P8P67 PRO Rev 3.0 Corsair 650TX 650W PSU Intel Core i5-2500k Sapphire Radeon 7850 8GB Corsair Vengeance 1600Mhz Raidmax Smilodon WD Caviar 500GB HP 2311Xi
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06-10-09, 03:34 PM	Thread Starter #3
Kibokun Member Join Date: Mar 2006	hmm, that's annoying. My team doesn't really have time to learn Xlib for this project. Does GDK offer any sort of medium between xlib and GTK? I've been reading up on GDKScreens and modifying ColorMaps, but I don't know if this is the way it should be done. A compromise we've been talking about is making a GTK widget that isn't attached to a window somehow. Or maybe making a GTK window that's transparent so only things drawn to it appear? I will have to fiddle I guess. Thanks! __________________ Asus P8P67 PRO Rev 3.0 Corsair 650TX 650W PSU Intel Core i5-2500k Sapphire Radeon 7850 8GB Corsair Vengeance 1600Mhz Raidmax Smilodon WD Caviar 500GB HP 2311Xi
	QUOTE Thanks

06-10-09, 04:00 PM	#4
JigPu Inactive Pokémon Moderator Join Date: Jun 2001 Location: Vancouver, WA	I haven't done any GTK programming, but I'd imagine all widgets have to be attached to a window. What I think I'd do in your situation (again, without having done any GTK before) is to create a new window just for this effect. This new window would be set to have no decoration (title bar, minimize/restore/close buttons, etc) and fill the screen. Then draw either directly to the window or to a widget filling the window. A window without decoration looks like nothing more than the widget contained (or background graphics if you can directly draw to a window) and should work well unless you're planning on doing something more complex... JigPu __________________ .... ASRock Z68 Extreme3 Gen3 .... Intel Core i5 2500 ........................ 4 thread ...... 3300 MHz ......... -0.125 V 2x ASUS GTX 560 Ti ............................... 1 GiB ....... 830 MHz ...... 2004 MHz .... G.SKILL Sniper Low Voltage ............. 8 GiB ..... 1600 MHz ............ 1.25 V .... OCZ Vertex 3 ................................. 120 GB ............. nilfs2 ..... Arch Linux .... Kingwin LZP-550 .............................. 550 W ........ 94% Eff. ....... 80+ Plat .... Nocuta NH-D14 ................................ 20 dB ..... 0.35 C°/W ................ 7 V "In order to combat power supply concerns, Nvidia has declared that G80 will be the first graphics card in the world to run entirely off of the souls of dead babies. This will make running the G80 much cheaper for the average end user." "GeForce 8 Series." Wikipedia, The Free Encyclopedia. 7 Aug 2006, 20:59 UTC. Wikimedia Foundation, Inc. 8 Aug 2006.
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06-11-09, 12:37 AM	#5
ShadowPho Member Join Date: Jun 2005 Location: I am in your stack, SUBbing your registers!	A dirty hack: an openGL program that runs in the background, receives a signal, creates a fullscreen window on the fly, maximizes and then self destructs. __________________ "Take only that which you can give" Need Help? IM me! I want to help the OC community! MainComputer: E6400@2.69-4.0 gig RAM-8800GT ASUS P5N-E SLI
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