Maemo 5 Portrait mode Xlib application porting - maemo.org

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brad112358	2010-01-06 , 04:56
Posts: 37 \| Thanked: 54 times \| Joined on Dec 2009	#1

Can someone please give me some hints on the best way to handle porting a simple old-fashioned X11 application which currently relies only on Xlib? I have it mostly working in landscape mode on the N900, but the application fits much better in portrait mode.

Does hildon_gtk_window_set_portrait_flags ultimately use the X RandR extension, or is it doing something else? I guess I can link in libhildon, and enough of libgtk and friends to make it happy, but will I also have to rotate my objects and bitmaps? Or will I then be presented with a 480x800 display rather than the normal 800x480 display (which would be the case if it uses the RandR to rotate the screen)?

I found some statements implying that application screen rotation might be handled via the X RandR extension on the N900, but nothing that looked authoritative.

I'd just look at the source, but, it seems that source isn't available for libhildon? (Why???!!!)

Thanks for any clues.

--Brad

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	tuminoid	2010-01-06 , 05:42
	Posts: 188 \| Thanked: 185 times \| Joined on Dec 2009 @ Finland	#2

I'm not sure about the technology behind the feature (I try to steer myself clear of pure X, et al), but AFAIK you are presented with 480*800 screen when in portrait mode. You also don't need to link against hildon I think, since it looks like window property being set via some atom.

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	qwerty12	2010-01-06 , 07:39
	Posts: 4,274 \| Thanked: 5,358 times \| Joined on Sep 2007 @ Looking at y'all and sighing	#3

Two atoms: _HILDON_PORTRAIT_MODE_SUPPORT and _HILDON_PORTRAIT_MODE_REQUEST. Both are of the type XA_CARDINAL, both should be set to 1 and they both should be viewed as 32-bit.

libhildon is open; the bleeding-edge stuff is to be found on maemo.gitorious.org. But as I'm typing this from bed, I'm reluctant to find the link.

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brad112358	2010-01-09 , 20:06
Posts: 37 \| Thanked: 54 times \| Joined on Dec 2009	#4

Thanks for the help!

Just in case anyone else needs to do full screen portrait mode at the X11 (libX11) level, the following code is what I ended up with. After I got it working, I checked with xrandr via ssh and the debian chroot, and the window manager is indeed rotating the entire screen using the X RandR extension under the covers.

--Brad

#include <X11/Xatom.h>

long on = 1;

/* Rotate window into portrat mode and make fullscreen */

XChangeProperty(dpy, mainW, XInternAtom(dpy, "_HILDON_PORTRAIT_MODE_SUPPORT", True), XA_CARDINAL, 32, PropModeReplace, (unsigned char *) &on, 1);

XChangeProperty(dpy, mainW, XInternAtom(dpy, "_HILDON_PORTRAIT_MODE_REQUEST", True), XA_CARDINAL, 32, PropModeReplace, (unsigned char *) &on, 1);

Atom newstate = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", True);
XChangeProperty(dpy, mainW, XInternAtom(dpy, "_NET_WM_STATE", True), XA_ATOM, 32, PropModeReplace, (unsigned char *) &newstate, 1);

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	too	2010-01-26 , 14:21
	Posts: 122 \| Thanked: 135 times \| Joined on Dec 2009 @ Helsinki	#5

Thanks

complete function which does this:

Code:

#include <X11/Xlib.h>
#include <X11/Xatom.h>

/* Rotate window into portrat mode and make fullscreen */

void portraitmode(Window win)
{
    unsigned char on = 1;
    Display * dpy = XOpenDisplay(0/*null*/);/* or use toolkit's dpy variable */
    Atom newstate;

    XChangeProperty(dpy, win,
		    XInternAtom(dpy, "_HILDON_PORTRAIT_MODE_SUPPORT", True),
		    XA_CARDINAL, 32, PropModeReplace, &on, 1);

    XChangeProperty(dpy, win,
		    XInternAtom(dpy, "_HILDON_PORTRAIT_MODE_REQUEST", True),
		    XA_CARDINAL, 32, PropModeReplace, &on, 1);

    newstate = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", True);
    XChangeProperty(dpy, win,
		    XInternAtom(dpy, "_NET_WM_STATE", True), XA_ATOM, 32,
		    PropModeReplace, (unsigned char *) &newstate, 1);
}

and, parts from gtk program

Code:

#include <gdk/gdkx.h>
...
GtkWidget * mainwin = hildon_stackable_window_new();
...
gtk_widget_show_all (mainwin);
portraitmode(GDK_WINDOW_XID(mainwin->window));

gtk_main();

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	qwerty12	2010-01-26 , 14:29
	Posts: 4,274 \| Thanked: 5,358 times \| Joined on Sep 2007 @ Looking at y'all and sighing	#6

Originally Posted by too

Thanks

complete function which does this:

Code:

#include <X11/Xlib.h>
#include <X11/Xatom.h>

/* Rotate window into portrat mode and make fullscreen */

void portraitmode(Window win)
{
    unsigned char on = 1;
    Display * dpy = XOpenDisplay(0/*null*/);/* or use toolkit's dpy variable */
    Atom newstate;

    XChangeProperty(dpy, win,
		    XInternAtom(dpy, "_HILDON_PORTRAIT_MODE_SUPPORT", True),
		    XA_CARDINAL, 32, PropModeReplace, &on, 1);

    XChangeProperty(dpy, win,
		    XInternAtom(dpy, "_HILDON_PORTRAIT_MODE_REQUEST", True),
		    XA_CARDINAL, 32, PropModeReplace, &on, 1);

    newstate = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", True);
    XChangeProperty(dpy, win,
		    XInternAtom(dpy, "_NET_WM_STATE", True), XA_ATOM, 32,
		    PropModeReplace, (unsigned char *) &newstate, 1);
}

and, parts from gtk program

Code:

#include <gdk/gdkx.h>
...
GtkWidget * mainwin = hildon_stackable_window_new();
...
gtk_widget_show_all (mainwin);
portraitmode(GDK_WINDOW_XID(mainwin->window));

gtk_main();

If this is for a GTK+ application, why not just use hildon_gtk_window_set_portrait_flags()?

http://wiki.maemo.org/Using_Fremantl...creen_Rotation explains it quite well.

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	too	2010-01-27 , 07:51
	Posts: 122 \| Thanked: 135 times \| Joined on Dec 2009 @ Helsinki	#7

Originally Posted by qwerty12

If this is for a GTK+ application, why not just use hildon_gtk_window_set_portrait_flags()?

http://wiki.maemo.org/Using_Fremantl...creen_Rotation explains it quite well.

Because I did not find that; I spent quite a while searching
for this information and could not get anything that this

Now the above is replaced with:

Code:

    hildon_gtk_window_set_portrait_flags(GTK_WINDOW (mainwin),
					HILDON_PORTRAIT_MODE_REQUEST);

The call gtk_window_fullscreen (GTK_WINDOW (mainwin));
makes title bar vanish, which I did not want, so not called

(The_NET_WM_STATE_FULLSCREEN in my code above does not do this)

Last edited by too; 2010-01-29 at 08:34.

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