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From: mouse@lightning.mcrcim.mcgill.EDU (der Mouse)
Newsgroups: comp.windows.x
Subject: Re:  XCreatePixmapFromBitmapData (was: white and black ..)
Message-ID: <9106091743.AA01216@lightning.McRCIM.McGill.EDU>
Date: 9 Jun 91 17:43:07 GMT
Sender: daemon@athena.mit.edu (Mr Background)
Organization: The Internet
Lines: 55

> one more problem about black and white, this time not in the server
> but with XCreatePixmapFromBitmapData.

> A few days ago someone posted the following small program to this
> group (it was something about twm and free-ing), and as it is so
> small, I will misuse it to demonstrate my problem:

> On Sun4, X11R4 (MIT), SunOS4.1.1, awm, I get
> black: 1; white: 0
> and the icon is a black smiley on white.

> On my NCD X-Terminal (program running on the same Sun as above), I get
> black: 0; white: 1
> and the icon is a white smiley on black.

> Of course the servers are free to code black/white by any number they
> like, so I don't mind black: 1 vs. black: 0, but where is the moment
> in the program when I use hard coded 0/1 as black/white for the icon
> pixmap and especially: how do I do it right?

Your basic problem is that you don't quite know how icon pixmaps work.
First of all, they aren't, as the name implies, truly icon pixmaps;
they're really icon bitmaps.  The ICCCM says, in 4.1.2.4 (discussing
the WM_HINTS property),

	The icon_pixmap field may specify a pixmap to be used as an
	icon.  This pixmap should be:
	
	o One of the sizes specified in the WM_ICON_SIZE property on
	  the root, if it exists (see Section 4.1.3.2).
	
	o 1-bit deep.  The window manager will select, through the
	  defaults database, suitable background (for the 0 bits) and
	  foreground (for the 1 bits) colors.  These defaults can, of
	  course, specify different colors for the icons of different
	  clients.

So, if you change the following

	icon_pix = XCreatePixmapFromBitmapData(disp,RootWindow(disp,scrn),
		icon_bits,icon_width,icon_height,BlackPixel(disp,scrn),
		WhitePixel(disp,scrn),DefaultDepth(disp,scrn));

so that it reads

	icon_pix = XCreatePixmapFromBitmapData(disp,RootWindow(disp,scrn),
		icon_bits,icon_width,icon_height,0L,1L,1);

you should get more consistent results.  (The depth change is necessary
to make the code work on non-1-bit displays.)

					der Mouse

			old: mcgill-vision!mouse
			new: mouse@larry.mcrcim.mcgill.edu