Peter Harris wrote:
> > but xlib doesnt support an alpha channel (and the freerunner has only 16
> > bits per pixel). is there an easy way to do transparency (one
> > transparent color is enough) with xlib or a toolkit which builds on it?
>
> If you can easily extract that color into a 1-bit bitmap, you can use
> XSetClipMask.
Alternatively, you can do it in two steps:
XSetFunction(dpy, gc, GXandInverted);
XSetBackground(dpy, gc, 0UL);
XSetForeground(dpy, gc, ~0UL);
XCopyPlane(dpy, mask, win, gc, ..., 1UL);
XSetFunction(dpy, gc, GXor);
XCopyArea(dpy, image, win, gc, ...);
The image must have all background (transparent) pixels set to zero.
Also, you can use XPutImage() instead of XCopyPlane() and XCopyArea().
--
Glynn Clements <gl...@gclements.plus.com>
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