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From: RWS@ZERMATT.LCS.MIT.EDU (Robert Scheifler)
Newsgroups: comp.windows.x
Subject: bitmaps and backgrounds
Message-ID: <871021150448.4.RWS@KILLINGTON.LCS.MIT.EDU>
Date: Wed, 21-Oct-87 15:04:00 EDT
Article-I.D.: KILLINGT.871021150448.4.RWS
Posted: Wed Oct 21 15:04:00 1987
Date-Received: Sat, 24-Oct-87 09:21:02 EDT
References: <885@godot.radonc.unc.edu>
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    Date: 21 Oct 87 13:51:50 GMT
    From: godot!sherouse@mcnc.org  (George W. Sherouse)

    In my fix to XMenu I used a loop over planes to XCopyPlane from the
    bitmap to the pixmap.  I am still not convinced that that is the best
    way to expand a bitmap

It certainly isn't.  One of the uses of CopyPlane is to fill a pixmap
from a bitmap in a single operation.  Perhaps the "exactly one plane"
sentence in the Xlib manual confused you.  The bit-plane you specify is
the source bit-plane, not the destination bit-plane.  (For a bitmap
there is only one plane to choose from, but CopyPlane is more general in
allowing you to select an arbitrary bit-plane from a multi-bit source.)
If you have a bitmap, and you want to fill a pixmap with a two-color
image of it, set the foreground/background in a GC to those two colors,
set the plane-mask to all ones, the function to Copy, and do a CopyPlane
with a bit-plane of 1.  No muss, no fuss.  (Alternatively you chould
store the bitmap as the stipple of the GC and use fill-style
OpaqueStippled in a FillRectangle, but that's more work.  Also
alternatively you could do a PutImage with format XYBitmap directly into
the pixmap, rather than creating the bitmap resource in between.  It
probably would be nice if Xlib had an XCreatePixmapFromBitmapData to
simplify this.)