Xref: utzoo comp.windows.x:35134 comp.windows.open-look:1180
Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!crdgw1!uunet!infonode!doyle
From: doyle@ingr.com (Doyle C. Davidson)
Newsgroups: comp.windows.x,comp.windows.open-look
Subject: Re: Clip Mask problem
Message-ID: <1991Apr10.214452.14674@infonode.ingr.com>
Date: 10 Apr 91 21:44:52 GMT
References: <6026@trantor.harris-atd.com>
Sender: doyle@infonode.ingr.com (Doyle Davidson)
Reply-To: ingr!doyle
Organization: Intergraph Corporation - Third Party Software
Lines: 32

In article <6026@trantor.harris-atd.com>, chuck@trantor.harris-atd.com (Chuck Musciano) writes:
>
>     Within XView, I have created a canvas, and I wish to render a number of
>small pixmaps in the canvas using clip masks.  I am also rendering some text
>next to each pixmap.  The net result is a file manager-like array of glyphs
>and names in a scrolling window.  I use clip masks to preserve the background
>color when drawing non-rectangular glyphs.
>
My method of drawing non-opaque pixmaps is:
    Create a bitmap with a bit set wherever there is a pixel set in the pixmap
    Fill the area non-opaquely with the bitmap pattern (don't forget
	pattern offsets) with foreground set to 0. (XCopyPlane)
    GXor in the pixmap (this requires that non-drawn pixel values of
    the pixmap be 0) with XCopyArea and Function = GXor.

This avoids any clip masks in the server, which as a former server
implementer, can be very abusive of the server.

Just my $0.02

Doyle
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