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From: [e-mail] (Andre Beck)
Newsgroups: comp.windows.x
Subject: Re: Drawing colour pixmaps - not rectangular
Date: 6 Apr 1993 14:43:59 GMT
Organization: Dept. of Computer Science, TU Dresden, Germany.
Lines: 27
Distribution: world
Message-ID: <1ps4vf$[e-mail]>
References: <[e-mail]>
Reply-To: [e-mail]
NNTP-Posting-Host: irzr17.inf.tu-dresden.de


In article <[e-mail]>, [e-mail] (Justin Kibell) writes:

|>   I am writing a program which needs to draw colour XPM pixmap files onto a background without having the borders show up. I cannot do xor as the colours all stuff up. I cannot use XCopyPlane() as that is for single planes only. I want to be able to specify a colour in the pixmap to be used as the opaque colour. Is this possible. 
|> 
|> Games such as xjewel have the same problem. How does the mouse pointer do it?
|> 
|> Any help would be helpful? :-)
|> 

You wanna do masking. Build a bitmap (pixmap of depth one) where all pixels
you name "opaque" are 1 (that get copied) and the others are 0. Use this
bitmap as the clip_mask in the gc used for XCopyArea(), and remember to
adjust the clip_origin coordinates to the XCopyArea() blit origin.

The Mouse pointer (besides from that it is driven using RAMDAC analog
mapping on most hardwares) uses a mask, too.

But be warned: blitting through a mask and especially moving around this mask
is annoying slow on most xservers... it flickers even at 40 MIPS...

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