Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!mcsun!ukc!icdoc!sot-ecs!M.R.Dobie
From: M.R.Dobie@ecs.soton.ac.uk
Newsgroups: comp.windows.open-look
Subject: Xview icon question (how to invert one)
Message-ID: <8356.9012111640@hilliard.ecs.soton.ac.uk>
Date: 11 Dec 90 16:40:29 GMT
Sender: mrd@ecs.soton.ac.uk
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 I am new to Xview, so if I have missed anything obvious, flame away :-)
 
 OK, here's the problem.
 
 I have an icon which I want to load in from an icon file at run time,
 so I use the icon_load function (which is in the SunView manual but
 also in the xview include files so I thought it would be OK).
 
 Anyway, it all works fine.
 
 Then I want to invert the icon (black to white, not upside down :-|)
 Somewhere in O'Reilly volume 7 I read that I should use all the X
 graphics calls, so I read about Pixmaps and graphics contexts and
 XCopyArea to do the inversion.
 
 To get a Pixmap I got the ICON_IMAGE from the icon to give me a
 Server_image. Then I tried to get the SERVER_IMAGE_PIXMAP from the
 Server_image to give me a Pixmap to invert. This is where it goes
 wrong.
 
 Whenever I try to get some attribute of the Server_image I get an
 error,
 
 XView warning: Object 0xdc40, invalid object (embedding seal incorrect), xv_get
 
 Several thoughts occured to me. Can you only get a Server_image from
 an icon if it was created with a Server_image? Is icon_load the wrong
 thing to use? I tried my code in different parts of the program
 (before xv_main_loop and in an event procedure).
 
 Does anyone know what the matter is?
  
 -- 
 
 				Mark