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From: west@gsrc.dec.com (Jim West (Stealth Contractor))
Newsgroups: comp.windows.x
Subject: Re: How to copy from depth 1 to depth n
Message-ID: <1472@shodha.dec.com>
Date: 25 Jul 90 15:26:22 GMT
Sender: news@shodha.dec.com
Organization: Digital Equipment Corporation
Lines: 60


In article <114409@linus.mitre.org>, dsr@luke.mitre.org (Douglas S. Rand) writes...
>I'm a little stuck.  I can create a pixmap from a bitmap file
>with XReadBitmapData.  Great.  Now what do I do to create
>a pixmap with the same depth as my display but with the same
>bitmap data?  What I don't want to do (and the only alternative I 
>see) is to do a XGetImage and XGetPixel along with a separate
>XCreatePixmap (right depth).  Will someone please tell me
>I'm wrong (but be right about it OK? :) .
> 
>Douglas S. Rand 
>Internet:   <dsrand@mitre.org>
>Snail:	    MITRE, Burlington Road, Bedford, MA 
>Disclaimer: MITRE might agree with me - then again...
>Amateur Radio: KC1KJ

  The following code bits are in Ada but I think you'll get the idea.


  x.read_bitmap_file (
    status		=> status,
    display		=> display,
    drawable_id		=> root,
    file_name		=> file_name (1 .. file_name_len),
    width_return	=> width,
    height_return	=> height,
    bitmap_id_return	=> bitmap_id,
    x_hot_coord_return	=> hot_x,
    y_hot_coord_return	=> hot_y);

  x.create_pixmap (
    result	=> pixmap_id,
    display	=> display,
    drawable_id	=> root,
    width	=> width,
    height	=> height,
    depth	=> depth); -- default depth of screen

  x.copy_plane (
    display	    => display,
    src_drawable_id => bitmap_id,
    dst_drawable_id => pixmap_id,
    gc_id	    => gc,
    src_x_coord	    => 0,
    src_y_coord	    => 0,
    width	    => width,
    height	    => height,
    dst_x_coord	    => 0,
    dst_y_coord	    => 0,
    plane	    => 1); -- Here is where the magic is


----------------------------------------------------------------------
 Jim West                      |  The Schainker Converse
 west@gsrc.dec.com             |  to Hoare's Law :
                               |
 These are my opinions.        |   Inside every small problem
 Digital has no idea           |     is a larger problem struggling
 what I'm  saying.             |       to get out.
----------------------------------------------------------------------