Path: utzoo!mnetor!uunet!husc6!m2c!ulowell!apollo!oj
From: oj@apollo.uucp (Ellis Oliver Jones)
Newsgroups: comp.windows.x
Subject: Re: XCreateBitmapFromData() bug/feature question
Message-ID: <3a1c5230.d5b2@apollo.uucp>
Date: 6 Feb 88 00:35:00 GMT
References: <8802042049.AA06105@amadeus.silvlis.com> <10572@jade.BBN.COM>
Reply-To: oj@apollo.UUCP (Ellis Oliver Jones)
Organization: Apollo Computer, Chelmsford, MA
Lines: 28

Matt Landau's answer to Mark Baushke was right on:
>>I have a sequential stream of bytes which I want to make into an icon.
>>On my Sun, I need to 'swap' the bytes on each 'short' word in order to
>>make the image look correct....

>One portable way of doing this is to use XCreateImage to make an
>XImage structure

But all you *really* need to do is declare a local
XImage structure and initialize the proper fields.  You
can code this up in C so it will work the same on a VAX and a Motorola processor:

 XImage myim;

 myim.format = XYBitmap;    /* causes XCopyPlane behavior on XPutImage */
 myim.data   = @pointer to your own data@;
 myim.width  = @width of data in pixels@;
 myim.height = @height in pixels@;
 myim.bytes_per_line = @whatever the bitmap pitch is@;
 myim.bitmap_unit = 16;  /* short word bitmap */
 myim.bitmap_bit_order = MSBFirst;   /* same for 680x0 and VAX, but depends on frame buffer */
 myim.byte_order = LSBFirst;         /* this is "natural" for a VAX */
 myim.bitmap_pad = @whatever comes at the ends of lines @;
 myim.xoffset = 0;   /*probably*/
 myim.depth = 1;     /* the depth*/
 XPutImage ( dpy, drawable, gc, &myim, srcx, srcy, dstx, dsty, @width@, @height@);

Have fun!  /oj