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Re: XBM images sometimes inverted on Windows

From: Jason Rumney
Subject: Re: XBM images sometimes inverted on Windows
Date: Sat, 01 Dec 2007 13:36:42 +0000
User-agent: Thunderbird (Windows/20071031)

Neil Roberts wrote:
> Hi,
> I've noticed that when running Emacs under Windows, if you create an
> XBM image where the :data keyword is set to a string containing the
> actual bits of the bitmap then the foreground and background colours
> are swapped. 
> (defconst smiley-data '(#x00 #x00 #x24 #x00 #x00 #x24 #x18 #x00))
> (defun smiley-from-xbm-bytes ()
>   ;; Make an image using the bytes directly in a string
>   (list 'image :type 'xbm :ascent 100 :width 8 :height 8
>       :data (apply 'string smiley-data)))

Does this result in a valid xbm image? There is no width and height
specified, and the data is not in the textual format that an xbm is
supposed to be in.

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