NAME
	GU_TextWidth -- Calculate the pixel length of a text string.

   SYNOPSIS
	textwidth = GU_TextWidth(string, textattr)
	D0                       A0      A1

	ULONG GU_TextWidth(STRPTR, struct TextAttr *);

   FUNCTION
	Calculate the length of the text, using the specified font. This
	function will open the required font, if it isn't opened before.

   INPUTS
	string - NULL terminated text to calculate width of.

	textattr - a filled in TextAttr structure.

   RESULT
	textwidth - pixel length of the text

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Converted on 19 Jul 1996 with RexxDoesAmigaGuide2HTML by Michael Ranner.