🚀 go-pugleaf

In article <sara70.259> you write:
>This example causes "System error 02", Address error.
>It appears CopyBits cannot copy from a BitImage with
>rowBytes=1. When I changed my BitImage to 16*8 pixels,
>rowBytes=2, everything functioned ok. 
>
>Does anyone know where the problem is, with me or with
>QuickDraw??

The problem is that rowBytes *must* be an even number
remember that the bus is 16bits and it would be *higly*
ineficient to manipulate a byte at a time.

To quote the Inside Macintosh (QuickDraw; page 12):

	The baseAddr field is a pointer to the begining of the
	the bit image in memory and the rowBytes field is the
	number of bytes in each row of the image.  Both of these
	should always be even: a bitMap should always begin on
	a word boundary and contain an integral number of words
	in each row.

_________________________Computare necesse est!______________________

	Johan Strandberg
	Apple Computer Education Research Group [ERG]
	{mtxinu,dual,nsc,voder,idi,ios,sun}!apple!johan