[softwarelist] Re: PostScript problem with complex border definitions RISC OS
- From: David Pilling <flist@xxxxxxxxxxxxxxxxxxx>
- To: davidpilling@xxxxxxxxxxxxx
- Date: Wed, 21 Jul 2010 13:55:45 +0100
Hi,
A thought on borders
The problem border was a line of form
Line m 0x92492492 0x1400 0x0
in bits
1001 0010 0100 1001 0010 0100 1001 0010
9 2 4 9 2 4 9 2
It is a repeating pattern of 1 (one unit of line) followed by 00 (two
units of space), in 32 bits you get about ten repetitions which ends up
feeding around 20 dashes to PostScript.
The point is that one could instead have a line pattern of eleven bits
set to one, followed by twenty-one bits set to zero. The results should
be the same because the pattern is stretched, but the pattern fed to
PostScript will only have 2 dashes.
The code in OP performs various manipulations on the line patterns to
reduce the dash data, obviously it is not clever enough to spot the
above.
Conundrum - what is the pattern which produces the longest sequence of
dashes and can't be simplified.
--
David Pilling
email: david@xxxxxxxxxxxxxxxxxxx
web: http://www.davidpilling.net
post: David Pilling P.O. Box 22 Thornton Cleveleys Blackpool. FY5 1LR UK
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