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Viewing textures; lout-3.28.user.ps conversion issues

From: K. H. Man
Subject: Viewing textures; lout-3.28.user.ps conversion issues
Date: Wed, 09 Apr 2003 11:39:04 +0800
User-agent: Mozilla/5.0 (Windows; U; Win98; en-US; rv:1.2.1) Gecko/20021130

Hi everyone,

This is my first posting; I am working on some documentation for Lua. It was a nightmare trying to dig into TeX innards (I'm no admirer of some of Knuth's eccentricities :-)), but Lout is a pleasure to use and tweak. Two thumbs up!!

Here is some information on the two issues mentioned. I could not find any information about them in the mailing lists, so I took a stab at finding the problem:

On Ghostview 4.3 and AFPL Ghostscript 7.04 on Win32, textures did not render in the screen display. Printing is OK. However, textures does appear if I set Media->Display Settings...->Depth to 1 bits/pixel or 4 bits/pixel. Textures does not appear on other such settings.

There isn't enough information in the Ghostview 4.3 documentation to find out the reason for the glitch. I guess the sources will have to be consulted.

lout-3.28.user.ps dies while being converted to PDF using Ghostview 4.3 and Ghostscript 7.04 on Win32. The exact location is here: rendering the textured letters -- '3725 7355(ABC)m' right after the 45deg texture creation code on Page 160.

The error message is:
Unrecoverable error: rangecheck in show
Operand stack:
gsapi_execute_cont returns -15
gsapi_exit returns 0

The horizontal striped texture creation went fine. Tweaking the settings -- '2 1 1 45 dg 1 pt 3 pt' I found that the rotate parameter '45 dg' causes Ghostscript to 'give up the ghost' :-), so to speak. :-) Changing the other parms did not cause any error.

Rendering a slanted texture using a @Box (giving LoutBox) was OK, the PDF conversion was successful. It is only rendering of glyphs, such as using the show operator in m. I think Ghostscript 7.04 may have a problem rendering glyphs with a pattern. Changing CompatibilityLevel does not make a difference. Dunno about the behaviour of the latest non-AFPL version. Will report later.

Also, I have compiled Lout 3.28 on DJGPP 3.2.2, all the documents can be processed properly except the user manual. It causes a reboot (!) or it hangs around here:
all[45]->dig[56]:@Include { dia_synt }
I think I will try to isolate this first. Will report later.

Kein-Hong Man (esq.)
Kuala Lumpur, Malaysia... fiddling with Open Source,
bits and pieces at http://www.geocities.com/keinhong/
"It's GNU/Linux dammit!" - RMS
RMS turns 50 on March 16 2003, Happy birthday RMS!!!

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