Re: Difficulty finding a font file through the libraries

[Michael Brennen <michael@xxxxxxxxxx>]

On Oct 29, 2021, at 03:34, Lawrence D'Oliveiro <ldo@xxxxxxxxxxxxxxxxxxx> wrote:

On Fri, 29 Oct 2021 01:56:45 -0500, Michael Brennen wrote:

... it finds the font in the .ttf file, NOT the .ttf.orig file. The
difference is that in this configuration gs does not go through FC to
find the fonts.

OK, so the problem lies somewhere in the Fontconfig setup, but only
when running that Ghostscript installation. Therefore there must be
something different in how Fontconfig is configured when running
Ghostscript. Environment variables in Apache?

The difficulty is that there is a *lot* going on
in those files, and trying to gain some idea of what they do is not
trivial.

Yes. And we need to do this while reproducing the problem--that is,
running Ghostscript and watching it fail to find the .ttf file and use
.ttf.orig instead. Looking at the FC_DEBUG flags, it may be worthwhile
turning on just about everything (FC_DEBUG=8191). You may end up with a
huge logfile, but at least you can search through it to see where the
.ttf.orig name is coming from.

Glancing briefly over the source, it appears that FcFontSetMatchInternal() should be printing significant debug information when FC_DEBUG=2 (=FC_DBG_MATCHV), but it is not.

I am running gs as follows:

================================

export FC_DEBUG=2

/usr/bin/gs -dNOPAUSE -sDEVICE=jpeg -dJPEGQ=100 -r288 -dDownScaleFactor=4 -sOutputFile=file-q-%02d.jpg "source.ai" -dBATCH >fc_gs_log 2>&1

================================

The contents of fc_gs_log are as follows. FC_DEBUG is set to 2, but there is no debug information. Does anyone have an idea why the extensive debug info is missing? I think I need to see that to understand why the .ttf file is being skipped. Thanks much….

================================

GPL Ghostscript 9.25 (2018-09-13)

Copyright (C) 2018 Artifex Software, Inc.  All rights reserved.

This software comes with NO WARRANTY: see the file PUBLIC for details.

Processing pages 1 through 2.

Page 1

Querying operating system for font files...

DEBUG: FC_WEIGHT didn't match

FC_DEBUG=2

**** Warning: glyf overlaps cmap, truncating.

**** Warning: glyf overlaps cmap, truncating.

**** Warning: glyf overlaps cmap, truncating.

**** Warning: glyf overlaps cmap, truncating.

**** Warning: glyf overlaps cmap, truncating.

Can't find (or can't open) font file /usr/share/ghostscript/Resource/Font/MoongladeDEMO-Regular.

Can't find (or can't open) font file MoongladeDEMO-Regular.

Loading MoongladeDEMO-Regular font from /var/www/ext/resources/fonts/2- Moonglade Regular DEMO.ttf.orig... 4484276 3144792 12161916 2847020 3 done.

Page 2

Can't find (or can't open) font file /usr/share/ghostscript/Resource/Font/MoongladeDEMO-Regular.

Can't find (or can't open) font file MoongladeDEMO-Regular.

Loading MoongladeDEMO-Regular font from /var/www/ext/resources/fonts/2- Moonglade Regular DEMO.ttf.orig... 4765108 3344760 2344716 1014065 3 done.