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On Wed, 03 Feb 1999 14:10:14 -0500, Lummox JR <Lum### [at] aol com> wrote:
>Using Windows 95, POV-Ray version 3.0 as well as 3.1, I get error
>messages when trying to use a particular TrueType font:
>
>"Character XX not found" (XX being the ASCII number of the character)
>All the characters in each line of text are defined in this font, and no
>other programs have trouble using the font except for POV-Ray. They are
>not high-ASCII characters; most of them are uppercase or lowercase
>letters.
>Now here's the stinger: This font is homemade. It was made with a tool
>called Softy, which doesn't allow some additional data (offset/size for
>superscripts, subscripts, etc., etc.) to be defined. Other fonts that
>*do* work have additional table entries that I suspect are expected by
>POV-Ray to be there.
...
>My guess about this bug is that POV-Ray is looking for a part of the
>font file that doesn't need to exist in order to have a working font.
>(However, if anyone can tell me what's still missing, and what I can do
>to add that information to the font, I'd be most grateful.) It should be
>able to check the character map without trouble, but something is
>throwing it off.
The character map is in fact the problem:
; TrueType v1.0 Dump Program - v1.60, Jul 10 1995, rrt, dra, gch, ddb, lcp
; Copyright (C) 1991 ZSoft Corporation. All rights reserved.
; Portions Copyright (C) 1991-1995 Microsoft Corporation. All rights reserved.
; Dumping file 'lummox.ttf'
.
.
.
'cmap' Table - Character To Index Map
-------------------------------------
Size = 408 bytes
'cmap' version: 0
numTables: 2
Subtable 1. Platform ID: 1
Specific ID: 0
'cmap' Offset: 0x00000014
->Format: 0 : Byte encoding table
Length: 0
Version: 0
.
.
.
This is the charmap POV wants to read (it looks for a platform ID of
1 or 3, apparently, using the first one it finds.) However, this charmap
is useless: it doesn't have any entries, so by default maps every character
to glyph zero, though I have some doubts as to whether POV even properly
reads "short" tables.
If you can, make sure your software creates a proper cmap for platform 1,
specific 0, format 0. If your software can't export a proper cmap, you
might have a problem. A little hex editing to change the platform ID on
this bad cmap would do the trick with POV, but I don't know at what offset
within the file that information is stored.
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