71 lines
3.9 KiB
Text
71 lines
3.9 KiB
Text
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********************** About Tibetan Machine Uni File *****************************
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Author: Than Garson
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Date: August 18, 2004
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Organization: Tibetan & Himalayan Digital Library (http://thdl.org)
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The SoureForge CVS folder, thdltools/Fonts/TibetanMachineUni, contains the alpha version of the
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Tibetan Machine Uni font, which is an OpenType, Unicode version of the original Tibetan Machine font.
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The original font, Tibetan Machine, was designed and created by Tony Duff of the Tibetan Computer company (http://www.tibet.dk/tcc/).
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Tibetan Machine was purchased and made available to the public under the GNU Public License by the Trace Foundation (http://trace.org/).
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This suite of fonts was converted into a single OpenType Unicode font by the Than Garson of the Tibetan & Himalayan Digital Library
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and Chris Fynn. Tibetan Machine Uni is also governed by the GPL (http://www.gnu.org/copyleft/gpl.html).
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The folder contains several versions of the font plus the table data imbedded in the font with the OpenType rendering instructions.
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The following files have been included:
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* TibetanMachineUniAlpha.ttf - This is the "shipped" True Type version of the font with all production tables removed.
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It functions as a regular font but the user cannot view the lookup tables.
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* TibetanMachineUniAlphaFL.vfb - This is the FontLab file from which the True Type font was created.
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* TibetanMachineUniAlphaVolt.ttf - This is the True Type version of the font WITH the production tables embedded.
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One can view these tables through using Microsoft's VOLT program.
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VOLT stands for Visual OpenType Layout Tool. For details, see:
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http://www.microsoft.com/typography/developers/volt/default.htm
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* TableData [folder] - This folder contains the data exported from VOLT that makes up the OpenType Layout tables.
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It contains the following files and folders:
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* TMUniAlphaGlyphs.vtd - This is the glyph-definition table that assigns names and types to the glyphs
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based on their index number.
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* GlyphGroups [folder] - This folder contains 24 tables that define the glyph groups within VOLT.
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The files are named as they appear in the VOLT interface.
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* Lookups [folder] - This folder contains 27 tables the define the lookups within VOLT.
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The naming of the glyphg roups is based on the following abbreviations:
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U - refers to a group that takes a certain "u" or zhabs kyu.
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V - refers to a group that takes a certain set of (subscribed) vowels that are all at the same height.
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N - means "negative" because the minus sign cannot be used in a group name.
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B - means an alternative set of glyphs
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### - numbers in the name refer to the height of the vowel or zhabs kyu used.
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Example: VN324GLYPHS.vtg - is a group of glyphs which take vowels at the height of -324.
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U0BGLYPHS.vtg - is a group of glyphs which take an alternate zhabs kyu whose height is the baseline (0).
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The zhabs kyu glyph is itself called uni0F74.alt0b.
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The names of the vowel glphys in FontLab and in Volt were created in the following way: "uni" + hex unicode + ".alt" + height.
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Thus, "uni0F71.altN180" is the subscribed a-chung whose uppermost height is -180. In this way, the glyph groups are named in a
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way that easily corresponds them to the appropriate vowel glyphs. Because there was greater variety of zhabs kyus (u) in the
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original fonts, these have sometimes required a second layer of lookups to apply the most appropriate version.
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The Lookup tables follow the same naming procedure, except that they do not have "GLYPHS" appended at the end of their names. Thus,
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"V252.vtl" contains the lookups for substituting vowels whose max height is 252. Of course, these lookups are applied to the
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"V252GLYPHS.vtg" glyph group, and so on.
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Please refer any questions to thdltools-devel@lists.sourceforge.net
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or
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to Chris Fynn or Than Garson through the THDL Tools project at Source Forge: http://sourceforge.net/projects/thdltools
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