[Indic-computing-standards] some patent claims related to opentype

[Guntupalli K. <kar...@fr...>]

Hi, 
 Some patents related to handling Opentype. Maybe we should debate on
these, how they affect free s/w or opensource. Also if there is any
relevance to Indic.

Font feature file processing - Adobe Systems

http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=/netahtml/search-adv.htm&r=1&p=1&f=G&l=50&d=ptxt&S1=Opentype&OS=Opentype&RS=Opentype

Methods and apparatus that process a front-end editable text file--a
feature file--that specifies features for a font, and in particular to
an OpenType.TM. font. The specified features are parsed and stored in
the font as font data. The feature file contains simple logic
statements for the specification of various typographical features,
such as layout features, expressed in a high-level feature definition
language. The feature file may contain override values for fields in
font tables. The feature file can be processed in combination with an
existing font file to establish an enhanced font file. 


Using and accessing information from fonts in multiple formats - Sun
Microsystems

http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=/netahtml/search-adv.htm&r=3&p=1&f=G&l=50&d=ptxt&S1=Opentype&OS=Opentype&RS=Opentype


Laying out a paragraph by defining all the characters as a single text
run by substituting, and then positioning the glyphs - Microsoft

http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=/netahtml/search-adv.htm&r=4&p=1&f=G&l=50&d=ptxt&S1=Opentype&OS=Opentype&RS=Opentype

Laying out a paragraph using a layout services library. An entire
paragraph is defined as a single text run. The text run is laid out by
substituting glyphs for the characters of the text run and then
positioning the glyphs. After the text run is laid out, the length of
the text run is compared to the line length. If the length of the text
run exceeds the line length, then the text run is divided into a
parent text run and a child text run. If justification is enabled,
then the parent text run is justified. If a child text run is created,
then the length of the child text run is compared to the line length.
If the length of the child text run exceeds the line length, then the
process is repeated until the length of the last child text run does
not exceed the line length. A layout services library provides text
processing functions which support the paragraph layout and the
justification.


Method for rendering glyphs using a layout services library -
Microsoft

http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=/netahtml/search-adv.htm&r=5&p=1&f=G&l=50&d=ptxt&S1=Opentype&OS=Opentype&RS=Opentype

Rendering glyphs using a layout services library. A layout services
library provides a set of text-processing functions for use by a
client program. The text-processing functions access font information
stored in the font tables insulating the client program from the
details of the font table formats. The layout services library may be
used to identify glyph variants and to position glyphs along a base
line for a run of text. To identify glyph variants, the layout
services library scans the run of text to identify the locations of
characters having alternative glyph forms. The layout services library
creates a list of feature parameter structures, each of which contains
a count of the number of glyph alternates that apply for each
identified character. The client program assembles a list of identical
characters which have different parameters and presents a list of all
glyph variants to the user who chooses one of the alternatives. To
position glyphs, the layout services library assembles data that
describes the advance of a virtual pen point from glyph to glyph along
the base line, an X-placement value, and a Y-placement value. The
X-placement value and the Y-placement value are used to position the
glyph with respect to the virtual pen point on the base line.


Regards,
Karunakar

-- 
Hating people is like burning down your house to get rid of a rat -
Anon

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