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[subset] add a note to hb-subset on what is and isn't supported (#3076)

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Garret Rieger 2021-07-27 12:21:19 -06:00 committed by GitHub
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src/hb-subset.cc
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@ -64,6 +64,15 @@
* that is no longer needed. A subset input describes the desired subset. The input is
* provided along with a font to the subsetting operation. Output is a new font file
* containing only the data specified in the input.
*
* Currently most outline and bitmap tables are supported: glyf, CFF, CFF2, sbix,
* COLR, and CBDT/CBLC. This also includes fonts with variable outlines via OpenType
* variations. Notably EBDT/EBLC and SVG are not supported. Layout subsetting is supported
* only for OpenType Layout tables (GSUB, GPOS, GDEF). Notably subsetting of graphite or AAT tables
* is not yet supported.
*
* Fonts with graphite or AAT tables may still be subsetted but will likely need to use the
* retain glyph ids option and configure the subset to pass through the layout tables untouched.
*/
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