Bug 26207

Summary:	Support OpenType optical sizes
Product:	fontconfig	Reporter:	Khaled Hosny <dr.khaled.hosny>
Component:	library	Assignee:	fontconfig-bugs
Status:	RESOLVED WONTFIX	QA Contact:	Behdad Esfahbod <freedesktop>
Severity:	enhancement
Priority:	medium	CC:	akira, freedesktop, panov
Version:	2.8
Hardware:	All
OS:	All
Whiteboard:
i915 platform:		i915 features:
Attachments:	A testcase for fontconfig Another testcase

Description Khaled Hosny 2010-01-25 05:43:58 UTC

OpenType supports specifying font's optical size through a GPOS 'size' feature (very odd place for such information!), it'd be nice of FC can cache such info and deliver the right match based on the requested font size.

See http://www.microsoft.com/typography/OTSPEC/features_pt.htm#size for more details.

Comment 1 Khaled Hosny 2010-01-25 05:56:59 UTC

Currently, the only free font family that I know of with multiple optical sizes is Latin Modern (http://www.gust.org.pl/projects/e-foundry/latin-modern), and it is looks very broken with FC (returns styles like "10 Regular" and "8 Regular" for 10 and 8 fonts respectively, etc.)

Comment 2 Behdad Esfahbod 2013-01-16 01:45:09 UTC

This is implemented in HarfBuzz now.  One more benefit if we decide to depend on HarfBuzz.

Comment 3 Andrey V. Panov 2014-11-06 03:13:20 UTC

Created attachment 109005 [details]
A testcase for fontconfig

Here is attached a set of Computer Modern based fonts in the opentype collection format with the 'size' feature.

Comment 4 Andrey V. Panov 2014-11-06 03:19:18 UTC

Created attachment 109006 [details]
Another testcase

This is similar to the previous attachment but was made as separate otf files.

Comment 5 Behdad Esfahbod 2014-11-09 01:59:44 UTC

FWIW, OpenType moved into the direction of adding optical size range to OS/2 table instead, and that's already supported in fontconfig.  Closing this as WONTFIX.

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