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@khaledhosny khaledhosny released this 16 Dec 21:36
· 2860 commits to main since this release
6.0.0
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khaledhosny خالد حسني (Khaled Hosny)
GPG key ID: 9AB24930C0B997A2
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  • A new API have been added to pre-process the face and speed up future subsetting operations on that face. Provides up to a 95% reduction in subsetting times when the same face is subset more than once.

    For more details and benchmarks, see:
    https://github.com/harfbuzz/harfbuzz/blob/main/docs/subset-preprocessing.md

    (Garret Rieger, Behdad Esfahbod)

  • Shaping have been speedup by skipping entire lookups when the buffer contents don't intersect with the lookup. Shows up to a 10% speedup in shaping some fonts. (Behdad Esfahbod)

  • A new experimental feature, Variable Composites (enabled by passing -Dexperimental_api=true to meson), is also featured in this release. This technology enables drastic compression of fonts in the Chinese, Japanese, Korean, and other writing systems, by reusing the OpenType Font Variations technology for encoding “smart components” into the font.

    The specification for these extensions to the font format can be found in:
    https://github.com/harfbuzz/boring-expansion-spec/blob/glyf1/glyf1.md

    A test variable font with ~7160 Hangul syllables derived from the NotoSerifKR-VF font has been built, with existing OpenType technology, as
    well as with the new Variable Composites (VarComposites) technology. The VarComposites font is over 90% smaller than the OpenType version of the font!

    Both fonts can be obtained from the “smarties” repository:
    https://github.com/behdad/smarties/tree/3.0/fonts/hangul/serif

    When building HarfBuzz with experimental features enabled, you can test the “smarties” font with a sample character like this:

    $ hb-view butchered-hangul-serif-smarties-variable.ttf -u AE01 --variations=wght=700

    (Behdad Esfahbod)

  • The HarfBuzz subsetter can now drop axes by pinning them to specific values (also referred to as instancing). There are a couple of restrictions currently:

    • Only works with TrueType (glyf) based fonts. CFF2 fonts are not yet supported.
    • Only supports the case where all axes in a font are pinned.

    (Garret Rieger, Qunxin Liu)

  • Miscellaneous fixes and improvements.

    (Behdad Esfahbod, Christoph Reiter, David Corbett, Eli Schwartz, Garret
    Rieger, Joel Auterson, Jordan Petridis, Khaled Hosny, Lorenz Wildberg,
    Marco Rebhan, Martin Storsjö, Matthias Clasen, Qunxin Liu, Satadru Pramanik)

  • New API
    +hb_subset_input_pin_axis_location()
    +hb_subset_input_pin_axis_to_default()
    +hb_subset_preprocess()

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