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HarfBuzz does
The planner now picks who positions as HarfBuzz 10.2 does: GPOS, the old
kern table when GPOS has no kern feature, and marks placed by combining
class and ink boxes when there is no GPOS; the Hangul shaper composes
syllables the font has whole, takes apart those it lacks into jamo for
ljmo, vjmo and tjmo, and moves tone marks before their syllable.
The section grows to an 80-byte header (the kern table, and each glyph's
ink box when a plan places marks without GPOS) and 88-byte plans (the
kern mask, the jamo masks). Kern tables are applied pair subtable by
pair subtable with HarfBuzz's own binary search; state machines, class
subtables and cross-stream kerning, which no installed font has, are
refused. The check spells Hangul syllables every way text does.
Every installed font Vega accepts shapes as HarfBuzz does (209 fonts,
1,520 plans, a thousand runs each), and the fonts refused before at
20,000 runs a plan: Noto Sans CJK KR and Baekmuk for Hangul, IPA Gothic
and Noto Mono for marks without GPOS, FreeSans, FreeSerif, Liberation
and DejaVu Sans ExtraLight for kern tables, Unifont's Latin, Greek,
Cyrillic, Hebrew and Hangul.
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vega display --access joins the accessibility bus as AT-SPI2 objects for
screen readers such as Orca, with no toolkit, ATK or libdbus: dbus.c
speaks the D-Bus wire format (EXTERNAL authentication, headers, aligned
bodies, calls, replies, signals). The tree follows what the say surface
says: a heading, a label per field, a list box per list whose items know
their place and which is selected and focused, tables, the entry, the
keys as buttons; answers come from the app when asked, one object has the
focus, and focus moves are said as events. Assistive technology can act
too: Selection focuses a row, Action presses a key. The live loop now
draws only when something changed, so a screen reader's questions no
longer cost frames. The check walks the tree with gdbus on a private
session bus with at-spi-bus-launcher, and follows the focus through keys,
Selection, Action and the events.
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Chromium's accessibility tree
Lists are listboxes that keep the keyboard focus, the focused row their
active descendant, each option with its place in the whole list though
only the visible rows are drawn; tables are grids with row indices;
tones other than normal and muted are said, not only coloured; keys are
named buttons. The page now updates in place instead of rebuilding each
list, so the focus a screen reader follows survives every redraw. The
browser test reads Chromium's accessibility tree: roles, names, focus,
selection and the active descendant moving within the same list.
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order
text/layout.c puts the checked parts together: a paragraph's levels,
scripts resolved for Common and Inherited characters, break
opportunities, one shaping to measure, lines broken at the last
opportunity that fits (trailing spaces hang, and a line that shapes
wider than measured backs off), then per line L1, runs of one level and
one script shaped again, the runs in L2's order and their glyphs placed.
test-layout checks 30,000 random mixed-script paragraphs: lines cover
the text, mandatory breaks end lines, lines fit when they can, and
glyphs come in the order UAX #9 gives the characters. vega-symbols
paragraph draws a layout through the symbol file's glyphs.
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UAX #14 line breaking (LB1-LB31, numbers tailored as Unicode's tests
are) and UAX #29's grapheme cluster, word and sentence boundaries, each
from generated property tables, the rules taken in order, in linear time.
They pass all of Unicode 15.1's LineBreakTest (10,274 cases),
GraphemeBreakTest (1,187), WordBreakTest (1,826) and SentenceBreakTest
(512).
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The build tool compiles a font's shaping plans the way HarfBuzz's planner
does (features, stages, masks, lookups per script and direction) and
carries them with the font's character map, advances and GDEF, GSUB and
GPOS tables in a section of the symbol file (VEGASYM4); glyphs shaping
reaches become symbols of their own. A small engine ports HarfBuzz 10's
default, Arabic and Hebrew shaping step for step and reads the tables in
place, every read bounds-checked. The build refuses a file whose shaping
differs from HarfBuzz's on random runs: DejaVu Sans agrees on 600,000
runs in six scripts both ways, and every installed font the tool accepts
agrees too, at 1.05-1.18 times HarfBuzz's time.
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