harfbuzz/harfbuzz 15.1.0

on GitHub

Add buffer deserialization APIs that report progress as a byte offset, for use from introspection bindings.

Fix Indic shaping of the Unicode 18 Devanagari and Bengali additions.

Fix Arabic fallback shaping: wrong ligatures when a component is missing from the font, and disappearing marks in legacy fonts.

Fix COLR glyph extents and mark positioning in fonts with empty layers.

Fix AAT shaping: wrong kerx kerning (formats 1 and 2) and mark positioning (format 4, a 14.3.0 regression), and ignored kern and mort tables with a non-first initial state.

Various fixes to the Graphite2 shaper.

Report HarfRust shaping failures through hb_buffer_allocation_successful().

Fix wrong outlines in gvar fonts with intermediate tuples.

Fix hb_face_create_or_fail() rejecting face indices with named-instance bits set.

Fix wrong fallback metrics: the vertical descender in fonts without vhea, and the hanging baseline for some scripts.

Fix hb_ot_layout_lookup_collect_glyph_alternates() collecting garbage from AlternateSubst and SingleSubst format 1 lookups.

Speed up shaping on faces with many shape plans, hb_language_from_string(), vertical text with hb-ft, and CBDT and sbix fonts.

Fix crashes and deadlocks with FreeType, including hb_ft_font_set_funcs() on immutable fonts and font queries from color paint callbacks.

Fix crashes with NULL result pointers in hb_ot_metrics_get_position_with_fallback(), hb_ot_layout_get_font_extents(), and hb_ot_layout_get_font_extents2().

Fix use-after-free in hb_map_update() when updating a map from itself.

Various fixes for crashes, hangs, and memory use with malformed fonts.

Faster subsetting of large GSUB and GPOS tables, and smaller CFF output.

Partially instancing or desubroutinizing CFF2 fonts with nested blends now fails instead of changing the outlines.

Subsetting now fails if a glyph mapping assigns another glyph to glyph 0.

Fix hb_subset_axis_range_from_string() reading past the given length.

Fix subsetting beyond-64k variable fonts losing HVAR advance deltas.

Various subsetting and instancing fixes, mostly for CFF, CFF2, and COLR.

Fix rotated and skewed rectangle clips hiding their contents in the raster library, and out-of-bounds access when extents change during painting.

Fix the vector library mirroring path clips in SVG, and writing PDFs with wrong page bounds and misplaced or clipped COLR gradients.

Fix wrong clipping of COLR layers in the GPU library.

Various Cairo integration fixes, including a memory leak per scaled font.

Fix hb-info --list-* crashes on unusual fonts.

Various build and CI fixes.

New API:
+hb_buffer_deserialize_glyphs2()
+hb_buffer_deserialize_unicode2()