v0.1.15

[0.1.15] - 2026-10-16

What's Changed

Compatibility

• LayoutOptions keeps the v0.1.14 fields and layout(nodes, options) keeps its
  signature. Existing full struct literals and exhaustive patterns remain valid.
  Host-provided glyph metrics use the additive layout_with_fallback_metrics
  API; no caller migration is required. The C ABI and DisplayList JSON remain
  unchanged.

Added

• \slashed and \centernot commands.
• Mac Catalyst support in the Apple XCFramework and Swift package.
• layout_with_fallback_metrics(nodes, options, metrics) for host-provided
  fallback glyph metrics and more accurate text spacing. See the API rustdoc
  for an example and layout validation for resource limits.
• Configurable PNG/SVG padding in the CLI.
• Borrowed lexer tokens via Lexer::next_span() and TokenSpan.

Fixed

• PNG rendering reports malformed large-font errors instead of succeeding with missing glyphs.
• PNG glyphs shifting by one pixel after cache reuse at different positions.
• mhchem spacing regression caused by escaped ## source locations.
• Color inheritance for rules, boxes, and related symbols.
• Website rendering before fonts finish loading.
• Website font-loading failures now time out and allow retrying without reloading the page.
• Delimiter cache keys no longer serialize the host's fallback glyph metrics map on every lookup.
• iOS linking failures involving unwind symbols.

Security

• Bound macro expansion, mhchem intermediates, and layout work, including
  \edef/\xdef, \pmb, and Array/CD padding.
• Reject overflowing \char values and oversized PNG allocations.
• Bound dashed-line rendering and clip work to the viewport.
• Enforce Android 16 KB ELF alignment and verify release packages.

See resource limits for scope and limitations.

Performance

• Cache glyph masks and emoji rasters; share font buffers and load fallback
  fonts on demand.
• Reuse built-in macros and delimiter measurements; reduce allocations in
  PNG encoding and SVG serialization.

Latest comparison with v0.1.14 (lower is better):

Metric	v0.1.14	Unreleased	Change
PNG render	717 μs	339 μs	−53%
SVG standalone	938 μs	403 μs	−57%
End-to-end PNG	1,030 μs	506 μs	−51%
Peak RSS	389.5 MiB	218.6 MiB	−44%

Measured on x86_64 macOS with Rust 1.95.0 and matching dependencies: 100 formulas
in release mode, one warmup and three measured renders per formula, median of
five alternating runs. RSS excludes compilation. These are warmed-render
results; cold renders and continually changing glyph positions may differ.

PRs

• feat(Performance): png & svg by @erweixin in #152
• fix(layout): inherit formula color for implicit geometry by @Yash-Singh1 in #155
• fix(font-loading): enhance font loading mechanism with stylesheet readiness and improved error handling by @erweixin in #156
• fix(ios): build XCFramework with panic-abort std by @chasing1874 in #153
• feat(cli): add configurable padding for PNG and SVG by @Tao-Boy in #160
• test(core): capture compatibility baselines for refactoring by @erweixin in #157
• feat: support \slashed by @erweixin in #161
• feat: support \centernot relation negation by @erweixin in #166
• feat(ios): add Mac Catalyst XCFramework support by @kirill-markin in #167
• fix(ios): improve Catalyst XCFramework workflow and font registration checks by @erweixin in #169
• fix(android): add Android ELF alignment checks and verification scripts by @erweixin in #170
• feat(layout): take host metrics for glyphs the KaTeX fonts lack by @codec4 in #168
• fix: enforce resource limits across parsing, layout, and rendering and improve font loading by @erweixin in #171
• chore: update version to 0.1.15 by @erweixin in #172

New Contributors

• @Yash-Singh1 made their first contribution in #155
• @chasing1874 made their first contribution in #153
• @Tao-Boy made their first contribution in #160
• @kirill-markin made their first contribution in #167
• @codec4 made their first contribution in #168

Full Changelog: v0.1.14...v0.1.15