Port to harfrust/skrifa with hinting and variable font support

.github/copyright.sh

@@ -7,7 +7,8 @@
 #   -g "!src/special_directory"
 
 # Check all the standard Rust source files
-output=$(rg "^// Copyright (19|20)[\d]{2} (.+ and )?the Resvg Authors( and .+)?$\n^// SPDX-License-Identifier: Apache-2\.0 OR MIT$\n\n" --files-without-match --multiline -g "*.{rs,c,cpp,h}" .)
+# Exclude vendored fontdb (has its own copyright from original author)
+output=$(rg "^// Copyright (19|20)[\d]{2} (.+ and )?the Resvg Authors( and .+)?$\n^// SPDX-License-Identifier: Apache-2\.0 OR MIT$\n\n" --files-without-match --multiline -g "*.{rs,c,cpp,h}" -g "!crates/fontdb/*" .)
 
 if [ -n "$output" ]; then
 	echo -e "The following files lack the correct copyright header:\n"

.gitignore

@@ -4,3 +4,4 @@ target
 .vscode
 tools/build-*
 **/diffs
+**/diffs-hinted

.typos.toml

@@ -16,6 +16,7 @@ SVGinOT = "SVGinOT"
 
 # Match Inside a Word - Case Insensitive
 [default.extend-words]
+wdth = "wdth"
 
 [files]
 # Include .github, .cargo, etc.

CHANGELOG.md

@@ -10,6 +10,35 @@ This changelog also contains important changes in dependencies.
 
 This release has an MSRV of 1.87.0 for `usvg` and `resvg` and the C API.
 
+### Added
+
+- Hinting support for text rendering with configurable settings via CSS custom properties
+  (`-resvg-hinting-target`, `-resvg-hinting-mode`, `-resvg-hinting-engine`,
+  `-resvg-hinting-symmetric`, `-resvg-hinting-preserve-linear-metrics`).
+- Variable font support with avar-aware axis normalization for correct rendering.
+- LRU cache for glyph outlines with full parameter support (hinting settings, variations, ppem).
+  Dramatically improves performance for text-heavy documents with repeated glyphs.
+- Cache statistics tracking (`CacheStats`) for monitoring outline cache hits/misses/evictions.
+- Cache management methods: `outline_cache_stats()`, `clear_outline_cache()`,
+  `resize_outline_cache()`, `outline_cache_len()`, `outline_cache_capacity()`.
+
+### Changed
+
+- Port text rendering from `ttf-parser`/`rustybuzz` to `skrifa`/`harfrust`.
+- Vendor `fontdb` 0.23.0 as a workspace crate, ported from `ttf-parser` to `skrifa`.
+  This eliminates the `ttf-parser` dependency entirely.
+- Move span-uniform fields (`variations`, `font_optical_sizing`, `hinting`) from
+  `PositionedGlyph` to `Span` for reduced memory usage and better cache efficiency.
+- Unify three outline extraction code paths (simple/variable/hinted) into single cached lookup.
+
+### Fixed
+
+- Remove empty `--drop-tables` flag from README.
+- Fix potential panics on empty slices in font fallback.
+- Add empty path check in `path_length()`.
+- Add ASCII validation for font variation tags.
+- Fix incorrect safety comment on mmap in fontdb.
+
 ## [0.46.0]
 
 This release has an MSRV of 1.87.0 for `usvg` and `resvg` and the C API.

Cargo.toml

@@ -1,6 +1,7 @@
 [workspace]
 members = [
     "crates/c-api",
+    "crates/fontdb",
     "crates/resvg",
     "crates/usvg",
     "crates/usvg/codegen",