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libass (0.10.1)
* Fix letter spacing
* Add \rSTYLENAME syntax support (GC #43)
* Fix border generation and border style reset (GC #56)
* Fix various issues with bug-for-bug compatibility of
transformations (\fax, \fay, etc.) to VSFilter (GC #46, GC #42)
* Fix drawing parsing (GC #47)
* Various fixes to shaper (GC #54, GC #55, GC#59)
* Fix change detection
* Add ass_set_line_position API to set a vertical subtitle offset
* Fix scaling of drawing baseline offset (\pbo) values
* Fix skipping of zero-width characters for FriBiDi shaper
* Use LTR text base direction by default, similar to VSFilter
libass (0.10.0)
* Bidirectional layout and Arabic shaping via FriBidi (GC #13)
* OpenType shaping via HarfBuzz-ng (GC #13)
* Add API for shaper configuration
* Add support for `Language' Script Info property, this can be used for
hinting the text language
* Vertical layout improvements
* Use `vert' and `vkna' OpenType features for vertical glyph variants
* Position rotated glyphs onto baseline
* Parse font encoding property for base text direction hinting
* Refactor cache system
* Use generic outlines in place of FreeType glyphs
* Direct outline bitmap rendering
* Fix whitespace trimming (GC #35)
* Do not render border if there's no shadow or glyph (GC #29)
* Adjust spacing after a italic to non-italic style change (GC #37)
* Fix fade timing
* Fix x positioning with borders (GC #27)
* Build system tweaks
libass (0.9.12)
* Switch to permissive (ISC) license
* Support \fs+ and \fs- syntax for modifying font size
* Fix word-wrapping
* Improved charmap fallback matching
* Handle a few more VSFilter quirks correctly
* Add a sensible default style
* Fix compilation against libpng 1.5
libass (0.9.11)
* Fix serious memory leaks
* Reduce frame/drawing initialization overhead
libass (0.9.10)
* Basic (incorrect, but working) support for @font vertical text layout
* Fix multiple faces per font attachment
* charmap selection fixes
* Add ass_flush_events API function
* Improve fullname font matching
* Better PAR correction if text transforms are used
* Calculate drawing bounding box like VSFilter
* Performance improvements
* Cache vector clip masks
* Avoid unnecessary glyph copies
* Various rendering fixes
libass (0.9.9)
* Parse numbers in a locale-independent way
* Remove support for freetype < 2.2.1, fontconfig < 2.4.1; this especially
means libass will not extract fonts into the file system anymore
* Disable script file size limit
* Match fonts against the full name ("name for humans")
* Reset clip mode after \iclip
* Improve VSFilter compatibility
* Update API documentation
* A couple of smaller fixes and cleanups
libass (0.9.8)
* Support \q override tag
* Support wrap style 1 (i.e. wrap, but do not equalize line lengths)
* Support border style 3 (opaque box)
* Use the event bounding box (instead of vertical position and height) for
collision detection
* Embold glyphs if no bold variant is available, but was requested
* Modify \fax to be similar to VSFilter
* Trim spaces after line wrapping
* Fix border/shadow overlap combining in some cases
* Disable kerning by default. Use "Kerning=yes" style override or
"Kerning: yes" in [Script Info] to enable it
* Slight bitmap handling optimizations
* Various bugfixes
libass (0.9.7)
* Build system fixes
* Fixed cache lookup and overload problems
* All globals have been eliminated, libass is reentrant
* Dynamically allocate glyph and line buffers
* Fix up stroking of big borders
* Support empty lines (\N\N)
* Support for the following override tags:
\fax, \fay, \xshad, \yshad, \ybord, \xbord, \iclip, \u, \s, \p, \pbo
* Full subpixel accuracy for positioning
* PAR and rotation correction for EOSD rendering
* Drawing mode (including vector \clip and \iclip)
* Fixed a few memory leaks
* Removed MPlayer compatibility code
* Introduced message handling callback
* Various fixes to match VSFilter quirks and Windows font metrics
* Lots of bugfixes
LibASS (0.9.6)
* Various fixes and updates to match VSFilter renderer.
* Support \blur tag and ScaledBordersAndShadow property.
* Fractional arguments and subpixel accuracy.
* Keep positions when pan-and-scan is used.
* Lots of bugfixes and other changes.
LibASS (0.9.5)
* Support '=' and '.' in style name in arguments to ass_set_style_overrides().
* Allow overriding [Script Info] parameters with ass_set_style_overrides().
* Add workarounds for some buggy fonts.
* Remove buggy workarounds for some other fonts.
* Fixed ass_set_line_spacing() (was broken before).
* Negative margin sizes are now used for image cropping.
* Better handling of behind-the-camera objects.
* Case insensitive parsing of SSA/ASS section headers.
* Improved font matching.
* When 2 styles have the same name, the later one is used.
* Fixed several other bugs.
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