libass (0.12.1)
 * Make ASS drawings with an extremely high number of control points work
   This change increases compatibility with VSFilter.
 * Bugfixes
   * Fix a crash when using newer harfbuzz versions (GH #155)
   * Load embedded memory fonts correctly
   * Large shadow offsets rendered incorrectly (GH #142)
   * Fix incorrect closing of last drawing contour
   * Fix issues with undefined behavior in shifts
   * Lots of of malloc() error checking

libass (0.12.0)
 * Implement fast quad-tree rasterizer in C and SSE2/AVX2 assembly
 * Make \be animatable
 * Add BorderStyle=4 (GH #105)
 * Add selective style override functionality
   * ass_set_selective_style_override()
   * ass_set_selective_style_override_enabled()
 * Support for assembly on DragonFly BSD
 * Bugfixes
   * Various parser fixes
   * Fix premature parser exit on }{ in drawing mode (GH #75)
   * Reset clipping mode on every rectangle clip
   * Improved error handling for FriBidi and FreeType (GH #131)
   * Fix bitmap combining cache

libass (0.11.2)
 * Improve yasm version check
 * Fix \fscx0 crashes
 * Actually export ass_library_version
 * Fix change detection with vector clips
 * SIMD assembly bugfixes
 * Parse drawing numbers as floats (GH #63)
 * Fix shaper sign bug (GH #68)
 * Initialize \pbo correctly (GH #74)

libass (0.11.1)
 * Fix distfile generation
 * No functional changes

libass (0.11.0)
 * Add bitmap run combining/compositing
   This changes the text rendering model and increases compatibility with
   VSFilter. It may make rendering faster or slower in certain cases.
 * Add AVX/SSE2 implementations for \be and compositing
   This adds yasm as (optional) build dependency.
 * Add ass_library_version() API funcion (GC #113)
 * Add 'profile' program for benchmarks
 * Improve gaussian blur
 * Fix compilation with MSVC 2013
 * Speed up HarfBuzz shaper
 * Speed up cache
 * Notable compatibility bugfixes
   * Reset origin on \fay changes (GC #88)
   * Tons of parser fixes
   * Fix ascender/descender metrics (GH #8)
   * Fix \pbo sign and scaling
   * Don't reset wrap style on \r (GC #116, GH #45)
 * Notable bugfixes:
   * Correctly handle @font advance (GC #94)
   * Disable ligatures for non-zero \fsp
   * Make sure to release vector clip (GH #22)

libass (0.10.2)
 * API additions and some ABI changes, bumped SONAME
 * Expose header field for VSFilter color mangling (GC #87)
 * Add functions for explicit scaling hints (GC #6)
 * Add 'type' field to ASS_Image (GC #31)
 * Workaround Freetype's font size grid-fitting where appropriate
 * Apply blur to both glyph and border when using opaque box
 * Parser bugfixes
   * Parse angles in style as number
   * Fix fallback event formats
   * Make closing ')' optional for some tags
   * Fix crazy VSFilter behaviour for \move (GC #90)
   * Make \r fall back to line style (GC #104)
   * Parse style name like VSFilter
   * Ignore junk in nested \t tags
   * Make \clip tag arguments mandatory
 * Properly handle script and language in the HarfBuzz shaper
 * Allow ASS_Track and ASS_Renderer to have different ASS_Library
 * Fix stroking in some rare cases
 * Correctly handle @font advance (GC #94)
 * Fix ascent/descent for some fonts (GC #106)
 * Fix ass_step_sub to not require sorted events
 * Fix blur scaling
 * Don't mutate input strings (GC #88)
 * Remove/change some error messages
 * Fix various small memory leaks

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.
