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Use the bitmap pointer for the cache hash key. This preserves the
blending history, which fixes occasional corruptions due to previous
replacements not being dealt with correctly. It also simplifies the
hash key a lot and thus speeds up cache lookups.
Additionally, change the blending equation from max(a, b) to min(a + b,
0xff), i.e. a saturating addition. Usually this looks a lot better.
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Add new fields to the cache hash key for BorderStyle 3 (glyph cache
and bitmap cache).
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Rename all typedefs from the convention foo_bar_t, which can possibly
conflict with POSIX types, to FooBar (and ASS_FooBar for public
API typedefs). Fix formatting and stray comments while at it.
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Remove useless _s suffix from struct names and remove struct name where
not needed (only the typedef'd struct is used). Clean up API headers.
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The shift is not calculated when fetching a glyph anymore. Instead,
it is calculated right before rasterizing a glyph. Remove the
shift vector and make get_outline_glyph, the glyph cache and
ass_font_set_transform work without supplying a shift vector.
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Rename ass_cache_template.c to ass_cache_template.h; add libass.sym to
EXTRA_DIST.
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