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There is a small typo in libass/ass_outline.h.
Should read `outline` rather than `ouline`.
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Our effect_timing is currently used as a coordinate relative to a weird origin:
take each glyph's center within the run, apply 3D transforms, pick the leftmost
one, and round it down a little. This makes no sense and is the result of an
unrelated code change. But if I recall correctly, \kf positioning was already
incorrect before that last change (but in a different manner).
To fix this and hopefully to prevent this kind of error from occurring again,
convert effect_timing to absolute screen coordinate.
Start the fill at the glyph run's leftmost post-transform control point.
This matches VSFilter and allows karaoke to work in vertical text (unlike,
for example, starting the fill at the first glyph's pre-transform origin).
Fixes https://github.com/libass/libass/issues/216.
Fixes https://github.com/libass/libass/issues/357.
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This commit enforces strict invariant on ASS_Outline
to contain point coordinates into predetermined range.
Fixes https://github.com/libass/libass/issues/431.
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This also potentially improves performance by copying
and transforming in a single operation rather than
copying first and then transforming the result.
Also transformation function is specialized for case
where expensive perspective division is not necessary.
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This commit defers all outline transformations until rasterization stage.
Combined transformation is then quantized and used as bitmap key.
That should improve performance of slow animations.
Also caching of initial and stroked outlines and bitmaps is now separate
in preparation to proper error estimation for stroker stage.
Note that Z-clipping for perspective transformations is now done
differently compared to VSFilter. That clipping is mostly safety feature
to protect from overflows and divisions by zero and is almost never
triggered in real-world subtitles.
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Purpose of this commit is to simplify logic behind drawing handling.
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FT_Vector and FT_BBox types are based on FT_Pos, which is alias of long.
FreeType treats it as 32-bit integer, but on some platforms long can be
64-bit. That leads to wasted memory and suboptimal performance.
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