Backports from Cyberbeing + negative Encoding #46
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The GUI settings only define the default behaviour
for files without LayoutRes{X,Y} headers.
Backported from: Cyberbeing/xy-VSFilter@1ca5e4b
Backported from: Cyberbeing/xy-VSFilter@532b756
Backported from: Cyberbeing/xy-VSFilter@04afcbd
Backported from: Cyberbeing/xy-VSFilter@0d64ad7 (2014-10-19)
Similar to the preceeding commit backported from Cyberbeing/xy-VSFilter, let’s adjust the name so users can distinguish Cyberbeing/xy-VSFilter from pinterf/xy-VSFilter if say builds from both are placed into Aegisub’s csri directory. Latest releases are numbered 3.2.x.x, so update the version advertised in CSRI to match.
Back in 2012 libass added a custom Encoding=-1 extension to enable automatic BiDi base direction instead of the usual LTR default. The assumption/hope presumably was that since all valid font encodings are positive VSFilter would just gracefully ignore them. However, this is unfortuantely not the case. When passed to GDI the charSet is cast to a byte and will wrap around to a valid value, severely restricting which fonts can be used. Searching through a large pile of subtitles the only hits for negative values in the Encoding field were from generally corrupted files. It thus appears so far fortunately nobody used the extension in released fiels (only transient conversion from other formats during playback) and also nobody is relying on the wraparound in VSFilter. To minimise future problems treat all negative Encodings as the default charset. This matches how libass does fontselection for -1 albeit it doesn't reproduce the BiDi base direction. It also conveniently carves out the [-2, INT_MIN] range for potential future extensions common to VSFilters and libass, e.g. Encoding=-2 for a RTL base direction (which should be easier to implement in VSFilter than auto base direction)
Owner
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Great work, thanks. Then these changes can safely be merged and this PR will not get further modifications? |
Contributor
Author
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Yes, no further modifications to the PR are planned and everything should be good to merge. |
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Backports recently merged changes from Cyberbeing/xy-VSFilter and the CSRI name change mentioned in #38:
@Masaiki: Cyberbeing/xy-VSFilter#20 and Cyberbeing/xy-VSFilter#22 di not apply cleanly. The former has a large swath of conflicts, for the latter exactly the edited section changed between Cyberbeing and pinterf. Not only were comments moved, but one version uses plain
Divthe otherNormalizedDivversions in their respective calculations. Are those patches also needed in pinterf/xy-VSFilter and if yes, can you take a look?I omitted the not-yet-merged VapourSynth PR by Masaiki due to having no experience with the code they touch Cyberbeing/xy-VSFilter#24
@pinterf: with this and potentially the remaining PRs by Masaiki merged, it should presumably be in good shape for a new release such that people can actually use
LayoutResetc