[codegen] Add OffsetSource trait #1472
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This is a way of encoding the source of offset data in the case where it has to be passed in. With this change, the method for getting a `Script` from a `ScriptRecord` looks like, ```rust fn script<'a>(&self, data: impl OffsetSource<'a, ScriptList<'a>>) ``` instead of, ```rust fn script<'a>(&self, data: FontData<'a>) ``` To avoid breakage, `FontData` can still be passed directly to any method that accepts an `OffsetSource` argument. This is not publically documented, though, and it is expected that new code would pass in the tables themselves.
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This is a way of encoding the source of offset data in the case where it has to be passed in, which has been a longstanding request.
With this change, the method for getting a
Scriptfrom aScriptRecordlooks like,instead of,
To avoid breakage (this should break no existing code),
FontDatacan still be passed directly to any method that accepts anOffsetSourceargument. This is not publicly documented, though, and it is expected that new code would pass in the tables themselves.