[FFmpeg-devel] [PATCH 3/4] avcodec/jpeg2000: Simplify exp2fi for numbers used here

[Andreas Rheinhardt]

Tomas Härdin:
> lör 2024-02-17 klockan 21:05 +0100 skrev Andreas Rheinhardt:
>> The call to ff_exp2fi() here always uses arguments in the normal
>> range, so that the branches in ff_exp2fi() are unnecessary.
>> This is so because JPEG2000 itself only supports up to
>> 128 bits per component per pixel (we only support far less);
>> furthermore, expn is always 0..31 for the decoder and also
>> sane for the encoder, so that the difference between these
>> two values is always in the normal range of -126..128.
> 
> Any measurable improvement in decode speed?
> 

I don't think it is measurable; my aim was to move ff_exp2fi() out of
internal.h (where it does not belong).

- Andreas