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LibGfx/JBIG2: Make compute_context() a function pointer

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...instead of a lambda that checks the template on every call.

Doesn't make a performance difference locally, but seems maybe nicer?

No behavior change.
This commit is contained in:
Nico Weber 2024-03-21 08:52:04 -04:00 committed by Andreas Kling
parent 828c640087
commit c4a45bb521
Notes: sideshowbarker 2024-07-17 10:08:28 +09:00 
Author: https://github.com/nico
Commit: https://github.com/SerenityOS/serenity/commit/c4a45bb521
Pull-request: https://github.com/SerenityOS/serenity/pull/23695
1 changed files with 10 additions and 9 deletions
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17
Userland/Libraries/LibGfx/ImageFormats/JBIG2Loader.cpp
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@ -964,16 +964,17 @@ static ErrorOr<NonnullOwnPtr<BitBuffer>> generic_region_decoding_procedure(Gener
return result;
};
auto compute_context = [&inputs, &compute_context_0, &compute_context_1, &compute_context_2, &compute_context_3](NonnullOwnPtr<BitBuffer> const& buffer, int x, int y) -> u16 {
u16 (*compute_context)(NonnullOwnPtr<BitBuffer> const&, int, int);
if (inputs.gb_template == 0)
return compute_context_0(buffer, x, y);
if (inputs.gb_template == 1)
return compute_context_1(buffer, x, y);
if (inputs.gb_template == 2)
return compute_context_2(buffer, x, y);
compute_context = compute_context_0;
else if (inputs.gb_template == 1)
compute_context = compute_context_1;
else if (inputs.gb_template == 2)
compute_context = compute_context_2;
else {
VERIFY(inputs.gb_template == 3);
return compute_context_3(buffer, x, y);
};
compute_context = compute_context_3;
}
// "The values of the pixels in this neighbourhood define a context. Each context has its own adaptive probability estimate
// used by the arithmetic coder (see Annex E)."