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LibVideo/VP9: Index inter-frame references with named fields or an enum

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Previously, we were using size_t, often coerced from bool or u8, to
index reference pairs. Now, they must either be taken directly from
named fields or indexed using the `ReferenceIndex` enum with options
`primary` and `secondary`. With a more explicit method of indexing
these, the compiler can aid in using reference pairs correctly, and
fuzzers may be able to detect undefined behavior more easily.
This commit is contained in:
Zaggy1024 2022-11-25 03:03:22 -06:00 • committed by Andreas Kling
parent 3af4deba6d
commit f4761dab09
8 changed files with 174 additions and 157 deletions
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6
Userland/Libraries/LibVideo/VP9/Decoder.h
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@ -63,13 +63,13 @@ private:
// (8.5.1) Inter prediction process
DecoderErrorOr<void> predict_inter(u8 plane, BlockContext const& block_context, u32 x, u32 y, u32 width, u32 height, u32 block_index);
// (8.5.2.1) Motion vector selection process
MotionVector select_motion_vector(u8 plane, BlockContext const&, u8 ref_list, u32 block_index);
MotionVector select_motion_vector(u8 plane, BlockContext const&, ReferenceIndex, u32 block_index);
// (8.5.2.2) Motion vector clamping process
MotionVector clamp_motion_vector(u8 plane, BlockContext const&, u32 block_row, u32 block_column, MotionVector vector);
// (8.5.2.3) Motion vector scaling process
DecoderErrorOr<MotionVector> scale_motion_vector(u8 plane, u8 ref_list, u32 x, u32 y, MotionVector vector);
DecoderErrorOr<MotionVector> scale_motion_vector(u8 plane, ReferenceIndex, u32 x, u32 y, MotionVector vector);
// From (8.5.1) Inter prediction process, steps 2-5
DecoderErrorOr<void> predict_inter_block(u8 plane, BlockContext const&, u8 ref_list, u32 block_row, u32 block_column, u32 x, u32 y, u32 width, u32 height, u32 block_index, Span<u16> block_buffer);
DecoderErrorOr<void> predict_inter_block(u8 plane, BlockContext const&, ReferenceIndex, u32 block_row, u32 block_column, u32 x, u32 y, u32 width, u32 height, u32 block_index, Span<u16> block_buffer);
/* (8.6) Reconstruction and Dequantization */