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LibGfx+LibVideo: Make BooleanDecoder usable for both VP8 and VP9

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The marker bit is VP9-only, so move that into a new initialize_vp9()
function.

finish_decode() is VP9-only, so rename that to finish_decode_vp9().
This commit is contained in:
Nico Weber 2023-05-26 15:08:22 -04:00 • committed by Andreas Kling
parent fbc53c1ec3
commit 1dfb065a9c
4 changed files with 19 additions and 9 deletions
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11
Userland/Libraries/LibGfx/ImageFormats/BooleanDecoder.cpp
View file

@ -11,14 +11,19 @@
namespace Gfx {
/* 9.2.1 */
ErrorOr<BooleanDecoder> BooleanDecoder::initialize(MaybeOwned<BigEndianInputBitStream> bit_stream, size_t size_in_bytes)
{
VERIFY(bit_stream->is_aligned_to_byte_boundary());
auto value = TRY(bit_stream->read_value<u8>());
u8 range = 255;
u64 bits_left = (8 * size_in_bytes) - 8;
BooleanDecoder decoder { move(bit_stream), value, range, bits_left };
return BooleanDecoder { move(bit_stream), value, range, bits_left };
}
/* 9.2.1 */
ErrorOr<BooleanDecoder> BooleanDecoder::initialize_vp9(MaybeOwned<BigEndianInputBitStream> bit_stream, size_t size_in_bytes)
{
BooleanDecoder decoder = TRY(initialize(move(bit_stream), size_in_bytes));
if (TRY(decoder.read_bool(128)))
return Error::from_string_literal("Range decoder marker was non-zero");
return decoder;
@ -63,7 +68,7 @@ ErrorOr<u8> BooleanDecoder::read_literal(u8 bits)
}
/* 9.2.3 */
ErrorOr<void> BooleanDecoder::finish_decode()
ErrorOr<void> BooleanDecoder::finish_decode_vp9()
{
while (m_bits_left > 0) {
auto padding_read_size = min(m_bits_left, 64);