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LibGfx: Add some support for decoding lossless webp files

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Missing:
* Transform support (used by virtually all lossless webp files)
* Meta prefix / entropy image support

Working:
* Decoding of regular image streams
* Color cache

This happens to be enough to be able to decode
Tests/LibGfx/test-inputs/extended-lossless.webp

The canonical prefix code is very similar to deflate's, enough so that
this can use Compress::CanonicalCode (and take advantage of all the
recent performance improvements there).
This commit is contained in:
Nico Weber 2023-03-31 11:09:58 -04:00 • committed by Jelle Raaijmakers
commit c84968dafd
Notes: sideshowbarker 2024-07-17 03:30:41 +09:00
2 changed files with 360 additions and 1 deletions
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1
Userland/Libraries/LibCompress/Deflate.cpp
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@ -430,7 +430,6 @@ ErrorOr<void> DeflateDecompressor::decode_codes(CanonicalCode& literal_code, Opt
auto const code_length_code = TRY(CanonicalCode::from_bytes({ code_lengths_code_lengths, sizeof(code_lengths_code_lengths) }));
// Next we extract the code lengths of the code that was used to encode the block.
Vector<u8, 286> code_lengths;
while (code_lengths.size() < literal_code_count + distance_code_count) {
auto symbol = TRY(code_length_code.read_symbol(*m_input_stream));