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ed2658d72c
No behavior change. No measurable performance different either. (I tried `hyperfine 'Build/lagom/bin/image --no-output foo.webp'` for a few input images before and after this change, and I didn't see a difference. I also tried if moving both Gfx::CanonicalCode::read_symbol() and Compress::CanonicalCode::read_symbol() inline, and that didn't help either.)
35 lines
952 B
C++
35 lines
952 B
C++
/*
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* Copyright (c) 2024, Nico Weber <thakis@chromium.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibGfx/ImageFormats/WebPSharedLossless.h>
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namespace Gfx {
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ErrorOr<CanonicalCode> CanonicalCode::from_bytes(ReadonlyBytes bytes)
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{
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auto non_zero_symbol_count = 0;
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auto last_non_zero_symbol = -1;
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for (size_t i = 0; i < bytes.size(); i++) {
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if (bytes[i] != 0) {
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non_zero_symbol_count++;
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last_non_zero_symbol = i;
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}
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}
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if (non_zero_symbol_count == 1)
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return CanonicalCode(last_non_zero_symbol);
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return CanonicalCode(TRY(Compress::CanonicalCode::from_bytes(bytes)));
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}
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ErrorOr<u32> CanonicalCode::read_symbol(LittleEndianInputBitStream& bit_stream) const
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{
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return TRY(m_code.visit(
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[](u32 single_code) -> ErrorOr<u32> { return single_code; },
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[&bit_stream](Compress::CanonicalCode const& code) { return code.read_symbol(bit_stream); }));
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}
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}
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