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7296b0fa43
A tag tree is a data structure used for deserializing JPEG2000 packet headers. We don't use them for anything yet, except from tests. The implementation feels a bit awkward to me, but we can always polish it later. The spec thankfully includes two concrete examples. The code is correct enough to pass those -- I added them as test.
54 lines
1.1 KiB
C++
54 lines
1.1 KiB
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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#pragma once
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#include <LibGfx/ImageFormats/ImageDecoder.h>
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namespace Gfx {
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namespace JPEG2000 {
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struct TagTreeNode;
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class TagTree {
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public:
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TagTree(TagTree&&);
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~TagTree();
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static ErrorOr<TagTree> create(u32 x_count, u32 y_count);
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ErrorOr<u32> read_value(u32 x, u32 y, Function<ErrorOr<bool>()> const& read_bit, Optional<u32> stop_at = {}) const;
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private:
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TagTree(NonnullOwnPtr<TagTreeNode>);
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NonnullOwnPtr<TagTreeNode> m_root;
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};
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}
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struct JPEG2000LoadingContext;
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class JPEG2000ImageDecoderPlugin : public ImageDecoderPlugin {
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public:
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static bool sniff(ReadonlyBytes);
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static ErrorOr<NonnullOwnPtr<ImageDecoderPlugin>> create(ReadonlyBytes);
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virtual ~JPEG2000ImageDecoderPlugin() override = default;
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virtual IntSize size() override;
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virtual ErrorOr<ImageFrameDescriptor> frame(size_t index, Optional<IntSize> ideal_size = {}) override;
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virtual ErrorOr<Optional<ReadonlyBytes>> icc_data() override;
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private:
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JPEG2000ImageDecoderPlugin();
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OwnPtr<JPEG2000LoadingContext> m_context;
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};
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}
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