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edffdc35a9
Type 2 <=> One-dimensional Group3, customized for TIFF Type 3 <=> Two-dimensional Group3, uses the original 1D internally Type 4 <=> Two-dimensional Group4 So let's clarify that this is not Group3 1D but the TIFF variant, which is called `CCITTRLE` in libtiff. So let's stick with this name to avoid confusion.
26 lines
772 B
C++
26 lines
772 B
C++
/*
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* Copyright (c) 2023, Lucas Chollet <lucas.chollet@serenityos.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 <AK/ByteBuffer.h>
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namespace Gfx::CCITT {
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// You can find a great overview of CCITT compression schemes here:
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// https://www.fileformat.info/mirror/egff/ch09_05.htm
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// The CCITT3 specification is accessible at this page:
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// https://www.itu.int/rec/T-REC-T.4/en
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// The unidimensional scheme is originally described in:
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// 4.1 One-dimensional coding scheme
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// However, this function implements the TIFF variant (see TIFFLoader.h for a spec link),
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// differences are detailed in section:
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// Section 10: Modified Huffman Compression
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ErrorOr<ByteBuffer> decode_ccitt_rle(ReadonlyBytes bytes, u32 image_width, u32 image_height);
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}
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