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LibGfx/CCITT: Add PDF-specific options for CCITT3 1D

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These two options are additions of the PDF specification. They are valid
for both 1D and 2D, but let's bail out if we encounter them in a 2D
image, as we don't have a test case yet.
This commit is contained in:
Lucas CHOLLET 2024-03-18 13:26:30 -04:00 committed by Andreas Kling
parent 6fc59039c4
commit 7730b743db
Notes: sideshowbarker 2024-07-17 06:29:49 +09:00 
Author: https://github.com/LucasChollet
Commit: https://github.com/SerenityOS/serenity/commit/7730b743db
Pull-request: https://github.com/SerenityOS/serenity/pull/23628
Issue: https://github.com/SerenityOS/serenity/issues/23623
Reviewed-by: https://github.com/nico ✅
2 changed files with 22 additions and 1 deletions
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8
Userland/Libraries/LibGfx/ImageFormats/CCITTDecoder.cpp
View File

@ -596,13 +596,19 @@ ErrorOr<ByteBuffer> decode_ccitt_group3(ReadonlyBytes bytes, u32 image_width, u3
// NOTE: For whatever reason, the last EOL doesn't seem to be included
for (u32 i = 0; i < image_height; ++i) {
TRY(read_eol(*bit_stream, options.use_fill_bits));
if (options.require_end_of_line == Group3Options::RequireEndOfLine::Yes)
TRY(read_eol(*bit_stream, options.use_fill_bits));
TRY(decode_single_ccitt3_1d_line(*bit_stream, *decoded_bits, image_width));
if (options.encoded_byte_aligned == Group3Options::EncodedByteAligned::Yes)
bit_stream->align_to_byte_boundary();
}
return decoded_bytes;
}
if (options.require_end_of_line == Group3Options::RequireEndOfLine::No || options.encoded_byte_aligned == Group3Options::EncodedByteAligned::Yes)
return Error::from_string_literal("CCITTDecoder: Unsupported option for CCITT3 2D decoding");
TRY(decode_single_ccitt3_2d_block(*bit_stream, *decoded_bits, image_width, image_height, options.use_fill_bits));
return decoded_bytes;
}

15
Userland/Libraries/LibGfx/ImageFormats/CCITTDecoder.h
View File

@ -43,9 +43,24 @@ struct Group3Options {
Yes = 1,
};
// Addition from the PDF specification
enum class RequireEndOfLine : u8 {
No = 0,
Yes = 1,
};
enum class EncodedByteAligned : u8 {
No = 0,
Yes = 1,
};
Mode dimensions = Mode::OneDimension;
Compression compression = Compression::Compressed;
UseFillBits use_fill_bits = UseFillBits::No;
// Default values are set to be compatible with the CCITT specification
RequireEndOfLine require_end_of_line = RequireEndOfLine::Yes;
EncodedByteAligned encoded_byte_aligned = EncodedByteAligned::No;
};
ErrorOr<ByteBuffer> decode_ccitt_group3(ReadonlyBytes bytes, u32 image_width, u32 image_height, Group3Options const& options);