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LibGfx/TIFF+CCITT: Start to decode CCITT Group 3 images

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We currently only support 1D Group 3, but that's a start.

The test case was generated with GIMP (it happens to be 1D by chance).
This commit is contained in:
Lucas CHOLLET 2024-01-15 00:56:21 -05:00 • committed by Andreas Kling
parent 1cc10a6245
commit 75d87ccf5f
5 changed files with 66 additions and 0 deletions
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14
Userland/Libraries/LibGfx/ImageFormats/TIFFLoader.cpp
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@ -314,6 +314,20 @@ private:
TRY(loop_over_pixels(move(decode_ccitt_rle_strip)));
break;
}
case Compression::Group3Fax: {
TRY(ensure_tags_are_correct_for_ccitt());
auto const parameters = parse_t4_options(*m_metadata.t4_options());
ByteBuffer decoded_bytes {};
auto decode_group3_strip = [&](u32 num_bytes, u32 strip_height) -> ErrorOr<ReadonlyBytes> {
auto const encoded_bytes = TRY(m_stream->read_in_place<u8 const>(num_bytes));
decoded_bytes = TRY(CCITT::decode_ccitt_group3(encoded_bytes, *m_metadata.image_width(), strip_height, parameters));
return decoded_bytes;
};
TRY(loop_over_pixels(move(decode_group3_strip)));
break;
}
case Compression::LZW: {
ByteBuffer decoded_bytes {};
auto decode_lzw_strip = [&](u32 num_bytes, u32) -> ErrorOr<ReadonlyBytes> {