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LibPDF: Plug in the CCITT3 1D decoder and pass corresponding options

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This commit is contained in:
Lucas CHOLLET 2024-03-18 13:27:52 -04:00 • committed by Andreas Kling
parent 7730b743db
commit 1e023a589d
1 changed files with 11 additions and 5 deletions
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16
Userland/Libraries/LibPDF/Filter.cpp
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@ -317,16 +317,22 @@ PDFErrorOr<ByteBuffer> Filter::decode_ccitt(ReadonlyBytes bytes, RefPtr<DictObje
// achieve to decode images that have it. Figure out what to do with it.
(void)end_of_block;
if (require_end_of_line || encoded_byte_align || damaged_rows_before_error > 0)
if (require_end_of_line || (encoded_byte_align && k != 0) || damaged_rows_before_error > 0)
return Error::rendering_unsupported_error("Unimplemented option for the CCITTFaxDecode Filter");
ByteBuffer decoded {};
if (k < 0)
if (k < 0) {
decoded = TRY(Gfx::CCITT::decode_ccitt_group4(bytes, columns, rows));
else if (k == 0)
return Error::rendering_unsupported_error("CCITTFaxDecode Filter Group 3, 1-D is unsupported");
else
} else if (k == 0) {
Gfx::CCITT::Group3Options options {
.require_end_of_line = require_end_of_line ? Gfx::CCITT::Group3Options::RequireEndOfLine::Yes : Gfx::CCITT::Group3Options::RequireEndOfLine::No,
.encoded_byte_aligned = encoded_byte_align ? Gfx::CCITT::Group3Options::EncodedByteAligned::Yes : Gfx::CCITT::Group3Options::EncodedByteAligned::No,
};
decoded = TRY(Gfx::CCITT::decode_ccitt_group3(bytes, columns, rows, options));
} else {
return Error::rendering_unsupported_error("CCITTFaxDecode Filter Group 3, 2-D is unsupported");
}
if (!black_is_1)
invert_bits(decoded);