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LibGfx/TIFF: Read and honor the FillOrder tag

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This commit is contained in:
Lucas CHOLLET 2024-01-17 23:34:38 -05:00 • committed by Jelle Raaijmakers
parent 6a0fe08604
commit 720187623b
2 changed files with 27 additions and 2 deletions
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23
Userland/Libraries/LibGfx/ImageFormats/TIFFLoader.cpp
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@ -336,6 +336,25 @@ private:
return {};
}
ErrorOr<ByteBuffer> read_bytes_considering_fill_order(u32 bytes_to_read) const
{
auto const reverse_byte = [](u8 b) {
b = (b & 0xF0) >> 4 | (b & 0x0F) << 4;
b = (b & 0xCC) >> 2 | (b & 0x33) << 2;
b = (b & 0xAA) >> 1 | (b & 0x55) << 1;
return b;
};
auto const bytes = TRY(m_stream->read_in_place<u8 const>(bytes_to_read));
auto copy = TRY(ByteBuffer::copy(bytes));
if (m_metadata.fill_order() == FillOrder::RightToLeft) {
for (auto& byte : copy.bytes())
byte = reverse_byte(byte);
}
return copy;
}
ErrorOr<void> decode_frame_impl()
{
switch (*m_metadata.compression()) {
@ -352,7 +371,7 @@ private:
ByteBuffer decoded_bytes {};
auto decode_ccitt_rle_strip = [&](u32 num_bytes, u32 image_height) -> ErrorOr<ReadonlyBytes> {
auto const encoded_bytes = TRY(m_stream->read_in_place<u8 const>(num_bytes));
auto const encoded_bytes = TRY(read_bytes_considering_fill_order(num_bytes));
decoded_bytes = TRY(CCITT::decode_ccitt_rle(encoded_bytes, *m_metadata.image_width(), image_height));
return decoded_bytes;
};
@ -366,7 +385,7 @@ private:
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));
auto const encoded_bytes = TRY(read_bytes_considering_fill_order(num_bytes));
decoded_bytes = TRY(CCITT::decode_ccitt_group3(encoded_bytes, *m_metadata.image_width(), strip_height, parameters));
return decoded_bytes;
};