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LibGfx/TIFF: Add support for images with PackBits compression

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This commit is contained in:
Lucas CHOLLET 2023-10-29 17:02:45 -04:00 • committed by Andreas Kling
parent ed8d82f3de
commit 81794df280
3 changed files with 55 additions and 1 deletions
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44
Userland/Libraries/LibGfx/ImageFormats/TIFFLoader.cpp
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@ -130,8 +130,50 @@ private:
case Compression::NoCompression:
TRY(loop_over_pixels([this]() { return read_value<u8>(); }));
break;
case Compression::PackBits: {
// Section 9: PackBits Compression
Optional<i8> n;
Optional<u8> saved_byte;
auto read_packed_byte = [&]() -> ErrorOr<u8> {
while (true) {
if (!n.has_value())
n = TRY(read_value<i8>());
if (n.value() >= 0 && !saved_byte.has_value()) {
n.value() = n.value() - 1;
if (n.value() == -1)
n.clear();
return read_value<u8>();
}
if (n.value() == -128) {
n.clear();
continue;
}
if (!saved_byte.has_value())
saved_byte = TRY(read_value<u8>());
n.value() = n.value() + 1;
auto const byte_backup = *saved_byte;
if (n == 1) {
saved_byte.clear();
n.clear();
}
return byte_backup;
}
};
TRY(loop_over_pixels(move(read_packed_byte)));
break;
}
default:
return Error::from_string_literal("Compressed TIFF are not supported yet :^)");
return Error::from_string_literal("This compression type is not supported yet :^)");
}
return {};