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LibGfx/TIFF: Make TIFFLoadingContext::handle_tag be a free function

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And move it to another file. This code is going to be generated soon, so
let's put it in another file.
This commit is contained in:
Lucas CHOLLET 2023-11-12 18:34:37 -05:00 • committed by Sam Atkins
parent 34d91dec5b
commit 4ab2903e25
4 changed files with 171 additions and 153 deletions
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154
Userland/Libraries/LibGfx/ImageFormats/TIFFLoader.cpp
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@ -416,159 +416,7 @@ private:
}
}
TRY(handle_tag(tag, type, count, tiff_value));
return {};
}
ErrorOr<void> handle_tag(u16 tag, Type type, u32 count, Vector<Value> const& value)
{
// FIXME: Make that easy to extend
switch (tag) {
case 256:
// ImageWidth
if ((type != Type::UnsignedShort && type != Type::UnsignedLong) || count != 1)
return Error::from_string_literal("TIFFImageDecoderPlugin: Invalid tag 256");
value[0].visit(
[this]<OneOf<u16, u32> T>(T const& width) {
m_metadata.size.set_width(width);
},
[&](auto const&) {
VERIFY_NOT_REACHED();
});
break;
case 257:
// ImageLength
if ((type != Type::UnsignedShort && type != Type::UnsignedLong) || count != 1)
return Error::from_string_literal("TIFFImageDecoderPlugin: Invalid tag 257");
value[0].visit(
[this]<OneOf<u16, u32> T>(T const& width) {
m_metadata.size.set_height(width);
},
[&](auto const&) {
VERIFY_NOT_REACHED();
});
break;
case 258:
// BitsPerSample
if (type != Type::UnsignedShort || count != 3)
return Error::from_string_literal("TIFFImageDecoderPlugin: Invalid tag 258");
for (u8 i = 0; i < m_metadata.bits_per_sample.size(); ++i) {
value[i].visit(
[this, i](u16 const& bits_per_sample) {
m_metadata.bits_per_sample[i] = bits_per_sample;
},
[&](auto const&) {
VERIFY_NOT_REACHED();
});
}
break;
case 259:
// Compression
if (type != Type::UnsignedShort || count != 1)
return Error::from_string_literal("TIFFImageDecoderPlugin: Invalid tag 259");
TRY(value[0].visit(
[this](u16 const& compression) -> ErrorOr<void> {
if (compression > 6 && compression != to_underlying(Compression::PackBits))
return Error::from_string_literal("TIFFImageDecoderPlugin: Invalid compression value");
m_metadata.compression = static_cast<Compression>(compression);
return {};
},
[&](auto const&) -> ErrorOr<void> {
VERIFY_NOT_REACHED();
}));
break;
case 273:
// StripOffsets
if (type != Type::UnsignedShort && type != Type::UnsignedLong)
return Error::from_string_literal("TIFFImageDecoderPlugin: Invalid tag 273");
TRY(m_metadata.strip_offsets.try_ensure_capacity(count));
for (u32 i = 0; i < count; ++i) {
value[i].visit(
[this]<OneOf<u16, u32> T>(T const& offset) {
m_metadata.strip_offsets.append(offset);
},
[&](auto const&) {
VERIFY_NOT_REACHED();
});
}
break;
case 277:
// SamplesPerPixel
if (type != Type::UnsignedShort || count != 1)
return Error::from_string_literal("TIFFImageDecoderPlugin: Invalid tag 277");
TRY(value[0].visit(
[](u16 const& samples_per_pixels) -> ErrorOr<void> {
if (samples_per_pixels != 3)
return Error::from_string_literal("TIFFImageDecoderPlugin: Invalid tag 277");
return {};
},
[&](auto const&) -> ErrorOr<void> {
VERIFY_NOT_REACHED();
}));
break;
case 278:
// RowsPerStrip
if ((type != Type::UnsignedShort && type != Type::UnsignedLong) || count != 1)
return Error::from_string_literal("TIFFImageDecoderPlugin: Invalid tag 278");
value[0].visit(
[this]<OneOf<u16, u32> T>(T const& rows_per_strip) {
m_metadata.rows_per_strip = rows_per_strip;
},
[&](auto const&) {
VERIFY_NOT_REACHED();
});
break;
case 279:
// StripByteCounts
if (type != Type::UnsignedShort && type != Type::UnsignedLong)
return Error::from_string_literal("TIFFImageDecoderPlugin: Invalid tag 279");
TRY(m_metadata.strip_bytes_count.try_ensure_capacity(count));
for (u32 i = 0; i < count; ++i) {
value[i].visit(
[this]<OneOf<u16, u32> T>(T const& offset) {
m_metadata.strip_bytes_count.append(offset);
},
[&](auto const&) {
VERIFY_NOT_REACHED();
});
}
break;
case 317:
// Predictor
if (type != Type::UnsignedShort || count != 1)
return Error::from_string_literal("TIFFImageDecoderPlugin: Invalid tag 317");
TRY(value[0].visit(
[this](u16 const& predictor) -> ErrorOr<void> {
if (predictor != 1 && predictor != 2)
return Error::from_string_literal("TIFFImageDecoderPlugin: Invalid predictor value");
m_metadata.predictor = static_cast<Predictor>(predictor);
return {};
},
[&](auto const&) -> ErrorOr<void> {
VERIFY_NOT_REACHED();
}));
break;
default:
dbgln_if(TIFF_DEBUG, "Unknown tag: {}", tag);
}
TRY(handle_tag(m_metadata, tag, type, count, tiff_value));
return {};
}