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LibGfx: Implement serialization of ParametricCurveTagData

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With this, simple v4 matrix profiles using parametric curves, such as
Compact-ICC-Profiles/profiles/sRGB-v4.icc, can be completely serialized
and the serialized file can be read again by `icc` :^)
This commit is contained in:
Nico Weber 2023-02-17 20:56:24 -05:00 • committed by Andreas Kling
parent 685e2da302
commit ececea9a1c
2 changed files with 26 additions and 0 deletions
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19
Userland/Libraries/LibGfx/ICC/BinaryWriter.cpp
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@ -60,6 +60,23 @@ static ErrorOr<ByteBuffer> encode_multi_localized_unicode(MultiLocalizedUnicodeT
return bytes;
}
static ErrorOr<ByteBuffer> encode_parametric_curve(ParametricCurveTagData const& tag_data)
{
// ICC v4, 10.18 parametricCurveType
auto bytes = TRY(ByteBuffer::create_uninitialized(2 * sizeof(u32) + 2 * sizeof(u16) + tag_data.parameter_count() * sizeof(s15Fixed16Number)));
*bit_cast<BigEndian<u32>*>(bytes.data()) = (u32)ParametricCurveTagData::Type;
*bit_cast<BigEndian<u32>*>(bytes.data() + 4) = 0;
*bit_cast<BigEndian<u16>*>(bytes.data() + 8) = (u16)tag_data.function_type();
*bit_cast<BigEndian<u16>*>(bytes.data() + 10) = 0;
auto* parameters = bit_cast<BigEndian<s15Fixed16Number>*>(bytes.data() + 12);
for (size_t i = 0; i < tag_data.parameter_count(); ++i)
parameters[i] = tag_data.parameter(i).raw();
return bytes;
}
static ErrorOr<ByteBuffer> encode_s15_fixed_array(S15Fixed16ArrayTagData const& tag_data)
{
// ICC v4, 10.22 s15Fixed16ArrayType
@ -93,6 +110,8 @@ static ErrorOr<ByteBuffer> encode_tag_data(TagData const& tag_data)
switch (tag_data.type()) {
case MultiLocalizedUnicodeTagData::Type:
return encode_multi_localized_unicode(static_cast<MultiLocalizedUnicodeTagData const&>(tag_data));
case ParametricCurveTagData::Type:
return encode_parametric_curve(static_cast<ParametricCurveTagData const&>(tag_data));
case S15Fixed16ArrayTagData::Type:
return encode_s15_fixed_array(static_cast<S15Fixed16ArrayTagData const&>(tag_data));
case XYZTagData::Type: