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LibGfx+icc: Add ICCProfile support for parametricCurveType and print it

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With this, we can parse all types required in v4
"Three-component matrix-based Input profiles".
This commit is contained in:
Nico Weber 2023-01-23 13:55:57 -05:00 • committed by Linus Groh
parent 67f718aa3f
commit fa00d94e82
3 changed files with 172 additions and 2 deletions
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93
Userland/Libraries/LibGfx/ICCProfile.h
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@ -224,6 +224,8 @@ private:
u64 m_bits = 0;
};
using S15Fixed16 = FixedPoint<16, i32>;
struct XYZ {
double x { 0 };
double y { 0 };
@ -313,13 +315,100 @@ private:
Vector<Record> m_records;
};
// ICC v4, 10.18 parametricCurveType
class ParametricCurveTagData : public TagData {
public:
// Table 68 — parametricCurveType function type encoding
enum class FunctionType {
// Y = X**g
Type0,
// Y = (a*X + b)**g if X >= -b/a
// = 0 else
Type1,
CIE_122_1966 = Type1,
// Y = (a*X + b)**g + c if X >= -b/a
// = c else
Type2,
IEC_61966_1 = Type2,
// Y = (a*X + b)**g if X >= d
// = c*X else
Type3,
IEC_61966_2_1 = Type3,
sRGB = Type3,
// Y = (a*X + b)**g + e if X >= d
// = c*X + f else
Type4,
};
// "The domain and range of each function shall be [0,0 1,0]. Any function value outside the range shall be clipped
// to the range of the function."
// "NOTE 1 The parameters selected for a parametric curve can result in complex or undefined values for the input range
// used. This can occur, for example, if d < -b/a. In such cases the behaviour of the curve is undefined."
static constexpr TagTypeSignature Type { 0x70617261 }; // 'para'
static ErrorOr<NonnullRefPtr<ParametricCurveTagData>> from_bytes(ReadonlyBytes, u32 offset, u32 size);
ParametricCurveTagData(u32 offset, u32 size, FunctionType function_type, Array<S15Fixed16, 7> parameters)
: TagData(offset, size, Type)
, m_function_type(function_type)
, m_parameters(move(parameters))
{
}
FunctionType function_type() const { return m_function_type; }
static unsigned parameter_count(FunctionType);
S15Fixed16 g() const { return m_parameters[0]; }
S15Fixed16 a() const
{
VERIFY(function_type() >= FunctionType::Type1);
return m_parameters[1];
}
S15Fixed16 b() const
{
VERIFY(function_type() >= FunctionType::Type1);
return m_parameters[2];
}
S15Fixed16 c() const
{
VERIFY(function_type() >= FunctionType::Type2);
return m_parameters[3];
}
S15Fixed16 d() const
{
VERIFY(function_type() >= FunctionType::Type3);
return m_parameters[4];
}
S15Fixed16 e() const
{
VERIFY(function_type() >= FunctionType::Type4);
return m_parameters[5];
}
S15Fixed16 f() const
{
VERIFY(function_type() >= FunctionType::Type4);
return m_parameters[6];
}
private:
FunctionType m_function_type;
// Contains, in this order, g a b c d e f.
// Not all FunctionTypes use all parameters.
Array<S15Fixed16, 7> m_parameters;
};
// ICC v4, 10.22 s15Fixed16ArrayType
class S15Fixed16ArrayTagData : public TagData {
public:
static constexpr TagTypeSignature Type { 0x73663332 }; // 'sf32'
using S15Fixed16 = FixedPoint<16, i32>;
static ErrorOr<NonnullRefPtr<S15Fixed16ArrayTagData>> from_bytes(ReadonlyBytes, u32 offset, u32 size);
S15Fixed16ArrayTagData(u32 offset, u32 size, Vector<S15Fixed16, 9> values)