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

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Nico Weber 2023-01-23 13:14:20 -05:00 • committed by Linus Groh
parent ea31aba0f4
commit 67f718aa3f
3 changed files with 66 additions and 1 deletions
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30
Userland/Libraries/LibGfx/ICCProfile.h
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@ -258,6 +258,36 @@ public:
}
};
// ICC v4, 10.6 curveType
class CurveTagData : public TagData {
public:
static constexpr TagTypeSignature Type { 0x63757276 }; // 'curv'
static ErrorOr<NonnullRefPtr<CurveTagData>> from_bytes(ReadonlyBytes, u32 offset, u32 size);
CurveTagData(u32 offset, u32 size, Vector<u16> values)
: TagData(offset, size, Type)
, m_values(move(values))
{
}
// "The curveType embodies a one-dimensional function which maps an input value in the domain of the function
// to an output value in the range of the function. The domain and range values are in the range of 0,0 to 1,0.
// - When n is equal to 0, an identity response is assumed.
// - When n is equal to 1, then the curve value shall be interpreted as a gamma value, encoded as a
// u8Fixed8Number. Gamma shall be interpreted as the exponent in the equation y = pow(x,γ) and not as an inverse.
// - When n is greater than 1, the curve values (which embody a sampled one-dimensional function) shall be
// defined as follows:
// - The first entry represents the input value 0,0, the last entry represents the input value 1,0, and intermediate
// entries are uniformly spaced using an increment of 1,0/(n-1). These entries are encoded as uInt16Numbers
// (i.e. the values represented by the entries, which are in the range 0,0 to 1,0 are encoded in the range 0 to
// 65 535). Function values between the entries shall be obtained through linear interpolation."
Vector<u16> const& values() const { return m_values; }
private:
Vector<u16> m_values;
};
// ICC v4, 10.15 multiLocalizedUnicodeType
class MultiLocalizedUnicodeTagData : public TagData {
public: