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LibGfx/ICC: Add evaluate() member functions to both curve types
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@ -13,6 +13,7 @@
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#include <AK/String.h>
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#include <AK/Vector.h>
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#include <LibGfx/ICC/DistinctFourCC.h>
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#include <math.h>
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namespace Gfx::ICC {
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@ -159,6 +160,26 @@ public:
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// 65 535). Function values between the entries shall be obtained through linear interpolation."
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Vector<u16> const& values() const { return m_values; }
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// x must be in [0..1].
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float evaluate(float x) const
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{
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VERIFY(0.f <= x && x <= 1.f);
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if (values().is_empty())
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return x;
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if (values().size() == 1)
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return powf(x, values()[0] / (float)0x100);
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size_t i = static_cast<size_t>(x * (values().size() - 1));
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if (i == values().size() - 1)
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--i;
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float f = x * (values().size() - 1) - i;
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return (1 - f) * (values()[i] / 65535.f) + f * (values()[i + 1] / 65535.f);
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}
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private:
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Vector<u16> m_values;
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};
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@ -691,6 +712,34 @@ public:
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return m_parameters[6];
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}
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// x must be in [0..1].
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float evaluate(float x) const
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{
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VERIFY(0.f <= x && x <= 1.f);
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switch (function_type()) {
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case FunctionType::Type0:
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return powf(x, (float)g());
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case FunctionType::Type1:
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if (x >= -(float)b() / (float)a())
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return powf((float)a() * x + (float)b(), (float)g());
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return 0;
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case FunctionType::Type2:
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if (x >= -(float)b() / (float)a())
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return powf((float)a() * x + (float)b(), (float)g()) + (float)c();
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return (float)c();
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case FunctionType::Type3:
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if (x >= (float)d())
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return powf((float)a() * x + (float)b(), (float)g());
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return (float)c() * x;
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case FunctionType::Type4:
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if (x >= (float)d())
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return powf((float)a() * x + (float)b(), (float)g()) + (float)e();
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return (float)c() * x + (float)f();
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}
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VERIFY_NOT_REACHED();
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}
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private:
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FunctionType m_function_type;
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