gamma.h

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//
// Copyright 2016 Pixar
//
// Licensed under the terms set forth in the LICENSE.txt file available at
// https://openusd.org/license.
//
#ifndef PXR_BASE_GF_GAMMA_H
#define PXR_BASE_GF_GAMMA_H

#include "pxr/pxr.h"
#include "pxr/base/gf/api.h"

/// \file gf/gamma.h
/// Utilities to map colors between gamma spaces.

PXR_NAMESPACE_OPEN_SCOPE

class GfVec3f;
class GfVec3d;
class GfVec4f;
class GfVec4d;
class GfVec3h;
class GfVec4h;

/// Return a new vector with each component of \p v raised to the power \p
/// gamma
GF_API
GfVec3f GfApplyGamma(const GfVec3f &v, double gamma);

/// Return a new vector with each component of \p v raised to the power \p
/// gamma
GF_API
GfVec3d GfApplyGamma(const GfVec3d &v, double gamma);

/// \copydoc GfApplyGamma(GfVec3d,double)
GF_API
GfVec3h GfApplyGamma(const GfVec3h &v, double gamma);

/// Return a new vector with the first three components of \p v raised to the
/// power \p gamma and the fourth component unchanged.
GF_API
GfVec4f GfApplyGamma(const GfVec4f &v, double gamma);

/// Return a new vector with the first three components of \p v raised to the
/// power \p gamma and the fourth component unchanged.
GF_API
GfVec4d GfApplyGamma(const GfVec4d &v, double gamma);

/// \copydoc GfApplyGamma(GfVec4h,double)
GF_API
GfVec4h GfApplyGamma(const GfVec4h &v, double gamma);

/// Return a new float raised to the power \p gamma
GF_API
float GfApplyGamma(const float &v, double gamma);

/// Return a new char raised to the power \p gamma
GF_API
unsigned char GfApplyGamma(const unsigned char &v, double gamma);

/// Return the system display gamma
GF_API
double GfGetDisplayGamma();

/// Given a vec, \p v, representing an energy-linear RGB(A) color, return a
/// vec of the same type converted to the system's display gamma.
GF_API GfVec3f GfConvertLinearToDisplay(const GfVec3f &v);
GF_API GfVec3d GfConvertLinearToDisplay(const GfVec3d &v);
GF_API GfVec3h GfConvertLinearToDisplay(const GfVec3h &v);
GF_API GfVec4f GfConvertLinearToDisplay(const GfVec4f &v);
GF_API GfVec4d GfConvertLinearToDisplay(const GfVec4d &v);
GF_API GfVec4h GfConvertLinearToDisplay(const GfVec4h &v);
GF_API float GfConvertLinearToDisplay(const float &v);
GF_API unsigned char GfConvertLinearToDisplay(const unsigned char &v);

/// Given a vec, \p v, representing an RGB(A) color in the system's display
/// gamma space, return an energy-linear vec of the same type.
GF_API GfVec3f GfConvertDisplayToLinear(const GfVec3f &v);
GF_API GfVec3d GfConvertDisplayToLinear(const GfVec3d &v);
GF_API GfVec3h GfConvertDisplayToLinear(const GfVec3h &v);
GF_API GfVec4f GfConvertDisplayToLinear(const GfVec4f &v);
GF_API GfVec4d GfConvertDisplayToLinear(const GfVec4d &v);
GF_API GfVec4h GfConvertDisplayToLinear(const GfVec4h &v);
GF_API float GfConvertDisplayToLinear(const float &v);
GF_API unsigned char GfConvertDisplayToLinear(const unsigned char &v);

PXR_NAMESPACE_CLOSE_SCOPE

#endif // PXR_BASE_GF_GAMMA_H