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// Copyright (c) the JPEG XL Project Authors. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#ifndef LIB_JXL_ENC_GAMMA_CORRECT_H_
#define LIB_JXL_ENC_GAMMA_CORRECT_H_
// Deprecated: sRGB transfer function. Use JxlCms instead.
#include <cmath>
#include "lib/jxl/base/compiler_specific.h"
namespace jxl {
// Values are in [0, 1].
static JXL_INLINE double Srgb8ToLinearDirect(double srgb) {
if (srgb <= 0.0) return 0.0;
if (srgb <= 0.04045) return srgb / 12.92;
if (srgb >= 1.0) return 1.0;
return std::pow((srgb + 0.055) / 1.055, 2.4);
}
// Values are in [0, 1].
static JXL_INLINE double LinearToSrgb8Direct(double linear) {
if (linear <= 0.0) return 0.0;
if (linear >= 1.0) return 1.0;
if (linear <= 0.0031308) return linear * 12.92;
return std::pow(linear, 1.0 / 2.4) * 1.055 - 0.055;
}
} // namespace jxl
#endif // LIB_JXL_ENC_GAMMA_CORRECT_H_