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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_GFX_SKIA_COLOR_SPACE_UTIL_H_
#define UI_GFX_SKIA_COLOR_SPACE_UTIL_H_
#include "third_party/skia/include/core/SkColorSpace.h"
#include "third_party/skia/include/core/SkM44.h"
#include "third_party/skia/modules/skcms/skcms.h"
#include "ui/gfx/color_space_export.h"
namespace gfx {
// Return the parameterized function in |fn|, evaluated at |x|. This will not
// clamp output values.
// TODO(crbug.com/40944641): Replace this function with
// skcms_TransferFunction_eval.
float COLOR_SPACE_EXPORT
SkTransferFnEvalUnclamped(const skcms_TransferFunction& fn, float x);
// TODO(crbug.com/40944641): Replace this function with
// skcms_TransferFunction_invert.
skcms_TransferFunction COLOR_SPACE_EXPORT
SkTransferFnInverse(const skcms_TransferFunction& fn);
// Return true if `a` and `b` approximately cancel out.
// TODO(crbug.com/40944641): This function determines the result by testing `b`
// after `a` on several points on the unit interval, which is not efficient or
// accurate.
bool COLOR_SPACE_EXPORT
SkTransferFnsApproximatelyCancel(const skcms_TransferFunction& a,
const skcms_TransferFunction& b);
// Returns true if `fn` is approximately the identity.
// TODO(crbug.com/40944641): This function determines the result by testing `fn`
// on several points in the unit interval, which is not efficient or accurate.
bool COLOR_SPACE_EXPORT
SkTransferFnIsApproximatelyIdentity(const skcms_TransferFunction& fn);
// Returns true if `m` is within `epsilon` of the identity in the L-infinity
// sense.
bool COLOR_SPACE_EXPORT SkM44IsApproximatelyIdentity(const SkM44& m,
float epsilon = 1.f /
256.f);
// Convert between skcms and Skia matrices. These assume that the 4th row and
// column of the SkM44 are [0,0,0,1].
skcms_Matrix3x3 COLOR_SPACE_EXPORT SkcmsMatrix3x3FromSkM44(const SkM44& in);
SkM44 COLOR_SPACE_EXPORT SkM44FromSkcmsMatrix3x3(const skcms_Matrix3x3& in);
SkM44 COLOR_SPACE_EXPORT SkM44FromRowMajor3x3(const float* scale);
} // namespace gfx
#endif // UI_GFX_SKIA_COLOR_SPACE_UTIL_H_
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