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// Copyright 2022 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_GEOMETRY_CLAMP_FLOAT_GEOMETRY_H_
#define UI_GFX_GEOMETRY_CLAMP_FLOAT_GEOMETRY_H_
#include <limits>
#include "base/numerics/safe_conversions.h"
namespace gfx {
template <typename T>
struct FloatGeometrySaturationHandler {
static constexpr float NaN() { return 0; }
static constexpr float Overflow() { return max(); }
static constexpr float Underflow() { return lowest(); }
static constexpr float max() {
return std::numeric_limits<float>::max() / 1e6;
}
static constexpr float lowest() {
return std::numeric_limits<float>::lowest() / 1e6;
}
};
// Clamps |value| (float, double or long double) within the range of
// [numeric_limits<float>::lowest() / 1e6, numeric_limits<float::max() / 1e6f].
// Returns 0 for NaN. This avoids NaN and infinity values immediately, and
// reduce the chance of producing NaN and infinity values for future unclamped
// operations like offsetting and scaling by devices / page scale factor.
template <typename T>
constexpr float ClampFloatGeometry(T value) {
return base::saturated_cast<float, FloatGeometrySaturationHandler, T>(value);
}
} // namespace gfx
#endif // UI_GFX_GEOMETRY_CLAMP_FLOAT_GEOMETRY_H_
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