floating_point.h

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// Copyright 2013 The Flutter 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 FLUTTER_LIB_UI_FLOATING_POINT_H_
#define FLUTTER_LIB_UI_FLOATING_POINT_H_
 
#include <algorithm>
#include <limits>
 
namespace flutter {
 
/// Converts a double to a float, truncating finite values that are larger than
/// FLT_MAX or smaller than FLT_MIN to those values.
static float SafeNarrow(double value) {
  if (std::isinf(value) || std::isnan(value)) {
    return static_cast<float>(value);
  } else {
    // Avoid truncation to inf/-inf.
    return std::clamp(static_cast<float>(value),
                      std::numeric_limits<float>::lowest(),
                      std::numeric_limits<float>::max());
  }
}
 
}  // namespace flutter
 
#endif  // FLUTTER_LIB_UI_FLOATING_POINT_H_