ui/gfx/geometry/safe_integer_conversions.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef UI_GFX_GEOMETRY_SAFE_INTEGER_CONVERSIONS_H_
   6 #define UI_GFX_GEOMETRY_SAFE_INTEGER_CONVERSIONS_H_
   7
   8 #include <cmath>
   9 #include <limits>
  10
  11 #include "base/numerics/safe_conversions.h"
  12 #include "ui/gfx/gfx_export.h"
  13
  14 namespace gfx {
  15
  16 inline int ToFlooredInt(float value) {
  17   return base::saturated_cast<int>(std::floor(value));
  18 }
  19
  20 inline int ToCeiledInt(float value) {
  21   return base::saturated_cast<int>(std::ceil(value));
  22 }
  23
  24 inline int ToFlooredInt(double value) {
  25   return base::saturated_cast<int>(std::floor(value));
  26 }
  27
  28 inline int ToCeiledInt(double value) {
  29   return base::saturated_cast<int>(std::ceil(value));
  30 }
  31
  32 inline int ToRoundedInt(float value) {
  33   float rounded;
  34   if (value >= 0.0f)
  35     rounded = std::floor(value + 0.5f);
  36   else
  37     rounded = std::ceil(value - 0.5f);
  38   return base::saturated_cast<int>(rounded);
  39 }
  40
  41 inline int ToRoundedInt(double value) {
  42   double rounded;
  43   if (value >= 0.0)
  44     rounded = std::floor(value + 0.5);
  45   else
  46     rounded = std::ceil(value - 0.5);
  47   return base::saturated_cast<int>(rounded);
  48 }
  49
  50 inline bool IsExpressibleAsInt(float value) {
  51   if (value != value)
  52     return false; // no int NaN.
  53   if (value > std::numeric_limits<int>::max())
  54     return false;
  55   if (value < std::numeric_limits<int>::min())
  56     return false;
  57   return true;
  58 }
  59
  60 }  // namespace gfx
  61
  62 #endif  // UI_GFX_GEOMETRY_SAFE_INTEGER_CONVERSIONS_H_