Make much of gfx::Range[F] constexpr.

ui/gfx/range/range_f.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/gfx/range/range_f.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <cmath>
-#include <limits>
 
 #include "base/format_macros.h"
 #include "base/strings/stringprintf.h"
 
 namespace gfx {
 
-RangeF::RangeF()
-    : start_(0.0f),
-      end_(0.0f) {
-}
-
-RangeF::RangeF(float start, float end)
-    : start_(start),
-      end_(end) {
-}
-
-RangeF::RangeF(float position)
-    : start_(position),
-      end_(position) {
-}
-
-// static
-const RangeF RangeF::InvalidRange() {
-  return RangeF(std::numeric_limits<float>::max());
-}
-
-bool RangeF::IsValid() const {
-  return *this != InvalidRange();
-}
-
-float RangeF::GetMin() const {
-  return std::min(start(), end());
-}
-
-float RangeF::GetMax() const {
-  return std::max(start(), end());
-}
-
-bool RangeF::operator==(const RangeF& other) const {
-  return start() == other.start() && end() == other.end();
-}
-
-bool RangeF::operator!=(const RangeF& other) const {
-  return !(*this == other);
-}
-
-bool RangeF::EqualsIgnoringDirection(const RangeF& other) const {
-  return GetMin() == other.GetMin() && GetMax() == other.GetMax();
-}
-
-bool RangeF::Intersects(const RangeF& range) const {
-  return IsValid() && range.IsValid() &&
-      !(range.GetMax() < GetMin() || range.GetMin() >= GetMax());
-}
-
-bool RangeF::Contains(const RangeF& range) const {
-  return IsValid() && range.IsValid() &&
-      GetMin() <= range.GetMin() && range.GetMax() <= GetMax();
-}
-
 RangeF RangeF::Intersect(const RangeF& range) const {
   float min = std::max(GetMin(), range.GetMin());
   float max = std::min(GetMax(), range.GetMax());
 
   if (min >= max)  // No intersection.
     return InvalidRange();
 
   return RangeF(min, max);
 }
 
 RangeF RangeF::Intersect(const Range& range) const {
   RangeF range_f(range.start(), range.end());
   return Intersect(range_f);
 }
 
 Range RangeF::Floor() const {
-  size_t start = start_ > 0.0f ? static_cast<size_t>(std::floor(start_)) : 0;
-  size_t end = end_ > 0.0f ? static_cast<size_t>(std::floor(end_)) : 0;
+  uint32_t start = start_ > 0 ? static_cast<uint32_t>(std::floor(start_)) : 0;
+  uint32_t end = end_ > 0 ? static_cast<uint32_t>(std::floor(end_)) : 0;
   return Range(start, end);
 }
 
 Range RangeF::Ceil() const {
-  size_t start = start_ > 0.0f ? static_cast<size_t>(std::ceil(start_)) : 0;
-  size_t end = end_ > 0.0f ? static_cast<size_t>(std::ceil(end_)) : 0;
+  uint32_t start = start_ > 0 ? static_cast<uint32_t>(std::ceil(start_)) : 0;
+  uint32_t end = end_ > 0 ? static_cast<uint32_t>(std::ceil(end_)) : 0;
   return Range(start, end);
 }
 
 Range RangeF::Round() const {
-  size_t start =
-      start_ > 0.0f ? static_cast<size_t>(std::floor(start_ + 0.5f)) : 0;
-  size_t end = end_ > 0.0f ? static_cast<size_t>(std::floor(end_ + 0.5f)) : 0;
+  uint32_t start = start_ > 0 ? static_cast<uint32_t>(std::round(start_)) : 0;
+  uint32_t end = end_ > 0 ? static_cast<uint32_t>(std::round(end_)) : 0;
   return Range(start, end);
 }
 
 std::string RangeF::ToString() const {
   return base::StringPrintf("{%f,%f}", start(), end());
 }
 
 std::ostream& operator<<(std::ostream& os, const RangeF& range) {
   return os << range.ToString();
 }
 
 }  // namespace gfx