Floating point based Point/Size/Rect and Insets

ui/gfx/point_f.h

Index: ui/gfx/point_f.h
diff --git a/ui/gfx/point_f.h b/ui/gfx/point_f.h
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+// Copyright (c) 2012 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.
+
+#ifndef UI_GFX_POINT_F_H_
+#define UI_GFX_POINT_F_H_
+#pragma once
+
+#include <string>
+
+#include "build/build_config.h"
+#include "ui/base/ui_export.h"
+
+#if !defined(ENABLE_DIP)
+#error "This class should be used only when DIP feature is enabled"
+#endif
+
+namespace gfx {
+class Point;
+
+// A floating versino of gfx::Point. This is copied, instead of using
+// template, to avoid conflict with m19 branch.
+// TODO(oshima): Merge this to ui/gfx/point.h using template.
+class UI_EXPORT PointF {
+ public:
+  PointF();
+  PointF(float x, float y);
+  PointF(Point& point);
+  ~PointF() {}
+
+  float x() const { return x_; }
+  float y() const { return y_; }
+
+  void SetPoint(float x, float y) {
+    x_ = x;
+    y_ = y;
+  }
+
+  void set_x(float x) { x_ = x; }
+  void set_y(float y) { y_ = y; }
+
+  void Offset(float delta_x, float delta_y) {
+    x_ += delta_x;
+    y_ += delta_y;
+  }
+
+  PointF Add(const PointF& other) const{
+    PointF copy = *this;
+    copy.Offset(other.x_, other.y_);
+    return copy;
+  }
+
+  PointF Subtract(const PointF& other) const {
+    PointF copy = *this;
+    copy.Offset(-other.x_, -other.y_);
+    return copy;
+  }
+
+  PointF Middle(const PointF& other) const {
+    return PointF((x_ + other.x_) / 2, (y_ + other.y_) / 2);
+  }
+
+  bool operator==(const PointF& rhs) const {
+    return x_ == rhs.x_ && y_ == rhs.y_;
+  }
+
+  bool operator!=(const PointF& rhs) const {
+    return !(*this == rhs);
+  }
+
+  // A point is less than another point if its y-value is closer
+  // to the origin. If the y-values are the same, then point with
+  // the x-value closer to the origin is considered less than the
+  // other.
+  // This comparison is required to use Points in sets, or sorted
+  // vectors.
+  bool operator<(const PointF& rhs) const {
+    return (y_ == rhs.y_) ? (x_ < rhs.x_) : (y_ < rhs.y_);
+  }
+
+  Point ToPoint() const;
+
+  // Returns a string representation of point.
+  std::string ToString() const;
+
+ private:
+  float x_;
+  float y_;
+};
+
+}  // namespace gfx
+
+#endif  // UI_GFX_POINT_F_H_