Change HarfBuzzShaper to use FloatBoxExtent for glyp bounds

Source/platform/geometry/FloatBoxExtent.h

 /*
  * Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above
  *    copyright notice, this list of conditions and the following
  *    disclaimer.
  * 2. Redistributions in binary form must reproduce the above
  *    copyright notice, this list of conditions and the following
  *    disclaimer in the documentation and/or other materials
  *    provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER “AS IS” AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
  * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
  * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
  * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */
 
-#ifndef IntRectExtent_h
-#define IntRectExtent_h
+#ifndef FloatBoxExtent_h
+#define FloatBoxExtent_h
 
-#include "platform/geometry/LayoutRect.h"
+#include "platform/geometry/FloatRect.h"
 
 namespace WebCore {
 
-class IntRectExtent {
+class FloatBoxExtent {
 public:
-    IntRectExtent()
+    FloatBoxExtent()
         : m_top(0)
         , m_right(0)
         , m_bottom(0)
         , m_left(0)
     {
     }
 
-    IntRectExtent(int top, int right, int bottom, int left)
+    FloatBoxExtent(float top, float right, float bottom, float left)
         : m_top(top)
         , m_right(right)
         , m_bottom(bottom)
         , m_left(left)
     {
     }
 
-    int top() const { return m_top; }
-    void setTop(int top) { m_top = top; }
+    float top() const { return m_top; }
+    void setTop(float top) { m_top = top; }
 
-    int right() const { return m_right; }
-    void setRight(int right) { m_right = right; }
+    float right() const { return m_right; }
+    void setRight(float right) { m_right = right; }
 
-    int bottom() const { return m_bottom; }
-    void setBottom(int bottom) { m_bottom = bottom; }
+    float bottom() const { return m_bottom; }
+    void setBottom(float bottom) { m_bottom = bottom; }
 
-    int left() const { return m_left; }
-    void setLeft(int left) { m_left = left; }
+    float left() const { return m_left; }
+    void setLeft(float left) { m_left = left; }
 
     bool isZero() const { return !left() && !right() && !top() && !bottom(); }
 
-    void expandRect(LayoutRect& rect) const
+    void expandRect(FloatRect& rect) const
     {
         if (isZero())
             return;
 
         rect.move(-left(), -top());
         rect.expand(left() + right(), top() + bottom());
     }
 
+    void unite(const FloatBoxExtent& other)
+    {
+        m_top = std::min(m_top, other.top());
+        m_right = std::max(m_right, other.right());
+        m_bottom = std::max(m_bottom, other.bottom());
+        m_left = std::min(m_left, other.left());
+    }
+
+    void unite(const FloatRect& rect)
+    {
+        m_top = std::min(m_top, rect.y());
+        m_right = std::max(m_right, rect.maxX());
+        m_bottom = std::max(m_bottom, rect.maxY());
+        m_left = std::min(m_left, rect.x());
+    }
+
 private:
-    int m_top;
-    int m_right;
-    int m_bottom;
-    int m_left;
+    float m_top;
+    float m_right;
+    float m_bottom;
+    float m_left;
 };
 
-inline bool operator==(const IntRectExtent& a, const IntRectExtent& b)
+inline bool operator==(const FloatBoxExtent& a, const FloatBoxExtent& b)
 {
     return a.top() == b.top()
         && a.right() == b.right()
         && a.bottom() == b.bottom()
         && a.left() == b.left();
 }
 
-inline bool operator!=(const IntRectExtent& a, const IntRectExtent& b)
+inline bool operator!=(const FloatBoxExtent& a, const FloatBoxExtent& b)
 {
     return !(a == b);
 }
 
-inline void operator+=(IntRectExtent& a, const IntRectExtent& b)
+inline void operator+=(FloatBoxExtent& a, const FloatBoxExtent& b)
 {
     a.setTop(a.top() + b.top());
     a.setRight(a.right() + b.right());
     a.setBottom(a.bottom() + b.bottom());
     a.setLeft(a.left() + b.left());
 }
 
 } // namespace WebCore
 
 
-#endif // IntRectExtent_h
+#endif // FloatBoxExtent_h