Fixup a bug about SVG text selection.

Source/platform/geometry/FloatRect.cpp

 /*
  * Copyright (C) 2003, 2006, 2007 Apple Inc.  All rights reserved.
  * Copyright (C) 2005 Nokia.  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
@@ skipping 144 matching lines @@
 }
 
 void FloatRect::scale(float sx, float sy)
 {
     m_location.setX(x() * sx);
     m_location.setY(y() * sy);
     m_size.setWidth(width() * sx);
     m_size.setHeight(height() * sy);
 }
 
+float FloatRect::distanceFromPoint(const FloatPoint& p)

[fs, 2015/04/27 13:02:17]

squaredDistance...

This is probably a bit to specialized ATM, so we could as well have this as a
static helper function in LayoutSVGInlineText.cpp.

+{
+    float closestX, closestY;

[fs, 2015/04/27 13:02:17]

If you made this a FloatPoint, you wouldn't need to open-code as much (could use
operator- and diagonalLengthSquared.)

+    closestX = std::max(std::min(p.x(), maxX()), x());
+    closestY = std::max(std::min(p.y(), maxY()), y());
+    return powf(p.x() - closestX, 2) + powf(p.y() - closestY, 2);
+}
+
 FloatRect unionRect(const Vector<FloatRect>& rects)
 {
     FloatRect result;
 
     size_t count = rects.size();
     for (size_t i = 0; i < count; ++i)
         result.unite(rects[i]);
 
     return result;
 }
@@ skipping 34 matching lines @@
         return FloatRect();
 
     float widthScale = destRect.width() / srcRect.width();
     float heightScale = destRect.height() / srcRect.height();
     return FloatRect(destRect.x() + (r.x() - srcRect.x()) * widthScale,
         destRect.y() + (r.y() - srcRect.y()) * heightScale,
         r.width() * widthScale, r.height() * heightScale);
 }
 
 }