gecko/gfx/2d/BasePoint.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Corporation code.
*
* The Initial Developer of the Original Code is Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2011
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Robert O'Callahan <robert@ocallahan.org>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef MOZILLA_GFX_BASEPOINT_H_
#define MOZILLA_GFX_BASEPOINT_H_
namespace mozilla {
namespace gfx {
/**
* Do not use this class directly. Subclass it, pass that subclass as the
* Sub parameter, and only use that subclass. This allows methods to safely
* cast 'this' to 'Sub*'.
*/
template <class T, class Sub>
struct BasePoint {
T x, y;
// Constructors
BasePoint() : x(0), y(0) {}
BasePoint(T aX, T aY) : x(aX), y(aY) {}
void MoveTo(T aX, T aY) { x = aX; y = aY; }
void MoveBy(T aDx, T aDy) { x += aDx; y += aDy; }
// Note that '=' isn't defined so we'll get the
// compiler generated default assignment operator
bool operator==(const Sub& aPoint) const {
return x == aPoint.x && y == aPoint.y;
}
bool operator!=(const Sub& aPoint) const {
return x != aPoint.x || y != aPoint.y;
}
Sub operator+(const Sub& aPoint) const {
return Sub(x + aPoint.x, y + aPoint.y);
}
Sub operator-(const Sub& aPoint) const {
return Sub(x - aPoint.x, y - aPoint.y);
}
Sub& operator+=(const Sub& aPoint) {
x += aPoint.x;
y += aPoint.y;
return *static_cast<Sub*>(this);
}
Sub& operator-=(const Sub& aPoint) {
x -= aPoint.x;
y -= aPoint.y;
return *static_cast<Sub*>(this);
}
Sub operator*(T aScale) const {
return Sub(x * aScale, y * aScale);
}
Sub operator/(T aScale) const {
return Sub(x / aScale, y / aScale);
}
Sub operator-() const {
return Sub(-x, -y);
}
};
}
}
#endif /* MOZILLA_GFX_BASEPOINT_H_ */