gfx/thebes/gfxPoint.h

   1 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
   2  * This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #ifndef GFX_POINT_H
   7 #define GFX_POINT_H
   8
   9 #include "nsMathUtils.h"
  10 #include "mozilla/gfx/BaseSize.h"
  11 #include "mozilla/gfx/BasePoint.h"
  12 #include "nsSize.h"
  13 #include "nsPoint.h"
  14
  15 #include "gfxTypes.h"
  16
  17 struct gfxSize : public mozilla::gfx::BaseSize<gfxFloat, gfxSize> {
  18     typedef mozilla::gfx::BaseSize<gfxFloat, gfxSize> Super;
  19
  20     gfxSize() : Super() {}
  21     gfxSize(gfxFloat aWidth, gfxFloat aHeight) : Super(aWidth, aHeight) {}
  22     gfxSize(const nsIntSize& aSize) : Super(aSize.width, aSize.height) {}
  23 };
  24
  25 struct gfxPoint : public mozilla::gfx::BasePoint<gfxFloat, gfxPoint> {
  26     typedef mozilla::gfx::BasePoint<gfxFloat, gfxPoint> Super;
  27
  28     gfxPoint() : Super() {}
  29     gfxPoint(gfxFloat aX, gfxFloat aY) : Super(aX, aY) {}
  30     gfxPoint(const nsIntPoint& aPoint) : Super(aPoint.x, aPoint.y) {}
  31
  32     // Round() is *not* rounding to nearest integer if the values are negative.
  33     // They are always rounding as floor(n + 0.5).
  34     // See https://bugzilla.mozilla.org/show_bug.cgi?id=410748#c14
  35     gfxPoint& Round() {
  36         x = floor(x + 0.5);
  37         y = floor(y + 0.5);
  38         return *this;
  39     }
  40
  41     bool WithinEpsilonOf(const gfxPoint& aPoint, gfxFloat aEpsilon) {
  42         return fabs(aPoint.x - x) < aEpsilon && fabs(aPoint.y - y) < aEpsilon;
  43     }
  44 };
  45
  46 inline gfxPoint
  47 operator*(const gfxPoint& aPoint, const gfxSize& aSize)
  48 {
  49   return gfxPoint(aPoint.x * aSize.width, aPoint.y * aSize.height);
  50 }
  51
  52 inline gfxPoint
  53 operator/(const gfxPoint& aPoint, const gfxSize& aSize)
  54 {
  55   return gfxPoint(aPoint.x / aSize.width, aPoint.y / aSize.height);
  56 }
  57
  58 inline gfxSize
  59 operator/(gfxFloat aValue, const gfxSize& aSize)
  60 {
  61   return gfxSize(aValue / aSize.width, aValue / aSize.height);
  62 }
  63
  64 #endif /* GFX_POINT_H */