nsPoint.h
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef NSPOINT_H
#define NSPOINT_H
#include "nsCoord.h"
#include "mozilla/gfx/BaseSize.h"
#include "mozilla/gfx/BasePoint.h"
#include "nsSize.h"
struct nsIntPoint;
struct nsPoint : public mozilla::gfx::BasePoint<nscoord, nsPoint> {
typedef mozilla::gfx::BasePoint<nscoord, nsPoint> Super;
nsPoint() : Super() {}
nsPoint(const nsPoint& aPoint) : Super(aPoint) {}
nsPoint(nscoord aX, nscoord aY) : Super(aX, aY) {}
inline nsIntPoint ScaleToNearestPixels(float aXScale, float aYScale,
nscoord aAppUnitsPerPixel) const;
inline nsIntPoint ToNearestPixels(nscoord aAppUnitsPerPixel) const;
// Converts this point from aFromAPP, an appunits per pixel ratio, to aToAPP.
inline nsPoint ConvertAppUnits(int32_t aFromAPP, int32_t aToAPP) const;
};
struct nsIntPoint : public mozilla::gfx::BasePoint<int32_t, nsIntPoint> {
typedef mozilla::gfx::BasePoint<int32_t, nsIntPoint> Super;
nsIntPoint() : Super() {}
nsIntPoint(const nsIntPoint& aPoint) : Super(aPoint) {}
nsIntPoint(int32_t aX, int32_t aY) : Super(aX, aY) {}
inline nsPoint ToAppUnits(nscoord aAppUnitsPerPixel) const;
};
inline nsIntPoint
nsPoint::ScaleToNearestPixels(float aXScale, float aYScale,
nscoord aAppUnitsPerPixel) const
{
return nsIntPoint(
NSToIntRoundUp(NSAppUnitsToDoublePixels(x, aAppUnitsPerPixel) * aXScale),
NSToIntRoundUp(NSAppUnitsToDoublePixels(y, aAppUnitsPerPixel) * aYScale));
}
inline nsIntPoint
nsPoint::ToNearestPixels(nscoord aAppUnitsPerPixel) const
{
return ScaleToNearestPixels(1.0f, 1.0f, aAppUnitsPerPixel);
}
inline nsPoint
nsPoint::ConvertAppUnits(int32_t aFromAPP, int32_t aToAPP) const
{
if (aFromAPP != aToAPP) {
nsPoint point;
point.x = NSToCoordRound(NSCoordScale(x, aFromAPP, aToAPP));
point.y = NSToCoordRound(NSCoordScale(y, aFromAPP, aToAPP));
return point;
}
return *this;
}
// app units are integer multiples of pixels, so no rounding needed
inline nsPoint
nsIntPoint::ToAppUnits(nscoord aAppUnitsPerPixel) const
{
return nsPoint(NSIntPixelsToAppUnits(x, aAppUnitsPerPixel),
NSIntPixelsToAppUnits(y, aAppUnitsPerPixel));
}
#endif /* NSPOINT_H */