michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifndef NSPOINT_H
michael@0: #define NSPOINT_H
michael@0: 
michael@0: #include "nsCoord.h"
michael@0: #include "mozilla/gfx/BaseSize.h"
michael@0: #include "mozilla/gfx/BasePoint.h"
michael@0: #include "nsSize.h"
michael@0: 
michael@0: struct nsIntPoint;
michael@0: 
michael@0: // nsPoint represents a point in app units.
michael@0: 
michael@0: struct nsPoint : public mozilla::gfx::BasePoint<nscoord, nsPoint> {
michael@0:   typedef mozilla::gfx::BasePoint<nscoord, nsPoint> Super;
michael@0: 
michael@0:   nsPoint() : Super() {}
michael@0:   nsPoint(const nsPoint& aPoint) : Super(aPoint) {}
michael@0:   nsPoint(nscoord aX, nscoord aY) : Super(aX, aY) {}
michael@0: 
michael@0:   inline nsIntPoint ScaleToNearestPixels(float aXScale, float aYScale,
michael@0:                                          nscoord aAppUnitsPerPixel) const;
michael@0:   inline nsIntPoint ToNearestPixels(nscoord aAppUnitsPerPixel) const;
michael@0: 
michael@0:   // Converts this point from aFromAPP, an appunits per pixel ratio, to aToAPP.
michael@0:   inline nsPoint ConvertAppUnits(int32_t aFromAPP, int32_t aToAPP) const;
michael@0: };
michael@0: 
michael@0: // nsIntPoint represents a point in one of the types of pixels.
michael@0: // Uses of nsIntPoint should eventually be converted to CSSIntPoint,
michael@0: // LayoutDeviceIntPoint, etc. (see layout/base/Units.h).
michael@0: 
michael@0: struct nsIntPoint : public mozilla::gfx::BasePoint<int32_t, nsIntPoint> {
michael@0:   typedef mozilla::gfx::BasePoint<int32_t, nsIntPoint> Super;
michael@0: 
michael@0:   nsIntPoint() : Super() {}
michael@0:   nsIntPoint(const nsIntPoint& aPoint) : Super(aPoint) {}
michael@0:   nsIntPoint(int32_t aX, int32_t aY) : Super(aX, aY) {}
michael@0: 
michael@0:   inline nsPoint ToAppUnits(nscoord aAppUnitsPerPixel) const;
michael@0: };
michael@0: 
michael@0: inline nsIntPoint
michael@0: nsPoint::ScaleToNearestPixels(float aXScale, float aYScale,
michael@0:                               nscoord aAppUnitsPerPixel) const
michael@0: {
michael@0:   return nsIntPoint(
michael@0:       NSToIntRoundUp(NSAppUnitsToDoublePixels(x, aAppUnitsPerPixel) * aXScale),
michael@0:       NSToIntRoundUp(NSAppUnitsToDoublePixels(y, aAppUnitsPerPixel) * aYScale));
michael@0: }
michael@0: 
michael@0: inline nsIntPoint
michael@0: nsPoint::ToNearestPixels(nscoord aAppUnitsPerPixel) const
michael@0: {
michael@0:   return ScaleToNearestPixels(1.0f, 1.0f, aAppUnitsPerPixel);
michael@0: }
michael@0: 
michael@0: inline nsPoint
michael@0: nsPoint::ConvertAppUnits(int32_t aFromAPP, int32_t aToAPP) const
michael@0: {
michael@0:   if (aFromAPP != aToAPP) {
michael@0:     nsPoint point;
michael@0:     point.x = NSToCoordRound(NSCoordScale(x, aFromAPP, aToAPP));
michael@0:     point.y = NSToCoordRound(NSCoordScale(y, aFromAPP, aToAPP));
michael@0:     return point;
michael@0:   }
michael@0:   return *this;
michael@0: }
michael@0: 
michael@0: // app units are integer multiples of pixels, so no rounding needed
michael@0: inline nsPoint
michael@0: nsIntPoint::ToAppUnits(nscoord aAppUnitsPerPixel) const
michael@0: {
michael@0:   return nsPoint(NSIntPixelsToAppUnits(x, aAppUnitsPerPixel),
michael@0:                  NSIntPixelsToAppUnits(y, aAppUnitsPerPixel));
michael@0: }
michael@0: 
michael@0: #endif /* NSPOINT_H */