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-rw-r--r--gfx/src/nsPoint.h106
1 files changed, 106 insertions, 0 deletions
diff --git a/gfx/src/nsPoint.h b/gfx/src/nsPoint.h
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+++ b/gfx/src/nsPoint.h
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+/* -*- 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"
+#include "mozilla/gfx/Point.h"
+
+// nsIntPoint represents a point in one of the types of pixels.
+// Uses of nsIntPoint should eventually be converted to CSSIntPoint,
+// LayoutDeviceIntPoint, etc. (see layout/base/Units.h).
+typedef mozilla::gfx::IntPoint nsIntPoint;
+
+// nsPoint represents a point in app units.
+
+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;
+
+ /**
+ * Return this point scaled to a different appunits per pixel (APP) ratio.
+ * @param aFromAPP the APP to scale from
+ * @param aToAPP the APP to scale to
+ */
+ MOZ_MUST_USE inline nsPoint
+ ScaleToOtherAppUnits(int32_t aFromAPP, int32_t aToAPP) const;
+
+ MOZ_MUST_USE inline nsPoint
+ RemoveResolution(const float resolution) const;
+ MOZ_MUST_USE inline nsPoint
+ ApplyResolution(const float resolution) const;
+};
+
+inline nsPoint ToAppUnits(const nsIntPoint& aPoint, nscoord aAppUnitsPerPixel);
+
+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::ScaleToOtherAppUnits(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;
+}
+
+inline nsPoint
+nsPoint::RemoveResolution(const float resolution) const {
+ if (resolution != 1.0f) {
+ nsPoint point;
+ point.x = NSToCoordRound(NSCoordToFloat(x) / resolution);
+ point.y = NSToCoordRound(NSCoordToFloat(y) / resolution);
+ return point;
+ }
+ return *this;
+}
+
+inline nsPoint
+nsPoint::ApplyResolution(const float resolution) const {
+ if (resolution != 1.0f) {
+ nsPoint point;
+ point.x = NSToCoordRound(NSCoordToFloat(x) * resolution);
+ point.y = NSToCoordRound(NSCoordToFloat(y) * resolution);
+ return point;
+ }
+ return *this;
+}
+
+// app units are integer multiples of pixels, so no rounding needed
+inline nsPoint
+ToAppUnits(const nsIntPoint& aPoint, nscoord aAppUnitsPerPixel)
+{
+ return nsPoint(NSIntPixelsToAppUnits(aPoint.x, aAppUnitsPerPixel),
+ NSIntPixelsToAppUnits(aPoint.y, aAppUnitsPerPixel));
+}
+
+#endif /* NSPOINT_H */