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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-21 11:44:51 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-21 11:44:51 +0000
commit9e3c08db40b8916968b9f30096c7be3f00ce9647 (patch)
treea68f146d7fa01f0134297619fbe7e33db084e0aa /gfx/2d/BasePoint.h
parentInitial commit. (diff)
downloadthunderbird-9e3c08db40b8916968b9f30096c7be3f00ce9647.tar.xz
thunderbird-9e3c08db40b8916968b9f30096c7be3f00ce9647.zip
Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'gfx/2d/BasePoint.h')
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1 files changed, 120 insertions, 0 deletions
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 MOZILLA_GFX_BASEPOINT_H_
+#define MOZILLA_GFX_BASEPOINT_H_
+
+#include <cmath>
+#include <ostream>
+#include <type_traits>
+#include "mozilla/Attributes.h"
+#include "mozilla/FloatingPoint.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, class Coord = T>
+struct BasePoint {
+ union {
+ struct {
+ Coord x, y;
+ };
+ Coord components[2];
+ };
+
+ // Constructors
+ constexpr BasePoint() : x(0), y(0) {}
+ constexpr BasePoint(Coord aX, Coord aY) : x(aX), y(aY) {}
+
+ MOZ_ALWAYS_INLINE Coord X() const { return x; }
+ MOZ_ALWAYS_INLINE Coord Y() const { return y; }
+
+ 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); }
+
+ T DotProduct(const Sub& aPoint) const {
+ return x.value * aPoint.x.value + y.value * aPoint.y.value;
+ }
+
+ Coord Length() const { return hypot(x.value, y.value); }
+
+ T LengthSquare() const { return x.value * x.value + y.value * y.value; }
+
+ // Round() is *not* rounding to nearest integer if the values are negative.
+ // They are always rounding as floor(n + 0.5).
+ // See https://bugzilla.mozilla.org/show_bug.cgi?id=410748#c14
+ Sub& Round() {
+ x = Coord(std::floor(T(x) + T(0.5f)));
+ y = Coord(std::floor(T(y) + T(0.5f)));
+ return *static_cast<Sub*>(this);
+ }
+
+ // "Finite" means not inf and not NaN
+ bool IsFinite() const {
+ using FloatType =
+ std::conditional_t<std::is_same_v<T, float>, float, double>;
+ return (std::isfinite(FloatType(x)) && std::isfinite(FloatType(y)));
+ return true;
+ }
+
+ void Clamp(T aMaxAbsValue) {
+ x = std::max(std::min(x, aMaxAbsValue), -aMaxAbsValue);
+ y = std::max(std::min(y, aMaxAbsValue), -aMaxAbsValue);
+ }
+
+ friend std::ostream& operator<<(std::ostream& stream,
+ const BasePoint<T, Sub, Coord>& aPoint) {
+ return stream << '(' << aPoint.x << ',' << aPoint.y << ')';
+ }
+};
+
+} // namespace gfx
+} // namespace mozilla
+
+#endif /* MOZILLA_GFX_BASEPOINT_H_ */