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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_RECT_H_
+#define MOZILLA_GFX_RECT_H_
+
+#include "BaseRect.h"
+#include "BaseMargin.h"
+#include "NumericTools.h"
+#include "Point.h"
+#include "Tools.h"
+#include "mozilla/Maybe.h"
+
+#include <cmath>
+#include <cstdint>
+
+namespace mozilla {
+
+template <typename>
+struct IsPixel;
+
+namespace gfx {
+
+template <class Units, class F>
+struct RectTyped;
+
+template <class Units>
+struct MOZ_EMPTY_BASES IntMarginTyped
+ : public BaseMargin<int32_t, IntMarginTyped<Units>, IntCoordTyped<Units> >,
+ public Units {
+ static_assert(IsPixel<Units>::value,
+ "'Units' must be a coordinate system tag");
+
+ typedef IntCoordTyped<Units> Coord;
+ typedef BaseMargin<int32_t, IntMarginTyped<Units>, Coord> Super;
+
+ IntMarginTyped() : Super() {
+ static_assert(sizeof(IntMarginTyped) == sizeof(int32_t) * 4,
+ "Would be unfortunate otherwise!");
+ }
+ IntMarginTyped(Coord aTop, Coord aRight, Coord aBottom, Coord aLeft)
+ : Super(aTop, aRight, aBottom, aLeft) {}
+
+ // XXX When all of the code is ported, the following functions to convert
+ // to and from unknown types should be removed.
+
+ static IntMarginTyped<Units> FromUnknownMargin(
+ const IntMarginTyped<UnknownUnits>& aMargin) {
+ return IntMarginTyped<Units>(aMargin.top.value, aMargin.right.value,
+ aMargin.bottom.value, aMargin.left.value);
+ }
+
+ IntMarginTyped<UnknownUnits> ToUnknownMargin() const {
+ return IntMarginTyped<UnknownUnits>(this->top, this->right, this->bottom,
+ this->left);
+ }
+};
+typedef IntMarginTyped<UnknownUnits> IntMargin;
+
+template <class Units, class F = Float>
+struct MarginTyped
+ : public BaseMargin<F, MarginTyped<Units, F>, CoordTyped<Units, F> >,
+ public Units {
+ static_assert(IsPixel<Units>::value,
+ "'Units' must be a coordinate system tag");
+
+ typedef CoordTyped<Units, F> Coord;
+ typedef BaseMargin<F, MarginTyped<Units, F>, Coord> Super;
+
+ MarginTyped() : Super() {}
+ MarginTyped(Coord aTop, Coord aRight, Coord aBottom, Coord aLeft)
+ : Super(aTop, aRight, aBottom, aLeft) {}
+ explicit MarginTyped(const IntMarginTyped<Units>& aMargin)
+ : Super(F(aMargin.top), F(aMargin.right), F(aMargin.bottom),
+ F(aMargin.left)) {}
+
+ bool WithinEpsilonOf(const MarginTyped& aOther, F aEpsilon) const {
+ return fabs(this->left - aOther.left) < aEpsilon &&
+ fabs(this->top - aOther.top) < aEpsilon &&
+ fabs(this->right - aOther.right) < aEpsilon &&
+ fabs(this->bottom - aOther.bottom) < aEpsilon;
+ }
+
+ IntMarginTyped<Units> Rounded() const {
+ return IntMarginTyped<Units>(int32_t(std::floor(this->top + 0.5f)),
+ int32_t(std::floor(this->right + 0.5f)),
+ int32_t(std::floor(this->bottom + 0.5f)),
+ int32_t(std::floor(this->left + 0.5f)));
+ }
+};
+typedef MarginTyped<UnknownUnits> Margin;
+typedef MarginTyped<UnknownUnits, double> MarginDouble;
+
+template <class Units>
+IntMarginTyped<Units> RoundedToInt(const MarginTyped<Units>& aMargin) {
+ return aMargin.Rounded();
+}
+
+template <class Units>
+struct MOZ_EMPTY_BASES IntRectTyped
+ : public BaseRect<int32_t, IntRectTyped<Units>, IntPointTyped<Units>,
+ IntSizeTyped<Units>, IntMarginTyped<Units> >,
+ public Units {
+ static_assert(IsPixel<Units>::value,
+ "'Units' must be a coordinate system tag");
+
+ typedef BaseRect<int32_t, IntRectTyped<Units>, IntPointTyped<Units>,
+ IntSizeTyped<Units>, IntMarginTyped<Units> >
+ Super;
+ typedef IntRectTyped<Units> Self;
+ typedef IntParam<int32_t> ToInt;
+
+ IntRectTyped() : Super() {
+ static_assert(sizeof(IntRectTyped) == sizeof(int32_t) * 4,
+ "Would be unfortunate otherwise!");
+ }
+ IntRectTyped(const IntPointTyped<Units>& aPos,
+ const IntSizeTyped<Units>& aSize)
+ : Super(aPos, aSize) {}
+
+ IntRectTyped(ToInt aX, ToInt aY, ToInt aWidth, ToInt aHeight)
+ : Super(aX.value, aY.value, aWidth.value, aHeight.value) {}
+
+ static IntRectTyped<Units> RoundIn(float aX, float aY, float aW, float aH) {
+ return IntRectTyped<Units>::RoundIn(
+ RectTyped<Units, float>(aX, aY, aW, aH));
+ }
+
+ static IntRectTyped<Units> RoundOut(float aX, float aY, float aW, float aH) {
+ return IntRectTyped<Units>::RoundOut(
+ RectTyped<Units, float>(aX, aY, aW, aH));
+ }
+
+ static IntRectTyped<Units> Round(float aX, float aY, float aW, float aH) {
+ return IntRectTyped<Units>::Round(RectTyped<Units, float>(aX, aY, aW, aH));
+ }
+
+ static IntRectTyped<Units> Truncate(float aX, float aY, float aW, float aH) {
+ return IntRectTyped<Units>(IntPointTyped<Units>::Truncate(aX, aY),
+ IntSizeTyped<Units>::Truncate(aW, aH));
+ }
+
+ static IntRectTyped<Units> RoundIn(const RectTyped<Units, float>& aRect) {
+ auto tmp(aRect);
+ tmp.RoundIn();
+ return IntRectTyped(int32_t(tmp.X()), int32_t(tmp.Y()),
+ int32_t(tmp.Width()), int32_t(tmp.Height()));
+ }
+
+ static IntRectTyped<Units> RoundOut(const RectTyped<Units, float>& aRect) {
+ auto tmp(aRect);
+ tmp.RoundOut();
+ return IntRectTyped(int32_t(tmp.X()), int32_t(tmp.Y()),
+ int32_t(tmp.Width()), int32_t(tmp.Height()));
+ }
+
+ static IntRectTyped<Units> Round(const RectTyped<Units, float>& aRect) {
+ auto tmp(aRect);
+ tmp.Round();
+ return IntRectTyped(int32_t(tmp.X()), int32_t(tmp.Y()),
+ int32_t(tmp.Width()), int32_t(tmp.Height()));
+ }
+
+ static IntRectTyped<Units> Truncate(const RectTyped<Units, float>& aRect) {
+ return IntRectTyped::Truncate(aRect.X(), aRect.Y(), aRect.Width(),
+ aRect.Height());
+ }
+
+ // Rounding isn't meaningful on an integer rectangle.
+ void Round() {}
+ void RoundIn() {}
+ void RoundOut() {}
+
+ // XXX When all of the code is ported, the following functions to convert
+ // to and from unknown types should be removed.
+
+ static IntRectTyped<Units> FromUnknownRect(
+ const IntRectTyped<UnknownUnits>& rect) {
+ return IntRectTyped<Units>(rect.X(), rect.Y(), rect.Width(), rect.Height());
+ }
+
+ IntRectTyped<UnknownUnits> ToUnknownRect() const {
+ return IntRectTyped<UnknownUnits>(this->X(), this->Y(), this->Width(),
+ this->Height());
+ }
+
+ bool Overflows() const {
+ CheckedInt<int32_t> xMost = this->X();
+ xMost += this->Width();
+ CheckedInt<int32_t> yMost = this->Y();
+ yMost += this->Height();
+ return !xMost.isValid() || !yMost.isValid();
+ }
+
+ // Same as Union(), but in the cases where aRect is non-empty, the union is
+ // done while guarding against overflow. If an overflow is detected, Nothing
+ // is returned.
+ [[nodiscard]] Maybe<Self> SafeUnion(const Self& aRect) const {
+ if (this->IsEmpty()) {
+ return aRect.Overflows() ? Nothing() : Some(aRect);
+ } else if (aRect.IsEmpty()) {
+ return Some(*static_cast<const Self*>(this));
+ } else {
+ return this->SafeUnionEdges(aRect);
+ }
+ }
+
+ // Same as UnionEdges, but guards against overflow. If an overflow is
+ // detected, Nothing is returned.
+ [[nodiscard]] Maybe<Self> SafeUnionEdges(const Self& aRect) const {
+ if (this->Overflows() || aRect.Overflows()) {
+ return Nothing();
+ }
+ // If neither |this| nor |aRect| overflow, then their XMost/YMost values
+ // should be safe to use.
+ CheckedInt<int32_t> newX = std::min(this->x, aRect.x);
+ CheckedInt<int32_t> newY = std::min(this->y, aRect.y);
+ CheckedInt<int32_t> newXMost = std::max(this->XMost(), aRect.XMost());
+ CheckedInt<int32_t> newYMost = std::max(this->YMost(), aRect.YMost());
+ CheckedInt<int32_t> newW = newXMost - newX;
+ CheckedInt<int32_t> newH = newYMost - newY;
+ if (!newW.isValid() || !newH.isValid()) {
+ return Nothing();
+ }
+ return Some(Self(newX.value(), newY.value(), newW.value(), newH.value()));
+ }
+
+ // This is here only to keep IPDL-generated code happy. DO NOT USE.
+ bool operator==(const IntRectTyped<Units>& aRect) const {
+ return IntRectTyped<Units>::IsEqualEdges(aRect);
+ }
+
+ void InflateToMultiple(const IntSizeTyped<Units>& aTileSize) {
+ if (this->IsEmpty()) {
+ return;
+ }
+
+ int32_t yMost = this->YMost();
+ int32_t xMost = this->XMost();
+
+ this->x = mozilla::RoundDownToMultiple(this->x, aTileSize.width);
+ this->y = mozilla::RoundDownToMultiple(this->y, aTileSize.height);
+ xMost = mozilla::RoundUpToMultiple(xMost, aTileSize.width);
+ yMost = mozilla::RoundUpToMultiple(yMost, aTileSize.height);
+
+ this->SetWidth(xMost - this->x);
+ this->SetHeight(yMost - this->y);
+ }
+};
+typedef IntRectTyped<UnknownUnits> IntRect;
+
+template <class Units, class F = Float>
+struct MOZ_EMPTY_BASES RectTyped
+ : public BaseRect<F, RectTyped<Units, F>, PointTyped<Units, F>,
+ SizeTyped<Units, F>, MarginTyped<Units, F> >,
+ public Units {
+ static_assert(IsPixel<Units>::value,
+ "'Units' must be a coordinate system tag");
+
+ typedef BaseRect<F, RectTyped<Units, F>, PointTyped<Units, F>,
+ SizeTyped<Units, F>, MarginTyped<Units, F> >
+ Super;
+
+ RectTyped() : Super() {
+ static_assert(sizeof(RectTyped) == sizeof(F) * 4,
+ "Would be unfortunate otherwise!");
+ }
+ RectTyped(const PointTyped<Units, F>& aPos, const SizeTyped<Units, F>& aSize)
+ : Super(aPos, aSize) {}
+ RectTyped(F _x, F _y, F _width, F _height) : Super(_x, _y, _width, _height) {}
+ explicit RectTyped(const IntRectTyped<Units>& rect)
+ : Super(F(rect.X()), F(rect.Y()), F(rect.Width()), F(rect.Height())) {}
+
+ void NudgeToIntegers() {
+ NudgeToInteger(&(this->x));
+ NudgeToInteger(&(this->y));
+ NudgeToInteger(&(this->width));
+ NudgeToInteger(&(this->height));
+ }
+
+ bool ToIntRect(IntRectTyped<Units>* aOut) const {
+ *aOut =
+ IntRectTyped<Units>(int32_t(this->X()), int32_t(this->Y()),
+ int32_t(this->Width()), int32_t(this->Height()));
+ return RectTyped<Units, F>(F(aOut->X()), F(aOut->Y()), F(aOut->Width()),
+ F(aOut->Height()))
+ .IsEqualEdges(*this);
+ }
+
+ // XXX When all of the code is ported, the following functions to convert to
+ // and from unknown types should be removed.
+
+ static RectTyped<Units, F> FromUnknownRect(
+ const RectTyped<UnknownUnits, F>& rect) {
+ return RectTyped<Units, F>(rect.X(), rect.Y(), rect.Width(), rect.Height());
+ }
+
+ RectTyped<UnknownUnits, F> ToUnknownRect() const {
+ return RectTyped<UnknownUnits, F>(this->X(), this->Y(), this->Width(),
+ this->Height());
+ }
+
+ // This is here only to keep IPDL-generated code happy. DO NOT USE.
+ bool operator==(const RectTyped<Units, F>& aRect) const {
+ return RectTyped<Units, F>::IsEqualEdges(aRect);
+ }
+
+ bool WithinEpsilonOf(const RectTyped& aOther, F aEpsilon) const {
+ return fabs(this->x - aOther.x) < aEpsilon &&
+ fabs(this->y - aOther.y) < aEpsilon &&
+ fabs(this->width - aOther.width) < aEpsilon &&
+ fabs(this->height - aOther.height) < aEpsilon;
+ }
+};
+typedef RectTyped<UnknownUnits> Rect;
+typedef RectTyped<UnknownUnits, double> RectDouble;
+
+template <class Units>
+IntRectTyped<Units> RoundedToInt(const RectTyped<Units>& aRect) {
+ RectTyped<Units> copy(aRect);
+ copy.Round();
+ return IntRectTyped<Units>(int32_t(copy.X()), int32_t(copy.Y()),
+ int32_t(copy.Width()), int32_t(copy.Height()));
+}
+
+template <class Units>
+bool RectIsInt32Safe(const RectTyped<Units>& aRect) {
+ float min = (float)std::numeric_limits<std::int32_t>::min();
+ float max = (float)std::numeric_limits<std::int32_t>::max();
+ return aRect.x > min && aRect.y > min && aRect.width < max &&
+ aRect.height < max && aRect.XMost() < max && aRect.YMost() < max;
+}
+
+template <class Units>
+IntRectTyped<Units> RoundedIn(const RectTyped<Units>& aRect) {
+ return IntRectTyped<Units>::RoundIn(aRect);
+}
+
+template <class Units>
+IntRectTyped<Units> RoundedOut(const RectTyped<Units>& aRect) {
+ return IntRectTyped<Units>::RoundOut(aRect);
+}
+
+template <class Units>
+IntRectTyped<Units> TruncatedToInt(const RectTyped<Units>& aRect) {
+ return IntRectTyped<Units>::Truncate(aRect);
+}
+
+template <class Units>
+RectTyped<Units> IntRectToRect(const IntRectTyped<Units>& aRect) {
+ return RectTyped<Units>(aRect.X(), aRect.Y(), aRect.Width(), aRect.Height());
+}
+
+// Convenience functions for intersecting and unioning two rectangles wrapped in
+// Maybes.
+template <typename Rect>
+Maybe<Rect> IntersectMaybeRects(const Maybe<Rect>& a, const Maybe<Rect>& b) {
+ if (!a) {
+ return b;
+ } else if (!b) {
+ return a;
+ } else {
+ return Some(a->Intersect(*b));
+ }
+}
+template <typename Rect>
+Maybe<Rect> UnionMaybeRects(const Maybe<Rect>& a, const Maybe<Rect>& b) {
+ if (!a) {
+ return b;
+ } else if (!b) {
+ return a;
+ } else {
+ return Some(a->Union(*b));
+ }
+}
+
+struct RectCornerRadii final {
+ Size radii[eCornerCount];
+
+ RectCornerRadii() = default;
+
+ explicit RectCornerRadii(Float radius) {
+ for (const auto i : mozilla::AllPhysicalCorners()) {
+ radii[i].SizeTo(radius, radius);
+ }
+ }
+
+ RectCornerRadii(Float radiusX, Float radiusY) {
+ for (const auto i : mozilla::AllPhysicalCorners()) {
+ radii[i].SizeTo(radiusX, radiusY);
+ }
+ }
+
+ RectCornerRadii(Float tl, Float tr, Float br, Float bl) {
+ radii[eCornerTopLeft].SizeTo(tl, tl);
+ radii[eCornerTopRight].SizeTo(tr, tr);
+ radii[eCornerBottomRight].SizeTo(br, br);
+ radii[eCornerBottomLeft].SizeTo(bl, bl);
+ }
+
+ RectCornerRadii(const Size& tl, const Size& tr, const Size& br,
+ const Size& bl) {
+ radii[eCornerTopLeft] = tl;
+ radii[eCornerTopRight] = tr;
+ radii[eCornerBottomRight] = br;
+ radii[eCornerBottomLeft] = bl;
+ }
+
+ const Size& operator[](size_t aCorner) const { return radii[aCorner]; }
+
+ Size& operator[](size_t aCorner) { return radii[aCorner]; }
+
+ bool operator==(const RectCornerRadii& aOther) const {
+ return TopLeft() == aOther.TopLeft() && TopRight() == aOther.TopRight() &&
+ BottomRight() == aOther.BottomRight() &&
+ BottomLeft() == aOther.BottomLeft();
+ }
+
+ bool AreRadiiSame() const {
+ return TopLeft() == TopRight() && TopLeft() == BottomRight() &&
+ TopLeft() == BottomLeft();
+ }
+
+ void Scale(Float aXScale, Float aYScale) {
+ for (const auto i : mozilla::AllPhysicalCorners()) {
+ radii[i].Scale(aXScale, aYScale);
+ }
+ }
+
+ const Size TopLeft() const { return radii[eCornerTopLeft]; }
+ Size& TopLeft() { return radii[eCornerTopLeft]; }
+
+ const Size TopRight() const { return radii[eCornerTopRight]; }
+ Size& TopRight() { return radii[eCornerTopRight]; }
+
+ const Size BottomRight() const { return radii[eCornerBottomRight]; }
+ Size& BottomRight() { return radii[eCornerBottomRight]; }
+
+ const Size BottomLeft() const { return radii[eCornerBottomLeft]; }
+ Size& BottomLeft() { return radii[eCornerBottomLeft]; }
+
+ bool IsEmpty() const {
+ return TopLeft().IsEmpty() && TopRight().IsEmpty() &&
+ BottomRight().IsEmpty() && BottomLeft().IsEmpty();
+ }
+};
+
+/* A rounded rectangle abstraction.
+ *
+ * This can represent a rectangle with a different pair of radii on each corner.
+ *
+ * Note: CoreGraphics and Direct2D only support rounded rectangle with the same
+ * radii on all corners. However, supporting CSS's border-radius requires the
+ * extra flexibility. */
+struct RoundedRect {
+ typedef mozilla::gfx::RectCornerRadii RectCornerRadii;
+
+ RoundedRect(const Rect& aRect, const RectCornerRadii& aCorners)
+ : rect(aRect), corners(aCorners) {}
+
+ void Deflate(Float aTopWidth, Float aBottomWidth, Float aLeftWidth,
+ Float aRightWidth) {
+ // deflate the internal rect
+ rect.SetRect(rect.X() + aLeftWidth, rect.Y() + aTopWidth,
+ std::max(0.f, rect.Width() - aLeftWidth - aRightWidth),
+ std::max(0.f, rect.Height() - aTopWidth - aBottomWidth));
+
+ corners.radii[mozilla::eCornerTopLeft].width = std::max(
+ 0.f, corners.radii[mozilla::eCornerTopLeft].width - aLeftWidth);
+ corners.radii[mozilla::eCornerTopLeft].height = std::max(
+ 0.f, corners.radii[mozilla::eCornerTopLeft].height - aTopWidth);
+
+ corners.radii[mozilla::eCornerTopRight].width = std::max(
+ 0.f, corners.radii[mozilla::eCornerTopRight].width - aRightWidth);
+ corners.radii[mozilla::eCornerTopRight].height = std::max(
+ 0.f, corners.radii[mozilla::eCornerTopRight].height - aTopWidth);
+
+ corners.radii[mozilla::eCornerBottomLeft].width = std::max(
+ 0.f, corners.radii[mozilla::eCornerBottomLeft].width - aLeftWidth);
+ corners.radii[mozilla::eCornerBottomLeft].height = std::max(
+ 0.f, corners.radii[mozilla::eCornerBottomLeft].height - aBottomWidth);
+
+ corners.radii[mozilla::eCornerBottomRight].width = std::max(
+ 0.f, corners.radii[mozilla::eCornerBottomRight].width - aRightWidth);
+ corners.radii[mozilla::eCornerBottomRight].height = std::max(
+ 0.f, corners.radii[mozilla::eCornerBottomRight].height - aBottomWidth);
+ }
+ Rect rect;
+ RectCornerRadii corners;
+};
+
+} // namespace gfx
+} // namespace mozilla
+
+#endif /* MOZILLA_GFX_RECT_H_ */