Bug 1890689 accumulate input in LargerReceiverBlockSizeThanDesiredBuffering GTest...
[gecko.git] / gfx / 2d / BaseMargin.h
blob469541e6177bd9d35415010e21a45c6b50dee1c0
1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
3 /* This Source Code Form is subject to the terms of the Mozilla Public
4 * License, v. 2.0. If a copy of the MPL was not distributed with this
5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
7 #ifndef MOZILLA_GFX_BASEMARGIN_H_
8 #define MOZILLA_GFX_BASEMARGIN_H_
10 #include <ostream>
12 #include "Types.h"
14 namespace mozilla {
16 /**
17 * Sides represents a set of physical sides.
19 struct Sides final {
20 Sides() : mBits(SideBits::eNone) {}
21 explicit Sides(SideBits aSideBits) {
22 MOZ_ASSERT((aSideBits & ~SideBits::eAll) == SideBits::eNone,
23 "illegal side bits");
24 mBits = aSideBits;
26 bool IsEmpty() const { return mBits == SideBits::eNone; }
27 bool Top() const { return (mBits & SideBits::eTop) == SideBits::eTop; }
28 bool Right() const { return (mBits & SideBits::eRight) == SideBits::eRight; }
29 bool Bottom() const {
30 return (mBits & SideBits::eBottom) == SideBits::eBottom;
32 bool Left() const { return (mBits & SideBits::eLeft) == SideBits::eLeft; }
33 bool Contains(SideBits aSideBits) const {
34 MOZ_ASSERT(!(aSideBits & ~SideBits::eAll), "illegal side bits");
35 return (mBits & aSideBits) == aSideBits;
37 Sides operator|(Sides aOther) const {
38 return Sides(SideBits(mBits | aOther.mBits));
40 Sides operator|(SideBits aSideBits) const { return *this | Sides(aSideBits); }
41 Sides& operator|=(Sides aOther) {
42 mBits |= aOther.mBits;
43 return *this;
45 Sides& operator|=(SideBits aSideBits) { return *this |= Sides(aSideBits); }
46 bool operator==(Sides aOther) const { return mBits == aOther.mBits; }
47 bool operator!=(Sides aOther) const { return !(*this == aOther); }
49 private:
50 SideBits mBits;
53 namespace gfx {
55 /**
56 * Do not use this class directly. Subclass it, pass that subclass as the
57 * Sub parameter, and only use that subclass.
59 template <class T, class Sub, class Coord = T>
60 struct BaseMargin {
61 typedef mozilla::Side SideT; // because we have a method named Side
63 // Do not change the layout of these members; the Side() methods below
64 // depend on this order.
65 Coord top, right, bottom, left;
67 // Constructors
68 BaseMargin() : top(0), right(0), bottom(0), left(0) {}
69 BaseMargin(Coord aTop, Coord aRight, Coord aBottom, Coord aLeft)
70 : top(aTop), right(aRight), bottom(aBottom), left(aLeft) {}
72 void SizeTo(Coord aTop, Coord aRight, Coord aBottom, Coord aLeft) {
73 top = aTop;
74 right = aRight;
75 bottom = aBottom;
76 left = aLeft;
79 Coord LeftRight() const { return left + right; }
80 Coord TopBottom() const { return top + bottom; }
82 Coord& Side(SideT aSide) {
83 // This is ugly!
84 return *(&top + int(aSide));
86 Coord Side(SideT aSide) const {
87 // This is ugly!
88 return *(&top + int(aSide));
91 Sub& ApplySkipSides(Sides aSkipSides) {
92 if (aSkipSides.Top()) {
93 top = 0;
95 if (aSkipSides.Right()) {
96 right = 0;
98 if (aSkipSides.Bottom()) {
99 bottom = 0;
101 if (aSkipSides.Left()) {
102 left = 0;
104 return *static_cast<Sub*>(this);
107 // Ensures that all our sides are at least as big as the argument.
108 void EnsureAtLeast(const BaseMargin& aMargin) {
109 top = std::max(top, aMargin.top);
110 right = std::max(right, aMargin.right);
111 bottom = std::max(bottom, aMargin.bottom);
112 left = std::max(left, aMargin.left);
115 // Ensures that all our sides are at most as big as the argument.
116 void EnsureAtMost(const BaseMargin& aMargin) {
117 top = std::min(top, aMargin.top);
118 right = std::min(right, aMargin.right);
119 bottom = std::min(bottom, aMargin.bottom);
120 left = std::min(left, aMargin.left);
123 // Overloaded operators. Note that '=' isn't defined so we'll get the
124 // compiler generated default assignment operator
125 bool operator==(const Sub& aMargin) const {
126 return top == aMargin.top && right == aMargin.right &&
127 bottom == aMargin.bottom && left == aMargin.left;
129 bool operator!=(const Sub& aMargin) const { return !(*this == aMargin); }
130 Sub operator+(const Sub& aMargin) const {
131 return Sub(top + aMargin.top, right + aMargin.right,
132 bottom + aMargin.bottom, left + aMargin.left);
134 Sub operator-(const Sub& aMargin) const {
135 return Sub(top - aMargin.top, right - aMargin.right,
136 bottom - aMargin.bottom, left - aMargin.left);
138 Sub operator-() const { return Sub(-top, -right, -bottom, -left); }
139 Sub& operator+=(const Sub& aMargin) {
140 top += aMargin.top;
141 right += aMargin.right;
142 bottom += aMargin.bottom;
143 left += aMargin.left;
144 return *static_cast<Sub*>(this);
146 Sub& operator-=(const Sub& aMargin) {
147 top -= aMargin.top;
148 right -= aMargin.right;
149 bottom -= aMargin.bottom;
150 left -= aMargin.left;
151 return *static_cast<Sub*>(this);
154 friend std::ostream& operator<<(std::ostream& aStream,
155 const BaseMargin& aMargin) {
156 return aStream << "(t=" << aMargin.top << ", r=" << aMargin.right
157 << ", b=" << aMargin.bottom << ", l=" << aMargin.left << ')';
161 } // namespace gfx
162 } // namespace mozilla
164 #endif /* MOZILLA_GFX_BASEMARGIN_H_ */