dom/base/DOMQuad.cpp

   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/. */
   6
   7 #include "mozilla/dom/DOMQuad.h"
   8
   9 #include "mozilla/dom/DOMPoint.h"
  10 #include "mozilla/dom/DOMQuadBinding.h"
  11 #include "mozilla/dom/DOMRect.h"
  12 #include "mozilla/dom/DOMRectBinding.h"
  13 #include "mozilla/FloatingPoint.h"
  14
  15 using namespace mozilla;
  16 using namespace mozilla::dom;
  17 using namespace mozilla::gfx;
  18
  19 NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(DOMQuad, mParent, mPoints[0], mPoints[1],
  20                                       mPoints[2], mPoints[3])
  21
  22 NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(DOMQuad, AddRef)
  23 NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(DOMQuad, Release)
  24
  25 DOMQuad::DOMQuad(nsISupports* aParent, CSSPoint aPoints[4]) : mParent(aParent) {
  26   for (uint32_t i = 0; i < 4; ++i) {
  27     mPoints[i] = new DOMPoint(aParent, aPoints[i].x, aPoints[i].y);
  28   }
  29 }
  30
  31 DOMQuad::DOMQuad(nsISupports* aParent) : mParent(aParent) {}
  32
  33 DOMQuad::~DOMQuad() = default;
  34
  35 JSObject* DOMQuad::WrapObject(JSContext* aCx,
  36                               JS::Handle<JSObject*> aGivenProto) {
  37   return DOMQuad_Binding::Wrap(aCx, this, aGivenProto);
  38 }
  39
  40 already_AddRefed<DOMQuad> DOMQuad::FromRect(const GlobalObject& aGlobal,
  41                                             const DOMRectInit& aInit) {
  42   nsISupports* parent = aGlobal.GetAsSupports();
  43   RefPtr<DOMQuad> obj = new DOMQuad(parent);
  44   obj->mPoints[0] = new DOMPoint(parent, aInit.mX, aInit.mY, 0, 1);
  45   obj->mPoints[1] =
  46       new DOMPoint(parent, aInit.mX + aInit.mWidth, aInit.mY, 0, 1);
  47   obj->mPoints[2] = new DOMPoint(parent, aInit.mX + aInit.mWidth,
  48                                  aInit.mY + aInit.mHeight, 0, 1);
  49   obj->mPoints[3] =
  50       new DOMPoint(parent, aInit.mX, aInit.mY + aInit.mHeight, 0, 1);
  51   return obj.forget();
  52 }
  53
  54 already_AddRefed<DOMQuad> DOMQuad::FromQuad(const GlobalObject& aGlobal,
  55                                             const DOMQuadInit& aInit) {
  56   RefPtr<DOMQuad> obj = new DOMQuad(aGlobal.GetAsSupports());
  57   obj->mPoints[0] = DOMPoint::FromPoint(aGlobal, aInit.mP1);
  58   obj->mPoints[1] = DOMPoint::FromPoint(aGlobal, aInit.mP2);
  59   obj->mPoints[2] = DOMPoint::FromPoint(aGlobal, aInit.mP3);
  60   obj->mPoints[3] = DOMPoint::FromPoint(aGlobal, aInit.mP4);
  61   return obj.forget();
  62 }
  63
  64 already_AddRefed<DOMQuad> DOMQuad::Constructor(const GlobalObject& aGlobal,
  65                                                const DOMPointInit& aP1,
  66                                                const DOMPointInit& aP2,
  67                                                const DOMPointInit& aP3,
  68                                                const DOMPointInit& aP4) {
  69   RefPtr<DOMQuad> obj = new DOMQuad(aGlobal.GetAsSupports());
  70   obj->mPoints[0] = DOMPoint::FromPoint(aGlobal, aP1);
  71   obj->mPoints[1] = DOMPoint::FromPoint(aGlobal, aP2);
  72   obj->mPoints[2] = DOMPoint::FromPoint(aGlobal, aP3);
  73   obj->mPoints[3] = DOMPoint::FromPoint(aGlobal, aP4);
  74   return obj.forget();
  75 }
  76
  77 already_AddRefed<DOMQuad> DOMQuad::Constructor(const GlobalObject& aGlobal,
  78                                                const DOMRectReadOnly& aRect) {
  79   CSSPoint points[4];
  80   Float x = aRect.X(), y = aRect.Y(), w = aRect.Width(), h = aRect.Height();
  81   points[0] = CSSPoint(x, y);
  82   points[1] = CSSPoint(x + w, y);
  83   points[2] = CSSPoint(x + w, y + h);
  84   points[3] = CSSPoint(x, y + h);
  85   RefPtr<DOMQuad> obj = new DOMQuad(aGlobal.GetAsSupports(), points);
  86   return obj.forget();
  87 }
  88
  89 void DOMQuad::GetHorizontalMinMax(double* aX1, double* aX2) const {
  90   double x1, x2;
  91   x1 = x2 = Point(0)->X();
  92   for (uint32_t i = 1; i < 4; ++i) {
  93     double x = Point(i)->X();
  94     x1 = NaNSafeMin(x1, x);
  95     x2 = NaNSafeMax(x2, x);
  96   }
  97   *aX1 = x1;
  98   *aX2 = x2;
  99 }
 100
 101 void DOMQuad::GetVerticalMinMax(double* aY1, double* aY2) const {
 102   double y1, y2;
 103   y1 = y2 = Point(0)->Y();
 104   for (uint32_t i = 1; i < 4; ++i) {
 105     double y = Point(i)->Y();
 106     y1 = NaNSafeMin(y1, y);
 107     y2 = NaNSafeMax(y2, y);
 108   }
 109   *aY1 = y1;
 110   *aY2 = y2;
 111 }
 112
 113 already_AddRefed<DOMRectReadOnly> DOMQuad::GetBounds() const {
 114   double x1, x2;
 115   double y1, y2;
 116
 117   GetHorizontalMinMax(&x1, &x2);
 118   GetVerticalMinMax(&y1, &y2);
 119
 120   RefPtr<DOMRectReadOnly> rval =
 121       new DOMRectReadOnly(GetParentObject(), x1, y1, x2 - x1, y2 - y1);
 122   return rval.forget();
 123 }
 124
 125 // https://drafts.fxtf.org/geometry/#structured-serialization
 126 bool DOMQuad::WriteStructuredClone(JSContext* aCx,
 127                                    JSStructuredCloneWriter* aWriter) const {
 128   for (const auto& point : mPoints) {
 129     if (!point->WriteStructuredClone(aCx, aWriter)) {
 130       return false;
 131     }
 132   }
 133   return true;
 134 }
 135
 136 // static
 137 already_AddRefed<DOMQuad> DOMQuad::ReadStructuredClone(
 138     JSContext* aCx, nsIGlobalObject* aGlobal,
 139     JSStructuredCloneReader* aReader) {
 140   RefPtr<DOMQuad> quad = new DOMQuad(aGlobal);
 141   for (auto& point : quad->mPoints) {
 142     point = DOMPoint::ReadStructuredClone(aCx, aGlobal, aReader);
 143     if (!point) {
 144       return nullptr;
 145     }
 146   }
 147   return quad.forget();
 148 }