tor-browser

The Tor Browser
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DOMQuad.cpp (5195B)

      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/FloatingPoint.h"
     10 #include "mozilla/dom/BindingDeclarations.h"
     11 #include "mozilla/dom/DOMPoint.h"
     12 #include "mozilla/dom/DOMQuadBinding.h"
     13 #include "mozilla/dom/DOMRect.h"
     14 #include "mozilla/dom/DOMRectBinding.h"
     15 #include "mozilla/gfx/BasePoint.h"
     16 #include "mozilla/gfx/MatrixFwd.h"
     17 #include "nsIGlobalObject.h"
     18 
     19 using namespace mozilla;
     20 using namespace mozilla::dom;
     21 using namespace mozilla::gfx;
     22 
     23 NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(DOMQuad, mParent, mPoints[0], mPoints[1],
     24                                      mPoints[2], mPoints[3])
     25 
     26 DOMQuad::DOMQuad(nsISupports* aParent, CSSPoint aPoints[4]) : mParent(aParent) {
     27  for (uint32_t i = 0; i < 4; ++i) {
     28    mPoints[i] = new DOMPoint(aParent, aPoints[i].x, aPoints[i].y);
     29  }
     30 }
     31 
     32 DOMQuad::DOMQuad(nsISupports* aParent) : mParent(aParent) {}
     33 
     34 DOMQuad::~DOMQuad() = default;
     35 
     36 JSObject* DOMQuad::WrapObject(JSContext* aCx,
     37                              JS::Handle<JSObject*> aGivenProto) {
     38  return DOMQuad_Binding::Wrap(aCx, this, aGivenProto);
     39 }
     40 
     41 already_AddRefed<DOMQuad> DOMQuad::FromRect(const GlobalObject& aGlobal,
     42                                            const DOMRectInit& aInit) {
     43  nsISupports* parent = aGlobal.GetAsSupports();
     44  RefPtr<DOMQuad> obj = new DOMQuad(parent);
     45  obj->mPoints[0] = new DOMPoint(parent, aInit.mX, aInit.mY, 0, 1);
     46  obj->mPoints[1] =
     47      new DOMPoint(parent, aInit.mX + aInit.mWidth, aInit.mY, 0, 1);
     48  obj->mPoints[2] = new DOMPoint(parent, aInit.mX + aInit.mWidth,
     49                                 aInit.mY + aInit.mHeight, 0, 1);
     50  obj->mPoints[3] =
     51      new DOMPoint(parent, aInit.mX, aInit.mY + aInit.mHeight, 0, 1);
     52  return obj.forget();
     53 }
     54 
     55 already_AddRefed<DOMQuad> DOMQuad::FromQuad(const GlobalObject& aGlobal,
     56                                            const DOMQuadInit& aInit) {
     57  RefPtr<DOMQuad> obj = new DOMQuad(aGlobal.GetAsSupports());
     58  obj->mPoints[0] = DOMPoint::FromPoint(aGlobal, aInit.mP1);
     59  obj->mPoints[1] = DOMPoint::FromPoint(aGlobal, aInit.mP2);
     60  obj->mPoints[2] = DOMPoint::FromPoint(aGlobal, aInit.mP3);
     61  obj->mPoints[3] = DOMPoint::FromPoint(aGlobal, aInit.mP4);
     62  return obj.forget();
     63 }
     64 
     65 already_AddRefed<DOMQuad> DOMQuad::Constructor(const GlobalObject& aGlobal,
     66                                               const DOMPointInit& aP1,
     67                                               const DOMPointInit& aP2,
     68                                               const DOMPointInit& aP3,
     69                                               const DOMPointInit& aP4) {
     70  RefPtr<DOMQuad> obj = new DOMQuad(aGlobal.GetAsSupports());
     71  obj->mPoints[0] = DOMPoint::FromPoint(aGlobal, aP1);
     72  obj->mPoints[1] = DOMPoint::FromPoint(aGlobal, aP2);
     73  obj->mPoints[2] = DOMPoint::FromPoint(aGlobal, aP3);
     74  obj->mPoints[3] = DOMPoint::FromPoint(aGlobal, aP4);
     75  return obj.forget();
     76 }
     77 
     78 already_AddRefed<DOMQuad> DOMQuad::Constructor(const GlobalObject& aGlobal,
     79                                               const DOMRectReadOnly& aRect) {
     80  CSSPoint points[4];
     81  Float x = aRect.X(), y = aRect.Y(), w = aRect.Width(), h = aRect.Height();
     82  points[0] = CSSPoint(x, y);
     83  points[1] = CSSPoint(x + w, y);
     84  points[2] = CSSPoint(x + w, y + h);
     85  points[3] = CSSPoint(x, y + h);
     86  RefPtr<DOMQuad> obj = new DOMQuad(aGlobal.GetAsSupports(), points);
     87  return obj.forget();
     88 }
     89 
     90 void DOMQuad::GetHorizontalMinMax(double* aX1, double* aX2) const {
     91  double x1, x2;
     92  x1 = x2 = Point(0)->X();
     93  for (uint32_t i = 1; i < 4; ++i) {
     94    double x = Point(i)->X();
     95    x1 = NaNSafeMin(x1, x);
     96    x2 = NaNSafeMax(x2, x);
     97  }
     98  *aX1 = x1;
     99  *aX2 = x2;
    100 }
    101 
    102 void DOMQuad::GetVerticalMinMax(double* aY1, double* aY2) const {
    103  double y1, y2;
    104  y1 = y2 = Point(0)->Y();
    105  for (uint32_t i = 1; i < 4; ++i) {
    106    double y = Point(i)->Y();
    107    y1 = NaNSafeMin(y1, y);
    108    y2 = NaNSafeMax(y2, y);
    109  }
    110  *aY1 = y1;
    111  *aY2 = y2;
    112 }
    113 
    114 already_AddRefed<DOMRectReadOnly> DOMQuad::GetBounds() const {
    115  double x1, x2;
    116  double y1, y2;
    117 
    118  GetHorizontalMinMax(&x1, &x2);
    119  GetVerticalMinMax(&y1, &y2);
    120 
    121  RefPtr<DOMRectReadOnly> rval =
    122      new DOMRectReadOnly(GetParentObject(), x1, y1, x2 - x1, y2 - y1);
    123  return rval.forget();
    124 }
    125 
    126 // https://drafts.fxtf.org/geometry/#structured-serialization
    127 bool DOMQuad::WriteStructuredClone(JSContext* aCx,
    128                                   JSStructuredCloneWriter* aWriter) const {
    129  for (const auto& point : mPoints) {
    130    if (!point->WriteStructuredClone(aCx, aWriter)) {
    131      return false;
    132    }
    133  }
    134  return true;
    135 }
    136 
    137 // static
    138 already_AddRefed<DOMQuad> DOMQuad::ReadStructuredClone(
    139    JSContext* aCx, nsIGlobalObject* aGlobal,
    140    JSStructuredCloneReader* aReader) {
    141  RefPtr<DOMQuad> quad = new DOMQuad(aGlobal);
    142  for (auto& point : quad->mPoints) {
    143    point = DOMPoint::ReadStructuredClone(aCx, aGlobal, aReader);
    144    if (!point) {
    145      return nullptr;
    146    }
    147  }
    148  return quad.forget();
    149 }