dom/svg/SVGRectElement.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #include "mozilla/dom/SVGRectElement.h"
   7 #include "nsGkAtoms.h"
   8 #include "mozilla/dom/SVGRectElementBinding.h"
   9 #include "mozilla/gfx/2D.h"
  10 #include "mozilla/gfx/Matrix.h"
  11 #include "mozilla/gfx/Rect.h"
  12 #include "mozilla/gfx/PathHelpers.h"
  13 #include <algorithm>
  14
  15 NS_IMPL_NS_NEW_NAMESPACED_SVG_ELEMENT(Rect)
  16
  17 using namespace mozilla::gfx;
  18
  19 namespace mozilla {
  20 namespace dom {
  21
  22 class SVGAnimatedLength;
  23
  24 JSObject*
  25 SVGRectElement::WrapNode(JSContext *aCx)
  26 {
  27   return SVGRectElementBinding::Wrap(aCx, this);
  28 }
  29
  30 nsSVGElement::LengthInfo SVGRectElement::sLengthInfo[6] =
  31 {
  32   { &nsGkAtoms::x, 0, nsIDOMSVGLength::SVG_LENGTHTYPE_NUMBER, SVGContentUtils::X },
  33   { &nsGkAtoms::y, 0, nsIDOMSVGLength::SVG_LENGTHTYPE_NUMBER, SVGContentUtils::Y },
  34   { &nsGkAtoms::width, 0, nsIDOMSVGLength::SVG_LENGTHTYPE_NUMBER, SVGContentUtils::X },
  35   { &nsGkAtoms::height, 0, nsIDOMSVGLength::SVG_LENGTHTYPE_NUMBER, SVGContentUtils::Y },
  36   { &nsGkAtoms::rx, 0, nsIDOMSVGLength::SVG_LENGTHTYPE_NUMBER, SVGContentUtils::X },
  37   { &nsGkAtoms::ry, 0, nsIDOMSVGLength::SVG_LENGTHTYPE_NUMBER, SVGContentUtils::Y }
  38 };
  39
  40 //----------------------------------------------------------------------
  41 // Implementation
  42
  43 SVGRectElement::SVGRectElement(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo)
  44   : SVGRectElementBase(aNodeInfo)
  45 {
  46 }
  47
  48 //----------------------------------------------------------------------
  49 // nsIDOMNode methods
  50
  51 NS_IMPL_ELEMENT_CLONE_WITH_INIT(SVGRectElement)
  52
  53 //----------------------------------------------------------------------
  54
  55 already_AddRefed<SVGAnimatedLength>
  56 SVGRectElement::X()
  57 {
  58   return mLengthAttributes[ATTR_X].ToDOMAnimatedLength(this);
  59 }
  60
  61 already_AddRefed<SVGAnimatedLength>
  62 SVGRectElement::Y()
  63 {
  64   return mLengthAttributes[ATTR_Y].ToDOMAnimatedLength(this);
  65 }
  66
  67 already_AddRefed<SVGAnimatedLength>
  68 SVGRectElement::Width()
  69 {
  70   return mLengthAttributes[ATTR_WIDTH].ToDOMAnimatedLength(this);
  71 }
  72
  73 already_AddRefed<SVGAnimatedLength>
  74 SVGRectElement::Height()
  75 {
  76   return mLengthAttributes[ATTR_HEIGHT].ToDOMAnimatedLength(this);
  77 }
  78
  79 already_AddRefed<SVGAnimatedLength>
  80 SVGRectElement::Rx()
  81 {
  82   return mLengthAttributes[ATTR_RX].ToDOMAnimatedLength(this);
  83 }
  84
  85 already_AddRefed<SVGAnimatedLength>
  86 SVGRectElement::Ry()
  87 {
  88   return mLengthAttributes[ATTR_RY].ToDOMAnimatedLength(this);
  89 }
  90
  91 //----------------------------------------------------------------------
  92 // nsSVGElement methods
  93
  94 /* virtual */ bool
  95 SVGRectElement::HasValidDimensions() const
  96 {
  97   return mLengthAttributes[ATTR_WIDTH].IsExplicitlySet() &&
  98          mLengthAttributes[ATTR_WIDTH].GetAnimValInSpecifiedUnits() > 0 &&
  99          mLengthAttributes[ATTR_HEIGHT].IsExplicitlySet() &&
 100          mLengthAttributes[ATTR_HEIGHT].GetAnimValInSpecifiedUnits() > 0;
 101 }
 102
 103 nsSVGElement::LengthAttributesInfo
 104 SVGRectElement::GetLengthInfo()
 105 {
 106   return LengthAttributesInfo(mLengthAttributes, sLengthInfo,
 107                               ArrayLength(sLengthInfo));
 108 }
 109
 110 //----------------------------------------------------------------------
 111 // nsSVGPathGeometryElement methods
 112
 113 bool
 114 SVGRectElement::GetGeometryBounds(Rect* aBounds, Float aStrokeWidth,
 115                                   const Matrix& aTransform)
 116 {
 117   Rect rect;
 118   Float rx, ry;
 119   GetAnimatedLengthValues(&rect.x, &rect.y, &rect.width,
 120                           &rect.height, &rx, &ry, nullptr);
 121
 122   if (rect.IsEmpty()) {
 123     // Rendering of the element disabled
 124     rect.SetEmpty(); // Make sure width/height are zero and not negative
 125     *aBounds = rect; // We still want the x/y position from 'rect'
 126     return true;
 127   }
 128
 129   if (!aTransform.IsRectilinear()) {
 130     // We can't ignore the radii in this case if we want tight bounds
 131     rx = std::max(rx, 0.0f);
 132     ry = std::max(ry, 0.0f);
 133
 134     if (rx != 0 || ry != 0) {
 135       return false;
 136     }
 137   }
 138
 139   if (aStrokeWidth > 0.f) {
 140     rect.Inflate(aStrokeWidth / 2.f);
 141   }
 142
 143   *aBounds = aTransform.TransformBounds(rect);
 144   return true;
 145 }
 146
 147 void
 148 SVGRectElement::GetAsSimplePath(SimplePath* aSimplePath)
 149 {
 150   float x, y, width, height, rx, ry;
 151   GetAnimatedLengthValues(&x, &y, &width, &height, &rx, &ry, nullptr);
 152
 153   if (width <= 0 || height <= 0) {
 154     aSimplePath->Reset();
 155     return;
 156   }
 157
 158   rx = std::max(rx, 0.0f);
 159   ry = std::max(ry, 0.0f);
 160
 161   if (rx != 0 || ry != 0) {
 162     aSimplePath->Reset();
 163     return;
 164   }
 165
 166   aSimplePath->SetRect(x, y, width, height);
 167 }
 168
 169 TemporaryRef<Path>
 170 SVGRectElement::BuildPath(PathBuilder* aBuilder)
 171 {
 172   float x, y, width, height, rx, ry;
 173   GetAnimatedLengthValues(&x, &y, &width, &height, &rx, &ry, nullptr);
 174
 175   if (width <= 0 || height <= 0) {
 176     return nullptr;
 177   }
 178
 179   rx = std::max(rx, 0.0f);
 180   ry = std::max(ry, 0.0f);
 181
 182   if (rx == 0 && ry == 0) {
 183     // Optimization for the no rounded corners case.
 184     Rect r(x, y, width, height);
 185     aBuilder->MoveTo(r.TopLeft());
 186     aBuilder->LineTo(r.TopRight());
 187     aBuilder->LineTo(r.BottomRight());
 188     aBuilder->LineTo(r.BottomLeft());
 189     aBuilder->Close();
 190   } else {
 191     // If either the 'rx' or the 'ry' attribute isn't set, then we have to
 192     // set it to the value of the other:
 193     bool hasRx = mLengthAttributes[ATTR_RX].IsExplicitlySet();
 194     bool hasRy = mLengthAttributes[ATTR_RY].IsExplicitlySet();
 195     MOZ_ASSERT(hasRx || hasRy);
 196
 197     if (hasRx && !hasRy) {
 198       ry = rx;
 199     } else if (hasRy && !hasRx) {
 200       rx = ry;
 201     }
 202
 203     // Clamp rx and ry to half the rect's width and height respectively:
 204     rx = std::min(rx, width / 2);
 205     ry = std::min(ry, height / 2);
 206
 207     RectCornerRadii radii(rx, ry);
 208     AppendRoundedRectToPath(aBuilder, Rect(x, y, width, height), radii);
 209   }
 210
 211   return aBuilder->Finish();
 212 }
 213
 214 } // namespace dom
 215 } // namespace mozilla