dom/canvas/CanvasPath.h

   1 /* This Source Code Form is subject to the terms of the Mozilla Public
   2  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
   3  * You can obtain one at http://mozilla.org/MPL/2.0/. */
   4
   5 #ifndef CanvasPath_h
   6 #define CanvasPath_h
   7
   8 #include "mozilla/Attributes.h"
   9 #include "mozilla/RefPtr.h"
  10 #include "nsWrapperCache.h"
  11 #include "mozilla/gfx/2D.h"
  12 #include "mozilla/dom/BindingDeclarations.h"
  13
  14 namespace mozilla {
  15 class ErrorResult;
  16
  17 namespace dom {
  18
  19 enum class CanvasWindingRule : uint8_t;
  20 struct DOMMatrix2DInit;
  21
  22 class CanvasPath final : public nsWrapperCache {
  23  public:
  24   NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(CanvasPath)
  25   NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS(CanvasPath)
  26
  27   nsCOMPtr<nsISupports> GetParentObject() { return mParent; }
  28
  29   JSObject* WrapObject(JSContext* aCx,
  30                        JS::Handle<JSObject*> aGivenProto) override;
  31
  32   static already_AddRefed<CanvasPath> Constructor(const GlobalObject& aGlobal);
  33   static already_AddRefed<CanvasPath> Constructor(const GlobalObject& aGlobal,
  34                                                   CanvasPath& aCanvasPath);
  35   static already_AddRefed<CanvasPath> Constructor(const GlobalObject& aGlobal,
  36                                                   const nsAString& aPathString);
  37
  38   void ClosePath();
  39   void MoveTo(double x, double y);
  40   void LineTo(double x, double y);
  41   void QuadraticCurveTo(double cpx, double cpy, double x, double y);
  42   void BezierCurveTo(double cp1x, double cp1y, double cp2x, double cp2y,
  43                      double x, double y);
  44   void ArcTo(double x1, double y1, double x2, double y2, double radius,
  45              ErrorResult& error);
  46   void Rect(double x, double y, double w, double h);
  47   void Arc(double x, double y, double radius, double startAngle,
  48            double endAngle, bool anticlockwise, ErrorResult& error);
  49   void Ellipse(double x, double y, double radiusX, double radiusY,
  50                double rotation, double startAngle, double endAngle,
  51                bool anticlockwise, ErrorResult& error);
  52
  53   void LineTo(const gfx::Point& aPoint);
  54   void BezierTo(const gfx::Point& aCP1, const gfx::Point& aCP2,
  55                 const gfx::Point& aCP3);
  56
  57   already_AddRefed<gfx::Path> GetPath(const CanvasWindingRule& aWinding,
  58                                       const gfx::DrawTarget* aTarget) const;
  59
  60   explicit CanvasPath(nsISupports* aParent);
  61   // already_AddRefed arg because the return value from Path::CopyToBuilder()
  62   // is passed directly and we can't drop the only ref to have a raw pointer.
  63   CanvasPath(nsISupports* aParent,
  64              already_AddRefed<gfx::PathBuilder> aPathBuilder);
  65
  66   void AddPath(CanvasPath& aCanvasPath, const DOMMatrix2DInit& aInit,
  67                ErrorResult& aError);
  68
  69  private:
  70   virtual ~CanvasPath() = default;
  71
  72   nsCOMPtr<nsISupports> mParent;
  73   static gfx::Float ToFloat(double aValue) { return gfx::Float(aValue); }
  74
  75   mutable RefPtr<gfx::Path> mPath;
  76   mutable RefPtr<gfx::PathBuilder> mPathBuilder;
  77
  78   void EnsurePathBuilder() const;
  79 };
  80
  81 }  // namespace dom
  82 }  // namespace mozilla
  83
  84 #endif /* CanvasPath_h */