CanvasPath.h - mozsearch

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/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this file,

 * You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef CanvasPath_h

#define CanvasPath_h

#include "mozilla/Attributes.h"

#include "mozilla/RefPtr.h"

#include "nsWrapperCache.h"

#include "mozilla/gfx/2D.h"

#include "mozilla/dom/BindingDeclarations.h"

namespace mozilla {

class ErrorResult;

namespace dom {

enum class CanvasWindingRule : uint8_t;

struct DOMMatrix2DInit;

class

    UnrestrictedDoubleOrDOMPointInitOrUnrestrictedDoubleOrDOMPointInitSequence;

class CanvasPath final : public nsWrapperCache {

 public:

  NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(CanvasPath)

  NS_DECL_CYCLE_COLLECTION_NATIVE_WRAPPERCACHE_CLASS(CanvasPath)

  nsISupports* GetParentObject() { return mParent; }

  JSObject* WrapObject(JSContext* aCx,

                       JS::Handle<JSObject*> aGivenProto) override;

  static already_AddRefed<CanvasPath> Constructor(const GlobalObject& aGlobal);

  static already_AddRefed<CanvasPath> Constructor(const GlobalObject& aGlobal,

                                                  CanvasPath& aCanvasPath);

  static already_AddRefed<CanvasPath> Constructor(const GlobalObject& aGlobal,

                                                  const nsAString& aPathString);

  void ClosePath();

  void MoveTo(double x, double y);

  void LineTo(double x, double y);

  void QuadraticCurveTo(double cpx, double cpy, double x, double y);

  void BezierCurveTo(double cp1x, double cp1y, double cp2x, double cp2y,

                     double x, double y);

  void ArcTo(double x1, double y1, double x2, double y2, double radius,

             ErrorResult& error);

  void Rect(double x, double y, double w, double h);

  void RoundRect(

      double aX, double aY, double aW, double aH,

      const UnrestrictedDoubleOrDOMPointInitOrUnrestrictedDoubleOrDOMPointInitSequence&

          aRadii,

      ErrorResult& aError);

  void Arc(double x, double y, double radius, double startAngle,

           double endAngle, bool anticlockwise, ErrorResult& error);

  void Ellipse(double x, double y, double radiusX, double radiusY,

               double rotation, double startAngle, double endAngle,

               bool anticlockwise, ErrorResult& error);

  void LineTo(const gfx::Point& aPoint);

  void BezierTo(const gfx::Point& aCP1, const gfx::Point& aCP2,

                const gfx::Point& aCP3);

  already_AddRefed<gfx::Path> GetPath(const CanvasWindingRule& aWinding,

                                      const gfx::DrawTarget* aTarget) const;

  explicit CanvasPath(nsISupports* aParent);

  // already_AddRefed arg because the return value from Path::CopyToBuilder()

  // is passed directly and we can't drop the only ref to have a raw pointer.

  CanvasPath(nsISupports* aParent,

             already_AddRefed<gfx::PathBuilder> aPathBuilder);

  void AddPath(CanvasPath& aCanvasPath, const DOMMatrix2DInit& aInit,

               ErrorResult& aError);

 private:

  virtual ~CanvasPath() = default;

  nsCOMPtr<nsISupports> mParent;

  static gfx::Float ToFloat(double aValue) { return gfx::Float(aValue); }

  mutable RefPtr<gfx::Path> mPath;

  mutable RefPtr<gfx::PathBuilder> mPathBuilder;

  // Whether an internal segment was zero-length.

  mutable bool mPruned = false;

  void EnsurePathBuilder() const;

  void EnsureCapped() const;

  void EnsureActive() const;

};

}  // namespace dom

}  // namespace mozilla

#endif /* CanvasPath_h */