gecko-dev/dom/canvas/CanvasGradient.h

/* 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 mozilla_dom_CanvasGradient_h
#define mozilla_dom_CanvasGradient_h

#include "mozilla/Attributes.h"
#include "nsTArray.h"
#include "mozilla/RefPtr.h"
#include "mozilla/dom/CanvasRenderingContext2DBinding.h"
#include "mozilla/dom/CanvasRenderingContext2D.h"
#include "mozilla/gfx/2D.h"
#include "nsWrapperCache.h"
#include "gfxGradientCache.h"

namespace mozilla {
namespace dom {

class CanvasGradient : public nsWrapperCache {
 public:
  NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(CanvasGradient)
  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS(CanvasGradient)

  enum class Type : uint8_t { LINEAR = 0, RADIAL };

  Type GetType() { return mType; }

  mozilla::gfx::GradientStops* GetGradientStopsForTarget(
      mozilla::gfx::DrawTarget* aRT) {
    if (mStops && mStops->GetBackendType() == aRT->GetBackendType()) {
      return mStops;
    }

    mStops = gfx::gfxGradientCache::GetOrCreateGradientStops(
        aRT, mRawStops, gfx::ExtendMode::CLAMP);

    return mStops;
  }

  // WebIDL
  void AddColorStop(float offset, const nsACString& colorstr, ErrorResult& rv);

  JSObject* WrapObject(JSContext* aCx,
                       JS::Handle<JSObject*> aGivenProto) override {
    return CanvasGradient_Binding::Wrap(aCx, this, aGivenProto);
  }

  CanvasRenderingContext2D* GetParentObject() { return mContext; }

 protected:
  friend struct CanvasBidiProcessor;

  CanvasGradient(CanvasRenderingContext2D* aContext, Type aType)
      : mContext(aContext), mType(aType) {}

  RefPtr<CanvasRenderingContext2D> mContext;
  nsTArray<mozilla::gfx::GradientStop> mRawStops;
  RefPtr<mozilla::gfx::GradientStops> mStops;
  Type mType;
  virtual ~CanvasGradient() = default;
};

}  // namespace dom
}  // namespace mozilla

#endif  // mozilla_dom_CanvasGradient_h