text: /*
   * Copyright 2015 Google Inc.
   *
   * Use of this source code is governed by a BSD-style license that can be
   * found in the LICENSE file.
   */
  
  #ifndef SkPaintFilterCanvas_DEFINED
  #define SkPaintFilterCanvas_DEFINED
  
  #include "include/core/SkCanvasVirtualEnforcer.h"
  #include "include/utils/SkNWayCanvas.h"
  
  class SkAndroidFrameworkUtils;
  
  /** \class SkPaintFilterCanvas
  
      A utility proxy base class for implementing draw/paint filters.
  */
  class SK_API SkPaintFilterCanvas : public SkCanvasVirtualEnforcer<SkNWayCanvas> {
  public:
      /**
       * The new SkPaintFilterCanvas is configured for forwarding to the
       * specified canvas.  Also copies the target canvas matrix and clip bounds.
       */
      SkPaintFilterCanvas(SkCanvas* canvas);
  
      enum Type {
          kPicture_Type,
      };
  
      // Forwarded to the wrapped canvas.
      SkISize getBaseLayerSize() const override { return proxy()->getBaseLayerSize(); }
      GrRecordingContext* recordingContext() override { return proxy()->recordingContext(); }
      GrSurfaceDrawContext* internal_private_accessTopLayerRenderTargetContext() override {
          return proxy()->internal_private_accessTopLayerRenderTargetContext();
      }
  
  protected:
      /**
       *  Called with the paint that will be used to draw the specified type.
       *  The implementation may modify the paint as they wish.
       *
       *  The result bool is used to determine whether the draw op is to be
       *  executed (true) or skipped (false).
       *
       *  Note: The base implementation calls onFilter() for top-level/explicit paints only.
       *        To also filter encapsulated paints (e.g. SkPicture, SkTextBlob), clients may need to
       *        override the relevant methods (i.e. drawPicture, drawTextBlob).
       */
      virtual bool onFilter(SkPaint& paint) const = 0;
  
      void onDrawPaint(const SkPaint&) override;
      void onDrawBehind(const SkPaint&) override;
      void onDrawPoints(PointMode, size_t count, const SkPoint pts[], const SkPaint&) override;
      void onDrawRect(const SkRect&, const SkPaint&) override;
      void onDrawRRect(const SkRRect&, const SkPaint&) override;
      void onDrawDRRect(const SkRRect&, const SkRRect&, const SkPaint&) override;
      void onDrawRegion(const SkRegion&, const SkPaint&) override;
      void onDrawOval(const SkRect&, const SkPaint&) override;
      void onDrawArc(const SkRect&, SkScalar, SkScalar, bool, const SkPaint&) override;
      void onDrawPath(const SkPath&, const SkPaint&) override;
      void onDrawImage(const SkImage*, SkScalar left, SkScalar top, const SkPaint*) override;
      void onDrawImageRect(const SkImage*, const SkRect* src, const SkRect& dst,
                           const SkPaint*, SrcRectConstraint) override;
      void onDrawImageLattice(const SkImage*, const Lattice&, const SkRect&,
                              const SkPaint*) override;
      void onDrawVerticesObject(const SkVertices*, SkBlendMode, const SkPaint&) override;
      void onDrawPatch(const SkPoint cubics[12], const SkColor colors[4],
                               const SkPoint texCoords[4], SkBlendMode,
                               const SkPaint& paint) override;
      void onDrawPicture(const SkPicture*, const SkMatrix*, const SkPaint*) override;
      void onDrawDrawable(SkDrawable*, const SkMatrix*) override;
  
      void onDrawTextBlob(const SkTextBlob* blob, SkScalar x, SkScalar y,
                          const SkPaint& paint) override;
      void onDrawAtlas(const SkImage*, const SkRSXform[], const SkRect[], const SkColor[],
                       int, SkBlendMode, const SkRect*, const SkPaint*) override;
      void onDrawAnnotation(const SkRect& rect, const char key[], SkData* value) override;
      void onDrawShadowRec(const SkPath& path, const SkDrawShadowRec& rec) override;
  
      void onDrawEdgeAAQuad(const SkRect&, const SkPoint[4], QuadAAFlags, const SkColor4f&,
                            SkBlendMode) override;
      void onDrawEdgeAAImageSet(const ImageSetEntry[], int count, const SkPoint[], const SkMatrix[],
                                const SkPaint*, SrcRectConstraint) override;
  
      // Forwarded to the wrapped canvas.
      sk_sp<SkSurface> onNewSurface(const SkImageInfo&, const SkSurfaceProps&) override;
      bool onPeekPixels(SkPixmap* pixmap) override;
      bool onAccessTopLayerPixels(SkPixmap* pixmap) override;
      SkImageInfo onImageInfo() const override;
      bool onGetProps(SkSurfaceProps* props) const override;
  
  private:
      class AutoPaintFilter;
  
      SkCanvas* proxy() const { SkASSERT(fList.count() == 1); return fList[0]; }
  
      SkPaintFilterCanvas* internal_private_asPaintFilterCanvas() const override {
          return const_cast<SkPaintFilterCanvas*>(this);
      }
  
      friend class SkAndroidFrameworkUtils;
  };
  
  #endif
  