text: /*
   * Copyright 2017 Google Inc.
   *
   * Use of this source code is governed by a BSD-style license that can be
   * found in the LICENSE file.
   */
  
  #ifndef GrStencilClip_DEFINED
  #define GrStencilClip_DEFINED
  
  #include "src/gpu/GrAppliedClip.h"
  #include "src/gpu/GrFixedClip.h"
  
  /**
   * Implements GrHardClip with the currently-existing stencil buffer contents and GrFixedClip.
   */
  class GrStencilClip final : public GrHardClip {
  public:
      explicit GrStencilClip(const SkISize& rtDims, uint32_t stencilStackID = SK_InvalidGenID)
              : fFixedClip(rtDims)
              , fStencilStackID(stencilStackID) {}
  
      GrStencilClip(const SkISize& rtDims, const SkIRect& scissorRect,
                    uint32_t stencilStackID = SK_InvalidGenID)
              : fFixedClip(rtDims, scissorRect)
              , fStencilStackID(stencilStackID) {}
  
      const GrFixedClip& fixedClip() const { return fFixedClip; }
      GrFixedClip& fixedClip() { return fFixedClip; }
  
      uint32_t stencilStackID() const { return fStencilStackID; }
      bool hasStencilClip() const { return SK_InvalidGenID != fStencilStackID; }
      void setStencilClip(uint32_t stencilStackID) { fStencilStackID = stencilStackID; }
  
      SkIRect getConservativeBounds() const final {
          return fFixedClip.getConservativeBounds();
      }
  
      Effect apply(GrAppliedHardClip* out, SkIRect* bounds) const final {
          Effect effect = fFixedClip.apply(out, bounds);
          if (effect == Effect::kClippedOut) {
              // Stencil won't bring back coverage
              return Effect::kClippedOut;
          }
          if (this->hasStencilClip()) {
              out->addStencilClip(fStencilStackID);
              effect = Effect::kClipped;
          }
          return effect;
      }
  
      PreClipResult preApply(const SkRect& drawBounds, GrAA aa) const final {
          if (this->hasStencilClip()) {
              return this->INHERITED::preApply(drawBounds, aa);
          } else {
              return fFixedClip.preApply(drawBounds, aa);
          }
      }
  
  private:
      GrFixedClip   fFixedClip;
      uint32_t      fStencilStackID;
  
      using INHERITED = GrClip;
  };
  
  #endif
  