Convert GrClip to an abstract base class

src/gpu/GrClipMaskManager.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef GrClipMaskManager_DEFINED
 #define GrClipMaskManager_DEFINED
 
 #include "GrPipelineBuilder.h"
 #include "GrReducedClip.h"
 #include "GrTexture.h"
 #include "SkClipStack.h"
 #include "SkDeque.h"
 #include "SkPath.h"
 #include "SkRefCnt.h"
 #include "SkTLList.h"
 #include "SkTypes.h"
 
-class GrClip;
+class GrAppliedClip;
+class GrClipStackClip;
 class GrDrawTarget;
 class GrPathRenderer;
 class GrPathRendererChain;
 class GrResourceProvider;
 class GrTexture;
 class SkPath;
 
 /**
- * Produced by GrClipMaskManager. It provides a set of modifications to the drawing state that
- * are used to create the final GrPipeline for a GrBatch. This is a work in progress. It will
- * eventually encapsulate all mechanisms for modifying the scissor, shaders, and stencil state
- * to implement clipping.
- */
-class GrAppliedClip : public SkNoncopyable {
-public:
-    GrAppliedClip() : fHasStencilClip(false) {}
-    const GrFragmentProcessor* clipCoverageFragmentProcessor() const { return fClipCoverageFP; }
-    const GrScissorState& scissorState() const { return fScissorState; }
-    bool hasStencilClip() const { return fHasStencilClip; }
-
-private:
-    SkAutoTUnref<const GrFragmentProcessor> fClipCoverageFP;
-    GrScissorState                          fScissorState;
-    bool                                    fHasStencilClip;
-    friend class GrClipMaskManager;
-
-    typedef SkNoncopyable INHERITED;
-};
-
-/**
  * The clip mask creator handles the generation of the clip mask. If anti
  * aliasing is requested it will (in the future) generate a single channel
  * (8bit) mask. If no anti aliasing is requested it will generate a 1-bit
  * mask in the stencil buffer. In the non anti-aliasing case, if the clip
  * mask can be represented as a rectangle then scissoring is used. In all
  * cases scissoring is used to bound the range of the clip mask.
  */
 class GrClipMaskManager : SkNoncopyable {
 public:
-    GrClipMaskManager(GrDrawTarget* owner);
+    GrClipMaskManager(GrDrawTarget* owner) : fDrawTarget(owner) {}
 
     /**
      * Creates a clip mask if necessary as a stencil buffer or alpha texture
      * and sets the GrGpu's scissor and stencil state. If the return is false
      * then the draw can be skipped. devBounds is optional but can help optimize
      * clipping.
      */
-    bool setupClipping(const GrPipelineBuilder&, const GrClip&, const SkRect* devBounds,
+    bool setupClipping(const GrPipelineBuilder&, const GrClipStackClip&, const SkRect* devBounds,
                        GrAppliedClip*);
 
 private:
     inline GrContext* getContext();
     inline const GrCaps* caps() const;
     inline GrResourceProvider* resourceProvider();
 
     static bool PathNeedsSWRenderer(GrContext* context,
                                     bool hasUserStencilSettings,
                                     const GrRenderTarget* rt,
                                     const SkMatrix& viewMatrix,
                                     const SkClipStack::Element* element,
                                     GrPathRenderer** prOut,
                                     bool needsStencil);
     static GrPathRenderer* GetPathRenderer(GrContext* context,
                                            GrTexture* texture,
                                            const SkMatrix& viewMatrix,
                                            const SkClipStack::Element* element);
 
-    /**
-     * Informs the helper function adjustStencilParams() about how the stencil
-     * buffer clip is being used.
-     */
-    enum StencilClipMode {
-        // Draw to the clip bit of the stencil buffer
-        kModifyClip_StencilClipMode,
-        // Clip against the existing representation of the clip in the high bit
-        // of the stencil buffer.
-        kRespectClip_StencilClipMode,
-        // Neither writing to nor clipping against the clip bit.
-        kIgnoreClip_StencilClipMode,
-    };
-
     // Attempts to install a series of coverage effects to implement the clip. Return indicates
     // whether the element list was successfully converted to processors. *fp may be nullptr even
     // when the function succeeds because all the elements were ignored. TODO: Make clip reduction
     // bounds-aware and stop checking bounds in this function. Similarly, we shouldn't need to pass
     // abortIfAA, but we don't yet know if all the AA elements will be eliminated.
     bool getAnalyticClipProcessor(const GrReducedClip::ElementList&,
                                   bool abortIfAA,
                                   SkVector& clipOffset,
                                   const SkRect* devBounds,
                                   const GrFragmentProcessor** fp);
@@ skipping 27 matching lines @@
                              const GrPipelineBuilder&,
                              const GrRenderTarget* rt,
                              const SkVector& clipToMaskOffset,
                              const GrReducedClip::ElementList& elements);
 
     GrTexture* createCachedMask(int width, int height, const GrUniqueKey& key, bool renderTarget);
 
     static const int kMaxAnalyticElements = 4;
 
     GrDrawTarget*   fDrawTarget;    // This is our owning draw target.
-    StencilClipMode fClipMode;
 
     typedef SkNoncopyable INHERITED;
 };
 #endif // GrClipMaskManager_DEFINED