clear stencil clip on draw target

src/gpu/GrDrawTarget.h

 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrDrawTarget_DEFINED
 #define GrDrawTarget_DEFINED
 
 #include "GrClipData.h"
+#include "GrClipMaskManager.h"
 #include "GrContext.h"
 #include "GrDrawState.h"
 #include "GrIndexBuffer.h"
 #include "GrPathRendering.h"
 #include "GrTraceMarker.h"
 
 #include "SkClipStack.h"
 #include "SkMatrix.h"
 #include "SkPath.h"
 #include "SkStrokeRec.h"
@@ skipping 663 matching lines @@
         bool isIssued() { return fDrawTarget && fDrawTarget->isIssued(fDrawID); }
 
     private:
         GrDrawTarget*  fDrawTarget;
         uint32_t       fDrawID;   // this may wrap, but we're doing direct comparison
                                   // so that should be okay
     };
 
     virtual DrawToken getCurrentDrawToken() { return DrawToken(this, 0); }
 
-    // The state of the scissor is controlled by the clip manager, no one else should set
-    // Scissor state
-    struct ScissorState {
-        ScissorState() : fEnabled(false) {}
-        void set(const SkIRect& rect) { fRect = rect; fEnabled = true; }
-        bool    fEnabled;
-        SkIRect fRect;
-    };
-
 protected:
     // Extend access to GrDrawState::convertToPEndeingExec to subclasses.
     void convertDrawStateToPendingExec(GrDrawState* ds) {
         ds->convertToPendingExec();
     }
 
     enum GeometrySrcType {
         kNone_GeometrySrcType,     //<! src has not been specified
         kReserved_GeometrySrcType, //<! src was set using reserve*Space
         kArray_GeometrySrcType,    //<! src was set using set*SourceToArray
@@ skipping 228 matching lines @@
     // The context owns us, not vice-versa, so this ptr is not ref'ed by DrawTarget.
     GrContext*                                                      fContext;
     // To keep track that we always have at least as many debug marker adds as removes
     int                                                             fGpuTraceMarkerCount;
     GrTraceMarkerSet                                                fActiveTraceMarkers;
     GrTraceMarkerSet                                                fStoredTraceMarkers;
 
     typedef SkRefCnt INHERITED;
 };
 
+class GrClipTarget : public GrDrawTarget {
+public:
+    GrClipTarget(GrContext* context) : INHERITED(context) {}
+    /**
+     * Clip Mask Manager(and no one else) needs to clear private stencil bits.
+     * ClipTarget subclass sets clip bit in the stencil buffer. The subclass
+     * is free to clear the remaining bits to zero if masked clears are more
+     * expensive than clearing all bits.
+     */
+    virtual void clearStencilClip(const SkIRect& rect, bool insideClip, GrRenderTarget* = NULL) = 0;
+
+private:
+    typedef GrDrawTarget INHERITED;
+};
+
 #endif