Clip mask manager sets stencil on draw type

src/gpu/GrDrawState.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrDrawState_DEFINED
 #define GrDrawState_DEFINED
 
@@ skipping 328 matching lines @@
 
         bool isSet() const { return SkToBool(fDrawState); }
 
     private:
         GrDrawState*    fDrawState;
         uint32_t        fOriginalGPID;
         int             fColorEffectCnt;
         int             fCoverageEffectCnt;
     };
 
+    /**
+     * AutoRestoreStencil
+     *
+     * This simple struct saves and restores the stencil settings
+     */
+    class AutoRestoreStencil : public ::SkNoncopyable {
+    public:
+        AutoRestoreStencil()
+            : fDrawState(NULL) {}

[bsalomon, 2014/10/24 21:04:38]

can put the two cons each on one line if you want

+
+        AutoRestoreStencil(GrDrawState* ds)
+            : fDrawState(NULL) { this->set(ds); }
+
+        ~AutoRestoreStencil() { this->set(NULL); }
+
+        void set(GrDrawState* ds) {
+            if (fDrawState) {
+                fDrawState->setStencil(fStencilSettings);
+            }
+            fDrawState = ds;
+            if (ds) {
+                fStencilSettings = ds->getStencil();
+            }
+        }
+
+        bool isSet() const { return SkToBool(fDrawState); }
+
+    private:
+        GrDrawState*       fDrawState;
+        GrStencilSettings  fStencilSettings;
+    };
+
     /// @}
 
     ///////////////////////////////////////////////////////////////////////////
     /// @name Blending
     ////
 
     GrBlendCoeff getSrcBlendCoeff() const { return fSrcBlend; }
     GrBlendCoeff getDstBlendCoeff() const { return fDstBlend; }
 
     /**
@@ skipping 467 matching lines @@
     mutable uint32_t fCachedCapsID;
 
     friend class GrOptDrawState;
 
     typedef SkRefCnt INHERITED;
 };
 
 GR_MAKE_BITFIELD_OPS(GrDrawState::BlendOptFlags);
 
 #endif