Improve GrInOrderDrawBuffer::Cmd encapsulation

src/gpu/GrInOrderDrawBuffer.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 GrInOrderDrawBuffer_DEFINED
 #define GrInOrderDrawBuffer_DEFINED
 
@@ skipping 42 matching lines @@
 
     void discard(GrRenderTarget*) SK_OVERRIDE;
 
 protected:
     void willReserveVertexAndIndexSpace(int vertexCount,
                                         size_t vertexStride,
                                         int indexCount);
 
 private:
     typedef GrGpu::DrawArgs DrawArgs;
-    enum {
-        kDraw_Cmd              = 1,
-        kStencilPath_Cmd       = 2,
-        kSetState_Cmd          = 3,
-        kClear_Cmd             = 4,
-        kCopySurface_Cmd       = 5,
-        kDrawPath_Cmd          = 6,
-        kDrawPaths_Cmd         = 7,
-        kDrawBatch_Cmd         = 8,
-    };
 
     struct SetState;
 
     struct Cmd : ::SkNoncopyable {
+        enum {
+            kDraw_Cmd              = 1,
+            kStencilPath_Cmd       = 2,
+            kSetState_Cmd          = 3,
+            kClear_Cmd             = 4,
+            kCopySurface_Cmd       = 5,
+            kDrawPath_Cmd          = 6,
+            kDrawPaths_Cmd         = 7,
+            kDrawBatch_Cmd         = 8,
+        };
+
         Cmd(uint8_t type) : fType(type) {}
         virtual ~Cmd() {}
 
         virtual void execute(GrInOrderDrawBuffer*, const SetState*) = 0;
 
+        uint8_t type() const { return fType & kCmdMask; }
+
+        bool isTraced() const { return SkToBool(fType & kTraceCmdBit); }
+        void makeTraced() { fType |= kTraceCmdBit; }
+
+    private:
+        static const int kCmdMask = 0x7F;
+        static const int kTraceCmdBit = 0x80;
+
         uint8_t fType;
     };
 
     struct Draw : public Cmd {
         Draw(const DrawInfo& info) : Cmd(kDraw_Cmd), fInfo(info) {}
 
         void execute(GrInOrderDrawBuffer*, const SetState*) SK_OVERRIDE;
 
         DrawInfo     fInfo;
     };
@@ skipping 221 matching lines @@
             fDrawBatch->execute(this, fPrevState);
             fDrawBatch->fBatch->setNumberOfDraws(fBatchTarget.numberOfDraws());
             fDrawBatch = NULL;
         }
     }
 
     typedef GrFlushToGpuDrawTarget INHERITED;
 };
 
 #endif