Gradient shaders: make fPtsToUnit const, pre-cache getType().

src/effects/gradients/SkGradientShaderPriv.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 SkGradientShaderPriv_DEFINED
 #define SkGradientShaderPriv_DEFINED
 
@@ skipping 103 matching lines @@
         enum {
             kStorageCount = 16
         };
         SkColor fColorStorage[kStorageCount];
         SkScalar fPosStorage[kStorageCount];
         SkMatrix fLocalMatrixStorage;
         SkAutoMalloc fDynamicStorage;
     };
 
 public:
-    SkGradientShaderBase(const Descriptor& desc);
+    SkGradientShaderBase(const Descriptor& desc, const SkMatrix& ptsToUnit);
     virtual ~SkGradientShaderBase();
 
     // The cache is initialized on-demand when getCache16/32 is called.
     class GradientShaderCache : public SkRefCnt {
     public:
         GradientShaderCache(U8CPU alpha, const SkGradientShaderBase& shader);
         ~GradientShaderCache();
 
         const uint16_t*     getCache16();
         const SkPMColor*    getCache32();
@@ skipping 81 matching lines @@
     // also be filled with the gradient colors
     GpuColorType getGpuColorType(SkColor colors[3]) const;
 
     uint32_t getGradFlags() const { return fGradFlags; }
 
 protected:
     SkGradientShaderBase(SkReadBuffer& );
     virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE;
     SK_TO_STRING_OVERRIDE()
 
-    SkMatrix    fPtsToUnit;     // set by subclass
+    const SkMatrix fPtsToUnit;
     TileMode    fTileMode;
     TileProc    fTileProc;
     int         fColorCount;
     uint8_t     fGradFlags;
 
     struct Rec {
         SkFixed     fPos;   // 0...1
         uint32_t    fScale; // (1 << 24) / range
     };
     Rec*        fRecs;
@@ skipping 209 matching lines @@
     GrGLProgramDataManager::UniformHandle fColorStartUni;
     GrGLProgramDataManager::UniformHandle fColorMidUni;
     GrGLProgramDataManager::UniformHandle fColorEndUni;
 
     typedef GrGLFragmentProcessor INHERITED;
 };
 
 #endif
 
 #endif