Move MakeDivByTextureWHMatrix to GrCoordTransform

include/gpu/GrCoordTransform.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrCoordTransform_DEFINED
 #define GrCoordTransform_DEFINED
 
@@ skipping 46 matching lines @@
      * coord convention.
      */
     GrCoordTransform(GrCoordSet sourceCoords, const SkMatrix& m, const GrTexture* texture = NULL) {
         SkDEBUGCODE(fInEffect = false);
         this->reset(sourceCoords, m, texture);
     }
 
     void reset(GrCoordSet sourceCoords, const GrTexture* texture) {
         SkASSERT(!fInEffect);
         SkASSERT(NULL != texture);
-        this->reset(sourceCoords, GrEffect::MakeDivByTextureWHMatrix(texture), texture);
+        this->reset(sourceCoords, MakeDivByTextureWHMatrix(texture), texture);
     }
 
     void reset(GrCoordSet sourceCoords, const SkMatrix& m, const GrTexture* texture = NULL) {
         SkASSERT(!fInEffect);
         fSourceCoords = sourceCoords;
         fMatrix = m;
         fReverseY = NULL != texture && kBottomLeft_GrSurfaceOrigin == texture->origin();
     }
 
     GrCoordTransform& operator= (const GrCoordTransform& other) {
@@ skipping 16 matching lines @@
     bool operator== (const GrCoordTransform& other) const {
         return fSourceCoords == other.fSourceCoords &&
                fMatrix.cheapEqualTo(other.fMatrix) &&
                fReverseY == other.fReverseY;
     }
 
     GrCoordSet sourceCoords() const { return fSourceCoords; }
     const SkMatrix& getMatrix() const { return fMatrix; }
     bool reverseY() const { return fReverseY; }
 
+    /** Useful for effects that want to insert a texture matrix that is implied by the texture
+        dimensions */
+    static inline SkMatrix MakeDivByTextureWHMatrix(const GrTexture* texture) {
+        SkASSERT(NULL != texture);
+        SkMatrix mat;
+        mat.setIDiv(texture->width(), texture->height());
+        return mat;
+    }
+
 private:
     GrCoordSet fSourceCoords;
     SkMatrix   fMatrix;
     bool       fReverseY;
 
     typedef SkNoncopyable INHERITED;
 
 #ifdef SK_DEBUG
 public:
     void setInEffect() const { fInEffect = true; }
 private:
     mutable bool fInEffect;
 #endif
 };
 
 #endif