Enable flattening and unflattening of SkColorSpace

include/core/SkMatrix44.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 SkMatrix44_DEFINED
 #define SkMatrix44_DEFINED
 
@@ skipping 421 matching lines @@
 private:
     SkMScalar           fMat[4][4];
     mutable unsigned    fTypeMask;
 
     enum {
         kUnknown_Mask = 0x80,
 
         kAllPublic_Masks = 0xF
     };
 
+    /** Efficiently reads 12 matrix entries, ignoring the last col.
+     *  This is typically useful when we know the last col is (0, 0, 0, 1).
+     */
+    void as4x3ColMajorf(float[]) const;
+
+    /* This sets the top-left of the matrix and clears the
+     * perspective components (with [3][3] set to 1). */
+    void set4x3ColMajorf(const float[]);
+
     SkMScalar transX() const { return fMat[3][0]; }
     SkMScalar transY() const { return fMat[3][1]; }
     SkMScalar transZ() const { return fMat[3][2]; }
 
     SkMScalar scaleX() const { return fMat[0][0]; }
     SkMScalar scaleY() const { return fMat[1][1]; }
     SkMScalar scaleZ() const { return fMat[2][2]; }
 
     SkMScalar perspX() const { return fMat[0][3]; }
     SkMScalar perspY() const { return fMat[1][3]; }
@@ skipping 10 matching lines @@
         fTypeMask = mask;
     }
 
     /**
      *  Does not take the time to 'compute' the typemask. Only returns true if
      *  we already know that this matrix is identity.
      */
     inline bool isTriviallyIdentity() const {
         return 0 == fTypeMask;
     }
+
+    friend class SkColorSpace;
 };
 
 #endif