gfx: Use SkMatrix44 helpers instead of accessing its bitflags.

ui/gfx/transform.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_GFX_TRANSFORM_H_
 #define UI_GFX_TRANSFORM_H_
 
 #include <iosfwd>
 #include <string>
 
@@ skipping 102 matching lines @@
   void PreconcatTransform(const Transform& transform);
 
   // Applies a transformation on the current transformation
   // (i.e. 'this = transform * this;').
   void ConcatTransform(const Transform& transform);
 
   // Returns true if this is the identity matrix.
   bool IsIdentity() const { return matrix_.isIdentity(); }
 
   // Returns true if the matrix is either identity or pure translation.
-  bool IsIdentityOrTranslation() const {
-    return !(matrix_.getType() & ~SkMatrix44::kTranslate_Mask);
-  }
+  bool IsIdentityOrTranslation() const { return matrix_.isTranslate(); }
 
   // Returns true if the matrix is either identity or pure translation,
   // allowing for an amount of inaccuracy as specified by the parameter.
   bool IsApproximatelyIdentityOrTranslation(SkMScalar tolerance) const;
 
   // Returns true if the matrix is either a positive scale and/or a translation.
   bool IsPositiveScaleOrTranslation() const {
     if (!IsScaleOrTranslation())
       return false;
     return matrix_.get(0, 0) > 0.0 && matrix_.get(1, 1) > 0.0 &&
            matrix_.get(2, 2) > 0.0;
   }
 
   // Returns true if the matrix is either identity or pure, non-fractional
   // translation.
   bool IsIdentityOrIntegerTranslation() const;
 
   // Returns true if the matrix had only scaling components.
   bool IsScale2d() const {
     return !(matrix_.getType() & ~SkMatrix44::kScale_Mask);
   }
 
   // Returns true if the matrix is has only scaling and translation components.
-  bool IsScaleOrTranslation() const {
-    int mask = SkMatrix44::kScale_Mask | SkMatrix44::kTranslate_Mask;
-    return (matrix_.getType() & ~mask) == 0;
-  }
+  bool IsScaleOrTranslation() const { return matrix_.isScaleTranslate(); }
 
   // Returns true if axis-aligned 2d rects will remain axis-aligned after being
   // transformed by this matrix.
   bool Preserves2dAxisAlignment() const;
 
   // Returns true if the matrix has any perspective component that would
   // change the w-component of a homogeneous point.
-  bool HasPerspective() const {
-    return (matrix_.getType() & SkMatrix44::kPerspective_Mask) != 0;
-  }
+  bool HasPerspective() const { return matrix_.hasPerspective(); }
 
   // Returns true if this transform is non-singular.
   bool IsInvertible() const { return matrix_.invert(NULL); }
 
   // Returns true if a layer with a forward-facing normal of (0, 0, 1) would
   // have its back side facing frontwards after applying the transform.
   bool IsBackFaceVisible() const;
 
   // Inverts the transform which is passed in. Returns true if successful.
   bool GetInverse(Transform* transform) const WARN_UNUSED_RESULT;
@@ skipping 97 matching lines @@
 };
 
 // This is declared here for use in gtest-based unit tests but is defined in
 // the gfx_test_support target. Depend on that to use this in your unit test.
 // This should not be used in production code - call ToString() instead.
 void PrintTo(const Transform& transform, ::std::ostream* os);
 
 }  // namespace gfx
 
 #endif  // UI_GFX_TRANSFORM_H_