diff --git a/experimental/SkMatrix44.cpp b/experimental/SkMatrix44.cpp
index d7a50f3..803747f 100644
--- a/experimental/SkMatrix44.cpp
+++ b/experimental/SkMatrix44.cpp
@@ -18,15 +18,27 @@
 #include "SkMatrix44.h"
 
 SkMatrix44::SkMatrix44() {
-	this->setIdentity();
+    this->setIdentity();
 }
 
 SkMatrix44::SkMatrix44(const SkMatrix44& src) {
-	memcpy(this, &src, sizeof(src));
+    memcpy(this, &src, sizeof(src));
 }
 
 SkMatrix44::SkMatrix44(const SkMatrix44& a, const SkMatrix44& b) {
-	this->setConcat(a, b);
+    this->setConcat(a, b);
+}
+
+SkMScalar SkMatrix44::get(int row, int col) const {
+    SkASSERT(row <= 3 && row >= 0);
+    SkASSERT(col <= 3 && col >= 0);
+    return fMat[col][row];
+}
+
+void SkMatrix44::set(int row, int col, const SkMScalar& value) {
+    SkASSERT(row <= 3 && row >= 0);
+    SkASSERT(col <= 3 && col >= 0);
+    fMat[col][row] = value;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
@@ -40,47 +52,47 @@
 ///////////////////////////////////////////////////////////////////////////////
 
 void SkMatrix44::setIdentity() {
-	sk_bzero(fMat, sizeof(fMat));
-	fMat[0][0] = fMat[1][1] = fMat[2][2] = fMat[3][3] = 1;
+    sk_bzero(fMat, sizeof(fMat));
+    fMat[0][0] = fMat[1][1] = fMat[2][2] = fMat[3][3] = 1;
 }
 
 void SkMatrix44::set3x3(SkMScalar m00, SkMScalar m01, SkMScalar m02,
                         SkMScalar m10, SkMScalar m11, SkMScalar m12,
                         SkMScalar m20, SkMScalar m21, SkMScalar m22) {
-	sk_bzero(fMat, sizeof(fMat));
-	fMat[0][0] = m00; fMat[0][1] = m01; fMat[0][2] = m02; fMat[0][3] = 0;
-	fMat[1][0] = m10; fMat[1][1] = m11; fMat[1][2] = m12; fMat[1][3] = 0;
-	fMat[2][0] = m20; fMat[2][1] = m21; fMat[2][2] = m22; fMat[2][3] = 0;
+    sk_bzero(fMat, sizeof(fMat));
+    fMat[0][0] = m00; fMat[0][1] = m01; fMat[0][2] = m02; fMat[0][3] = 0;
+    fMat[1][0] = m10; fMat[1][1] = m11; fMat[1][2] = m12; fMat[1][3] = 0;
+    fMat[2][0] = m20; fMat[2][1] = m21; fMat[2][2] = m22; fMat[2][3] = 0;
     fMat[3][0] = 0;   fMat[3][1] = 0;   fMat[3][2] = 0;   fMat[3][3] = 1;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 void SkMatrix44::setTranslate(SkMScalar tx, SkMScalar ty, SkMScalar tz) {
-	this->setIdentity();
-	fMat[3][0] = tx;
-	fMat[3][1] = ty;
-	fMat[3][2] = tz;
-	fMat[3][3] = 1;
+    this->setIdentity();
+    fMat[3][0] = tx;
+    fMat[3][1] = ty;
+    fMat[3][2] = tz;
+    fMat[3][3] = 1;
 }
 
 void SkMatrix44::preTranslate(SkMScalar dx, SkMScalar dy, SkMScalar dz) {
-	SkMatrix44 mat;
-	mat.setTranslate(dx, dy, dz);
-	this->preConcat(mat);
+    SkMatrix44 mat;
+    mat.setTranslate(dx, dy, dz);
+    this->preConcat(mat);
 }
 
 void SkMatrix44::postTranslate(SkMScalar dx, SkMScalar dy, SkMScalar dz) {
-	fMat[3][0] += dx;
-	fMat[3][1] += dy;
-	fMat[3][2] += dz;
+    fMat[3][0] += dx;
+    fMat[3][1] += dy;
+    fMat[3][2] += dz;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 void SkMatrix44::setScale(SkMScalar sx, SkMScalar sy, SkMScalar sz) {
-	sk_bzero(fMat, sizeof(fMat));
-	fMat[0][0] = sx;
+    sk_bzero(fMat, sizeof(fMat));
+    fMat[0][0] = sx;
     fMat[1][1] = sy;
     fMat[2][2] = sz;
     fMat[3][3] = 1;
@@ -133,25 +145,26 @@
     double yzC = y * zC;
     double zxC = z * xC;
 
-    this->set3x3(x * xC + c,    xyC - zs,       zxC + ys,
-                 xyC + zs,      y * yC + c,     yzC - xs,
-                 zxC - ys,      yzC + xs,       z * zC + c);
+    // if you're looking at wikipedia, remember that we're column major.
+    this->set3x3(x * xC + c,    xyC + zs,       zxC - ys,
+                 xyC - zs,      y * yC + c,     yzC + xs,
+                 zxC + ys,      yzC - xs,       z * zC + c);
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 void SkMatrix44::setConcat(const SkMatrix44& a, const SkMatrix44& b) {
-	SkMScalar result[4][4];
-	for (int i = 0; i < 4; i++) {
-		for (int j = 0; j < 4; j++) {
-			double value = 0;
-			for (int k = 0; k < 4; k++) {
-				value += SkMScalarToDouble(a.fMat[k][i]) * b.fMat[j][k];
-			}
-			result[j][i] = SkDoubleToMScalar(value);
-		}
-	}
-	memcpy(fMat, result, sizeof(result));
+    SkMScalar result[4][4];
+    for (int i = 0; i < 4; i++) {
+        for (int j = 0; j < 4; j++) {
+            double value = 0;
+            for (int k = 0; k < 4; k++) {
+                value += SkMScalarToDouble(a.fMat[k][i]) * b.fMat[j][k];
+            }
+            result[j][i] = SkDoubleToMScalar(value);
+        }
+    }
+    memcpy(fMat, result, sizeof(result));
 }
 
 ///////////////////////////////////////////////////////////////////////////////
@@ -164,8 +177,8 @@
                             double m10, double m11, double m12,
                             double m20, double m21, double m22) {
     return  m00 * det2x2(m11, m12, m21, m22) -
-            m10 * det2x2(m01, m02, m21, m22) +
-            m20 * det2x2(m01, m02, m11, m12);
+    m10 * det2x2(m01, m02, m21, m22) +
+    m20 * det2x2(m01, m02, m11, m12);
 }
 
 /** We always perform the calculation in doubles, to avoid prematurely losing
@@ -176,15 +189,15 @@
     return  fMat[0][0] * det3x3(fMat[1][1], fMat[1][2], fMat[1][3],
                                 fMat[2][1], fMat[2][2], fMat[2][3],
                                 fMat[3][1], fMat[3][2], fMat[3][3]) -
-            fMat[1][0] * det3x3(fMat[0][1], fMat[0][2], fMat[0][3],
-                                fMat[2][1], fMat[2][2], fMat[2][3],
-                                fMat[3][1], fMat[3][2], fMat[3][3]) +
-            fMat[2][0] * det3x3(fMat[0][1], fMat[0][2], fMat[0][3],
-                                fMat[1][1], fMat[1][2], fMat[1][3],
-                                fMat[3][1], fMat[3][2], fMat[3][3]) -
-            fMat[3][0] * det3x3(fMat[0][1], fMat[0][2], fMat[0][3],
-                                fMat[1][1], fMat[1][2], fMat[1][3],
-                                fMat[2][1], fMat[2][2], fMat[2][3]);
+    fMat[1][0] * det3x3(fMat[0][1], fMat[0][2], fMat[0][3],
+                        fMat[2][1], fMat[2][2], fMat[2][3],
+                        fMat[3][1], fMat[3][2], fMat[3][3]) +
+    fMat[2][0] * det3x3(fMat[0][1], fMat[0][2], fMat[0][3],
+                        fMat[1][1], fMat[1][2], fMat[1][3],
+                        fMat[3][1], fMat[3][2], fMat[3][3]) -
+    fMat[3][0] * det3x3(fMat[0][1], fMat[0][2], fMat[0][3],
+                        fMat[1][1], fMat[1][2], fMat[1][3],
+                        fMat[2][1], fMat[2][2], fMat[2][3]);
 }
 
 ///////////////////////////////////////////////////////////////////////////////
@@ -226,7 +239,7 @@
     double m31 = fMat[3][1];
     double m32 = fMat[3][2];
     double m33 = fMat[3][3];
-    
+
     double tmp[4][4];
 
     tmp[0][0] = m12*m23*m31 - m13*m22*m31 + m13*m21*m32 - m11*m23*m32 - m12*m21*m33 + m11*m22*m33;
@@ -258,15 +271,15 @@
 ///////////////////////////////////////////////////////////////////////////////
 
 void SkMatrix44::map(const SkScalar src[4], SkScalar dst[4]) const {
-	SkScalar result[4];
-	for (int i = 0; i < 4; i++) {
-		SkMScalar value = 0;
-		for (int j = 0; j < 4; j++) {
-			value += fMat[j][i] * src[j];
-		}
-		result[i] = value;
-	}
-	memcpy(dst, result, sizeof(result));
+    SkScalar result[4];
+    for (int i = 0; i < 4; i++) {
+        SkMScalar value = 0;
+        for (int j = 0; j < 4; j++) {
+            value += fMat[j][i] * src[j];
+        }
+        result[i] = value;
+    }
+    memcpy(dst, result, sizeof(result));
 }
 
 ///////////////////////////////////////////////////////////////////////////////
@@ -279,17 +292,17 @@
              fMat[2][0], fMat[2][1], fMat[2][2], fMat[2][3],
              fMat[3][0], fMat[3][1], fMat[3][2], fMat[3][3]);
 #else
-            fMat[0][0], fMat[1][0], fMat[2][0], fMat[3][0],
-            fMat[0][1], fMat[1][1], fMat[2][1], fMat[3][1],
-            fMat[0][2], fMat[1][2], fMat[2][2], fMat[3][2],
-            fMat[0][3], fMat[1][3], fMat[2][3], fMat[3][3]);
+             fMat[0][0], fMat[1][0], fMat[2][0], fMat[3][0],
+             fMat[0][1], fMat[1][1], fMat[2][1], fMat[3][1],
+             fMat[0][2], fMat[1][2], fMat[2][2], fMat[3][2],
+             fMat[0][3], fMat[1][3], fMat[2][3], fMat[3][3]);
 #endif
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 static void initFromMatrix(SkMScalar dst[4][4], const SkMatrix& src) {
-	sk_bzero(dst, 16 * sizeof(SkMScalar));
+    sk_bzero(dst, 16 * sizeof(SkMScalar));
     dst[0][0] = src[SkMatrix::kMScaleX];
     dst[1][0] = src[SkMatrix::kMSkewX];
     dst[3][0] = src[SkMatrix::kMTransX];
diff --git a/experimental/SkMatrix44.h b/experimental/SkMatrix44.h
index af1e51e..af632d7 100644
--- a/experimental/SkMatrix44.h
+++ b/experimental/SkMatrix44.h
@@ -61,7 +61,7 @@
 ///////////////////////////////////////////////////////////////////////////////
 
 struct SkVector4 {
-	SkScalar fData[4];
+    SkScalar fData[4];
 
     SkVector4() {
         this->set(0, 0, 0, 1);
@@ -92,7 +92,7 @@
         return fData[0] == x && fData[1] == y &&
                fData[2] == z && fData[3] == w;
     }
-    
+
     void set(SkScalar x, SkScalar y, SkScalar z, SkScalar w = SK_Scalar1) {
         fData[0] = x;
         fData[1] = y;
@@ -103,9 +103,9 @@
 
 class SkMatrix44 {
 public:
-	SkMatrix44();
-	SkMatrix44(const SkMatrix44&);
-	SkMatrix44(const SkMatrix44& a, const SkMatrix44& b);
+    SkMatrix44();
+    SkMatrix44(const SkMatrix44&);
+    SkMatrix44(const SkMatrix44& a, const SkMatrix44& b);
 
     SkMatrix44& operator=(const SkMatrix44& src) {
         memcpy(this, &src, sizeof(*this));
@@ -123,21 +123,24 @@
     SkMatrix44& operator=(const SkMatrix& src);
     operator SkMatrix() const;
 
+    SkMScalar get(int row, int col) const;
+    void set(int row, int col, const SkMScalar& value);
+
     bool isIdentity() const;
-	void setIdentity();
-    void reset() { this->setIdentity(); }
+    void setIdentity();
+    void reset() { this->setIdentity();}
 
     void set3x3(SkMScalar m00, SkMScalar m01, SkMScalar m02,
                 SkMScalar m10, SkMScalar m11, SkMScalar m12,
                 SkMScalar m20, SkMScalar m21, SkMScalar m22);
 
-	void setTranslate(SkMScalar dx, SkMScalar dy, SkMScalar dz);
-	void preTranslate(SkMScalar dx, SkMScalar dy, SkMScalar dz);
-	void postTranslate(SkMScalar dx, SkMScalar dy, SkMScalar dz);
+    void setTranslate(SkMScalar dx, SkMScalar dy, SkMScalar dz);
+    void preTranslate(SkMScalar dx, SkMScalar dy, SkMScalar dz);
+    void postTranslate(SkMScalar dx, SkMScalar dy, SkMScalar dz);
 
-    void setScale(SkMScalar sx, SkMScalar sx, SkMScalar sx);
-    void preScale(SkMScalar sx, SkMScalar sx, SkMScalar sx);
-    void postScale(SkMScalar sx, SkMScalar sx, SkMScalar sx);
+    void setScale(SkMScalar sx, SkMScalar sy, SkMScalar sz);
+    void preScale(SkMScalar sx, SkMScalar sy, SkMScalar sz);
+    void postScale(SkMScalar sx, SkMScalar sy, SkMScalar sz);
 
     void setScale(SkMScalar scale) {
         this->setScale(scale, scale, scale);
@@ -150,7 +153,7 @@
     }
 
     void setRotateDegreesAbout(SkMScalar x, SkMScalar y, SkMScalar z,
-                        SkMScalar degrees) {
+                               SkMScalar degrees) {
         this->setRotateAbout(x, y, z, degrees * SK_MScalarPI / 180);
     }
 
@@ -165,16 +168,17 @@
     void setRotateAboutUnit(SkMScalar x, SkMScalar y, SkMScalar z,
                             SkMScalar radians);
 
-	void setConcat(const SkMatrix44& a, const SkMatrix44& b);
-	void preConcat(const SkMatrix44& m) {
+    void setConcat(const SkMatrix44& a, const SkMatrix44& b);
+    void preConcat(const SkMatrix44& m) {
         this->setConcat(*this, m);
     }
-	void postConcat(const SkMatrix44& m) {
+    void postConcat(const SkMatrix44& m) {
         this->setConcat(m, *this);
     }
-	friend SkMatrix44 operator*(const SkMatrix44& a, const SkMatrix44& b) {
-		return SkMatrix44(a, b);
-	}
+
+    friend SkMatrix44 operator*(const SkMatrix44& a, const SkMatrix44& b) {
+        return SkMatrix44(a, b);
+    }
 
     /** If this is invertible, return that in inverse and return true. If it is
         not invertible, return false and ignore the inverse parameter.
@@ -184,16 +188,16 @@
     /** Apply the matrix to the src vector, returning the new vector in dst.
         It is legal for src and dst to point to the same memory.
      */
-	void map(const SkScalar src[4], SkScalar dst[4]) const;
+    void map(const SkScalar src[4], SkScalar dst[4]) const;
     void map(SkScalar vec[4]) const {
         this->map(vec, vec);
-        }
+    }
 
-	friend SkVector4 operator*(const SkMatrix44& m, const SkVector4& src) {
+    friend SkVector4 operator*(const SkMatrix44& m, const SkVector4& src) {
         SkVector4 dst;
         m.map(src.fData, dst.fData);
         return dst;
-	}
+    }
 
     void dump() const;
 
@@ -203,7 +207,7 @@
          [3][1] = ty
          [3][2] = tz
      */
-	SkMScalar fMat[4][4];
+    SkMScalar fMat[4][4];
 
     double determinant() const;
 };
diff --git a/gyp/experimental.gyp b/gyp/experimental.gyp
index 50e60e8..12921ba 100644
--- a/gyp/experimental.gyp
+++ b/gyp/experimental.gyp
@@ -17,10 +17,6 @@
         '../experimental/SkSetPoly3To3_A.cpp',
         '../experimental/SkSetPoly3To3_D.cpp',
       ],
-      'sources!': [
-        '../experimental/SkMatrix44.cpp',  #doesn't compile
-        '../experimental/SkMatrix44.h',
-      ],
       'direct_dependent_settings': {
         'include_dirs': [
           '../experimental',
diff --git a/gyp/tests.gyp b/gyp/tests.gyp
index 2756b90..300bb5d 100644
--- a/gyp/tests.gyp
+++ b/gyp/tests.gyp
@@ -43,6 +43,7 @@
         '../tests/InfRectTest.cpp',
         '../tests/MathTest.cpp',
         '../tests/MatrixTest.cpp',
+        '../tests/Matrix44Test.cpp',
         '../tests/MetaDataTest.cpp',
         '../tests/PackBitsTest.cpp',
         '../tests/PaintTest.cpp',
@@ -68,6 +69,7 @@
       'dependencies': [
         'core.gyp:core',
         'effects.gyp:effects',
+        'experimental.gyp:experimental',
         'images.gyp:images',
         'utils.gyp:utils',
       ],
diff --git a/tests/Matrix44Test.cpp b/tests/Matrix44Test.cpp
new file mode 100644
index 0000000..8755bd3
--- /dev/null
+++ b/tests/Matrix44Test.cpp
@@ -0,0 +1,70 @@
+#include "Test.h"
+#include "SkMatrix44.h"
+
+static bool nearly_equal_scalar(SkScalar a, SkScalar b) {
+    // Note that we get more compounded error for multiple operations when
+    // SK_SCALAR_IS_FIXED.
+#ifdef SK_SCALAR_IS_FLOAT
+    const SkScalar tolerance = SK_Scalar1 / 200000;
+#else
+    const SkScalar tolerance = SK_Scalar1 / 1024;
+#endif
+
+    return SkScalarAbs(a - b) <= tolerance;
+}
+
+static bool nearly_equal(const SkMatrix44& a, const SkMatrix44& b) {
+    for (int i = 0; i < 4; ++i) {
+        for (int j = 0; j < 4; ++j) {
+            if (!nearly_equal_scalar(a.get(i, j), b.get(i, j))) {
+                printf("not equal %g %g\n", (float)a.get(i, j), (float)b.get(i, j));
+                return false;
+            }
+        }
+    }
+    return true;
+}
+
+static bool is_identity(const SkMatrix44& m) {
+    SkMatrix44 identity;
+    identity.reset();
+    return nearly_equal(m, identity);
+}
+
+
+void TestMatrix44(skiatest::Reporter* reporter) {
+    SkMatrix44 mat, inverse, iden1, iden2, rot;
+
+    mat.reset();
+    mat.setTranslate(SK_Scalar1, SK_Scalar1, SK_Scalar1);
+    mat.invert(&inverse);
+    iden1.setConcat(mat, inverse);
+    REPORTER_ASSERT(reporter, is_identity(iden1));
+
+    mat.setScale(SkIntToScalar(2), SkIntToScalar(2), SkIntToScalar(2));
+    mat.invert(&inverse);
+    iden1.setConcat(mat, inverse);
+    REPORTER_ASSERT(reporter, is_identity(iden1));
+
+    mat.setScale(SK_Scalar1/2, SK_Scalar1/2, SK_Scalar1/2);
+    mat.invert(&inverse);
+    iden1.setConcat(mat, inverse);
+    REPORTER_ASSERT(reporter, is_identity(iden1));
+
+    mat.setScale(SkIntToScalar(3), SkIntToScalar(5), SkIntToScalar(20));
+    rot.setRotateDegreesAbout(
+        SkIntToScalar(0),
+        SkIntToScalar(0),
+        SkIntToScalar(-1),
+        SkIntToScalar(90));
+    mat.postConcat(rot);
+    REPORTER_ASSERT(reporter, mat.invert(NULL));
+    mat.invert(&inverse);
+    iden1.setConcat(mat, inverse);
+    REPORTER_ASSERT(reporter, is_identity(iden1));
+    iden2.setConcat(inverse, mat);
+    REPORTER_ASSERT(reporter, is_identity(iden2));
+}
+
+#include "TestClassDef.h"
+DEFINE_TESTCLASS("Matrix44", Matrix44TestClass, TestMatrix44)