Added check for ill-conditioned invert

tests/MatrixTest.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkMath.h"
 #include "SkMatrix.h"
 #include "SkMatrixUtils.h"
@@ skipping 820 matching lines @@
     test_flatten(reporter, mat);
     test_flatten(reporter, iden2);
 
     mat.setScale(0, SK_Scalar1);
     REPORTER_ASSERT(reporter, !mat.invert(NULL));
     REPORTER_ASSERT(reporter, !mat.invert(&inverse));
     mat.setScale(SK_Scalar1, 0);
     REPORTER_ASSERT(reporter, !mat.invert(NULL));
     REPORTER_ASSERT(reporter, !mat.invert(&inverse));
 
+    // Inverting this matrix results in a non-finite matrix
+    mat.setAll(0.0f, 1.0f, 2.0f,
+               0.0f, 1.0f, -3.40277175e+38f,
+               1.00003040f, 1.0f, 0.0f);
+    REPORTER_ASSERT(reporter, !mat.invert(NULL));
+    REPORTER_ASSERT(reporter, !mat.invert(&inverse));
+
     // rectStaysRect test
     {
         static const struct {
             SkScalar    m00, m01, m10, m11;
             bool        mStaysRect;
         }
         gRectStaysRectSamples[] = {
             {          0,          0,          0,           0, false },
             {          0,          0,          0,  SK_Scalar1, false },
             {          0,          0, SK_Scalar1,           0, false },
@@ skipping 75 matching lines @@
     a.setTranslate(10, 20);
 
     SkMatrix b;
     b.setScale(3, 5);
 
     SkMatrix expected;
     expected.setConcat(a,b);
 
     REPORTER_ASSERT(r, expected == SkMatrix::Concat(a, b));
 }