Change random number generator for 'tests' to SkMWCRandom. Also removes some

unused headers and fixes a couple of bugs exposed by changing the random 
number generator:

First, the function SkMatrix::getMaxStretch() had an error where it was testing
the square of a number against near-zero. This led to it occasionally taking a
cheaper but imprecise path for computing the eigenvalues of the matrix. It's 
been replaced with a check against the square of SK_ScalarNearlyZero. 

The second case was a failure in ClipStackTest, where it hit the rare case of 
a practically empty clip stack (it has a single Union) and we set a tight 
bounds. The bounds rect doesn't get set by GrReducedClip::ReduceClipStack() in 
this case, so when it clips the reduced stack it's clipping against garbage, 
and the resulting regions don't match. The solution is to initialize the 
tightBounds rect.


git-svn-id: http://skia.googlecode.com/svn/trunk@7952 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 1 insertions, 1 deletions

diff --git a/src/core/SkMatrix.cpp b/src/core/SkMatrix.cpp
index d420dd3b92..d9675f3979 100644
--- a/src/core/SkMatrix.cpp
+++ b/src/core/SkMatrix.cpp
@@ -1808,7 +1808,7 @@ SkScalar SkMatrix::getMaxStretch() const {
     SkScalar largerRoot;
     SkScalar bSqd = SkScalarMul(b,b);
     // if upper left 2x2 is orthogonal save some math
-    if (bSqd <= SK_ScalarNearlyZero) {
+    if (bSqd <= SK_ScalarNearlyZero*SK_ScalarNearlyZero) {
         largerRoot = SkMaxScalar(a, c);
     } else {
         SkScalar aminusc = a - c;