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, 3 insertions, 3 deletions

diff --git a/tests/GrMemoryPoolTest.cpp b/tests/GrMemoryPoolTest.cpp
index 8660ea2a3b..73f26a9b2e 100644
--- a/tests/GrMemoryPoolTest.cpp
+++ b/tests/GrMemoryPoolTest.cpp
@@ -47,7 +47,7 @@ public:
 
     SK_DECLARE_INST_COUNT_ROOT(A);
 
-    static A* Create(SkRandom* r);
+    static A* Create(SkMWCRandom* r);
 
     static void SetAllocator(size_t preallocSize, size_t minAllocSize) {
 #if SK_ENABLE_INST_COUNT
@@ -160,7 +160,7 @@ private:
     typedef A INHERITED;
 };
 
-A* A::Create(SkRandom* r) {
+A* A::Create(SkMWCRandom* r) {
     switch (r->nextRangeU(0, 4)) {
         case 0:
             return new A;
@@ -201,7 +201,7 @@ static void test_memory_pool(skiatest::Reporter* reporter) {
     // number of iterations
     static const int kCheckPeriod = 500;
 
-    SkRandom r;
+    SkMWCRandom r;
     for (size_t s = 0; s < SK_ARRAY_COUNT(gSizes); ++s) {
         A::SetAllocator(gSizes[s][0], gSizes[s][1]);
         for (size_t c = 0; c < SK_ARRAY_COUNT(gCreateFraction); ++c) {