Guard SkMatrix::get*Scale[s]() against negative nearly-zero values.
BUG=skia:4718
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2143133005
Review-Url: https://codereview.chromium.org/2143133005
diff --git a/tests/MatrixTest.cpp b/tests/MatrixTest.cpp
index c4eb9c7..414aab2 100644
--- a/tests/MatrixTest.cpp
+++ b/tests/MatrixTest.cpp
@@ -213,11 +213,17 @@
big.setAll(2.39394089e+36f, 8.85347779e+36f, 9.26526204e+36f,
3.9159619e+36f, 1.44823453e+37f, 1.51559342e+37f,
0.f, 0.f, 1.f);
- REPORTER_ASSERT(reporter, -SK_Scalar1 == perspX.getMinScale());
- REPORTER_ASSERT(reporter, -SK_Scalar1 == perspX.getMaxScale());
success = big.getMinMaxScales(scales);
REPORTER_ASSERT(reporter, !success);
+ // skbug.com/4718
+ SkMatrix givingNegativeNearlyZeros;
+ givingNegativeNearlyZeros.setAll(0.00436534f, 0.114138f, 0.37141f,
+ 0.00358857f, 0.0936228f, -0.0174198f,
+ 0.f, 0.f, 1.f);
+ success = givingNegativeNearlyZeros.getMinMaxScales(scales);
+ REPORTER_ASSERT(reporter, success && 0 == scales[0]);
+
SkMatrix perspY;
perspY.reset();
perspY.setPerspY(-SK_Scalar1 / 500);