alt SkEvalQuadAt that returns its answer, using Sk2f

tests/GeometryTest.cpp

Index: tests/GeometryTest.cpp
diff --git a/tests/GeometryTest.cpp b/tests/GeometryTest.cpp
index 5151b70805efe39eb31df6443a67f052f12712de..9be6000a0e2e0ec6cc2b8ab5c71e9635c96206a7 100644
--- a/tests/GeometryTest.cpp
+++ b/tests/GeometryTest.cpp
@@ -7,6 +7,7 @@
 
 #include "SkGeometry.h"
 #include "Test.h"
+#include "SkRandom.h"
 
 static bool nearly_equal(const SkPoint& a, const SkPoint& b) {
     return SkScalarNearlyEqual(a.fX, b.fX) && SkScalarNearlyEqual(a.fY, b.fY);
@@ -33,6 +34,29 @@ static void testChopCubic(skiatest::Reporter* reporter) {
     }
 }
 
+static void test_evalquadat(skiatest::Reporter* reporter) {
+    SkRandom rand;
+    for (int i = 0; i < 1000; ++i) {
+        SkPoint pts[3];
+        for (int j = 0; j < 3; ++j) {
+            pts[j].set(rand.nextSScalar1() * 100, rand.nextSScalar1() * 100);
+        }
+        SkScalar t = 0;
+        const SkScalar dt = SK_Scalar1 / 128;
+        for (int j = 0; j < 128; ++j) {
+            SkPoint r0;
+            SkEvalQuadAt(pts, t, &r0);
+            SkPoint r1 = SkEvalQuadAt(pts, t);
+            bool eq = SkScalarNearlyEqual(r0.fX, r1.fX) && SkScalarNearlyEqual(r0.fY, r1.fY);
+            if (!eq) {
+                SkDebugf("[%d %g] p0 [%10.8f %10.8f] p1 [%10.8f %10.8f]\n", i, t, r0.fX, r0.fY, r1.fX, r1.fY);
+                REPORTER_ASSERT(reporter, eq);
+            }
+            t += dt;
+        }
+    }
+}
+
 DEF_TEST(Geometry, reporter) {
     SkPoint pts[3], dst[5];
 
@@ -58,4 +82,5 @@ DEF_TEST(Geometry, reporter) {
     }
 
     testChopCubic(reporter);
+    test_evalquadat(reporter);
 }