remove meaningless matrix benches, add mapPts() and add new benches

tests/MatrixTest.cpp

Index: tests/MatrixTest.cpp
diff --git a/tests/MatrixTest.cpp b/tests/MatrixTest.cpp
index 95d33acabd7ac42e0545efbc93b2a84d32ca668b..35306b327551c111238dd27e8ee6f8bf4335de25 100644
--- a/tests/MatrixTest.cpp
+++ b/tests/MatrixTest.cpp
@@ -799,6 +799,48 @@ static void test_decompScale(skiatest::Reporter* reporter) {
     REPORTER_ASSERT(reporter, !check_decompScale(m));
 }
 
+static void test_mappts(skiatest::Reporter* reporter, const SkMatrix& m, const char type[], int n) {
+    const int MAX = 100;
+    SkPoint src[MAX];
+    SkPoint dst0[MAX], dst1[MAX];
+    SkASSERT(n <= MAX);
+
+    SkRandom rand;
+    for (int i = 0; i < n; ++i) {
+        src[i].fX = rand.nextSScalar1() * 100;
+        src[i].fY = rand.nextSScalar1() * 100;
+    }
+
+    m.mapPoints(dst0, src, n);
+    m.mapPts(   dst1, src, n);
+    for (int i = 0; i < n; ++i) {
+        bool eq = SkScalarNearlyEqual(dst0[i].fX, dst1[i].fX) &&
+                  SkScalarNearlyEqual(dst0[i].fY, dst1[i].fY);
+        if (!eq) {
+            SkDebugf("%s [%d] points (%g %g) pts (%g %g)\n", type, i, dst0[i].fX, dst0[i].fY, dst1[i].fX, dst1[i].fY);
+            REPORTER_ASSERT(reporter, eq);
+        }
+    }
+}
+
+static void test_mappts(skiatest::Reporter* reporter) {
+    const int counts[] = { 0, 1, 2, 3, 4, 100 };
+    for (size_t i = 0; i < SK_ARRAY_COUNT(counts); ++i) {
+        const int n = counts[i];
+        SkMatrix m;
+        m.reset();
+        test_mappts(reporter, m, "ident", n);
+        m.setTranslate(2, 3);
+        test_mappts(reporter, m, "trans", n);
+        m.postScale(2, 0.5f);
+        test_mappts(reporter, m, "scale", n);
+        m.postRotate(35);
+        test_mappts(reporter, m, "affine", n);
+        m.setPerspX(0.1f);
+        test_mappts(reporter, m, "persp", n);
+    }
+}
+
 DEF_TEST(Matrix, reporter) {
     SkMatrix    mat, inverse, iden1, iden2;
 
@@ -919,6 +961,8 @@ DEF_TEST(Matrix, reporter) {
     test_set9(reporter);
 
     test_decompScale(reporter);
+
+    test_mappts(reporter);
 }
 
 DEF_TEST(Matrix_Concat, r) {