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

mapPts definitely faster than mapPoints (identity and perspective same speed). Up to 3x for large values of N.

cloned from https://codereview.chromium.org/1031443002/

BUG=skia:

Review URL: https://codereview.chromium.org/1030653002

1 files changed, 44 insertions, 0 deletions

diff --git a/tests/MatrixTest.cpp b/tests/MatrixTest.cpp
index 95d33acabd..35306b3275 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) {