Revert of fix zero-length tangent

tests/GeometryTest.cpp

Index: tests/GeometryTest.cpp
diff --git a/tests/GeometryTest.cpp b/tests/GeometryTest.cpp
index 5aa80d0b1fb732d77506e28a625d3e827865de88..00fc7797dc08d8b0ae0ff9f925ba4c88221ff32e 100644
--- a/tests/GeometryTest.cpp
+++ b/tests/GeometryTest.cpp
@@ -105,67 +105,6 @@
     }
 }
 
-static void test_quad_tangents(skiatest::Reporter* reporter) {
-    SkPoint pts[] = {
-        {10, 20}, {10, 20}, {20, 30},
-        {10, 20}, {15, 25}, {20, 30},
-        {10, 20}, {20, 30}, {20, 30},
-    };
-    int count = (int) SK_ARRAY_COUNT(pts) / 3;
-    for (int index = 0; index < count; ++index) {
-        SkConic conic(&pts[index * 3], 0.707f);
-        SkVector start = SkEvalQuadTangentAt(&pts[index * 3], 0);
-        SkVector mid = SkEvalQuadTangentAt(&pts[index * 3], .5f);
-        SkVector end = SkEvalQuadTangentAt(&pts[index * 3], 1);
-        REPORTER_ASSERT(reporter, start.fX && start.fY);
-        REPORTER_ASSERT(reporter, mid.fX && mid.fY);
-        REPORTER_ASSERT(reporter, end.fX && end.fY);
-        REPORTER_ASSERT(reporter, SkScalarNearlyZero(start.cross(mid)));
-        REPORTER_ASSERT(reporter, SkScalarNearlyZero(mid.cross(end)));
-    }
-}
-
-static void test_conic_tangents(skiatest::Reporter* reporter) {
-    SkPoint pts[] = {
-        { 10, 20}, {10, 20}, {20, 30},
-        { 10, 20}, {15, 25}, {20, 30},
-        { 10, 20}, {20, 30}, {20, 30}
-    };
-    int count = (int) SK_ARRAY_COUNT(pts) / 3;
-    for (int index = 0; index < count; ++index) {
-        SkConic conic(&pts[index * 3], 0.707f);
-        SkVector start = conic.evalTangentAt(0);
-        SkVector mid = conic.evalTangentAt(.5f);
-        SkVector end = conic.evalTangentAt(1);
-        REPORTER_ASSERT(reporter, start.fX && start.fY);
-        REPORTER_ASSERT(reporter, mid.fX && mid.fY);
-        REPORTER_ASSERT(reporter, end.fX && end.fY);
-        REPORTER_ASSERT(reporter, SkScalarNearlyZero(start.cross(mid)));
-        REPORTER_ASSERT(reporter, SkScalarNearlyZero(mid.cross(end)));
-    }
-}
-
-static void test_cubic_tangents(skiatest::Reporter* reporter) {
-    SkPoint pts[] = {
-        { 10, 20}, {10, 20}, {20, 30}, {30, 40},
-        { 10, 20}, {15, 25}, {20, 30}, {30, 40},
-        { 10, 20}, {20, 30}, {30, 40}, {30, 40},
-    };
-    int count = (int) SK_ARRAY_COUNT(pts) / 4;
-    for (int index = 0; index < count; ++index) {
-        SkConic conic(&pts[index * 3], 0.707f);
-        SkVector start, mid, end;
-        SkEvalCubicAt(&pts[index * 4], 0, NULL, &start, NULL);
-        SkEvalCubicAt(&pts[index * 4], .5f, NULL, &mid, NULL);
-        SkEvalCubicAt(&pts[index * 4], 1, NULL, &end, NULL);
-        REPORTER_ASSERT(reporter, start.fX && start.fY);
-        REPORTER_ASSERT(reporter, mid.fX && mid.fY);
-        REPORTER_ASSERT(reporter, end.fX && end.fY);
-        REPORTER_ASSERT(reporter, SkScalarNearlyZero(start.cross(mid)));
-        REPORTER_ASSERT(reporter, SkScalarNearlyZero(mid.cross(end)));
-    }
-}
-
 DEF_TEST(Geometry, reporter) {
     SkPoint pts[3], dst[5];
 
@@ -190,7 +129,4 @@
     testChopCubic(reporter);
     test_evalquadat(reporter);
     test_conic(reporter);
-    test_cubic_tangents(reporter);
-    test_quad_tangents(reporter);
-    test_conic_tangents(reporter);
 }