Add SkNx_cast().

tests/SkNxTest.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "Sk4px.h"
 #include "SkNx.h"
 #include "SkRandom.h"
 #include "Test.h"
 
 template <int N>
 static void test_Nf(skiatest::Reporter* r) {
 
-    auto assert_nearly_eq = [&](float eps, const SkNf<N>& v, float a, float b, float c, float d) {
+    auto assert_nearly_eq = [&](float eps, const SkNx<N, float>& v,
+                                float a, float b, float c, float d) {
         auto close = [=](float a, float b) { return fabsf(a-b) <= eps; };
         float vals[4];
         v.store(vals);
         bool ok = close(vals[0], a) && close(vals[1], b)
                && close(v.template kth<0>(), a) && close(v.template kth<1>(), b);
         REPORTER_ASSERT(r, ok);
         if (N == 4) {
             ok = close(vals[2], c) && close(vals[3], d)
               && close(v.template kth<2>(), c) && close(v.template kth<3>(), d);
             REPORTER_ASSERT(r, ok);
         }
     };
-    auto assert_eq = [&](const SkNf<N>& v, float a, float b, float c, float d) {
+    auto assert_eq = [&](const SkNx<N, float>& v, float a, float b, float c, float d) {
         return assert_nearly_eq(0, v, a,b,c,d);
     };
 
     float vals[] = {3, 4, 5, 6};
-    SkNf<N> a = SkNf<N>::Load(vals),
-            b(a),
-            c = a;
-    SkNf<N> d;
+    SkNx<N,float> a = SkNx<N,float>::Load(vals),
+                  b(a),
+                  c = a;
+    SkNx<N,float> d;
     d = a;
 
     assert_eq(a, 3, 4, 5, 6);
     assert_eq(b, 3, 4, 5, 6);
     assert_eq(c, 3, 4, 5, 6);
     assert_eq(d, 3, 4, 5, 6);
 
     assert_eq(a+b, 6, 8, 10, 12);
     assert_eq(a*b, 9, 16, 25, 36);
     assert_eq(a*b-b, 6, 12, 20, 30);
     assert_eq((a*b).sqrt(), 3, 4, 5, 6);
     assert_eq(a/b, 1, 1, 1, 1);
-    assert_eq(SkNf<N>(0)-a, -3, -4, -5, -6);
+    assert_eq(SkNx<N,float>(0)-a, -3, -4, -5, -6);
 
-    SkNf<N> fours(4);
+    SkNx<N,float> fours(4);
 
     assert_eq(fours.sqrt(), 2,2,2,2);
     assert_nearly_eq(0.001f, fours.rsqrt0(), 0.5, 0.5, 0.5, 0.5);
     assert_nearly_eq(0.001f, fours.rsqrt1(), 0.5, 0.5, 0.5, 0.5);
     assert_nearly_eq(0.001f, fours.rsqrt2(), 0.5, 0.5, 0.5, 0.5);
 
     assert_eq(               fours.      invert(), 0.25, 0.25, 0.25, 0.25);
     assert_nearly_eq(0.001f, fours.approxInvert(), 0.25, 0.25, 0.25, 0.25);
 
-    assert_eq(SkNf<N>::Min(a, fours), 3, 4, 4, 4);
-    assert_eq(SkNf<N>::Max(a, fours), 4, 4, 5, 6);
+    assert_eq(SkNx<N,float>::Min(a, fours), 3, 4, 4, 4);
+    assert_eq(SkNx<N,float>::Max(a, fours), 4, 4, 5, 6);
 
     // Test some comparisons.  This is not exhaustive.
     REPORTER_ASSERT(r, (a == b).allTrue());
     REPORTER_ASSERT(r, (a+b == a*b-b).anyTrue());
     REPORTER_ASSERT(r, !(a+b == a*b-b).allTrue());
     REPORTER_ASSERT(r, !(a+b == a*b).anyTrue());
     REPORTER_ASSERT(r, !(a != b).anyTrue());
     REPORTER_ASSERT(r, (a < fours).anyTrue());
     REPORTER_ASSERT(r, (a <= fours).anyTrue());
     REPORTER_ASSERT(r, !(a > fours).allTrue());
     REPORTER_ASSERT(r, !(a >= fours).allTrue());
 }
 
 DEF_TEST(SkNf, r) {
     test_Nf<2>(r);
     test_Nf<4>(r);
 }
 
 template <int N, typename T>
 void test_Ni(skiatest::Reporter* r) {
-    auto assert_eq = [&](const SkNi<N,T>& v, T a, T b, T c, T d, T e, T f, T g, T h) {
+    auto assert_eq = [&](const SkNx<N,T>& v, T a, T b, T c, T d, T e, T f, T g, T h) {
         T vals[8];
         v.store(vals);
 
         switch (N) {
           case 8: REPORTER_ASSERT(r, vals[4] == e && vals[5] == f && vals[6] == g && vals[7] == h);
           case 4: REPORTER_ASSERT(r, vals[2] == c && vals[3] == d);
           case 2: REPORTER_ASSERT(r, vals[0] == a && vals[1] == b);
         }
         switch (N) {
           case 8: REPORTER_ASSERT(r, v.template kth<4>() == e && v.template kth<5>() == f &&
                                      v.template kth<6>() == g && v.template kth<7>() == h);
           case 4: REPORTER_ASSERT(r, v.template kth<2>() == c && v.template kth<3>() == d);
           case 2: REPORTER_ASSERT(r, v.template kth<0>() == a && v.template kth<1>() == b);
         }
     };
 
     T vals[] = { 1,2,3,4,5,6,7,8 };
-    SkNi<N,T> a = SkNi<N,T>::Load(vals),
+    SkNx<N,T> a = SkNx<N,T>::Load(vals),
               b(a),
               c = a;
-    SkNi<N,T> d;
+    SkNx<N,T> d;
     d = a;
 
     assert_eq(a, 1,2,3,4,5,6,7,8);
     assert_eq(b, 1,2,3,4,5,6,7,8);
     assert_eq(c, 1,2,3,4,5,6,7,8);
     assert_eq(d, 1,2,3,4,5,6,7,8);
 
     assert_eq(a+a, 2,4,6,8,10,12,14,16);
     assert_eq(a*a, 1,4,9,16,25,36,49,64);
     assert_eq(a*a-a, 0,2,6,12,20,30,42,56);
 
     assert_eq(a >> 2, 0,0,0,1,1,1,1,2);
     assert_eq(a << 1, 2,4,6,8,10,12,14,16);
 
     REPORTER_ASSERT(r, a.template kth<1>() == 2);
 }
 
-DEF_TEST(SkNi, r) {
+DEF_TEST(SkNx, r) {
     test_Ni<2, uint16_t>(r);
     test_Ni<4, uint16_t>(r);
     test_Ni<8, uint16_t>(r);
 
     test_Ni<2, int>(r);
     test_Ni<4, int>(r);
     test_Ni<8, int>(r);
 }
 
 DEF_TEST(SkNi_min_lt, r) {
@@ skipping 79 matching lines @@
     Sk4f(0.7f).toBytes(bytes);
     REPORTER_ASSERT(r, bytes[0] == 0);
 
     // Clamping edge cases.
     Sk4f(-2.0f, -0.7f, 255.9f, 256.0f).toBytes(bytes);
     REPORTER_ASSERT(r, bytes[0] == 0);
     REPORTER_ASSERT(r, bytes[1] == 0);
     REPORTER_ASSERT(r, bytes[2] == 255);
     REPORTER_ASSERT(r, bytes[3] == 255);
 }
+
+DEF_TEST(SkNx_cast, r) {
+    Sk4f fs(-1.7f, -1.4f, 0.5f, 1.9f);
+    Sk4i is = SkNx_cast<int>(fs);
+
+    REPORTER_ASSERT(r, is.kth<0>() == -1);
+    REPORTER_ASSERT(r, is.kth<1>() == -1);
+    REPORTER_ASSERT(r, is.kth<2>() ==  0);
+    REPORTER_ASSERT(r, is.kth<3>() ==  1);
+}