clone saturating cast code for doubles

Bug: skia:
Change-Id: I4f35413995cf73c6f130476d6b36e530120aa7ed
Reviewed-on: https://skia-review.googlesource.com/57901
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Reed <reed@google.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/tests/MathTest.cpp b/tests/MathTest.cpp
index fcbd63ddca..0d0bdce67d 100644
--- a/tests/MathTest.cpp
+++ b/tests/MathTest.cpp
@@ -693,3 +693,27 @@ DEF_TEST(FloatSaturate, reporter) {
         REPORTER_ASSERT(reporter, r.fExpectedInt == i);
     }
 }
+
+DEF_TEST(DoubleSaturate, reporter) {
+    const struct {
+        double  fDouble;
+        int     fExpectedInt;
+    } recs[] = {
+        { 0, 0 },
+        { 100.5, 100 },
+        { SK_MaxS32, SK_MaxS32 },
+        { SK_MinS32, SK_MinS32 },
+        { SK_MaxS32 - 1, SK_MaxS32 - 1 },
+        { SK_MinS32 + 1, SK_MinS32 + 1 },
+        { SK_MaxS32 * 100.0, SK_MaxS32 },
+        { SK_MinS32 * 100.0, SK_MinS32 },
+        { SK_ScalarInfinity, SK_MaxS32 },
+        { SK_ScalarNegativeInfinity, SK_MinS32 },
+        { SK_ScalarNaN, SK_MaxS32 },
+    };
+
+    for (auto r : recs) {
+        int i = sk_double_saturate2int(r.fDouble);
+        REPORTER_ASSERT(reporter, r.fExpectedInt == i);
+    }
+}