Add FloatMath.hypot.

Change-Id: I6a5a7ea2254300614dbbf540f40e39dbec2d2900

Author: Jeff Brown

api/current.txt

@@ -22876,6 +22876,7 @@ package android.util {
     method public static float cos(float);
     method public static float exp(float);
     method public static float floor(float);
+    method public static float hypot(float, float);
     method public static float sin(float);
     method public static float sqrt(float);
   }

core/java/android/util/FloatMath.java

@@ -80,4 +80,14 @@ private FloatMath() {}
      * @return the exponential of value
      */
     public static native float exp(float value);
+
+    /**
+     * Returns {@code sqrt(}<i>{@code x}</i><sup>{@code 2}</sup>{@code +} <i>
+     * {@code y}</i><sup>{@code 2}</sup>{@code )}.
+     *
+     * @param x a float number
+     * @param y a float number
+     * @return the hypotenuse
+     */
+    public static native float hypot(float x, float y);
 }

core/jni/android_util_FloatMath.cpp

@@ -29,6 +29,10 @@ class MathUtilsGlue {
     static float ExpF(JNIEnv* env, jobject clazz, float x) {
         return expf(x);
     }
+
+    static float HypotF(JNIEnv* env, jobject clazz, float x, float y) {
+        return hypotf(x, y);
+    }
 };
 
 static JNINativeMethod gMathUtilsMethods[] = {
@@ -38,6 +42,7 @@ static JNINativeMethod gMathUtilsMethods[] = {
     {"cos", "(F)F", (void*) MathUtilsGlue::CosF},
     {"sqrt", "(F)F", (void*) MathUtilsGlue::SqrtF},
     {"exp", "(F)F", (void*) MathUtilsGlue::ExpF},
+    {"hypot", "(FF)F", (void*) MathUtilsGlue::HypotF},
 };
 
 int register_android_util_FloatMath(JNIEnv* env)