Add FloatMath.exp.

Change-Id: I7f215e5fd4cb942ddee56eebaef04be565ac79f3

Author: Jeff Brown

api/current.txt

@@ -22810,6 +22810,7 @@ package android.util {
   public class FloatMath {
     method public static float ceil(float);
     method public static float cos(float);
+    method public static float exp(float);
     method public static float floor(float);
     method public static float sin(float);
     method public static float sqrt(float);

core/java/android/util/FloatMath.java

@@ -71,4 +71,13 @@ private FloatMath() {}
      * @return the square root of value
      */
     public static native float sqrt(float value);
+
+    /**
+     * Returns the closest float approximation of the raising "e" to the power
+     * of the argument.
+     *
+     * @param value to compute the exponential of
+     * @return the exponential of value
+     */
+    public static native float exp(float value);
 }

core/jni/android_util_FloatMath.cpp

@@ -25,14 +25,19 @@ class MathUtilsGlue {
     static float SqrtF(JNIEnv* env, jobject clazz, float x) {
         return sqrtf(x);
     }
+
+    static float ExpF(JNIEnv* env, jobject clazz, float x) {
+        return expf(x);
+    }
 };
 
 static JNINativeMethod gMathUtilsMethods[] = {
     {"floor", "(F)F", (void*) MathUtilsGlue::FloorF},
     {"ceil", "(F)F", (void*) MathUtilsGlue::CeilF},
     {"sin", "(F)F", (void*) MathUtilsGlue::SinF},
     {"cos", "(F)F", (void*) MathUtilsGlue::CosF},
-    {"sqrt", "(F)F", (void*) MathUtilsGlue::SqrtF}
+    {"sqrt", "(F)F", (void*) MathUtilsGlue::SqrtF},
+    {"exp", "(F)F", (void*) MathUtilsGlue::ExpF},
 };
 
 int register_android_util_FloatMath(JNIEnv* env)