android: Add ToJavaFloatArray JNI utility.

base/android/jni_array.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/android/jni_array.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "base/logging.h"
 
@@ skipping 66 matching lines @@
   return ScopedJavaLocalRef<jlongArray>(env, long_array);
 }
 
 // Returns a new Java long array converted from the given int64_t array.
 BASE_EXPORT ScopedJavaLocalRef<jlongArray> ToJavaLongArray(
     JNIEnv* env,
     const std::vector<int64_t>& longs) {
   return ToJavaLongArray(env, longs.data(), longs.size());
 }
 
+// Returns a new Java float array converted from the given C++ float array.
+BASE_EXPORT ScopedJavaLocalRef<jfloatArray> ToJavaFloatArray(
+    JNIEnv* env, const float* floats, size_t len) {
+  jfloatArray float_array = env->NewFloatArray(len);
+  CheckException(env);
+  DCHECK(float_array);
+
+  env->SetFloatArrayRegion(
+      float_array, 0, len, reinterpret_cast<const jfloat*>(floats));
+  CheckException(env);
+
+  return ScopedJavaLocalRef<jfloatArray>(env, float_array);
+}
+
+BASE_EXPORT ScopedJavaLocalRef<jfloatArray> ToJavaFloatArray(
+    JNIEnv* env,
+    const std::vector<float>& floats) {
+  return ToJavaFloatArray(env, floats.data(), floats.size());
+}
+
 ScopedJavaLocalRef<jobjectArray> ToJavaArrayOfByteArray(
     JNIEnv* env, const std::vector<std::string>& v) {
   ScopedJavaLocalRef<jclass> byte_array_clazz = GetClass(env, "[B");
   jobjectArray joa = env->NewObjectArray(v.size(),
                                          byte_array_clazz.obj(), NULL);
   CheckException(env);
 
   for (size_t i = 0; i < v.size(); ++i) {
     ScopedJavaLocalRef<jbyteArray> byte_array = ToJavaByteArray(
         env, reinterpret_cast<const uint8_t*>(v[i].data()), v[i].length());
@@ skipping 156 matching lines @@
   out->resize(len);
   for (size_t i = 0; i < len; ++i) {
     ScopedJavaLocalRef<jintArray> int_array(
         env, static_cast<jintArray>(env->GetObjectArrayElement(array, i)));
     JavaIntArrayToIntVector(env, int_array.obj(), &((*out)[i]));
   }
 }
 
 }  // namespace android
 }  // namespace base