android: Add ToJavaFloatArray JNI utility.

base/android/jni_array_unittest.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 <stddef.h>
 #include <stdint.h>
 
 #include <limits>
@@ skipping 95 matching lines @@
                              ScopedJavaLocalRef<jintArray> jints,
                              std::vector<int> int_vector,
                              const size_t len) {
   jint value;
   for (size_t i = 0; i < len; ++i) {
     env->GetIntArrayRegion(jints.obj(), i, 1, &value);
     ASSERT_EQ(int_vector[i], value);
   }
 }
 
+void CheckFloatConversion(
+    JNIEnv* env,
+    const float* float_array,
+    const size_t len,
+    const ScopedJavaLocalRef<jfloatArray>& floats) {
+  ASSERT_TRUE(floats.obj());
+
+  jsize java_array_len = env->GetArrayLength(floats.obj());
+  ASSERT_EQ(static_cast<jsize>(len), java_array_len);
+
+  jfloat value;
+  for (size_t i = 0; i < len; ++i) {
+    env->GetFloatArrayRegion(floats.obj(), i, 1, &value);
+    ASSERT_EQ(float_array[i], value);
+  }
+}
+
+TEST(JniArray, FloatConversions) {
+  const float kFloats[] = { 0.0f, 1.0f, -10.0f};
+  const size_t kLen = arraysize(kFloats);
+
+  JNIEnv* env = AttachCurrentThread();
+  CheckFloatConversion(env, kFloats, kLen,
+                       ToJavaFloatArray(env, kFloats, kLen));
+
+  const std::vector<float> vec(kFloats, kFloats + kLen);
+  CheckFloatConversion(env, kFloats, kLen, ToJavaFloatArray(env, vec));
+}
+
 TEST(JniArray, JavaIntArrayToIntVector) {
   const int kInts[] = {0, 1, -1};
   const size_t kLen = arraysize(kInts);
 
   JNIEnv* env = AttachCurrentThread();
   ScopedJavaLocalRef<jintArray> jints(env, env->NewIntArray(kLen));
   ASSERT_TRUE(jints.obj());
 
   for (size_t i = 0; i < kLen; ++i) {
     jint j = static_cast<jint>(kInts[i]);
@@ skipping 167 matching lines @@
 
   EXPECT_EQ(kNumItems, out.size());
   CheckIntArrayConversion(env, int_array0, out[0], kLen0);
   CheckIntArrayConversion(env, int_array1, out[1], kLen1);
   CheckIntArrayConversion(env, int_array2, out[2], kLen2);
   CheckIntArrayConversion(env, int_array3, out[3], kLen3);
 }
 
 }  // namespace android
 }  // namespace base