1 files changed, 46 insertions, 0 deletions
diff --git a/libs/hwui/jni/android_nio_utils.cpp b/libs/hwui/jni/android_nio_utils.cpp
new file mode 100644
index 000000000000..c2b09c1d15d7
--- /dev/null
+++ b/libs/hwui/jni/android_nio_utils.cpp
@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "android_nio_utils.h"
+
+#include <nativehelper/JNIHelp.h>
+
+namespace android {
+
+AutoBufferPointer::AutoBufferPointer(JNIEnv* env, jobject nioBuffer, jboolean commit)
+        : fEnv(env), fCommit(commit) {
+    jlong pointer = jniGetNioBufferPointer(fEnv, nioBuffer);
+    if (pointer != 0L) {
+        // Buffer is backed by a direct buffer.
+        fArray = nullptr;
+        fElements = nullptr;
+        fPointer = reinterpret_cast<void*>(pointer);
+    } else {
+        // Buffer is backed by a managed array.
+        jint byteOffset = jniGetNioBufferBaseArrayOffset(fEnv, nioBuffer);
+        fArray = jniGetNioBufferBaseArray(fEnv, nioBuffer);
+        fElements = fEnv->GetPrimitiveArrayCritical(fArray, /* isCopy= */ nullptr);
+        fPointer = reinterpret_cast<void*>(reinterpret_cast<char*>(fElements) + byteOffset);
+    }
+}
+
+AutoBufferPointer::~AutoBufferPointer() {
+    if (nullptr != fArray) {
+        fEnv->ReleasePrimitiveArrayCritical(fArray, fElements, fCommit ? 0 : JNI_ABORT);
+    }
+}
+
+}  // namespace android