Initial attempt at jank-tracking stat collection
Is a bit naive, perhaps overly aggressive, but sorta works
Change-Id: I01a774e00dbe681439c02557d9728ae43c45ce50
diff --git a/libs/hwui/utils/RingBuffer.h b/libs/hwui/utils/RingBuffer.h
new file mode 100644
index 0000000..fc9aec0
--- /dev/null
+++ b/libs/hwui/utils/RingBuffer.h
@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2015 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.
+ */
+#ifndef RINGBUFFER_H_
+#define RINGBUFFER_H_
+
+#include "utils/Macros.h"
+
+#include <stddef.h>
+
+namespace android {
+namespace uirenderer {
+
+template<class T, size_t SIZE>
+class RingBuffer {
+ PREVENT_COPY_AND_ASSIGN(RingBuffer);
+
+public:
+ RingBuffer() {}
+ ~RingBuffer() {}
+
+ size_t capacity() { return SIZE; }
+ size_t size() { return mCount; }
+
+ T& next() {
+ mHead = (mHead + 1) % SIZE;
+ if (mCount < SIZE) {
+ mCount++;
+ }
+ return mBuffer[mHead];
+ }
+
+ T& front() {
+ return this[0];
+ }
+
+ T& back() {
+ return this[size() - 1];
+ }
+
+ T& operator[](size_t index) {
+ return mBuffer[(mHead + index + 1) % mCount];
+ }
+
+ void clear() {
+ mCount = 0;
+ mHead = -1;
+ }
+
+private:
+ T mBuffer[SIZE];
+ int mHead = -1;
+ size_t mCount = 0;
+};
+
+}; // namespace uirenderer
+}; // namespace android
+
+#endif /* RINGBUFFER_H_ */