1 files changed, 75 insertions, 0 deletions
diff --git a/libs/hwui/jni/android_graphics_HardwareRendererObserver.h b/libs/hwui/jni/android_graphics_HardwareRendererObserver.h
new file mode 100644
index 000000000000..62111fd7d7a1
--- /dev/null
+++ b/libs/hwui/jni/android_graphics_HardwareRendererObserver.h
@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2019 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 "jni.h"
+
+#include <FrameInfo.h>
+#include <FrameMetricsObserver.h>
+
+namespace android {
+
+/*
+ * Implements JNI layer for hwui frame metrics reporting.
+ */
+class HardwareRendererObserver : public uirenderer::FrameMetricsObserver {
+public:
+    HardwareRendererObserver(JavaVM *vm, jobject observer);
+    ~HardwareRendererObserver();
+
+    /**
+     * Retrieves frame metrics for the oldest frame that the renderer has retained. The renderer
+     * will retain a buffer until it has been retrieved, via this method, or its internal storage
+     * is exhausted at which point it informs the caller of how many frames it has failed to store
+     * since the last time this method was invoked.
+     * @param env java env required to populate the provided buffer array
+     * @param metrics output parameter that represents the buffer of metrics that is to be filled
+     * @param dropCount output parameter that is updated to reflect the number of buffers that were
+                        discarded since the last successful invocation of this method.
+     * @return true if there was data to populate the array and false otherwise. If false then
+     *         neither the metrics buffer or dropCount will be modified.
+     */
+    bool getNextBuffer(JNIEnv* env, jlongArray metrics, int* dropCount);
+
+    void notify(const int64_t* stats) override;
+
+private:
+    static constexpr int kBufferSize = static_cast<int>(uirenderer::FrameInfoIndex::NumIndexes);
+    static constexpr int kRingSize = 3;
+
+    class FrameMetricsNotification {
+    public:
+        FrameMetricsNotification() {}
+
+        std::atomic_bool hasData = false;
+        int64_t buffer[kBufferSize];
+        int dropCount = 0;
+    private:
+        // non-copyable
+        FrameMetricsNotification(const FrameMetricsNotification&) = delete;
+        FrameMetricsNotification& operator=(const FrameMetricsNotification& ) = delete;
+    };
+
+    JavaVM* const mVm;
+    jweak mObserverWeak;
+
+    int mNextFree = 0;
+    int mNextInQueue = 0;
+    FrameMetricsNotification mRingBuffer[kRingSize];
+
+    int mDroppedReports = 0;
+};
+
+} // namespace android