1 files changed, 70 insertions, 0 deletions
diff --git a/libhistogram/histogram_collector.h b/libhistogram/histogram_collector.h
new file mode 100644
index 00000000..d2527ddb
--- /dev/null
+++ b/libhistogram/histogram_collector.h
@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2018 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 HISTOGRAM_HISTOGRAM_COLLECTOR_H_
+#define HISTOGRAM_HISTOGRAM_COLLECTOR_H_
+#include <string>
+#include <thread>
+#define HWC2_INCLUDE_STRINGIFICATION
+#define HWC2_USE_CPP11
+#include <hardware/hwcomposer2.h>
+#undef HWC2_INCLUDE_STRINGIFICATION
+#undef HWC2_USE_CPP11
+
+//number of enums in hwc2_format_color_component_t;
+#define NUM_HISTOGRAM_COLOR_COMPONENTS 4
+
+namespace histogram {
+
+class Ringbuffer;
+class HistogramCollector
+{
+public:
+    HistogramCollector();
+    ~HistogramCollector();
+
+    void start();
+    void start(uint64_t max_frames);
+    void stop();
+
+    std::string Dump() const;
+
+    HWC2::Error collect(uint64_t max_frames,
+                        uint64_t timestamp,
+                        int32_t samples_size[NUM_HISTOGRAM_COLOR_COMPONENTS],
+                        uint64_t* samples[NUM_HISTOGRAM_COLOR_COMPONENTS],
+                        uint64_t* numFrames) const;
+    HWC2::Error getAttributes(int32_t* format,
+                              int32_t* dataspace,
+                              uint8_t* supported_components) const;
+
+private:
+    HistogramCollector(HistogramCollector const&) = delete;
+    HistogramCollector& operator=(HistogramCollector const&) = delete;
+    void collecting_thread(int pipe);
+
+    std::mutex thread_control;
+    bool started = false;
+    std::thread monitoring_thread;
+    int selfpipe[2];
+
+    std::unique_ptr<histogram::Ringbuffer> histogram;
+
+};
+
+}  // namespace histogram
+
+#endif  // HISTOGRAM_HISTOGRAM_COLLECTOR_H_