Part 2 of cc/ directory shuffles: debug

Continuation of https://src.chromium.org/viewvc/chrome?view=rev&revision=188681

BUG=190824
TBR=enne@chromium.org

Review URL: https://codereview.chromium.org/12648008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@188685 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 67 insertions, 0 deletions

diff --git a/cc/debug/paint_time_counter.h b/cc/debug/paint_time_counter.h
new file mode 100644
index 0000000..a195083
--- /dev/null
+++ b/cc/debug/paint_time_counter.h
@@ -0,0 +1,67 @@
+// Copyright 2013 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.
+
+#ifndef CC_DEBUG_PAINT_TIME_COUNTER_H_
+#define CC_DEBUG_PAINT_TIME_COUNTER_H_
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/time.h"
+#include "cc/debug/ring_buffer.h"
+
+namespace cc {
+
+// Maintains a history of paint times for each frame
+class PaintTimeCounter {
+ public:
+  static scoped_ptr<PaintTimeCounter> Create();
+
+  size_t HistorySize() const { return ring_buffer_.BufferSize(); }
+
+  struct Entry {
+    Entry()
+        : commit_number(0) {}
+
+    int commit_number;
+    base::TimeDelta paint_time;
+    base::TimeDelta rasterize_time;
+
+    base::TimeDelta total_time() const {
+      return paint_time + rasterize_time;
+    }
+  };
+
+  // n = 0 returns the oldest and
+  // n = PaintTimeHistorySize() - 1 the most recent paint time.
+  base::TimeDelta GetPaintTimeOfRecentFrame(const size_t& n) const;
+
+  void SavePaintTime(const base::TimeDelta& total_paint_time,
+                     int commit_number);
+  void SaveRasterizeTime(const base::TimeDelta& total_rasterize_time,
+                         int commit_number);
+  void GetMinAndMaxPaintTime(base::TimeDelta* min, base::TimeDelta* max) const;
+
+  void ClearHistory();
+
+  typedef RingBuffer<Entry, 200> RingBufferType;
+  RingBufferType::Iterator Begin() const { return ring_buffer_.Begin(); }
+  RingBufferType::Iterator End() const { return ring_buffer_.End(); }
+
+ private:
+  PaintTimeCounter();
+
+  RingBufferType ring_buffer_;
+
+  base::TimeDelta last_total_paint_time_;
+  base::TimeDelta last_total_rasterize_time_;
+
+  bool can_save_paint_time_delta_;
+  bool can_save_rasterize_time_delta_;
+
+  DISALLOW_COPY_AND_ASSIGN(PaintTimeCounter);
+};
+
+}  // namespace cc
+
+#endif  // CC_DEBUG_PAINT_TIME_COUNTER_H_