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// 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_OUTPUT_BEGIN_FRAME_ARGS_H_
#define CC_OUTPUT_BEGIN_FRAME_ARGS_H_
#include "base/location.h"
#include "base/memory/ref_counted.h"
#include "base/time/time.h"
#include "base/values.h"
#include "cc/base/cc_export.h"
namespace base {
namespace trace_event {
class ConvertableToTraceFormat;
class TracedValue;
}
}
/**
* In debug builds we trace the creation origin of BeginFrameArgs objects. We
* reuse the tracked_objects::Location system to do that.
*
* However, in release builds we don't want this as it doubles the size of the
* BeginFrameArgs object. As well it adds a number of largish strings to the
* binary. Despite the argument being unused, most compilers are unable to
* optimise it away even when unused. Instead we use the BEGINFRAME_FROM_HERE
* macro to prevent the data even getting referenced.
*/
#ifdef NDEBUG
#define BEGINFRAME_FROM_HERE nullptr
#else
#define BEGINFRAME_FROM_HERE FROM_HERE
#endif
namespace cc {
namespace proto {
class BeginFrameArgs;
}
struct CC_EXPORT BeginFrameArgs {
enum BeginFrameArgsType {
INVALID,
NORMAL,
MISSED,
// Not a real type, but used by the IPC system. Should always remain the
// *last* value in this enum.
BEGIN_FRAME_ARGS_TYPE_MAX,
};
static const char* TypeToString(BeginFrameArgsType type);
void BeginFrameArgsTypeToProtobuf(proto::BeginFrameArgs* proto) const;
void BeginFrameArgsTypeFromProtobuf(const proto::BeginFrameArgs& proto);
// Creates an invalid set of values.
BeginFrameArgs();
#ifdef NDEBUG
typedef const void* CreationLocation;
#else
typedef const tracked_objects::Location& CreationLocation;
tracked_objects::Location created_from;
#endif
// You should be able to find all instances where a BeginFrame has been
// created by searching for "BeginFrameArgs::Create".
// The location argument should **always** be BEGINFRAME_FROM_HERE macro.
static BeginFrameArgs Create(CreationLocation location,
base::TimeTicks frame_time,
base::TimeTicks deadline,
base::TimeDelta interval,
BeginFrameArgsType type);
// This is the default delta that will be used to adjust the deadline when
// proper draw-time estimations are not yet available.
static base::TimeDelta DefaultEstimatedParentDrawTime();
// This is the default interval to use to avoid sprinkling the code with
// magic numbers.
static base::TimeDelta DefaultInterval();
bool IsValid() const { return interval >= base::TimeDelta(); }
scoped_ptr<base::trace_event::ConvertableToTraceFormat> AsValue() const;
void AsValueInto(base::trace_event::TracedValue* dict) const;
void ToProtobuf(proto::BeginFrameArgs* proto) const;
void FromProtobuf(const proto::BeginFrameArgs& proto);
base::TimeTicks frame_time;
base::TimeTicks deadline;
base::TimeDelta interval;
BeginFrameArgsType type;
bool on_critical_path;
private:
BeginFrameArgs(base::TimeTicks frame_time,
base::TimeTicks deadline,
base::TimeDelta interval,
BeginFrameArgsType type);
};
} // namespace cc
#endif // CC_OUTPUT_BEGIN_FRAME_ARGS_H_
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