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// Copyright 2016 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 THIRD_PARTY_BLINK_RENDERER_CORE_PAINT_FIRST_MEANINGFUL_PAINT_DETECTOR_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_PAINT_FIRST_MEANINGFUL_PAINT_DETECTOR_H_
#include "base/macros.h"
#include "third_party/blink/public/web/web_swap_result.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/paint/paint_event.h"
#include "third_party/blink/renderer/platform/heap/handle.h"
namespace base {
class TickClock;
}
namespace blink {
class Document;
class LayoutObjectCounter;
class PaintTiming;
// FirstMeaningfulPaintDetector observes layout operations during page load
// until network stable (no more than 2 network connections active in 0.5
// seconds), and computes the layout-based First Meaningful Paint.
// See https://goo.gl/vpaxv6 and http://goo.gl/TEiMi4 for more details.
class CORE_EXPORT FirstMeaningfulPaintDetector
: public GarbageCollected<FirstMeaningfulPaintDetector> {
public:
static FirstMeaningfulPaintDetector& From(Document&);
explicit FirstMeaningfulPaintDetector(PaintTiming*);
virtual ~FirstMeaningfulPaintDetector() = default;
void MarkNextPaintAsMeaningfulIfNeeded(const LayoutObjectCounter&,
double contents_height_before_layout,
double contents_height_after_layout,
int visible_height);
void NotifyInputEvent();
void NotifyPaint();
void ReportSwapTime(PaintEvent, WebSwapResult, base::TimeTicks);
void NotifyFirstContentfulPaint(base::TimeTicks swap_stamp);
void OnNetwork2Quiet();
// The caller owns the |clock| which must outlive the paint detector.
static void SetTickClockForTesting(const base::TickClock* clock);
void Trace(Visitor*);
enum HadUserInput { kNoUserInput, kHadUserInput, kHadUserInputEnumMax };
private:
friend class FirstMeaningfulPaintDetectorTest;
enum DeferFirstMeaningfulPaint {
kDoNotDefer,
kDeferOutstandingSwapPromises,
kDeferFirstContentfulPaintNotSet
};
Document* GetDocument();
int ActiveConnections();
void RegisterNotifySwapTime(PaintEvent);
void SetFirstMeaningfulPaint(base::TimeTicks swap_stamp);
bool next_paint_is_meaningful_ = false;
HadUserInput had_user_input_ = kNoUserInput;
HadUserInput had_user_input_before_provisional_first_meaningful_paint_ =
kNoUserInput;
Member<PaintTiming> paint_timing_;
base::TimeTicks provisional_first_meaningful_paint_;
base::TimeTicks provisional_first_meaningful_paint_swap_;
double max_significance_so_far_ = 0.0;
double accumulated_significance_while_having_blank_text_ = 0.0;
unsigned prev_layout_object_count_ = 0;
bool seen_first_meaningful_paint_candidate_ = false;
bool network_quiet_reached_ = false;
base::TimeTicks first_meaningful_paint_;
unsigned outstanding_swap_promise_count_ = 0;
DeferFirstMeaningfulPaint defer_first_meaningful_paint_ = kDoNotDefer;
DISALLOW_COPY_AND_ASSIGN(FirstMeaningfulPaintDetector);
};
} // namespace blink
#endif
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