1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_dom_LargestContentfulPaint_h___
#define mozilla_dom_LargestContentfulPaint_h___
#include "imgRequestProxy.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/PerformanceEntry.h"
#include "mozilla/dom/PerformanceLargestContentfulPaintBinding.h"
#include "nsCycleCollectionParticipant.h"
class nsTextFrame;
namespace mozilla::dom {
static constexpr nsLiteralString kLargestContentfulPaintName =
u"largest-contentful-paint"_ns;
class Performance;
class PerformanceMainThread;
struct LCPTextFrameHelper final {
static void MaybeUnionTextFrame(nsTextFrame* aTextFrame,
const nsRect& aRelativeToSelfRect);
};
class ImagePendingRendering final {
public:
ImagePendingRendering(Element* aElement, imgRequestProxy* aImgRequestProxy,
const TimeStamp& aLoadTime)
: mElement(do_GetWeakReference(aElement)),
mImageRequestProxy(aImgRequestProxy),
mLoadTime(aLoadTime) {}
Element* GetElement() const {
nsCOMPtr<Element> element = do_QueryReferent(mElement);
return element;
}
imgRequestProxy* GetImgRequestProxy() const {
return static_cast<imgRequestProxy*>(mImageRequestProxy.get());
}
nsWeakPtr mElement;
WeakPtr<PreloaderBase> mImageRequestProxy;
TimeStamp mLoadTime;
};
class LCPHelpers final {
public:
// Called when the size of the image is known.
static void FinalizeLCPEntryForImage(Element* aContainingBlock,
imgRequestProxy* aImgRequestProxy,
const nsRect& aTargetRectRelativeToSelf);
static void FinalizeLCPEntryForText(PerformanceMainThread* aPerformance,
const TimeStamp& aRenderTime,
Element* aContainingBlock,
const nsRect& aTargetRectRelativeToSelf,
const nsPresContext* aPresContext);
static bool IsQualifiedImageRequest(imgRequest* aRequest,
Element* aContainingElement);
private:
static bool CanFinalizeLCPEntry(const nsIFrame* aFrame);
};
// https://w3c.github.io/largest-contentful-paint/
class LargestContentfulPaint final : public PerformanceEntry {
public:
NS_DECL_ISUPPORTS_INHERITED
NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(LargestContentfulPaint,
PerformanceEntry)
LargestContentfulPaint(PerformanceMainThread* aPerformance,
const TimeStamp& aRenderTime,
const Maybe<TimeStamp>& aLoadTime,
const unsigned long aSize, nsIURI* aURI,
Element* aElement, bool aShouldExposeRenderTime);
JSObject* WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) override;
DOMHighResTimeStamp RenderTime() const;
DOMHighResTimeStamp LoadTime() const;
DOMHighResTimeStamp StartTime() const override;
DOMHighResTimeStamp PaintTime() const { return RenderTime(); }
Nullable<DOMHighResTimeStamp> GetPresentationTime() const { return nullptr; }
unsigned long Size() const { return mSize; }
void GetId(nsAString& aId) const {
if (mId) {
mId->ToString(aId);
}
}
void GetUrl(nsAString& aUrl);
Element* GetElement() const;
static Element* GetContainingBlockForTextFrame(const nsTextFrame* aTextFrame);
void UpdateSize(const Element* aContainingBlock,
const nsRect& aTargetRectRelativeToSelf,
const PerformanceMainThread* aPerformance, bool aIsImage);
void BufferEntryIfNeeded() override;
static void MaybeProcessImageForElementTiming(imgRequestProxy* aRequest,
Element* aElement);
void QueueEntry();
private:
~LargestContentfulPaint() = default;
void ReportLCPToNavigationTimings();
RefPtr<PerformanceMainThread> mPerformance;
// This is always set but only exposed to web content if
// mShouldExposeRenderTime is true.
const TimeStamp mRenderTime;
const Maybe<TimeStamp> mLoadTime;
// This is set to false when for security reasons web content it not allowed
// to see the RenderTime.
const bool mShouldExposeRenderTime;
unsigned long mSize;
nsCOMPtr<nsIURI> mURI;
nsWeakPtr mElement;
RefPtr<nsAtom> mId;
};
} // namespace mozilla::dom
#endif
|
