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
140
141
142
143
144
145
|
/* -*- 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/. */
#include "FrameUniformityData.h"
#include <map>
#include "Units.h"
#include "gfxPoint.h"
#include "mozilla/TimeStamp.h"
#include "mozilla/dom/APZTestDataBinding.h"
#include "mozilla/dom/ToJSValue.h"
#include "nsTArray.h"
namespace mozilla {
namespace layers {
using namespace gfx;
Point LayerTransforms::GetAverage() {
MOZ_ASSERT(!mTransforms.IsEmpty());
Point current = mTransforms[0];
Point average;
size_t length = mTransforms.Length();
for (size_t i = 1; i < length; i++) {
Point nextTransform = mTransforms[i];
Point movement = nextTransform - current;
average += Point(std::fabs(movement.x), std::fabs(movement.y));
current = nextTransform;
}
average = average / (float)length;
return average;
}
Point LayerTransforms::GetStdDev() {
Point average = GetAverage();
Point stdDev;
Point current = mTransforms[0];
for (size_t i = 1; i < mTransforms.Length(); i++) {
Point next = mTransforms[i];
Point move = next - current;
move.x = fabs(move.x);
move.y = fabs(move.y);
Point diff = move - average;
diff.x = diff.x * diff.x;
diff.y = diff.y * diff.y;
stdDev += diff;
current = next;
}
stdDev = stdDev / mTransforms.Length();
stdDev.x = sqrt(stdDev.x);
stdDev.y = sqrt(stdDev.y);
return stdDev;
}
bool LayerTransforms::Sanitize() {
// Remove leading and trailing zeros to isolate the composites that actually
// changed the transform
for (size_t i = 1; i < mTransforms.Length(); i++) {
if (mTransforms[i] != mTransforms[i - 1]) {
mTransforms.RemoveElementsAt(0, i - 1);
break;
}
}
for (size_t i = mTransforms.Length() - 1; i > 0; i--) {
if (mTransforms[i - 1] != mTransforms[i]) {
mTransforms.SetLength(i + 1);
break;
}
}
return !mTransforms.IsEmpty();
}
LayerTransformRecorder::~LayerTransformRecorder() { Reset(); }
void LayerTransformRecorder::RecordTransform(Layer* aLayer,
const Point& aTransform) {
LayerTransforms* layerTransforms = GetLayerTransforms((uintptr_t)aLayer);
layerTransforms->mTransforms.AppendElement(aTransform);
}
void LayerTransformRecorder::EndTest(FrameUniformityData* aOutData) {
for (const auto& [layer, transforms] : mFrameTransforms) {
(void)transforms; // suppress unused variable warning
float uniformity = CalculateFrameUniformity(layer);
std::pair<uintptr_t, float> result(layer, uniformity);
aOutData->mUniformities.insert(result);
}
Reset();
}
LayerTransforms* LayerTransformRecorder::GetLayerTransforms(uintptr_t aLayer) {
auto [iter, inserted] =
mFrameTransforms.insert(FrameTransformMap::value_type{aLayer, nullptr});
if (inserted) {
iter->second = MakeUnique<LayerTransforms>();
}
return iter->second.get();
}
void LayerTransformRecorder::Reset() { mFrameTransforms.clear(); }
float LayerTransformRecorder::CalculateFrameUniformity(uintptr_t aLayer) {
LayerTransforms* layerTransform = GetLayerTransforms(aLayer);
float yUniformity = -1;
if (layerTransform->Sanitize()) {
Point stdDev = layerTransform->GetStdDev();
yUniformity = stdDev.y;
}
return yUniformity;
}
bool FrameUniformityData::ToJS(JS::MutableHandleValue aOutValue,
JSContext* aContext) {
dom::FrameUniformityResults results;
dom::Sequence<dom::FrameUniformity>& layers =
results.mLayerUniformities.Construct();
for (const auto& [layerAddr, uniformity] : mUniformities) {
// FIXME: Make this infallible after bug 968520 is done.
MOZ_ALWAYS_TRUE(layers.AppendElement(fallible));
dom::FrameUniformity& entry = layers.LastElement();
entry.mLayerAddress.Construct() = layerAddr;
entry.mFrameUniformity.Construct() = uniformity;
}
return dom::ToJSValue(aContext, results, aOutValue);
}
} // namespace layers
} // namespace mozilla
|
