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
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
|
/* -*- 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 "gfxVars.h"
#include "gfxVarReceiver.h"
#include "mozilla/dom/ContentChild.h"
namespace mozilla {
namespace gfx {
StaticAutoPtr<gfxVars> gfxVars::sInstance;
StaticAutoPtr<nsTArray<gfxVars::VarBase*>> gfxVars::sVarList;
// Used only during initialization to store pending updates if received prior to
// gfxVars::Initialize.
StaticAutoPtr<nsTArray<GfxVarUpdate>> gGfxVarInitUpdates;
// Used only after initialization to store pending updates for
// gfxVarsCollectUpdates that will be dispatched once it goes out of scope. This
// is useful when we are changing multiple gfxVars and wish to only update the
// child processes once.
StaticAutoPtr<nsTArray<GfxVarUpdate>> gGfxVarPendingUpdates;
void gfxVars::SetValuesForInitialize(
const nsTArray<GfxVarUpdate>& aInitUpdates) {
// This should only be called once
MOZ_RELEASE_ASSERT(!gGfxVarInitUpdates);
// We expect aInitUpdates to be provided before any other gfxVars operation,
// and for sInstance to be null here, but handle the alternative.
if (sInstance) {
// Apply the updates, the object has been created already
ApplyUpdate(aInitUpdates);
} else {
// Save the values for Initialize call
gGfxVarInitUpdates = new nsTArray<GfxVarUpdate>(aInitUpdates.Clone());
}
}
void gfxVars::StartCollectingUpdates() {
MOZ_RELEASE_ASSERT(XRE_IsParentProcess());
MOZ_RELEASE_ASSERT(sInstance);
MOZ_RELEASE_ASSERT(!gGfxVarPendingUpdates);
gGfxVarPendingUpdates = new nsTArray<GfxVarUpdate>();
}
void gfxVars::StopCollectingUpdates() {
MOZ_RELEASE_ASSERT(XRE_IsParentProcess());
MOZ_RELEASE_ASSERT(sInstance);
MOZ_RELEASE_ASSERT(gGfxVarPendingUpdates);
if (!gGfxVarPendingUpdates->IsEmpty()) {
for (auto& receiver : sInstance->mReceivers) {
receiver->OnVarChanged(*gGfxVarPendingUpdates);
}
}
gGfxVarPendingUpdates = nullptr;
}
void gfxVars::Initialize() {
if (sInstance) {
MOZ_RELEASE_ASSERT(
!gGfxVarInitUpdates,
"Initial updates should not be present after any gfxVars operation");
return;
}
// sVarList must be initialized first since it's used in the constructor for
// sInstance.
sVarList = new nsTArray<gfxVars::VarBase*>();
sInstance = new gfxVars;
// Content processes should have gotten a call to SetValuesForInitialize,
// which will have set gGfxVarInitUpdates.
MOZ_ASSERT_IF(XRE_IsContentProcess(), gGfxVarInitUpdates);
if (gGfxVarInitUpdates) {
// Apply any updates from gGfxVarInitUpdates.
ApplyUpdate(*gGfxVarInitUpdates);
gGfxVarInitUpdates = nullptr;
}
}
gfxVars::gfxVars() = default;
void gfxVars::Shutdown() {
sInstance = nullptr;
sVarList = nullptr;
gGfxVarInitUpdates = nullptr;
}
/* static */
void gfxVars::ApplyUpdate(const nsTArray<GfxVarUpdate>& aUpdate) {
// Only subprocesses receive updates and apply them locally.
MOZ_ASSERT(!XRE_IsParentProcess());
MOZ_DIAGNOSTIC_ASSERT(sVarList || gGfxVarInitUpdates);
if (sVarList) {
for (auto& i : aUpdate) {
sVarList->ElementAt(i.index())->SetValue(i.value());
}
} else if (gGfxVarInitUpdates) {
// Too early, we haven't been initialized, so just add to
// the array waiting for the initialization...
gGfxVarInitUpdates->AppendElements(aUpdate);
}
}
/* static */
void gfxVars::AddReceiver(gfxVarReceiver* aReceiver) {
MOZ_ASSERT(NS_IsMainThread());
// Don't double-add receivers, in case a broken content process sends two
// init messages.
if (!sInstance->mReceivers.Contains(aReceiver)) {
sInstance->mReceivers.AppendElement(aReceiver);
}
}
/* static */
void gfxVars::RemoveReceiver(gfxVarReceiver* aReceiver) {
MOZ_ASSERT(NS_IsMainThread());
if (sInstance) {
sInstance->mReceivers.RemoveElement(aReceiver);
}
}
/* static */
nsTArray<GfxVarUpdate> gfxVars::FetchNonDefaultVars() {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(sVarList);
nsTArray<GfxVarUpdate> updates;
for (size_t i = 0; i < sVarList->Length(); i++) {
VarBase* var = sVarList->ElementAt(i);
if (var->HasDefaultValue()) {
continue;
}
GfxVarValue value;
var->GetValue(&value);
updates.AppendElement(GfxVarUpdate(i, value));
}
return updates;
}
gfxVars::VarBase::VarBase() {
mIndex = gfxVars::sVarList->Length();
gfxVars::sVarList->AppendElement(this);
}
void gfxVars::NotifyReceivers(VarBase* aVar) {
MOZ_ASSERT(NS_IsMainThread());
GfxVarValue value;
aVar->GetValue(&value);
if (XRE_IsParentProcess() && gGfxVarPendingUpdates) {
gGfxVarPendingUpdates->AppendElement(GfxVarUpdate(aVar->Index(), value));
return;
}
AutoTArray<GfxVarUpdate, 1> vars;
vars.AppendElement(GfxVarUpdate(aVar->Index(), value));
for (auto& receiver : mReceivers) {
receiver->OnVarChanged(vars);
}
}
} // namespace gfx
} // namespace mozilla
|
