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
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
|
// Copyright (c) 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.
#include "content/renderer/browser_plugin/browser_plugin_compositing_helper.h"
#include "cc/solid_color_layer.h"
#include "cc/texture_layer.h"
#include "content/common/browser_plugin_messages.h"
#include "content/renderer/browser_plugin/browser_plugin_manager.h"
#include "content/renderer/render_thread_impl.h"
#include "third_party/khronos/GLES2/gl2.h"
#include "third_party/WebKit/Source/Platform/chromium/public/WebGraphicsContext3D.h"
#include "third_party/WebKit/Source/Platform/chromium/public/WebSharedGraphicsContext3D.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebPluginContainer.h"
#include "webkit/compositor_bindings/web_layer_impl.h"
namespace content {
BrowserPluginCompositingHelper::BrowserPluginCompositingHelper(
WebKit::WebPluginContainer* container,
BrowserPluginManager* manager,
int instance_id,
int host_routing_id)
: instance_id_(instance_id),
host_routing_id_(host_routing_id),
last_gpu_route_id_(0),
last_gpu_host_id_(0),
last_mailbox_valid_(false),
ack_pending_(true),
ack_pending_for_crashed_guest_(false),
container_(container),
browser_plugin_manager_(manager) {
}
BrowserPluginCompositingHelper::~BrowserPluginCompositingHelper() {
}
void BrowserPluginCompositingHelper::EnableCompositing(bool enable) {
if (enable && !texture_layer_) {
texture_layer_ = cc::TextureLayer::createForMailbox();
texture_layer_->setIsDrawable(true);
texture_layer_->setContentsOpaque(true);
background_layer_ = cc::SolidColorLayer::create();
background_layer_->setMasksToBounds(true);
background_layer_->setBackgroundColor(
SkColorSetARGBInline(255, 255, 255, 255));
background_layer_->addChild(texture_layer_);
web_layer_.reset(new WebKit::WebLayerImpl(background_layer_));
}
container_->setWebLayer(enable ? web_layer_.get() : NULL);
}
// If we have a mailbox that was freed up from the compositor,
// but we are not expected to return it to the guest renderer
// via an ACK, we should free it because we now own it.
// To free the mailbox memory, we need a context to consume it
// into a texture ID and then delete this texture ID.
// We use a shared graphics context accessible from the main
// thread to do it.
void BrowserPluginCompositingHelper::FreeMailboxMemory(
const std::string& mailbox_name,
unsigned sync_point) {
if (mailbox_name.empty())
return;
WebKit::WebGraphicsContext3D *context =
WebKit::WebSharedGraphicsContext3D::mainThreadContext();
DCHECK(context);
// When a buffer is released from the compositor, we also get a
// sync point that specifies when in the command buffer
// it's safe to use it again.
// If the sync point is non-zero, we need to tell our context
// to wait until this sync point is reached before we can safely
// delete the buffer.
if (sync_point)
context->waitSyncPoint(sync_point);
unsigned texture_id = context->createTexture();
context->bindTexture(GL_TEXTURE_2D, texture_id);
context->consumeTextureCHROMIUM(
GL_TEXTURE_2D,
reinterpret_cast<const int8*>(mailbox_name.data()));
context->deleteTexture(texture_id);
}
void BrowserPluginCompositingHelper::MailboxReleased(
const std::string& mailbox_name,
int gpu_route_id,
int gpu_host_id,
unsigned sync_point) {
// This means the GPU process crashed and we have nothing further to do.
// Nobody is expecting an ACK and the buffer doesn't need to be deleted
// because it went away with the GPU process.
if (last_gpu_host_id_ != gpu_host_id)
return;
// This means the guest crashed.
// Either ACK the last buffer, so texture transport could
// be destroyed of delete the mailbox if nobody wants it back.
if (last_gpu_route_id_ != gpu_route_id) {
if (!ack_pending_for_crashed_guest_) {
FreeMailboxMemory(mailbox_name, sync_point);
} else {
ack_pending_for_crashed_guest_ = false;
browser_plugin_manager_->Send(
new BrowserPluginHostMsg_BuffersSwappedACK(
host_routing_id_,
instance_id_,
gpu_route_id,
gpu_host_id,
mailbox_name,
sync_point));
}
return;
}
// We need to send an ACK to TextureImageTransportSurface
// for every buffer it sends us. However, if a buffer is freed up from
// the compositor in cases like switching back to SW mode without a new
// buffer arriving, no ACK is needed and we destroy this buffer.
if (!ack_pending_) {
FreeMailboxMemory(mailbox_name, sync_point);
last_mailbox_valid_ = false;
return;
}
ack_pending_ = false;
browser_plugin_manager_->Send(
new BrowserPluginHostMsg_BuffersSwappedACK(
host_routing_id_,
instance_id_,
gpu_route_id,
gpu_host_id,
mailbox_name,
sync_point));
}
void BrowserPluginCompositingHelper::OnContainerDestroy() {
if (container_)
container_->setWebLayer(NULL);
container_ = NULL;
texture_layer_ = NULL;
background_layer_ = NULL;
web_layer_.reset();
}
void BrowserPluginCompositingHelper::OnBuffersSwapped(
const gfx::Size& size,
const std::string& mailbox_name,
int gpu_route_id,
int gpu_host_id) {
// If the guest crashed but the GPU process didn't, we may still have
// a transport surface waiting on an ACK, which we must send to
// avoid leaking.
if (last_gpu_route_id_ != gpu_route_id && last_gpu_host_id_ == gpu_host_id)
ack_pending_for_crashed_guest_ = ack_pending_;
// If these mismatch, we are either just starting up, GPU process crashed or
// guest renderer crashed.
// In this case, we are communicating with a new image transport
// surface and must ACK with the new ID's and an empty mailbox.
if (last_gpu_route_id_ != gpu_route_id || last_gpu_host_id_ != gpu_host_id)
last_mailbox_valid_ = false;
last_gpu_route_id_ = gpu_route_id;
last_gpu_host_id_ = gpu_host_id;
ack_pending_ = true;
// Browser plugin getting destroyed, do a fast ACK.
if (!texture_layer_) {
MailboxReleased(mailbox_name, gpu_route_id, gpu_host_id, 0);
return;
}
// The size of browser plugin container is not always equal to the size
// of the buffer that arrives here. This could be for a number of reasons,
// including autosize and a resize in progress.
// During resize, the container size changes first and then some time
// later, a new buffer with updated size will arrive. During this process,
// we need to make sure that things are still displayed pixel perfect.
// We accomplish this by modifying bounds of the texture layer only
// when a new buffer arrives.
// Visually, this will either display a smaller part of the buffer
// or introduce a gutter around it.
if (buffer_size_ != size) {
buffer_size_ = size;
texture_layer_->setBounds(buffer_size_);
}
bool current_mailbox_valid = !mailbox_name.empty();
if (!last_mailbox_valid_) {
MailboxReleased(std::string(), gpu_route_id, gpu_host_id, 0);
if (!current_mailbox_valid)
return;
}
cc::TextureMailbox::ReleaseCallback callback;
if (current_mailbox_valid) {
callback = base::Bind(&BrowserPluginCompositingHelper::MailboxReleased,
scoped_refptr<BrowserPluginCompositingHelper>(this),
mailbox_name,
gpu_route_id,
gpu_host_id);
}
texture_layer_->setTextureMailbox(cc::TextureMailbox(mailbox_name,
callback));
last_mailbox_valid_ = current_mailbox_valid;
}
void BrowserPluginCompositingHelper::UpdateVisibility(bool visible) {
if (texture_layer_)
texture_layer_->setIsDrawable(visible);
}
} // namespace content
|
