Texture provider to feed data to the impl side thread for webview compositing.

content/renderer/browser_plugin/browser_plugin_texture_provider.cc

+// Copyright (c) 2012 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_texture_provider.h"
+
+#include "base/message_loop.h"
+#include "content/common/browser_plugin_messages.h"
+#include "content/renderer/browser_plugin/browser_plugin_compositing_filter.h"
+#include "content/renderer/browser_plugin/browser_plugin_manager.h"
+#include "content/renderer/browser_plugin/browser_plugin_manager_impl.h"
+#include "content/renderer/render_view_impl.h"
+#include "content/renderer/render_thread_impl.h"
+#include "content/renderer/gpu/compositor_thread.h"
+
+#include "ui/gfx/size.h"
+
+using WebKit::WebFloatRect;
+
+namespace content {
+
+// Called on main therad
+BrowserPluginTextureProvider::BrowserPluginTextureProvider(
+    int instance_id,
+    int host_routing_id,
+    IPC::ChannelProxy* channel_proxy,
+    scoped_refptr<base::MessageLoopProxy> message_loop)
+  : client_(0),
+    filter_(0),
+    instance_id_(instance_id),
+    impl_loop_(message_loop),
+    channel_proxy_(channel_proxy),
+    host_routing_id_(host_routing_id),
+    texture_size_(0, 0),
+    pending_swap_buffers_(false),
+    pending_swap_buffers_surface_handle_(0),
+    pending_swap_buffers_route_id_(0),
+    pending_swap_buffers_gpu_host_id_(0) {
+}
+
+void BrowserPluginTextureProvider::Initialize() {
+  SetUpFilter();
+}
+
+BrowserPluginTextureProvider::~BrowserPluginTextureProvider() {
+}
+
+// Called on the main thread; ends the lifetime on this thread
+void BrowserPluginTextureProvider::Destroy() {
+  impl_loop_->PostTask(FROM_HERE, base::Bind(
+      &BrowserPluginTextureProvider::DestroyImpl,
+      base::Unretained(this)));
+}
+
+// Called on impl thread
+void BrowserPluginTextureProvider::DestroyImpl() {
+  DCHECK(IsOnCorrectThread());
+  RemoveFilter();
+  if (client_)
+    client_->stopUsingProvider();
+
+  delete this;
+}
+
+// Called on impl thread (we store our impl thread loop here)
+void BrowserPluginTextureProvider::setTextureProviderClient(Client* client) {
+  DCHECK(IsOnCorrectThread());
+  client_ = client;
+  if (pending_swap_buffers_) {
+    OnBuffersSwapped(instance_id_,
+                     pending_swap_buffers_surface_handle_,
+                     pending_swap_buffers_route_id_,
+                     pending_swap_buffers_gpu_host_id_);
+    pending_swap_buffers_ = false;
+  }
+}
+
+// Called on impl thread
+void BrowserPluginTextureProvider::OnMessageReceived(
+    const IPC::Message& message) {
+  IPC_BEGIN_MESSAGE_MAP(BrowserPluginTextureProvider, message)
+    IPC_MESSAGE_HANDLER(BrowserPluginMsg_BuffersSwapped, OnBuffersSwapped)
+    IPC_MESSAGE_HANDLER(BrowserPluginMsg_SurfaceResize, OnSurfaceResize)
+  IPC_END_MESSAGE_MAP()
+}
+
+// Called on impl thread
+void BrowserPluginTextureProvider::OnBuffersSwapped(int instance_id,
+                                                    uint64 surface_handle,
+                                                    int route_id,
+                                                    int gpu_host_id) {
+  DCHECK(surface_handle != 0);
+  DCHECK(instance_id == instance_id_);
+  DCHECK(IsOnCorrectThread());
+
+  if (!client_) {
+      pending_swap_buffers_ = true;
+      pending_swap_buffers_surface_handle_ = surface_handle;
+      pending_swap_buffers_route_id_ = route_id;
+      pending_swap_buffers_gpu_host_id_ = gpu_host_id;
+      return;
+  }
+
+  client_->didReceiveFrame(surface_handle);
+  Send(new BrowserPluginHostMsg_BuffersSwappedACK(
+      host_routing_id_,
+      route_id,
+      gpu_host_id,
+      client_->insertSyncPoint()));
+}
+
+// Called on impl thread
+void BrowserPluginTextureProvider::OnSurfaceResize(
+    int instance_id,
+    const gfx::Size& size) {
+  DCHECK(instance_id == instance_id_);
+  DCHECK(IsOnCorrectThread());
+  // TODO: figure out what resizing behaviour is needed here.
+  texture_size_ = size;
+  if (client_)
+    client_->didUpdateTextureParams(true, true, WebFloatRect(0, 0, 1, 1));
+}
+
+// Called on any thread
+bool BrowserPluginTextureProvider::Send(IPC::Message* message) {
+  DCHECK(channel_proxy_);
+  return channel_proxy_->Send(message);
+}
+
+// Called on impl thread to create a new filter and attach it to the
+// ChannelProxy
+void BrowserPluginTextureProvider::SetUpFilter() {
+  DCHECK(channel_proxy_);
+
+  filter_ = new BrowserPluginCompositingFilter(
+      impl_loop_,
+      instance_id_,
+      base::Bind(
+          &BrowserPluginTextureProvider::OnMessageReceived,
+          base::Unretained(this)));
+
+  channel_proxy_->AddFilter(filter_);
+}
+
+void BrowserPluginTextureProvider::RemoveFilter() {
+  if (filter_) {
+    channel_proxy_->RemoveFilter(filter_);
+  }
+}
+
+bool BrowserPluginTextureProvider::IsOnCorrectThread() {
+  return impl_loop_ == base::MessageLoopProxy::current();
+}
+
+}  // namespace content