Implemented Browser Plugin (NOT FOR REVIEW)

content/renderer/browser_plugin/browser_plugin.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.h"
+
+#include "base/atomic_sequence_num.h"
+#include "base/id_map.h"
+#include "base/lazy_instance.h"
+#include "base/process.h"
+#include "base/string_number_conversions.h"
+#include "base/string_piece.h"
+#include "base/string_util.h"
+#include "base/values.h"
+#include "content/common/browser_plugin_messages.h"
+#include "content/public/renderer/render_view.h"
+#include "content/renderer/render_view_impl.h"
+#include "ipc/ipc_channel_handle.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebPlugin.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebPluginContainer.h"
+#include "webkit/plugins/ppapi/ppapi_plugin_instance.h"
+#include "webkit/plugins/ppapi/ppapi_webplugin_impl.h"
+#include "webkit/plugins/webview_plugin.h"
+
+static base::StaticAtomicSequenceNumber g_next_id;
+
+// The global list of all Browser Plugin Placeholders within a process.
+base::LazyInstance<IDMap<BrowserPlugin> >::Leaky
+    g_all_browser_plugins = LAZY_INSTANCE_INITIALIZER;
+
+using webkit::WebViewPlugin;
+using WebKit::WebPlugin;
+using WebKit::WebPluginContainer;
+
+const char* const kPluginPlaceholderDataURL =
+    "about:blank";
+
+// static
+WebKit::WebPlugin* BrowserPlugin::Create(
+    RenderViewImpl* render_view,
+    WebKit::WebFrame* frame,
+    const WebKit::WebPluginParams& params) {
+  // TODO(fsamuel): Figure out what the lifetime is of this class.
+  // It seems we need to blow away this object once a WebPluginContainer is
+  // gone. How do we detect it's gone? A WebKit change perhaps?
+  BrowserPlugin* browser_plugin = new BrowserPlugin(
+      render_view, frame, params, "");
+  return browser_plugin->plugin_placeholder();
+}
+
+// static
+BrowserPlugin* BrowserPlugin::FromID(int id) {
+  return g_all_browser_plugins.Get().Lookup(id);
+}
+
+BrowserPlugin::BrowserPlugin(
+    RenderViewImpl* render_view,
+    WebKit::WebFrame* frame,
+    const WebKit::WebPluginParams& params,
+    const std::string& html_data)
+    : render_view_(render_view),
+      plugin_params_(params),
+      placeholder_(webkit::WebViewPlugin::Create(
+                   NULL, render_view->GetWebkitPreferences(), html_data,
+                   GURL(kPluginPlaceholderDataURL))),
+      plugin_(NULL) {
+  id_ = g_next_id.GetNext();
+  Register(GetID(), this);
+
+  // By default we navigate to google.com
+  GetPluginParameters(0, 0, "");
+
+  if (!src_.empty())
+    render_view->Send(new BrowserPluginHostMsg_NavigateFromEmbedder(
+        render_view->GetRoutingID(),
+        GetID(),
+        frame->identifier(),
+        src_,
+        size_));
+}
+
+BrowserPlugin::~BrowserPlugin() {
+  Unregister(GetID());
+}
+
+// static
+void BrowserPlugin::Register(int id, BrowserPlugin* browser_plugin) {
+  g_all_browser_plugins.Get().AddWithID(browser_plugin, id);
+}
+
+// static
+void BrowserPlugin::Unregister(int id) {
+  if (g_all_browser_plugins.Get().Lookup(id))
+    g_all_browser_plugins.Get().Remove(id);
+}
+
+const WebKit::WebPluginParams& BrowserPlugin::plugin_params() const {
+    return plugin_params_;
+}
+
+void BrowserPlugin::GetPluginParameters(
+    int default_width, int default_height,
+    const std::string& default_src) {
+  int width = default_width;
+  int height = default_height;
+
+  // Get the plugin parameters from the attributes vector
+  for (unsigned i = 0; i < plugin_params_.attributeNames.size(); ++i) {
+    std::string attributeName = plugin_params_.attributeNames[i].utf8();
+    if (LowerCaseEqualsASCII(attributeName, "width")) {
+      std::string attributeValue = plugin_params_.attributeValues[i].utf8();
+      CHECK(base::StringToInt(attributeValue, &width));
+    } else if (LowerCaseEqualsASCII(attributeName, "height")) {
+      std::string attributeValue = plugin_params_.attributeValues[i].utf8();
+      CHECK(base::StringToInt(attributeValue, &height));
+    } else if (LowerCaseEqualsASCII(attributeName, "src")) {
+      src_ = plugin_params_.attributeValues[i].utf8();
+    }
+  }
+  // If we didn't find the attributes set or they're not sensible,
+  // we reset our attributes to the default.
+  if (src_.empty())
+    src_ = default_src;
+
+  size_.SetSize(width, height);
+}
+
+void BrowserPlugin::LoadGuest(
+    int guest_process_id,
+    const IPC::ChannelHandle& channel_handle) {
+  webkit::ppapi::WebPluginImpl* new_guest =
+      render_view()->CreateBrowserPlugin(channel_handle,
+                                         guest_process_id,
+                                         plugin_params());
+  Replace(new_guest);
+}
+
+void BrowserPlugin::Replace(
+    webkit::ppapi::WebPluginImpl* new_plugin) {
+  WebKit::WebPlugin* current_plugin =
+      plugin_ ? static_cast<WebKit::WebPlugin*>(plugin_) : placeholder_;
+  WebKit::WebPluginContainer* container = current_plugin->container();
+  if (!new_plugin || !new_plugin->initialize(container))
+    return;
+
+  // Clear the container's backing texture ID.
+  if (plugin_)
+      plugin_->instance()->BindGraphics(plugin_->instance()->pp_instance(), 0);
+
+  // Inform the browser process of the association between the browser plugin's
+  // instance ID and the pepper channel's PP_Instance identifier.
+  render_view()->Send(new BrowserPluginHostMsg_MapInstance(
+      render_view()->GetRoutingID(),
+      GetID(),
+      new_plugin->instance()->pp_instance()));
+  // TODO(fsamuel): We should delay the swapping out of the current plugin
+  // until after the guest's WebGraphicsContext3D has been initialized. That
+  // way, we immediately have something to render onto the screen.
+  container->setPlugin(new_plugin);
+  container->invalidate();
+  container->reportGeometry();
+  if (plugin_)
+    plugin_->destroy();
+  plugin_ = new_plugin;
+}