Browser Plugin: New Implementation (Browser Side)

content/browser/browser_plugin/browser_plugin_guest.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/browser/browser_plugin/browser_plugin_guest.h"
+
+#include <algorithm>
+
+#include "base/time.h"
+#include "content/browser/browser_plugin/browser_plugin_guest_helper.h"
+#include "content/browser/browser_plugin/browser_plugin_host_factory.h"
+#include "content/browser/renderer_host/render_view_host_impl.h"
+#include "content/browser/renderer_host/render_widget_host_impl.h"
+#include "content/browser/web_contents/web_contents_impl.h"
+#include "content/common/browser_plugin_messages.h"
+#include "content/common/view_messages.h"
+#include "content/public/browser/render_process_host.h"
+#include "content/public/browser/render_view_host.h"
+#include "content/public/browser/render_widget_host_view.h"
+#include "content/public/browser/web_contents_observer.h"
+#include "content/public/common/result_codes.h"
+#include "ui/gfx/size.h"
+
+namespace content {
+
+// static
+BrowserPluginHostFactory* BrowserPluginGuest::factory_ = NULL;
+
+namespace {
+const int kGuestHangTimeout = 5000;
+}
+
+BrowserPluginGuest::BrowserPluginGuest(int instance_id,
+                                       WebContentsImpl* web_contents,
+                                       RenderViewHost* render_view_host)
+    : WebContentsObserver(web_contents),
+      embedder_render_process_host_(NULL),
+      instance_id_(instance_id),
+      pending_update_counter_(0) {
+  // |render_view_host| manages the ownership of this BrowserPluginGuestHelper.
+  new BrowserPluginGuestHelper(this, render_view_host);
+}
+
+BrowserPluginGuest::~BrowserPluginGuest() {
+}
+
+// static
+BrowserPluginGuest* BrowserPluginGuest::Create(
+    int instance_id,
+    WebContentsImpl* web_contents,
+    content::RenderViewHost* render_view_host) {
+  if (factory_) {
+    return factory_->CreateBrowserPluginGuest(instance_id,
+                                              web_contents,
+                                              render_view_host);
+  }
+  return new BrowserPluginGuest(instance_id, web_contents, render_view_host);
+}
+
+bool BrowserPluginGuest::ViewTakeFocus(bool reverse) {
+  SendMessageToEmbedder(
+      new BrowserPluginMsg_AdvanceFocus(instance_id(), reverse));
+  return true;
+}
+
+void BrowserPluginGuest::RendererUnresponsive(WebContents* source) {
+  base::ProcessHandle process_handle =
+      web_contents()->GetRenderProcessHost()->GetHandle();
+  base::KillProcess(process_handle, RESULT_CODE_HUNG, false);
+}
+
+void BrowserPluginGuest::SetDamageBuffer(
+    TransportDIB* damage_buffer, const gfx::Size& size, float scale_factor) {
+  damage_buffer_.reset(damage_buffer);
+  damage_buffer_size_ = size;
+  damage_buffer_scale_factor_ = scale_factor;
+}
+
+void BrowserPluginGuest::UpdateRect(
+    RenderViewHost* render_view_host,
+    const ViewHostMsg_UpdateRect_Params& params) {
+  // This handler is only of interest to us for the 2D software rendering path.
+  // needs_ack should always be true for the 2D path.
+  // TODO(fsamuel): Do we need to do something different in the 3D case?
+  if (!params.needs_ack)
+    return;
+
+  // Only copy damage if the guest's view size is equal to the damage buffer's
+  // size and the guest's scale factor is equal to the damage buffer's scale
+  // factor.

[awong, 2012/09/06 19:55:26]

If the scale factor is unequal (I presume this can happen if the guest navigates
to a domain that has a different host zoom setting?) won't this leave the guest
with a stale image?

Should be a bug?

[Fady Samuel, 2012/09/06 20:56:10]

Scaling has nothing to do with zooming.

Scaling is used on high-DPI screens (like retina display MacBook Pros).

Scaling can change if we move a window from a high-DPI screen to a low-DPI
screen or vice versa.

[awong, 2012/09/07 20:51:03]

Ah. So should this really be a DCHECK?

I'm trying to understand what then this clause is skipped and what the
consequences of that are.

[lazyboy, 2012/09/08 02:12:22]

Fady to comment on this one.

On 2012/09/07 20:51:03, awong wrote:

[Fady Samuel, 2012/09/10 16:24:11]

No, this shouldn't be a DCHECK. When we change the DPI on ChromeOS, the UI's DPI
changes, and it tells the WebContents to change its DPI. This is an async
process, and for a small period of time (milliseconds) the guest's WebContents
may be renderered at a different DPI than the embedder's.

[awong, 2012/09/10 19:21:07]

Ah hah! That's the piece I was missing.  Can we add a line saying that this can
happen due to asynchronous updates of the DPI on a resolution change?

[lazyboy, 2012/09/10 23:40:56]

Added the line.
Done.

+  if (params.view_size.width() == damage_buffer_size().width() &&
+      params.view_size.height() == damage_buffer_size().height() &&
+      params.scale_factor == damage_buffer_scale_factor()) {
+    TransportDIB* dib = render_view_host->GetProcess()->
+        GetTransportDIB(params.bitmap);
+    if (dib) {
+      void* guest_memory = dib->memory();
+      void* embedder_memory = damage_buffer_->memory();
+      size_t size = std::min(dib->size(), damage_buffer_->size());
+      memcpy(embedder_memory, guest_memory, size);
+    }
+  }
+  DCHECK(embedder_render_process_host());
+  BrowserPluginMsg_UpdateRect_Params relay_params;
+  relay_params.bitmap_rect = params.bitmap_rect;
+  relay_params.dx = params.dx;
+  relay_params.dy = params.dy;
+  relay_params.scroll_rect = params.scroll_rect;
+  relay_params.copy_rects = params.copy_rects;
+  relay_params.view_size = params.view_size;
+  relay_params.scale_factor = params.scale_factor;
+  relay_params.is_resize_ack = ViewHostMsg_UpdateRect_Flags::is_resize_ack(
+      params.flags);
+
+  // We need to send the ACK to the same render_view_host that issued
+  // the UpdateRect. We keep track of this correspondence via a message_id.
+  int message_id = pending_update_counter_++;
+  pending_updates_.AddWithID(render_view_host, message_id);
+
+  gfx::Size param_size = gfx::Size(params.view_size.width(),
+                                   params.view_size.height());
+
+  SendMessageToEmbedder(new BrowserPluginMsg_UpdateRect(instance_id(),
+                                                        message_id,
+                                                        relay_params));
+}
+
+void BrowserPluginGuest::UpdateRectACK(int message_id, const gfx::Size& size) {
+  RenderViewHost* render_view_host = pending_updates_.Lookup(message_id);
+  // If the guest has crashed since it sent the initial ViewHostMsg_UpdateRect
+  // then the pending_updates_ map will have been cleared.
+  if (!render_view_host)
+    return;
+  pending_updates_.Remove(message_id);
+  render_view_host->Send(
+      new ViewMsg_UpdateRect_ACK(render_view_host->GetRoutingID()));
+  if (!size.IsEmpty())
+    render_view_host->GetView()->SetSize(size);
+}
+
+void BrowserPluginGuest::HandleInputEvent(RenderViewHost* render_view_host,
+                                          const gfx::Rect& guest_rect,
+                                          const WebKit::WebInputEvent& event,
+                                          IPC::Message* reply_message) {
+  guest_rect_ = guest_rect;
+  RenderViewHostImpl* guest_rvh = static_cast<RenderViewHostImpl*>(
+      web_contents()->GetRenderViewHost());
+  IPC::Message* message = new ViewMsg_HandleInputEvent(
+      guest_rvh->GetRoutingID());
+
+  // Copy the WebInputEvent and modify the event type. The guest expects
+  // WebInputEvent::RawKeyDowns and not KeyDowns.
+  scoped_array<char> input_buffer(new char[event.size]);
+  memcpy(input_buffer.get(), &event, event.size);
+  WebKit::WebInputEvent* input_event =
+      reinterpret_cast<WebKit::WebInputEvent*>(input_buffer.get());
+  if (event.type == WebKit::WebInputEvent::KeyDown)
+    input_event->type = WebKit::WebInputEvent::RawKeyDown;
+
+  message->WriteData(input_buffer.get(), event.size);
+  // TODO(fsamuel): What do we need to do here? This is for keyboard shortcuts.
+  if (input_event->type == WebKit::WebInputEvent::RawKeyDown)
+    message->WriteBool(false);
+  guest_rvh->Send(message);
+
+  DCHECK(!pending_input_event_reply_.get());
+  pending_input_event_reply_.reset(reply_message);
+  guest_rvh->StartHangMonitorTimeout(
+      base::TimeDelta::FromMilliseconds(kGuestHangTimeout));
+}
+
+void BrowserPluginGuest::HandleInputEventAck(RenderViewHost* render_view_host,
+                                             bool handled) {
+  DCHECK(pending_input_event_reply_.get());
+  IPC::Message* reply_message = pending_input_event_reply_.release();
+  BrowserPluginHostMsg_HandleInputEvent::WriteReplyParams(reply_message,
+                                                          handled,
+                                                          cursor_);
+  SendMessageToEmbedder(reply_message);
+  RenderViewHostImpl* guest_rvh =
+      static_cast<RenderViewHostImpl*>(render_view_host);
+  guest_rvh->StopHangMonitorTimeout();
+}
+
+void BrowserPluginGuest::SetFocus(bool focused) {
+  RenderViewHost* render_view_host = web_contents()->GetRenderViewHost();
+  render_view_host->Send(
+      new ViewMsg_SetFocus(render_view_host->GetRoutingID(), focused));
+}
+
+void BrowserPluginGuest::ShowWidget(RenderViewHost* render_view_host,
+                                    int route_id,
+                                    const gfx::Rect& initial_pos) {
+  gfx::Rect screen_pos(initial_pos);
+  screen_pos.Offset(guest_rect_.origin());
+  static_cast<WebContentsImpl*>(web_contents())->ShowCreatedWidget(route_id,
+                                                                   screen_pos);
+}
+
+void BrowserPluginGuest::SetCursor(const WebCursor& cursor) {
+  cursor_ = cursor;
+}
+
+void BrowserPluginGuest::Destroy() {
+  WebContents* guest_web_contents = web_contents();
+  DCHECK(guest_web_contents);
+  delete guest_web_contents;
+}
+
+void BrowserPluginGuest::DidCommitProvisionalLoadForFrame(
+    int64 frame_id,
+    bool is_main_frame,
+    const GURL& url,
+    PageTransition transition_type,
+    RenderViewHost* render_view_host) {
+  // Inform its embedder of the updated URL.
+  DCHECK(embedder_render_process_host());
+  if (is_main_frame)
+    SendMessageToEmbedder(new BrowserPluginMsg_DidNavigate(instance_id(), url));
+}
+
+void BrowserPluginGuest::RenderViewGone(base::TerminationStatus status) {
+  DCHECK(embedder_render_process_host());
+  if (pending_input_event_reply_.get()) {
+    IPC::Message* reply_message = pending_input_event_reply_.release();
+    BrowserPluginHostMsg_HandleInputEvent::WriteReplyParams(reply_message,
+                                                            false,
+                                                            cursor_);
+    SendMessageToEmbedder(reply_message);
+  }
+  SendMessageToEmbedder(new BrowserPluginMsg_GuestCrashed(instance_id()));
+  IDMap<RenderViewHost>::const_iterator iter(&pending_updates_);
+  while (!iter.IsAtEnd()) {
+    pending_updates_.Remove(iter.GetCurrentKey());
+    iter.Advance();
+  }
+}
+
+void BrowserPluginGuest::SendMessageToEmbedder(IPC::Message* msg) {
+  embedder_render_process_host()->Send(msg);
+}
+
+}  // namespace content