chromium显示网页-笔记

原文display a web page in chrome

层

• Browser
  • 代码位置：src/chrome/browser
• Tab contents
  • 代码位置：src/chrome/browser/tab_content
• Render host
  • 代码位置：src/chrome/browser/renderer_host
• Render
  • src/chrome/rendererer
  • RenderView
  • 代码位置：/content/render/renderviewimpl.cc
  • 继承于RenderWidget，RenderWidget负责input处理和绘制
• Webkit glue(WebView, WebWidget, WebFrame, etc)
  • 代码位置：src/webkit/glue
  • 封装webkit接口
  • 转化webkit内建类型为chromium类型，如，std::string 代替 WebCore::String；GURL代替KURL。
  • 简化webkit对象命名，如：WebCore::Frame 变成 WebFrame
  • test shell基于glue的测试程序
• Webkit/Webkit Port
  • 代码位置：third_party/Webkit
  • webkit开源代码，Port是webcore平台相关接口的实现

1. browser process的UI thread创建RenderProcessHost
2. RenderProcessHost创建render process并在browser process的I/O thread中创建ChannelProxy
3. ChannelProxy监听命名管道，将消息转发给RenderProcessHost
4. ChannelProxy中包含ResourceMessageFilter过滤某些消息（如网络通信）直接交给I/O thread 处理
   • ResourceMessageFilter::OnMessageReceived()
5. RenderProcessHost将view相关消息派发给RenderViewHost处理，本身处理view无关消息
   • RenderProcessHost::OnMessageReceived()
6. view相关消息在RenderViewHost和RenderWidgetHostView基类中处理
7. RenderView(Widget)Host都有与之对应的RenderView(Widget)位于render process，
8. 每个平台都有一个 (RenderWidgetHostView[Aura|Gtk|Mac|Win])用于集成至平台。

  render process                               browser process
       |                                            |
    +--+--------------+                +---------------------+
    |                  \              /                       \
render thread        main thread    I/O(IPC) thread     Main browser(UI) thread
    |                    |            |                         |
 webkit                  |            |                         |
    |                    |            |                         |
renderWidget::SetCursor  |            |                         |
    |                    |            |                         |
renderView::Send()       |            |                         |
    |                    |            |                         |
RenderThead::Send()      |            |                         |
    |            IPC::SyncChannel     |                         |
    |                    |-----IPC----|                         |
    |                    |      IPC::ChannelProxy               |
    |                    |            |                         |
    |                    | ResourceMessageFilter                |
    |                    |            |                         |
    |                    |            |   RenderProcessHost::OnMessageReceived
    |                    |            |                         |
    |                    |            |    RenderViewHost::OnMessageReceived
    |                    |            |                         |
    |                    |            |     RenderViewHost::OnMessageReceived
    |                    |            |                         |
    |                    |            |     RenderWidgetHost::OnMsgSetCursor 
    |                    |            |                         |

  render process                               browser process
       |                                            |
    +--+------------------------+                +---------------------+
    |                            \              /                       \
render thread                 main thread    I/O(IPC) thread     Main browser(UI) thread
    |                             |            |                         |
    |                             |            | RenderWidgetHost:ForwardMouseEventToRenderer
    |                             |            |                         |
    |                             |            |                   WebMouseEvent 
    |                             |            |                         |
    |                             |            | RenderWidgetHost::ForwardInputEvent
    |                             |            |                         |
    |                             |            |          RenderWidgetHost::Send
    |                             |      IPC::ChannelProxy               |
    |                             |----IPC-----|                         |
    |                         IPC::Channel     |                         |
RenderView::OnMessageReceived     |            |                         |
    |                             |            |                         |
RenderViewHost::OnMessageReceived |            |                         |
    |                             |            |                         |
RenderWidgetHost::OnMsgSetCursor  |            |                         |
    |                             |            |                         |