Chromium

Chromium - , Blink Google The Chromium Authors . Chromium Google Chrome, 60%. , , Firefox, Edge, Safari , . , Chromium Google Chrome, . Google Chrome = Chromium + Google Update + + .

Chromium / Chrome , --single-process. , , :

```
,         ;
```
```
  .       IPC  Mojo.
```

2 5 ( ). Browser process ( ) . . , , Renderer process ( ). Utility process ( ), , . Linux Zygote process (). , : , , GPU process ( ).

Browser process

, Browser process . , , , (, ).

Browser process , . -, Renderer thread. , . DB, File Cache , , . Process Launcher thread, , , Zygote GPU. , Browser process Worker thread ( ). ( DNS) WorkerPool. , Browser process . . . . Browser process , IPC. , . Browser process URL.

Zygote process

, Linux, , Zygote process. , , Renderer process. , Chromium. TaskAnnotator TaskRunner. Zygote process , , , , , . , Zygote process , , Renderer process.

 ,         .    ,    .   Chrome         .     Chrome    . ,      -  .     ,      .    exec   ,       ,      ,       .   ,    Chrome   (),     (fork)  ,      .  ,           ,     .  -   ,       ,       .

Renderer process

Linux Renderer process Zygote process, , . Renderer process , ( Chrome/Chromium, Renderer process). , , - . Renderer process . : I/O thread ( -), Compositor thread ( ) Raster thread ( ). , (IPC , , ), ScriptController V8.
Utility process

Linux Utility process Browser process. Utility process . . ResourceBundle, icu V8 Engine. . Utility process . , Utility process, .
GPU process

, GPU. , . , GL/GLES . : , , .

Startup
- ```
 (Main)
```
- Main ContentMain BrowserMain
- BrowserMain MainMessageLoop
Threads
- I/O thread
- DB thread
  - sqlite
- Cache thread
- Worker threads
  - , (event loop)
  - , WorkerPool, ( )
  - ```
  POSIX  -POSIX-
```
Loop
- MainMessageLoop
  - ,
  - ```
  IPC
```
IPC / Mojo
- ,
- MainMessageLoop
- ,
- ,
TaskAnnotator
- ```
 TaskAnnotator,     
```
- ```
  .    ,   ,     
```
ResourceLoader
- ```
 (Renderer, Worker  ..)
```
- ```
URLRequests
```
- URLRequests
URL
- ```
 URL-
```
- URL / URL-
- URL
- ```
URL-
```
- URL
- () URL
- Omnibox ( Chromium)
SQL
- , sqlite3
- / url
- favicons
net
- NetworkDelegate
- ```
URLRequest
```
- URLRequests
- cookie
- ```
cookie   URL- 
```
- cookie URL-
- SSL-
- , SSL
- SSL

Compositor (cc)

PaintFrame
- ```
 (, )
```
- ```
Aura     
```
Swap
- 2D-
- swap-

RasterTask

```
 :
```
- :
- : ,
```
   2D-
```

Skia,      (drawColor, drawPicture, drawRect, fillRect,  ..)

X11/Windows/Mac
- , Chromium

UIEvent

```
   ui (    )
```

    , , mousemove, mouseclick, keypress  . .

URL- (URLBar), URLBar
Aura:
- UI framework,
- ```
   Chrome OS / Chrome / Chromium
```
- Chrome OS, Chrome / Chromium
- Aura ,

Startup
- ```
 "Browser process"
```
Zygote
- ```
 Zygote-
```
Fork
- Zygote- (forked), Renderer
Loop
- MainMessageLoop
  - ,
  - ```
  IPC
```
IPC / Mojo
- ,
- MainMessageLoop
- ,
- ,
TaskAnnotator
- ```
 TaskAnnotator,     
```
- ```
  .    ,   ,     
```
callback
- ```
 ,     
```
Scheduler
- ,
- TaskQueueManager
  - ```
  N          .        :
```
blink::HTMLDocumentParser
- HTML-
- DOM
autofill
- AutofillAgent Autofill, WebKit
- APR (AutofillAgent per RenderFrame)
- Autofill :
  - Autocomplete
  - ```
  ,   ,         ,   .
```
icu
- ```
 unicode         ,        
```
- icu , ,
content::ResourceDispatcher
blink::TimerBase
blink::FrameLoader
- ```
()
```
blink::EventHandler
- , , , , ,
- hit- (hit detection, picking, pick correlation)
blink::EventDispatcher
- ,
blink::Document
- blink::DocumentLoader
- CSS (blink::StyleResolver)
media::DecoderStream
- DemuxerStream , (Audio/VideoRendererImpl)
blink::ScriptRunner
- JavaScript
content::RenderThread
- , Renderer Zygote ( )
blink::V8Initializer
- ```
    V8
```
extensions
- extensions-
- ```
Chrome      content-
```
blink::WorkerThread
- ,
- ```
  WorkerThread
```
- WorkerScriptController::initializeContextifNeeded JavaScript V8
Compositor (cc)
- :
- , ( )

Skia

Blink-

Skia,     (drawColor, drawPicture, drawRect, fillRect  ..)

blink::ImageDecoder
- ImageDecoder , (, JPEGImageDecoder). ImageFrame.
content::WebGraphicsContext3DCommandBuffer
- 3D
- GpuChannelHost, :
- IPC- GPU
- GPU GpuChannel
- ```
   ,    -
```
RasterTask
- ```
 :
```
  - :
  - : ,
- gpu::gles2::QueryTracker
gpu::gles2
- QueryTracker
- QueryManager
  - ```
  ,    ,   QueryManager   
```
- content::CommandBufferProxyImpl
- -, CommandBufferStub

Startup
- ```
 "Browser process" (  Zygote-)
```
Renderer
- Renderer- (forked) Zygote-
Loop
- MainMessageLoop
  - ,
  - IPC
IPC / Mojo
- ,
- MainMessageLoop
- ,
- ,
TaskAnnotator
- ```
 TaskAnnotator,     
```
- ```
  .    ,   ,     
```
Scheduler
- , ,
- TaskQueueManager
  - ```
  N          .        :
```
content::MessageRouter
- MessageRouter , , ,
- ```
     , MessageRouter     ,      
```
content::RenderWidget
- RenderWidget WebWidget RenderWidgetHost,
- ```
 OnMessageReceived
```
- ```
 blink::handleInputEvent
```
- , , , tooltip, hit-
- IPC
content::InputHandler
- content::InputHandlerManager
  - InputHandlerProxy WebView
- content::InputHandlerProxy
  - -, . InputHandlerProxy . InputHandler , WebWidget
  - Compositor
Compositor (cc)
- Compositor gfx GL/GLES
blink::ScriptController
- JavaScript V8ScriptRunner
V8
- JavaScript- Blink
- JavaScript
- ```
 DOM-
```

Startup
Utility
Loop
- MainMessageLoop
  - ,
  - ```
  IPC
```
IPC / Mojo
- ,
- MainMessageLoop
- ,
- ,
Extensions
- ExtensionsHandler
  - IPC Chrome
- UtilityHandler
  - ```
   IPC,   ,   
```
- unpack extensions
  - extensions::Unpacker
    - , ,
ResourceBundle
- ResourceBundle
icu
- icu
- TimeZone
V8Initializer
- V8
- V8

Startup
- ```
  GPU
```
Loop
- MainMessageLoop
  - ,
  - ```
  IPC
```
IPC / Mojo
- ,
- MainMessageLoop
- ,
- ,
TaskAnnotator
- ```
 TaskAnnotator,     
```
- ```
  .    ,   ,     
```
GPU Command Buffer
- IPC (, )
- (Set/Get buffer, Flush, Create/Destroy Images ..)
gfx::GLSurface
- , GL,
gfx::GLContext
- OpenGL,
GLES2 Decoder
- GLES2
- GL
Shader, Texture, , Draw elements
- OpenGL
- (bind, remove, setTarget . .)
- ```
GLContext
```
Swap buffers
- swap
- ,