[documentation](fonts&inline): Add first crude documentation for Inline

Layout and font matching.

Signed-off-by: Desiatkin Dmitrii <[email protected]>

Author: d-desiatkin

src/SUMMARY.md

@@ -31,10 +31,12 @@
   - [Concurrency and parallelism\*](architecture/concurrency-and-parallelism.md)
   - [Further reading\*](architecture/further-reading.md)
 - [Directory structure\*](architecture/directory-structure.md)
+- [Fonts\*](architecture/fonts.md)
 - [Script\*](architecture/script.md)
   - [Microtasks\*](architecture/microtasks.md)
 - [Style\*](architecture/style.md)
 - [Layout\*](architecture/layout.md)
+  - [Inline Layout](architecture/inline-layout.md)
 - [Compositor\*](architecture/compositor.md)
 - [WebXR](architecture/webxr.md)
 - [WebGPU](architecture/webgpu.md)

src/architecture/FontsFlowchartLRArchitecture.mmd

@@ -0,0 +1,80 @@
+flowchart LR
+    subgraph Content Process
+        subgraph Script Thread
+            Script[[Script]]
+            FontContext[FontContext]
+            FontCache[Font Cache]
+            ScriptSystemFontServiceProxy[System Font Service Proxy]
+            ImageCache[Image Cache]
+
+            Script-->ScriptSystemFontServiceProxy
+            Script-->FontContext
+            Script-->ImageCache
+            FontContext-->FontCache
+        end
+
+        subgraph Layout Thread
+            Layout[[Layout]]
+        end
+
+        Script-->Layout
+        Layout<-->ImageCache
+        Layout<-->FontCache
+
+    end
+
+    subgraph Main Process
+        subgraph Embedder or Main Thread
+            Embedder[[Embedder]]
+            Compositor[Compositor]
+            WebRender[WebRender]
+
+            Embedder<-->Compositor
+            Compositor-->WebRender
+        end
+
+        subgraph Constellation Thread
+            Constellation[[Constellation]]
+            ConstellationSystemFontServiceProxy[System Font Service Proxy]
+            ResourceManager[Resource Manager]
+
+            Constellation-->ConstellationSystemFontServiceProxy
+            Constellation-->ResourceManager
+        end
+
+        subgraph System Font Service Thread
+            SystemFontService[[System Font Service]]
+            FontStore@{ shape: bow-rect, label: "Font Store" }
+
+            subgraph Platforms
+                subgraph MacOS
+                    MacFontList[Font List]
+                end
+
+                subgraph Windows
+                    WinFontList[Font List]
+                end
+
+                subgraph Linux / Android / OpenHarmony
+                    LAOFontList[Font List]
+                end
+            end
+
+            SystemFontService<-->FontStore
+            SystemFontService-->MacFontList
+            SystemFontService-->WinFontList
+            SystemFontService-->LAOFontList
+        end
+
+
+        Embedder-->Constellation
+        Embedder-->SystemFontService
+        Constellation<-->Compositor
+        Constellation-->FontCache
+        Constellation-->ImageCache
+    end
+
+    Layout-->Compositor
+    ScriptSystemFontServiceProxy<-->SystemFontService
+    ConstellationSystemFontServiceProxy<-->SystemFontService
+    Constellation<-->Script

src/architecture/FontsSequenceDiagram.mmd

@@ -0,0 +1,52 @@
+sequenceDiagram
+    box rgb(255, 173, 173) main thread
+        participant Embedder
+        participant WebRender
+        participant Compositor
+    end
+
+    box rgb(255, 214, 165) DevTools thread
+        participant DevtoolsServer
+    end
+
+    box rgb(253, 255, 182) JSEngine thread
+        participant JSEngine
+    end
+
+    box rgb(202, 255, 191) Constellation thread
+    participant Constellation
+    end
+
+    box rgb(155, 246, 255) Bluetooth thread
+    participant Bluetooth
+    end
+
+    box rgb(160, 196, 255) ResourceManager thread
+    participant ResourceManager
+    end
+
+    box rgb(189, 178, 255) Fonts thread
+        participant SystemFontService
+    end
+
+    box rgb(255, 198, 255) Canvas Paint thread
+        participant CanvasPaintThread
+    end
+
+    box rgb(255, 255, 252) Webdriver thread
+        participant Webdriver
+    end
+
+
+    Embedder->>DevtoolsServer: devtools::start_server
+    Embedder->>WebRender: webrender::create_webrender_instance
+    alt opts.multiprocess == false
+        Embedder->>JSEngine: script::init
+    end
+    Embedder->>Constellation: create_constellation
+    Constellation->>Bluetooth: BluetoothThreadFactory::new
+    Constellation->>ResourceManager: new_resource_threads
+    Constellation->>SystemFontService: SystemFontService::spawn
+    Constellation->>CanvasPaintThread: CanvasPaintThread::start
+    Embedder->>Webdriver: webdriver
+    Embedder->>Compositor: IOCompositor::new