Porting Flutter's Engine

Flutter's engine is designed to be portable. We don't have a single porting interface, but this wiki attempts to document the engine's dependencies at a high level.

##Dependencies by Code Region

base/ (required)

• event loop
• file system (also used by dart:io)

skia/ (required to draw to the screen, not for headless unittests)

• OpenGLES2 or 3. (Can render entirely in software, but it's slow.)
• EGL-like-thing for context creation, etc. (already plumbing for GLX, EGL, MGL, etc.) see https://github.com/flutter/engine/tree/master/sky/shell/gpu/direct
• Fonts (e.g. fontconfig and freetype, or android ones, etc.) used by sky/engine

sky/services/vsync (optional, but you really want this to go fast)

• vsync callback

sky/services/engine (required):

• touch input,screen geometry, etc. interfaces implementation

services/keyboard (optional)

• keyboard input linux and android ios

##Known Ports

• Android (Jelly Bean, v16, 4.1.x or newer)
• iOS devices and simulators (iOS 8.0+)
• Mac
• Linux (headless/no graphics)