Direct2D WebKit

Brent Fulgham, Apple

• Runs on Windows
  • iTunes
  • various utilities
  • EA
  • Sony (kind-of)

• Uses a proprietary port of CoreGraphics
  • off limits to anyone not at Apple

• Wrote version in the past that uses Cairo instead
  • doesn’t get updated as much
  • no hardware acceleration

• MotionMark
  • pretty fast on Windows (IE Edge): 284 points
  • WinCairo isn’t bad either: 166 points

• Cairo on Windows
  • CPU bound
  • barely uses GPU

• Windows 7+ has Direct2D
  • 2D graphics library
  • hardware accelerated
  • supports custom GPU shaders
    • opportunity to provide effects that aren’t easily accessible otherwise

• Tried replacing Cairo with Direct2D
  • only replaced basic calls
  • no architecture changes
  • much faster: 227 points (with rendering issues)
  • still needs work
    • SVG has problems (especially with text)
    • missing a lot of implementations

• Good path forward for Windows ports
  • Main work is finding the edge cases where rendering has issues
    • MotionMark has:
      • extra arcs
      • font handling issues
      • SVG text problems
  • Remaining work should be fairly small/focused tasks
  • Very few grand architectural changes needed