1. Redefining Mobile
Graphics Stack
Ariya Hidayat

2. whoami

3. ariya hidayat
10+ years activity in FOSS
was with Nokia, Qt
now with Qualcomm Innovation Center

4. goals
Share ideas!
Provoke brainstroming!

5. share the love
gitorious.org/qt-labs/graphics-dojo
gitorious.org/ofi-labs/x2

6. hot devices

7. iPhone 3GS
iPhone OS 3.1
320 × 480, 163 ppi
OpenGL ES 2

8. Nexus One
Android 2.1
480 × 800, 252 ppi
OpenGL ES 2

9. Nokia N900
Maemo 5
800 × 480, 267 ppi
OpenGL ES 2

10. pixel control

11. line drawing
Bresenham line algorithm

12. anti-aliased line drawing
Xiaolin Wu's line algorithm

13. polygon rasterization

14. path rasterization

15. transformation
Scaling Rotation Perspective

16. perspective transformation

17. optimizations

18. blazing fast recipes
● alternative/faster code path
● avoid text layout whenever possible
● malloc-free common operations
● auto-adjustment of quality vs speed

19. hardware support & abstraction
pixmap GLtexture VGImage
layer display list VGPath
FBO
optimize further with smart caching

20. use-cases guided profiling
app -graphicssystem trace
qttracereplay painting.trace
cairo-trace –profile app
cairo-perf-trace painting.trace

21. multithreaded painting

22. multithreaded painting

23. efficient animation

24. goodies

25. color spaces

26. high-dynamic range

27. Dean S. Pemberton
Old St Paul’s

28. special effects

29. lighting & shadow

30. night mode

31. geometrical deformation

32. underwater effect
remember Quake 1?

33. genie

34. (perceptive) faster response
SVG up- and down-scaling
optimize using tiles

35. progressive zoom
user clicks “Zoom 2x”
smooth scaled
fast but “blocky”

36. shape morphing
digital clock
analog clock

37. physics

38. kinetic scrolling
Mouse move
Pressed
Manual Scroll
Mouse release
Steady Mouse release
Mouse
move Auto Scroll
Mouse press
Stop
Timer tick

39. easing curve
Linear EaseInOut
deacceleration
acceleration

40. parallax effect

41. 2.5 dimension
215 lines of code

42. 2-d physics engine

43. photo slide

44. network ubiquity

45. distributed system (autoreplication?)
in some remote
machine

46. assistive technology

47. element tagging
clock
weather
launcher
autozoom
contact

48. voice recognition (for driving?)

49. spread the love

50. gitorious.org/ofi-labs/x2

51. muito obrigado!