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The GNOME Shell Magnifier: Adding built-in magnification to the GNOME Shell desktop.

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Inclusive Design Research Centre (IDRC) at Ontario College of Art & Design (OCAD)

Inclusive Design Research Centre (IDRC) at Ontario College of Art & Design (OCAD)

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  • 1. The GNOME Shell Magnifier: Adding Built-in Magnification to the GNOME Shell Desktop Joseph Scheuhammer, Jorge Silva, Jan Richards Inclusive Design Research Institute OCAD University 7 – 8 October 2010 ÆGIS 1st International Conference, Seville, Spain
  • 2. GNOME Shell • New window and desktop manager for GNOME 3. • High Level: – Application and window switching. – Workspace manager. – Find and launch Applications. • Lower Level: – A compositing window manager. – 2D effects such as transparency and animation. – Leverages “Clutter”, scene-based representation of the desktop. 7 – 8 October 2010 ÆGIS 1st International Conference, Seville, Spain 2
  • 3. GNOME Shell Technologies • Clutter – Compositing. • D-Bus – Interprocess communication. • GSettings – Preferences storage, retrieval, modifications, and immediate response to preference changes. • A lot of available “power”. • How to leverage? • One way: magnification and screen enhancement. 7 – 8 October 2010 ÆGIS 1st International Conference, Seville, Spain 3
  • 4. Approaches to Screen Enhancement • Pixel-based vs. Compositor-based Magnification. • Pixel-based: – Grab a region of pixels. – Transform them in some way (e.g., magnify). – No concept of “objects” – just a region of dots. 7 – 8 October 2010 ÆGIS 1st International Conference, Seville, Spain 4
  • 5. Approaches to Screen Enhancement • Pixel-based magnification. 7 – 8 October 2010 ÆGIS 1st International Conference, Seville, Spain 5
  • 6. Approaches to Screen Enhancement • Compositor-based: • Abstract description at a higher level than raw pixels. • “Objects” – Sprites, textures, layers, groups of objects. – Object properties (e.g., colour, transparency). 7 – 8 October 2010 ÆGIS 1st International Conference, Seville, Spain 6
  • 7. Approaches to Screen Enhancement • Compositor-based magnification. 7 – 8 October 2010 ÆGIS 1st International Conference, Seville, Spain 7
  • 8. GNOME Shell: Clutter • Clutter/mutter compositing window manager. • Stage metaphor. • Desktop is the stage. • Windows, buttons, menus, icons are “actors”. • Actors can be atomic – contain no other actors. • Actors can be group, or containers of other actors. – Groups can contain atomic or other group actors. 7 – 8 October 2010 ÆGIS 1st International Conference, Seville, Spain 8
  • 9. GNOME Shell Stage (basic) • Stage: 7 – 8 October 2010 ÆGIS 1st International Conference, Seville, Spain 9
  • 10. GNOME Shell Stage • Task Switcher: 7 – 8 October 2010 ÆGIS 1st International Conference, Seville, Spain 10
  • 11. GNOME Shell Stage (basic) • Stage: 7 – 8 October 2010 ÆGIS 1st International Conference, Seville, Spain 11
  • 12. GNOME Shell Stage (with magnifier) • Stage: 7 – 8 October 2010 ÆGIS 1st International Conference, Seville, Spain 12
  • 13. GNOME Shell Magnifier • Can leverage compositing capabilities of Clutter to enhance the screen. • Magnifier is itself an actor. • Magnification is not an add-on but an intrinsic function of the desktop. 7 – 8 October 2010 ÆGIS 1st International Conference, Seville, Spain 13
  • 14. GNOME Shell: D-Bus • Interprocess communication – One process can call another. – Another application can invoke the magnifier. • Onscreen keyboard (GOK) – E.g., as focus is placed on a key that represents a menu item, show an enhanced version of that menu item. – Provides better context. • Orca Screen Reader – As user navigates UI, Orca asks for a magnified view of what has focus. 7 – 8 October 2010 ÆGIS 1st International Conference, Seville, Spain 14
  • 15. GNOME Shell: User Preferences • Configuration Management – Load and store preferences. – Modify preferences. – *Respond to changes in preferences as they happen. • Currently – Mouse tracking. – Screen position. – Magnification factor. – Cross hairs. – “Lens Mode”. 7 – 8 October 2010 ÆGIS 1st International Conference, Seville, Spain 15
  • 16. User Preferences: Mouse • Mouse Tracking – Centred. – Proportional. – Push. – None. 7 – 8 October 2010 ÆGIS 1st International Conference, Seville, Spain 16
  • 17. User Preferences: Screen Position • Screen Position – Full. – Top Half of Screen. – Left Half. – Right Half. – Bottom Half. – Arbitrary or User defined. 7 – 8 October 2010 ÆGIS 1st International Conference, Seville, Spain 17
  • 18. User Preferences: Magnification Factor • Magnification Factor – UI constrained from 1x through 10x . – Technically, less than 1 through very large • could act as a minifier. 7 – 8 October 2010 ÆGIS 1st International Conference, Seville, Spain 18
  • 19. User Preferences: Cross hairs • Cross hairs – Colour. – Opacity • Completely transparent through opaque. – Thickness. – Length. – Clip near centre • If cross hairs interfere with mouse image. 7 – 8 October 2010 ÆGIS 1st International Conference, Seville, Spain 19
  • 20. User Preferences: Lens • Lens mode – The magnified view follows the mouse. – Like a movable magnifying glass. – Interacts with mouse tracking modes. 7 – 8 October 2010 ÆGIS 1st International Conference, Seville, Spain 20
  • 21. User Preferences 7 – 8 October 2010 ÆGIS 1st International Conference, Seville, Spain 21
  • 22. Future Work • Colour inversion. • Brightness levels. • Contrast. • Multiple Screens. • Quick access for magnification – Keystrokes to increase/decrease magnification. – Mouse scroll wheel. • Enhance accessible objects – e.g., Toolbar. 7 – 8 October 2010 ÆGIS 1st International Conference, Seville, Spain 22
  • 23. Conclusions • Magnification built into next GNOME desktop. • Supports typical screen magnification/enhancement features. • Compositor-based leads to other ways to enhance the desktop. 7 – 8 October 2010 ÆGIS 1st International Conference, Seville, Spain 23
  • 24. The GNOME Shell Magnifier • GNOME Shell: – http://live.gnome.org/GnomeShell • GNOME Shell Magnifier: – http://live.gnome.org/GnomeShell/Magnification 7 – 8 October 2010 ÆGIS 1st International Conference, Seville, Spain 24