Text rendering

[kpreid]

As discussed in 95a1578cde6ed0a51efe7f3febcb12f8b56bf924, I am adding Primitive::Text, text rendering in blocks without rendering to an intermediate space, for more efficient rendering and better interactive editability. The feature needs work:

• [x] Specify text positioning via a bounding box, so that we can tolerate font changes better and more reasonably specify location (b2ef5818309fdb59b6d6571c38705aa38102dec5)
• [ ] Optional truncation/ellipsis of long text
• [ ] Usage and demos:
  • [x] Add a vui::widgets::Label that displays static text blocks from a string. (03fd53fe5ab668acd528dbfffccecb9fce64c1dd)
  • [ ] Add a vui::widgets::TextBox that displays dynamic and eventually editable text.
  • [x] Add text labels to vui::widgets::*Button. (84e332284cf38a9adbaddbafa24677628af38092)
  • [ ] Replace all or most existing text rendering
• [ ] Resolution and Z/depth issues:
  • [x] Explicitly chosen resolution / text sizing within block
  • [x] Add a means to get outlined text (as used in the existing tooltip and logo) efficiently — this will increase thickness
  • [ ] We may want characters to be able to have depth themselves (3D emoji)
  • [ ] Flag indicating intent to engrave the text, so all features should touch the front face and be legible as monochrome
• [ ] Fonts (and eventually replacing embedded-graphics — #528)
  • [ ] Create or find a good set of “system fonts”
  • [ ] Add user-defined font support
• [ ] Specify, test, and demonstrate the layout of multiline text
• [ ] Fix numeric overflows possible by large layout numbers (see b4ebb67e71f1c4f80370570659fc90a132b11356)

[kpreid]

As of 1791e75a2eb4c6b184ac3b86dcd9871ee016b445 we have a Label widget, and each Text has a layout_bounds box and resolution.

[kpreid]

f4e256cfe0dca410b2c4266176a01826fd61a0cf adds outlined text. However, I ran into trouble trying to actually use it for the Tooltip widget — nothing is visible even though all the layout looks correct. (The bug is not specific to outlined text.) I think I need better debugging tools for block definitions — some kind of “why is this invisible” report.

[kpreid]

84e332284cf38a9adbaddbafa24677628af38092 adds text for button labels (but much work is needed on tuning the layout).

[kpreid]

570d7df5b3b2376f446ce31fda8423a3dcd4cd7f converts the Tooltip widget to use text blocks. It reveals our lack of proper bounding box handling for outlined text.