todo.txt

- some stuff may be flag dependent
  e.g. should setTitle be available for non-decorated and fullscreen Wins

? sdlexception : runtime_error
? force win/ren functions to be const
? remove RectXY
- add not-graphics sdl features
- won't support documentation for window ids

- string representations of enums
- enum-like classes are mostly unsafe because they rely on the SDL enum being valid

PixelFmt
  ? better order + layout api

- Win may not live less than Ren
- Ren may not live less than Tex

TexLock
  - make full-texture lock unambigious
  ? get the format mask in a different way
    - SDL_PixelFormatEnumToMasks

Tex locks don't check that the texture handle isnt null when accessing it

geom::Size has signed dimensions

flag structures cannot be cloned

doxygen
  - exceptions dont have links
  - add exception documentation