X11R8 brainstorming

Idea collection for X11R8

Deprecation:

Deprecated features should continue being supported until X11R9, but clients really should not use them anymore. Build-time opt-out in xserver for those.

• xorg/proto/xorgproto!1 4bit alpha pixmaps
• non-bigreq

Mandatory extensions:

Some set of (network transparent / cross-platform) extensions should be made mandatory, thus clients must no longer provide fallback.

(note: Xnest still lacking several ones)

• render (not supported by Xnest yet)
• mit-shm (not supported by Xnest yet)
• bigreq

Widening constraints:

Several contrains that made sense on old HW may be widened, eg.

• assume RGB(A) is always supported
• allow non-matching visuals of windows & pixmaps, as long as all can be converted into RGBA
• server must do necessary conversion automatically

Additions:

• PNG & JPEG support
  • directly create pixmaps from PNG or JPG (with parameter auto detection)
  • capture into PNG or JPG
• native compression
  • packets can be collected into batches which are compressed (eg. XZ/LZMA)
• native video decoding
  • xserver should be made multithreaded first