Blurhashes

[kiliankoe]

See https://blurha.sh

Supported by recent Nheko, here's an example event.

{
  "content": {
    "body": "clipboard(1).png",
    "info": {
      "h": 88,
      "mimetype": "image/png",
      "size": 49644,
      "w": 989,
      "xyz.amorgan.blurhash": "LyN^e:M|xuRjM{WAjsWB~qofRjof"
    },
    "msgtype": "m.image",
    "url": "mxc://neko.dev/DdbZYuZVfojsNyTRQLcYhfBG"
  },
  "origin_server_ts": 1588842151902,
  "sender": "@deepbluev7:neko.dev",
  "type": "m.room.message",
  "unsigned": {
    "age": 851
  },
  "event_id": "$koLgeRQUowo6gNwM23orig3isNlUNLYJU73gUpw8qm4",
  "room_id": "!xYvNcQPhnkrdUmYczI:matrix.org"
}

[kiliankoe]

Sending blurhashes appears to be a bit more involved than I initially thought since the matrix-ios-sdk apparently exposes no option to customize image events. This would also have to be figured out for #112 and would ideally involve adding an optional info dictionary argument to MXRoom.sendImage() in the matrix-ios-sdk itself.

[kiliankoe]

See matrix-org/matrix-ios-sdk#847