Compositor

[Eeems]

Supersedes #320

Overview of changes

• Add new display server that handles compositing multiple framebuffers onto the screen, as well as sending input to only the currently focused application.
• C++ library for applications to use to communicate with the display server
• Preload library built on top of the previously mentioned library, that will automatically handle running existing apps against the display server. Similar to rm2fb-client.
• QPA for Qt applications that handles communicating with the display server.
• All Oxide applications have been updated to use the new QPA
• Application Splashscreens have been removed, and instead there is now a notification indicating that the application is launching.
• When an application crashes, a notification will be raised to alert the user.
• New xclip application to expose the display server clipboards to scripts.
• New fbinfo application to spit out information about the current framebuffer device.
• drawFullscreenImage has been removed from the screen API.
• chroot capabilities have been removed from tarnish

Todo:

• [ ] Move test app to tests folder
• [ ] Fix issues
  • [x] Keyboard detection doesn't always work on resume of an app
  • [x] Automated lock fires even though there is activity
  • [x] Swipes aren't working
  • [x] Screenshot keyboard shortcut doesn't work (Shift+End+S or Shift+Meta+S)
  • [ ] display-server can still crash
  • [x] Force closing some applications (puzzles, harmony, etc) will cause them to crash as part of stopping
  • [ ] Tarnish will crash when stopping
  • [x] Screenshots don't appear to work
  • [ ] Does not use language keymaps provided by epaper-qpa
  • [x] Fix long press on buttons on rM1
  • [x] Fix exiting exclusive mode on rM1
  • [x] Task switcher crashes when closing app
  • [x] Screenshots fail on rM1
  • [x] Suspend screen does not work on rM1
  • [ ] Display server appears to have a memory leak
  • [ ] tarnish uses nearly 100% CPU usage on rM1 (Unless OXIDE_QPA_DEBUG_EVENTS=1)
  • [ ] Unable to open micro, nano, or htop in yaft or fingerterm
  • Nano and htop appears to be due to a mmap loop that uses all available memory
  • Sometimes the error will be that it can't open yaft-256color
  • [ ] vi fails to display anything in yaft
  • [ ] When applications crash, it sometimes freezes the display server
  • [ ] Desktop file validation doesn't know about exclusive flag
  • [ ] Exclusive mode is not exited automatically when starting tarnish, or if tarnish, or the app crashes
  • [ ] Add security for certain display server API calls that allow limiting what can use them
  • [ ] Lockscreen is sometimes skipped when resuming from suspend and in exclusive mode
  • [ ] Sort out event went missing during delivery! (nested sendEvent() is not allowed) warning from tarnish when resuming xochitl
• [x] Documentation
  • [x] Update liboxide documentation
  • [x] Add libblight documentation
  • [x] Add QPA documentation
  • [x] Update website documentation
  • [x] Application spec
    • [x] Removed chroot flag
    • [x] Removed directories
    • [x] Removed splash
    • [x] Added flags
    • nopreload
    • nopreload.compositor
    • nopreload.sysfs
    • exclusive
  • [x] Application Documentation
    • [x] Removed chroot
    • [x] Removed directories
    • [x] Removed splash
  • [x] Rot usage
    • [x] New compositor API
  • [x] Screen API
    • [x] drawFullscreenImage removed
  • [x] System API
    • [x] Remove leftAction, rightAction, homeAction, powerAction, topAction, bottomAction
  • [x] Update Oxide-utils doc
    • [x] Add xclip
    • [x] Add fbinfo
  • [x] Add compositor API
• [x] Add "raw" rm2fb mode for apps that don't work with the display server (i.e. xochitl)
• [x] Create oxide-client blight-client wrapper script
• [x] Add automated tests for the display server communiation protocol
• [x] Move all button handling to QML
• [x] Update package recipe
  • [x] Add display-server
  • [x] display-server
  • [x] oxide-client blight-client
  • [x] qpa
  • [x] Add fbinfo
  • [x] Update oxide-utils
  • [x] xclip

Application Compatibility

Application	Works with display server	Works with tarnish
KOReader	:heavy_check_mark:	:heavy_check_mark: 9
DOOMarkable	:heavy_check_mark:	:heavy_check_mark:
recrossable	:heavy_check_mark:	:heavy_check_mark:
Plato	:heavy_check_mark:	:heavy_check_mark:
Puzzles	:heavy_check_mark:	:heavy_check_mark:
Sill	:heavy_check_mark:5	:heavy_check_mark:5
TilEm	:heavy_check_mark:	:heavy_check_mark:
Calculator	:heavy_check_mark:	:heavy_check_mark:
ChessMarkable	:heavy_check_mark:	:heavy_check_mark:
harmony	:heavy_check_mark:	:heavy_check_mark:
keywriter	:heavy_check_mark:	:heavy_check_mark:
nao	:heavy_check_mark: 1	:heavy_check_mark: 1
rmFm	:heavy_check_mark: 1	:heavy_check_mark: 1
xochitl	:x: 2	:x: 2
whiteboard-hypercard	:x:3	:x:3
wikipedia	:x: 4	:x: 4
yaft	:heavy_check_mark:	:heavy_check_mark:
dumbskull	:heavy_check_mark:	:heavy_check_mark:
mines	:heavy_check_mark:	:heavy_check_mark:
wordlet	:heavy_check_mark:	:heavy_check_mark:
rpncalc	:heavy_check_mark:	:heavy_check_mark:
netsurf	:x: 6	:x:6
reterm	:x:7	:x:7
folly	:heavy_check_mark:5	:heavy_check_mark:5
sudoku	:heavy_check_mark:	:heavy_check_mark:
fingerterm	:x:10	:x:10

1. The surface closes between screens and shows the app behind it
2. Some UI display issues, and drawing will not update the display
3. Crashes entire display server with bad_alloc
4. Content will never load, will not display "Fetching..." message either.
5. Drawing lags behind very noticeably
6. Unable to access network
7. Application crashes
8. Application takes a long time to display before crashing
9. Requires updating the application registration to the following:

   {
   "displayName": "KOReader",
   "description": "An ebook reader application supporting PDF, DjVu, EPUB, FB2 and many more formats",
   "bin": "/opt/koreader/reader.lua",
   "icon": "/opt/etc/draft/icons/koreader.png",
   "type": "foreground",
   "workingDirectory": "/opt/koreader",
   "environment": {
   "KO_DONT_GRAB_INPUT": "1",
   "KO_DONT_SET_DEPTH": "1",
   "TESSDATA_PREFIX": "data",
   "STARDICT_DATA_DIR": "data/dict"
   }
   }

10. Many issues:
    • Will often freeze the display server and crash the application.
    • Unable to open side menu
    • OXIDE_PRELOAD_FORCE_QT=1
    • Side menu will now open
    • will have some of the UI rotate, but not the right direction.
    • The terminal itself will still display as if it's not rotated.
    • Will complain about an unknown special key 16777249 when pressing left ctrl
    • Will fail to start bash properly often will leave you unable to run any commands.

Future enhancements

• Make task switcher see different surfaces instead of list of apps
• Make tarnish aware of the surfaces, and just use apps as list of applications that can be launched
• Add flag to allow an application to be launched more than once
• Allow launching an application with arguments, useful for allowing one application to launch another one to handle a file path
• System-level on-screen keyboard
• System-level top bar from launcher

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