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Update TODO list

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Kristian Høgsberg 15 years ago
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      TODO

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TODO
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@ -1,21 +1,86 @@
- how does clients move their surfaces? set a full tri-mesh every
time? probably just go back to x and y position, let the compositor
do the fancy stuff. How does the server apply transformations to a
surface behind the clients back? (wobbly, minimize, zoom) Maybe
wobble is client side?
Core wayland protocol
- implement glyph cache and dnd
- when a surface is the size of the screen and on top, we can set the
- dnd, figure out large object transfer: through wayland protocol or
pass an fd through the compositor to the other client and let them
sort it out?
- copy-n-paste, store data in server (only one mime-type available)
or do X style (content mime-type negotiation, but data goes away
when client quits).
- protocol for setting the cursor image
- should we have a mechanism to attach surface to cursor for
guaranteed non-laggy drag?
- drawing cursors, moving them, cursor themes, attaching surfaces
to cursors. How do you change cursors when you mouse over a
text field if you don't have subwindows? This is what we do: a
client can set a cursor for a surface and wayland will set that
on enter and revert to default on leave
- Discard buffer, as in "wayland discarded your buffer, it's no
longer visible, you can stop updating it now.", reattach, as in "oh
hey, I'm about to show your buffer that I threw away, what was it
again?". for wayland system compositor vt switcing, for example,
to be able to throw away the surfaces in the session we're
switching away from. for minimized windows that we don't want live
thumb nails for. etc.
- Move/resize protocols? In the style of the dnd protocol, if a
surface has grabbed an input, it can request a resize (top/bottom |
left/right) or a move. Goes on for duration of grab or until
surface cancels. Surface gets resize(w,h) during resize events and
must reallocate buffer and redraw.
- Initial surface placement issue.
- Consolidate drm buffer upload with a create_buffer request, returns
buffer object we can use in surface.attach, cache.upload and
input.attach? Will increase object id usage significantly, each
buffer swap allocates and throws away a new id. Does consolidate
the details of a buffer very nicely though.
compositor.create_buffer(new_id, visual, name, stride, width, height)
surface.attach(buffer)
cache.upload(buffer, x, y, width, height)
input.set_cursor(buffer, hotspot_x, hotspot_y)
Doesn't increase id usage too much, can keep buffers around.
- Move/resize protocol in the style of the dnd protocol: a surface
who has a grabbed device can send a request to initiate a
resize(top/bottom+rigth/left) or a move. The compositor will then
resize or move the window and take into account windows, panels and
screen edges and constrain and snap the motion accordingly. As the
cursor moves, the compositor sends resize or move (maybe not move
events?) events to the app, which responds by attaching a new
surface at the new size (optionally, reducing the allocated space
to satisfy aspect ratio or resize increments).
- Initial placement of surfaces. Guess we can do, 1)
surface-relative (menus), 2) pointer-relative (tooltips and
right-click menus) or 3) server-decides (all other top-levels).
- When a surface is the size of the screen and on top, we can set the
scanout buffer to that surface directly. Like compiz unredirect
top-level window feature. Except it won't have any protocol state
side-effects and the client that owns the surface won't know. We
lose control of updates. Should work well for X server root window
under wayland.
under wayland. Should be possible for yuv overlays as well.
- what about cursors then? maybe use hw cursors if the cursor
satisfies hw limitations (64x64, only one cursor), switch to
composited cursors if not.
- clients needs to allocate the surface to be suitable for
scanout, which they can do whenever they go fullscreen.
- multihead, screen geometry and crtc layout protocol, hotplug
- input device discovery, hotplug
@ -24,45 +89,55 @@
"org.wayland.input.x" to identify the axes.
- keyboard state, layout events at connect time and when it
changes
changes, keyboard leds
- relative events
- input handling - keyboard focus, multiple input devices,
multiple pointers, multi touch.
- multi touch?
- wayland-system-compositor
- sparse/gcc plugin based idl compiler
- device kit/libudev/console kit integration to discover seats,
that is, groups of input devices and outputs that provide a
means for one user to interact with the system. That is,
typically a mouse, keyboard and a screen. The input devices
will just be evdev devices, the outputs will be a drm device
filename and the specific outputs accessible throught that drm
device.
- crack?
- send drm device in connection info, probably just udev path.
- xml based description instead?
- cairo-drm; wayland needs cairo-drm one way or another:
- actually make batch/commit batch up commands
- chris wilson (ickle) is doing cairo-drm for i915 now, basically
the pixman-drm idean, but inside cairo instead.
- auth; We need to generate a random socket name and advertise that
on dbus along with a connection cookie. Something like a method
that returns the socket name and a connection cookie. The
connection cookie is just another random string that the client
must pass to the wayland server to become authenticated. The
Wayland server generates the cookie on demand when the dbus method
is called and expires it after 5s or so.
- pixman-drm; move the ddx driver batchbuffer logic into libdrm
and write native, direct rendering acceleration code in
pixman-drm. is a clean approach in that we avoid the mess of
the global GL context leaking through to applications, and we
can bootstrap this project by pulling in the EXA hooks from the
DDX drivers.
- or just pass the fd over dbus
- use open gl behind the scenes a la glitz.
- drm bo access control, authentication, flink_to
- should be possible to provide a realistic api and then stub out
the implementation with pwrite and pread so gtk+ port can proceed.
- Range protocol may not be sufficient... if a server cycles through
2^32 object IDs we don't have a way to handle wrapping. And since
we hand out a range of 256 IDs to each new clients, we're just
talking about 2^24 clients. That's 31 years with a new client
every minute... Maybe just use bigger ranges, then it's feasible
to track and garbage collect them when a client dies.
- Add protocol to let applications specify the effective/logical
surface rectangle, that is, the edge of the window, ignoring drop
shadows and other padding. The compositor needs this for snapping
and constraining window motion. Also, maybe communicate the opaque
region of the window (or just a conservative, simple estimate), to
let the compositor reduce overdraw.
- multi gpu, needs queue and seqno to wait on in requests
- synaptics, 3-button emulation, scim
- what to do when protocol out buffer fills up? Just block on write
would work I guess. Clients are supposed to throttle using the
bread crumb events, so we shouldn't get into this situation.
- XKB like client side library for translating keyboard events to
more useful keycodes and modifiers etc. Will probably be shared
between toolkits as a low-level library.
Clients and ports
- port gtk+
@ -131,66 +206,3 @@
- clutter as a wayland compositors
- argh, mutter
- make libwayland-client less ghetto
- sparse based idl compiler
- crack?
- xml based description instead?
- actually make batch/commit batch up commands
- protocol for setting the cursor image
- should we have a mechanism to attach surface to cursor for
guaranteed non-laggy drag?
- drawing cursors, moving them, cursor themes, attaching surfaces
to cursors. How do you change cursors when you mouse over a
text field if you don't have subwindows? This is what we do: a
client can set a cursor for a surface and wayland will set that
on enter and revert to default on leave
- server should be able to discard surfaces, and send a re-render
event to clients to get them to render and provide the surface
again. for wayland system compositor vt switcing, for example, to
be able to throw away the surfaces in the session we're switching
away from. for minimized windows that we don't want live thumb
nails for. etc.
- auth; We need to generate a random socket name and advertise that
on dbus along with a connection cookie. Something like a method
that returns the socket name and a connection cookie. The
connection cookie is just another random string that the client
must pass to the wayland server to become authenticated. The
Wayland server generates the cookie on demand when the dbus method
is called and expires it after 5s or so.
- or just pass the fd over dbus
- drm bo access control, authentication, flink_to
- Range protocol may not be sufficient... if a server cycles through
2^32 object IDs we don't have a way to handle wrapping. And since
we hand out a range of 256 IDs to each new clients, we're just
talking about 2^24 clients. That's 31 years with a new client
every minute... Maybe just use bigger ranges, then it's feasible
to track and garbage collect them when a client dies.
- multi gpu, needs queue and seqno to wait on in requests
- opaque region, window rect
- save and restore state on crash, clients reconnect, re-render
buffers
- how do apps share the glyph cache? what is the glyph cache, how
does it work? pixbuf cache?
- synaptics, 3-button emulation, scim
- what to do when protocol out buffer fills up? Just block on write
would work I guess. Clients are supposed to throttle using the
bread crumb events, so we shouldn't get into this situation.

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