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A pane image is re-emitted to the client as decoded RGBA, which for one
screenshot is ~4MB of base64 in a single indivisible message -- and
conn_send silently dropped anything that would overflow the 4MB outbox,
while push_graphics ignored the refusal and the model advanced anyway.
Everything stateful in that dropped frame was lost for good: the image
was marked sent (so its placements drew nothing, forever), and the
deletions rode out with it (so a placement the client had was never
revoked). Reported as screenshots in a recovered pi transcript parked
at a fixed spot on the screen, immune to scrolling and pane swaps --
those were placements whose deletion left with a dropped frame. The
1000x800 one could never be delivered at all: its transmission alone
was bigger than the cap.
So the frame is now transactional. Deletions queue and are repeated
every flush until gfx_commit() confirms the client heard them;
transmissions recorded in a frame are unwound by an undelivered commit
so they are sent again. A flush nobody commits counts as undelivered at
the next gfx_begin(), which is what the `graphics` control command is:
bytes rendered for a CLI, not the client. The server reports the
verdict and keeps the paint pending until it lands.
The outbox cap now bounds the backlog rather than backlog-plus-message,
so one big transmission on a drained queue always fits -- and that
surfaced a second way to lose: a queued image legitimately holds the
backlog over the cap until the client swallows it, and push_frame read
that as a dead client and closed the connection. The session
auto-detached every time a screenshot crossed the wire. A full outbox
is a client that is *behind*, not gone: push_frame now marks the screen
for a full repaint (the dropped diff means the client's cells are
unknown) and retries as POLLOUT drains the queue; a client that truly
left still shows up as a write error there.
The headless suite pins the owed-until-committed contract; the new
tests/live_graphics.py drives the real socket with a
bigger-than-the-cap image and a reader that stalls, and would have
caught both bugs: the flood must not detach, the transmission must
arrive whole, and a placement scrolled away must be deleted -- then
come back on scroll without a second copy of the pixels.
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The out-of-the-box look, rethought as one piece:
- the compiled-in palette calms down: muted blue #7aa2f7 on the same
neutral darks, with the colours that mean something kept semantic --
amber bell, red-orange dead. sl0p stays one include away as the house
style, and contrib/themes/default.kdl is the starting point written
down (theme-tour shows it).
- derived state defaults now actually follow the theme: the scrolled
wash is rebuilt from scroll_bg after the theme block (it used to bake
the compiled accent), and declaring a state -- in any file of an
include chain -- still wins. The dump writes derived states as
comments so C-a e cannot pin what is meant to keep following.
- a bell you can see: the frame blinks three times in theme's bell
colour then breathes until answered, and a soft diagonal shimmer --
the bell colour halved towards default_fg, width breathing on a sine
-- crosses the body for the same 900ms. bell_indicator false silences
all of it; states { bell { } } replaces it like any state. since
carries the clock dependency, so an idle session pays nothing.
- scrollback says where it continues: while scrolled, the viewport's
top and bottom rows melt towards an edge with content past it and
turn solid at the buffer's end. New expression variables above/below
(lines hidden past each edge, own dependency bit, cached per scroll
position), carried in shade_ctx_t -- SLOSH_SHADER_ABI 3 -> 4.
- expressions survive the dump: a program keeps its source and cb_chain
writes it back, so amount="(y % 2) * 40" no longer dumps as a number.
- headers move to include/, -Iinclude everywhere; the plugin Makefile's
SLOSH var becomes SLOSH_DIR because slosh exports SLOSH=1 into every
pane it runs, and building from inside a session read that as a path.
- comment drift culled where features outran the prose, and the
derivation boilerplate folded into derived_pass()/ctx_scroll().
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