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A Hangul or CJK glyph is one em across, less than two cells of a
monospace Latin font (1.2 em for DejaVu Sans Mono), and was drawn from
the left of its cells, so syllables stood apart unevenly. A cached
glyph now keeps its advance in pixels, and a wide character's glyph is
drawn centred in its two cells.
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Surfaces that read keys (the display, through evdev) had only a US
layout's letters. After the 한/영 key (Lang1, or AltRight standing for
it), letter keys now give jamo that compose syllables in the entry line
(surfaces/hangul.c): an initial, a vowel and an optional final, joined
vowels and finals, a final that moves on to a vowel after it (도깨비불),
Shift's doubled consonants, a lone jamo as its compatibility letter. The
syllable being composed shows after the entry line; Backspace takes it
back a jamo at a time before deleting what was typed; Enter, Tab, the
toggle or any key but a letter finishes it. The script language gains
hangul, letters HEX and back to drive it.
The check types ten cases through it (안녕하세요, 값을, 안자, 와원, 까원,
갑 after Backspace, 한글, ㅏ, 안ㅈ, 안녕 2) and follows the composing line
jamo by jamo; the messenger check has Alice type 안녕 on her display with
recorded keys, drawn on Bob's.
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Vega in a node takes a second form, pixels --grid WxH --out PREFIX: each
frame the node's saves draw goes into PREFIX-N.ppm, no display
controller needed (one card takes one master, so a second node on the
machine draws this way). And in a node, recorded events no longer end
the surface: their last frame is printed when they end, and the node's
saves are drawn on until it stops, so an answer that comes later shows.
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The vega host builds a second way, as build/vega-surface.so, which
pure-serve maps and runs beside its connection threads (pure-serve
--surface vega-surface.so -- display ..., Pure's design 010). There the
app it draws is a reader of the node's last save, read where it is,
and what people type goes to the node's owner: a key press as the key
input's event, the typed line as the text input's, each applied and
saved with the node's requests. It waits on its input devices and the
node's changes descriptor together, leaves timers and signals to the
node, and stops with it. The library calls the app model pure-serve
exports and links none of its own; it exports pure_surface_run alone.
Without --live or --input it takes no input: the node's saves alone draw
it.
The check gives a node an item over HTTP, then runs the display in the
node with recorded keys (an item, Enter, Tab, Space): the last frame is
the one vega tui draws for the same state and keys, it came back from
the display controller as drawn, and the node's views show both items.
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vega display --live reads the kernel's input events with no library:
keys become Pure's key names and the text they type on a US layout, going
through the TUI's own handling (the input line takes text, else the app
takes keys); a mouse moves an outlined pointer and clicks, a touch screen
presses where it is touched, scaled from the device's range; the line
pressed is the row. --input FILE reads recorded events to their end and
prints the last frame, which is how this screenless Pi checks it: after
typing two items with Shift, Enter, Tab, Space and a touch on a row, the
display's last frame is the TUI's after the same keys and click, and came
back from the display controller as drawn.
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vega display draws the same frames on a display with the kernel's mode
setting and no library between: a connected connector's mode on a CRTC, its
primary plane flipped between two dumb buffers by atomic commits, the grid
as many cells as fit. Frames are drawn in cached memory and copied over,
since blending over write-combined buffers read them back slowly (a 1080p
frame took 370 ms; now 20.6 ms with a vertical sync and the check below).
This Pi has no screen but its display controller has writeback connectors:
--writeback sets a mode on one and takes every frame back as the controller
put it out. Each came back exactly as drawn, and the new check finds it the
pixel surface's frame for the same grid, pixel for pixel.
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vega pixels runs the same scripts as tui --dump and writes each frame as
an image: the view's cells (only those on screen are evaluated) become
glyphs, each drawn once per size with the exact area of its curves, in its
tone's colour on its row's background. No page, no scene in between. A
1920x1350 grid takes 12 ms a frame here, writing the image included.
Symbol files carry the font's line now (format 3: ascent and descent where
format 2 kept zeros), the cell height and baseline; and the build tool takes
fonts in order, later ones filling the codes earlier ones lack: a CJK font
alone drew ambiguous-width arrows two cells wide in a one-cell grid, which
the new check caught, so a monospace Latin font comes first and Hangul after.
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src/ held two parts, the surfaces that show modules to people and the
symbol format with its CPU and GPU drawing. As in Pure (design 009), top
level directories are now the parts, and the README says what each builds.
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