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vega_draw keeps what it wrote as spans (VegaSpan: a row, the columns it
was given, where its cells reached, its text and tone). A span written
where the same pen stopped follows the one before it (a field's name and
value, the help line, the prompt); one written after the pen moved (a
table's column, a list's label, a badge) starts afresh at its column, and
a badge sits flush with its end.
When the first font shapes, the pixels set type: a span and those
following it are one line of text, laid out as one paragraph in the font
stack (bidi and kerning cross the spans; each glyph takes the tone of the
span its character came from), from its column up to the nearest of its
spans' ends and the next span on the row, cut at a grapheme cluster
boundary with an ellipsis if it must be. The prompt gets a text cursor.
--symbols repeats: fonts in order of preference (at most 8); the cells,
when the first font does not shape, also fall back through them.
The check sets a label in one script, alone in its list, and holds it to
what the font that has it sets by itself (vega-symbols paragraph, which
now sizes itself to its text with width 0), pixel for pixel: Latin
kerning, Hangul, Arabic and Devanagari over DejaVu Sans, Noto Sans CJK KR
and FreeSans.
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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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