fabric: em-square glyph coordinate convention (EM-X/EM-Y/G-LINE)

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Punch list §25 item 4.3.6 complete.
capsules/fabric.4th blocks 4916-4917: EM-UNITS, GOX/GOY/GSIZE/GCOLOR,
EM-X/EM-Y/G-LINE per §27.6.1, scaling/translating em-square strokes
into CART-PLOT screen coordinates via */. Verified live on amd64 via
a temporary probe (built, run once, reverted): two G-LINE test shapes
at GSIZE 100 and GSIZE 50, one leg each exercising a negative em-y
value chosen to hit */'s truncate-toward-zero behaviour, not a
multiple of EM-UNITS. Screendump pixel-bbox extraction matched
hand-calculated raster coordinates exactly on both shapes. Three-arch
acceptance boot clean, Stadium conservation unaffected
(resident_sum=43691 reservoir=21845 sum=65536 on all three).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

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This commit is contained in:

Robert Allan James

2026-08-09 18:53:02 -04:00

co-authored by Claude Sonnet 5

parent 980f902c7b

commit 82e948afe9

13 changed files with 54489 additions and 93 deletions

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logs/20260809-184959/amd64/qemu-amd64-20260809-184959.log

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logs/20260809-185037/aarch64/qemu-aarch64-20260809-185037.log

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logs/20260809-185127/riscv64/qemu-riscv64-20260809-185127.log

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