Schematic widget render preview
A headless-Chrome harness that renders the real src/schematic-widget.js
(with the custom src/openroad_skin.svg) against representative gate netlists
and writes a PNG + SVG for each. Use it to visually check the gate symbols
(AND/OR/XOR/inverter/buffer and the compound AOI/OAI) and to inspect the
rendered netlistsvg DOM when iterating on the skin.
The viewer renders gates natively via netlistsvg: the server tags cells with a
gate_kind hint, canonicalizeForSkin rewrites them to the canonical types the
skin draws, and netlistsvg lays them out. This tool serves src/ directly, so
it picks up edits to openroad_skin.svg and schematic-widget.js immediately.
This is a developer tool, not part of CI: it needs a local Chrome and loads the netlistsvg JS bundle from its CDN (same as the viewer itself).
Setup (one-time)
cd src/web/test/visual
npm install puppeteer-core
You also need Google Chrome / Chromium. The default path is
/usr/bin/google-chrome; override with CHROME=/path/to/chrome.
Run
node preview.mjs [outDir]
Renders and2, or2, inv, buf, nand2, nor2, xor2, aoi21, aoi22,
and oai21. Each produces <name>.png (screenshot) and <name>.svg (the
rendered SVG DOM) in outDir (a temp dir is created and printed if omitted).
Open the PNGs to check that:
- the generic box is replaced by the gate outline (no leftover rectangle),
- inputs meet the symbol on the left at their real port positions,
- the output point / inversion bubble sits on the output wire,
- AOI/OAI first-level gates abut the second-level gate (no connector stubs).
node_modules/ here is git-ignored; the tool itself is just preview.mjs.
Regenerating gate symbols
The compound (AOI/OAI) and wider (>2-input) gate symbols in
../../src/openroad_skin.svg are generated:
node gen_compound.mjs # aoi21/aoi22/oai21/oai22 <g> symbols
node gen_multi.mjs # and3/4, or3/4, nand3/4, nor3/4 <g> symbols
Paste the printed <g> blocks into openroad_skin.svg, and add the new type
names to SKIN_COMPOUND_TYPES / SKIN_MULTI_TYPES in
../../src/schematic-widget.js so the viewer maps cells to them.