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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.