@oh-just-another/raster-wasm

WASM-backed Rasterizer (flatten / strokeToFill) for the diagram renderer.

L2. Implements @oh-just-another/renderer-core's Rasterizer interface. Until a WASM module is loaded, it delegates to the pure-JS jsRasterizer from @oh-just-another/renderer-core; loadModule(...) swaps in a real WASM build at runtime. No module is bundled.

Install

pnpm add @oh-just-another/raster-wasm

Quick start

import { WasmRasterizer } from "@oh-just-another/raster-wasm";

const rasterizer = new WasmRasterizer();
await rasterizer.loadModule("/raster.wasm"); // optional — JS fallback used until then

const editor = new Editor({ rasterizer /* … */ });

Expected WASM exports

interface WasmRasterizerExports {
  memory: WebAssembly.Memory;
  alloc(bytes: number): number;
  free(ptr: number, bytes: number): void;
  flattenF32(
    commandsPtr: number,
    commandsLen: number,
    tolerance: number,
    outPtrOut: number,
    outCountOut: number,
  ): void;
  strokeToFillF32(
    polylinePtr: number,
    polylineLen: number,
    width: number,
    cap: number, // 0=butt, 1=round, 2=square
    join: number, // 0=miter, 1=round, 2=bevel
    outPtrOut: number,
    outCountOut: number,
  ): void;
}

Commands are packed into a Float32 array: [kindEnum, x0, y0, x1?, y1?, x2?, y2?] per command (variable width). Output Vec2 arrays are returned by writing outPtr + outCount to caller-provided host pointers.