All files / src/components/sprites/preview MetaspriteCanvas.tsx

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import React, { memo, useCallback, useEffect, useState } from "react";
import { useAppSelector } from "store/hooks";
import { DMG_PALETTE } from "consts";
import {
  metaspriteSelectors,
  metaspriteTileSelectors,
  spriteSheetSelectors,
} from "store/features/entities/entitiesState";
import { MetaspriteTile, Palette } from "shared/lib/entities/entitiesTypes";
import MetaspriteCanvasWorker, {
  MetaspriteCanvasResult,
} from "./MetaspriteCanvas.worker";
import { assetURL } from "shared/lib/helpers/assets";
 
interface MetaspriteCanvasProps {
  spriteSheetId: string;
  metaspriteId: string;
  flipX?: boolean;
  palettes?: Palette[];
  previewAsMono?: boolean;
}
 
const worker = new MetaspriteCanvasWorker();
 
export const MetaspriteCanvas = memo(
  ({
    spriteSheetId,
    metaspriteId,
    flipX = false,
    palettes,
    previewAsMono,
  }: MetaspriteCanvasProps) => {
    const [workerId] = useState(Math.random());
    const [tiles, setTiles] = useState<MetaspriteTile[]>([]);
    const [paletteColors, setPaletteColors] =
      useState<[string, string, string, string][] | null>(null);
    const canvasRef = React.useRef<HTMLCanvasElement>(null);
    const spriteSheet = useAppSelector((state) =>
      spriteSheetSelectors.selectById(state, spriteSheetId)
    );
    const metasprite = useAppSelector((state) =>
      metaspriteSelectors.selectById(state, metaspriteId)
    );
    const tilesLookup = useAppSelector((state) =>
      metaspriteTileSelectors.selectEntities(state)
    );
    const width = spriteSheet?.canvasWidth || 0;
    const height = spriteSheet?.canvasHeight || 0;
 
    // Cache metasprite tiles
    useEffect(() => {
      const tiles =
        (metasprite?.tiles
          ?.map((tileId) => tilesLookup[tileId])
          .filter((i) => i) as MetaspriteTile[]) || [];
      setTiles(tiles);
    }, [metasprite, tilesLookup]);
 
    // Cache scene palettes
    useEffect(() => {
      setPaletteColors(palettes ? palettes.map((p) => p.colors) : null);
    }, [palettes]);
 
    const onWorkerComplete = useCallback(
      (e: MessageEvent<MetaspriteCanvasResult>) => {
        Iif (e.data.id === workerId) {
          const offscreenCanvas = document.createElement("canvas");
          const offscreenCtx = offscreenCanvas.getContext("bitmaprenderer");
          Iif (!canvasRef.current || !spriteSheet || !offscreenCtx) {
            return;
          }
          const ctx = canvasRef.current.getContext("2d");
          Iif (!ctx) {
            return;
          }
          offscreenCtx.transferFromImageBitmap(e.data.canvasImage);
          ctx.clearRect(0, 0, width, height);
          ctx.drawImage(offscreenCanvas, 0, 0);
        }
      },
      [height, spriteSheet, width, workerId]
    );
 
    useEffect(() => {
      worker.addEventListener("message", onWorkerComplete);
      return () => {
        worker.removeEventListener("message", onWorkerComplete);
      };
    }, [width, height, onWorkerComplete]);
 
    useEffect(() => {
      Iif (!canvasRef.current || !spriteSheet) {
        return;
      }
      Iif (tiles.length === 0) {
        // eslint-disable-next-line no-self-assign
        canvasRef.current.width = canvasRef.current.width;
        return;
      }
      const ctx = canvasRef.current.getContext("2d");
      Iif (!ctx) {
        return;
      }
      const spriteURL = assetURL("sprites", spriteSheet);
 
      worker.postMessage({
        id: workerId,
        src: spriteURL,
        width,
        height,
        tiles,
        flipX,
        palette: DMG_PALETTE.colors,
        palettes: paletteColors,
        previewAsMono,
      });
    }, [
      canvasRef,
      spriteSheet,
      paletteColors,
      tiles,
      width,
      height,
      flipX,
      workerId,
      previewAsMono,
    ]);
 
    return (
      <canvas
        ref={canvasRef}
        width={width}
        height={height}
        style={{ imageRendering: "pixelated" }}
      />
    );
  }
);