feat: image draw editor support

ts/src/browser.ts

@@ -455,17 +455,12 @@ const Image2DEditor: m.Component<{ si: number; ei: number; el: MonoDisplay.MonoF
   drawing: false,
   drawValue: 1,
 
-  oncreate({ dom }) {
-    const canvas = dom as HTMLCanvasElement;
-    const el = (canvas as any)._el as MonoDisplay.MonoFormatImage2D;
-    drawImage2DCanvas(canvas, el.image);
-  },
-
-  onupdate({ dom, attrs }) {
-    drawImage2DCanvas(dom as HTMLCanvasElement, attrs.el.image);
-  },
-
   view({ attrs: { si, ei, el }, state }) {
+    if (!el.image) {
+      const w = (el as any).width  || W;
+      const h = (el as any).height || H;
+      el.image = { pixels: new Uint8Array(w * h), width: w, height: h };
+    }
     const img = el.image;
 
     function pixelFromEvent(e: MouseEvent): { x: number; y: number } | null {