remove tiny-skia and replace chunk renderer with a GPU-based one

static/haku.js

@@ -160,40 +160,6 @@ canvasStrokeImpl = w.haku_pixmap_stroke;
 
 w.haku_init_logging();
 
-export class Pixmap {
-    #pPixmap = 0;
-
-    constructor(width, height) {
-        this.#pPixmap = allocCheck(w.haku_pixmap_new(width, height));
-        this.width = width;
-        this.height = height;
-    }
-
-    destroy() {
-        w.haku_pixmap_destroy(this.#pPixmap);
-    }
-
-    clear(r, g, b, a) {
-        w.haku_pixmap_clear(this.#pPixmap, r, g, b, a);
-    }
-
-    get ptr() {
-        return this.#pPixmap;
-    }
-
-    getArrayBuffer() {
-        return new Uint8ClampedArray(
-            memory.buffer,
-            w.haku_pixmap_data(this.#pPixmap),
-            this.width * this.height * 4,
-        );
-    }
-
-    getImageData() {
-        return new ImageData(this.getArrayBuffer(), this.width, this.height);
-    }
-}
-
 export const ContKind = {
     Scribble: 0,
     Dotter: 1,