const divs = [];
    for (const box of list) {
      box.y -= adjust;
      divs.push(drawBox(xscale, box));
    }
    divs.push(drawSep(-adjust, posTotal, negTotal));

    const h = (list.length > 0 ?  list[list.length-1].y : 0) + 4*ROW;
    chart.style.height = h+'px';
    chart.replaceChildren(...divs);
  }

  function drawBox(xscale, box) {
    const srcIndex = box.src;
    const src = stacks.Sources[srcIndex];

		x := 3 * i % (dstw - srcw)
		y := 7 * i % (dsth - srch)

		DrawMask(dst, dst.Bounds().Add(image.Pt(x, y)), src, image.Point{}, mask, image.Point{}, op)
	}
}

// The BenchmarkFoo functions exercise a drawFoo fast-path function in draw.go.

func BenchmarkFillOver(b *testing.B) {
	bench(b, color.RGBAModel, nil, nil, Over)
}

func BenchmarkFillSrc(b *testing.B) {
	bench(b, color.RGBAModel, nil, nil, Src)
}