virtual void OnDraw(const Context &context) override {
using wiztk::graphic::Canvas;
using wiztk::graphic::Paint;
const RectF &rect = GetBounds();
int scale = context.surface()->GetScale();
Canvas *canvas = context.canvas();
canvas->Save();
canvas->Scale(scale, scale);
Paint paint;
paint.SetColor(ColorF(0.855f, 0.855f, 0.165f, .9f));
canvas->DrawRect(rect, paint);
canvas->Restore();
SkCanvas *sk_canvas = canvas->GetSkCanvas();
SkImageInfo info = SkImageInfo::MakeN32(400, 400, kPremul_SkAlphaType);
sk_sp<SkSurface> surface = sk_canvas->makeSurface(info);
SkCanvas *top_canvas = surface->getCanvas();
SkRect top_rect = SkRect::MakeXYWH(50, 50, 100, 100);
SkPaint top_paint;
top_paint.setColor(0xFFFF0000);
top_canvas->drawRect(top_rect, top_paint);
top_canvas->flush();
surface->draw(sk_canvas, 100, 100, nullptr);
canvas->Flush();
}
