static void do_draw(sk_canvas_t* canvas) {
sk_paint_t* paint = sk_paint_new();
sk_paint_set_antialias(paint, true);
sk_paint_set_color(paint, 0xFFFFFFFF);
sk_canvas_draw_paint(canvas, paint);
sk_rect_t r = { 10, 10, W - 10, H - 10 };
sk_paint_set_color(paint, 0xFFFF0000);
sk_canvas_draw_rect(canvas, &r, paint);
sk_shader_t* shader = make_shader();
sk_paint_set_shader(paint, shader);
sk_shader_unref(shader);
sk_canvas_draw_oval(canvas, &r, paint);
sk_paint_delete(paint);
}
void draw(sk_canvas_t* canvas) {
sk_paint_t* fill = sk_paint_new();
sk_paint_set_color(fill, sk_color_set_argb(0xFF, 0x00, 0x00, 0xFF));
sk_canvas_draw_paint(canvas, fill);
sk_paint_set_color(fill, sk_color_set_argb(0xFF, 0x00, 0xFF, 0xFF));
sk_rect_t rect;
rect.left = 100.0f;
rect.top = 100.0f;
rect.right = 540.0f;
rect.bottom = 380.0f;
sk_canvas_draw_rect(canvas, &rect, fill);
sk_paint_t* stroke = sk_paint_new();
sk_paint_set_color(stroke, sk_color_set_argb(0xFF, 0xFF, 0x00, 0x00));
sk_paint_set_antialias(stroke, true);
sk_paint_set_stroke(stroke, true);
sk_paint_set_stroke_width(stroke, 5.0f);
sk_path_t* path = sk_path_new();
sk_path_move_to(path, 50.0f, 50.0f);
sk_path_line_to(path, 590.0f, 50.0f);
sk_path_cubic_to(path, -490.0f, 50.0f, 1130.0f, 430.0f, 50.0f, 430.0f);
sk_path_line_to(path, 590.0f, 430.0f);
sk_canvas_draw_path(canvas, path, stroke);
sk_paint_set_color(fill, sk_color_set_argb(0x80, 0x00, 0xFF, 0x00));
sk_rect_t rect2;
rect2.left = 120.0f;
rect2.top = 120.0f;
rect2.right = 520.0f;
rect2.bottom = 360.0f;
sk_canvas_draw_oval(canvas, &rect2, fill);
sk_path_delete(path);
sk_paint_delete(stroke);
sk_paint_delete(fill);
}