fn render_color_image_to_canvas(&self, image: &ColorImage) -> Result<(), &'static str>;

fn render_binary_image_to_canvas(&self, image: &BinaryImage) -> Result<(), &'static str> {

let image = &image.to_color_image();

self.render_color_image_to_canvas(image)

}

fn render_bounding_rect_to_canvas_with_color(&self, rect: &BoundingRect, color: Color);

fn render_point_i32_to_canvas(&self, point: PointI32) {

self.render_point_i32_to_canvas_with_size_color(point, 4, Color::new(255, 0, 0))

}

fn render_point_i32_to_canvas_with_size_color(&self, point: PointI32, size: usize, color: Color) {

let rect = &BoundingRect::new_x_y_w_h(point.x - (size>>1) as i32, point.y - (size>>1) as i32, size as i32, size as i32);

self.render_bounding_rect_to_canvas_with_color(rect, color)

}

fn render_bounding_rect_to_canvas(&self, rect: &BoundingRect) {

self.render_bounding_rect_to_canvas_with_color(rect, Color::new(255, 0, 0));

}

fn log(&self, msg: &str);

fn render_color_image_to_canvas(&self, _image: &ColorImage) -> Result<(), &'static str> { Ok(()) }

fn render_binary_image_to_canvas(&self, _image: &BinaryImage) -> Result<(), &'static str> { Ok(()) }

fn render_bounding_rect_to_canvas_with_color(&self, _rect: &BoundingRect, _color: Color) { }

fn log(&self, msg: &str) { log::info!("{}", msg); }