22     lv_obj_t * canvas = lv_canvas_create(lv_screen_active());  in canvas_create()  local
23     lv_obj_set_size(canvas, 500, 360);  in canvas_create()
27     lv_canvas_set_draw_buf(canvas, draw_buf);  in canvas_create()
29     return canvas;  in canvas_create()
32 static void canvas_destroy(lv_obj_t * canvas)  in canvas_destroy()  argument
34     lv_draw_buf_destroy(lv_canvas_get_draw_buf(canvas));  in canvas_destroy()
35     lv_obj_delete(canvas);  in canvas_destroy()
44     lv_obj_t * canvas = canvas_create();  in test_draw_sin_wave()  local
47     lv_canvas_init_layer(canvas, &layer);  in test_draw_sin_wave()
98     lv_canvas_finish_layer(canvas, &layer);  in test_draw_sin_wave()
104     canvas_destroy(canvas);  in test_draw_sin_wave()