atomisp_css_shading_table_alloc
shading_table = atomisp_css_shading_table_alloc(1, 1);
shading_table = atomisp_css_shading_table_alloc(st->width, st->height);
shading_table = atomisp_css_shading_table_alloc(
struct ia_css_shading_table *atomisp_css_shading_table_alloc(