extern SR_PRIV struct sr_transform_module transform_nop;
extern SR_PRIV struct sr_transform_module transform_scale;
extern SR_PRIV struct sr_transform_module transform_invert;
extern SR_PRIV struct sr_transform_module transform_nop;
extern SR_PRIV struct sr_transform_module transform_scale;
extern SR_PRIV struct sr_transform_module transform_invert;