A TAXIING PA32 HAD TO BRAKE HARD TO AVOID A DEPARTING HELI AT LGB.

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CLRED TO TAXI TO RWY 25L AT TXWY D (CLRNC). CONTACTED GND ON 133.0 MHZ. I WAS CLRED TO TAXI TO RWY 25L AT TXWY D. I RESPONDED WITH READBACK. I STARTED TO EXIT THE RAMP FROM MY TIEDOWN AND OBSERVED A ROBINSON R22 IMMEDIATELY DEPART FROM MY R TO L. THIS HELI WAS HOLDING FOR DEP ABOUT 300 FT TO THE E OF MY TIEDOWN; ON THE PARALLEL ROADWAY ADJACENT TO THE RWY 25L TXWY (TXWY F). UPON SEEING THE HELI LIFT OFF AND CLB FORWARD TOWARD ME; I IMMEDIATELY BRAKED HARD AND STOPPED BEFORE ENTERING THE ROADWAY OR TXWY. AT NO TIME DID THE GND OR CLRNC CTLR ADVISE ME OF A DEPARTING HELI HAZARD. IF I DIDN'T TAKE IT UPON MYSELF TO IMMEDIATELY STOP TAXIING; WE WOULD HAVE COLLIDED. NOTHING WAS SAID TO ME ABOUT THIS INCIDENT; AS THOUGH NO ONE IN THE TWR NOTICED THE INCIDENT. THE HELI WAS OPERATED BY A TRAINING FBO. I SUSPECT THAT THE HELI WAS CLRED TO TAKE OFF AND THE PLT DIDN'T TAKE THE TIME TO CHK FOR GND CONFLICTS AHEAD. I ALSO SPECULATE THAT THE TWR CTLR FOR RWY 25L AND S HELI DEPS WASN'T TALKING WITH GND CTLRS. THIS ARPT HAS A VERY HIGH RWY INCURSION RATE; AND MAYBE THIS IS SOME OF THE REASON.