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how one componet has many handles

Hi, I recently has a problem like this.

dec--scale---------   mosaic--display

dec--scale----

when the scale has dynamic change the resolution, so mosaic must be change configure, so I let the mosaic to have two handle, said handle0, and handle1.

first, handle0 have to alloc the memory, when dynamic change , how I do?

Can anyone can give a advice.