using DirectDraw create dual surface. DirectDraw allows users to direct memory operation, support hardware bit block transfers, hardware coverage, reversed the surface, texture mapping and image.

Sample01
........\DBuffer.bpr
........\DBuffer.cpp
........\DBuffer.obj
........\DBuffer.res
........\DBuffer.tds
........\DBuffer.~bpr
........\Unit1.cpp
........\Unit1.dfm
........\Unit1.h
........\Unit1.obj
........\Unit1.~cpp
........\Unit1.~dfm
........\Unit1.~h

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