| 摘要 |
A mapping apparatus is disclosed for showing special effects on screen images. It contains: (a) a line address generator for generating a scanning line position data for every scanning line being processed; (b) a pointer array memory for storing a plurality of attribute addresses, each of the attribute addresses, which can be repeated, being arranged to correspond to one of the scanning lines in a sequential manner; (c) an attribute array memory for storing one or more attribute entries, wherein each of the attribute entries is assigned an attribute address and contains attribute data to be associated with one or more of the scanning lines via the attribute address so as to allow special screen effects to be provided; (d) a multiplexer circuitry for multiplexing a scanning line being processed with one of the attribute entries in accordance with the attribute address corresponding to the scanning line being processed; and (e) a memory address generator for receiving output from the multiplexer means and generating a new memory address for every point of the scanning line being processed. This mapping apparatus allows a variety of special effects, such as window shiftings, reduction/enlargement, rotations, 3D effect, to be provided very cost-effectively with a very simple circuitry.
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