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Drawing processor and drawing data compression method

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TLDR
In this article, the problem that sub-pixel information for pixels of a drawing primitive causes an increased mounting load because of increase in data volume was solved by using digital differential analyzer (DDA) processing.
Abstract
PROBLEM TO BE SOLVED: To solve the problem that sub-pixel information for pixels of a drawing primitive causes an increased mounting load because of increase in data volume SOLUTION: A setup processing part 14 performs setup of various parameters to process a stream of the drawing primitive given from a primitive input part 12 by a digital differential analyzer (DDA) The DDA 16 converts the drawing primitive supplied from the setup processing part 14 to pixel data by DDA processing The DDA 16 performs the DDA processing in rectangular pixel assembly units along a scan line, and outputs pixel data of the drawing primitive in rectangular pixel group units A compression encoding part 18 compression-encodes sub-pixel information of each pixel contained in each rectangular pixel group by run length encoding, and outputs it to a FIFO buffer 20 COPYRIGHT: (C)2006,JPO&NCIPI

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