Patent ID: 8175402
Filing Date: 2012-05-08
Classification: G06F,G09G

Abstract:
1. A drawing apparatus comprising: a raster conversion processing module for converting a wiring pattern, which is a vector image, into a bitmap image data; an image cache module for temporarily storing a predetermined-size cached image supplied from the raster conversion processing module; a first compression module for compressing the cached image stored in the image cache module according to Run-Length Encoding (RLE compression) in which a compression unit size is matched to a minimum line width of the wiring pattern; a second compression module for compressing the cached image stored in the image cache module in a compression unit size larger than that of the first compression module with the same RLE compression as the first compression module in use; a comparison module for comparing the data size of compressed data generated by the first compression module and the data size of compressed data generated by the second compression module and selecting one having the smaller data size; a memory access module for writing the compressed data selected by the comparison module, into a storage module; a cache region control module for registering and controlling a type of data indicating a position of a cache region, and indicating white, black or compressed data of the cached image; and an expansion module for confirming the type of data and writing the cached image expanded by the expansion module into the image cache module.