| 摘要 |
PURPOSE:To speed up a drawing processing by altering all data of one pixel through a single reading, updating, and writing processing CONSTITUTION:An arithmetic unit 30 sequentially calculates a pixel address of information specifying an address of a display memory 13 and a pixel position in display data of one word in the display memory 13, reads the display data of the one word in the display memory 13 the address information in the calculated pixel address of the display memory 13, performs the drawing logical calculation of only the bit of a specific pixel of the display data with information specifying plural bit positions corresponding to a specific pixel position generated by decoding the display data on the basis of the pixel position specification information in the pixel address, and writes the logical arithmetic result in the display memory 13 again. Then the display data read out of the display memory 13 by a graphic processor are made into a video signal by a display conversion device 40 and displayed on a display device 50. |
