| 摘要 |
PURPOSE:To reduce circuit scale and to execute processing at high speed by providing a memory for drawing to store the contour of a graphic and one part to be painted out and a work memory to store a part remained from the painting-out, drawing the whole contour and after that completing the painting-out of the graphic with referring to the respective memories. CONSTITUTION:The two memories of a memory 2 for drawing and a work memory 3 are provided and the contour of the graphic is drawn to the memory 2 for drawing. Simultaneously, one side bit of the contour is inverted in a range not to exceed a word, namely, the painting-out is executed. On the other hand, concerning a part exceeding the word, it is regarded that there is the part remained from the painting-out. Then, such a part is stored to the separate work memory 3 and the inversion of data is executed for the unit of word by an inverting means 13, which is a rear step circuit, with referring to this separate memory. Then, the painting-out is completed. Thus, special preprocessing is not needed in the case of the painting-out and the graphic can be easily painted out at high speed. Then, the circuit scale can be reduced. |
