| 摘要 |
PROBLEM TO BE SOLVED: To execute a plotting processing by multiple clip at a high speed even when plural overlapped clip areas are set. SOLUTION: A multiple clip judging means 25 receives a clip command, and judges whether or not it is a multiple clip. When it is the first clip command, a clip area plotting means 15 plots the inside part of a clip area as '1' in a clip buffer 17, calculates a rectangular area circumscribing the clip area, and when it is the second and later clip command, the clip area plotting means 15 calculates a new rectangular area surrounding the previous clip area and this time clip area. A clip buffer access data controlling part 27 controls the clip area plotting means 15 so that '0' data can be written outside this time clip area inside the new rectangular area, and leaves a part in which the both areas are overlapped as a new clip area. |
