| 摘要 |
<p>PURPOSE:To draw graphics in a multiwindow system at a high speed. CONSTITUTION:A multiwindow system includes a VRAM10 which can set the windows 14, 16 and 18, a control means which controls the visible areas 16, 18, 28, 30, 32 and 34 of the windows 14, 16 and 18, a CRT which displays the image of the VRAM10, a drawing means which copies at least a part of the image of the VRAM10 to a work RAM12 and then draws a graphic 22, and a copying means which copies only the necessary areas 28a, 30a, 32a and 34a out of the graphics of the RAM 12.</p> |
