| 摘要 |
An input information obtaining portion (102) of a control section (100) obtains requests input from an input device (20) by a user, which requests include a display region moving request to enlarge/reduce or scroll an image displayed on a display device and a request to generate/erase a viewport, change the size of a viewport, or move a viewport. A viewport control portion (104) successively determines the number, arrangement, and size of viewports accordingly. A display region determining portion (106) determines the region of an image to be displayed next in each viewport. A loading portion (108) determines tile images to be newly loaded, and loads the data of the tile images from a hard disk drive (50). A decoding portion (110) decodes the data of tile images used for rendering the image in each viewport. A display image processing portion (114) updates the display region independently for each viewport. |
