公开(公告)号：DE3681030D1

公开(公告)日：1991-09-26

申请号：DE3681030

申请日：1986-06-16

Applicant: IBM

Inventor： DICKINSON BARRY ,  FRIEND DAVID JOHN ,  HOLDEN IAN GRAHAM ,  JACKSON PAUL HENRY ,  PADZIESKI ROBERT JOSEPH

IPC: G06T11/00 ,  G06F3/048 ,  G06F3/14 ,  G06F3/153 ,  G06T3/00 ,  G09G5/14 ,  G06F15/62 ,  G09G1/00

Abstract: In the system, image data are stored as a series of scan pel definition signals. The position and size of selected parts of an image to be displayed on the screen of the display device (12) can be transformed in response to signals received from a keyboard (13), tablet (14) or light pen (15). A control program store of the display device stores control programs for a number of transform operations. The system determines when two or more concurrent transforms of parts of an image would cause those parts to be displayed on common areas of the display screen. A list of the transform is ordered and created and signals which define the ordered list of transforms are sent to the display device. In the cases where image portions would occupy common areas of the display screen, the pel definition signals which relate to the higher priority portion of the image are used to control the final content of the common areas of the image displayed.