公开(公告)号：BR9304391A

公开(公告)日：1994-05-24

申请号：BR9304391

申请日：1993-10-29

Applicant: IBM

Inventor： CHEN INCHING ,  HORVATH THOMAS A ,  LEAN ANDY G ,  LIANG BOB C

IPC: G09G5/00 ,  G09G5/393 ,  G06F15/62

Abstract: The present invention provides an integrated display system for multi-media workstations wherein graphics image and video data are merged in a single frame buffer. The integrated display system employs 3-port VRAMs with a first serial access port for display data output, and a random access port for graphics data, a second serial access for video data input. The display system includes a single frame buffer memory system for a multi-media workstation which operates compatibly with display systems and logic designed for dual frame buffer systems and it uses the 3-port VRAM in combination with a means incorporating improved input locking, video update or refresh, and encoded video data input stream.

公开(公告)号：CA1266722A

公开(公告)日：1990-03-13

申请号：CA532247

申请日：1987-03-17

Applicant: IBM

Inventor： LIANG BOB C ,  GONZALEZ-LOPEZ JORGE

IPC: G06F3/153 ,  G06F17/17 ,  G06T15/80 ,  G06F15/72

Abstract: INTERPOLATED DISPLAY CHARACTERISTIC VALUE GENERATOR Method and apparatus for providing interpolated display characteristic values, such as intensity or Z value, for pels within a polygon to be displayed by a computer graphics display system. A scanning sequence generates pel addresses such that each pel address so generated is contiguous with a previously generated pel address. The parametric value rate of change in both the X and the Y direction is determined, and expressed as an integer value and a remainder quantity. The remainder quantity is used to determine a sequence, driven by pel address changes, by which the integer parametric value increment from pel to pel is incremented or decremeted by one in a regular sequence that assures that the error in the computed parametric value for each pel never exceeds 0.5 parametric value units.