公开(公告)号：DE69311700T2

公开(公告)日：1998-01-08

申请号：DE69311700

申请日：1993-01-13

Applicant: COMPAQ COMPUTER CORP

Inventor： ALBERS THOMAS ,  EBERST JOHN ,  FONTENOT DARWIN ,  PYRA RICHARD L ,  WELKER MARK ,  WOOD PAUL ,  BRESENHAM JACK

IPC: G09G5/20 ,  G06T11/20

Abstract: Circuitry for drawing lines includes a video memory for storing pixel data and circuitry for generating a sequence of addresses defining a line of pixels in the video memory. A first memory stores a sequence of pattern units corresponding to the generated sequence of addresses. A second memory stores a value indicating a current pattern unit. Writing circuitry writes to the video memory at a generated address responsive to a current pattern unit. A third memory stores a control value which is accessed by update circuitry for updating the second memory to indicate the next pattern unit. The update circuitry may selectively update the second memory to the sequential pattern unit or reset the second memory to a predetermined pattern unit.

公开(公告)号：DE69302263D1

公开(公告)日：1996-05-23

申请号：DE69302263

申请日：1993-01-13

Applicant: COMPAQ COMPUTER CORP

Inventor： ALBERS THOMAS ,  EBERST JOHN ,  FONTENOT DARWIN ,  PYRA RICHARD L ,  WELKER MARK ,  WOOD PAUL ,  BRESENHAM JACK

IPC: G09G5/20 ,  G06T11/20

Abstract: Line draw circuitry receives parameters defining first and second endpoints of a line and calculates line parameters based on the first and second endpoints. The line parameters are then stored in a memory. A "calculate-only" control signals determines whether a line is drawn immediately after calculation (and storing) of the end parameters or whether the line is drawn responsive to a subsequent "start" signal. If the line is to be drawn responsive to the start signal, the line parameters may be modified prior to drawing the line.

公开(公告)号：DE69311700D1

公开(公告)日：1997-07-24

申请号：DE69311700

申请日：1993-01-13

Applicant: COMPAQ COMPUTER CORP

Inventor： ALBERS THOMAS ,  EBERST JOHN ,  FONTENOT DARWIN ,  PYRA RICHARD L ,  WELKER MARK ,  WOOD PAUL ,  BRESENHAM JACK

IPC: G09G5/20 ,  G06T11/20

Abstract: Circuitry for drawing lines includes a video memory for storing pixel data and circuitry for generating a sequence of addresses defining a line of pixels in the video memory. A first memory stores a sequence of pattern units corresponding to the generated sequence of addresses. A second memory stores a value indicating a current pattern unit. Writing circuitry writes to the video memory at a generated address responsive to a current pattern unit. A third memory stores a control value which is accessed by update circuitry for updating the second memory to indicate the next pattern unit. The update circuitry may selectively update the second memory to the sequential pattern unit or reset the second memory to a predetermined pattern unit.

公开(公告)号：DE69302263T2

公开(公告)日：1996-10-31

申请号：DE69302263

申请日：1993-01-13

Applicant: COMPAQ COMPUTER CORP

Inventor： ALBERS THOMAS ,  EBERST JOHN ,  FONTENOT DARWIN ,  PYRA RICHARD L ,  WELKER MARK ,  WOOD PAUL ,  BRESENHAM JACK

IPC: G09G5/20 ,  G06T11/20

Abstract: Line draw circuitry receives parameters defining first and second endpoints of a line and calculates line parameters based on the first and second endpoints. The line parameters are then stored in a memory. A "calculate-only" control signals determines whether a line is drawn immediately after calculation (and storing) of the end parameters or whether the line is drawn responsive to a subsequent "start" signal. If the line is to be drawn responsive to the start signal, the line parameters may be modified prior to drawing the line.