EP0071725A2
Expired / Lapsed
EP
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Method for scrolling text and graphic data in selected windows of a graphic display
Assignee: International Business Machines Corp
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Filing: 1982-06-23
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Granted: —
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Expires: 2002-06-23
Abstract
Abstract The method for scrolling graphic and text within a selected window of a display (51, 52) under control of processor (20), consists in specifying the pixel locations of opposite corners of a window to be scrolled and the number of rows to be scrolled, calculating the size and location in the display refresh buffer of the window to be scrolled, and moving the number of rows to be scrolled from source locations to destination locations within the window in the display refresh buffer (34).
Inventors
- 👤 David John Bradley
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 03:52
CPC Classifications
G; G09; G09G; G09G5/00; G09G5/34; G09G5/14
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
93 words
A method for scrolling, within a selected window of a display screen, graphic and graphic encoded text data prestored in rows of a display refresh buffer of a raster scan all-points-addressable video display operable in a graphics mode; method being characterized by the steps of: specifying opposite corners of the window and the number of rows to be scrolled; calculating the size and location of the window to be scrolled; and moving rows bounded by said window within said window in said display refresh buffer from a source location to a destination location.
Claim 2
Independent Claim
93 words
A method for scrolling, within a selected window of a display screen, graphic and graphic encoded text data prestored in rows of a display refresh buffer of a raster scan all-points-addressable video display operable in a graphics mode; method being characterized by the steps of: specifying opposite corners of the window and the number of rows to be scrolled; calculating the size and location of the window to be scrolled; and moving rows bounded by said window within said window in said display refresh buffer from a source location to a destination location.
Claim 3
Dependent Claim
162 words
The method according to claim 1 consisting in : determining the number of rows and columns in said window and the location of said window; establishing a destination pointer addressing the row corresponding to a first corner of said window; establishing a source pointer addressing a row offset from the row corresponding to said first corner by a selectable number of rows to be scrolled; moving a row of length equal to the number of columns in said window from one location addressed by said source pointer to another location addressed by said destination pointer; modifying the destination pointer and source pointer by one row; and repeating the moving and modifying steps for each of the rows to be scrolled, thereby scrolling selected rows of graphic and/or graphic encoded text data to a new location within said window while leaving a portion of said window available for display of new information and retaining the display of data outside of said window unaltered.
Claim 4
Dependent Claim
26 words
The method according to claim 2, further comprising the step of: blanking the portion of the window from which rows were moved during said moving step.
Claim 5
Dependent Claim
19 words
The method according to claim 3, comprising the step of applying, during the blanking step, a selectable color attribute.
Claim 6
Dependent Claim
116 words
Display control system comprising a processor for referencing a control program store, and a raster scan video display, characterized by: display refresh buffer means for selectively storing rows of graphic and graphic encoded text character data and directly refreshing the raster scan video display; means providing a program that controls operation of said processor; said processor being responsive to a scroll request specifying opposite corners of a window to be scrolled and the number of rows to be scrolled, for calculating the size and location in said display refresh buffer means of said window to be scrolled, and for moving the number of rows to be scrolled from source locations to destination locations within said window.
Claim 7
Dependent Claim
116 words
Display control system comprising a processor for referencing a control program store, and a raster scan video display, characterized by: display refresh buffer means for selectively storing rows of graphic and graphic encoded text character data and directly refreshing the raster scan video display; means providing a program that controls operation of said processor; said processor being responsive to a scroll request specifying opposite corners of a window to be scrolled and the number of rows to be scrolled, for calculating the size and location in said display refresh buffer means of said window to be scrolled, and for moving the number of rows to be scrolled from source locations to destination locations within said window.
References Cited (Backward Citations)
No citation records indexed.
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