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Method and apparatus for display image rotation

a technology of rotating display monitors and methods, applied in the field of processing systems, can solve the problems of significant performance penalty associated with the necessary calculation-intensive axis transformation of typical image orientation adjustments for rotating display monitors

Inactive Publication Date: 2004-03-23
APPLE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

It would be desirable and therefore an object for the present invention to provide a method and apparatus for rotating computer display images 90 degrees on a display device with little or no transformation calculations. It is another object for the present invention to provide the image rotation for the display device in both clockwise and counter-clockwise directions to support both left-handed and right-handed users. Yet another object for the present invention is to implement such rotation feature without significant system performance penalty.

Problems solved by technology

Unfortunately, typical image orientation adjustments for the rotated display monitor have significant performance penalty associated with their necessary calculation-intensive axis transformations.

Method used

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  • Method and apparatus for display image rotation
  • Method and apparatus for display image rotation
  • Method and apparatus for display image rotation

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Embodiment Construction

Reference will now be made in detail to preferred embodiments of the invention. While the invention will be described in conjunction with the preferred embodiments, it should be understood that they are not intended to limit the invention to these embodiments. On the contrary, the invention is intended to cover alternatives, modifications, and equivalents, which may be included within the spirit and scope of the invention as defined by the appended claims.

Throughout this detailed description numerous details are set forth in order to provide a thorough understanding of the present invention, for example, multiple references are made to specific computer display resolutions and data word bit-widths of communication lines. These specific values are exemplary only. To one skilled in the art, however, it will be appreciated that the present invention may be practiced without such specific details and that a wide range of display resolutions and data-word-bit-width values can be used wit...

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Abstract

A method and an apparatus for rotating images on a computer system is disclosed. The system includes a processor for accessing an image frame buffer using a set of CPU addresses, a memory for storing the frame buffer, a controller for directing the pixel data of the frame buffer to a display device using a set of controller addresses. The two sets of addresses are not necessarily the same. In fact, numerous advantages could be had from manipulating those two sets of addresses resulting in image rotation operations for the display device.

Description

FIELD OF THE INVENTIONThis invention relates generally to a processor-controlled system such as a computer system and, more particularly, but not exclusively, to an electrical arrangement in the system for managing video information for rotating computer display images.BACKGROUND INFORMATIONAmong the many image resolutions for computer displays in the market today, a common resolution for computer displays is 640.times.480. Such resolution for a display refers to a display having an overall screen measuring 640 pixels wide by 480 lines high. In fact, any displays having this horizontal format (i.e., its width being greater than its height) would provide ease and convenience for certain computer operations including showing TV images, operating drawing programs and performing spreadsheet calculations. Nevertheless, displays with a vertical format (i.e., its height being greater than its width) are better suited for certain other operations such as word processing, program coding and ...

Claims

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Application Information

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IPC IPC(8): G06F12/06G09G5/393
CPCG09G5/393G09G2340/0492
Inventor HOWARD, BRIAN D.BAILEY, ROBERT L.
Owner APPLE INC