Overlay control circuit and method
First Claim
Patent Images
1. A graphics controller for providing main image data and overlay image data to a display device, comprising:
- a memory for storing the main image data and the overlay image data;
an indicating circuit for producing an indicating signal that, in an active state, indicates that a particular location in the display device is to be represented by the overlay image data; and
an overlay control circuit for fetching the main image data from said memory and being adapted to respond to a transition in said indicating signal to said active state by halting said fetching.
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Abstract
An overlay control circuit and method. In a preferred embodiment of the invention, a graphics controller provides main image data and overlay image data to a display device and includes a memory for storing the main image data and the overlay image data and a logic circuit for producing a signal that, in an active state, indicates that a particular location in the display device is to be represented by the overlay image data. The overlay control circuit fetches the main image data from the memory and is further adapted to respond to a transition in the indicating signal to the active state by halting the fetching.
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Citations
36 Claims
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1. A graphics controller for providing main image data and overlay image data to a display device, comprising:
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a memory for storing the main image data and the overlay image data;
an indicating circuit for producing an indicating signal that, in an active state, indicates that a particular location in the display device is to be represented by the overlay image data; and
an overlay control circuit for fetching the main image data from said memory and being adapted to respond to a transition in said indicating signal to said active state by halting said fetching. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for providing main image data and overlay image data to a display device, comprising:
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a first step of indicating that a particular location in the display device is to be represented by the overlay image data;
fetching the main image data from a memory; and
responding to said first step of indicating by stopping said fetching. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A medium readable by a machine embodying a program of instructions executable by the machine to perform a method for providing main image data and overlay image data to a display device, the method comprising:
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a first step of indicating that a particular location in the display device is to be represented by the overlay image data;
fetching the main image data from a memory; and
responding to said first step of indicating by stopping said fetching. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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28. A system for displaying main image data and overlay image data, comprising:
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a host for providing main and overlay image data;
a graphics display device for receiving the main and overlay image data; and
a graphics controller for controlling the flow of the main and overlay image data from the host to the graphics display device, comprising;
a memory for storing the main image data and the overlay image data;
an indicating circuit for producing an indicating signal that, in an active state, indicates that a particular location in the display device is to be represented by the overlay image data; and
an overlay control circuit for fetching the main image data from said memory and being adapted to respond to a transition in said indicating signal to said active state by halting said fetching. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36)
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Specification