Graphics display system with line buffer control scheme
First Claim
1. A method of blending a plurality of graphics images, each graphics image comprising a plurality of lines of graphics contents, the method comprising:
- synchronizing one of a plurality of line buffers to a first clock;
blending a corresponding line of at least one of the plurality of graphics images with an existing content of said one of the plurality of line buffers until all of the corresponding lines of graphics contents have been blended to generate a corresponding line of blended graphics contents in said one of the plurality of line buffers;
providing the corresponding line of blended graphics contents of said one of the plurality of line buffers to a graphics filter for filtering to generate a filtered graphics image; and
synchronizing said one of the plurality of line buffers to the first clock when its blended graphics contents are no longer used to generate the filtered graphics image.
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Accused Products
Abstract
A graphics integrated circuit chip is used in a set-top box for controlling a television display. The graphics chip processes analog video input, digital video input, a graphics input and an audio input simultaneously. The chip includes a display engine that processes graphics images organized as windows. The system includes plurality of line buffers for receiving the graphics contents. The graphics contents are composited into each of the plurality of line buffers by blending the graphics contents with the existing contents of the line buffer until all of the graphics surfaces for the line have been composited.
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Citations
14 Claims
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1. A method of blending a plurality of graphics images, each graphics image comprising a plurality of lines of graphics contents, the method comprising:
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synchronizing one of a plurality of line buffers to a first clock; blending a corresponding line of at least one of the plurality of graphics images with an existing content of said one of the plurality of line buffers until all of the corresponding lines of graphics contents have been blended to generate a corresponding line of blended graphics contents in said one of the plurality of line buffers; providing the corresponding line of blended graphics contents of said one of the plurality of line buffers to a graphics filter for filtering to generate a filtered graphics image; and synchronizing said one of the plurality of line buffers to the first clock when its blended graphics contents are no longer used to generate the filtered graphics image. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for blending a plurality of graphics images, each graphics image comprising a plurality of lines of graphics contents, the system comprising:
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a synchronizing circuit for synchronizing one of a plurality of line buffers to a first clock; a blending circuit for blending a corresponding line of at least one of the plurality of graphics images with an existing content of said one of the plurality of line buffers until all of the corresponding lines of graphics contents have been blended to generate a corresponding line of blended graphics contents in said one of the plurality of line buffers; a graphics filter for filtering the corresponding line of blended graphics contents of said one of the plurality of line buffers to generate a filtered graphics image; and wherein said one of the plurality of line buffers is synchronized to the first clock when its blended graphics contents are no longer used to generate the filtered graphics image. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification