Importance

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Abstract

A circuitry is provided for controlling the display of a window on a display operable to display information as at least one field of a plurality of lines of pixels. First counter circuitry is included which is operable to increment with each of a plurality of selected pixels of a given line. First storage circuitry stores position data representing a first coordinate of a reference pixel in the field, the reference pixel being associated with an area of the field in which the window is to be displayed. First adding circuitry is provided which is operable to add a count corresponding to a current pixel and output from the first counter to the position data in the first register. Second counter circuitry is also provided which is operable to increment with each line of the field. Second storage circuitry stores position data representing a second coordinate of the reference pixel. A count corresponding to the current pixel and output from the second counter is added to the position data in the second register by second adding circuitry. Comparative circuitry compares the output of the first adding circuitry and the output of the second adding circuitry and in response outputs an enable signal when the current pixel is within the area of the field in which the window is to be displayed.

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First Claim