Data transformation and clipping in a graphics display system

Details Data transformation and clipping in a graphics display system Data transformation and clipping in a graphics display system

G - Physics

06

T

375/21

G06T 15/30 (2006.01)

Patent

CA 1264879

ABSTRACT OF THE DISCLOSURE A display processor in a raster graphics display system includes a transformation, clipping and mapping feature which controls the transformation, clipping and mapping of graphics data. A control byte contains 5 bits identified as: M- Window to viewport mapping; P-perspective projection; D-2D/3D mode; T-transformation; and C-clipping. Each bit in the control byte is tested to determine what operations are to be performed on the figure to be drawn. For example, if the D bit is one, indicating a three dimensional figure and the T bit is one, indicating transformation, and the C bit is one, indicating clipping, the P bit determines whether the clipping will be perspective or non-perspective clipping and the M bit determines whether the figure to be drawn is to be mapped to the view port.

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