Bitmap block transfer image conversion

Details Bitmap block transfer image conversion Bitmap block transfer image conversion

1994-12-13

1997-07-01

Tung, Kee M.

Computer graphics processing and selective visual display system

Display driving control circuitry

Controlling the condition of display elements

345189, G06F 1300

Patent

active

056447582

ABSTRACT:
The speed of bitmap block transfers involving image transformations between source and destination bitmaps is increased by forming a mapping array with entries corresponding one-to-one to elements of destination bitmap scan lines. A preprocessor fills the entries of the mapping array with indices of elements in a source scan line that map according to the image transformation to the elements of a destination scan line that correspond with the array entries. A block transfer compiler can then generate code to perform the transfer which uses the mapping array in an indexed look-up operation to determine the source element to transfer to each element of each scan line of the destination bitmap.

REFERENCES:
patent: 4933878 (1990-06-01), Guttag et al.
patent: 5532716 (1996-07-01), Sano
Programming Quickies "Fast Line-Drawing Technique" by Mike Higgins, pp. 414-416.
"Device Driver Adaption Guide" Microsoft Corporation, 1992; Chapters 1, 2 & 10.

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