Method and apparatus for transferring a brush pattern to a desti

Details Method and apparatus for transferring a brush pattern to a desti Method and apparatus for transferring a brush pattern to a desti

1994-12-13

1998-02-10

Nguyen, Phu K.

G06F 1500

Patent

active

057178453

ABSTRACT:
Method and apparatus for transferring a brush pattern of pixels stored in memory to a destination bitmap in memory. The method transfers an entire row of the brush pattern to the scan line of a destination bitmap without checking each byte for the end of the row. Data bytes are fetched from the pixel row a predetermined number of times to transfer the pixel row in one pass. The transfer method preferably uses multiple-byte words on word-aligned boundaries of memory to reduce the number of fetches and writes and the number of memory cycles to execute the transfer. The transfer may include combining the pattern with a bitmap such as a source bitmap or the destination bitmap and transferring the combination to the destination bitmap. To accelerate the transfer process, a compiler is provided to compile, in response to an appropriate function call, run time code that is then immediately executed to transfer the pattern to the destination bitmap.

REFERENCES:
patent: 5548706 (1996-08-01), Koizumi et al.
"Device Driver Adaptation Guide" Microsoft Corporation, 1992; Chapters 1, 2 & 10.

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