Leaked source code of windows server 2003
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;----------------------------Module-Header------------------------------;; Module Name: GENDATA.BLT;; Data definitions for BitBLT.;; Created: In Windows' distant past (c. 1983);; Copyright (c) 1983 - 1987 Microsoft Corporation;; This file is a catchall for data definitions other that code templates; for BitBLT.;; This file is part of a set that makes up the Windows BitBLT function; at driver-level.; 03/06/92 dstseng change bitmask_tbl1/bitmask_tbl2 to private;-----------------------------------------------------------------------;
; The following two bitmask tables are used for fetching; the first and last byte used-bits bitmask.
; public bitmask_tbl1; public _bitmask_tbl1bitmask_tbl1 label byte_bitmask_tbl1 label byte db 11111111b ;Masks for leftmost byte db 01111111b db 00111111b db 00011111b db 00001111b db 00000111b db 00000011b db 00000001b
; public bitmask_tbl2; public _bitmask_tbl2bitmask_tbl2 label byte_bitmask_tbl2 label byte db 10000000b ;Masks for rightmost byte db 11000000b db 11100000b db 11110000b db 11111000b db 11111100b db 11111110b db 11111111b
; phase_tbl1 is used for loading the "used" bits and "saved" bits; bitmasks for cases 1,2,3 where the step direction is left to; right. If it weren't for the case of zero, this could be done; with a simple rotate of 00FF. For cases 4,5,6, a simple rotate; can create the mask needed.
; public phase_tbl1phase_tbl1 label word db 11111111b,00000000b ;Used bits, saved bits db 00000001b,11111110b db 00000011b,11111100b db 00000111b,11111000b db 00001111b,11110000b db 00011111b,11100000b db 00111111b,11000000b db 01111111b,10000000b
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