Leaked source code of windows server 2003
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
|
|
;----------------------------Module-Header------------------------------;; Module Name: DEVCONST.BLT;; Device-specific constants.;; Created: In Windows' distant past (c. 1983);; Copyright (c) 1983 - 1987 Microsoft Corporation;; This file is part of a set that makes up the Windows BitBLT function; at driver-level.;-----------------------------------------------------------------------;
; MAX_BLT_SIZE is the maximum stack space required for the BITBLT; code. This is a hard number to compute. It must be based on; the worst case situation:;; worst phase alignment; worst color conversions; first byte present; last byte present; full inner loop; jump into the inner loop;; and any other factor which could increase the size of the code.
MAX_BLT_SIZE = 452 ;Max stack space a BLT will require
ifdef GEN_COLOR_BLT; The following flags are used in the inner loops to both control; the EGA read/write enable registers, and the plane loop count.;; They are based on a simple relationship of the EGA's Map Mask; register and Read Map Select Register when used as a three plane; system:;; Map Mask: D3 D2 D1 D0 Read Map: D2 D1 D0;; C0 plane 0 0 0 1 0 0 0; C1 plane 0 0 1 0 0 0 1; C2 plane 0 1 0 0 0 1 0;;; Note that to convert the map mask into a read mask for the; same plane only requires a "SHR x,1" instruction. This trick; would not work if all four planes were used.;; In four plane mode, when the above mapping occurs becomes:;; C3 plane 1 0 0 0 1 0 0;; To map this into the correct read map register of 11b:;; cmp mask,100b ;Set 'C' if not C3; adc mask,-1 ;sub -1 only if C3;;;; The "loop counter" will consist of a bit shifted left every; interation of the loop, which will be used as stated above.; When this bit mask reaches a predetermined value, the loop; will terminate.
COLOR_OP equ C0_BIT ;Color operations start with C0MONO_OP equ MONO_BIT ;Mono operations start with mono bit
ifdef FOUR_PLANEEND_OP equ (C3_BIT+MONO_BIT) SHL 1 ;Loop terminating bitselseEND_OP equ (C2_BIT+MONO_BIT) SHL 1 ;Loop terminating bitsendif
; dl_moore_flags;; dl_moore_flags pertain to color conversion only. If color; conversion doesn't apply to the BLT, these flags will not; be defined.;;; F1_REP_OK When F1_REP_OK is set, then the innerloop code can; use a REP MOVSx instruction. This will be the; case if:;; a) The source is the EGA and the color compare; register can be used to do the conversion; from color to monochrome.;; b) The source is monochrome, the background; color white, and the foreground color black,; in which case color converison of the source; would just give the source.;; F1_NO_MUNGE Set under the same conditions as "b" above.
F1_REP_OK equ 10000000b ;Using REP is ok (when F0_GAG_CHOKE)F1_NO_MUNGE equ 01000000b ;No mono ==> color conversion table; equ 00100000b; equ 00010000b; equ 00001000b; equ 00000100b; equ 00000010b; equ 00000001b
endif ;GEN_COLOR_BLT
page
; The DEV structure contains all the information taken from the; PDevices passed in. PDevices are copied to the frame to reduce; the number of long pointer loads required. Having the data; contained in the structure allows MOVSW to be used when copying; the data.;; width_bits The number of pixels wide the device is.;; height The number of scans high the device is.;; width_b The width of a scan in bytes.;; lp_bits The pointer to the actual bits of the device.; It will be adjusted as necessary to point to the; first byte to be modified by the BLT operation.;; plane_w Width of one plane of data. Only used if the; device is a small color bitmap.;; seg_index Index to get to the next segment of the bitmap.; Only defined if the bitmap is a huge bitmap.;; scans_seg Number of scan lines per 64K segment. Only; defined if the bitmap is a huge bitmap.;; fill_bytes Number of unused bytes per 64K segment. Only; defined if the bitmap is a huge bitmap.;; dev_flags Device Specific Flags; SPANS_SEG - BLT will span 64K segment of the device; IS_DEVICE - This is the physical device; COLOR_UP - Generate color scan line update; IS_COLOR - Device is a color device;; comp_test JC or JNC opcode, used in the huge bitmap scan line; update code. This opcode is based on whether the; BLT is Y+, or Y-.;; comp_value Range of addresses to compare the offset against; to determine if overflow occured. comp_test is the; conditional jump to use for no overflow after doing; a compare with the offset register and this value.;; next_scan Bias to get to the next (previous) scan line.
DEV struc
width_bits dw ? ;Width in bits height dw ? ;Height in scans width_b dw ? ;Width in bytes lp_bits dd ? ;Pointer to the bits plane_w dw ? ;Increment to next plane seg_index dw ? ;Index to next segment if huge bitmap scans_seg dw ? ;Scans per segment if huge fill_bytes dw ? ;Filler bytes per segment if huge dev_flags db ? ;Device flags as given above comp_test db ? ;JC or JNC opcode comp_value dw ? ;Huge bitmap overflow range next_scan dw ? ;Index to next scan
DEV ends
; Constants for use in dev_flags field of DEV structure:
IS_COLOR equ 00000001b ;Device is colorIS_DEVICE equ 00000010b ;Physical DeviceCOLOR_UP equ 00000100b ;Color scan line updateSPANS_SEG equ 10000000b ;BLT spans a segment boundary
OFF_LP_BITS equ wptr lp_bits ;Offset portion of lp_bitsSEG_LP_BITS equ wptr lp_bits+2 ;Segment portion of lp_bits
|
