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Microsoft Windows NT Build 511 (DDK SDK) 11-01-1993
;---------------------------Module-Header------------------------------;
; Module Name: bitblt.inc
;
; Copyright (c) 1992 Microsoft Corporation
;-----------------------------------------------------------------------;
;-----------------------------------------------------------------------;
; INCREASE is the flag used to show that the BLT operation will be
; increasing in Y (Y+).
;
; DECREASE is the flag used to show that the BLT operation will be
; decreasing in Y (Y-).
;
; STEPLEFT is the flag used to show that the BLT will be stepping
; left (i.e. start at the right hand corner of the source, stepping
; left, or X-).
;
; STEPRIGHT is the flag used to show that the BLT will be stepping
; right (i.e. start at the left hand corner of the source, stepping
; right, or X+).
;-----------------------------------------------------------------------;
INCREASE equ 1 ;Incrementing
DECREASE equ -1 ;Decrementing
STEPLEFT equ 0 ;Stepping to the left
STEPRIGHT equ 1 ;Stepping to the right
;-----------------------------------------------------------------------;
; gl_the_flags
;
; F0_GAG_CHOKE Set if the source and destination are of different
; color formats. When set, some form of color
; conversion will be required.
;
; Once you see what all is involved with color
; conversion, you'll understand why this flag is
; called this.
;
; F0_COLOR_PAT Set if color pattern fetch code will be used. If
; clear, then mono pattern fetch code will be used.
; Mono/color pattern fetch is always based on the
; destination being mono/color (it is the same).
;
; F0_PAT_PRESENT Set if a pattern is involved in the BLT.
;
; F0_SRC_PRESENT Set if a source is involved in the BLT.
;
; F0_SRC_IS_DEV Set if the source is the physical device. Clear if
; the source is a memory bitmap.
;
; F0_SRC_IS_COLOR Set if the source is color, clear if monochrome.
;
; F0_DEST_IS_DEV Set if the destination is the physical device.
; Clear if the destination is a memory bitmap.
;
; F0_DEST_IS_COLOR
; Set if the destination is color, clear if
; monochrome.
;-----------------------------------------------------------------------;
F0_GAG_CHOKE equ 10000000b ;Going mono <==> color
F0_COLOR_PAT equ 01000000b ;Use color pattern fetch code
F0_PAT_PRESENT equ 00100000b ;Pattern is involved in blt
F0_SRC_PRESENT equ 00010000b ;Source is involved in blt
F0_SRC_IS_DEV equ 00001000b ;Source is the device
F0_SRC_IS_COLOR equ 00000100b ;Source is color
F0_DEST_IS_DEV equ 00000010b ;Destination is the device
F0_DEST_IS_COLOR equ 00000001b ;Destination is color
;-----------------------------------------------------------------------;
; Definitions for fbFetch
;-----------------------------------------------------------------------;
FF_NO_LAST_FETCH equ 00000010b ;Final fetch might GP
FF_TWO_INIT_FETCHES equ 00000001b ;Two initial fetches needed
FF_ONE_INIT_FETCH equ 0 ;One initial fetch needed
FF_ONLY_1_DEST_BYTE equ 00000100b ;Only one destination byte
FF_ONLY_1_SRC_BYTE equ 00001000b ;Only one source byte
;-----------------------------------------------------------------------;
; 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 = 400h ;Max stack space a BLT will require
;-----------------------------------------------------------------------;
; 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 ops start with C0
MONO_OP equ MONO_BIT ;Mono ops start with mono bit
PLANE_1 equ 00010001b ;Loop starting bits
END_OP equ (C3_BIT+MONO_BIT) SHL 1 ;Loop terminating bits
;-----------------------------------------------------------------------;
; 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
;-----------------------------------------------------------------------;
; 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.
;
; dev_flags Device Specific Flags
; IS_DEVICE - This is the physical device
; COLOR_UP - Generate color scan line update
; IS_COLOR - Device is a color device
;
; 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
dev_flags db ? ;Device flags as given above
db ? ;Alignment
next_scan dd ? ;Index to next scan
next_plane dd ? ;Index to next plane
DEV ends
; Constants for use in dev_flags field of DEV structure:
IS_COLOR equ 00000001b ;Device is color
IS_DEVICE equ 00000010b ;Physical Device
COLOR_UP equ 00000100b ;Color scan line update
;-----------------------------------------------------------------------;
; The following structure is used to define all the local variables
; we will be accessing. We do this since there are no cmacros for
; flatland and masm386 put scope in.
;-----------------------------------------------------------------------;
FRAME struc
; Copys of the passed parameters, so called functions can get them
pdsurfDst dd ?
DestxOrg dw ?
DestyOrg dw ?
pdsurfSrc dd ?
SrcxOrg dw ?
SrcyOrg dw ?
xExt dw ?
yExt dw ?
Rop dd ?
lpPBrush dd ?
bkColor dd ?
TextColor dd ?
pptlBrush dd ?
; locals
phase_h db ? ;Horizontal phase (rotate count)
pat_row db ? ;Current row for patterns [0..7]
direction db ? ;Increment/decrement flag
the_flags db ?
first_fetch db ? ;Number of first fetches needed
step_direction db ? ;Direction of move (left right)
start_mask dw ? ;Mask for first dest byte
last_mask dw ? ;Mask for last dest byte
mask_p dw ? ;Horizontal phase mask
inner_loop_count dd ? ;# of entire bytes to BLT in innerloop
operands dw ? ;Operand string
start_fl dd ? ;Start of fetch/logic operation
end_fl dd ? ;End of fetch/logic operation
end_fls dd ? ;End of fetch/logic/store operation
blt_addr dd ? ;BLT address
cFetchCode dd ? ;size of the fetch code alone
both_colors dw ? ;Foreground and Background colors
brush_accel db ? ;Brush accelerator
moore_flags db ? ;More flags
addr_brush_index dd ? ;Address of brush index in code
pNextPlane dd ? ;Address of next plane logic
; variable sized locals
ppcBlt db (SIZE PACKEDPELCONV) dup (?);Packed pel conversion data
src db (SIZE DEV) dup (?) ;Source device data
dest db (SIZE DEV) dup (?) ;Destination device data
ajM2C db (NUMBER_PLANES * 2) dup (?) ;Mono ==> color munge table
a_brush db (NUMBER_PLANES * SIZE_PATTERN) dup (?) ;Temp brush
aulMap dd 16 dup (?) ;Packed pel conversion table
FRAME ends
if 0
;-----------------------------------------------------------------------;
; Definitions of the bitblt frame for enterframe, useframe, leaveframe
;-----------------------------------------------------------------------;
; Define the frame for bitblt, using PASCAL conventions
parm_bitblt struc
pdsurfDst dd ? ;Pointer to destination DEVSURF
DestxOrg dd ? ;Destination X origin
DestyOrg dd ? ;Destination Y origin
pdsurfSrc dd ? ;Pointer to optional source DEVSURF
SrcxOrg dd ? ;Source X origin
SrcyOrg dd ? ;Source Y origin
xExt dd ? ;X extent of the blt
yExt dd ? ;Y extent of the blt
Rop dd ? ;Mix mode
lpPBrush dd ? ;Pointer to the brush
bkColor dd ? ;Background color for mono==>color blts
TextColor dd ? ;Foreground color for mono==>color blts
pulXlateVec dd ? ;Color translation vector
pptlBrush dd ? ;Pointer to POINTL for brush origin
parm_bitblt ends
loc_bitblt struc
ppcBlt db (SIZE PACKEDPELCONV) dup (?);Packed pel conversion data
src db (SIZE DEV) dup (?) ;Source device data
dest db (SIZE DEV) dup (?) ;Destination device data
ajM2C db (NUMBER_PLANES * 2) dup (?) ;Mono ==> color munge table
a_brush db (NUMBER_PLANES * SIZE_PATTERN) dup (?) ;Temp brush
aulMap dd 16 dup (?) ;Packed pel conversion table
phase_h db ? ;Horizontal phase (rotate count)
pat_row db ? ;Current row for patterns [0..7]
direction db ? ;Increment/decrement flag
the_flags db ?
first_fetch db ? ;Number of first fetches needed
step_direction db ? ;Direction of move (left right)
brush_accel db ? ;Brush accelerator
moore_flags db ? ;More flags
start_mask dw ? ;Mask for first dest byte
last_mask dw ? ;Mask for last dest byte
mask_p dw ? ;Horizontal phase mask
operands dw ? ;Operand string
both_colors dw ? ;Foreground and Background colors
dw ? ;Alignment
inner_loop_count dd ? ;# of entire bytes to BLT in innerloop
start_fl dd ? ;Start of fetch/logic operation
end_fl dd ? ;End of fetch/logic operation
end_fls dd ? ;End of fetch/logic/store operation
blt_addr dd ? ;BLT address
cFetchCode dd ? ;size of the fetch code alone
addr_brush_index dd ? ;Address of brush index in code
pNextPlane dd ? ;Address of next plane logic
loc_bitblt ends
endif
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