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1.1 root 1: ;---------------------------Module-Header------------------------------;
2: ; Module Name: bitblt.inc
3: ;
4: ; Copyright (c) 1992 Microsoft Corporation
5: ;-----------------------------------------------------------------------;
6:
7: ;-----------------------------------------------------------------------;
8: ; INCREASE is the flag used to show that the BLT operation will be
9: ; increasing in Y (Y+).
10: ;
11: ; DECREASE is the flag used to show that the BLT operation will be
12: ; decreasing in Y (Y-).
13: ;
14: ; STEPLEFT is the flag used to show that the BLT will be stepping
15: ; left (i.e. start at the right hand corner of the source, stepping
16: ; left, or X-).
17: ;
18: ; STEPRIGHT is the flag used to show that the BLT will be stepping
19: ; right (i.e. start at the left hand corner of the source, stepping
20: ; right, or X+).
21: ;-----------------------------------------------------------------------;
22:
23: INCREASE equ 1 ;Incrementing
24: DECREASE equ -1 ;Decrementing
25: STEPLEFT equ 0 ;Stepping to the left
26: STEPRIGHT equ 1 ;Stepping to the right
27:
28: ;-----------------------------------------------------------------------;
29: ; gl_the_flags
30: ;
31: ; F0_GAG_CHOKE Set if the source and destination are of different
32: ; color formats. When set, some form of color
33: ; conversion will be required.
34: ;
35: ; Once you see what all is involved with color
36: ; conversion, you'll understand why this flag is
37: ; called this.
38: ;
39: ; F0_COLOR_PAT Set if color pattern fetch code will be used. If
40: ; clear, then mono pattern fetch code will be used.
41: ; Mono/color pattern fetch is always based on the
42: ; destination being mono/color (it is the same).
43: ;
44: ; F0_PAT_PRESENT Set if a pattern is involved in the BLT.
45: ;
46: ; F0_SRC_PRESENT Set if a source is involved in the BLT.
47: ;
48: ; F0_SRC_IS_DEV Set if the source is the physical device. Clear if
49: ; the source is a memory bitmap.
50: ;
51: ; F0_SRC_IS_COLOR Set if the source is color, clear if monochrome.
52: ;
53: ; F0_DEST_IS_DEV Set if the destination is the physical device.
54: ; Clear if the destination is a memory bitmap.
55: ;
56: ; F0_DEST_IS_COLOR
57: ; Set if the destination is color, clear if
58: ; monochrome.
59: ;-----------------------------------------------------------------------;
60:
61: F0_GAG_CHOKE equ 10000000b ;Going mono <==> color
62: F0_COLOR_PAT equ 01000000b ;Use color pattern fetch code
63: F0_PAT_PRESENT equ 00100000b ;Pattern is involved in blt
64: F0_SRC_PRESENT equ 00010000b ;Source is involved in blt
65: F0_SRC_IS_DEV equ 00001000b ;Source is the device
66: F0_SRC_IS_COLOR equ 00000100b ;Source is color
67: F0_DEST_IS_DEV equ 00000010b ;Destination is the device
68: F0_DEST_IS_COLOR equ 00000001b ;Destination is color
69:
70: ;-----------------------------------------------------------------------;
71: ; Definitions for fbFetch
72: ;-----------------------------------------------------------------------;
73:
74: FF_NO_LAST_FETCH equ 00000010b ;Final fetch might GP
75: FF_TWO_INIT_FETCHES equ 00000001b ;Two initial fetches needed
76: FF_ONE_INIT_FETCH equ 0 ;One initial fetch needed
77: FF_ONLY_1_DEST_BYTE equ 00000100b ;Only one destination byte
78: FF_ONLY_1_SRC_BYTE equ 00001000b ;Only one source byte
79:
80: ;-----------------------------------------------------------------------;
81: ; MAX_BLT_SIZE is the maximum stack space required for the BITBLT
82: ; code. This is a hard number to compute. It must be based on
83: ; the worst case situation:
84: ;
85: ; worst phase alignment
86: ; worst color conversions
87: ; first byte present
88: ; last byte present
89: ; full inner loop
90: ; jump into the inner loop
91: ;
92: ; and any other factor which could increase the size of the code.
93: ;-----------------------------------------------------------------------;
94:
95: MAX_BLT_SIZE = 400h ;Max stack space a BLT will require
96:
97: ;-----------------------------------------------------------------------;
98: ; The following flags are used in the inner loops to both control
99: ; the EGA read/write enable registers, and the plane loop count.
100: ;
101: ; They are based on a simple relationship of the EGA's Map Mask
102: ; register and Read Map Select Register when used as a three plane
103: ; system:
104: ;
105: ; Map Mask: D3 D2 D1 D0 Read Map: D2 D1 D0
106: ;
107: ; C0 plane 0 0 0 1 0 0 0
108: ; C1 plane 0 0 1 0 0 0 1
109: ; C2 plane 0 1 0 0 0 1 0
110: ;
111: ;
112: ; Note that to convert the map mask into a read mask for the
113: ; same plane only requires a "SHR x,1" instruction. This trick
114: ; would not work if all four planes were used.
115: ;
116: ; In four plane mode, when the above mapping occurs becomes:
117: ;
118: ; C3 plane 1 0 0 0 1 0 0
119: ;
120: ; To map this into the correct read map register of 11b:
121: ;
122: ; cmp mask,100b ;Set 'C' if not C3
123: ; adc mask,-1 ;sub -1 only if C3
124: ;
125: ;
126: ;
127: ; The "loop counter" will consist of a bit shifted left every
128: ; interation of the loop, which will be used as stated above.
129: ; When this bit mask reaches a predetermined value, the loop
130: ; will terminate.
131: ;-----------------------------------------------------------------------;
132:
133: COLOR_OP equ C0_BIT ;Color ops start with C0
134: MONO_OP equ MONO_BIT ;Mono ops start with mono bit
135: PLANE_1 equ 00010001b ;Loop starting bits
136: END_OP equ (C3_BIT+MONO_BIT) SHL 1 ;Loop terminating bits
137:
138: ;-----------------------------------------------------------------------;
139: ; dl_moore_flags
140: ;
141: ; dl_moore_flags pertain to color conversion only. If color
142: ; conversion doesn't apply to the BLT, these flags will not
143: ; be defined.
144: ;
145: ;
146: ; F1_REP_OK When F1_REP_OK is set, then the innerloop code can
147: ; use a REP MOVSx instruction. This will be the
148: ; case if:
149: ;
150: ; a) The source is the EGA and the color compare
151: ; register can be used to do the conversion
152: ; from color to monochrome.
153: ;
154: ; b) The source is monochrome, the background
155: ; color white, and the foreground color black,
156: ; in which case color converison of the source
157: ; would just give the source.
158: ;
159: ; F1_NO_MUNGE Set under the same conditions as "b" above.
160: ;-----------------------------------------------------------------------;
161:
162: F1_REP_OK equ 10000000b ;Using REP is ok (when F0_GAG_CHOKE)
163: F1_NO_MUNGE equ 01000000b ;No mono ==> color conversion table
164:
165: ;-----------------------------------------------------------------------;
166: ; The DEV structure contains all the information taken from the
167: ; PDevices passed in. PDevices are copied to the frame to reduce
168: ; the number of long pointer loads required. Having the data
169: ; contained in the structure allows MOVSW to be used when copying
170: ; the data.
171: ;
172: ; width_bits The number of pixels wide the device is.
173: ;
174: ; height The number of scans high the device is.
175: ;
176: ; width_b The width of a scan in bytes.
177: ;
178: ; lp_bits The pointer to the actual bits of the device.
179: ; It will be adjusted as necessary to point to the
180: ; first byte to be modified by the BLT operation.
181: ;
182: ; dev_flags Device Specific Flags
183: ; IS_DEVICE - This is the physical device
184: ; COLOR_UP - Generate color scan line update
185: ; IS_COLOR - Device is a color device
186: ;
187: ; next_scan Bias to get to the next (previous) scan line.
188: ;-----------------------------------------------------------------------;
189:
190: DEV struc
191: width_bits dw ? ;Width in bits
192: height dw ? ;Height in scans
193: width_b dw ? ;Width in bytes
194: lp_bits dd ? ;Pointer to the bits
195: dev_flags db ? ;Device flags as given above
196: db ? ;Alignment
197: next_scan dd ? ;Index to next scan
198: next_plane dd ? ;Index to next plane
199: DEV ends
200:
201: ; Constants for use in dev_flags field of DEV structure:
202:
203: IS_COLOR equ 00000001b ;Device is color
204: IS_DEVICE equ 00000010b ;Physical Device
205: COLOR_UP equ 00000100b ;Color scan line update
206:
207: ;-----------------------------------------------------------------------;
208: ; The following structure is used to define all the local variables
209: ; we will be accessing. We do this since there are no cmacros for
210: ; flatland and masm386 put scope in.
211: ;-----------------------------------------------------------------------;
212:
213: FRAME struc
214:
215: ; Copys of the passed parameters, so called functions can get them
216:
217: pdsurfDst dd ?
218: DestxOrg dw ?
219: DestyOrg dw ?
220: pdsurfSrc dd ?
221: SrcxOrg dw ?
222: SrcyOrg dw ?
223: xExt dw ?
224: yExt dw ?
225: Rop dd ?
226: lpPBrush dd ?
227: bkColor dd ?
228: TextColor dd ?
229: pptlBrush dd ?
230:
231: ; locals
232:
233: phase_h db ? ;Horizontal phase (rotate count)
234: pat_row db ? ;Current row for patterns [0..7]
235: direction db ? ;Increment/decrement flag
236: the_flags db ?
237: first_fetch db ? ;Number of first fetches needed
238: step_direction db ? ;Direction of move (left right)
239: start_mask dw ? ;Mask for first dest byte
240: last_mask dw ? ;Mask for last dest byte
241: mask_p dw ? ;Horizontal phase mask
242: inner_loop_count dd ? ;# of entire bytes to BLT in innerloop
243: operands dw ? ;Operand string
244: start_fl dd ? ;Start of fetch/logic operation
245: end_fl dd ? ;End of fetch/logic operation
246: end_fls dd ? ;End of fetch/logic/store operation
247: blt_addr dd ? ;BLT address
248: cFetchCode dd ? ;size of the fetch code alone
249: both_colors dw ? ;Foreground and Background colors
250: brush_accel db ? ;Brush accelerator
251: moore_flags db ? ;More flags
252: addr_brush_index dd ? ;Address of brush index in code
253: pNextPlane dd ? ;Address of next plane logic
254:
255: ; variable sized locals
256:
257: ppcBlt db (SIZE PACKEDPELCONV) dup (?);Packed pel conversion data
258: src db (SIZE DEV) dup (?) ;Source device data
259: dest db (SIZE DEV) dup (?) ;Destination device data
260: ajM2C db (NUMBER_PLANES * 2) dup (?) ;Mono ==> color munge table
261: a_brush db (NUMBER_PLANES * SIZE_PATTERN) dup (?) ;Temp brush
262: aulMap dd 16 dup (?) ;Packed pel conversion table
263:
264: FRAME ends
265:
266:
267: if 0
268:
269: ;-----------------------------------------------------------------------;
270: ; Definitions of the bitblt frame for enterframe, useframe, leaveframe
271: ;-----------------------------------------------------------------------;
272:
273:
274: ; Define the frame for bitblt, using PASCAL conventions
275:
276: parm_bitblt struc
277: pdsurfDst dd ? ;Pointer to destination DEVSURF
278: DestxOrg dd ? ;Destination X origin
279: DestyOrg dd ? ;Destination Y origin
280: pdsurfSrc dd ? ;Pointer to optional source DEVSURF
281: SrcxOrg dd ? ;Source X origin
282: SrcyOrg dd ? ;Source Y origin
283: xExt dd ? ;X extent of the blt
284: yExt dd ? ;Y extent of the blt
285: Rop dd ? ;Mix mode
286: lpPBrush dd ? ;Pointer to the brush
287: bkColor dd ? ;Background color for mono==>color blts
288: TextColor dd ? ;Foreground color for mono==>color blts
289: pulXlateVec dd ? ;Color translation vector
290: pptlBrush dd ? ;Pointer to POINTL for brush origin
291: parm_bitblt ends
292:
293:
294: loc_bitblt struc
295: ppcBlt db (SIZE PACKEDPELCONV) dup (?);Packed pel conversion data
296: src db (SIZE DEV) dup (?) ;Source device data
297: dest db (SIZE DEV) dup (?) ;Destination device data
298: ajM2C db (NUMBER_PLANES * 2) dup (?) ;Mono ==> color munge table
299: a_brush db (NUMBER_PLANES * SIZE_PATTERN) dup (?) ;Temp brush
300: aulMap dd 16 dup (?) ;Packed pel conversion table
301:
302:
303: phase_h db ? ;Horizontal phase (rotate count)
304: pat_row db ? ;Current row for patterns [0..7]
305: direction db ? ;Increment/decrement flag
306: the_flags db ?
307: first_fetch db ? ;Number of first fetches needed
308: step_direction db ? ;Direction of move (left right)
309: brush_accel db ? ;Brush accelerator
310: moore_flags db ? ;More flags
311:
312: start_mask dw ? ;Mask for first dest byte
313: last_mask dw ? ;Mask for last dest byte
314: mask_p dw ? ;Horizontal phase mask
315: operands dw ? ;Operand string
316: both_colors dw ? ;Foreground and Background colors
317: dw ? ;Alignment
318:
319: inner_loop_count dd ? ;# of entire bytes to BLT in innerloop
320: start_fl dd ? ;Start of fetch/logic operation
321: end_fl dd ? ;End of fetch/logic operation
322: end_fls dd ? ;End of fetch/logic/store operation
323: blt_addr dd ? ;BLT address
324: cFetchCode dd ? ;size of the fetch code alone
325: addr_brush_index dd ? ;Address of brush index in code
326: pNextPlane dd ? ;Address of next plane logic
327: loc_bitblt ends
328:
329:
330:
331: endif
332:
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