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1 PAGE ,132 ;AN000;
2 ;AN000;
3 TITLE DOS GRAPHICS Command - Print screen Control module
4;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;AN000;
5;; DOS - GRAPHICS Command
6;; (c) Copyright 1988 Microsoft
7;; ;AN000;
8;; File Name: GRCTRL.ASM ;AN000;
9;; ---------- ;AN000;
10;; ;AN000;
11;; Description: ;AN000;
12;; ------------ ;AN000;
13;; This file contains the code for the Print Screen control module. ;AN000;
14;; ;AN000;
15;; Documentation Reference: ;AN000;
16;; ------------------------ ;AN000;
17;; OASIS High Level Design ;AN000;
18;; OASIS GRAPHICS I1 Overview ;AN000;
19;; ;AN000;
20;; Procedures Contained in This File: ;AN000;
21;; ---------------------------------- ;AN000;
22;; PRT_SCR ;AN000;
23;; DET_HW_CONFIG ;AN000;
24;; DET_MODE_STATE ;AN000;
25;; GET_MODE_ATTR ;AN000;
26;; SET_UP_XLT_TAB ;AN000;
27;; SET_CGA_XLT_TAB ;AN000;
28;; CGA_COL2RGB ;AN000;
29;; RGB2XLT_TAB ;AN000;
30;; SET_EGA_XLT_TAB ;AN000;
31;; EGA_COL2RGB ;AN000;
32;; SET_MODE_F_XLT_TAB ;AN000;
33;; SET_MODE_13H_XLT_TAB ;AN000;
34;; SET_ROUNDUP_XLT_TAB ;AN000;
35;; SET_BACKG_IN_XLT_TAB ;AN000;
36;; RGB2BAND ;AN000;
37;; RGB2INT ;AN000;
38;; ;AN000;
39;; ;AN000;
40;; Include Files Required: ;AN000;
41;; ----------------------- ;AN000;
42;; GRINST.EXT - Externals for GRINST.ASM ;AN000;
43;; ;AN000;
44;; ;AN000;
45;; External Procedure References: ;AN000;
46;; ------------------------------ ;AN000;
47;; FROM FILE GRINST.ASM: ;AN000;
48;; GRAPHICS_INSTALL - Main module for installation. ;AN000;
49;; ;AN000;
50;; Linkage Instructions: ;AN000;
51;; -------------------- ;AN000;
52;; Refer to GRAPHICS.ASM ;AN000;
53;; ;AN000;
54;; Change History: ;AN000;
55;; --------------- ;AN000;
56;; ;AN000;
57;; ;AN000;
58;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;AN000;
59CODE SEGMENT PUBLIC 'CODE' ;AN000;
60 ASSUME CS:CODE,DS:CODE ;AN000;
61 ;AN000;
62.XLIST ;AN000;
63INCLUDE GRINT2FH.EXT ;AN000;
64INCLUDE GRBWPRT.EXT ;AN000;
65INCLUDE GRCOLPRT.EXT ;AN000;
66INCLUDE GRSHAR.STR ;AN000;
67INCLUDE GRPATTRN.STR ;AN000;
68INCLUDE GRPATTRN.EXT ;AN000;
69INCLUDE STRUC.INC ;AN000;
70.LIST ;AN000;
71PRT_SCR PROC NEAR ;AN000;
72 JMP PRT_SCR_BEGIN ;AN000;
73PAGE ;AN000;
74;===============================================================================;AN000;
75; ;AN000;
76; GRAPHICS INTERRUPT DRIVER'S DATA: ;AN000;
77; ;AN000;
78;===============================================================================;AN000;
79.xlist ;AN000;
80PUBLIC PRT_SCR,ERROR_CODE,XLT_TAB,MODE_TYPE ;AN000;
81PUBLIC CUR_MODE_PTR,CUR_MODE,NB_COLORS,SCREEN_HEIGHT,SCREEN_WIDTH ;AN000;
82PUBLIC CUR_PAGE,CUR_COLUMN,CUR_ROW,NB_SCAN_LINES,SCAN_LINE_MAX_LENGTH ;AN000;
83PUBLIC CUR_SCAN_LNE_LENGTH ;AN000;
84PUBLIC PRT_BUF,NB_BOXES_PER_PRT_BUF,CUR_BOX,BOX_H,BOX_W ;AN000;
85PUBLIC PRINT_SCREEN_ALLOWED,RGB ;AN000;
86PUBLIC BIOS_INT_5H ;AN000;
87PUBLIC ROTATE_SW ;AN000;
88PUBLIC DET_HW_CONFIG ;AN000;
89PUBLIC NB_CHAR_COLUMNS ;AN000;
90PUBLIC RGB2INT ;AN000;
91PUBLIC RGB2BAND ;AN000;
92.list ;AN000;
93INCLUDE GRCTRL.STR ;AN000;
94;-------------------------------------------------------------------------------;AN000;
95; ;AN000;
96; ENTRY POINT TO BIOS HARDWARE INTERRUPT 5 HANDLER ;AN000;
97; ;AN000;
98;-------------------------------------------------------------------------------;AN000;
99BIOS_INT_5H DW ? ; Pointer to BIOS int 5h ;AN000;
100 DW ? ;AN000;
101 ;AN000;
102;-------------------------------------------------------------------------------;AN000;
103; ;AN000;
104; PRINT SCREEN ERROR CODE (Used at print screen time, see GRCTRL.STR for ;AN000;
105; error codes allowed) ;AN000;
106; ;AN000;
107;-------------------------------------------------------------------------------;AN000;
108ERROR_CODE DB 0 ; ERROR CODE 0 = NO ERROR ;AN000;
109 ;AN000;
110;-------------------------------------------------------------------------------;AN000;
111; ;AN000;
112; SCREEN PIXEL: INTERNAL REPRESENTATION ;AN000;
113; ;AN000;
114;-------------------------------------------------------------------------------;AN000;
115RGB PIXEL_STR < , , > ; PIXEL := RED, GREEN, BLUE Values ;AN000;
116 ;AN000;
117;-------------------------------------------------------------------------------;AN000;
118; ;AN000;
119; COLOR TRANSLATION TABLE: ;AN000;
120; ;AN000;
121; This table is used to translate the color numbers returned by ;AN000;
122; Interrupt 10H Read Dot and Read Character calls into print ;AN000;
123; information. The table consists of 256 entries, one byte each, ;AN000;
124; indexed by color number. ;AN000;
125; In the case of black and white printing, the table ;AN000;
126; entries are grey scale intensities from 0 to 63. In the case ;AN000;
127; of color printing each table entry contains a "band mask" indicating ;AN000;
128; which color print bands are required to generate the required color. ;AN000;
129; The band masks are simply bit masks where each bit corresponds to one ;AN000;
130; of the printer bands. ;AN000;
131; ;AN000;
132; The table is set up at the beginning of the print screen processing, ;AN000;
133; before any data is read from the screen. From then on, translating ;AN000;
134; from screen information into print information is done quickly by ;AN000;
135; accessing this table. Not all 256 entries are initialized for each ;AN000;
136; screen print. The number of entries used is equal to the number ;AN000;
137; of colors available concurrently with the given display mode. ;AN000;
138;-------------------------------------------------------------------------------;AN000;
139XLT_TAB DB 256 DUP(32) ; COLOR TRANSLATION TABLE ;AN000;
140 ; This table is used to translate the Color Dot ;AN000;
141 ; or Byte Attribute to a Band Mask for color ;AN000;
142 ; printing or to a Grey Intensity for Mono- ;AN000;
143 ; chrome printing. ;AN000;
144 ;AN000;
145;-------------------------------------------------------------------------------;AN000;
146; ;AN000;
147; CURRENT VIDEO MODE ATTRIBUTES ;AN000;
148; ;AN000;
149;-------------------------------------------------------------------------------;AN000;
150MODE_TYPE DB ? ; Mode types (bit mask) APA or TXT ;AN000;
151 ;AN000;
152CUR_MODE_PTR DW ? ; DISPLAYMODE INFO RECORD for the current ;AN000;
153 ; mode (defined in the shared data area). ;AN000;
154CUR_MODE DB ? ; Current video mode number ;AN000;
155NB_COLORS DW ? ; Number of colors supported by this mode ;AN000;
156SCREEN_HEIGHT DW ? ; Number of rows on the screen (chars or pixels);AN000;
157SCREEN_WIDTH DW ? ; Number of columns on the screen (chars/pixels);AN000;
158 ; (for text modes is equal to NB_CHAR_COLUMNS) ;AN000;
159NB_CHAR_COLUMNS DB ? ; Number of columns on the screen if in txt mode;AN000;
160CUR_PAGE DB ? ; Active page number ;AN000;
161ROTATE_SW DB ? ; Switch: if "ON" then, must print sideways ;AN000;
162 ;AN000;
163;-------------------------------------------------------------------------------;AN000;
164; ;AN000;
165; ACTIVE SCREEN ATTRIBUTES ;AN000;
166; ;AN000;
167;-------------------------------------------------------------------------------;AN000;
168CUR_COLUMN DW ? ; Current pixel/char column number ;AN000;
169CUR_ROW DW ? ; Current pixel/char row number ;AN000;
170NB_SCAN_LINES DW ? ; Number of screen scan lines ;AN000;
171SCAN_LINE_MAX_LENGTH DW ? ; Maximum number of dots/chars per scan line ;AN000;
172CUR_SCAN_LNE_LENGTH DW ? ; Length in pels/chars of the current scan line ;AN000;
173 ;AN000;
174;-------------------------------------------------------------------------------;AN000;
175; ;AN000;
176; PRINTER VARIABLES ;AN000;
177; ;AN000;
178;-------------------------------------------------------------------------------;AN000;
179PRT_BUF DB ?,?,?,? ; PRINT BUFFER ;AN000;
180NB_BOXES_PER_PRT_BUF DB ? ; Number of boxes fitting in the print buffer ;AN000;
181CUR_BOX DB ?,?,?,? ; BOX = PRINTER REPRESENTATION OF 1 PIXEL ;AN000;
182BOX_H DB ? ; HEIGHT OF THE BOX ;AN000;
183BOX_W DB ? ; WIDTH OF THE BOX ;AN000;
184 ;AN000;
185;-------------------------------------------------------------------------------;AN000;
186; ;AN000;
187; CONTROL VARIABLES: ;AN000;
188; ;AN000;
189; This data is used to communicate between the Installation Modules ;AN000;
190; and the Resident Print Screen Modules. ;AN000;
191;-------------------------------------------------------------------------------;AN000;
192PRINT_SCREEN_ALLOWED DB YES; Used to avoid print screens ;AN000;
193 ; while the GRAPHICS installation ;AN000;
194 ; (or re-install) is in progress ;AN000;
195 ; Set by GRAPHICS_INSTALL module. ;AN000;
196 ;AN000;
197 ;AN000;
198PAGE ;AN000;
199;===============================================================================;AN000;
200; ;AN000;
201; INTERRUPT 5 DRIVER'S CODE: ;AN000;
202; ;AN000;
203;-------------------------------------------------------------------------------;AN000;
204;===============================================================================;AN000;
205; ;AN000;
206; PRT_SCR : PRINT THE ACTIVE SCREEN ;AN000;
207; ;AN000;
208;-------------------------------------------------------------------------------;AN000;
209; ;AN000;
210; INPUT: SHARED_DATA_AREA_PTR = Offset of the data area used for ;AN000;
211; passing data between the ;AN000;
212; Installation process and the Print ;AN000;
213; Screen process. ;AN000;
214; PRINT_SCREEN_ALLOWED = Switch. Set to "No" if currently ;AN000;
215; installing GRAPHICS.COM ;AN000;
216; ;AN000;
217; NOTE: These 2 variables are declared within ;AN000;
218; PRT_SCR but initialized by the ;AN000;
219; Installation process GRAPHICS_INIT ;AN000;
220; OUTPUT: PRINTER ;AN000;
221; ;AN000;
222; CALLED BY: INTERRUPT 5 ;AN000;
223; ;AN000;
224; ;AN000;
225;-------------------------------------------------------------------------------;AN000;
226; ;AN000;
227; DESCRIPTION: ;AN000;
228; ;AN000;
229; PRINT THE ACTIVE SCREEN for all TEXT and All Points Addressable (APA) ;AN000;
230; display modes available with either a MONO, CGA, EGA, or VGA video ;AN000;
231; adapter on a Black and White or Color printer. ;AN000;
232; ;AN000;
233; INITIALIZATION: ;AN000;
234; ;AN000;
235; Each pixel or character on the screen has a color attribute. These ;AN000;
236; colors must be translated into different internal representations: ;AN000;
237; ;AN000;
238; For printing in colors, each color is translated to a BAND MASK. ;AN000;
239; The Band Mask indicates how to obtain this color on the printer. ;AN000;
240; ;AN000;
241; For printing in Black and White, each color is translated to a ;AN000;
242; GREY INTENSITY number between 0 (black) and 63 (white). ;AN000;
243; ;AN000;
244; The BAND MASK or the GREY INTENSITIES are found in the COLOR ;AN000;
245; TRANSLATION TABLE. This table is initialized before calling any of ;AN000;
246; the print screen modules. ;AN000;
247; ;AN000;
248; PRINT SCREEN TIME: ;AN000;
249; ;AN000;
250; When a pixel or character is read off the screen by one of the print ;AN000;
251; screen modules, its color is used as an index into the translation ;AN000;
252; table. ;AN000;
253; ;AN000;
254; ;AN000;
255; LOGIC: ;AN000;
256; ;AN000;
257; IF SCREEN_PRINTS_ALLOWED=NO ; Block print screens until Installation ;AN000;
258; THEN IRET ; Process (or re-install!) is finished. ;AN000;
259; ELSE ;AN000;
260; ;AN000;
261; CALL DET_HW_CONFIG ; Determine hardware configuration ;AN000;
262; CALL DET_MODE_STATE ; Determine video mode and active page ;AN000;
263; CALL GET_MODE_ATTR ; Get video attributes (TXT or APA, etc) ;AN000;
264; ;AN000;
265; IF MODE_TYPE = TXT AND Number of colors = 0 ;AN000;
266; THEN Invoke BIOS INTERRUPT 5 ;AN000;
267; ELSE ;AN000;
268; IF PRINTER_TYPE = BLACK_WHITE ;AN000;
269; THEN ;AN000;
270; IF MODE_TYPE = TXT ;AN000;
271; THEN Invoke BIOS INTERRUPT 5 ;AN000;
272; ELSE ; Mode is APA ;AN000;
273; CALL SET_UP_XLT_TAB ; Set up the color translation table ;AN000;
274; CALL PRINT_BW_APA ; Print the active screen on a B&W printer ;AN000;
275; ELSE ; Color printer attached ;AN000;
276; CALL SET_UP_XLT_TAB ; Set up the color translation table ;AN000;
277; CALL PRINT_COLOR ; Print the active screen on a Color prt. ;AN000;
278; IRET ;AN000;
279; ;AN000;
280PRT_SCR_BEGIN: ;AN000;
281 PUSH AX ; Save Registers ;AN000;
282 PUSH BX ; ;AN000;
283 PUSH CX ; ;AN000;
284 PUSH DX ; ;AN000;
285 PUSH SI ; ;AN000;
286 PUSH DI ; ;AN000;
287 PUSH BP ; ;AN000;
288 PUSH DS ; ;AN000;
289 PUSH ES ; ;AN000;
290 ; ;AN000;
291 CLD ; Clear direction flag ;AN000;
292 PUSH CS ; DS := CS ;AN000;
293 POP DS ;AN000;
294 ;AN000;
295;-------------------------------------------------------------------------------;AN000;
296; Verify if we are allowed to print (not allowed if currently installing ;AN000;
297; GRAPHICS or printing a screen): ;AN000;
298;-------------------------------------------------------------------------------;AN000;
299 CMP PRINT_SCREEN_ALLOWED,NO ; IF not allowed to print ;AN000;
300 JE PRT_SCR_RETURN ; THEN quit ;AN000;
301 ; ELSE print the screen: ;AN000;
302;-------------------------------------------------------------------------------;AN000;
303; INITIALIZATION: ;AN000;
304;-------------------------------------------------------------------------------;AN000;
305PRT_SCR_INIT: ; Disable print screen while ;AN000;
306 MOV PRINT_SCREEN_ALLOWED,NO ; we are printing the current ;AN000;
307 ; screen. ;AN000;
308 MOV BP,SHARED_DATA_AREA_PTR ; BP := Offset Shared Data Area ;AN000;
309 MOV ERROR_CODE,NO_ERROR ; No error so far. ;AN000;
310 CALL DET_HW_CONFIG ; Determine the type of display adapter ;AN000;
311 CALL DET_MODE_STATE ; Init CUR_PAGE, CUR_MODE ;AN000;
312 CALL GET_MODE_ATTR ; Determine if APA or TXT, nb. of colors, ;AN000;
313 ; and screen dimensions in pels or characters. ;AN000;
314 ; ;AN000;
315 ; Test the error code returned by GET_MODE_ATTR: ;AN000;
316 ; ;AN000;
317 TEST ERROR_CODE,MODE_NOT_SUPPORTED ;If mode not supported then, ;AN000;
318 JNZ EXIT_TO_BIOS ; let BIOS give it a try. ;AN000;
319 ;AN000;
320 ;------------------------------------------------------------------------------;AN000;
321 ; Check the printer type: ;AN000;
322 ;------------------------------------------------------------------------------;AN000;
323 .IF <DS:[BP].PRINTER_TYPE EQ BLACK_WHITE> ; Is a black and white printer ;AN000;
324 .THEN ; attached ? ;AN000;
325 ;------------------------------------------------------------------------------;AN000;
326 ; A Black and White printer is attached ;AN000;
327 ;------------------------------------------------------------------------------;AN000;
328 CMP MODE_TYPE,TXT ; Is the screen in text mode ? ;AN000;
329 JNE INVOKE_PRINT_ROUTINE ; No, call GRAPHICS B&W routine ;AN000;
330 JMP SHORT EXIT_TO_BIOS ; Yes, give control to BIOS INTERRUPT 5 ;AN000;
331 .ELSE ;AN000;
332 ;------------------------------------------------------------------------------;AN000;
333 ; A Color printer is attached ;AN000;
334 ;------------------------------------------------------------------------------;AN000;
335 CMP NB_COLORS,0 ; Is the screen in a Monochrome ;AN000;
336 JNE INVOKE_PRINT_ROUTINE ;AN000;
337 TEST MODE_TYPE,TXT ; text mode ? ;AN000;
338 JNZ INVOKE_PRINT_ROUTINE ;AN000;
339 JMP SHORT EXIT_TO_BIOS ; Yes, let BIOS INTERRUPT 5 handle it ;AN000;
340 ; No, we handle it. ;AN000;
341.ENDIF ; ENDIF black and white or color printer ;AN000;
342;-------------------------------------------------------------------------------;AN000;
343; ;AN000;
344; Call the print routine (which is either PRINT_COLOR or PRINT_BW_APA) ;AN000;
345; ;AN000;
346;-------------------------------------------------------------------------------;AN000;
347INVOKE_PRINT_ROUTINE: ;AN000;
348 CALL SET_UP_XLT_TAB ; Set up the color translation table ;AN000;
349 CALL PRINT_MODULE_START ; Call the print modules that were ;AN000;
350 ; made resident at Install time. ;AN000;
351 MOV PRINT_SCREEN_ALLOWED,YES; Enable PrtScr for next calls ;AN000;
352 ;-----------------------------------------------------------------------------;AN000;
353 ; Test the error code returned by either PRINT_COLOR or PRT_BW_APA ;AN000;
354 ;-----------------------------------------------------------------------------;AN000;
355 TEST ERROR_CODE,UNABLE_TO_PRINT ; If unable to print the screen ;AN000;
356 JNZ SHORT EXIT_TO_BIOS ; then, let BIOS give it a try ;AN000;
357 ;AN000;
358PRT_SCR_RETURN: ;AN000;
359 ; Restore registers ;AN000;
360 POP ES ; ;AN000;
361 POP DS ; ;AN000;
362 POP BP ; ;AN000;
363 POP DI ; ;AN000;
364 POP SI ; ;AN000;
365 POP DX ; ;AN000;
366 POP CX ; ;AN000;
367 POP BX ; ;AN000;
368 POP AX ; ;AN000;
369 ; ;AN000;
370 IRET ; Return control to interrupted ;AN000;
371 ; process ;AN000;
372EXIT_TO_BIOS: ;AN000;
373 ; Restore registers ;AN000;
374 POP ES ; ;AN000;
375 POP DS ; ;AN000;
376 POP BP ; ;AN000;
377 POP DI ; ;AN000;
378 POP SI ; ;AN000;
379 POP DX ; ;AN000;
380 POP CX ; ;AN000;
381 POP BX ; ;AN000;
382 POP AX ; ;AN000;
383 CLI ; Disable interrupts ;AN000;
384 MOV CS:PRINT_SCREEN_ALLOWED,YES ; Enable PrtScr for next calls ;AN000;
385 JMP DWORD PTR CS:BIOS_INT_5H ; Exit to BIOS INTERRUPT 5 ;AN000;
386 ;AN000;
387PRT_SCR ENDP ;AN000;
388 ;AN000;
389 ;AN000;
390;===============================================================================;AN000;
391; ;AN000;
392; PRT_SCR MODULES: ;AN000;
393; ;AN000;
394;-------------------------------------------------------------------------------;AN000;
395PAGE ;AN000;
396;===============================================================================;AN000;
397; ;AN000;
398; DET_HW_CONFIG : DETERMINE WHAT TYPE OF VIDEO HARDWARE IS PRESENT ;AN000;
399; ;AN000;
400;-------------------------------------------------------------------------------;AN000;
401; ;AN000;
402; INPUT: BP = Offset of the shared data area ;AN000;
403; ;AN000;
404; OUTPUT: HARDWARE_CONFIG is updated in the shared data area ;AN000;
405; ;AN000;
406; CALLED BY: PRT_SCR ;AN000;
407; ;AN000;
408; EXTERNAL CALLS: BIOS INT 10H ;AN000;
409; ;AN000;
410;-------------------------------------------------------------------------------;AN000;
411; ;AN000;
412; LOGIC: ;AN000;
413; Issue BIOS INT10H Get Display Configuration Code (AX=1A00H) ;AN000;
414; IF AL = 1AH THEN /* VGA (PS/2 OR BRECON-B) */ ;AN000;
415; /* BL = active DCC */ ;AN000;
416; /* BH = alternate DCC */ ;AN000;
417; /* Display Code: */ ;AN000;
418; /* 1 - Mono Adapter */ ;AN000;
419; /* 2 - CGA */ ;AN000;
420; /* 4 - EGA with Mono Display */ ;AN000;
421; /* 5 - EGA with Color Display */ ;AN000;
422; /* 7 - PS/2 Mod 50,60,80 OR BRECON-B with Mono Display */ ;AN000;
423; /* 8 - PS/2 Mod 50,60,80 OR BRECON-B with Color Display */ ;AN000;
424; /* B - PS/2 Mod 30 with Mono Display */ ;AN000;
425; /* C - PS/2 Mod 30 with Color Display */ ;AN000;
426; IF AL = 1AH THEN /* Call is supported */ ;AN000;
427; Set HARDWARE_CONFIG byte based on DCC returned in DL ;AN000;
428; ELSE ;AN000;
429; Issue INT 10H EGA Info (AH=12H BL=10H) ;AN000;
430; IF BL <> 10H THEN /* EGA */ ;AN000;
431; Set EGA bit in HARDWARE_CONFIG ;AN000;
432; ELSE /* CGA or */ ;AN000;
433; Issue INT 10H PC CONVERTIBLE Physical display description param. ;AN000;
434; request. (AH=15H) ;AN000;
435; IF ES:[DI] = 5140H ;AN000;
436; THEN ;AN000;
437; Set PC_CONVERTIBLE bit in HARDWARE_CONFIG ;AN000;
438; ELSE ;AN000;
439; Set OLD_ADAPTER bit in HARDWARE_CONFIG ;AN000;
440; ENDIF ;AN000;
441; ENDIF ;AN000;
442; ENDIF ;AN000;
443; RETURN ;AN000;
444; ;AN000;
445;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;AN000;
446DET_HW_CONFIG PROC NEAR ;AN000;
447 ;AN000;
448;-------------------------------------------------------------------------------;AN000;
449; ;AN000;
450; Try to read display combination code (PS/2 call): ;AN000;
451; ;AN000;
452;-------------------------------------------------------------------------------;AN000;
453 MOV AX,READ_CONFIG_CALL ;AN000;
454 INT 10H ; Call video BIOS ;AN000;
455 ;AN000;
456 .IF <AL EQ 1AH> ; If call is supported ;AN000;
457 .THEN ;AN000;
458;-------------------------------------------------------------------------------;AN000;
459; ;AN000;
460; Call is supported, PS/2 BIOS is present (Model 39,50,60,80 or BRECON-B card), ;AN000;
461; Determine what is the primary video adapter: ;AN000;
462; ;AN000;
463;-------------------------------------------------------------------------------;AN000;
464 .SELECT ;AN000;
465 .WHEN <BL EQ 1> OR ; MONO or ;AN000;
466 .WHEN <BL EQ 2> ; CGA ;AN000;
467 MOV DS:[BP].HARDWARE_CONFIG,OLD_ADAPTER ;AN000;
468 .WHEN <BL EQ 4> OR ; EGA with Mono or ;AN000;
469 .WHEN <BL EQ 5> ; EGA with Color ;AN000;
470 MOV DS:[BP].HARDWARE_CONFIG,EGA ;AN000;
471 .WHEN <BL EQ 7> OR ; BRECON-B with Mono or ;AN000;
472 .WHEN <BL EQ 8> ; BRECON-B with Color ;AN000;
473 MOV DS:[BP].HARDWARE_CONFIG,ROUNDUP ;AN000;
474 .WHEN <BL EQ 0Bh> OR ; PS/2 Model 30 with Mono or ;AN000;
475 .WHEN <BL EQ 0Ch> ; PS/2 Model 30 with Color ;AN000;
476 MOV DS:[BP].HARDWARE_CONFIG,PALACE ;AN000;
477 .ENDSELECT ;AN000;
478;-------------------------------------------------------------------------------;AN000;
479; ;AN000;
480; PS/2 call is not supported, try the EGA info call: ;AN000;
481; ;AN000;
482;-------------------------------------------------------------------------------;AN000;
483 .ELSE ;AN000;
484 MOV AH,ALT_SELECT_CALL ; Request Alternate select's ;AN000;
485 MOV BL,EGA_INFO_CALL ; "return EGA information call" ;AN000;
486 INT 10H ; Call video BIOS ;AN000;
487 .IF <BL NE EGA_INFO_CALL> ; If a memory value is returned ;AN000;
488 .THEN ; then, there is an EGA ;AN000;
489 MOV DS:[BP].HARDWARE_CONFIG,EGA ;AN000;
490 .ELSE ; else, call is not supported: ;AN000;
491;-------------------------------------------------------------------------------;AN000;
492; ;AN000;
493; EGA call is not supported, try the PC CONVERTIBLE display description call: ;AN000;
494; ;AN000;
495;-------------------------------------------------------------------------------;AN000;
496 MOV AH,DISP_DESC_CALL ;AN000;
497 INT 10H ; Call BIOS, ES:DI :=Offset of parms;AN000;
498 .IF <ES:[DI] EQ 5140H> ; If LCD display type, ;AN000;
499 .THEN ; set LCD bit in Shared Data area ;AN000;
500 MOV DS:[BP].HARDWARE_CONFIG,PC_CONVERTIBLE ;AN000;
501 .ELSE ; else, we have an old adapter. ;AN000;
502 MOV DS:[BP].HARDWARE_CONFIG,OLD_ADAPTER ; (either MONO or CGA);AN000;
503 .ENDIF ; Display type is LCD ;AN000;
504 .ENDIF ; EGA BIOS is present ;AN000;
505 .ENDIF ; PS/2 BIOS is present ;AN000;
506 RET ;AN000;
507DET_HW_CONFIG ENDP ;AN000;
508PAGE ;AN000;
509;======================================================================= ;AN000;
510; ;AN000;
511; DET_MODE_STATE : Determine the current video mode and the active page. ;AN000;
512; ;AN000;
513;----------------------------------------------------------------------- ;AN000;
514; ;AN000;
515; INPUT: HARDWARE_CONFIG = Type of video hardware attached ;AN000;
516; ;AN000;
517; OUTPUT: CUR_MODE = Video mode number (0-13H) ;AN000;
518; CUR_PAGE = Video page number (0-8) ;AN000;
519; NB_CHAR_COLUMNS = Number of columns if in a text mode. ;AN000;
520; ;AN000;
521; ;AN000;
522; CALLED BY: PRT_SCR ;AN000;
523; ;AN000;
524; ;AN000;
525;-------------------------------------------------------------------------------;AN000;
526; ;AN000;
527; DESCRIPTION: Use the BIOS interface to ;AN000;
528; obtain the current mode and active page. ;AN000;
529; ;AN000;
530; LOGIC: ;AN000;
531; ;AN000;
532; Call BIOS INTERRUPT 10H: "Return current video state" (AH = 0fh) ;AN000;
533; ;AN000;
534DET_MODE_STATE PROC NEAR ;AN000;
535 PUSH AX ;AN000;
536 PUSH BX ;AN000;
537 MOV AH,GET_STATE_CALL ;AN000;
538 INT 10H ; CALL BIOS ;AN000;
539 MOV CUR_MODE,AL ;AN000;
540 MOV NB_CHAR_COLUMNS,AH ;AN000;
541 MOV CUR_PAGE,BH ;AN000;
542 ;AN000;
543 POP BX ;AN000;
544 POP AX ;AN000;
545 RET ;AN000;
546DET_MODE_STATE ENDP ;AN000;
547 ;AN000;
548PAGE ;AN000;
549;======================================================================= ;AN000;
550; ;AN000;
551; GET_MODE_ATTR: Obtain attributes of current video mode. ;AN000;
552; ;AN000;
553;----------------------------------------------------------------------- ;AN000;
554; ;AN000;
555; INPUT: CUR_MODE = Current video mode (1 BYTE) ;AN000;
556; ;AN000;
557; OUTPUT: MODE_TYPE = Video mode type (TXT or APA) ;AN000;
558; NB_COLORS = Maximum number of colors (0-256) (0=B&W) ;AN000;
559; ERROR_CODE = Error code if error occurred. ;AN000;
560; SCREEN_HEIGHT= Number of rows (in pixels if APA or char if TEXT);AN000;
561; SCREEN_WIDTH = Number of columns (in pixels/char) ;AN000;
562; ;AN000;
563; CALLED BY: PRT_SCR ;AN000;
564; ;AN000;
565; ;AN000;
566;----------------------------------------------------------------------- ;AN000;
567; ;AN000;
568; DESCRIPTION: Scan the 2 local video mode attribute tables until the ;AN000;
569; current mode is located. Return the attributes. ;AN000;
570; For APA modes SCREEN_HEIGHT and SCREEN_WIDTH are in pixels, ;AN000;
571; for TEXT modes they are in characters. ;AN000;
572; ;AN000;
573; ;AN000;
574; LOGIC: ;AN000;
575; ;AN000;
576; Scan the APA_ATTR_TABLE ;AN000;
577; IF FOUND ;AN000;
578; MODE_TYPE := APA ;AN000;
579; NB_COLORS := mode.MAX_COLORS ;AN000;
580; SCREEN_HEIGHT := mode.NB_L ;AN000;
581; SCREEN_WIDTH := mode.NB_C ;AN000;
582; ELSE ;AN000;
583; Scan the TXT_ATTR_TABLE ;AN000;
584; When FOUND ;AN000;
585; MODE_TYPE := TXT ;AN000;
586; NB_COLORS := mode.NUM_COLORS ;AN000;
587; SCREEN_WIDTH := NB_CHAR_COLUMNS ;AN000;
588; SCREEN_HEIGHT := Byte in ROM BIOS at 40:84 ;AN000;
589; ;AN000;
590;----------------------------------------------------------------------- ;AN000;
591GET_MODE_ATTR PROC NEAR ;AN000;
592 JMP SHORT GET_MODE_ATTR_BEGIN ;AN000;
593;----------------------------------------------------------------------- ;AN000;
594; ;AN000;
595; LOCAL DATA ;AN000;
596; ;AN000;
597;----------------------------------------------------------------------- ;AN000;
598 ;AN000;
599APA_ATTR STRUC ; ATTRIBUTES FOR APA MODES: ;AN000;
600 APA_MODE DB ? ; Mode number ;AN000;
601 NB_C DW ? ; Number of columns ;AN000;
602 NB_L DW ? ; Number of lines ;AN000;
603 MAX_COLORS DW ? ; Maximum number of colors available (0=B&W) ;AN000;
604APA_ATTR ENDS ;AN000;
605 ;AN000;
606TXT_ATTR STRUC ; ATTRIBUTES FOR TXT MODES: ;AN000;
607 TXT_MODE DB ? ; Mode number ;AN000;
608 NUM_COLORS DB ? ; Number of colors ;AN000;
609TXT_ATTR ENDS ;AN000;
610 ;AN000;
611;----------------------------------------------------------------------- ;AN000;
612; ;AN000;
613; APA MODE ATTRIBUTES: ;AN000;
614; ;AN000;
615;----------------------------------------------------------------------- ;AN000;
616NB_APA_MODES DW 10 ;AN000;
617APA_ATTR_TABLE LABEL WORD ;AN000;
618MODE04 APA_ATTR < 4,320,200, 4> ;AN000;
619MODE05 APA_ATTR < 5,320,200, 4> ;AN000;
620MODE06 APA_ATTR < 6,640,200, 2> ;AN000;
621MODE0D APA_ATTR <0DH,320,200, 16> ;AN000;
622MODE0E APA_ATTR <0EH,640,200, 16> ;AN000;
623MODE0F APA_ATTR <0FH,640,350, 4> ;AN000;
624MODE10H APA_ATTR <10H,640,350, 16> ;AN000;
625MODE11H APA_ATTR <11H,640,480, 2> ;AN000;
626MODE12H APA_ATTR <12H,640,480, 16> ;AN000;
627MODE13H APA_ATTR <13H,320,200,256> ;AN000;
628 ;AN000;
629;----------------------------------------------------------------------- ;AN000;
630; ;AN000;
631; TXT MODE ATTRIBUTES: ;AN000;
632; ;AN000;
633;----------------------------------------------------------------------- ;AN000;
634NB_TXT_MODES DW 5 ;AN000;
635TXT_ATTR_TABLE LABEL WORD ;AN000;
636MODE00 TXT_ATTR < 0, 16> ;AN000;
637MODE01 TXT_ATTR < 1, 16> ;AN000;
638MODE02 TXT_ATTR < 2, 16> ;AN000;
639MODE03 TXT_ATTR < 3, 16> ;AN000;
640MODE07 TXT_ATTR < 7, 0> ;AN000;
641 ;AN000;
642;----------------------------------------------------------------------- ;AN000;
643; ;AN000;
644; BEGIN OF GET_MODE_ATTR ;AN000;
645; ;AN000;
646;----------------------------------------------------------------------- ;AN000;
647GET_MODE_ATTR_BEGIN: ;AN000;
648 PUSH AX ;AN000;
649 PUSH BX ;AN000;
650 PUSH CX ;AN000;
651 PUSH DX ;AN000;
652 MOV DL,CUR_MODE ; DL = CURRENT MODE ;AN000;
653; ;AN000;
654; Scan the APA_ATTR_TABLE ;AN000;
655; ;AN000;
656 MOV CX,NB_APA_MODES ; CS <-- Number of APA modes ;AN000;
657 MOV BX,OFFSET APA_ATTR_TABLE; BX <-- Offset of APA mode table ;AN000;
658 SCAN_APA: ;AN000;
659 CMP DL,[BX].APA_MODE ; IF mode found ;AN000;
660 JE SHORT ITS_APA ; THEN get its attributes ;AN000;
661 ADD BX,SIZE APA_ATTR ;AN000;
662 LOOP SCAN_APA ; ELSE keep scanning ;AN000;
663 JMP SHORT SCAN_TXT_INIT ; NOT in this table: scan txt modes ;AN000;
664ITS_APA: ;AN000;
665 MOV MODE_TYPE,APA ; MODE = APA ;AN000;
666 MOV AX,[BX].MAX_COLORS ;AN000;
667 MOV NB_COLORS,AX ; Get number of colors ;AN000;
668 MOV AX,[BX].NB_L ;AN000;
669 MOV SCREEN_HEIGHT,AX ; Get number of lines ;AN000;
670 MOV AX,[BX].NB_C ;AN000;
671 MOV SCREEN_WIDTH,AX ; Get number of columns ;AN000;
672 JMP SHORT GET_MODE_ATTR_END ;AN000;
673 ;AN000;
674; ;AN000;
675; Scan the TXT_ATTR_TABLE ;AN000;
676; ;AN000;
677SCAN_TXT_INIT: ;AN000;
678 MOV CX,NB_TXT_MODES ; CX <-- Number of TXT modes ;AN000;
679 MOV BX,OFFSET TXT_ATTR_TABLE; BX <-- Offset of TXT mode table ;AN000;
680 SCAN_TXT: ;AN000;
681 CMP DL,[BX].TXT_MODE ; IF mode found ;AN000;
682 JE SHORT ITS_TXT ; THEN get its attributes ;AN000;
683 ADD BX,SIZE TXT_ATTR ;AN000;
684 LOOP SCAN_TXT ; ELSE keep scanning ;AN000;
685ITS_TXT: ;AN000;
686 MOV MODE_TYPE,TXT ; MODE = TXT ;AN000;
687 MOV AL,[BX].NUM_COLORS ;AN000;
688 CBW ;AN000;
689 MOV NB_COLORS,AX ; Get number of colors ;AN000;
690 MOV AL,NB_CHAR_COLUMNS ; Get number of columns ;AN000;
691 CBW ;AN000;
692 MOV SCREEN_WIDTH,AX ;AN000;
693 .IF <DS:[BP].HARDWARE_CONFIG EQ OLD_ADAPTER>; If an old adapter is there;AN000;
694 .THEN ; The number of lines is 25 ;AN000;
695 MOV SCREEN_HEIGHT,25 ;AN000;
696 .ELSE ;AN000;
697 MOV AX,BIOS_SEG ; Get number of rows ;AN000;
698 MOV ES,AX ; from BIOS Data Area ;AN000;
699 MOV BX,NB_ROWS_OFFSET ; at 0040:0084 ;AN000;
700 MOV AL,ES:[BX] ;AN000;
701 CBW ;AN000;
702 INC AX ;AN000;
703 MOV SCREEN_HEIGHT,AX ;AN000;
704 .ENDIF ;AN000;
705 JMP SHORT GET_MODE_ATTR_END ;AN000;
706 ;AN000;
707; ;AN000;
708; The current mode was not found in any of the tables ;AN000;
709; ;AN000;
710 MOV ERROR_CODE,MODE_NOT_SUPPORTED ;AN000;
711 ;AN000;
712GET_MODE_ATTR_END: ;AN000;
713 POP AX ;AN000;
714 POP BX ;AN000;
715 POP CX ;AN000;
716 POP DX ;AN000;
717 RET ;AN000;
718GET_MODE_ATTR ENDP ;AN000;
719PAGE ;AN000;
720;======================================================================= ;AN000;
721; ;AN000;
722; SET_UP_XLT_TABLE : SET UP A COLOR MAPPING FOR EACH COLOR AVAILABLE ;AN000;
723; WITH THE CURRENT MODE ;AN000;
724; ;AN000;
725;----------------------------------------------------------------------- ;AN000;
726; ;AN000;
727; INPUT: CUR_MODE = Current video mode. ;AN000;
728; HARDWARE_CONFIG = Type of display adapter. ;AN000;
729; PRINTER_TYPE = Type of printer attached (Color or B&W) ;AN000;
730; XLT_TAB = Color translation table. ;AN000;
731; CUR_PAGE = Active page number ;AN000;
732; BP = Offset of the shared data area ;AN000;
733; ;AN000;
734; ;AN000;
735; OUTPUT: XLT_TAB IS UPDATED ;AN000;
736; ;AN000;
737; CALLED BY: PRT_SCR ;AN000;
738; ;AN000;
739;----------------------------------------------------------------------- ;AN000;
740; ;AN000;
741; DESCRIPTION: The table is updated to hold a mapping for each color ;AN000;
742; available in the current video mode either TEXT or APA. ;AN000;
743; ;AN000;
744; For example, if the current mode supports 16 colors then the first ;AN000;
745; sixteen bytes of the table will hold the corresponding Color printer ;AN000;
746; or Black and White printer mappings for these colors. ;AN000;
747; ;AN000;
748; ;AN000;
749; LOGIC: ;AN000;
750; ;AN000;
751; IF HARDWARE_CONFIG = CGA OR HARDWARE_CONFIG = PC_CONVERTIBLE ;AN000;
752; THEN ;AN000;
753; CALL SET_CGA_XLT_TAB ;AN000;
754; ;AN000;
755; ELSE IF HARDWARE_CONFIG = EGA ;AN000;
756; THEN ;AN000;
757; CALL SET_EGA_XLT_TAB ;AN000;
758; ;AN000;
759; ELSE IF CUR_MODE = 0FH ;AN000;
760; THEN ;AN000;
761; CALL SET_MODE_F_XLT_TAB ;AN000;
762; ;AN000;
763; ELSE IF CUR_MODE = 19 ;AN000;
764; THEN ;AN000;
765; CALL SET_MODE_13H_XLT_TAB ;AN000;
766; ;AN000;
767; ELSE ;AN000;
768; CALL SET_ROUNDUP_XLT_TAB ;AN000;
769; ;AN000;
770; CALL SET_BACKG_IN_XLT_TAB ; Update the background in the translation table ;AN000;
771; ;AN000;
772SET_UP_XLT_TAB PROC NEAR ;AN000;
773;-------------------------------------------------------------------------------;AN000;
774; For old display modes: set up translation table as for a Color Graphics Adapt.;AN000;
775; Either 4 or 16 colors are set up depending if the mode is an APA or text mode.;AN000;
776; ;AN000;
777; NOTE: SET_UP_XLT_TAB cannot be invoked if the display adater is a Monochrome ;AN000;
778; display adater. (When a Mono. adapter is attached, a jump is made to ;AN000;
779; the ROM BIOS for printing the screen, and no translation table is set). ;AN000;
780;-------------------------------------------------------------------------------;AN000;
781.IF <BIT DS:[BP].HARDWARE_CONFIG NZ OLD_ADAPTER> OR ; IF it is a CGA ;AN000;
782.IF <BIT DS:[BP].HARDWARE_CONFIG NZ PC_CONVERTIBLE> ; or a PC convertible ;AN000;
783.THEN ; THEN set up CGA colors ;AN000;
784 CALL SET_CGA_XLT_TAB ; ;AN000;
785.ELSEIF <BIT DS:[BP].HARDWARE_CONFIG NZ EGA> ; ELSEIF it is an EGA ;AN000;
786 CALL SET_EGA_XLT_TAB ; set up EGA colors. ;AN000;
787.ELSEIF <CUR_MODE EQ 0FH> ; ELSEIF we are in mode 15 ;AN000;
788 CALL SET_MODE_F_XLT_TAB ; set up its 4 shades ;AN000;
789;-------------------------------------------------------------------------------;AN000;
790; A PS/2 system is attached: (we either have a PALACE [Model 30] or a ROUNDUP) ;AN000;
791;-------------------------------------------------------------------------------;AN000;
792.ELSEIF <CUR_MODE EQ 13H> ; ELSEIF current mode is 13h;AN000;
793 CALL SET_MODE_13H_XLT_TAB ; set up 256 colors ;AN000;
794.ELSEIF <BIT DS:[BP].HARDWARE_CONFIG NZ PALACE> ; ELSEIF PS/2 Model 30(MCGA);AN000;
795 CALL SET_CGA_XLT_TAB ; handle it like a CGA ;AN000;
796.ELSE ; ELSE we have a ROUNDUP ;AN000;
797;-------------------------------------------------------------------------------;AN000;
798; A PS/2 model 50, 60 or 80 or an ADA 'B' card is attached (in 16 color mode): ;AN000;
799;-------------------------------------------------------------------------------;AN000;
800 CALL SET_ROUNDUP_XLT_TAB ; set up 16 colors ;AN000;
801.ENDIF ;AN000;
802;-------------------------------------------------------------------------------;AN000;
803; Finish setting up the translation table: ;AN000;
804;-------------------------------------------------------------------------------;AN000;
805 ;AN000;
806CALL SET_BACKG_IN_XLT_TAB ; Update the background in the translation table ;AN000;
807 ; according to the command line switch setting ;AN000;
808 ; (i.e.,/R /B) ;AN000;
809 RET ;AN000;
810SET_UP_XLT_TAB ENDP ;AN000;
811PAGE ;AN000;
812;===============================================================================;AN000;
813; ;AN000;
814; SET_BACKG_IN_XLT_TAB : ADJUST THE MAPPING FOR THE BACKGROUND COLOR IN THE ;AN000;
815; XLT_TAB ACCORDING TO PRINTER TYPE AND /R /B. ;AN000;
816; ;AN000;
817; ;AN000;
818;-------------------------------------------------------------------------------;AN000;
819; ;AN000;
820; INPUT: BP = Offset of shared data area (SWITCHES) ;AN000;
821; XLT_TAB = The color translation table. ;AN000;
822; ;AN000;
823; OUTPUT: XLT_TAB IS UPDATED ;AN000;
824; ;AN000;
825;-------------------------------------------------------------------------------;AN000;
826; ;AN000;
827; DESCRIPTION: If there is a black and white printer and /R is NOT specified ;AN000;
828; then the background color should not be printed and it is replaced in the ;AN000;
829; translation table by the Intensity for white (will print nothing). ;AN000;
830; ;AN000;
831; If a color printer is attached and /B is not specified then the background ;AN000;
832; color is replaced by the Print Band mask for white. ;AN000;
833; ;AN000;
834; LOGIC: ;AN000;
835; IF (a black and white printer is attached) AND (/R is OFF) ;AN000;
836; THEN ;AN000;
837; MOV XLT_TAB, WHITE_INT ; Store white in translation table ;AN000;
838; ELSE (a color printer is attached) ;AN000;
839; IF (/B is ON) ;AN000;
840; THEN ;AN000;
841; RGB.R := MAX_INT ;AN000;
842; RGB.G := MAX_INT ;AN000;
843; RGB.B := MAX_INT ;AN000;
844; CALL RGB2BAND ; Convert RGB for white to a Band Mask ;AN000;
845; MOV XLT_TAB,AL ; Store the band mask in the xlt table ;AN000;
846; ;AN000;
847; ;AN000;
848;-------------------------------------------------------------------------------;AN000;
849SET_BACKG_IN_XLT_TAB PROC NEAR ;AN000;
850;-------------------------------------------------------------------------------;AN000;
851; ;AN000;
852; Test if a black and white printer is attached. ;AN000;
853; ;AN000;
854;-------------------------------------------------------------------------------;AN000;
855.IF <BIT DS:[BP].PRINTER_TYPE NZ BLACK_WHITE> AND ; IF black and white ;AN000;
856.IF <BIT DS:[BP].SWITCHES Z REVERSE_SW> ; printer and not /R ;AN000;
857.THEN ; then, map background ;AN000;
858 MOV XLT_TAB,WHITE_INT ; to white. ;AN000;
859;-------------------------------------------------------------------------------;AN000;
860; ;AN000;
861; A Color printer is attached: ;AN000;
862; ;AN000;
863;-------------------------------------------------------------------------------;AN000;
864.ELSEIF <BIT DS:[BP].PRINTER_TYPE NZ COLOR> AND ; else, if color printer ;AN000;
865.IF <BIT DS:[BP].SWITCHES Z BACKGROUND_SW> ; and /B if OFF ;AN000;
866.THEN ; ;AN000;
867 ; Store a null band mask ;AN000;
868 MOV XLT_TAB,0 ; the translation table. ;AN000;
869.ENDIF ;AN000;
870 RET ;AN000;
871SET_BACKG_IN_XLT_TAB ENDP ;AN000;
872PAGE ;AN000;
873;======================================================================= ;AN000;
874; ;AN000;
875; SET_EGA_XLT_TAB : SET UP COLOR TRANSLATION TABLE FOR ENHANCED GRAPHIC ;AN000;
876; ADAPTER ;AN000;
877; ;AN000;
878;----------------------------------------------------------------------- ;AN000;
879; ;AN000;
880; INPUT: XLT_TAB = Color translation table. ;AN000;
881; PRINTER_TYPE = Type of printer attached (Color or B&W) ;AN000;
882; SWITCHES = GRAPHICS command line parameters. ;AN000;
883; ;AN000;
884; OUTPUT: XLT_TAB IS UPDATED ;AN000;
885; ;AN000;
886; CALLED BY: SET_UP_XLT_TABLE ;AN000;
887; ;AN000;
888;----------------------------------------------------------------------- ;AN000;
889; ;AN000;
890; NOTES: With the EGA, "VIDEO BIOS READ DOT call" returns an index into ;AN000;
891; the 16 EGA palette registers. ;AN000;
892; ;AN000;
893; These registers contain the actual colors stored as rgbRGB components ;AN000;
894; (see EGA_COL2RGB for details) for mode hex 10. Under mode hex E these ;AN000;
895; registers contain the actual colors as I0RGB components (see CGA_COL2RGB ;AN000;
896; for details). ;AN000;
897; ;AN000;
898; These registers can be Revised by the user but, are 'WRITE ONLY'. ;AN000;
899; However, it is possible to define a SAVE AREA where BIOS will maintain ;AN000;
900; a copy of the palette registers. ;AN000;
901; ;AN000;
902; This area is called the "DYNAMIC SAVE AREA" and is defined via the ;AN000;
903; BIOS EGA SAVE_PTR AREA. Whenever the palette registers are changed by ;AN000;
904; the user, BIOS updates the EGA_SAVE_AREA. ;AN000;
905; ;AN000;
906; The 16 palette registers are the first 16 bytes of the DYNAMIC SAVE AREA. ;AN000;
907; ;AN000;
908; This program takes advantage of this feature and consults the EGA DYNAMIC ;AN000;
909; SAVE AREA in order to obtain the colors used in the active screen. ;AN000;
910; ;AN000;
911; ;AN000;
912; DESCRIPTION: Obtain each color available with an EGA by reading its ;AN000;
913; palette register in the EGA_SAVE_AREA: ;AN000;
914; ;AN000;
915; Calculate the mapping for this color, either a BAND_MASK or a ;AN000;
916; GREY INTENSITY and store it in the color translation table. ;AN000;
917; ;AN000;
918; ;AN000;
919; LOGIC: ;AN000;
920; ;AN000;
921; Obtain the DYNAMIC EGA SAVE AREA offset from the BIOS SAVE_PTR_AREA. ;AN000;
922; ;AN000;
923; If current mode is either 4,5 or 6 ;AN000;
924; Then, ;AN000;
925; CALL SET_CGA_XLT_TAB ;AN000;
926; Get the background color by reading palette register number 0 ;AN000;
927; Else, ;AN000;
928; For each register number (0 to 15): ;AN000;
929; Get the register contents (rgbRGB values) from the EGA SAVE AREA ;AN000;
930; CALL EGA_COL2RGB ; Obtain the Red, Green, Blue values ;AN000;
931; CALL RGB2XLT_TAB ; Obtain a Band Mask or a Grey Intensity ;AN000;
932; ; and store the result in the XLT_TAB ;AN000;
933; ;AN000;
934SET_EGA_XLT_TAB PROC NEAR ;AN000;
935 PUSH AX ; Save the registers used ;AN000;
936 PUSH BX ;AN000;
937 PUSH CX ;AN000;
938 PUSH DX ;AN000;
939 PUSH DI ;AN000;
940 ;AN000;
941;-------------------------------------------------------------------------------;AN000;
942; ;AN000;
943; Obtain the pointer to the DYNAMIC SAVE AREA from the SAVE AREA POINTER TABLE: ;AN000;
944; ;AN000;
945;-------------------------------------------------------------------------------;AN000;
946EGA_SAVE_PTR EQU 4A8H ; EGA BIOS pointer to table of ;AN000;
947 ; pointer to save areas. ;AN000;
948 XOR AX,AX ; ES segment := paragraph 0 ;AN000;
949 MOV ES,AX ;AN000;
950 ;AN000;
951 LES BX,ES:DWORD PTR EGA_SAVE_PTR ; ES:BX := Pointer to ptr table ;AN000;
952 LES BX,ES:[BX]+4 ; ES:BX := Pointer to dynamic save area;AN000;
953 ; (NOTE: It is the second pointer in ;AN000;
954 ; the table) ;AN000;
955 ;AN000;
956;-------------------------------------------------------------------------------;AN000;
957; ;AN000;
958; Set up one entry in the translation table for each color available. ;AN000;
959; ;AN000;
960;-------------------------------------------------------------------------------;AN000;
961.IF <CUR_MODE EQ 4> OR ; If the current mode is an old CGA ;AN000;
962.IF <CUR_MODE EQ 5> OR ; GRAPHICS mode: ;AN000;
963.IF <CUR_MODE EQ 6> ;AN000;
964.THEN ;AN000;
965;-------------------------------------------------------------------------------;AN000;
966; Current mode is either mode 4, 5 or 6; ;AN000;
967; Store each color of the old CGA All Points Addressable mode: ;AN000;
968;-------------------------------------------------------------------------------;AN000;
969 CALL SET_CGA_XLT_TAB ; Set up colors in the translation ;AN000;
970 ; table, NOTE: The background color ;AN000;
971 ; will not be set properly since the ;AN000;
972 ; EGA BIOS does not update memory ;AN000;
973 ; location 40:66 with the value ;AN000;
974 ; of the background color as CGA ;AN000;
975 ; does. ;AN000;
976;------Adjust the background color in the translation table: ;AN000;
977;------The background color is obtained from the EGA DYNAMIC SAVE AREA ;AN000;
978;------ES:BX = Address of the EGA DYNAMIC SAVE AREA ;AN000;
979;------NOTE : For CGA compatible modes EGA BIOS stores the color in the ;AN000;
980;------DYNAMIC SAVE AREA as a I0RGB value. ;AN000;
981 XOR DI,DI ; DI:=register number = index in XLT_TAB;AN000;
982 MOV AL,ES:[BX][DI] ; AL:=Palette register 0 = Back. color ;AN000;
983 MOV AH,AL ; Convert I0RGB to IRGB (CGA color) ;AN001;
984 AND AL,111B ; Isolate RGB bits ;AN001;
985 AND AH,10000B ; Isolate I bit ;AN001;
986 SHR AH,1 ; Move I bit from position 5 to 4 ;AN001;
987 OR AL,AH ; Get IRGB byte. ;AN001;
988 CALL CGA_COL2RGB ; Convert IRGB to R,G,B values ;AN001;
989 CALL RGB2XLT_TAB ; Convert RGB to an entry in XLT_TAB ;AN000;
990 ;AN000;
991.ELSE ; ELSE, we have an EGA graphics mode: ;AN000;
992;-------------------------------------------------------------------------------;AN000;
993; The current mode is a either a text mode or one of the EGA enhanced mode; ;AN000;
994; Store in the translation table each color available (these modes have 16 col.);AN000;
995;-------------------------------------------------------------------------------;AN000;
996 MOV CX,16 ; CX := Number of palette registers ;AN000;
997 ; to read ;AN000;
998 XOR DI,DI ; DI := Palette register number ;AN000;
999 ; and index in the translation table ;AN000;
1000STORE_1_EGA_COLOR: ;AN000;
1001 MOV AL,ES:[BX][DI] ; AL := Palette register ;AN000;
1002 .IF <CUR_MODE EQ 14> OR ; If mode E (hex) OR mode D (hex) ;AN000;
1003 .IF <CUR_MODE EQ 13> ; the colors are ;AN000;
1004 .THEN ; stored as I0CGA colors ;AN000;
1005 MOV AH,AL ; Convert I0RGB to IRGB (CGA color) ;AN000;
1006 AND AL,111B ; Isolate RGB bits ;AN000;
1007 AND AH,10000B ; Isolate I bit ;AN000;
1008 SHR AH,1 ; Move I bit from position 5 to 4 ;AN000;
1009 OR AL,AH ; Get IRGB byte. ;AN000;
1010 CALL CGA_COL2RGB ; Convert IRGB to R,G,B values ;AN000;
1011 .ELSE ; Else, they are stored as (rgbRGB); ;AN000;
1012 CALL EGA_COL2RGB ; Convert register to R,G,B values ;AN000;
1013 .ENDIF ;AN000;
1014 CALL RGB2XLT_TAB ; Convert RGB to an entry in XLT_TAB ;AN000;
1015 INC DI ; Get next palette register number ;AN000;
1016 LOOP STORE_1_EGA_COLOR ;AN000;
1017.ENDIF ; ENDIF 4 colors or 16 colors ;AN000;
1018 ;AN000;
1019 POP DI ; Restore the registers ;AN000;
1020 POP DX ;AN000;
1021 POP CX ;AN000;
1022 POP BX ;AN000;
1023 POP AX ;AN000;
1024 RET ;AN000;
1025SET_EGA_XLT_TAB ENDP ;AN000;
1026PAGE ;AN000;
1027;======================================================================= ;AN000;
1028; ;AN000;
1029; SET_CGA_XLT_TAB : SET UP COLOR TRANSLATION TABLE FOR COLOR GRAPHIC ;AN000;
1030; ADAPTER ;AN000;
1031; ;AN000;
1032;----------------------------------------------------------------------- ;AN000;
1033; ;AN000;
1034; INPUT: XLT_TAB = Color translation table. ;AN000;
1035; PRINTER_TYPE = Type of printer attached (Color or B&W) ;AN000;
1036; SWITCHES = GRAPHICS command line parameters. ;AN000;
1037; ;AN000;
1038; OUTPUT: XLT_TAB IS UPDATED ;AN000;
1039; ;AN000;
1040; CALLED BY: SET_UP_XLT_TABLE ;AN000;
1041; ;AN000;
1042;----------------------------------------------------------------------- ;AN000;
1043; ;AN000;
1044; NOTES: With the CGA, the "VIDEO BIOS READ DOT call" returns a number ;AN000;
1045; from 0 to 3. A dot of value 0 is of the background color. ;AN000;
1046; ;AN000;
1047; The actual value of the background color is stored in BIOS VIDEO ;AN000;
1048; DISPLAY DATA AREA as a PIIRGB value (see CGA_COL2RGB for details) and ;AN000;
1049; can be any of 16 colors. ;AN000;
1050; ;AN000;
1051; A dot of value 1,2, or 3 represents any of 2 specific colors depending ;AN000;
1052; on the current color palette. ;AN000;
1053; ;AN000;
1054; The palette number is obtained from the BIOS VIDEO DISPLAY DATA AREA ;AN000;
1055; (It is the "P" bit or bit number 5) ;AN000;
1056; ;AN000;
1057; The dot values 1,2,3 expressed in binary actually represent the RG ;AN000;
1058; (Red, Green) components of the color. ;AN000;
1059; ;AN000;
1060; The palette number represents the B (Blue) component therefore, when ;AN000;
1061; the palette number is appended to the color number we obtain the RGB ;AN000;
1062; components for that color. ;AN000;
1063; ;AN000;
1064; (E.G., COLOR = 010 ; COLOR # 2 ;AN000;
1065; PALETTE= 0 ; PALETTE # 0 ;AN000;
1066; ;AN000;
1067; IRGB = 0100 ; Intensity = 0 Ä¿ ;AN000;
1068; ; Red = 1 ÃÄÄÄ> color = Red ;AN000;
1069; ; Green = 0 ³ ;AN000;
1070; ; Blue = 0 ÄÙ ;AN000;
1071; ;AN000;
1072; ;AN000;
1073; DESCRIPTION: ;AN000;
1074; ;AN000;
1075; For each color available with a CGA: ;AN000;
1076; Calculate the color mapping, either a BAND_MASK or a GREY ;AN000;
1077; INTENSITY and store it in the color translation table. ;AN000;
1078; ;AN000;
1079; LOGIC: ;AN000;
1080; ;AN000;
1081; ; Obtain the background color from VIDEO BIOS DATA AREA ;AN000;
1082; ; and the paletter number ;AN000;
1083; ;AN000;
1084; ; Store the Background color: ;AN000;
1085; CALL CGA_COL2RGB ; Convert IRGB components to RGB values ;AN000;
1086; CALL RGB2XLT_TAB ; Convert RGB to an entry in the translation ;AN000;
1087; ; table ;AN000;
1088; ; Store all other colors: ;AN000;
1089; FOR IRG := 1 TO 3 ; Obtain the color number ;AN000;
1090; Append palette number (B) to IRG ;AN000;
1091; CALL CGA_COL2RGB ; Convert color to RGB values ;AN000;
1092; CALL RGB2XLT_TAB ; Convert RGB to an entry in the translation ;AN000;
1093; ; table ;AN000;
1094; ;AN000;
1095SET_CGA_XLT_TAB PROC NEAR ;AN000;
1096 PUSH AX ;AN000;
1097 PUSH BX ;AN000;
1098 PUSH CX ;AN000;
1099 PUSH DI ;AN000;
1100 PUSH ES ;AN000;
1101 ;AN000;
1102.IF <CUR_MODE EQ 4> OR ;AN000;
1103.IF <CUR_MODE EQ 5> ;AN000;
1104;===============================================================================;AN000;
1105; ;AN000;
1106; THE CURRENT MODE IS MODE 4 OR 5 ;AN000;
1107; ;AN000;
1108;-------------------------------------------------------------------------------;AN000;
1109.THEN ;AN000;
1110;-------------------------------------------------------------------------------;AN000;
1111; Read the CRT palette from the BIOS ROM to obtain the background color and ;AN000;
1112; the current palette number; store the palette number in BL ;AN000;
1113;-------------------------------------------------------------------------------;AN000;
1114ROM_BIOS_SEG EQU 40H ; CGA BIOS SEGMENT ;AN000;
1115CRT_PALETTE_OFF EQU 66H ; BIOS Current palette setting ;AN000;
1116P_BIT_MASK EQU 100000B ; bit 5 = Current palette ;AN000;
1117I_BIT_MASK EQU 1000B ; bit 4 = Intensity bit ;AN000;
1118R_BIT_MASK EQU 100B ; bit 2 = Red bit ;AN000;
1119G_BIT_MASK EQU 10B ; bit 1 = Green bit ;AN000;
1120B_BIT_MASK EQU 1B ; bit 0 = Blue bit ;AN000;
1121 ;AN000;
1122 MOV AX,ROM_BIOS_SEG ; ES := ROM BIOS SEGMENT ;AN000;
1123 PUSH AX ;AN000;
1124 POP ES ;AN000;
1125 ;AN000;
1126 MOV AL,ES:CRT_PALETTE_OFF; AL := CRT Palette (00PIIRGB) ;AN000;
1127 MOV BL,P_BIT_MASK ; LOW NIBBLE = BACKGROUND COLOR ;AN000;
1128 AND BL,AL ; BL := Palette number ;AN000;
1129 MOV CL,5 ;AN000;
1130 SHR BL,CL ;AN000;
1131 ;AN000;
1132 XOR DI,DI ; DI := Index in the XLT_TAB ;AN000;
1133;-------------------------------------------------------------------------------;AN000;
1134; Store the background color, (obtained from low 4 bits of the byte at 40:66) ;AN000;
1135;-------------------------------------------------------------------------------;AN000;
1136 CALL CGA_COL2RGB ; Convert color (in AL) to R, G, B values ;AN000;
1137 CALL RGB2XLT_TAB ; Convert RGB to an entry in XLT_TAB ;AN000;
1138;-------------------------------------------------------------------------------;AN000;
1139; Store the 3 foreground colors for mode 4 and 5 ;AN000;
1140;-------------------------------------------------------------------------------;AN000;
1141 MOV CX,3 ; For each color, but the background: ;AN000;
1142STORE_1_CGA_MODE4_COLOR: ;AN000;
1143 INC DI ; Increment index in the translation table ;AN000;
1144 MOV AX,DI ; AL := IRG ;AN000;
1145 SHL AL,1 ;AN000;
1146 OR AL,BL ; AL := IRGB ;AN000;
1147 CALL CGA_COL2RGB ; Convert color (in AL) to R, G, B values ;AN000;
1148 CALL RGB2XLT_TAB ; Convert RGB to an entry in XLT_TAB ;AN000;
1149 LOOP STORE_1_CGA_MODE4_COLOR ;AN000;
1150.ELSEIF <CUR_MODE EQ 6> ;AN000;
1151;===============================================================================;AN000;
1152; ;AN000;
1153; THE CURRENT MODE IS MODE 6 ;AN000;
1154; ;AN000;
1155;-------------------------------------------------------------------------------;AN000;
1156.THEN ;AN000;
1157;-------------------------------------------------------------------------------;AN000;
1158; Store background color for mode 6 (mode 6 is a 2 colors, APA mode) ;AN000;
1159; Background is stored as BLACK ;AN000;
1160;-------------------------------------------------------------------------------;AN000;
1161 XOR DI,DI ; DI := Index of color in translation table ;AN000;
1162 MOV RGB.R,BLACK_INT ; Foreground color is white ;AN000;
1163 MOV RGB.G,BLACK_INT ; RGB := RGB of white ;AN000;
1164 MOV RGB.B,BLACK_INT ; ;AN000;
1165 CALL RGB2XLT_TAB ; Convert RGB to an entry in XLT_TAB ;AN000;
1166;-------------------------------------------------------------------------------;AN000;
1167; Store foreground color for mode 6 (mode 6 is a 2 colors, APA mode) ;AN000;
1168;-------------------------------------------------------------------------------;AN000;
1169 INC DI ; DI := Index of color in translation table ;AN000;
1170 MOV RGB.R,WHITE_INT ; Background color is BLACK ;AN000;
1171 MOV RGB.G,WHITE_INT ; RGB := RGB of BLACK ;AN000;
1172 MOV RGB.B,WHITE_INT ; ;AN000;
1173 CALL RGB2XLT_TAB ; Convert RGB to an entry in XLT_TAB ;AN000;
1174.ELSE ;AN000;
1175;===============================================================================;AN000;
1176; ;AN000;
1177; THE CURRENT MODE IS A TEXT MODE: ;AN000;
1178; ;AN000;
1179;-------------------------------------------------------------------------------;AN000;
1180 XOR DI,DI ; DI := Index in the translation table ;AN000;
1181 MOV CX,16 ; For each of the 16 colors: ;AN000;
1182STORE_1_CGA_TEXT_COLOR: ;AN000;
1183 MOV AX,DI ; AL := IRGB ;AN000;
1184 CALL CGA_COL2RGB ; Convert color (in AL) to R, G, B values ;AN000;
1185 CALL RGB2XLT_TAB ; Convert RGB to an entry in XLT_TAB ;AN000;
1186 INC DI ; Increment index in the translation table ;AN000;
1187 LOOP STORE_1_CGA_TEXT_COLOR ;AN000;
1188.ENDIF ; ;AN000;
1189 ;AN000;
1190 POP ES ;AN000;
1191 POP DI ;AN000;
1192 POP CX ;AN000;
1193 POP BX ;AN000;
1194 POP AX ;AN000;
1195 ;AN000;
1196 RET ;AN000;
1197SET_CGA_XLT_TAB ENDP ;AN000;
1198PAGE ;AN000;
1199;===============================================================================;AN000;
1200; ;AN000;
1201; RGB2XLT_TAB: CONVERT R,G,B VALUES TO EITHER A BAND MASK OR AN INTENSITY ;AN000;
1202; STORE THE RESULT IN THE TRANSLATION TABLE ;AN000;
1203; ;AN000;
1204;-------------------------------------------------------------------------------;AN000;
1205; ;AN000;
1206; INPUT: DI = Index in the translation table ;AN000;
1207; RGB = Red Green Blue values of the color to be stored. ;AN000;
1208; ;AN000;
1209; OUTPUT: XLT_TAB is updated ;AN000;
1210; ;AN000;
1211;-------------------------------------------------------------------------------;AN000;
1212; DESCRIPTION: Convert the RGB values to either a Band mask or an intensity ;AN000;
1213; depending on the printer type; store the result in the translation table. ;AN000;
1214; ;AN000;
1215; LOGIC: ;AN000;
1216; IF PRINTER_TYPE = COLOR ;AN000;
1217; THEN ;AN000;
1218; CALL RGB2BAND ; Obtain a Band Mask ;AN000;
1219; ELSE ; Printer is Monochrome ;AN000;
1220; CALL RGB2INT ; Obtain a Grey Intensity ;AN000;
1221; Store the result in the XLT_TAB ;AN000;
1222; ;AN000;
1223RGB2XLT_TAB PROC NEAR ;AN000;
1224 .IF <DS:[BP].PRINTER_TYPE EQ COLOR>; Color printer ? ;AN000;
1225 .THEN ;AN000;
1226;-------A color printer is attached: ;AN000;
1227 CALL RGB2BAND ; Yes, convert RGB to color band (in AL);AN000;
1228 .ELSE ;AN000;
1229;-------A black and white printer is attached: ;AN000;
1230 CALL RGB2INT ; No, RGB to an intensity in AL ;AN000;
1231 .ENDIF ;AN000;
1232;-------Store the result ;AN000;
1233 MOV XLT_TAB[DI],AL ;AN000;
1234 RET ;AN000;
1235RGB2XLT_TAB ENDP ;AN000;
1236PAGE ;AN000;
1237;===============================================================================;AN000;
1238; ;AN000;
1239; CGA_COL2RGB : CONVERT A COLOR FROM THE CGA TO RED GREEN BLUE VALUES ;AN000;
1240; ;AN000;
1241;-------------------------------------------------------------------------------;AN000;
1242; ;AN000;
1243; INPUT: AL = 0000IRGB ONE BYTE WHERE BIT: ;AN000;
1244; ;AN000;
1245; I = Intensity bit ;AN000;
1246; R = Red component ;AN000;
1247; G = Green component ;AN000;
1248; B = Blue component ;AN000;
1249; ;AN000;
1250; ;AN000;
1251; OUTPUT: RGB.R = RED component (0-63) ;AN000;
1252; RGB.G = GREEN component (0-63) ;AN000;
1253; RGB.B = BLUE component (0-63) ;AN000;
1254; ;AN000;
1255; CALLED BY: SET_UP_CGA_XLT_TABLE ;AN000;
1256; ;AN000;
1257;----------------------------------------------------------------------- ;AN000;
1258; ;AN000;
1259; DESCRIPTION: If either the RED, GREEN, or BLUE bit is on (in an IRGB ;AN000;
1260; byte) then, the corresponding color gun on the display is firing 2/3 ;AN000;
1261; of its capacity, giving a color intensity of "2/3". ;AN000;
1262; ;AN000;
1263; If the INTENSITY bit is on, then 1/3 is added to EACH color. ;AN000;
1264; ;AN000;
1265; (E.G., IRGB R G B ;AN000;
1266; BLACK = 00000000 ( 0, 0, 0) ;AN000;
1267; WHITE = 00001111 (3/3, 3/3, 3/3) ;AN000;
1268; RED = 00000100 (2/3, 0, 0) ;AN000;
1269; HIGH INT. RED = 00001100 (3/3, 1/3, 1/3) ;AN000;
1270; ;AN000;
1271; Since we want an intensity from 0 to 63, ;AN000;
1272; "2/3" of RED means: ;AN000;
1273; 2/3 * 63 = 42 ;AN000;
1274; ;AN000;
1275; ;AN000;
1276; LOGIC: ;AN000;
1277; Get the intensity. ;AN000;
1278; Get the red component ;AN000;
1279; Get the green component ;AN000;
1280; Get the blue component ;AN000;
1281; ;AN000;
1282CGA_COL2RGB PROC NEAR ;AN000;
1283;----------------------------------------------------------------------- ;AN000;
1284; ;AN000;
1285; Init the R,G,B values: ;AN000;
1286; ;AN000;
1287;----------------------------------------------------------------------- ;AN000;
1288 MOV RGB.R,0 ;AN000;
1289 MOV RGB.G,0 ;AN000;
1290 MOV RGB.B,0 ;AN000;
1291;----------------------------------------------------------------------- ;AN000;
1292; ;AN000;
1293; Test the Intensity bit: ;AN000;
1294; ;AN000;
1295;----------------------------------------------------------------------- ;AN000;
1296 .IF <BIT AL AND I_BIT_MASK> ; IF, I is on ;AN000;
1297 .THEN ;AN000;
1298 ADD RGB.R,ONE_THIRD ; Then, add one third to each ;AN000;
1299 ADD RGB.G,ONE_THIRD ; color. ;AN000;
1300 ADD RGB.B,ONE_THIRD ;AN000;
1301 .ENDIF ;AN000;
1302;----------------------------------------------------------------------- ;AN000;
1303; ;AN000;
1304; Test the RGB bits: ;AN000;
1305; ;AN000;
1306;----------------------------------------------------------------------- ;AN000;
1307 .IF <BIT AL AND R_BIT_MASK> ; If, Red is on ;AN000;
1308 .THEN ;AN000;
1309 ADD RGB.R,TWO_THIRD ; then, add two third RED ;AN000;
1310 .ENDIF ;AN000;
1311 ;AN000;
1312 .IF <BIT AL AND G_BIT_MASK> ; If, Green is on ;AN000;
1313 .THEN ;AN000;
1314 ADD RGB.G,TWO_THIRD ; then, add two third GREEN ;AN000;
1315 .ENDIF ;AN000;
1316 ;AN000;
1317 .IF <BIT AL AND B_BIT_MASK> ; If, Blue is on ;AN000;
1318 .THEN ;AN000;
1319 ADD RGB.B,TWO_THIRD ; then, add two third BLUE ;AN000;
1320 .ENDIF ;AN000;
1321 ;AN000;
1322 RET ;AN000;
1323CGA_COL2RGB ENDP ;AN000;
1324PAGE ;AN000;
1325;======================================================================= ;AN000;
1326; ;AN000;
1327; SET_MODE_F_XLT_TAB: SET UP COLOR TRANSLATION TABLE FOR MONOCHROME ;AN000;
1328; MODE "F" ;AN000;
1329; ;AN000;
1330;----------------------------------------------------------------------- ;AN000;
1331; ;AN000;
1332; INPUT: XLT_TAB = Color translation table. ;AN000;
1333; PRINTER_TYPE = Type of printer attached (Color or B&W) ;AN000;
1334; SWITCHES = GRAPHICS command line parameters. ;AN000;
1335; ;AN000;
1336; OUTPUT: XLT_TAB IS UPDATED ;AN000;
1337; ;AN000;
1338; CALLED BY: SET_UP_XLT_TABLE ;AN000;
1339; ;AN000;
1340;-------------------------------------------------------------------------------;AN000;
1341; ;AN000;
1342; NOTES: In mode F the "VIDEO BIOS READ DOT call" returns a byte where ;AN000;
1343; bit 1 and 3 represent the value of plane 1 and 3. ;AN000;
1344; The following colors are available using this mode: ;AN000;
1345; ;AN000;
1346; plane 2: plane 0: color: ;AN000;
1347; 0 0 black ;AN000;
1348; 0 1 white ;AN000;
1349; 1 0 blinking white ;AN000;
1350; 1 1 high-intensity white ;AN000;
1351; ;AN000;
1352; ;AN000;
1353; DESCRIPTION: A local table holds the Red, Green, Blue values for each of ;AN000;
1354; the 4 Mono colors available in Mode Fh. ;AN000;
1355; Each color is stored as either a Grey intensity if printing in Monochrome ;AN000;
1356; or as a Band Mask if printing in color. ;AN000;
1357; Black is stored as black. ;AN000;
1358; White is stored as a light gray ;AN000;
1359; High-intensity white and blinking white are stored as white. ;AN000;
1360; ;AN000;
1361; ;AN000;
1362; LOGIC: ;AN000;
1363; FOR EACH "COLOR" AVAILABLE WITH MODE F ;AN000;
1364; GET ITS R,G,B VALUES ;AN000;
1365; CALL RGB2XLT_TAB ; Convert RGB to an entry in the translation ;AN000;
1366; ; table ;AN000;
1367; ;AN000;
1368SET_MODE_F_XLT_TAB PROC NEAR ;AN000;
1369 PUSH AX ;AN000;
1370 PUSH SI ;AN000;
1371 PUSH DI ;AN000;
1372 JMP SHORT SET_MODE_F_BEGIN ;AN000;
1373;-------------------------------------------------------------------------------;AN000;
1374; ;AN000;
1375; TABLE OF R,G,B VALUES WE ASSIGN TO THE 4 COLORS AVAILABLE IN MODE F: ;AN000;
1376; ;AN000;
1377;-------------------------------------------------------------------------------;AN000;
1378MODE_F_RGB LABEL BYTE ;AN000;
1379 DB BLACK_INT,BLACK_INT,BLACK_INT ; Black is mapped to black. ;AN000;
1380 DB TWO_THIRD,TWO_THIRD,TWO_THIRD ; White --> light grey ;AN000;
1381 DB WHITE_INT,WHITE_INT,WHITE_INT ; Blinking --> white ;AN000;
1382 DB WHITE_INT,WHITE_INT,WHITE_INT ; High-int. White --> white ;AN000;
1383;-------------------------------------------------------------------------------;AN000;
1384; ;AN000;
1385; STORE THE COLORS AVAILABLE WITH MODE F ;AN000;
1386; ;AN000;
1387;-------------------------------------------------------------------------------;AN000;
1388SET_MODE_F_BEGIN: ;AN000;
1389 MOV SI,OFFSET MODE_F_RGB ; SI <-- Offset of RGB table ;AN000;
1390 XOR DI,DI ; DI <-- Index into translation table ;AN000;
1391 ;AN000;
1392;-------For each color available in mode F: ;AN000;
1393STORE_1_MODE_F_COLOR: ;AN000;
1394 MOV AL,[SI] ; Get the Red component ;AN000;
1395 MOV RGB.R,AL ;AN000;
1396 MOV AL,[SI]+1 ; Get the Green component ;AN000;
1397 MOV RGB.G,AL ;AN000;
1398 MOV AL,[SI]+2 ; Get the Blue component ;AN000;
1399 MOV RGB.B,AL ;AN000;
1400 ;AN000;
1401;-------Convert pixel to either a Color band or an Intensity: ;AN000;
1402 CALL RGB2XLT_TAB ; Convert and store in the xlt table ;AN000;
1403 ;AN000;
1404 ADD SI,3 ; Get next R,G,B values ;AN000;
1405 INC DI ; One more color has been stored ;AN000;
1406 CMP DI,NB_COLORS ; All stored ? ;AN000;
1407 JL STORE_1_MODE_F_COLOR ;AN000;
1408 ;AN000;
1409 POP DI ;AN000;
1410 POP SI ;AN000;
1411 POP AX ;AN000;
1412 RET ;AN000;
1413SET_MODE_F_XLT_TAB ENDP ;AN000;
1414PAGE ;AN000;
1415;======================================================================= ;AN000;
1416; ;AN000;
1417; SET_MODE_13H_XLT_TAB: SET UP COLOR TRANSLATION TABLE FOR PALACE VIDEO ;AN000;
1418; ADAPTER IN MODE 13H ;AN000;
1419; ;AN000;
1420;----------------------------------------------------------------------- ;AN000;
1421; ;AN000;
1422; INPUT: XLT_TAB = Color translation table. ;AN000;
1423; PRINTER_TYPE = Type of printer attached (Color or B&W) ;AN000;
1424; SWITCHES = GRAPHICS command line parameters. ;AN000;
1425; ;AN000;
1426; OUTPUT: XLT_TAB IS UPDATED ;AN000;
1427; ;AN000;
1428; CALLED BY: SET_UP_XLT_TABLE ;AN000;
1429; ;AN000;
1430;----------------------------------------------------------------------- ;AN000;
1431; ;AN000;
1432; NOTES: With the PALACE the "VIDEO BIOS READ DOT call" returns a direct ;AN000;
1433; index to the 256 COLOR REGISTERS. ;AN000;
1434; ;AN000;
1435; These COLORS REGISTERS hold the R,G,B (Red, Green, Blue) values for ;AN000;
1436; each of the 256 colors available at the same time on the screen. ;AN000;
1437; Color register number 0 holds the background color. ;AN000;
1438; ;AN000;
1439; DESCRIPTION: Store a color mapping for each color register. ;AN000;
1440; If the REVERSE_SW is off, exchange white and black. ;AN000;
1441; ;AN000;
1442; LOGIC: ;AN000;
1443; ;AN000;
1444; For each color (0 to 255) ;AN000;
1445; Read the color register ; get the RGB values for this color num. ;AN000;
1446; Store the result in the XLT_TAB ;AN000;
1447; ;AN000;
1448SET_MODE_13H_XLT_TAB PROC NEAR ;AN000;
1449 PUSH AX ;AN000;
1450 PUSH BX ;AN000;
1451 PUSH CX ;AN000;
1452 PUSH DX ;AN000;
1453 PUSH DI ;AN000;
1454 ;AN000;
1455 MOV NB_COLORS_TO_READ,256 ; Read 256 color registers ;AN000;
1456 ;AN000;
1457;-------------------------------------------------------------------------------;AN000;
1458; ;AN000;
1459; Store in the translation table each color available for mode 13h: ;AN000;
1460; ;AN000;
1461;-------------------------------------------------------------------------------;AN000;
1462 XOR DI,DI ; DI := Palette register number ;AN000;
1463 ; and index in the translation table ;AN000;
1464STORE_1_M13H_COLOR: ;AN000;
1465 MOV BX,DI ; BX := Color register to be read ;AN000;
1466 MOV AX,GET_C_REG_CALL ; AX := BIOS Get color register call ;AN000;
1467 INT 10H ; Call BIOS ;AN000;
1468 MOV RGB.R,DH ; Get Red value ;AN000;
1469 MOV RGB.G,CH ; Get Green value ;AN000;
1470 MOV RGB.B,CL ; Get Blue value ;AN000;
1471 CALL RGB2XLT_TAB ; Convert RGB to an entry in XLT_TAB ;AN000;
1472 INC DI ; Get next palette register number ;AN000;
1473 CMP DI,NB_COLORS_TO_READ ; All colors stored ? ;AN000;
1474 JL STORE_1_M13H_COLOR ; No, get next one ;AN000;
1475 ;AN000;
1476 ;AN000;
1477 POP DI ;AN000;
1478 POP DX ;AN000;
1479 POP CX ;AN000;
1480 POP BX ;AN000;
1481 POP AX ;AN000;
1482 RET ;AN000;
1483NB_COLORS_TO_READ DW ? ; Number of colors registers to read with a PS/2;AN000;
1484SET_MODE_13H_XLT_TAB ENDP ;AN000;
1485PAGE ;AN000;
1486;===============================================================================;AN000;
1487; ;AN000;
1488; SET_ROUNDUP_XLT_TAB: SET UP COLOR TRANSLATION TABLE FOR ROUNDUP VIDEO ;AN000;
1489; ADAPTER ;AN000;
1490; ;AN000;
1491;-------------------------------------------------------------------------------;AN000;
1492; ;AN000;
1493; INPUT: XLT_TAB = Color translation table. ;AN000;
1494; PRINTER_TYPE = Type of printer attached (Color or B&W) ;AN000;
1495; SWITCHES = GRAPHICS command line parameters. ;AN000;
1496; ;AN000;
1497; OUTPUT: XLT_TAB IS UPDATED ;AN000;
1498; ;AN000;
1499; CALLED BY: SET_UP_XLT_TABLE ;AN000;
1500; ;AN000;
1501;-------------------------------------------------------------------------------;AN000;
1502; ;AN000;
1503; NOTES: With the ROUNDUP the "VIDEO BIOS READ DOT call" returns an ;AN000;
1504; index into the 16 PALETTE REGISTERS. ;AN000;
1505; ;AN000;
1506; Each palette register holds an index into the current "color page" ;AN000;
1507; within the 256 COLOR REGISTERS. ;AN000;
1508; ;AN000;
1509; These "color pages" represent all the colors from WHICH TO CHOOSE the ;AN000;
1510; screen colors for an active page; 16 colors can be displayed at the ;AN000;
1511; same time on the screen. ;AN000;
1512; ;AN000;
1513; There are 2 paging modes: either 64 color pages or 16 color pages: ;AN000;
1514; ;AN000;
1515; In 64 color mode, there are 4 color pages available (the 256 palette ;AN000;
1516; registers are partitioned in 4 blocks of 64 colors). ;AN000;
1517; ;AN000;
1518; The 16 screen colors for the active page are selected from these 64 ;AN000;
1519; color registers. ;AN000;
1520; ;AN000;
1521; This scheme allows for quickly changing the contents of the screen by ;AN000;
1522; changing the active page. ;AN000;
1523; ;AN000;
1524; The COLOR REGISTERS contains the color information stored as RGB (Red, ;AN000;
1525; Green, Blue) components. There is one byte for each of these 3 ;AN000;
1526; components. The value for each component ranges from 0 to 63 (where ;AN000;
1527; 0 = color not present). ;AN000;
1528; ;AN000;
1529; ;AN000;
1530; DESCRIPTION: Determine the paging mode and the active color page. ;AN000;
1531; For each color available with the current mode, get the palette ;AN000;
1532; register and then, read the corresponding color register in order to ;AN000;
1533; obtain its RGB components. ;AN000;
1534; ;AN000;
1535; For mode 11h, 2 colors only are available. These colors are obtained from ;AN000;
1536; palette register 0 (background) and 7 (foreground color). The contents ;AN000;
1537; of these 2 palette registers is also used as an index within the color ;AN000;
1538; registers. ;AN000;
1539; ;AN000;
1540; If printing is Monochrome, map the RGB to a Grey Intensity. ;AN000;
1541; If printing is in colors, map the RGB to a Band Mask. ;AN000;
1542; Store the result in the translation table ;AN000;
1543; ;AN000;
1544; LOGIC: ;AN000;
1545; ;AN000;
1546; Read color page state (BIOS INT 10H - AL = 1AH) ;AN000;
1547; ;AN000;
1548; If mode 4,5 or 6 ;AN000;
1549; Then ;AN000;
1550; CALL SET_CGA_XLT_TAB ;AN000;
1551; Adjust the background color. ;AN000;
1552; else ;AN000;
1553; If mode 11h ;AN000;
1554; then ;AN000;
1555; For PALETTE_INDEX := 0 to 15 ;AN000;
1556; IF PAGE_MODE = PAGE_64_REGISTERS ;AN000;
1557; THEN ;AN000;
1558; Read the palette register number "PALETTE_INDEX" ;AN000;
1559; COLOR_INDEX := Palette register contents ;AN000;
1560; COLOR_INDEX := (CUR_PAGE_NUM * 64) + COLOR_INDEX ;AN000;
1561; Read color register number "COLOR_INDEX" ; Obtain R,G,B values. ;AN000;
1562; CALL RGB2XLT_TAB ; Convert RGB to an entry in XLT_TAB ;AN000;
1563; ;AN000;
1564; ELSE IF PAGE_MODE = PAGE_16_REGISTERS ;AN000;
1565; COLOR_INDEX := (CUR_PAGE_NUM * 16) + PALETTE_INDEX ;AN000;
1566; Read color register number "COLOR_INDEX" ;AN000;
1567; CALL RGB2XLT_TAB ; Convert RGB to an entry in XLT_TAB ;AN000;
1568; ;AN000;
1569; ;AN000;
1570SET_ROUNDUP_XLT_TAB PROC NEAR ;AN000;
1571PAGING_MODE_64 EQU 0 ;AN000;
1572 ;AN000;
1573 PUSH AX ;AN000;
1574 PUSH BX ;AN000;
1575 PUSH CX ;AN000;
1576 PUSH DI ;AN000;
1577 ;AN000;
1578;-------------------------------------------------------------------------------;AN000;
1579; Obtain the color page state ;AN000;
1580;-------------------------------------------------------------------------------;AN000;
1581 MOV AX,PAGE_STATE_CALL ; Call BIOS ;AN000;
1582 INT 10H ; BL := Paging mode ;AN000;
1583 ; BH := Current page ;AN000;
1584 ;AN000;
1585;-------------------------------------------------------------------------------;AN000;
1586; Check the video mode: ;AN000;
1587;-------------------------------------------------------------------------------;AN000;
1588.SELECT ;AN000;
1589.WHEN <CUR_MODE EQ 4> OR ; If the current mode is an old CGA ;AN000;
1590.WHEN <CUR_MODE EQ 5> OR ; mode: ;AN000;
1591.WHEN <CUR_MODE EQ 6> ; ;AN000;
1592;-------------------------------------------------------------------------------;AN000;
1593; ;AN000;
1594; Old CGA graphics mode (mode 4, 5 or 6) ;AN000;
1595; ;AN000;
1596;-------------------------------------------------------------------------------;AN000;
1597;-------------------------------------------------------------------------------;AN000;
1598; Store colors of the old CGA modes: ;AN000;
1599;-------------------------------------------------------------------------------;AN000;
1600 CALL SET_CGA_XLT_TAB ; Set up colors in the translation ;AN000;
1601 ; table, NOTE: The background color ;AN000;
1602 ; will not be set properly since the ;AN000;
1603 ; PS/2 BIOS does not update memory ;AN000;
1604 ; location 40:66 with the value ;AN000;
1605 ; of the background color as CGA ;AN000;
1606 ; does for modes 4 and 5. However ;AN000;
1607 ; 40:66 holds the current palette;AN000;
1608 ; selected. ;AN000;
1609;-------------------------------------------------------------------------------;AN000;
1610; Adjust the background color for modes 4,5 or 6 ;AN000;
1611;-------------------------------------------------------------------------------;AN000;
1612 MOV PAL_REGISTER_NB,0 ; Read the palette register number 0 ;AN000;
1613 CALL GET_PALETTE_RGB ; this register points to the color ;AN000;
1614 ; register that contains the RGB ;AN000;
1615 ; values of the BACKGROUND color. ;AN000;
1616 MOV DI,0 ; DI := Index in the translation table ;AN000;
1617 CALL RGB2XLT_TAB ; Store mapping in the translation table;AN000;
1618 ;AN000;
1619.WHEN <CUR_MODE EQ 11H> ;AN000;
1620;-------------------------------------------------------------------------------;AN000;
1621; ;AN000;
1622; Mode 11h (2 colors out of 256,000 colors) ;AN000;
1623; ;AN000;
1624;-------------------------------------------------------------------------------;AN000;
1625;-------------------------------------------------------------------------------;AN000;
1626; Get the background color: ;AN000;
1627;-------------------------------------------------------------------------------;AN000;
1628 MOV PAL_REGISTER_NB,0 ; Read the palette register number 0 ;AN000;
1629 CALL GET_PALETTE_RGB ; Get the RGB values for this color ;AN000;
1630 MOV DI,0 ; DI := Index in translation table ;AN000;
1631 CALL RGB2XLT_TAB ; Store mapping in the translation table;AN000;
1632;-------------------------------------------------------------------------------;AN000;
1633; Get the foreground color: ;AN000;
1634;-------------------------------------------------------------------------------;AN000;
1635 MOV PAL_REGISTER_NB,7 ; Read the palette register for the ;AN000;
1636 ; FOREGROUND color (palette register 7);AN000;
1637 CALL GET_PALETTE_RGB ; Get the RGB values for this color ;AN000;
1638 MOV DI,1 ; DI := Index in translation table ;AN000;
1639 CALL RGB2XLT_TAB ; Store mapping in the translation table;AN000;
1640.OTHERWISE ;AN000;
1641;-------------------------------------------------------------------------------;AN000;
1642; ;AN000;
1643; The current mode is a 16 color mode ;AN000;
1644; ;AN000;
1645;-------------------------------------------------------------------------------;AN000;
1646 XOR DI,DI ; DI := Index in translation table ;AN000;
1647 MOV CX,16 ; 16 colors to read and store ;AN000;
1648 MOV PAL_REGISTER_NB,0 ; Palette register to read ;AN000;
1649STORE_1_PS2_COLOR: ;AN000;
1650 CALL GET_PALETTE_RGB ; Get the RGB values for this color ;AN000;
1651; ;AN000;
1652;-------Convert the RGB values to band mask or intensity and store in XLT_TAB: ;AN000;
1653 ;AN000;
1654 CALL RGB2XLT_TAB ; Store mapping in the translation table;AN000;
1655 INC DI ; Get next palette register number ;AN000;
1656 INC PAL_REGISTER_NB ; ;AN000;
1657 LOOP STORE_1_PS2_COLOR ; Read it. ;AN000;
1658.ENDSELECT ;AN000;
1659 ;AN000;
1660 POP DI ;AN000;
1661 POP CX ;AN000;
1662 POP BX ;AN000;
1663 POP AX ;AN000;
1664 RET ;AN000;
1665PAL_REGISTER_NB DB ? ; Number of the palette register to read;AN000;
1666SET_ROUNDUP_XLT_TAB ENDP ;AN000;
1667 ;AN000;
1668PAGE ;AN000;
1669;===============================================================================;AN000;
1670; ;AN000;
1671; GET_PALETTE_RGB: ON THE PS/2 MODEL 50, 60 AND 80, GET THE RGB VALUES FOR A ;AN000;
1672; PALETTE REGISTER BY READING THE CORRESPONDING COLOR REGISTER;AN000;
1673; ;AN000;
1674;-------------------------------------------------------------------------------;AN000;
1675; ;AN000;
1676; INPUT: PAL_REGISTER_NB = Palette register number ;AN000;
1677; BH = Current page number ;AN000;
1678; BL = Current paging mode ;AN000;
1679; ;AN000;
1680; OUTPUT: RGB.R = The RGB values obtained from the color register;AN000;
1681; RGB.G corresponding to the palette register specified;AN000;
1682; RGB.B ;AN000;
1683; ;AN000;
1684; CALLED BY: SET_ROUNDUP_XLT_TAB ;AN000;
1685; ;AN000;
1686;-------------------------------------------------------------------------------;AN000;
1687GET_PALETTE_RGB PROC ;AN000;
1688 PUSH AX ;AN000;
1689 PUSH BX ;AN000;
1690 PUSH CX ;AN000;
1691 PUSH DX ;AN000;
1692 PUSH SI ;AN000;
1693 ;AN000;
1694 MOV AL,BH ; SI := Current page number ;AN000;
1695 CBW ; ;AN000;
1696 MOV SI,AX ; ;AN000;
1697;-------------------------------------------------------------------------------;AN000;
1698; ;AN000;
1699; Calculte the absolute number of the first Color Register for the current page:;AN000;
1700; (calculated in SI) ;AN000;
1701; ;AN000;
1702;-------------------------------------------------------------------------------;AN000;
1703.IF <BL EQ PAGING_MODE_64> ; If mode is 64 Color page ;AN000;
1704.THEN ; then ;AN000;
1705 MOV CL,6 ; SI := Current page num * 64 ;AN000;
1706 SHL SI,CL ; ;AN000;
1707.ELSE ; else, Mode is 16 Color page ;AN000;
1708 MOV CL,4 ; SI := Current page num * 16 ;AN000;
1709 SHL SI,CL ; ;AN000;
1710.ENDIF ;AN000;
1711 ;AN000;
1712; ;AN000;
1713;-------Read the PALETTE REGISTER ;AN000;
1714 MOV BL,PAL_REGISTER_NB ; BL := Palette register to be read ;AN000;
1715 MOV AX,GET_P_REG_CALL ; Read palette register call ;AN000;
1716 INT 10H ; Call BIOS, ;AN000;
1717 ; BH := Color register index ;AN000;
1718 ; WITHIN the current page and is;AN000;
1719 ; either (0-15) or (0-63) ;AN000;
1720 ; NOTE: SI = Absolute index (0-255) to ;AN000;
1721 ; the first color register of the ;AN000;
1722 ; current page and is a multiple of ;AN000;
1723 ; either 16 or 64 ;AN000;
1724 MOV BL,BH ; BX := Index within current color page ;AN000;
1725 XOR BH,BH ; ;AN000;
1726 ;AN000;
1727; ;AN000;
1728;-------Read the Color register: ;AN000;
1729 OR BX,SI ; BX := Index of Color register to read ;AN000;
1730 MOV AX,GET_C_REG_CALL ; Read the color register ;AN000;
1731 INT 10H ; Call BIOS, ;AN000;
1732 MOV RGB.R,DH ; DH := Red value read ;AN000;
1733 MOV RGB.G,CH ; CH := Green value read ;AN000;
1734 MOV RGB.B,CL ; CL := Blue value read ;AN000;
1735 ;AN000;
1736 POP SI ;AN000;
1737 POP DX ;AN000;
1738 POP CX ;AN000;
1739 POP BX ;AN000;
1740 POP AX ;AN000;
1741 RET ;AN000;
1742GET_PALETTE_RGB ENDP ;AN000;
1743PAGE ;AN000;
1744;======================================================================= ;AN000;
1745; ;AN000;
1746; EGA_COL2RGB : CONVERT A COLOR FROM THE EGA TO RED GREEN BLUE VALUES ;AN000;
1747; ;AN000;
1748;----------------------------------------------------------------------- ;AN000;
1749; ;AN000;
1750; INPUT: AL = 00rgbRGB ONE BYTE WHERE BIT: ;AN000;
1751; ;AN000;
1752; r = 1/3 of Red component ;AN000;
1753; g = 1/3 of Green component ;AN000;
1754; b = 1/3 of Blue component ;AN000;
1755; R = 2/3 of Red component ;AN000;
1756; G = 2/3 of Green component ;AN000;
1757; B = 3/3 of Blue component ;AN000;
1758; ;AN000;
1759; ;AN000;
1760; OUTPUT: RGB.R = RED component (0-63) ;AN000;
1761; RGB.G = GREEN component (0-63) ;AN000;
1762; RGB.B = BLUE component (0-63) ;AN000;
1763; ;AN000;
1764; CALLED BY: SET_UP_EGA_XLT_TABLE ;AN000;
1765; ;AN000;
1766;----------------------------------------------------------------------- ;AN000;
1767; ;AN000;
1768; DESCRIPTION: Sums up the values for each color component. ;AN000;
1769; "2/3 of RED" means that the red gun in the display attached to the EGA ;AN000;
1770; is firing at 2/3 of full intensity. ;AN000;
1771; ;AN000;
1772; Since the color intensities range from 0 to 63, "1/3" means an ;AN000;
1773; intensity of: ;AN000;
1774; 1/3 * 63 = 21 ;AN000;
1775; ;AN000;
1776; LOGIC: ;AN000;
1777; ;AN000;
1778; Get the red component ;AN000;
1779; Get the green component ;AN000;
1780; Get the blue component ;AN000;
1781; ;AN000;
1782EGA_COL2RGB PROC NEAR ;AN000;
1783; ;AN000;
1784;-------Get the RED component (bit 5 and 2) ;AN000;
1785; ;AN000;
1786;-------Check bit 2 ;AN000;
1787 MOV RGB.R,0 ;AN000;
1788 TEST AL,100B ; "R" is on ? ;AN000;
1789 JZ CHECK_BIT_5 ; No, check "r" ;AN000;
1790 ADD RGB.R,TWO_THIRD ; Yes, add 2/3 RED ;AN000;
1791CHECK_BIT_5: ;AN000;
1792 TEST AL,100000B ; "r" is on ? ;AN000;
1793 JZ CHECK_BIT_1 ; No, check Green ;AN000;
1794 ADD RGB.R,ONE_THIRD ; Yes, add 1/3 RED ;AN000;
1795; ;AN000;
1796;-------Get the GREEN component (bit 4 and 1) ;AN000;
1797; ;AN000;
1798CHECK_BIT_1: ;AN000;
1799 MOV RGB.G,0 ;AN000;
1800 TEST AL,10B ; "G" is on ? ;AN000;
1801 JZ CHECK_BIT_4 ; No, check "g" ;AN000;
1802 ADD RGB.G,TWO_THIRD ; Yes, add 2/3 GREEN ;AN000;
1803CHECK_BIT_4: ;AN000;
1804 TEST AL,10000B ; "g" is on ? ;AN000;
1805 JZ CHECK_BIT_0 ; No, check for Blue ;AN000;
1806 ADD RGB.G,ONE_THIRD ; Yes, add 1/3 GREEN ;AN000;
1807; ;AN000;
1808;-------Get the BLUE component (bit 3 and 0) ;AN000;
1809; ;AN000;
1810CHECK_BIT_0: ;AN000;
1811 MOV RGB.B,0 ;AN000;
1812 TEST AL,1B ; "B" is on ? ;AN000;
1813 JZ CHECK_BIT_3 ; No, check "b" ;AN000;
1814 ADD RGB.B,TWO_THIRD ; Yes, add 2/3 BLUE ;AN000;
1815CHECK_BIT_3: ;AN000;
1816 TEST AL,1000B ; "b" is on ? ;AN000;
1817 JZ EGA_COL2RGB_RETURN ; No, return ;AN000;
1818 ADD RGB.B,ONE_THIRD ; Yes, add 1/3 BLUE ;AN000;
1819EGA_COL2RGB_RETURN: ;AN000;
1820 RET ;AN000;
1821EGA_COL2RGB ENDP ;AN000;
1822 ;AN000;
1823PAGE ;AN000;
1824;===============================================================================;AN000;
1825; ;AN000;
1826; RGB2INT : MAP RED GREEN BLUE VALUES TO AN INTENSITY. ;AN000;
1827; ;AN000;
1828;-------------------------------------------------------------------------------;AN000;
1829; ;AN000;
1830; INPUT: RGB.R = A RED value (0-63) ;AN000;
1831; RGB.G = A GREEN value (0-63) ;AN000;
1832; RGB.B = A BLUE value (0-63) ;AN000;
1833; DARKADJUST_VALUE= THE DARKNESS VALUE (In shared data area). ;AN000;
1834; SWITCHES = Command line switches ;AN000;
1835; ;AN000;
1836; OUTPUT: AL = THE INTENSITY (0-63) NOTE: 0 = BLACK ;AN000;
1837; 63 = BRIGHT WHITE ;AN000;
1838; ;AN000;
1839; WARNING: AH IS LOST ;AN000;
1840; ;AN000;
1841;-------------------------------------------------------------------------------;AN000;
1842; ;AN000;
1843; DESCRIPTION: When the RGB values for a pixel are at their maximum ;AN000;
1844; value, what we obtain is a bright white pixel on the screen; this is ;AN000;
1845; the brightest color achievable and therefore, its intensity is 63. ;AN000;
1846; ;AN000;
1847; When no color gun is firing on the display: RGB values are 0,0,0 this ;AN000;
1848; is no color at all and therefore maps to intensity 0. ;AN000;
1849; ;AN000;
1850; For intermediate colors, experimentation has shown that the eye will ;AN000;
1851; see blue as darker than red and red as darker than green. ;AN000;
1852; ;AN000;
1853; On a grey rainbow from 0 - 10 where 0 is black and 10 is white: ;AN000;
1854; ;AN000;
1855; Blue corresponds to a grey of intensity 1 ;AN000;
1856; Red corresponds to a grey of intensity 3 ;AN000;
1857; Green corresponds to a grey of intensity 6 ;AN000;
1858; ;AN000;
1859; Therefore, if we mix all 3 colors we obtain a grey of ;AN000;
1860; intensity 1 + 3 + 6 = 10 (i.e.,white). ;AN000;
1861; ;AN000;
1862; ;AN000;
1863; LOGIC: ;AN000;
1864; ;AN000;
1865; Calculate the intensity ;AN000;
1866; ;AN000;
1867; AL = (.6 * G) + (.3 * R) + (.1 * B) ;AN000;
1868; ;AN000;
1869; Adjust Darkness ;AN000;
1870; ;AN000;
1871; AL = AL + DARKADJUST_VALUE ;AN000;
1872; ;AN000;
1873RGB2INT PROC NEAR ;AN000;
1874 PUSH BX ;AN000;
1875 PUSH CX ;AN000;
1876 PUSH DX ;AN000;
1877 ;AN000;
1878 XOR AX,AX ; AL := Current component intensity ;AN000;
1879 XOR BX,BX ; BX is used for calculations ;AN000;
1880 XOR DX,DX ; DL := Running sum for grey intensity ;AN000;
1881 ;AN000;
1882;-------Process /R (Reverse black and white) ;AN000;
1883.IF <BIT DS:[BP].SWITCHES Z REVERSE_SW> ; IF reverse is OFF ;AN000;
1884.THEN ; THEN REVERSE BLACK AND WHITE: ;AN000;
1885;-------Test if the color is BLACK ;AN000;
1886 .IF <RGB.R EQ BLACK_INT> AND ; If black ;AN000;
1887 .IF <RGB.G EQ BLACK_INT> AND ; ;AN000;
1888 .IF <RGB.B EQ BLACK_INT> ; ;AN000;
1889 .THEN ; then, replace it with white ;AN000;
1890 MOV AL,WHITE_INT ;AN000;
1891 JMP SHORT RGB2INT_END ;AN000;
1892 .ELSEIF <RGB.R EQ WHITE_INT> AND ; else if, high-intensity white ;AN000;
1893 .IF <RGB.G EQ WHITE_INT> AND ; ;AN000;
1894 .IF <RGB.B EQ WHITE_INT> ; ;AN000;
1895 .THEN ; then, replace it with black ;AN000;
1896 MOV AL,BLACK_INT ;AN000;
1897 JMP SHORT RGB2INT_END ;AN000;
1898 .ELSEIF <RGB.R EQ TWO_THIRD> AND ; else if, white ;AN000;
1899 .IF <RGB.G EQ TWO_THIRD> AND ; ;AN000;
1900 .IF <RGB.B EQ TWO_THIRD> ; ;AN000;
1901 .THEN ; then, replace it with black ;AN000;
1902 MOV AL,BLACK_INT ;AN000;
1903 JMP SHORT RGB2INT_END ;AN000;
1904 .ENDIF ;AN000;
1905.ENDIF ;AN000;
1906 ;AN000;
1907;-------Calculate Green component ;AN000;
1908 MOV AL,RGB.G ; AL := Green component ;AN000;
1909 MOV BH,6 ; ;AN000;
1910 MUL BH ; AX := Green * 6 ;AN000;
1911 MOV BH,10 ; ;AN000;
1912 DIV BH ; AL := (GREEN * 6) / 10 ;AN000;
1913 ADD DL,AL ; DL := Cumulative intensity ;AN000;
1914 MOV CH,AH ; CH := Cumulative remainder ;AN000;
1915 ;AN000;
1916;-------Calculate Red component ;AN000;
1917 MOV AL,RGB.R ; AL := Red component ;AN000;
1918 MOV BH,3 ; ;AN000;
1919 MUL BH ; AX := Red * 3 ;AN000;
1920 MOV BH,10 ; ;AN000;
1921 DIV BH ; AL := (RED * 3) / 10 ;AN000;
1922 ADD DL,AL ; DL := Cumulative intensity ;AN000;
1923 ADD CH,AH ; CH := Cumulative remainder ;AN000;
1924 ;AN000;
1925;-------Calculate Blue component ;AN000;
1926 MOV AL,RGB.B ; AX := Blue component ;AN000;
1927 XOR AH,AH ; ;AN000;
1928 DIV BH ; AL := BLUE / 10 ;AN000;
1929 ADD DL,AL ; DL := Cumulative intensity ;AN000;
1930 ADD CH,AH ; CH := Cumulative remainder ;AN000;
1931 ;AN000;
1932;-------Adjust intensity with cumulative remainder ;AN000;
1933 XOR AX,AX ;AN000;
1934 MOV AL,CH ; AX := Cumulative remainder ;AN000;
1935 MOV BH,10 ; BH := 10 ;AN000;
1936 DIV BH ; AL := Total remainder / 10 ;AN000;
1937 ADD DL,AL ; DL := Cumulative intensity ;AN000;
1938 .IF <AH GT 4> ; If remainder > 4 ;AN000;
1939 .THEN ; Then, add 1 ;AN000;
1940 INC DL ; to the intensity ;AN000;
1941 .ENDIF ;AN000;
1942 ;AN000;
1943;-------Adjust darkness ;AN000;
1944 ADD DL,DS:[BP].DARKADJUST_VALUE ;AN000;
1945 ;AN000;
1946;-------Return result ;AN000;
1947 MOV AL,DL ; AL := sum of R,G,B intensities ;AN000;
1948 ;AN000;
1949RGB2INT_END: ;AN000;
1950 POP DX ;AN000;
1951 POP CX ;AN000;
1952 POP BX ;AN000;
1953 RET ;AN000;
1954RGB2INT ENDP ;AN000;
1955 ;AN000;
1956PAGE ;AN000;
1957;============================================================================== ;AN000;
1958; ;AN000;
1959; RGB2BAND: MAP RED GREEN BLUE VALUES TO A "SELECT COLOR BAND" MASK FOR ;AN000;
1960; THE COLOR PRINTER. ;AN000;
1961; ;AN000;
1962;------------------------------------------------------------------------------ ;AN000;
1963; ;AN000;
1964; INPUT: RGB.R = A RED value (0-63) ;AN000;
1965; RGB.G = A GREEN value (0-63) ;AN000;
1966; RGB.B = A BLUE value (0-63) ;AN000;
1967; BP = Offset of the Shared Data Area. ;AN000;
1968; ;AN000;
1969; OUTPUT: AL = The Band Mask, one byte where: ;AN000;
1970; ;AN000;
1971; bit 0 = Color Band 1 is needed ;AN000;
1972; bit 1 = Color Band 2 is needed ;AN000;
1973; bit 2 = Color Band 3 is needed ;AN000;
1974; bit 3 = Color Band 4 is needed ;AN000;
1975; ;AN000;
1976; ;AN000;
1977; CALLED BY: SET_CGA_XLT_TAB ;AN000;
1978; SET_EGA_XLT_TAB ;AN000;
1979; SET_ROUNDUP_XLT_TAB ;AN000;
1980; SET_MODE_13H_XLT_TAB ;AN000;
1981; SET_MODE_F_XLT_TAB ;AN000;
1982; ;AN000;
1983;------------------------------------------------------------------------------ ;AN000;
1984; ;AN000;
1985; NOTES: The RGB values in input describe a color from the screen. ;AN000;
1986; Up to 256K different colors can be described with these RGB values. ;AN000;
1987; ;AN000;
1988; On the color printer, the print ribbon is composed of 4 color bands, ;AN000;
1989; each of a different color. By overlapping these 4 bands when ;AN000;
1990; printing, more colors can be obtained. However, the number of colors ;AN000;
1991; that can be achieved by overlapping print bands is very limited (4 or ;AN000;
1992; 8 colors). ;AN000;
1993; ;AN000;
1994; THIS MODULE SELECT THE PRINTER COLOR THAT IS THE CLOSEST TO THE ;AN000;
1995; DESIRED SCREEN COLOR. ;AN000;
1996; ;AN000;
1997; The Band Mask specifies which color bands have to be overlapped to ;AN000;
1998; obtain a color on the printer. ;AN000;
1999; ;AN000;
2000; ;AN000;
2001; DESCRIPTION: Go through the list of printer colors in the SHARED DATA ;AN000;
2002; AREA, for each of these colors, compare its RGB values with those in ;AN000;
2003; input. ;AN000;
2004; Get the BAND_MASK of the closest printer color. ;AN000;
2005; ;AN000;
2006; LOGIC: ;AN000;
2007; ;AN000;
2008; Locate the printer colors info structure in the shared data area: ;AN000;
2009; COLORPRINT_PTR := BP + COLORPRINT_PTR ;AN000;
2010; ;AN000;
2011; Get the number of printer colors from the COLORPRINT info in the Shared ;AN000;
2012; data area: ;AN000;
2013; Number of colors := COLORPRINT_PTR.NUM_PRT_COLOR ;AN000;
2014; ;AN000;
2015; CURRENT_COLOR_PTR : First record in the COLORPRINT info structure ;AN000;
2016; BEST_CHOICE := CURRENT_RECORD_PTR.BAND_MASK ;AN000;
2017; MIN_DIFF := Maximum positive value ;AN000;
2018; ;AN000;
2019; FOR each printer color: ;AN000;
2020; CUR_DIFF := 0 ;AN000;
2021; (* Calculate the geometric distance between the RGB values from the *) ;AN000;
2022; (* input and those of the printer color. *) ;AN000;
2023; Red difference := (R - CURRENT_COLOR_PTR.RED) ;AN000;
2024; Red difference := Red difference * Red difference ;AN000;
2025; CUR_DIFF := CUR_DIFF + Red difference ;AN000;
2026; ;AN000;
2027; Green difference := (G - CURRENT_COLOR_PTR.GREEN) ;AN000;
2028; Green difference := Green difference * Green difference ;AN000;
2029; CUR_DIFF := CUR_DIFF + Green difference ;AN000;
2030; ;AN000;
2031; Blue difference := (B - CURRENT_COLOR_PTR.BLUE) ;AN000;
2032; Blue difference := Blue difference * Blue difference ;AN000;
2033; CUR_DIFF := CUR_DIFF + Blue difference ;AN000;
2034; ;AN000;
2035; IF CUR_DIFF < MIN_DIFF ;AN000;
2036; THEN BEGIN ;AN000;
2037; MIN_DIFF := CUR_DIFF ;AN000;
2038; BEST_CHOICE := printer color.BAND_MASK ;AN000;
2039; END ;AN000;
2040; ;AN000;
2041; CURRENT_COLOR_PTR := Offset of next color ;AN000;
2042; END (For each printer color) ;AN000;
2043; ;AN000;
2044; Return BEST_CHOICE ;AN000;
2045; ;AN000;
2046; ;AN000;
2047RGB2BAND PROC NEAR ;AN000;
2048 PUSH AX ;AN000;
2049 PUSH BX ;AN000;
2050 PUSH CX ;AN000;
2051 PUSH DX ;AN000;
2052 ;AN000;
2053;-------Process /R (Reverse black and white) ;AN000;
2054.IF <BIT DS:[BP].SWITCHES Z REVERSE_SW> ; IF reverse is OFF ;AN000;
2055.THEN ; THEN REVERSE BLACK AND WHITE: ;AN000;
2056;------------------------------------------------------------------------------ ;AN000;
2057; ;AN000;
2058; REVERSE BLACK AND WHITE: ;AN000;
2059; ;AN000;
2060;------------------------------------------------------------------------------ ;AN000;
2061;-------Test if the color is BLACK ;AN000;
2062 .IF <RGB.R EQ BLACK_INT> AND ; If black ;AN000;
2063 .IF <RGB.G EQ BLACK_INT> AND ; ;AN000;
2064 .IF <RGB.B EQ BLACK_INT> ; ;AN000;
2065 .THEN ; then, replace it with the ;AN000;
2066 MOV BEST_CHOICE,0 ; band mask for white ;AN000;
2067 JMP RGB2BAND_END ; return this band mask ;AN000;
2068 .ELSEIF <RGB.R EQ WHITE_INT> AND ; else if, high-intensity white ;AN000;
2069 .IF <RGB.G EQ WHITE_INT> AND ; ;AN000;
2070 .IF <RGB.B EQ WHITE_INT> ; ;AN000;
2071 .THEN ; then, replace it with the ;AN000;
2072 MOV RGB.R,BLACK_INT ; RGB values of black ;AN000;
2073 MOV RGB.G,BLACK_INT ;AN000;
2074 MOV RGB.B,BLACK_INT ;AN000;
2075 .ELSEIF <RGB.R EQ TWO_THIRD> AND ; else if, white ;AN000;
2076 .IF <RGB.G EQ TWO_THIRD> AND ; ;AN000;
2077 .IF <RGB.B EQ TWO_THIRD> ; ;AN000;
2078 .THEN ; then, replace it with the ;AN000;
2079 MOV RGB.R,BLACK_INT ; RGB values of black ;AN000;
2080 MOV RGB.G,BLACK_INT ;AN000;
2081 MOV RGB.B,BLACK_INT ;AN000;
2082 .ENDIF ;AN000;
2083.ENDIF ;AN000;
2084;------------------------------------------------------------------------------ ;AN000;
2085; ;AN000;
2086; CALCULATE THE GEOMETRIC DISTANCE BETWEEN THE COLORS OF THE PIXEL AND THOSE OF ;AN000;
2087; THE PRINTER: ;AN000;
2088; ;AN000;
2089;------------------------------------------------------------------------------ ;AN000;
2090 MOV BX,DS:[BP].COLORPRINT_PTR ; BX := OFFSET of COLORPRINT ;AN000;
2091 ADD BX,BP ;AN000;
2092 MOV MIN_DIFF,7FFFh ; No match yet, minimum diff. ;AN000;
2093 ; is maximum POSITIVE value. ;AN000;
2094 XOR CX,CX ;AN000;
2095 MOV CL,DS:[BP].NUM_PRT_COLOR ; CX := Number of print colors ;AN000;
2096 ;AN000;
2097 ;AN000;
2098INSPECT_1_PRINT_COLOR: ;AN000;
2099 MOV CUR_DIFF,0 ; Current difference := 0 ;AN000;
2100;------------------------------------------------------------------------------ ;AN000;
2101; Calculate the Red difference: ;AN000;
2102;------------------------------------------------------------------------------ ;AN000;
2103 MOV AL,RGB.R ;AN000;
2104 SUB AL,[BX].RED ;AN000;
2105;-------Elevate at the power of two ;AN000;
2106 MOV DL,AL ; DX := Red difference ;AN000;
2107 IMUL DL ; AX := Red diff. square ;AN000;
2108 ADD CUR_DIFF,AX ; CURR_DIF + Red diff. ;AN000;
2109 ;AN000;
2110;------------------------------------------------------------------------------ ;AN000;
2111; Calculate the Green difference: ;AN000;
2112;------------------------------------------------------------------------------ ;AN000;
2113 MOV AL,RGB.G ;AN000;
2114 SUB AL,[BX].GREEN ;AN000;
2115;-------Elevate at the power of two ;AN000;
2116 MOV DL,AL ; DX := Red difference ;AN000;
2117 IMUL DL ; AX := Red diff. square ;AN000;
2118 ADD CUR_DIFF,AX ; CURR_DIF + Green diff. ;AN000;
2119 ;AN000;
2120;------------------------------------------------------------------------------ ;AN000;
2121; Calculate the Blue difference: ;AN000;
2122;------------------------------------------------------------------------------ ;AN000;
2123 MOV AL,RGB.B ;AN000;
2124 SUB AL,[BX].BLUE ;AN000;
2125;-------Elevate at the power of two ;AN000;
2126 MOV DL,AL ; DX := Red difference ;AN000;
2127 IMUL DL ; AX := Red diff. square ;AN000;
2128 ADD CUR_DIFF,AX ; CURR_DIF + Blue diff. ;AN000;
2129 ;AN000;
2130;------------------------------------------------------------------------------ ;AN000;
2131; Check how close is this print color to the screen color: ;AN000;
2132;------------------------------------------------------------------------------ ;AN000;
2133 MOV AX,CUR_DIFF ; If this color is better than what we ;AN000;
2134 .IF <AX L MIN_DIFF> ; had before. ;AN000;
2135 .THEN ; ;AN000;
2136 MOV MIN_DIFF,AX ; then, new minimum distance; ;AN000;
2137 MOV AL,[BX].SELECT_MASK ; get its band mask. ;AN000;
2138 MOV BEST_CHOICE,AL ; ;AN000;
2139 .ENDIF ; ;AN000;
2140 ;AN000;
2141;------------------------------------------------------------------------------ ;AN000;
2142; Get offset of next COLORPRINT info record: ;AN000;
2143;------------------------------------------------------------------------------ ;AN000;
2144 ADD BX,SIZE COLORPRINT_STR ;AN000;
2145 LOOP INSPECT_1_PRINT_COLOR ;AN000;
2146 ;AN000;
2147;------------------------------------------------------------------------------ ;AN000;
2148; BEST_CHOICE contains the print color with the closest RGB values ;AN000;
2149;------------------------------------------------------------------------------ ;AN000;
2150RGB2BAND_END: ;AN000;
2151 POP DX ;AN000;
2152 POP CX ;AN000;
2153 POP BX ;AN000;
2154 POP AX ;AN000;
2155 MOV AL,BEST_CHOICE ;AN000;
2156 RET ;AN000;
2157BEST_CHOICE DB ? ;AN000;
2158MIN_DIFF DW ? ;AN000;
2159CUR_DIFF DW ? ;AN000;
2160RGB2BAND ENDP ;AN000;
2161CODE ENDS ;AN000;
2162 END ;AN000;
HIC SVNT DRACONES