Liren Large Software Subsidy 10

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Text File | 1992-08-19 | 14.7 KB | 520 lines

; ------------------------------------------------------------------------ ; Assembly language routines for the Visual Basic for MS-DOS ; Presentation Graphics ToolKit. ; ; fl_SetBltDir - Sets bltchar direction increments ; fl_SetBltColor - Sets color parameter for bltchar ; fl_SetBltParams - Sets font related parameters for bltchar ; fl_BltChar - Character output routine ; ; fl_MovMem - Moves memory ; fl_ansi - Maps IBM chars to Windows ANSI; ; ; Copyright (C) 1982-1992 Microsoft Corporation ; ; You have a royalty-free right to use, modify, reproduce ; and distribute the sample applications and toolkits provided with ; Visual Basic for MS-DOS (and/or any modified version) ; in any way you find useful, provided that you agree that ; Microsoft has no warranty, obligations or liability for ; any of the sample applications or toolkits. ; ------------------------------------------------------------------------ .MODEL MEDIUM ; BASIC Procedures EXTRN B$N1I2:far, B$PSTC:far ; BltChar data block .DATA ; These are set by fl_SetBltParams HdrLen dw 0 ;length of windows font file header CharHeight dw 0 ;character height FirstChar dw 0 ;first character defined in font LastChar dw 0 ;last character defined in font DefaultChar dw 0 ;default character to use ; This is set by fl_SetBltColor CharColor dw 0 ;current character color ; These are set by fl_SetBltDir XPixInc dw 1 ;x inc for each pixel in character bitmap YPixInc dw 0 ;y inc for each pixel in character bitmap XRowInc dw 0 ;x inc for each row in character bitmap YRowInc dw 1 ;y inc for each row in character bitmap XColInc dw 8 ;x inc for each column (8 bits) in char bitmap YColInc dw 0 ;y inc for each column (8 bits) in char bitmap .CODE ;******************************************************************** ; fl_SetBltDir - Sets pixel, row, and column step values for bltchar ; ; BASIC CALL: ; fl.SetBltDir XPixInc%, YPixInc%, XRowInc%, YRowInc% ; ; Comments: ; When bltchar is blt-ing a bitmap to allow the different ; directions to be output it uses preset counter increments ; for moving a pixel, to the next row, and to the next column ; of the bitmap. The pixel and row increments are input to this ; routine. The column increments are calculates as 8 times the ; pixel increment. ; ;******************************************************************** ; Parameters pXPixInc equ WORD PTR [bp+12] pYPixInc equ WORD PTR [bp+10] pXRowInc equ WORD PTR [bp+8] pYRowInc equ WORD PTR [bp+6] PUBLIC FL_SETBLTDIR fl_SetBltDir PROC push bp ;Entry mov bp,sp mov ax,pXRowInc ;Save input parameters mov XRowInc,ax mov ax,pYRowInc mov YRowInc,ax mov ax,pXPixInc mov XPixInc,ax mov cl,3 shl ax,cl mov XColInc,ax ;Column increment = Pix Inc * 8 mov ax,pYPixInc mov YPixInc,ax mov cl,3 shl ax,cl mov YColInc,ax ;Column increment = Pix Inc * 8 pop bp ;Exit ret 8 fl_SetBltDir ENDP ;******************************************************************** ; fl_SetBltColor - Sets the color of blt-ed characters ; ; BASIC CALL: ; fl.SetBltColor color ; ;******************************************************************** ; Parameters pColor EQU WORD PTR [bp+6] PUBLIC FL_SETBLTCOLOR fl_SetBltColor PROC push bp ;Entry mov bp,sp mov ax,pColor ;Save color in data block mov CharColor,ax pop bp ;Exit ret 2 fl_SetBltColor ENDP ;******************************************************************** ; fl_SetBltParams - Sets font-related params for bltchar ; ; BASIC CALL: ; fl.SetBltParams HdrLen%, CharHgt%, FirstChar%, LastChar%, DefChar% ; ;******************************************************************** ; Parameters pHdrLen equ WORD PTR [bp+14] pCharHgt equ WORD PTR [bp+12] pFirstChar equ WORD PTR [bp+10] pLastChar equ WORD PTR [bp+8] pDefChar equ WORD PTR [bp+6] PUBLIC FL_SETBLTPARAMS fl_SetBltParams PROC push bp ;Entry mov bp,sp mov ax,pHdrLen mov HdrLen,ax mov ax,pCharHgt mov CharHeight,ax mov ax,pFirstChar mov FirstChar,ax mov ax,pLastChar mov LastChar,ax mov ax,pDefChar mov DefaultChar,ax pop bp ;Exit ret 10 fl_SetBltParams ENDP ;******************************************************************** ; fl_BltChar - Outputs a character's bitmap to the screen ; ; BASIC CALL: ; fl.BltChar FontAddr(far), Char%, X%, Y% ; ;******************************************************************** ; Parameters pFASeg equ WORD PTR [bp+14] pFAOffset equ WORD PTR [bp+12] pChar equ WORD PTR [bp+10] pX equ WORD PTR [bp+8] pY equ WORD PTR [bp+6] ; Local Variables RowX equ WORD PTR [bp-2] RowY equ WORD PTR [bp-4] CharWid equ WORD PTR [bp-6] ColWid equ WORD PTR [bp-8] PUBLIC FL_BLTCHAR fl_BltChar PROC push bp ;Entry mov bp,sp sub sp,8 ;Make room for local variables push di push si ;Normalize font address (make offset as small as possible) mov ax,pFAOffset mov bx,pFASeg push ax mov cl,4 shr ax,cl ;offset = offset div 16 add bx,ax ;seg = seg + offset pop ax and ax,0Fh ;offset = original offset mod 16 mov si,ax mov es,bx ;Calculate character number mov bx,pChar cmp bx,LastChar ja usedefchar ;Char is > last char, use default sub bx,FirstChar jnc getsize ;Char is > first char, is OK usedefchar: mov bx,DefaultChar ;Get character width from character table in font getsize: shl bx,1 shl bx,1 ;char = char * 4 add bx,si ;offset into char table mov cx,es:[bx] ;cx = character width mov CharWid,cx ;Calculate character bitmap address inc bx ;move to next two bytes in char table inc bx mov cx,es:[bx] add si,cx ;add bitmap offset into font index sub si,HdrLen ;subtract length of header dec si ;decrement for use in output algorithm ;Blt character mov cx,pX ;cx = x coord mov dx,pY ;dx = y coord mov bx,CharWid colloop: mov RowX,cx ;save coordinates of this row mov RowY,dx push bx ;save remaining bits in character cmp bx,8 ;limit to 8 for this column jle colloop2 mov bx,8 colloop2: mov ColWid,bx ;save width of this column for other rows mov ax,CharHeight ;counter for number of rows rowloop: push ax inc si ;increment bitmap pointer mov al,es:[si] ;get byte from bitmap pixloop: shl al,1 ;check next bit (from left to right) jnc nextpixel ;skip this pixel push ax ;save registers push bx push cx push dx push es push si mov ax,CharColor ;set up params for pset call push ax ;color push cx ;x-coordinate push dx ;y-coordinate call B$N1I2 ;set graphics cursor location call B$PSTC ;call PSET pop si ;restore registers pop es pop dx pop cx pop bx pop ax nextpixel: jz nextrow ;skip remaining zero bits add cx,XPixInc ;increment x and y coordinates add dx,YPixInc dec bx ;check for end of byte jnz pixloop ;go for another pixel nextrow: mov cx,RowX ;retrieve the start coord of this row mov dx,RowY add cx,XRowInc ;increment counters for next row add dx,YRowInc mov RowX,cx ;save 'em back again mov RowY,dx mov bx,ColWid ;reset the column width pop ax ;check for the end of this column dec ax jnz rowloop ;repeat for another row nextcol: mov cx,pX ;retrieve the start coord of this column mov dx,pY add cx,XColInc ;increment coordinates for next column add dx,YColInc mov pX,cx ;save coordinates to use after next column mov pY,dx pop bx ;check for end of the bitmap sub bx,8 ja colloop ;repeat for another column ;Done mov ax,CharWid ;return value pop si ;Exit pop di mov sp,bp pop bp ret 10 fl_BltChar ENDP ;******************************************************************** ; fl_MovMem - Moves memory bytes ; ; BASIC CALL: ; fl.MovMem source, dest, nbytes ; ;******************************************************************** PUBLIC FL_MOVMEM fl_MovMem PROC push bp mov bp,sp push si push ds push di les di,[bp+12] lds si,[bp+8] mov cx,[bp+6] rep movsb pop di pop ds pop si pop bp ret 10 fl_MovMem ENDP ;******************************************************************** ; fl_ansi - Converts IBM char to Windows ANSI mapping ; ; BASIC CALL: ; ansi_byte = fl_ansi (ibm_char%) ; ;******************************************************************** .CODE PUBLIC FL_ANSI fl_ansi PROC push bp mov bp,sp xor ax,ax ; zero ax mov al,[bp+6] ; move input byte to ax mov bx,ax ; copy byte to bx and al,7FH ; mask off high bit test bl,80H ; test bx to see it high bit set jz fl_a_2 ; if so then byte < 128, no translation mov bx,OFFSET _OemToAnsiTable xlat fl_a_2: pop bp ret 2 fl_ansi ENDP ;*************************************************************************** ; USA OEM/ANSI translation tables. * ;*************************************************************************** ; ; This translation table is used by U.S.A. and some European countries. ; The original IBM extended character set is now addressed as Code Page 437. ; With DOS 3.3 or later, IBM introduced Code Page 850 as the preeminent ; multilingual character set. ; this translates Oem codes >= 128 to ANSI. ; there are 128 entries. .DATA _OemToAnsiTable label byte db 0C7H ; 80h C cedilla db 0FCh ; 81h u umlaut db 0E9h ; 82h e acute db 0E2h ; 83h a circumflex db 0E4h ; 84h a umlaut db 0E0h ; 85h a grave db 0E5h ; 86h a ring db 0E7h ; 87h c cedilla db 0EAh ; 88h e circumflex db 0EBh ; 89h e umlaut db 0E8h ; 8Ah e grave db 0EFh ; 8Bh i umlaut db 0EEh ; 8Ch i circumflex db 0ECh ; 8Dh i grave db 0C4h ; 8Eh A umlaut db 0C5h ; 8Fh A ring db 0C9h ; 90h E acute db 0E6h ; 91h ae db 0C6h ; 92h AE db 0F4h ; 93h o circumflex db 0F6h ; 94h o umlaut db 0F2h ; 95h o grave db 0FBh ; 96h u circumflex db 0F9h ; 97h u grave db 0FFh ; 98h y umlaut db 0D6h ; 99h O umlaut db 0DCh ; 9Ah U umlaut db 0A2h ; 9Bh cent db 0A3h ; 9Ch british pound db 0A5h ; 9Dh yen db 070h ; 9Eh Pesetas db 066h ; 9Fh florin (dutch) db 0E1h ; A0h a acute db 0EDh ; A1h i acute db 0F3h ; A2h o acute db 0FAh ; A3h u acute db 0F1h ; A4h n tilde db 0D1h ; A5h N tilde db 0AAh ; A6h a underlined superscript db 0BAh ; A7h o underlined superscript db 0BFh ; A8h inverted question mark db 05Fh ; A9h left top corner db 0ACh ; AAh right top corner db 0BDh ; ABh 1/2 db 0BCh ; ACh 1/4 db 0A1h ; ADh inverted point db 0ABh ; AEh << db 0BBh ; AFh >> db 05Fh ; B0h here begins semigraphic characters db 05Fh ; B1h db 05Fh ; B2h db 0A6h ; B3h Vertical bar db 05Fh ; B4h db 05Fh ; B5h db 05Fh ; B6h db 05Fh ; B7h db 05Fh ; B8h db 05Fh ; B9h db 05Fh ; BAh db 05Fh ; BBh db 05Fh ; BCh db 05Fh ; BDh db 05Fh ; BEh db 05Fh ; BFh db 05Fh ; C0h db 05Fh ; C1h db 05Fh ; C2h db 05Fh ; C3h db 05Fh ; C4h db 05Fh ; C5h db 05Fh ; C6h db 05Fh ; C7h db 05Fh ; C8h db 05Fh ; C9h db 05Fh ; CAh db 05Fh ; CBh db 05Fh ; CCh db 05Fh ; CDh db 05Fh ; CEh db 05Fh ; CFh db 05Fh ; D0h db 05Fh ; D1h db 05Fh ; D2h db 05Fh ; D3h db 05Fh ; D4h db 05Fh ; D5h db 05Fh ; D6h db 05Fh ; D7h db 05Fh ; D8h db 05Fh ; D9h db 05Fh ; DAh db 05Fh ; DBh db 05Fh ; DCh db 05Fh ; DDh db 05Fh ; DEh db 05Fh ; DFh end of semigraphic characters db 05Fh ; E0h alpha db 0DFh ; E1h german sharp S or greek beta db 05Fh ; E2h lambda db 0B6h ; E3h pi db 05Fh ; E4h sigma uc db 05Fh ; E5h sigma lc db 0B5h ; E6h mu db 05Fh ; E7h tau db 05Fh ; E8h phi uc db 05Fh ; E9h theta db 05Fh ; EAh omega db 05Fh ; EBh delta db 05Fh ; ECh infinite db 0D8h ; EDh math empty set or phi lc db 05Fh ; EEh math own sign db 05Fh ; EFh math include sign db 05Fh ; F0h math equivalence sign db 0B1h ; F1h + underlined db 05Fh ; F2h greater equal db 05Fh ; F3h less equal db 05Fh ; F4h math integral upper part db 05Fh ; F5h math integral lower part db 05Fh ; F6h math divide db 05Fh ; F7h math approximately (~) db 0B0h ; F8h degree db 0B7h ; F9h period accent (bold) db 0B7h ; FAh period accent db 05Fh ; FBh math root db 06Eh ; FCh n superscript db 0B2h ; FDh 2 superscript db 05Fh ; FEh db 05Fh ; FFh blank END