HPAVC/HPAVC CD-ROM.iso/pc/HELLSRC.ZIP/PSBM.RT

Text File | 1993-10-16 | 6.7 KB | 245 lines

public  _psbm
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; Put a damn scaled bitmap to modeX screen (with clipping ofcourse). This one
; still doesn't use RLE... Just a plain old scaled bitblt with 0 checking in
; 4 MOD(4) bitmap puts.
; In:
;   EAX low word - X loc in 320*200 screen to put at
;   EAX high word - Y loc in 320*200 screen to put at
;   EBX low word - actual X size of bitmap
;   EBX high word - actual Y size of bitmap
;   ECX low word - X size to put
;   ECX high word - Y size to put
;   DS:SI -> bitmap
;   ES:DI -> physical screen buffer (full 320*200 modeX)
; Notes:
;   Don't call this routine with any X or Y sizes of 0.
;   The index on the VGA sequencer reg is assumed to be 2.
;   This routine is still not the most optimal for the job.
;   Will work in real mode, just change '$+6' to '$+5' on line 47.
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VS=34
ysfract         equ word ptr [esp+2]
ysfractcount    equ word ptr [esp+4]
ysdivisor       equ word ptr [esp+VS+26]
ysoneline       equ word ptr [esp+VS+16]
ylineadd        equ word ptr [esp+16]
ylinecount      equ word ptr [esp+6]
srcptr          equ word ptr [esp+8]
dstptr          equ word ptr [esp+10]
ysfractcount2   equ word ptr [esp+18]
ylinecount2     equ word ptr [esp]
srcptr2         equ word ptr [esp+12]
dstptr2         equ word ptr [esp+14]
xsfract         equ word ptr [esp+20]
xsfractcount    equ word ptr [esp+30]
xsfractcounthi  equ dword ptr [esp+28]
xsdivisor       equ word ptr [esp+VS+24]
xpixeladd       equ word ptr [esp+24]
xpixelcount     equ word ptr [esp+22]
xstatword       equ word ptr [esp+26]
xpixelstat      equ byte ptr [esp+32]
;─────────────────────────────────────────────────────────────────────────────
rept 320
temp=$
        mov al,[si]
        or al,al
        jz short $+6
        mov es:[di],al
        add edi,ecx
        adc si,bp
PSBMPUTCODELEN=$-temp
endm
psbmputcode:
        jmp psbml0c
;─────────────────────────────────────────────────────────────────────────────
_psbm:
        pushad
        sub esp,VS

        cmp ax,140h                     ; out of bounds? (below or right)
        jge psbmd
        cmp eax,0c80000h
        jge psbmd
        mov edx,eax                     ; out of bounds¿ (above or left)
        add dx,cx
        cmp dx,0
        jle psbmd
        xor dx,dx
        add edx,ecx
        cmp edx,0ffffh
        jle psbmd

;-----------------------------------------------------------------------------
        shld eax,ebx,16                 ; figure Y scale stuff (the easy part)
        rol ecx,16
        cwd
        div cx
        mov ysfract,dx
        mul bx
        mov ylineadd,ax

        mov bp,[esp+VS+30]              ; figure Y clip stuff (also easy)
        add cx,bp
        xor bx,bx
        cmp bp,0
        jge short psbmf0
        sub bx,bp
        xor bp,bp
psbmf0:
        mov ax,80
        mul bp
        add di,ax
        cmp cx,200
        jb short psbmf1
        mov cx,200
psbmf1:
        sub bp,cx
        neg bp
        mov ylinecount,bp
        mov ax,ysfract
        mov bp,ysdivisor
        mul bx
        div bp
        sub dx,bp
        neg dx
        mov ysfractcount,dx
        mov ax,bx
        mul word ptr [esp+VS+18]
        div bp
        mul ysoneline
        add si,ax

;-----------------------------------------------------------------------------
        mov ax,[esp+VS+16]
        shr ecx,16                      ; figure X scale crap (still easy)
        cwd
        div cx
        mov xsfract,dx
        mov xpixeladd,ax

        movzx ebp,word ptr [esp+VS+28]  ; figure X clip crap (more easy)
        lea edx,[ecx+ebp]
        xor bx,bx
        cmp bp,0
        jge short psbmf2
        sub bx,bp
        xor bp,bp
psbmf2:
        mov cx,bp
        and cl,3
        mov ax,401h
        shl al,cl
        mov xstatword,ax
        mov ax,bp
        shr ax,2
        add di,ax
        cmp dx,320
        jb short psbmf3
        mov dx,320
psbmf3:
        sub bp,dx
        neg bp
        add bp,3
        mov ax,bp
        and al,3
        mov xpixelstat,al
        shr bp,2
        neg bp
        imul bp,PSBMPUTCODELEN
        add bp,offset psbmputcode
        mov xpixelcount,bp
        mov ax,xsfract
        mov bp,xsdivisor
        mul bx
        div bp
        mov xsfractcount,dx
        mov ax,bx
        mul word ptr [esp+VS+16]
        div bp
        add si,ax

;-----------------------------------------------------------------------------
    mov cx,xsdivisor        ; figure other misc stuff
        mov dx,xsfractcount
        xor ax,ax
        div cx
        shl eax,16
        mov xsfractcounthi,eax
    mov dx,xsfract
        mov eax,10000h
        div cx
        mov xsfract,ax
    mov bx,ax
        shl bx,2
        movzx ebp,xpixeladd
        shl bp,2
        shr ax,14
        add ebp,eax
        shrd ecx,ebx,16
        mov cx,1
        mov ax,xstatword
;─────────────────────────────────────────────────────────────────────────────
psbml1:                                 ; main outer loop
        mov srcptr,si
        mov dstptr,di
        mov xstatword,ax
        mov dx,3c5h
        out dx,al
        mov ax,ysfractcount
        mov ysfractcount2,ax
        mov ax,ylinecount
        mov ylinecount2,ax
;-----------------------------------------------------------------------------
psbml0:
        mov srcptr2,si
        mov dstptr2,di
        movzx edi,di
        or edi,xsfractcounthi
        jmp xpixelcount
;-----------------------------------------------------------------------------
psbml0c:
        mov si,srcptr2
        mov ax,ysfractcount2
        sub ax,ysfract
        ja short psbml0c2
        add ax,ysdivisor
        add si,ysoneline
psbml0c2:
        mov ysfractcount2,ax
        add si,ylineadd
        mov di,dstptr2
        add di,80
        dec ylinecount2
        jnz psbml0
;-----------------------------------------------------------------------------
psbml1c:
        sub xpixelstat,1
        jnc short psbml1c2
        mov ax,xpixelcount
        add ax,PSBMPUTCODELEN
        cmp ax,offset psbmputcode
        je short psbmd
        mov xpixelcount,ax
psbml1c2:
        mov si,srcptr
        mov ax,xsfractcount
        add ax,xsfract
        adc si,0
        mov xsfractcount,ax
        add si,xpixeladd
        mov di,dstptr
        mov ax,xstatword
        bt ax,3
        rcl al,1
        btr ax,4
        adc di,0
        dec ah
        jnz psbml1
;─────────────────────────────────────────────────────────────────────────────
psbmd:
        add esp,VS
        popad
        ret