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;;                                                              ;;
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;;                                                              ;;
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;;  See file COPYING for details                                ;;
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;;  See file COPYING for details                                ;;
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;;                                                              ;;
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;;                                                              ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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$Revision: 753 $
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$Revision: 755 $
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vesa20_drawbackground_stretch:
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vesa20_drawbackground_stretch:
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        call    [disable_mouse]
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        call    [disable_mouse]
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        pushad
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        pushad
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; Helper variables
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; Helper variables
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; calculate 2^32*(BgrDataWidth-1) mod (Screen_Max_X-1)
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; calculate 2^32*(BgrDataWidth-1) mod (ScreenWidth-1)
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        mov     eax, [BgrDataWidth]
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        mov     eax, [BgrDataWidth]
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        dec     eax
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        dec     eax
870 
        xor     edx, edx
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        xor     edx, edx
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        div     dword [Screen_Max_X]
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        div     dword [Screen_Max_X]
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        push    eax
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        push    eax
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; 2) Calculate offset in background memory block
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; 2) Calculate offset in background memory block
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        mov     eax, ebx
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        mov     eax, ebx
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        imul    ebx, dword [esp+12]
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        imul    ebx, dword [esp+12]
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        mul     dword [esp+8]
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        mul     dword [esp+8]
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        add     edx, ebx        ; edx:eax = y * 2^32*(BgrDataHeight-1)/(Screen_Max_Y-1)
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        add     edx, ebx        ; edx:eax = y * 2^32*(BgrDataHeight-1)/(ScreenHeight-1)
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        mov     esi, edx
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        mov     esi, edx
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        imul    esi, [BgrDataWidth]
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        imul    esi, [BgrDataWidth]
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        push    edx
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        push    edx
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        push    eax
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        push    eax
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        mov     eax, [esp+8]
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        mov     eax, [esp+8]
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        mul     dword [esp+28]
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        mul     dword [esp+28]
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        push    eax
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        push    eax
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        mov     eax, [esp+12]
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        mov     eax, [esp+12]
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        mul     dword [esp+28]
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        mul     dword [esp+28]
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        add     [esp], edx
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        add     [esp], edx
922 
        pop     edx             ; edx:eax = x * 2^32*(BgrDataWidth-1)/(Screen_Max_X-1)
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        pop     edx             ; edx:eax = x * 2^32*(BgrDataWidth-1)/(ScreenWidth-1)
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        add     esi, edx
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        add     esi, edx
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        lea     esi, [esi*3]
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        lea     esi, [esi*3]
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        add     esi, [img_background]
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        add     esi, [img_background]
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        push    eax
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        push    eax
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        push    edx
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        push    edx
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; 4) Loop through redraw rectangle and copy background data
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; 4) Loop through redraw rectangle and copy background data
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; Registers meaning:
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; Registers meaning:
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; esi = offset in current line, edi -> output
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; esi = offset in current line, edi -> output
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; ebp = offset in WinMapAddress
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; ebp = offset in WinMapAddress
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; dword [esp] = offset in bgr data
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; dword [esp] = offset in bgr data
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; qword [esp+4] = x * 2^32 * (BgrDataWidth-1) / (Screen_Max_X-1)
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; qword [esp+4] = x * 2^32 * (BgrDataWidth-1) / (ScreenWidth-1)
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; qword [esp+12] = y * 2^32 * (BgrDataHeight-1) / (Screen_Max_Y-1)
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; qword [esp+12] = y * 2^32 * (BgrDataHeight-1) / (ScreenHeight-1)
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; dword [esp+20] = x
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; dword [esp+20] = x
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; dword [esp+24] = y
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; dword [esp+24] = y
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; precalculated constants:
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; precalculated constants:
965 
; qword [esp+28] = 2^32*(BgrDataHeight-1)/(Screen_Max_Y-1)
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; qword [esp+28] = 2^32*(BgrDataHeight-1)/(ScreenHeight-1)
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; qword [esp+36] = 2^32*(BgrDataWidth-1)/(Screen_Max_X-1)
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; qword [esp+36] = 2^32*(BgrDataWidth-1)/(ScreenWidth-1)
967 
sdp3a:
 967 
sdp3a:
968 
        cmp     [ebp+WinMapAddress], byte 1
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        cmp     [ebp+WinMapAddress], byte 1
969 
        jnz     snbgp
 969 
        jnz     snbgp
970 
        mov     eax, [bgr_cur_line+esi]
 970 
        mov     eax, [bgr_cur_line+esi]
971 
        test    ecx, ecx
 971 
        test    ecx, ecx