struct  BLITTER_BLOCK
        xmin            dd ?
        ymin            dd ?
        xmax            dd ?
        ymax            dd ?
ends


struct  BLITTER
        dc              BLITTER_BLOCK
        sc              BLITTER_BLOCK
        dst_x           dd ?            ;  32
        dst_y           dd ?            ;  36
        src_x           dd ?            ;  40
        src_y           dd ?            ;  44
        w               dd ?            ;  48
        h               dd ?            ;  52

        bitmap          dd ?            ;  56
        stride          dd ?            ;  60
ends


align 4

__L1OutCode:
        push    ebx
        mov     ebx, 8
        cmp     edx, [eax]
        jl      .L2
        xor     ebx, ebx
        cmp     edx, [eax+8]
        setg    bl
        sal     ebx, 2
.L2:
        cmp     ecx, [eax+4]
        jge     .L3
        or      ebx, 1
        jmp     .L4

.L3:
        cmp     ecx, [eax+12]
        jle     .L4
        or      ebx, 2
.L4:
        mov     eax, ebx
        pop     ebx
        ret

align 4
block_clip:
        push    ebp
        push    edi
        push    esi
        push    ebx
        sub     esp, 4

        mov     ebx, eax
        mov     [esp], edx
        mov     ebp, ecx
        mov     ecx, [ecx]
        mov     edx, [edx]
        call    __L1OutCode

        mov     esi, eax
        mov     edx, [esp+28]
        mov     ecx, [edx]
.L21:
        mov     eax, [esp+24]
        mov     edx, [eax]
        mov     eax, ebx
        call    __L1OutCode

        mov     edi, eax
.L20:
        mov     eax, edi
        and     eax, esi
        jne     .L9
        cmp     esi, edi
        je      .L9
        test    esi, esi
        jne     .L10
        test    edi, 1
        je      .L11
        mov     eax, [ebx+4]
        jmp     .L25
.L11:
        test    edi, 2
        je      .L13
        mov     eax, [ebx+12]
.L25:
        mov     edx, [esp+28]
        jmp     .L22
.L13:
        test    edi, 4
        je      .L14
        mov     eax, [ebx+8]
        jmp     .L26
.L14:
        and     edi, 8
        je      .L12
        mov     eax, [ebx]
.L26:
        mov     edx, [esp+24]
.L22:
        mov     [edx], eax
.L12:
        mov     eax, [esp+28]
        mov     ecx, [eax]
        jmp     .L21
.L10:
        test    esi, 1
        je      .L16
        mov     eax, [ebx+4]
        jmp     .L23
.L16:
        test    esi, 2
        je      .L18
        mov     eax, [ebx+12]
.L23:
        mov     [ebp+0], eax
        jmp     .L17
.L18:
        test    esi, 4
        je      .L19
        mov     eax, [ebx+8]
        jmp     .L24
.L19:
        and     esi, 8
        je      .L17
        mov     eax, [ebx]
.L24:
        mov     edx, [esp]
        mov     [edx], eax
.L17:
        mov     ecx, [ebp+0]
        mov     eax, [esp]
        mov     edx, [eax]
        mov     eax, ebx
        call    __L1OutCode
        mov     esi, eax
        jmp     .L20
.L9:
        add     esp, 4
        pop     ebx
        pop     esi
        pop     edi
        pop     ebp
        ret

align 4
blit_clip:

.sx0   equ 36
.sy0   equ 32
.sx1   equ 28
.sy1   equ 24

.dx0   equ 20
.dy0   equ 16
.dx1   equ 12
.dy1   equ 8


        push    edi
        push    esi
        push    ebx
        sub     esp, 40

        mov     ebx, ecx
        mov     edx, [ecx+BLITTER.src_x]
        mov     [esp+.sx0], edx
        mov     eax, [ecx+BLITTER.src_y]
        mov     [esp+.sy0], eax
        add     edx, [ecx+BLITTER.w]
        dec     edx
        mov     [esp+.sx1], edx
        add     eax, [ecx+BLITTER.h]
        dec     eax
        mov     [esp+.sy1], eax

        lea     ecx, [esp+.sy0]
        lea     edx, [esp+.sx0]
        lea     eax, [ebx+BLITTER.sc]
        lea     esi, [esp+.sy1]

        mov     [esp+4], esi
        lea     esi, [esp+.sx1]
        mov     [esp], esi
        call    block_clip

        mov     esi, 1
        test    eax, eax
        jne     .L28

        mov     edi, [esp+.sx0]
        mov     edx, [ebx+BLITTER.dst_x]
        add     edx, edi
        sub     edx, [ebx+BLITTER.src_x]
        mov     [esp+.dx0], edx

        mov     ecx, [esp+.sy0]
        mov     eax, [ebx+BLITTER.dst_y]
        add     eax, ecx
        sub     eax, [ebx+BLITTER.src_y]
        mov     [esp+.dy0], eax
        sub     edx, edi
        add     edx, [esp+.sx1]
        mov     [esp+.dx1], edx

        sub     eax, ecx
        add     eax, [esp+.sy1]
        mov     [esp+.dy1], eax

        lea     ecx, [esp+.dy0]
        lea     edx, [esp+.dx0]
        lea     eax, [esp+.dy1]
        mov     [esp+4], eax
        lea     eax, [esp+.dx1]
        mov     [esp], eax
        mov     eax, ebx
        call    block_clip
        test    eax, eax
        jne     .L28

        mov     edx, [esp+.dx0]
        mov     eax, [esp+.dx1]
        inc     eax
        sub     eax, edx
        mov     [ebx+BLITTER.w], eax

        mov     eax, [esp+.dy0]
        mov     ecx, [esp+.dy1]
        inc     ecx
        sub     ecx, eax
        mov     [ebx+BLITTER.h], ecx

        mov     ecx, [ebx+BLITTER.src_x]
        add     ecx, edx
        sub     ecx, [ebx+BLITTER.dst_x]
        mov     [ebx+BLITTER.src_x], ecx

        mov     ecx, [ebx+BLITTER.src_y]
        add     ecx, eax
        sub     ecx, [ebx+BLITTER.dst_y]
        mov     [ebx+BLITTER.src_y], ecx
        mov     [ebx+BLITTER.dst_x], edx
        mov     [ebx+BLITTER.dst_y], eax
        xor     esi, esi
.L28:
        mov     eax, esi
        add     esp, 40
        pop     ebx
        pop     esi
        pop     edi


purge .sx0
purge .sy0
purge .sx1
purge .sy1

purge .dx0
purge .dy0
purge .dx1
purge .dy1

        ret



align 4

blit_32:
        push    ebp
        push    edi
        push    esi
        push    ebx
        sub     esp, 72

        mov     eax, [TASK_BASE]
        mov     ebx, [eax-twdw + WDATA.box.width]
        mov     edx, [eax-twdw + WDATA.box.height]

        xor     eax, eax

        mov     [esp+BLITTER.dc.xmin], eax
        mov     [esp+BLITTER.dc.ymin], eax
        mov     [esp+BLITTER.dc.xmax], ebx
        mov     [esp+BLITTER.dc.ymax], edx

        mov     [esp+BLITTER.sc.xmin], eax
        mov     [esp+BLITTER.sc.ymin], eax
        mov     eax, [ecx+24]
        dec     eax
        mov     [esp+BLITTER.sc.xmax], eax
        mov     eax, [ecx+28]
        dec     eax
        mov     [esp+BLITTER.sc.ymax], eax

        mov     eax, [ecx]
        mov     [esp+BLITTER.dst_x], eax
        mov     eax, [ecx+4]
        mov     [esp+BLITTER.dst_y], eax

        mov     eax, [ecx+16]
        mov     [esp+BLITTER.src_x], eax
        mov     eax, [ecx+20]
        mov     [esp+BLITTER.src_y], eax
        mov     eax, [ecx+8]
        mov     [esp+BLITTER.w], eax
        mov     eax, [ecx+12]
        mov     [esp+BLITTER.h], eax


        mov     eax, [ecx+32]
        mov     [esp+56], eax
        mov     eax, [ecx+36]
        mov     [esp+60], eax

        mov     ecx, esp
        call    blit_clip
        test    eax, eax
        jne     .L57

        mov     eax, [TASK_BASE]

        mov     ebx, [esp+BLITTER.dst_x]
        mov     ebp, [esp+BLITTER.dst_y]
        add     ebx, [eax-twdw + WDATA.box.left]
        add     ebp, [eax-twdw + WDATA.box.top]

        mov     ecx, ebx
        add     ecx, [esp+BLITTER.w]
        shl     ecx, 16
        mov     cx, bp
        add     ecx, [esp+BLITTER.h]

        mov     edi, ebp

        imul    edi, [_display.pitch]
;        imul    ebp, [_display.width]
        mov     ebp, [d_width_calc_area + ebp*4]

        add     ebp, ebx
        add     ebp, [_WinMapAddress]

        mov     eax, [esp+BLITTER.src_y]
        imul    eax, [esp+BLITTER.stride]
        mov     esi, [esp+BLITTER.src_x]
        lea     esi, [eax+esi*4]
        add     esi, [esp+BLITTER.bitmap]

        mov     eax, ecx
        mov     ecx, [esp+BLITTER.h]
        mov     edx, [esp+BLITTER.w]

        test    ecx, ecx    ;FIXME check clipping
        jz      .L57

        test    edx, edx
        jz      .L57

        cmp     [_display.bpp], 32
        jne     .core_24

        lea     edi, [edi+ebx*4]

        mov     ebx, [CURRENT_TASK]
align 4
.outer32:
        xor     ecx, ecx

align 4
.inner32:
        cmp     [ebp+ecx], bl
        jne     .skip
;--------------------------------------
        push    eax
        mov     eax, [esi+ecx*4]

; check for hardware cursor
        cmp     [_display.select_cursor], select_cursor
        je      @f
        cmp     [_display.select_cursor], 0
        jne     .no_mouseunder
;--------------------------------------
align 4
@@:
        push    ecx

        mov     ecx, [esp+4]
        ror     ecx, 16
        sub     ecx, edx
        rol     ecx, 16
        sub     ecx, [esp+BLITTER.h + 8]

; check mouse area for putpixel
        call    [_display.check_mouse]
        pop     ecx
;--------------------------------------
align 4
.no_mouseunder:
; store to real LFB
        mov     [LFB_BASE+edi+ecx*4], eax
        pop     eax
;--------------------------------------
align 4
.skip:
        inc     ecx
        dec     edx
        jnz     .inner32

        add     esi, [esp+BLITTER.stride]
        add     edi, [_display.pitch]
        add     ebp, [_display.width]

        mov     edx, [esp+BLITTER.w]
        dec     [esp+BLITTER.h]
        jnz     .outer32

.done:
        call    [draw_pointer]
.L57:
        add     esp, 72
        pop     ebx
        pop     esi
        pop     edi
        pop     ebp
        ret

.core_24:
        lea     ebx, [ebx+ebx*2]
        lea     edi, [LFB_BASE+edi+ebx]
        mov     ebx, [CURRENT_TASK]

align 4
.outer24:
        mov     [esp+64], edi
        xor     ecx, ecx

align 4
.inner24:
        cmp     [ebp+ecx], bl
        jne     .skip_1
;--------------------------------------
        push    eax
        mov     eax, [esi+ecx*4]

        lea     edi, [edi+ecx*2]

; check for hardware cursor
        cmp     [_display.select_cursor], select_cursor
        je      @f
        cmp     [_display.select_cursor], 0
        jne     .no_mouseunder_1
;--------------------------------------
align 4
@@:
        push    ecx

        mov     ecx, [esp+4]
        ror     ecx, 16
        sub     ecx, edx
        rol     ecx, 16
        sub     ecx, [esp+BLITTER.h + 8]

; check mouse area for putpixel
        call    [_display.check_mouse]
        pop     ecx
;--------------------------------------
align 4
.no_mouseunder_1:
        mov     [edi+ecx], ax
        shr     eax, 16
        mov     [edi+ecx+2], al

        pop     eax
;--------------------------------------
align 4
.skip_1:
        mov     edi, [esp+64]
        inc     ecx
        dec     edx
        jnz     .inner24

        add     esi, [esp+BLITTER.stride]
        add     edi, [_display.pitch]
        add     ebp, [_display.width]

        mov     edx, [esp+BLITTER.w]
        dec     [esp+BLITTER.h]
        jnz     .outer24

        jmp     .done