source: trunk/src/gdi32/rgbcvt.asm@ 2607

; $Id: rgbcvt.asm,v 1.1 2000-02-03 10:23:25 dengert Exp $
; Copyright 2000 Daniela Engert (dani@ngrt.de)

        .386p
        .MODEL FLAT
        .CODE

; void _Optlink RGB555to565 (WORD *dest, WORD *src, ULONG num);

        PUBLIC ?RGB555to565

?RGB555to565 PROC NEAR

        PUSH    ESI
        PUSH    EDI
        CLD

        MOV     EDI, EAX                ; _Optlink arg1 = EAX
        MOV     ESI, EDX                ; _Optlink arg2 = EDX
        SHR     ECX, 1                  ; _Optlink arg3 = ECX
        PUSHF
cvt:
        LODSD
        MOV     EDX, EAX
        AND     EDX, 001F001Fh
        SHL     EAX, 1
        AND     EAX, 0FFC0FFC0h
        OR      EAX, EDX
        STOSD
        LOOP    cvt

        POPF
        JNC     SHORT done

        LODSW
        MOV     DX, AX
        AND     DX, 001Fh
        SHL     AX, 1
        AND     AX, 0FFC0h
        OR      AX, DX
        STOSW

done:
        POP     EDI
        POP     ESI
        RET

        ENDP

        END