;

; jdcolext.asm - colorspace conversion (MMX)

;

; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB</ossman@cendio.se>

; Copyright (C) 2016, D. R. Commander.

;

; Based on the x86 SIMD extension for IJG JPEG library

; Copyright (C) 1999-2006, MIYASAKA Masaru.

; For conditions of distribution and use, see copyright notice in jsimdext.inc

;

; This file should be assembled with NASM (Netwide Assembler),

; can *not* be assembled with Microsoft's MASM or any compatible

; assembler (including Borland's Turbo Assembler).

; NASM is available from http://nasm.sourceforge.net/ or

; http://sourceforge.net/project/showfiles.php?group_id=6208

%include "jcolsamp.inc"

; --------------------------------------------------------------------------

;

; Convert some rows of samples to the output colorspace.

;

; GLOBAL(void)

; jsimd_ycc_rgb_convert_mmx(JDIMENSION out_width, JSAMPIMAGE input_buf,

;                           JDIMENSION input_row, JSAMPARRAY output_buf,

;                           int num_rows)

;

%define out_width(b)   (b) + 8          ; JDIMENSION out_width

%define input_buf(b)   (b) + 12         ; JSAMPIMAGE input_buf

%define input_row(b)   (b) + 16         ; JDIMENSION input_row

%define output_buf(b)  (b) + 20         ; JSAMPARRAY output_buf

%define num_rows(b)    (b) + 24         ; int num_rows

%define original_ebp   ebp + 0

%define wk(i)          ebp - (WK_NUM - (i)) * SIZEOF_MMWORD

                                        ; mmword wk[WK_NUM]

%define WK_NUM         2

%define gotptr         wk(0) - SIZEOF_POINTER  ; void * gotptr

    align       32

    GLOBAL_FUNCTION(jsimd_ycc_rgb_convert_mmx)

EXTN(jsimd_ycc_rgb_convert_mmx):

    push        ebp

    mov         eax, esp                    ; eax = original ebp

    sub         esp, byte 4

    and         esp, byte (-SIZEOF_MMWORD)  ; align to 64 bits

    mov         [esp], eax

    mov         ebp, esp                    ; ebp = aligned ebp

    lea         esp, [wk(0)]

    pushpic     eax                     ; make a room for GOT address

    push        ebx

;   push        ecx                     ; need not be preserved

;   push        edx                     ; need not be preserved

    push        esi

    push        edi

    get_GOT     ebx                     ; get GOT address

    movpic      POINTER [gotptr], ebx   ; save GOT address

    mov         ecx, JDIMENSION [out_width(eax)]  ; num_cols

    test        ecx, ecx

    jz          near .return

    push        ecx

    mov         edi, JSAMPIMAGE [input_buf(eax)]

    mov         ecx, JDIMENSION [input_row(eax)]

    mov         esi, JSAMPARRAY [edi+0*SIZEOF_JSAMPARRAY]

    mov         ebx, JSAMPARRAY [edi+1*SIZEOF_JSAMPARRAY]

    mov         edx, JSAMPARRAY [edi+2*SIZEOF_JSAMPARRAY]

    lea         esi, [esi+ecx*SIZEOF_JSAMPROW]

    lea         ebx, [ebx+ecx*SIZEOF_JSAMPROW]

    lea         edx, [edx+ecx*SIZEOF_JSAMPROW]

    pop         ecx

    mov         edi, JSAMPARRAY [output_buf(eax)]

    mov         eax, INT [num_rows(eax)]

    test        eax, eax

    jle         near .return

    alignx      16, 7

.rowloop:

    push        eax

    push        edi

    push        edx

    push        ebx

    push        esi

    push        ecx                     ; col

    mov         esi, JSAMPROW [esi]     ; inptr0

    mov         ebx, JSAMPROW [ebx]     ; inptr1

    mov         edx, JSAMPROW [edx]     ; inptr2

    mov         edi, JSAMPROW [edi]     ; outptr

    movpic      eax, POINTER [gotptr]   ; load GOT address (eax)

    alignx      16, 7

.columnloop:

    movq        mm5, MMWORD [ebx]       ; mm5=Cb(01234567)

    movq        mm1, MMWORD [edx]       ; mm1=Cr(01234567)

    pcmpeqw     mm4, mm4

    pcmpeqw     mm7, mm7

    psrlw       mm4, BYTE_BIT

    psllw       mm7, 7                  ; mm7={0xFF80 0xFF80 0xFF80 0xFF80}

    movq        mm0, mm4                ; mm0=mm4={0xFF 0x00 0xFF 0x00 ..}

    pand        mm4, mm5                ; mm4=Cb(0246)=CbE

    psrlw       mm5, BYTE_BIT           ; mm5=Cb(1357)=CbO

    pand        mm0, mm1                ; mm0=Cr(0246)=CrE

    psrlw       mm1, BYTE_BIT           ; mm1=Cr(1357)=CrO

    paddw       mm4, mm7

    paddw       mm5, mm7

    paddw       mm0, mm7

    paddw       mm1, mm7

    ; (Original)

    ; R = Y                + 1.40200 * Cr

    ; G = Y - 0.34414 * Cb - 0.71414 * Cr

    ; B = Y + 1.77200 * Cb

    ;

    ; (This implementation)

    ; R = Y                + 0.40200 * Cr + Cr

    ; G = Y - 0.34414 * Cb + 0.28586 * Cr - Cr

    ; B = Y - 0.22800 * Cb + Cb + Cb

    movq        mm2, mm4                ; mm2=CbE

    movq        mm3, mm5                ; mm3=CbO

    paddw       mm4, mm4                ; mm4=2*CbE

    paddw       mm5, mm5                ; mm5=2*CbO

    movq        mm6, mm0                ; mm6=CrE

    movq        mm7, mm1                ; mm7=CrO

    paddw       mm0, mm0                ; mm0=2*CrE

    paddw       mm1, mm1                ; mm1=2*CrO

    pmulhw      mm4, [GOTOFF(eax,PW_MF0228)]  ; mm4=(2*CbE * -FIX(0.22800))

    pmulhw      mm5, [GOTOFF(eax,PW_MF0228)]  ; mm5=(2*CbO * -FIX(0.22800))

    pmulhw      mm0, [GOTOFF(eax,PW_F0402)]   ; mm0=(2*CrE * FIX(0.40200))

    pmulhw      mm1, [GOTOFF(eax,PW_F0402)]   ; mm1=(2*CrO * FIX(0.40200))

    paddw       mm4, [GOTOFF(eax,PW_ONE)]

    paddw       mm5, [GOTOFF(eax,PW_ONE)]

    psraw       mm4, 1                  ; mm4=(CbE * -FIX(0.22800))

    psraw       mm5, 1                  ; mm5=(CbO * -FIX(0.22800))

    paddw       mm0, [GOTOFF(eax,PW_ONE)]

    paddw       mm1, [GOTOFF(eax,PW_ONE)]

    psraw       mm0, 1                  ; mm0=(CrE * FIX(0.40200))

    psraw       mm1, 1                  ; mm1=(CrO * FIX(0.40200))

    paddw       mm4, mm2

    paddw       mm5, mm3

    paddw       mm4, mm2                ; mm4=(CbE * FIX(1.77200))=(B-Y)E

    paddw       mm5, mm3                ; mm5=(CbO * FIX(1.77200))=(B-Y)O

    paddw       mm0, mm6                ; mm0=(CrE * FIX(1.40200))=(R-Y)E

    paddw       mm1, mm7                ; mm1=(CrO * FIX(1.40200))=(R-Y)O

    movq        MMWORD [wk(0)], mm4     ; wk(0)=(B-Y)E

    movq        MMWORD [wk(1)], mm5     ; wk(1)=(B-Y)O

    movq        mm4, mm2

    movq        mm5, mm3

    punpcklwd   mm2, mm6

    punpckhwd   mm4, mm6

    pmaddwd     mm2, [GOTOFF(eax,PW_MF0344_F0285)]

    pmaddwd     mm4, [GOTOFF(eax,PW_MF0344_F0285)]

    punpcklwd   mm3, mm7

    punpckhwd   mm5, mm7

    pmaddwd     mm3, [GOTOFF(eax,PW_MF0344_F0285)]

    pmaddwd     mm5, [GOTOFF(eax,PW_MF0344_F0285)]

    paddd       mm2, [GOTOFF(eax,PD_ONEHALF)]

    paddd       mm4, [GOTOFF(eax,PD_ONEHALF)]

    psrad       mm2, SCALEBITS

    psrad       mm4, SCALEBITS

    paddd       mm3, [GOTOFF(eax,PD_ONEHALF)]

    paddd       mm5, [GOTOFF(eax,PD_ONEHALF)]

    psrad       mm3, SCALEBITS

    psrad       mm5, SCALEBITS

    packssdw    mm2, mm4                ; mm2=CbE*-FIX(0.344)+CrE*FIX(0.285)

    packssdw    mm3, mm5                ; mm3=CbO*-FIX(0.344)+CrO*FIX(0.285)

    psubw       mm2, mm6                ; mm2=CbE*-FIX(0.344)+CrE*-FIX(0.714)=(G-Y)E

    psubw       mm3, mm7                ; mm3=CbO*-FIX(0.344)+CrO*-FIX(0.714)=(G-Y)O

    movq        mm5, MMWORD [esi]       ; mm5=Y(01234567)

    pcmpeqw     mm4, mm4

    psrlw       mm4, BYTE_BIT           ; mm4={0xFF 0x00 0xFF 0x00 ..}

    pand        mm4, mm5                ; mm4=Y(0246)=YE

    psrlw       mm5, BYTE_BIT           ; mm5=Y(1357)=YO

    paddw       mm0, mm4                ; mm0=((R-Y)E+YE)=RE=(R0 R2 R4 R6)

    paddw       mm1, mm5                ; mm1=((R-Y)O+YO)=RO=(R1 R3 R5 R7)

    packuswb    mm0, mm0                ; mm0=(R0 R2 R4 R6 ** ** ** **)

    packuswb    mm1, mm1                ; mm1=(R1 R3 R5 R7 ** ** ** **)

    paddw       mm2, mm4                ; mm2=((G-Y)E+YE)=GE=(G0 G2 G4 G6)

    paddw       mm3, mm5                ; mm3=((G-Y)O+YO)=GO=(G1 G3 G5 G7)

    packuswb    mm2, mm2                ; mm2=(G0 G2 G4 G6 ** ** ** **)

    packuswb    mm3, mm3                ; mm3=(G1 G3 G5 G7 ** ** ** **)

    paddw       mm4,  MMWORD [wk(0)]    ; mm4=(YE+(B-Y)E)=BE=(B0 B2 B4 B6)

    paddw       mm5,  MMWORD [wk(1)]    ; mm5=(YO+(B-Y)O)=BO=(B1 B3 B5 B7)

    packuswb    mm4, mm4                ; mm4=(B0 B2 B4 B6 ** ** ** **)

    packuswb    mm5, mm5                ; mm5=(B1 B3 B5 B7 ** ** ** **)

%if RGB_PIXELSIZE == 3  ; ---------------

    ; mmA=(00 02 04 06 ** ** ** **), mmB=(01 03 05 07 ** ** ** **)

    ; mmC=(10 12 14 16 ** ** ** **), mmD=(11 13 15 17 ** ** ** **)

    ; mmE=(20 22 24 26 ** ** ** **), mmF=(21 23 25 27 ** ** ** **)

    ; mmG=(** ** ** ** ** ** ** **), mmH=(** ** ** ** ** ** ** **)

    punpcklbw   mmA, mmC                ; mmA=(00 10 02 12 04 14 06 16)

    punpcklbw   mmE, mmB                ; mmE=(20 01 22 03 24 05 26 07)

    punpcklbw   mmD, mmF                ; mmD=(11 21 13 23 15 25 17 27)

    movq        mmG, mmA

    movq        mmH, mmA

    punpcklwd   mmA, mmE                ; mmA=(00 10 20 01 02 12 22 03)

    punpckhwd   mmG, mmE                ; mmG=(04 14 24 05 06 16 26 07)

    psrlq       mmH, 2*BYTE_BIT         ; mmH=(02 12 04 14 06 16 -- --)

    psrlq       mmE, 2*BYTE_BIT         ; mmE=(22 03 24 05 26 07 -- --)

    movq        mmC, mmD

    movq        mmB, mmD

    punpcklwd   mmD, mmH                ; mmD=(11 21 02 12 13 23 04 14)

    punpckhwd   mmC, mmH                ; mmC=(15 25 06 16 17 27 -- --)

    psrlq       mmB, 2*BYTE_BIT         ; mmB=(13 23 15 25 17 27 -- --)

    movq        mmF, mmE

    punpcklwd   mmE, mmB                ; mmE=(22 03 13 23 24 05 15 25)

    punpckhwd   mmF, mmB                ; mmF=(26 07 17 27 -- -- -- --)

    punpckldq   mmA, mmD                ; mmA=(00 10 20 01 11 21 02 12)

    punpckldq   mmE, mmG                ; mmE=(22 03 13 23 04 14 24 05)

    punpckldq   mmC, mmF                ; mmC=(15 25 06 16 26 07 17 27)

    cmp         ecx, byte SIZEOF_MMWORD

    jb          short .column_st16

    movq        MMWORD [edi+0*SIZEOF_MMWORD], mmA

    movq        MMWORD [edi+1*SIZEOF_MMWORD], mmE

    movq        MMWORD [edi+2*SIZEOF_MMWORD], mmC

    sub         ecx, byte SIZEOF_MMWORD

    jz          short .nextrow

    add         esi, byte SIZEOF_MMWORD                ; inptr0

    add         ebx, byte SIZEOF_MMWORD                ; inptr1

    add         edx, byte SIZEOF_MMWORD                ; inptr2

    add         edi, byte RGB_PIXELSIZE*SIZEOF_MMWORD  ; outptr

    jmp         near .columnloop

    alignx      16, 7

.column_st16:

    lea         ecx, [ecx+ecx*2]        ; imul ecx, RGB_PIXELSIZE

    cmp         ecx, byte 2*SIZEOF_MMWORD

    jb          short .column_st8

    movq        MMWORD [edi+0*SIZEOF_MMWORD], mmA

    movq        MMWORD [edi+1*SIZEOF_MMWORD], mmE

    movq        mmA, mmC

    sub         ecx, byte 2*SIZEOF_MMWORD

    add         edi, byte 2*SIZEOF_MMWORD

    jmp         short .column_st4

.column_st8:

    cmp         ecx, byte SIZEOF_MMWORD

    jb          short .column_st4

    movq        MMWORD [edi+0*SIZEOF_MMWORD], mmA

    movq        mmA, mmE

    sub         ecx, byte SIZEOF_MMWORD

    add         edi, byte SIZEOF_MMWORD

.column_st4:

    movd        eax, mmA

    cmp         ecx, byte SIZEOF_DWORD

    jb          short .column_st2

    mov         dword [edi+0*SIZEOF_DWORD], eax

    psrlq       mmA, DWORD_BIT

    movd        eax, mmA

    sub         ecx, byte SIZEOF_DWORD

    add         edi, byte SIZEOF_DWORD

.column_st2:

    cmp         ecx, byte SIZEOF_WORD

    jb          short .column_st1

    mov         word [edi+0*SIZEOF_WORD], ax

    shr         eax, WORD_BIT

    sub         ecx, byte SIZEOF_WORD

    add         edi, byte SIZEOF_WORD

.column_st1:

    cmp         ecx, byte SIZEOF_BYTE

    jb          short .nextrow

    mov         byte [edi+0*SIZEOF_BYTE], al

%else  ; RGB_PIXELSIZE == 4 ; -----------

%ifdef RGBX_FILLER_0XFF

    pcmpeqb     mm6, mm6                ; mm6=(X0 X2 X4 X6 ** ** ** **)

    pcmpeqb     mm7, mm7                ; mm7=(X1 X3 X5 X7 ** ** ** **)

%else

    pxor        mm6, mm6                ; mm6=(X0 X2 X4 X6 ** ** ** **)

    pxor        mm7, mm7                ; mm7=(X1 X3 X5 X7 ** ** ** **)

%endif

    ; mmA=(00 02 04 06 ** ** ** **), mmB=(01 03 05 07 ** ** ** **)

    ; mmC=(10 12 14 16 ** ** ** **), mmD=(11 13 15 17 ** ** ** **)

    ; mmE=(20 22 24 26 ** ** ** **), mmF=(21 23 25 27 ** ** ** **)

    ; mmG=(30 32 34 36 ** ** ** **), mmH=(31 33 35 37 ** ** ** **)

    punpcklbw   mmA, mmC                ; mmA=(00 10 02 12 04 14 06 16)

    punpcklbw   mmE, mmG                ; mmE=(20 30 22 32 24 34 26 36)

    punpcklbw   mmB, mmD                ; mmB=(01 11 03 13 05 15 07 17)

    punpcklbw   mmF, mmH                ; mmF=(21 31 23 33 25 35 27 37)

    movq        mmC, mmA

    punpcklwd   mmA, mmE                ; mmA=(00 10 20 30 02 12 22 32)

    punpckhwd   mmC, mmE                ; mmC=(04 14 24 34 06 16 26 36)

    movq        mmG, mmB

    punpcklwd   mmB, mmF                ; mmB=(01 11 21 31 03 13 23 33)

    punpckhwd   mmG, mmF                ; mmG=(05 15 25 35 07 17 27 37)

    movq        mmD, mmA

    punpckldq   mmA, mmB                ; mmA=(00 10 20 30 01 11 21 31)

    punpckhdq   mmD, mmB                ; mmD=(02 12 22 32 03 13 23 33)

    movq        mmH, mmC

    punpckldq   mmC, mmG                ; mmC=(04 14 24 34 05 15 25 35)

    punpckhdq   mmH, mmG                ; mmH=(06 16 26 36 07 17 27 37)

    cmp         ecx, byte SIZEOF_MMWORD

    jb          short .column_st16

    movq        MMWORD [edi+0*SIZEOF_MMWORD], mmA

    movq        MMWORD [edi+1*SIZEOF_MMWORD], mmD

    movq        MMWORD [edi+2*SIZEOF_MMWORD], mmC

    movq        MMWORD [edi+3*SIZEOF_MMWORD], mmH

    sub         ecx, byte SIZEOF_MMWORD

    jz          short .nextrow

    add         esi, byte SIZEOF_MMWORD                ; inptr0

    add         ebx, byte SIZEOF_MMWORD                ; inptr1

    add         edx, byte SIZEOF_MMWORD                ; inptr2

    add         edi, byte RGB_PIXELSIZE*SIZEOF_MMWORD  ; outptr

    jmp         near .columnloop

    alignx      16, 7

.column_st16:

    cmp         ecx, byte SIZEOF_MMWORD/2

    jb          short .column_st8

    movq        MMWORD [edi+0*SIZEOF_MMWORD], mmA

    movq        MMWORD [edi+1*SIZEOF_MMWORD], mmD

    movq        mmA, mmC

    movq        mmD, mmH

    sub         ecx, byte SIZEOF_MMWORD/2

    add         edi, byte 2*SIZEOF_MMWORD

.column_st8:

    cmp         ecx, byte SIZEOF_MMWORD/4

    jb          short .column_st4

    movq        MMWORD [edi+0*SIZEOF_MMWORD], mmA

    movq        mmA, mmD

    sub         ecx, byte SIZEOF_MMWORD/4

    add         edi, byte 1*SIZEOF_MMWORD

.column_st4:

    cmp         ecx, byte SIZEOF_MMWORD/8

    jb          short .nextrow

    movd        dword [edi+0*SIZEOF_DWORD], mmA

%endif  ; RGB_PIXELSIZE ; ---------------

    alignx      16, 7

.nextrow:

    pop         ecx

    pop         esi

    pop         ebx

    pop         edx

    pop         edi

    pop         eax

    add         esi, byte SIZEOF_JSAMPROW

    add         ebx, byte SIZEOF_JSAMPROW

    add         edx, byte SIZEOF_JSAMPROW

    add         edi, byte SIZEOF_JSAMPROW  ; output_buf

    dec         eax                        ; num_rows

    jg          near .rowloop

    emms                                ; empty MMX state

.return:

    pop         edi

    pop         esi

;   pop         edx                     ; need not be preserved

;   pop         ecx                     ; need not be preserved

    pop         ebx

    mov         esp, ebp                ; esp <- aligned ebp

    pop         esp                     ; esp <- original ebp

    pop         ebp

    ret

; For some reason, the OS X linker does not honor the request to align the

; segment unless we do this.

    align       32