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Java example source code file (mlib_v_ImageChannelExtract_1.c)

This example Java source code file (mlib_v_ImageChannelExtract_1.c) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

channelextract_s16_21l, channelextract_s16_21r, channelextract_s16_31l, channelextract_s16_31m, channelextract_s16_31r, channelextract_s16_41l, channelextract_s16_41ml, channelextract_u8_21l, channelextract_u8_21r, channelextract_u8_31l, channelextract_u8_31r, channelextract_u8_41ml, channelextract_u8_41mr, channelextract_u8_41r

The mlib_v_ImageChannelExtract_1.c Java example source code

/*
 * Copyright (c) 1998, 2003, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */



/*
 * FILENAME: mlib_ImageChannelExtract_1.c
 *
 * FUNCTIONS
 *      mlib_v_ImageChannelExtract_U8_21_A8D1X8
 *      mlib_v_ImageChannelExtract_U8_21_A8D2X8
 *      mlib_v_ImageChannelExtract_U8_21_D1
 *      mlib_v_ImageChannelExtract_U8_21
 *      mlib_v_ImageChannelExtract_U8_31_A8D1X8
 *      mlib_v_ImageChannelExtract_U8_31_A8D2X8
 *      mlib_v_ImageChannelExtract_U8_31_D1
 *      mlib_v_ImageChannelExtract_U8_31
 *      mlib_v_ImageChannelExtract_U8_41_A8D1X8
 *      mlib_v_ImageChannelExtract_U8_41_A8D2X8
 *      mlib_v_ImageChannelExtract_U8_41_D1
 *      mlib_v_ImageChannelExtract_U8_41
 *      mlib_v_ImageChannelExtract_S16_21_A8D1X4
 *      mlib_v_ImageChannelExtract_S16_21_A8D2X4
 *      mlib_v_ImageChannelExtract_S16_21_D1
 *      mlib_v_ImageChannelExtract_S16_21
 *      mlib_v_ImageChannelExtract_S16_31_A8D1X4
 *      mlib_v_ImageChannelExtract_S16_31_A8D2X4
 *      mlib_v_ImageChannelExtract_S16_31_D1
 *      mlib_v_ImageChannelExtract_S16_31
 *      mlib_v_ImageChannelExtract_S16_41_A8D1X4
 *      mlib_v_ImageChannelExtract_S16_41_A8D2X4
 *      mlib_v_ImageChannelExtract_S16_41_D1
 *      mlib_v_ImageChannelExtract_S16_41
 *
 * ARGUMENT
 *      src    pointer to source image data
 *      dst    pointer to destination image data
 *      slb    source image line stride in bytes
 *      dlb   destination image line stride in bytes
 *      dsize  image data size in pixels
 *      xsize  image width in pixels
 *      ysize  image height in lines
 *      cmask channel mask
 *
 * DESCRIPTION
 *      Extract the one selected channel of the source image into the
 *      1-channel destination image.
 *
 * NOTE
 *      These functions are separated from mlib_ImageChannelExtract.c
 *      for loop unrolling and structure clarity.
 */

#include "vis_proto.h"
#include "mlib_image.h"
#include "mlib_v_ImageChannelExtract.h"

/***************************************************************/
#define CHANNELEXTRACT_U8_21L(sd0, sd1, dd)                     \
  sda = vis_fpmerge(vis_read_hi(sd0), vis_read_hi(sd1));        \
  sdb = vis_fpmerge(vis_read_lo(sd0), vis_read_lo(sd1));        \
  sdc = vis_fpmerge(vis_read_hi(sda), vis_read_hi(sdb));        \
  sdd = vis_fpmerge(vis_read_lo(sda), vis_read_lo(sdb));        \
  dd  = vis_fpmerge(vis_read_hi(sdc), vis_read_hi(sdd))

/***************************************************************/
#define CHANNELEXTRACT_U8_21R(sd0, sd1, dd)                     \
  sda = vis_fpmerge(vis_read_hi(sd0), vis_read_hi(sd1));        \
  sdb = vis_fpmerge(vis_read_lo(sd0), vis_read_lo(sd1));        \
  sdc = vis_fpmerge(vis_read_hi(sda), vis_read_hi(sdb));        \
  sdd = vis_fpmerge(vis_read_lo(sda), vis_read_lo(sdb));        \
  dd  = vis_fpmerge(vis_read_lo(sdc), vis_read_lo(sdd))

/***************************************************************/
/* extract one channel from a 2-channel image.
 * both source and destination image data are 8-byte aligned.
 * xsize is multiple of 8.
 */

void mlib_v_ImageChannelExtract_U8_21_A8D1X8(const mlib_u8 *src,
                                             mlib_u8       *dst,
                                             mlib_s32      dsize,
                                             mlib_s32      cmask)
{
  mlib_d64 *sp, *dp;
  mlib_d64 sd0, sd1;
  mlib_d64 sda, sdb, sdc, sdd;
  mlib_d64 dd;
  mlib_s32 i;

  sp = (mlib_d64 *) src;
  dp = (mlib_d64 *) dst;

  if (cmask == 2) {
#pragma pipeloop(0)
    for (i = 0; i < dsize / 8; i++) {
      sd0 = *sp++;
      sd1 = *sp++;
      CHANNELEXTRACT_U8_21L(sd0, sd1, dd);
      *dp++ = dd;
    }
  }
  else {
#pragma pipeloop(0)
    for (i = 0; i < dsize / 8; i++) {
      sd0 = *sp++;
      sd1 = *sp++;
      CHANNELEXTRACT_U8_21R(sd0, sd1, dd);
      *dp++ = dd;
    }
  }
}

/***************************************************************/
/* extract one channel from a 2-channel image.
 * both source and destination image data are 8-byte aligned.
 * xsize is multiple of 8.
 */

void mlib_v_ImageChannelExtract_U8_21_A8D2X8(const mlib_u8 *src,
                                             mlib_s32      slb,
                                             mlib_u8       *dst,
                                             mlib_s32      dlb,
                                             mlib_s32      xsize,
                                             mlib_s32      ysize,
                                             mlib_s32      cmask)
{
  mlib_d64 *sp, *dp;
  mlib_d64 *sl, *dl;
  mlib_d64 sd0, sd1;
  mlib_d64 sda, sdb, sdc, sdd;
  mlib_d64 dd;
  mlib_s32 i, j;

  sp = sl = (mlib_d64 *) src;
  dp = dl = (mlib_d64 *) dst;

  if (cmask == 2) {
    for (j = 0; j < ysize; j++) {
#pragma pipeloop(0)
      for (i = 0; i < xsize / 8; i++) {
        sd0 = *sp++;
        sd1 = *sp++;
        CHANNELEXTRACT_U8_21L(sd0, sd1, dd);
        *dp++ = dd;
      }

      sp = sl = (mlib_d64 *) ((mlib_u8 *) sl + slb);
      dp = dl = (mlib_d64 *) ((mlib_u8 *) dl + dlb);
    }
  }
  else {
    for (j = 0; j < ysize; j++) {
#pragma pipeloop(0)
      for (i = 0; i < xsize / 8; i++) {
        sd0 = *sp++;
        sd1 = *sp++;
        CHANNELEXTRACT_U8_21R(sd0, sd1, dd);
        *dp++ = dd;
      }

      sp = sl = (mlib_d64 *) ((mlib_u8 *) sl + slb);
      dp = dl = (mlib_d64 *) ((mlib_u8 *) dl + dlb);
    }
  }
}

/***************************************************************/
/* extract one channel from a 2-channel image.
 */

void mlib_v_ImageChannelExtract_U8_21_D1(const mlib_u8 *src,
                                         mlib_u8       *dst,
                                         mlib_s32      dsize,
                                         mlib_s32      cmask)
{
  mlib_u8 *sa, *da;
  mlib_u8 *dend, *dend2;                              /* end points in dst */
  mlib_d64 *dp;                                       /* 8-byte aligned start points in dst */
  mlib_d64 *sp;                                       /* 8-byte aligned start point in src */
  mlib_d64 sd0, sd1, sd2, sd3;                        /* 8-byte source data */
  mlib_d64 sda, sdb, sdc, sdd;
  mlib_d64 dd0, dd1;
  mlib_s32 soff;                                      /* offset of address in src */
  mlib_s32 doff;                                      /* offset of address in dst */
  mlib_s32 off;                                       /* offset of src over dst */
  mlib_s32 emask;                                     /* edge mask */
  mlib_s32 i, n;

  sa = (void *)src;
  da = dst;

  /* prepare the source address */
  sp = (mlib_d64 *) ((mlib_addr) sa & (~7));
  soff = ((mlib_addr) sa & 7);

  /* prepare the destination addresses */
  dp = (mlib_d64 *) ((mlib_addr) da & (~7));
  doff = ((mlib_addr) da & 7);
  dend = da + dsize - 1;
  dend2 = dend - 7;

  /* calculate the src's offset over dst */
  if (cmask == 2) {
    off = soff / 2 - doff;
  }
  else {
    off = (soff + 1) / 2 - doff;
  }

  if (((cmask == 2) && (soff % 2 == 0)) || ((cmask == 1) && (soff % 2 != 0))) { /* extract even bytes */

    if (off == 0) {                         /* src and dst have same alignment */

      /* generate edge mask for the start point */
      emask = vis_edge8(da, dend);

      /* load 16 bytes */
      sd0 = *sp++;
      sd1 = *sp++;

      /* extract, including some garbage at the start point */
      CHANNELEXTRACT_U8_21L(sd0, sd1, dd0);

      /* store 8 bytes result */
      vis_pst_8(dd0, dp++, emask);

      if ((mlib_addr) dp <= (mlib_addr) dend2) {
        n = ((mlib_u8 *) dend2 - (mlib_u8 *) dp) / 8 + 1;

        /* 8-pixel column loop, emask not needed */
#pragma pipeloop(0)
        for (i = 0; i < n; i++) {
          sd0 = *sp++;
          sd1 = *sp++;
          CHANNELEXTRACT_U8_21L(sd0, sd1, dd0);
          *dp++ = dd0;
        }
      }

      /* end point handling */
      if ((mlib_addr) dp <= (mlib_addr) dend) {
        emask = vis_edge8(dp, dend);
        sd0 = *sp++;
        sd1 = *sp++;
        CHANNELEXTRACT_U8_21L(sd0, sd1, dd0);
        vis_pst_8(dd0, dp++, emask);
      }
    }
    else {
      vis_alignaddr((void *)0, off);

      /* generate edge mask for the start point */
      emask = vis_edge8(da, dend);

      if (off < 0) {
        /* load 16 bytes */
        sd2 = *sp++;
        sd3 = *sp++;

        /* extract and store 8 bytes */
        CHANNELEXTRACT_U8_21L(sd2, sd3, dd1);
        vis_pst_8(vis_faligndata(dd1, dd1), dp++, emask);
      }
      else {
        /* load 32 bytes */
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        sd3 = *sp++;

        /* extract and store 8 bytes */
        CHANNELEXTRACT_U8_21L(sd0, sd1, dd0);
        CHANNELEXTRACT_U8_21L(sd2, sd3, dd1);
        vis_pst_8(vis_faligndata(dd0, dd1), dp++, emask);
      }

      if ((mlib_addr) dp <= (mlib_addr) dend2) {
        n = ((mlib_u8 *) dend2 - (mlib_u8 *) dp) / 8 + 1;

        /* 8-pixel column loop, emask not needed */
#pragma pipeloop(0)
        for (i = 0; i < n; i++) {
          dd0 = dd1;
          sd2 = *sp++;
          sd3 = *sp++;
          CHANNELEXTRACT_U8_21L(sd2, sd3, dd1);
          *dp++ = vis_faligndata(dd0, dd1);
        }
      }

      /* end point handling */
      if ((mlib_addr) dp <= (mlib_addr) dend) {
        emask = vis_edge8(dp, dend);
        dd0 = dd1;
        sd2 = *sp++;
        sd3 = *sp++;
        CHANNELEXTRACT_U8_21L(sd2, sd3, dd1);
        vis_pst_8(vis_faligndata(dd0, dd1), dp++, emask);
      }
    }
  }
  else {                                    /* extract odd bytes */

    if (off == 0) {                         /* src and dst have same alignment */

      /* generate edge mask for the start point */
      emask = vis_edge8(da, dend);

      /* load 16 bytes, don't care the garbage at the start point */
      sd0 = *sp++;
      sd1 = *sp++;

      /* extract and store 8 bytes */
      CHANNELEXTRACT_U8_21R(sd0, sd1, dd0);
      vis_pst_8(dd0, dp++, emask);

      if ((mlib_addr) dp <= (mlib_addr) dend2) {
        n = ((mlib_u8 *) dend2 - (mlib_u8 *) dp) / 8 + 1;

        /* 8-pixel column loop, emask not needed */
#pragma pipeloop(0)
        for (i = 0; i < n; i++) {
          sd0 = *sp++;
          sd1 = *sp++;
          CHANNELEXTRACT_U8_21R(sd0, sd1, dd0);
          *dp++ = dd0;
        }
      }

      /* end point handling */
      if ((mlib_addr) dp <= (mlib_addr) dend) {
        emask = vis_edge8(dp, dend);
        sd0 = *sp++;
        sd1 = *sp++;
        CHANNELEXTRACT_U8_21R(sd0, sd1, dd0);
        vis_pst_8(dd0, dp++, emask);
      }
    }
    else {
      vis_alignaddr((void *)0, off);

      /* generate edge mask for the start point */
      emask = vis_edge8(da, dend);

      if (off < 0) {
        /* load 16 bytes */
        sd2 = *sp++;
        sd3 = *sp++;

        /* extract and store 8 bytes */
        CHANNELEXTRACT_U8_21R(sd2, sd3, dd1);
        vis_pst_8(vis_faligndata(dd1, dd1), dp++, emask);
      }
      else {
        /* load 32 bytes */
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        sd3 = *sp++;

        /* extract and store 8 bytes */
        CHANNELEXTRACT_U8_21R(sd0, sd1, dd0);
        CHANNELEXTRACT_U8_21R(sd2, sd3, dd1);
        vis_pst_8(vis_faligndata(dd0, dd1), dp++, emask);
      }

      if ((mlib_addr) dp <= (mlib_addr) dend2) {
        n = ((mlib_u8 *) dend2 - (mlib_u8 *) dp) / 8 + 1;

        /* 8-pixel column loop, emask not needed */
#pragma pipeloop(0)
        for (i = 0; i < n; i++) {
          dd0 = dd1;
          sd2 = *sp++;
          sd3 = *sp++;
          CHANNELEXTRACT_U8_21R(sd2, sd3, dd1);
          *dp++ = vis_faligndata(dd0, dd1);
        }
      }

      /* end point handling */
      if ((mlib_addr) dp <= (mlib_addr) dend) {
        emask = vis_edge8(dp, dend);
        dd0 = dd1;
        sd2 = *sp++;
        sd3 = *sp++;
        CHANNELEXTRACT_U8_21R(sd2, sd3, dd1);
        vis_pst_8(vis_faligndata(dd0, dd1), dp++, emask);
      }
    }
  }
}

/***************************************************************/
/* extract one channel from a 2-channel image.
 */

void mlib_v_ImageChannelExtract_U8_21(const mlib_u8 *src,
                                      mlib_s32      slb,
                                      mlib_u8       *dst,
                                      mlib_s32      dlb,
                                      mlib_s32      xsize,
                                      mlib_s32      ysize,
                                      mlib_s32      cmask)
{
  mlib_u8 *sa, *da;
  mlib_u8 *sl, *dl;
  mlib_s32 j;

  sa = sl = (void *)src;
  da = dl = dst;

  for (j = 0; j < ysize; j++) {
    mlib_v_ImageChannelExtract_U8_21_D1(sa, da, xsize, cmask);
    sa = sl += slb;
    da = dl += dlb;
  }
}

/***************************************************************/
#define CHANNELEXTRACT_U8_31L(sd0, sd1, sd2, dd)                \
  sda = vis_fpmerge(vis_read_hi(sd0), vis_read_lo(sd1));        \
  sdb = vis_fpmerge(vis_read_lo(sd0), vis_read_hi(sd2));        \
  sdc = vis_fpmerge(vis_read_hi(sd1), vis_read_lo(sd2));        \
  sdd = vis_fpmerge(vis_read_hi(sda), vis_read_lo(sdb));        \
  sde = vis_fpmerge(vis_read_lo(sda), vis_read_hi(sdc));        \
  dd  = vis_fpmerge(vis_read_hi(sdd), vis_read_lo(sde))

/***************************************************************/
#define CHANNELEXTRACT_U8_31M(sd0, sd1, sd2, dd)                \
  sda = vis_fpmerge(vis_read_hi(sd0), vis_read_lo(sd1));        \
  sdb = vis_fpmerge(vis_read_lo(sd0), vis_read_hi(sd2));        \
  sdc = vis_fpmerge(vis_read_hi(sd1), vis_read_lo(sd2));        \
  sdd = vis_fpmerge(vis_read_hi(sda), vis_read_lo(sdb));        \
  sde = vis_fpmerge(vis_read_hi(sdb), vis_read_lo(sdc));        \
  dd  = vis_fpmerge(vis_read_lo(sdd), vis_read_hi(sde))

/***************************************************************/
#define CHANNELEXTRACT_U8_31R(sd0, sd1, sd2, dd)                \
  sda = vis_fpmerge(vis_read_hi(sd0), vis_read_lo(sd1));        \
  sdb = vis_fpmerge(vis_read_lo(sd0), vis_read_hi(sd2));        \
  sdc = vis_fpmerge(vis_read_hi(sd1), vis_read_lo(sd2));        \
  sdd = vis_fpmerge(vis_read_lo(sda), vis_read_hi(sdc));        \
  sde = vis_fpmerge(vis_read_hi(sdb), vis_read_lo(sdc));        \
  dd  = vis_fpmerge(vis_read_hi(sdd), vis_read_lo(sde))

/***************************************************************/
void mlib_v_ImageChannelExtract_U8_31_A8D1X8(const mlib_u8 *src,
                                             mlib_u8       *dst,
                                             mlib_s32      dsize,
                                             mlib_s32      cmask)
{
  mlib_d64 *sp, *dp;
  mlib_d64 sd0, sd1, sd2;
  mlib_d64 sda, sdb, sdc, sdd, sde;
  mlib_d64 dd;
  mlib_s32 i;

  sp = (mlib_d64 *) src;
  dp = (mlib_d64 *) dst;

  if (cmask == 4) {
#pragma pipeloop(0)
    for (i = 0; i < dsize / 8; i++) {
      sd0 = *sp++;
      sd1 = *sp++;
      sd2 = *sp++;
      CHANNELEXTRACT_U8_31L(sd0, sd1, sd2, dd);
      *dp++ = dd;
    }
  }
  else if (cmask == 2) {
#pragma pipeloop(0)
    for (i = 0; i < dsize / 8; i++) {
      sd0 = *sp++;
      sd1 = *sp++;
      sd2 = *sp++;
      CHANNELEXTRACT_U8_31M(sd0, sd1, sd2, dd);
      *dp++ = dd;
    }
  }
  else {
#pragma pipeloop(0)
    for (i = 0; i < dsize / 8; i++) {
      sd0 = *sp++;
      sd1 = *sp++;
      sd2 = *sp++;
      CHANNELEXTRACT_U8_31R(sd0, sd1, sd2, dd);
      *dp++ = dd;
    }
  }
}

/***************************************************************/
void mlib_v_ImageChannelExtract_U8_31_A8D2X8(const mlib_u8 *src,
                                             mlib_s32      slb,
                                             mlib_u8       *dst,
                                             mlib_s32      dlb,
                                             mlib_s32      xsize,
                                             mlib_s32      ysize,
                                             mlib_s32      cmask)
{
  mlib_d64 *sp, *dp;
  mlib_d64 *sl, *dl;
  mlib_d64 sd0, sd1, sd2;
  mlib_d64 sda, sdb, sdc, sdd, sde;
  mlib_d64 dd;
  mlib_s32 i, j;

  sp = sl = (mlib_d64 *) src;
  dp = dl = (mlib_d64 *) dst;

  if (cmask == 4) {
    for (j = 0; j < ysize; j++) {
#pragma pipeloop(0)
      for (i = 0; i < xsize / 8; i++) {
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        CHANNELEXTRACT_U8_31L(sd0, sd1, sd2, dd);
        *dp++ = dd;
      }

      sp = sl = (mlib_d64 *) ((mlib_u8 *) sl + slb);
      dp = dl = (mlib_d64 *) ((mlib_u8 *) dl + dlb);
    }
  }
  else if (cmask == 2) {
    for (j = 0; j < ysize; j++) {
#pragma pipeloop(0)
      for (i = 0; i < xsize / 8; i++) {
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        CHANNELEXTRACT_U8_31M(sd0, sd1, sd2, dd);
        *dp++ = dd;
      }

      sp = sl = (mlib_d64 *) ((mlib_u8 *) sl + slb);
      dp = dl = (mlib_d64 *) ((mlib_u8 *) dl + dlb);
    }
  }
  else {
    for (j = 0; j < ysize; j++) {
#pragma pipeloop(0)
      for (i = 0; i < xsize / 8; i++) {
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        CHANNELEXTRACT_U8_31R(sd0, sd1, sd2, dd);
        *dp++ = dd;
      }

      sp = sl = (mlib_d64 *) ((mlib_u8 *) sl + slb);
      dp = dl = (mlib_d64 *) ((mlib_u8 *) dl + dlb);
    }
  }
}

/***************************************************************/
void mlib_v_ImageChannelExtract_U8_31_D1(const mlib_u8 *src,
                                         mlib_u8       *dst,
                                         mlib_s32      dsize,
                                         mlib_s32      cmask)
{
  mlib_u8 *sa, *da;
  mlib_u8 *dend, *dend2;                              /* end points in dst */
  mlib_d64 *dp;                                       /* 8-byte aligned start points in dst */
  mlib_d64 *sp;                                       /* 8-byte aligned start point in src */
  mlib_d64 sd0, sd1, sd2;                             /* 8-byte source data */
  mlib_d64 sd3, sd4, sd5;
  mlib_d64 sda, sdb, sdc, sdd, sde;
  mlib_d64 dd0, dd1;
  mlib_s32 soff;                                      /* offset of address in src */
  mlib_s32 doff;                                      /* offset of address in dst */
  mlib_s32 off;                                       /* offset of src over dst */
  mlib_s32 emask;                                     /* edge mask */
  mlib_s32 i, n;

  sa = (void *)src;
  da = dst;

  /* prepare the source address */
  sp = (mlib_d64 *) ((mlib_addr) sa & (~7));
  soff = ((mlib_addr) sa & 7);

  /* prepare the destination addresses */
  dp = (mlib_d64 *) ((mlib_addr) da & (~7));
  doff = ((mlib_addr) da & 7);
  dend = da + dsize - 1;
  dend2 = dend - 7;

  /* calculate the src's offset over dst */
  if (cmask == 4) {
    off = soff / 3 - doff;
  }
  else if (cmask == 2) {
    off = (soff + 1) / 3 - doff;
  }
  else {
    off = (soff + 2) / 3 - doff;
  }

  if (((cmask == 4) && (soff % 3 == 0)) ||
      ((cmask == 2) && (soff % 3 == 2)) ||
      ((cmask == 1) && (soff % 3 == 1))) { /* extract left channel */

    if (off == 0) {                         /* src and dst have same alignment */

      /* generate edge mask for the start point */
      emask = vis_edge8(da, dend);

      /* load 16 bytes */
      sd0 = *sp++;
      sd1 = *sp++;
      sd2 = *sp++;

      /* extract, including some garbage at the start point */
      CHANNELEXTRACT_U8_31L(sd0, sd1, sd2, dd0);

      /* store 8 bytes result */
      vis_pst_8(dd0, dp++, emask);

      if ((mlib_addr) dp <= (mlib_addr) dend2) {
        n = ((mlib_u8 *) dend2 - (mlib_u8 *) dp) / 8 + 1;

        /* 8-pixel column loop, emask not needed */
#pragma pipeloop(0)
        for (i = 0; i < n; i++) {
          sd0 = *sp++;
          sd1 = *sp++;
          sd2 = *sp++;
          CHANNELEXTRACT_U8_31L(sd0, sd1, sd2, dd0);
          *dp++ = dd0;
        }
      }

      /* end point handling */
      if ((mlib_addr) dp <= (mlib_addr) dend) {
        emask = vis_edge8(dp, dend);
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        CHANNELEXTRACT_U8_31L(sd0, sd1, sd2, dd0);
        vis_pst_8(dd0, dp++, emask);
      }
    }
    else {
      vis_alignaddr((void *)0, off);

      /* generate edge mask for the start point */
      emask = vis_edge8(da, dend);

      if (off < 0) {
        /* load 24 bytes */
        sd3 = *sp++;
        sd4 = *sp++;
        sd5 = *sp++;

        /* extract and store 8 bytes */
        CHANNELEXTRACT_U8_31L(sd3, sd4, sd5, dd1);
        vis_pst_8(vis_faligndata(dd1, dd1), dp++, emask);
      }
      else {
        /* load 48 bytes */
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        sd3 = *sp++;
        sd4 = *sp++;
        sd5 = *sp++;

        /* extract and store 8 bytes */
        CHANNELEXTRACT_U8_31L(sd0, sd1, sd2, dd0);
        CHANNELEXTRACT_U8_31L(sd3, sd4, sd5, dd1);
        vis_pst_8(vis_faligndata(dd0, dd1), dp++, emask);
      }

      if ((mlib_addr) dp <= (mlib_addr) dend2) {
        n = ((mlib_u8 *) dend2 - (mlib_u8 *) dp) / 8 + 1;

        /* 8-pixel column loop, emask not needed */
#pragma pipeloop(0)
        for (i = 0; i < n; i++) {
          dd0 = dd1;
          sd3 = *sp++;
          sd4 = *sp++;
          sd5 = *sp++;
          CHANNELEXTRACT_U8_31L(sd3, sd4, sd5, dd1);
          *dp++ = vis_faligndata(dd0, dd1);
        }
      }

      /* end point handling */
      if ((mlib_addr) dp <= (mlib_addr) dend) {
        emask = vis_edge8(dp, dend);
        dd0 = dd1;
        sd3 = *sp++;
        sd4 = *sp++;
        sd5 = *sp++;
        CHANNELEXTRACT_U8_31L(sd3, sd4, sd5, dd1);
        vis_pst_8(vis_faligndata(dd0, dd1), dp++, emask);
      }
    }
  }
  else if (((cmask == 4) && (soff % 3 == 1)) ||
           ((cmask == 2) && (soff % 3 == 0)) ||
           ((cmask == 1) && (soff % 3 == 2))) {
    /* extract middle channel */

    if (off == 0) {                         /* src and dst have same alignment */

      /* generate edge mask for the start point */
      emask = vis_edge8(da, dend);

      /* load 16 bytes */
      sd0 = *sp++;
      sd1 = *sp++;
      sd2 = *sp++;

      /* extract, including some garbage at the start point */
      CHANNELEXTRACT_U8_31M(sd0, sd1, sd2, dd0);

      /* store 8 bytes result */
      vis_pst_8(dd0, dp++, emask);

      if ((mlib_addr) dp <= (mlib_addr) dend2) {
        n = ((mlib_u8 *) dend2 - (mlib_u8 *) dp) / 8 + 1;

        /* 8-pixel column loop, emask not needed */
#pragma pipeloop(0)
        for (i = 0; i < n; i++) {
          sd0 = *sp++;
          sd1 = *sp++;
          sd2 = *sp++;
          CHANNELEXTRACT_U8_31M(sd0, sd1, sd2, dd0);
          *dp++ = dd0;
        }
      }

      /* end point handling */
      if ((mlib_addr) dp <= (mlib_addr) dend) {
        emask = vis_edge8(dp, dend);
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        CHANNELEXTRACT_U8_31M(sd0, sd1, sd2, dd0);
        vis_pst_8(dd0, dp++, emask);
      }
    }
    else {
      vis_alignaddr((void *)0, off);

      /* generate edge mask for the start point */
      emask = vis_edge8(da, dend);

      if (off < 0) {
        /* load 24 bytes */
        sd3 = *sp++;
        sd4 = *sp++;
        sd5 = *sp++;

        /* extract and store 8 bytes */
        CHANNELEXTRACT_U8_31M(sd3, sd4, sd5, dd1);
        vis_pst_8(vis_faligndata(dd1, dd1), dp++, emask);
      }
      else {
        /* load 48 bytes */
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        sd3 = *sp++;
        sd4 = *sp++;
        sd5 = *sp++;

        /* extract and store 8 bytes */
        CHANNELEXTRACT_U8_31M(sd0, sd1, sd2, dd0);
        CHANNELEXTRACT_U8_31M(sd3, sd4, sd5, dd1);
        vis_pst_8(vis_faligndata(dd0, dd1), dp++, emask);
      }

      if ((mlib_addr) dp <= (mlib_addr) dend2) {
        n = ((mlib_u8 *) dend2 - (mlib_u8 *) dp) / 8 + 1;

        /* 8-pixel column loop, emask not needed */
#pragma pipeloop(0)
        for (i = 0; i < n; i++) {
          dd0 = dd1;
          sd3 = *sp++;
          sd4 = *sp++;
          sd5 = *sp++;
          CHANNELEXTRACT_U8_31M(sd3, sd4, sd5, dd1);
          *dp++ = vis_faligndata(dd0, dd1);
        }
      }

      /* end point handling */
      if ((mlib_addr) dp <= (mlib_addr) dend) {
        emask = vis_edge8(dp, dend);
        dd0 = dd1;
        sd3 = *sp++;
        sd4 = *sp++;
        sd5 = *sp++;
        CHANNELEXTRACT_U8_31M(sd3, sd4, sd5, dd1);
        vis_pst_8(vis_faligndata(dd0, dd1), dp++, emask);
      }
    }
  }
  else {                                    /* extract right channel */

    if (off == 0) {                         /* src and dst have same alignment */

      /* generate edge mask for the start point */
      emask = vis_edge8(da, dend);

      /* load 16 bytes */
      sd0 = *sp++;
      sd1 = *sp++;
      sd2 = *sp++;

      /* extract, including some garbage at the start point */
      CHANNELEXTRACT_U8_31R(sd0, sd1, sd2, dd0);

      /* store 8 bytes result */
      vis_pst_8(dd0, dp++, emask);

      if ((mlib_addr) dp <= (mlib_addr) dend2) {
        n = ((mlib_u8 *) dend2 - (mlib_u8 *) dp) / 8 + 1;

        /* 8-pixel column loop, emask not needed */
#pragma pipeloop(0)
        for (i = 0; i < n; i++) {
          sd0 = *sp++;
          sd1 = *sp++;
          sd2 = *sp++;
          CHANNELEXTRACT_U8_31R(sd0, sd1, sd2, dd0);
          *dp++ = dd0;
        }
      }

      /* end point handling */
      if ((mlib_addr) dp <= (mlib_addr) dend) {
        emask = vis_edge8(dp, dend);
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        CHANNELEXTRACT_U8_31R(sd0, sd1, sd2, dd0);
        vis_pst_8(dd0, dp++, emask);
      }
    }
    else {
      vis_alignaddr((void *)0, off);

      /* generate edge mask for the start point */
      emask = vis_edge8(da, dend);

      if (off < 0) {
        /* load 24 bytes */
        sd3 = *sp++;
        sd4 = *sp++;
        sd5 = *sp++;

        /* extract and store 8 bytes */
        CHANNELEXTRACT_U8_31R(sd3, sd4, sd5, dd1);
        vis_pst_8(vis_faligndata(dd1, dd1), dp++, emask);
      }
      else {
        /* load 48 bytes */
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        sd3 = *sp++;
        sd4 = *sp++;
        sd5 = *sp++;

        /* extract and store 8 bytes */
        CHANNELEXTRACT_U8_31R(sd0, sd1, sd2, dd0);
        CHANNELEXTRACT_U8_31R(sd3, sd4, sd5, dd1);
        vis_pst_8(vis_faligndata(dd0, dd1), dp++, emask);
      }

      if ((mlib_addr) dp <= (mlib_addr) dend2) {
        n = ((mlib_u8 *) dend2 - (mlib_u8 *) dp) / 8 + 1;

        /* 8-pixel column loop, emask not needed */
#pragma pipeloop(0)
        for (i = 0; i < n; i++) {
          dd0 = dd1;
          sd3 = *sp++;
          sd4 = *sp++;
          sd5 = *sp++;
          CHANNELEXTRACT_U8_31R(sd3, sd4, sd5, dd1);
          *dp++ = vis_faligndata(dd0, dd1);
        }
      }

      /* end point handling */
      if ((mlib_addr) dp <= (mlib_addr) dend) {
        emask = vis_edge8(dp, dend);
        dd0 = dd1;
        sd3 = *sp++;
        sd4 = *sp++;
        sd5 = *sp++;
        CHANNELEXTRACT_U8_31R(sd3, sd4, sd5, dd1);
        vis_pst_8(vis_faligndata(dd0, dd1), dp++, emask);
      }
    }
  }
}

/***************************************************************/
void mlib_v_ImageChannelExtract_U8_31(const mlib_u8 *src,
                                      mlib_s32      slb,
                                      mlib_u8       *dst,
                                      mlib_s32      dlb,
                                      mlib_s32      xsize,
                                      mlib_s32      ysize,
                                      mlib_s32      cmask)
{
  mlib_u8 *sa, *da;
  mlib_u8 *sl, *dl;
  mlib_s32 j;

  sa = sl = (void *)src;
  da = dl = dst;

  for (j = 0; j < ysize; j++) {
    mlib_v_ImageChannelExtract_U8_31_D1(sa, da, xsize, cmask);
    sa = sl += slb;
    da = dl += dlb;
  }
}

/***************************************************************/
#define CHANNELEXTRACT_U8_41L(sd0, sd1, sd2, sd3, dd)           \
  sda = vis_fpmerge(vis_read_hi(sd0), vis_read_hi(sd2));        \
  sdb = vis_fpmerge(vis_read_lo(sd0), vis_read_lo(sd2));        \
  sdc = vis_fpmerge(vis_read_hi(sd1), vis_read_hi(sd3));        \
  sdd = vis_fpmerge(vis_read_lo(sd1), vis_read_lo(sd3));        \
  sde = vis_fpmerge(vis_read_hi(sda), vis_read_hi(sdc));        \
  sdf = vis_fpmerge(vis_read_hi(sdb), vis_read_hi(sdd));        \
  dd  = vis_fpmerge(vis_read_hi(sde), vis_read_hi(sdf))

/***************************************************************/
#define CHANNELEXTRACT_U8_41ML(sd0, sd1, sd2, sd3, dd)          \
  sda = vis_fpmerge(vis_read_hi(sd0), vis_read_hi(sd2));        \
  sdb = vis_fpmerge(vis_read_lo(sd0), vis_read_lo(sd2));        \
  sdc = vis_fpmerge(vis_read_hi(sd1), vis_read_hi(sd3));        \
  sdd = vis_fpmerge(vis_read_lo(sd1), vis_read_lo(sd3));        \
  sde = vis_fpmerge(vis_read_hi(sda), vis_read_hi(sdc));        \
  sdf = vis_fpmerge(vis_read_hi(sdb), vis_read_hi(sdd));        \
  dd  = vis_fpmerge(vis_read_lo(sde), vis_read_lo(sdf))

/***************************************************************/
#define CHANNELEXTRACT_U8_41MR(sd0, sd1, sd2, sd3, dd)          \
  sda = vis_fpmerge(vis_read_hi(sd0), vis_read_hi(sd2));        \
  sdb = vis_fpmerge(vis_read_lo(sd0), vis_read_lo(sd2));        \
  sdc = vis_fpmerge(vis_read_hi(sd1), vis_read_hi(sd3));        \
  sdd = vis_fpmerge(vis_read_lo(sd1), vis_read_lo(sd3));        \
  sde = vis_fpmerge(vis_read_lo(sda), vis_read_lo(sdc));        \
  sdf = vis_fpmerge(vis_read_lo(sdb), vis_read_lo(sdd));        \
  dd  = vis_fpmerge(vis_read_hi(sde), vis_read_hi(sdf))

/***************************************************************/
#define CHANNELEXTRACT_U8_41R(sd0, sd1, sd2, sd3, dd)           \
  sda = vis_fpmerge(vis_read_hi(sd0), vis_read_hi(sd2));        \
  sdb = vis_fpmerge(vis_read_lo(sd0), vis_read_lo(sd2));        \
  sdc = vis_fpmerge(vis_read_hi(sd1), vis_read_hi(sd3));        \
  sdd = vis_fpmerge(vis_read_lo(sd1), vis_read_lo(sd3));        \
  sde = vis_fpmerge(vis_read_lo(sda), vis_read_lo(sdc));        \
  sdf = vis_fpmerge(vis_read_lo(sdb), vis_read_lo(sdd));        \
  dd  = vis_fpmerge(vis_read_lo(sde), vis_read_lo(sdf))

/***************************************************************/
void mlib_v_ImageChannelExtract_U8_41_A8D1X8(const mlib_u8 *src,
                                             mlib_u8       *dst,
                                             mlib_s32      dsize,
                                             mlib_s32      cmask)
{
  mlib_d64 *sp, *dp;
  mlib_d64 sd0, sd1, sd2, sd3;
  mlib_d64 sda, sdb, sdc, sdd, sde, sdf;
  mlib_d64 dd;
  mlib_s32 i;

  sp = (mlib_d64 *) src;
  dp = (mlib_d64 *) dst;

  if (cmask == 8) {
#pragma pipeloop(0)
    for (i = 0; i < dsize / 8; i++) {
      sd0 = *sp++;
      sd1 = *sp++;
      sd2 = *sp++;
      sd3 = *sp++;
      CHANNELEXTRACT_U8_41L(sd0, sd1, sd2, sd3, dd);
      *dp++ = dd;
    }
  }
  else if (cmask == 4) {
#pragma pipeloop(0)
    for (i = 0; i < dsize / 8; i++) {
      sd0 = *sp++;
      sd1 = *sp++;
      sd2 = *sp++;
      sd3 = *sp++;
      CHANNELEXTRACT_U8_41ML(sd0, sd1, sd2, sd3, dd);
      *dp++ = dd;
    }
  }
  else if (cmask == 2) {
#pragma pipeloop(0)
    for (i = 0; i < dsize / 8; i++) {
      sd0 = *sp++;
      sd1 = *sp++;
      sd2 = *sp++;
      sd3 = *sp++;
      CHANNELEXTRACT_U8_41MR(sd0, sd1, sd2, sd3, dd);
      *dp++ = dd;
    }
  }
  else {
#pragma pipeloop(0)
    for (i = 0; i < dsize / 8; i++) {
      sd0 = *sp++;
      sd1 = *sp++;
      sd2 = *sp++;
      sd3 = *sp++;
      CHANNELEXTRACT_U8_41R(sd0, sd1, sd2, sd3, dd);
      *dp++ = dd;
    }
  }
}

/***************************************************************/
void mlib_v_ImageChannelExtract_U8_41_A8D2X8(const mlib_u8 *src,
                                             mlib_s32      slb,
                                             mlib_u8       *dst,
                                             mlib_s32      dlb,
                                             mlib_s32      xsize,
                                             mlib_s32      ysize,
                                             mlib_s32      cmask)
{
  mlib_d64 *sp, *dp;
  mlib_d64 *sl, *dl;
  mlib_d64 sd0, sd1, sd2, sd3;
  mlib_d64 sda, sdb, sdc, sdd, sde, sdf;
  mlib_d64 dd;
  mlib_s32 i, j;

  sp = sl = (mlib_d64 *) src;
  dp = dl = (mlib_d64 *) dst;

  if (cmask == 8) {
    for (j = 0; j < ysize; j++) {
#pragma pipeloop(0)
      for (i = 0; i < xsize / 8; i++) {
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        sd3 = *sp++;
        CHANNELEXTRACT_U8_41L(sd0, sd1, sd2, sd3, dd);
        *dp++ = dd;
      }

      sp = sl = (mlib_d64 *) ((mlib_u8 *) sl + slb);
      dp = dl = (mlib_d64 *) ((mlib_u8 *) dl + dlb);
    }
  }
  else if (cmask == 4) {
    for (j = 0; j < ysize; j++) {
#pragma pipeloop(0)
      for (i = 0; i < xsize / 8; i++) {
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        sd3 = *sp++;
        CHANNELEXTRACT_U8_41ML(sd0, sd1, sd2, sd3, dd);
        *dp++ = dd;
      }

      sp = sl = (mlib_d64 *) ((mlib_u8 *) sl + slb);
      dp = dl = (mlib_d64 *) ((mlib_u8 *) dl + dlb);
    }
  }
  else if (cmask == 2) {
    for (j = 0; j < ysize; j++) {
#pragma pipeloop(0)
      for (i = 0; i < xsize / 8; i++) {
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        sd3 = *sp++;
        CHANNELEXTRACT_U8_41MR(sd0, sd1, sd2, sd3, dd);
        *dp++ = dd;
      }

      sp = sl = (mlib_d64 *) ((mlib_u8 *) sl + slb);
      dp = dl = (mlib_d64 *) ((mlib_u8 *) dl + dlb);
    }
  }
  else {
    for (j = 0; j < ysize; j++) {
#pragma pipeloop(0)
      for (i = 0; i < xsize / 8; i++) {
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        sd3 = *sp++;
        CHANNELEXTRACT_U8_41R(sd0, sd1, sd2, sd3, dd);
        *dp++ = dd;
      }

      sp = sl = (mlib_d64 *) ((mlib_u8 *) sl + slb);
      dp = dl = (mlib_d64 *) ((mlib_u8 *) dl + dlb);
    }
  }
}

/***************************************************************/
void mlib_v_ImageChannelExtract_U8_41_D1(const mlib_u8 *src,
                                         mlib_u8       *dst,
                                         mlib_s32      dsize,
                                         mlib_s32      cmask)
{
  mlib_u8 *sa, *da;
  mlib_u8 *dend, *dend2;                              /* end points in dst */
  mlib_d64 *dp;                                       /* 8-byte aligned start points in dst */
  mlib_d64 *sp;                                       /* 8-byte aligned start point in src */
  mlib_d64 sd0, sd1, sd2, sd3;                        /* 8-byte source data */
  mlib_d64 sd4, sd5, sd6, sd7;
  mlib_d64 sda, sdb, sdc, sdd;
  mlib_d64 sde, sdf;
  mlib_d64 dd0, dd1;
  mlib_s32 soff;                                      /* offset of address in src */
  mlib_s32 doff;                                      /* offset of address in dst */
  mlib_s32 off;                                       /* offset of src over dst */
  mlib_s32 emask;                                     /* edge mask */
  mlib_s32 i, n;

  sa = (void *)src;
  da = dst;

  /* prepare the source address */
  sp = (mlib_d64 *) ((mlib_addr) sa & (~7));
  soff = ((mlib_addr) sa & 7);

  /* prepare the destination addresses */
  dp = (mlib_d64 *) ((mlib_addr) da & (~7));
  doff = ((mlib_addr) da & 7);
  dend = da + dsize - 1;
  dend2 = dend - 7;

  /* calculate the src's offset over dst */
  if (cmask == 8) {
    off = soff / 4 - doff;
  }
  else if (cmask == 4) {
    off = (soff + 1) / 4 - doff;
  }
  else if (cmask == 2) {
    off = (soff + 2) / 4 - doff;
  }
  else {
    off = (soff + 3) / 4 - doff;
  }

  if (((cmask == 8) && (soff % 4 == 0)) ||
      ((cmask == 4) && (soff % 4 == 3)) ||
      ((cmask == 2) && (soff % 4 == 2)) ||
      ((cmask == 1) && (soff % 4 == 1))) { /* extract left channel */

    if (off == 0) {                         /* src and dst have same alignment */

      /* generate edge mask for the start point */
      emask = vis_edge8(da, dend);

      /* load 16 bytes */
      sd0 = *sp++;
      sd1 = *sp++;
      sd2 = *sp++;
      sd3 = *sp++;

      /* extract, including some garbage at the start point */
      CHANNELEXTRACT_U8_41L(sd0, sd1, sd2, sd3, dd0);

      /* store 8 bytes result */
      vis_pst_8(dd0, dp++, emask);

      if ((mlib_addr) dp <= (mlib_addr) dend2) {
        n = ((mlib_u8 *) dend2 - (mlib_u8 *) dp) / 8 + 1;

        /* 8-pixel column loop, emask not needed */
#pragma pipeloop(0)
        for (i = 0; i < n; i++) {
          sd0 = *sp++;
          sd1 = *sp++;
          sd2 = *sp++;
          sd3 = *sp++;
          CHANNELEXTRACT_U8_41L(sd0, sd1, sd2, sd3, dd0);
          *dp++ = dd0;
        }
      }

      /* end point handling */
      if ((mlib_addr) dp <= (mlib_addr) dend) {
        emask = vis_edge8(dp, dend);
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        sd3 = *sp++;
        CHANNELEXTRACT_U8_41L(sd0, sd1, sd2, sd3, dd0);
        vis_pst_8(dd0, dp++, emask);
      }
    }
    else {
      vis_alignaddr((void *)0, off);

      /* generate edge mask for the start point */
      emask = vis_edge8(da, dend);

      if (off < 0) {
        /* load 24 bytes */
        sd4 = *sp++;
        sd5 = *sp++;
        sd6 = *sp++;
        sd7 = *sp++;

        /* extract and store 8 bytes */
        CHANNELEXTRACT_U8_41L(sd4, sd5, sd6, sd7, dd1);
        vis_pst_8(vis_faligndata(dd1, dd1), dp++, emask);
      }
      else {
        /* load 48 bytes */
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        sd3 = *sp++;
        sd4 = *sp++;
        sd5 = *sp++;
        sd6 = *sp++;
        sd7 = *sp++;

        /* extract and store 8 bytes */
        CHANNELEXTRACT_U8_41L(sd0, sd1, sd2, sd3, dd0);
        CHANNELEXTRACT_U8_41L(sd4, sd5, sd6, sd7, dd1);
        vis_pst_8(vis_faligndata(dd0, dd1), dp++, emask);
      }

      if ((mlib_addr) dp <= (mlib_addr) dend2) {
        n = ((mlib_u8 *) dend2 - (mlib_u8 *) dp) / 8 + 1;

        /* 8-pixel column loop, emask not needed */
#pragma pipeloop(0)
        for (i = 0; i < n; i++) {
          dd0 = dd1;
          sd4 = *sp++;
          sd5 = *sp++;
          sd6 = *sp++;
          sd7 = *sp++;
          CHANNELEXTRACT_U8_41L(sd4, sd5, sd6, sd7, dd1);
          *dp++ = vis_faligndata(dd0, dd1);
        }
      }

      /* end point handling */
      if ((mlib_addr) dp <= (mlib_addr) dend) {
        emask = vis_edge8(dp, dend);
        dd0 = dd1;
        sd4 = *sp++;
        sd5 = *sp++;
        sd6 = *sp++;
        sd7 = *sp++;
        CHANNELEXTRACT_U8_41L(sd4, sd5, sd6, sd7, dd1);
        vis_pst_8(vis_faligndata(dd0, dd1), dp++, emask);
      }
    }
  }
  else if (((cmask == 8) && (soff % 4 == 1)) ||
           ((cmask == 4) && (soff % 4 == 0)) ||
           ((cmask == 2) && (soff % 4 == 3)) ||
           ((cmask == 1) && (soff % 4 == 2))) {
    /* extract middle left channel */

    if (off == 0) {                         /* src and dst have same alignment */

      /* generate edge mask for the start point */
      emask = vis_edge8(da, dend);

      /* load 16 bytes */
      sd0 = *sp++;
      sd1 = *sp++;
      sd2 = *sp++;
      sd3 = *sp++;

      /* extract, including some garbage at the start point */
      CHANNELEXTRACT_U8_41ML(sd0, sd1, sd2, sd3, dd0);

      /* store 8 bytes result */
      vis_pst_8(dd0, dp++, emask);

      if ((mlib_addr) dp <= (mlib_addr) dend2) {
        n = ((mlib_u8 *) dend2 - (mlib_u8 *) dp) / 8 + 1;

        /* 8-pixel column loop, emask not needed */
#pragma pipeloop(0)
        for (i = 0; i < n; i++) {
          sd0 = *sp++;
          sd1 = *sp++;
          sd2 = *sp++;
          sd3 = *sp++;
          CHANNELEXTRACT_U8_41ML(sd0, sd1, sd2, sd3, dd0);
          *dp++ = dd0;
        }
      }

      /* end point handling */
      if ((mlib_addr) dp <= (mlib_addr) dend) {
        emask = vis_edge8(dp, dend);
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        sd3 = *sp++;
        CHANNELEXTRACT_U8_41ML(sd0, sd1, sd2, sd3, dd0);
        vis_pst_8(dd0, dp++, emask);
      }
    }
    else {
      vis_alignaddr((void *)0, off);

      /* generate edge mask for the start point */
      emask = vis_edge8(da, dend);

      if (off < 0) {
        /* load 24 bytes */
        sd4 = *sp++;
        sd5 = *sp++;
        sd6 = *sp++;
        sd7 = *sp++;

        /* extract and store 8 bytes */
        CHANNELEXTRACT_U8_41ML(sd4, sd5, sd6, sd7, dd1);
        vis_pst_8(vis_faligndata(dd1, dd1), dp++, emask);
      }
      else {
        /* load 48 bytes */
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        sd3 = *sp++;
        sd4 = *sp++;
        sd5 = *sp++;
        sd6 = *sp++;
        sd7 = *sp++;

        /* extract and store 8 bytes */
        CHANNELEXTRACT_U8_41ML(sd0, sd1, sd2, sd3, dd0);
        CHANNELEXTRACT_U8_41ML(sd4, sd5, sd6, sd7, dd1);
        vis_pst_8(vis_faligndata(dd0, dd1), dp++, emask);
      }

      if ((mlib_addr) dp <= (mlib_addr) dend2) {
        n = ((mlib_u8 *) dend2 - (mlib_u8 *) dp) / 8 + 1;

        /* 8-pixel column loop, emask not needed */
#pragma pipeloop(0)
        for (i = 0; i < n; i++) {
          dd0 = dd1;
          sd4 = *sp++;
          sd5 = *sp++;
          sd6 = *sp++;
          sd7 = *sp++;
          CHANNELEXTRACT_U8_41ML(sd4, sd5, sd6, sd7, dd1);
          *dp++ = vis_faligndata(dd0, dd1);
        }
      }

      /* end point handling */
      if ((mlib_addr) dp <= (mlib_addr) dend) {
        emask = vis_edge8(dp, dend);
        dd0 = dd1;
        sd4 = *sp++;
        sd5 = *sp++;
        sd6 = *sp++;
        sd7 = *sp++;
        CHANNELEXTRACT_U8_41ML(sd4, sd5, sd6, sd7, dd1);
        vis_pst_8(vis_faligndata(dd0, dd1), dp++, emask);
      }
    }
  }
  else if (((cmask == 8) && (soff % 4 == 2)) ||
           ((cmask == 4) && (soff % 4 == 1)) ||
           ((cmask == 2) && (soff % 4 == 0)) ||
           ((cmask == 1) && (soff % 4 == 3))) { /* extract middle right channel */

    if (off == 0) {                         /* src and dst have same alignment */

      /* generate edge mask for the start point */
      emask = vis_edge8(da, dend);

      /* load 16 bytes */
      sd0 = *sp++;
      sd1 = *sp++;
      sd2 = *sp++;
      sd3 = *sp++;

      /* extract, including some garbage at the start point */
      CHANNELEXTRACT_U8_41MR(sd0, sd1, sd2, sd3, dd0);

      /* store 8 bytes result */
      vis_pst_8(dd0, dp++, emask);

      if ((mlib_addr) dp <= (mlib_addr) dend2) {
        n = ((mlib_u8 *) dend2 - (mlib_u8 *) dp) / 8 + 1;

        /* 8-pixel column loop, emask not needed */
#pragma pipeloop(0)
        for (i = 0; i < n; i++) {
          sd0 = *sp++;
          sd1 = *sp++;
          sd2 = *sp++;
          sd3 = *sp++;
          CHANNELEXTRACT_U8_41MR(sd0, sd1, sd2, sd3, dd0);
          *dp++ = dd0;
        }
      }

      /* end point handling */
      if ((mlib_addr) dp <= (mlib_addr) dend) {
        emask = vis_edge8(dp, dend);
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        sd3 = *sp++;
        CHANNELEXTRACT_U8_41MR(sd0, sd1, sd2, sd3, dd0);
        vis_pst_8(dd0, dp++, emask);
      }
    }
    else {
      vis_alignaddr((void *)0, off);

      /* generate edge mask for the start point */
      emask = vis_edge8(da, dend);

      if (off < 0) {
        /* load 24 bytes */
        sd4 = *sp++;
        sd5 = *sp++;
        sd6 = *sp++;
        sd7 = *sp++;

        /* extract and store 8 bytes */
        CHANNELEXTRACT_U8_41MR(sd4, sd5, sd6, sd7, dd1);
        vis_pst_8(vis_faligndata(dd1, dd1), dp++, emask);
      }
      else {
        /* load 48 bytes */
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        sd3 = *sp++;
        sd4 = *sp++;
        sd5 = *sp++;
        sd6 = *sp++;
        sd7 = *sp++;

        /* extract and store 8 bytes */
        CHANNELEXTRACT_U8_41MR(sd0, sd1, sd2, sd3, dd0);
        CHANNELEXTRACT_U8_41MR(sd4, sd5, sd6, sd7, dd1);
        vis_pst_8(vis_faligndata(dd0, dd1), dp++, emask);
      }

      if ((mlib_addr) dp <= (mlib_addr) dend2) {
        n = ((mlib_u8 *) dend2 - (mlib_u8 *) dp) / 8 + 1;

        /* 8-pixel column loop, emask not needed */
#pragma pipeloop(0)
        for (i = 0; i < n; i++) {
          dd0 = dd1;
          sd4 = *sp++;
          sd5 = *sp++;
          sd6 = *sp++;
          sd7 = *sp++;
          CHANNELEXTRACT_U8_41MR(sd4, sd5, sd6, sd7, dd1);
          *dp++ = vis_faligndata(dd0, dd1);
        }
      }

      /* end point handling */
      if ((mlib_addr) dp <= (mlib_addr) dend) {
        emask = vis_edge8(dp, dend);
        dd0 = dd1;
        sd4 = *sp++;
        sd5 = *sp++;
        sd6 = *sp++;
        sd7 = *sp++;
        CHANNELEXTRACT_U8_41MR(sd4, sd5, sd6, sd7, dd1);
        vis_pst_8(vis_faligndata(dd0, dd1), dp++, emask);
      }
    }
  }
  else {                                    /* extract right channel */
    if (off == 0) {                         /* src and dst have same alignment */

      /* generate edge mask for the start point */
      emask = vis_edge8(da, dend);

      /* load 16 bytes */
      sd0 = *sp++;
      sd1 = *sp++;
      sd2 = *sp++;
      sd3 = *sp++;

      /* extract, including some garbage at the start point */
      CHANNELEXTRACT_U8_41R(sd0, sd1, sd2, sd3, dd0);

      /* store 8 bytes result */
      vis_pst_8(dd0, dp++, emask);

      if ((mlib_addr) dp <= (mlib_addr) dend2) {
        n = ((mlib_u8 *) dend2 - (mlib_u8 *) dp) / 8 + 1;

        /* 8-pixel column loop, emask not needed */
#pragma pipeloop(0)
        for (i = 0; i < n; i++) {
          sd0 = *sp++;
          sd1 = *sp++;
          sd2 = *sp++;
          sd3 = *sp++;
          CHANNELEXTRACT_U8_41R(sd0, sd1, sd2, sd3, dd0);
          *dp++ = dd0;
        }
      }

      /* end point handling */
      if ((mlib_addr) dp <= (mlib_addr) dend) {
        emask = vis_edge8(dp, dend);
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        sd3 = *sp++;
        CHANNELEXTRACT_U8_41R(sd0, sd1, sd2, sd3, dd0);
        vis_pst_8(dd0, dp++, emask);
      }
    }
    else {
      vis_alignaddr((void *)0, off);

      /* generate edge mask for the start point */
      emask = vis_edge8(da, dend);

      if (off < 0) {
        /* load 24 bytes */
        sd4 = *sp++;
        sd5 = *sp++;
        sd6 = *sp++;
        sd7 = *sp++;

        /* extract and store 8 bytes */
        CHANNELEXTRACT_U8_41R(sd4, sd5, sd6, sd7, dd1);
        vis_pst_8(vis_faligndata(dd1, dd1), dp++, emask);
      }
      else {
        /* load 48 bytes */
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        sd3 = *sp++;
        sd4 = *sp++;
        sd5 = *sp++;
        sd6 = *sp++;
        sd7 = *sp++;

        /* extract and store 8 bytes */
        CHANNELEXTRACT_U8_41R(sd0, sd1, sd2, sd3, dd0);
        CHANNELEXTRACT_U8_41R(sd4, sd5, sd6, sd7, dd1);
        vis_pst_8(vis_faligndata(dd0, dd1), dp++, emask);
      }

      if ((mlib_addr) dp <= (mlib_addr) dend2) {
        n = ((mlib_u8 *) dend2 - (mlib_u8 *) dp) / 8 + 1;

        /* 8-pixel column loop, emask not needed */
#pragma pipeloop(0)
        for (i = 0; i < n; i++) {
          dd0 = dd1;
          sd4 = *sp++;
          sd5 = *sp++;
          sd6 = *sp++;
          sd7 = *sp++;
          CHANNELEXTRACT_U8_41R(sd4, sd5, sd6, sd7, dd1);
          *dp++ = vis_faligndata(dd0, dd1);
        }
      }

      /* end point handling */
      if ((mlib_addr) dp <= (mlib_addr) dend) {
        emask = vis_edge8(dp, dend);
        dd0 = dd1;
        sd4 = *sp++;
        sd5 = *sp++;
        sd6 = *sp++;
        sd7 = *sp++;
        CHANNELEXTRACT_U8_41R(sd4, sd5, sd6, sd7, dd1);
        vis_pst_8(vis_faligndata(dd0, dd1), dp++, emask);
      }
    }
  }
}

/***************************************************************/
void mlib_v_ImageChannelExtract_U8_41(const mlib_u8 *src,
                                      mlib_s32      slb,
                                      mlib_u8       *dst,
                                      mlib_s32      dlb,
                                      mlib_s32      xsize,
                                      mlib_s32      ysize,
                                      mlib_s32      cmask)
{
  mlib_u8 *sa, *da;
  mlib_u8 *sl, *dl;
  mlib_s32 j;

  sa = sl = (void *)src;
  da = dl = dst;

  for (j = 0; j < ysize; j++) {
    mlib_v_ImageChannelExtract_U8_41_D1(sa, da, xsize, cmask);
    sa = sl += slb;
    da = dl += dlb;
  }
}

/***************************************************************/
#define CHANNELEXTRACT_S16_21L(sd0, sd1, dd)                    \
  sda = vis_fpmerge(vis_read_hi(sd0), vis_read_hi(sd1));        \
  sdb = vis_fpmerge(vis_read_lo(sd0), vis_read_lo(sd1));        \
  sdc = vis_fpmerge(vis_read_hi(sda), vis_read_hi(sdb));        \
  dd  = vis_fpmerge(vis_read_hi(sdc), vis_read_lo(sdc))

/***************************************************************/
#define CHANNELEXTRACT_S16_21R(sd0, sd1, dd)                    \
  sda = vis_fpmerge(vis_read_hi(sd0), vis_read_hi(sd1));        \
  sdb = vis_fpmerge(vis_read_lo(sd0), vis_read_lo(sd1));        \
  sdc = vis_fpmerge(vis_read_lo(sda), vis_read_lo(sdb));        \
  dd  = vis_fpmerge(vis_read_hi(sdc), vis_read_lo(sdc))

/***************************************************************/
/* extract one channel from a 2-channel image.
 * both source and destination image data are 8-byte aligned.
 * dsize is multiple of 4.
 */

void mlib_v_ImageChannelExtract_S16_21_A8D1X4(const mlib_s16 *src,
                                              mlib_s16       *dst,
                                              mlib_s32       dsize,
                                              mlib_s32       cmask)
{
  mlib_d64 *sp, *dp;
  mlib_d64 sd0, sd1;
  mlib_d64 sda, sdb, sdc;
  mlib_d64 dd;
  mlib_s32 i;

  sp = (mlib_d64 *) src;
  dp = (mlib_d64 *) dst;

  if (cmask == 2) {
#pragma pipeloop(0)
    for (i = 0; i < dsize / 4; i++) {
      sd0 = *sp++;
      sd1 = *sp++;
      CHANNELEXTRACT_S16_21L(sd0, sd1, dd);
      *dp++ = dd;
    }
  }
  else {
#pragma pipeloop(0)
    for (i = 0; i < dsize / 4; i++) {
      sd0 = *sp++;
      sd1 = *sp++;
      CHANNELEXTRACT_S16_21R(sd0, sd1, dd);
      *dp++ = dd;
    }
  }
}

/***************************************************************/
void mlib_v_ImageChannelExtract_S16_21_A8D2X4(const mlib_s16 *src,
                                              mlib_s32       slb,
                                              mlib_s16       *dst,
                                              mlib_s32       dlb,
                                              mlib_s32       xsize,
                                              mlib_s32       ysize,
                                              mlib_s32       cmask)
{
  mlib_d64 *sp, *dp;
  mlib_d64 *sl, *dl;
  mlib_d64 sd0, sd1;
  mlib_d64 sda, sdb, sdc;
  mlib_d64 dd;
  mlib_s32 i, j;

  sp = sl = (mlib_d64 *) src;
  dp = dl = (mlib_d64 *) dst;

  if (cmask == 2) {
    for (j = 0; j < ysize; j++) {
#pragma pipeloop(0)
      for (i = 0; i < xsize / 4; i++) {
        sd0 = *sp++;
        sd1 = *sp++;
        CHANNELEXTRACT_S16_21L(sd0, sd1, dd);
        *dp++ = dd;
      }

      sp = sl = (mlib_d64 *) ((mlib_u8 *) sl + slb);
      dp = dl = (mlib_d64 *) ((mlib_u8 *) dl + dlb);
    }
  }
  else {
    for (j = 0; j < ysize; j++) {
#pragma pipeloop(0)
      for (i = 0; i < xsize / 4; i++) {
        sd0 = *sp++;
        sd1 = *sp++;
        CHANNELEXTRACT_S16_21R(sd0, sd1, dd);
        *dp++ = dd;
      }

      sp = sl = (mlib_d64 *) ((mlib_u8 *) sl + slb);
      dp = dl = (mlib_d64 *) ((mlib_u8 *) dl + dlb);
    }
  }
}

/***************************************************************/
void mlib_v_ImageChannelExtract_S16_21_D1(const mlib_s16 *src,
                                          mlib_s16       *dst,
                                          mlib_s32       dsize,
                                          mlib_s32       cmask)
{
  mlib_s16 *sa, *da;
  mlib_s16 *dend, *dend2;                             /* end points in dst */
  mlib_d64 *dp;                                       /* 8-byte aligned start points in dst */
  mlib_d64 *sp;                                       /* 8-byte aligned start point in src */
  mlib_d64 sd0, sd1, sd2, sd3;                        /* 8-byte source data */
  mlib_d64 sda, sdb, sdc;
  mlib_d64 dd0, dd1;
  mlib_s32 soff;                                      /* offset of address in src */
  mlib_s32 doff;                                      /* offset of address in dst */
  mlib_s32 off;                                       /* offset of dst over src */
  mlib_s32 emask;                                     /* edge mask */
  mlib_s32 i, n;

  sa = (void *)src;
  da = dst;

  /* prepare the source address */
  sp = (mlib_d64 *) ((mlib_addr) sa & (~7));
  soff = ((mlib_addr) sa & 7);

  /* prepare the destination addresses */
  dp = (mlib_d64 *) ((mlib_addr) da & (~7));
  doff = ((mlib_addr) da & 7);
  dend = da + dsize - 1;
  dend2 = dend - 3;

  /* calculate the src's offset over dst */
  if (cmask == 2) {
    off = (soff / 4) * 2 - doff;
  }
  else {
    off = ((soff + 3) / 4) * 2 - doff;
  }

  if (((cmask == 2) && (soff % 4 == 0)) || ((cmask == 1) && (soff % 4 != 0))) { /* extract even words */

    if (off == 0) {                         /* src and dst have same alignment */

      /* generate edge mask for the start point */
      emask = vis_edge16(da, dend);

      /* load 16 bytes */
      sd0 = *sp++;
      sd1 = *sp++;

      /* extract, including some garbage at the start point */
      CHANNELEXTRACT_S16_21L(sd0, sd1, dd0);

      /* store 8 bytes result */
      vis_pst_16(dd0, dp++, emask);

      if ((mlib_addr) dp <= (mlib_addr) dend2) {
        n = ((mlib_u8 *) dend2 - (mlib_u8 *) dp) / 8 + 1;

        /* 8-pixel column loop, emask not needed */
#pragma pipeloop(0)
        for (i = 0; i < n; i++) {
          sd0 = *sp++;
          sd1 = *sp++;
          CHANNELEXTRACT_S16_21L(sd0, sd1, dd0);
          *dp++ = dd0;
        }
      }

      /* end point handling */
      if ((mlib_addr) dp <= (mlib_addr) dend) {
        emask = vis_edge16(dp, dend);
        sd0 = *sp++;
        sd1 = *sp++;
        CHANNELEXTRACT_S16_21L(sd0, sd1, dd0);
        vis_pst_16(dd0, dp++, emask);
      }
    }
    else {
      vis_alignaddr((void *)0, off);

      /* generate edge mask for the start point */
      emask = vis_edge16(da, dend);

      if (off < 0) {
        /* load 16 bytes */
        sd2 = *sp++;
        sd3 = *sp++;

        /* extract and store 8 bytes */
        CHANNELEXTRACT_S16_21L(sd2, sd3, dd1);
        vis_pst_16(vis_faligndata(dd1, dd1), dp++, emask);
      }
      else {
        /* load 32 bytes */
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        sd3 = *sp++;

        /* extract and store 8 bytes */
        CHANNELEXTRACT_S16_21L(sd0, sd1, dd0);
        CHANNELEXTRACT_S16_21L(sd2, sd3, dd1);
        vis_pst_16(vis_faligndata(dd0, dd1), dp++, emask);
      }

      if ((mlib_addr) dp <= (mlib_addr) dend2) {
        n = ((mlib_u8 *) dend2 - (mlib_u8 *) dp) / 8 + 1;

        /* 8-pixel column loop, emask not needed */
#pragma pipeloop(0)
        for (i = 0; i < n; i++) {
          dd0 = dd1;
          sd2 = *sp++;
          sd3 = *sp++;
          CHANNELEXTRACT_S16_21L(sd2, sd3, dd1);
          *dp++ = vis_faligndata(dd0, dd1);
        }
      }

      /* end point handling */
      if ((mlib_addr) dp <= (mlib_addr) dend) {
        emask = vis_edge16(dp, dend);
        dd0 = dd1;
        sd2 = *sp++;
        sd3 = *sp++;
        CHANNELEXTRACT_S16_21L(sd2, sd3, dd1);
        vis_pst_16(vis_faligndata(dd0, dd1), dp++, emask);
      }
    }
  }
  else {                                    /* extract odd words */

    if (off == 0) {                         /* src and dst have same alignment */

      /* generate edge mask for the start point */
      emask = vis_edge16(da, dend);

      /* load 16 bytes, don't care the garbage at the start point */
      sd0 = *sp++;
      sd1 = *sp++;

      /* extract and store 8 bytes */
      CHANNELEXTRACT_S16_21R(sd0, sd1, dd0);
      vis_pst_16(dd0, dp++, emask);

      if ((mlib_addr) dp <= (mlib_addr) dend2) {
        n = ((mlib_u8 *) dend2 - (mlib_u8 *) dp) / 8 + 1;

        /* 8-pixel column loop, emask not needed */
#pragma pipeloop(0)
        for (i = 0; i < n; i++) {
          sd0 = *sp++;
          sd1 = *sp++;
          CHANNELEXTRACT_S16_21R(sd0, sd1, dd0);
          *dp++ = dd0;
        }
      }

      /* end point handling */
      if ((mlib_addr) dp <= (mlib_addr) dend) {
        emask = vis_edge16(dp, dend);
        sd0 = *sp++;
        sd1 = *sp++;
        CHANNELEXTRACT_S16_21R(sd0, sd1, dd0);
        vis_pst_16(dd0, dp++, emask);
      }
    }
    else {
      vis_alignaddr((void *)0, off);

      /* generate edge mask for the start point */
      emask = vis_edge16(da, dend);

      if (off < 0) {
        /* load 16 bytes */
        sd2 = *sp++;
        sd3 = *sp++;

        /* extract and store 8 bytes */
        CHANNELEXTRACT_S16_21R(sd2, sd3, dd1);
        vis_pst_16(vis_faligndata(dd1, dd1), dp++, emask);
      }
      else {
        /* load 32 bytes */
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        sd3 = *sp++;

        /* extract and store 8 bytes */
        CHANNELEXTRACT_S16_21R(sd0, sd1, dd0);
        CHANNELEXTRACT_S16_21R(sd2, sd3, dd1);
        vis_pst_16(vis_faligndata(dd0, dd1), dp++, emask);
      }

      if ((mlib_addr) dp <= (mlib_addr) dend2) {
        n = ((mlib_u8 *) dend2 - (mlib_u8 *) dp) / 8 + 1;

        /* 8-pixel column loop, emask not needed */
#pragma pipeloop(0)
        for (i = 0; i < n; i++) {
          dd0 = dd1;
          sd2 = *sp++;
          sd3 = *sp++;
          CHANNELEXTRACT_S16_21R(sd2, sd3, dd1);
          *dp++ = vis_faligndata(dd0, dd1);
        }
      }

      /* end point handling */
      if ((mlib_addr) dp <= (mlib_addr) dend) {
        emask = vis_edge16(dp, dend);
        dd0 = dd1;
        sd2 = *sp++;
        sd3 = *sp++;
        CHANNELEXTRACT_S16_21R(sd2, sd3, dd1);
        vis_pst_16(vis_faligndata(dd0, dd1), dp++, emask);
      }
    }
  }
}

/***************************************************************/
void mlib_v_ImageChannelExtract_S16_21(const mlib_s16 *src,
                                       mlib_s32       slb,
                                       mlib_s16       *dst,
                                       mlib_s32       dlb,
                                       mlib_s32       xsize,
                                       mlib_s32       ysize,
                                       mlib_s32       cmask)
{
  mlib_s16 *sa, *da;
  mlib_s16 *sl, *dl;
  mlib_s32 j;

  sa = sl = (void *)src;
  da = dl = dst;

  for (j = 0; j < ysize; j++) {
    mlib_v_ImageChannelExtract_S16_21_D1(sa, da, xsize, cmask);
    sa = sl = (mlib_s16 *) ((mlib_u8 *) sl + slb);
    da = dl = (mlib_s16 *) ((mlib_u8 *) dl + dlb);
  }
}

/***************************************************************/
#define CHANNELEXTRACT_S16_31L(sd0, sd1, sd2, dd)               \
  /* extract the left channel */                                \
  sda = vis_fpmerge(vis_read_hi(sd0), vis_read_lo(sd1));        \
  sdb = vis_fpmerge(vis_read_lo(sd0), vis_read_hi(sd2));        \
  sdc = vis_fpmerge(vis_read_hi(sda), vis_read_lo(sdb));        \
  dd  = vis_fpmerge(vis_read_hi(sdc), vis_read_lo(sdc))

/***************************************************************/
#define CHANNELEXTRACT_S16_31M(sd0, sd1, sd2, dd)               \
  /* extract the middle channel */                              \
  sda = vis_fpmerge(vis_read_hi(sd0), vis_read_lo(sd1));        \
  sdb = vis_fpmerge(vis_read_hi(sd1), vis_read_lo(sd2));        \
  sdc = vis_fpmerge(vis_read_lo(sda), vis_read_hi(sdb));        \
  dd  = vis_fpmerge(vis_read_hi(sdc), vis_read_lo(sdc))

/***************************************************************/
#define CHANNELEXTRACT_S16_31R(sd0, sd1, sd2, dd)               \
  /* extract the right channel */                               \
  sda = vis_fpmerge(vis_read_lo(sd0), vis_read_hi(sd2));        \
  sdb = vis_fpmerge(vis_read_hi(sd1), vis_read_lo(sd2));        \
  sdc = vis_fpmerge(vis_read_hi(sda), vis_read_lo(sdb));        \
  dd  = vis_fpmerge(vis_read_hi(sdc), vis_read_lo(sdc))

/***************************************************************/
void mlib_v_ImageChannelExtract_S16_31_A8D1X4(const mlib_s16 *src,
                                              mlib_s16       *dst,
                                              mlib_s32       dsize,
                                              mlib_s32       cmask)
{
  mlib_d64 *sp, *dp;
  mlib_d64 sd0, sd1, sd2;
  mlib_d64 sda, sdb, sdc;
  mlib_d64 dd;
  mlib_s32 i;

  sp = (mlib_d64 *) src;
  dp = (mlib_d64 *) dst;

  if (cmask == 4) {
#pragma pipeloop(0)
    for (i = 0; i < dsize / 4; i++) {
      sd0 = *sp++;
      sd1 = *sp++;
      sd2 = *sp++;
      CHANNELEXTRACT_S16_31L(sd0, sd1, sd2, dd);
      *dp++ = dd;
    }
  }
  else if (cmask == 2) {
#pragma pipeloop(0)
    for (i = 0; i < dsize / 4; i++) {
      sd0 = *sp++;
      sd1 = *sp++;
      sd2 = *sp++;
      CHANNELEXTRACT_S16_31M(sd0, sd1, sd2, dd);
      *dp++ = dd;
    }
  }
  else {
#pragma pipeloop(0)
    for (i = 0; i < dsize / 4; i++) {
      sd0 = *sp++;
      sd1 = *sp++;
      sd2 = *sp++;
      CHANNELEXTRACT_S16_31R(sd0, sd1, sd2, dd);
      *dp++ = dd;
    }
  }
}

/***************************************************************/
void mlib_v_ImageChannelExtract_S16_31_A8D2X4(const mlib_s16 *src,
                                              mlib_s32       slb,
                                              mlib_s16       *dst,
                                              mlib_s32       dlb,
                                              mlib_s32       xsize,
                                              mlib_s32       ysize,
                                              mlib_s32       cmask)
{
  mlib_d64 *sp, *dp;
  mlib_d64 *sl, *dl;
  mlib_d64 sd0, sd1, sd2;
  mlib_d64 sda, sdb, sdc;
  mlib_d64 dd;
  mlib_s32 i, j;

  sp = sl = (mlib_d64 *) src;
  dp = dl = (mlib_d64 *) dst;

  if (cmask == 4) {
    for (j = 0; j < ysize; j++) {
#pragma pipeloop(0)
      for (i = 0; i < xsize / 4; i++) {
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        CHANNELEXTRACT_S16_31L(sd0, sd1, sd2, dd);
        *dp++ = dd;
      }

      sp = sl = (mlib_d64 *) ((mlib_u8 *) sl + slb);
      dp = dl = (mlib_d64 *) ((mlib_u8 *) dl + dlb);
    }
  }
  else if (cmask == 2) {
    for (j = 0; j < ysize; j++) {
#pragma pipeloop(0)
      for (i = 0; i < xsize / 4; i++) {
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        CHANNELEXTRACT_S16_31M(sd0, sd1, sd2, dd);
        *dp++ = dd;
      }

      sp = sl = (mlib_d64 *) ((mlib_u8 *) sl + slb);
      dp = dl = (mlib_d64 *) ((mlib_u8 *) dl + dlb);
    }
  }
  else {
    for (j = 0; j < ysize; j++) {
#pragma pipeloop(0)
      for (i = 0; i < xsize / 4; i++) {
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        CHANNELEXTRACT_S16_31R(sd0, sd1, sd2, dd);
        *dp++ = dd;
      }

      sp = sl = (mlib_d64 *) ((mlib_u8 *) sl + slb);
      dp = dl = (mlib_d64 *) ((mlib_u8 *) dl + dlb);
    }
  }
}

/***************************************************************/
void mlib_v_ImageChannelExtract_S16_31_D1(const mlib_s16 *src,
                                          mlib_s16       *dst,
                                          mlib_s32       dsize,
                                          mlib_s32       cmask)
{
  mlib_s16 *sa, *da;
  mlib_s16 *dend, *dend2;                             /* end points in dst */
  mlib_d64 *dp;                                       /* 8-byte aligned start points in dst */
  mlib_d64 *sp;                                       /* 8-byte aligned start point in src */
  mlib_d64 sd0, sd1, sd2;                             /* 8-byte source data */
  mlib_d64 sd3, sd4, sd5;
  mlib_d64 sda, sdb, sdc;
  mlib_d64 dd0, dd1;
  mlib_s32 soff;                                      /* offset of address in src */
  mlib_s32 doff;                                      /* offset of address in dst */
  mlib_s32 off;                                       /* offset of src over dst */
  mlib_s32 emask;                                     /* edge mask */
  mlib_s32 i, n;

  sa = (void *)src;
  da = dst;

  /* prepare the source address */
  sp = (mlib_d64 *) ((mlib_addr) sa & (~7));
  soff = ((mlib_addr) sa & 7);

  /* prepare the destination addresses */
  dp = (mlib_d64 *) ((mlib_addr) da & (~7));
  doff = ((mlib_addr) da & 7);
  dend = da + dsize - 1;
  dend2 = dend - 3;

  /* calculate the src's offset over dst */
  if (cmask == 4) {
    off = (soff / 6) * 2 - doff;
  }
  else if (cmask == 2) {
    off = ((soff + 2) / 6) * 2 - doff;
  }
  else {
    off = ((soff + 4) / 6) * 2 - doff;
  }

  if (((cmask == 4) && (soff % 6 == 0)) ||
      ((cmask == 2) && (soff % 6 == 4)) ||
      ((cmask == 1) && (soff % 6 == 2))) { /* extract left channel */

    if (off == 0) {                         /* src and dst have same alignment */

      /* generate edge mask for the start point */
      emask = vis_edge16(da, dend);

      /* load 16 bytes */
      sd0 = *sp++;
      sd1 = *sp++;
      sd2 = *sp++;

      /* extract, including some garbage at the start point */
      CHANNELEXTRACT_S16_31L(sd0, sd1, sd2, dd0);

      /* store 8 bytes result */
      vis_pst_16(dd0, dp++, emask);

      if ((mlib_addr) dp <= (mlib_addr) dend2) {
        n = ((mlib_u8 *) dend2 - (mlib_u8 *) dp) / 8 + 1;

        /* 8-pixel column loop, emask not needed */
#pragma pipeloop(0)
        for (i = 0; i < n; i++) {
          sd0 = *sp++;
          sd1 = *sp++;
          sd2 = *sp++;
          CHANNELEXTRACT_S16_31L(sd0, sd1, sd2, dd0);
          *dp++ = dd0;
        }
      }

      /* end point handling */
      if ((mlib_addr) dp <= (mlib_addr) dend) {
        emask = vis_edge16(dp, dend);
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        CHANNELEXTRACT_S16_31L(sd0, sd1, sd2, dd0);
        vis_pst_16(dd0, dp++, emask);
      }
    }
    else {
      vis_alignaddr((void *)0, off);

      /* generate edge mask for the start point */
      emask = vis_edge16(da, dend);

      if (off < 0) {
        /* load 24 bytes */
        sd3 = *sp++;
        sd4 = *sp++;
        sd5 = *sp++;

        /* extract and store 8 bytes */
        CHANNELEXTRACT_S16_31L(sd3, sd4, sd5, dd1);
        vis_pst_16(vis_faligndata(dd1, dd1), dp++, emask);
      }
      else {
        /* load 48 bytes */
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        sd3 = *sp++;
        sd4 = *sp++;
        sd5 = *sp++;

        /* extract and store 8 bytes */
        CHANNELEXTRACT_S16_31L(sd0, sd1, sd2, dd0);
        CHANNELEXTRACT_S16_31L(sd3, sd4, sd5, dd1);
        vis_pst_16(vis_faligndata(dd0, dd1), dp++, emask);
      }

      if ((mlib_addr) dp <= (mlib_addr) dend2) {
        n = ((mlib_u8 *) dend2 - (mlib_u8 *) dp) / 8 + 1;

        /* 8-pixel column loop, emask not needed */
#pragma pipeloop(0)
        for (i = 0; i < n; i++) {
          dd0 = dd1;
          sd3 = *sp++;
          sd4 = *sp++;
          sd5 = *sp++;
          CHANNELEXTRACT_S16_31L(sd3, sd4, sd5, dd1);
          *dp++ = vis_faligndata(dd0, dd1);
        }
      }

      /* end point handling */
      if ((mlib_addr) dp <= (mlib_addr) dend) {
        emask = vis_edge16(dp, dend);
        dd0 = dd1;
        sd3 = *sp++;
        sd4 = *sp++;
        sd5 = *sp++;
        CHANNELEXTRACT_S16_31L(sd3, sd4, sd5, dd1);
        vis_pst_16(vis_faligndata(dd0, dd1), dp++, emask);
      }
    }
  }
  else if (((cmask == 4) && (soff % 6 == 2)) ||
           ((cmask == 2) && (soff % 6 == 0)) ||
           ((cmask == 1) && (soff % 6 == 4))) {
    /* extract middle channel */

    if (off == 0) {                         /* src and dst have same alignment */

      /* generate edge mask for the start point */
      emask = vis_edge16(da, dend);

      /* load 16 bytes */
      sd0 = *sp++;
      sd1 = *sp++;
      sd2 = *sp++;

      /* extract, including some garbage at the start point */
      CHANNELEXTRACT_S16_31M(sd0, sd1, sd2, dd0);

      /* store 8 bytes result */
      vis_pst_16(dd0, dp++, emask);

      if ((mlib_addr) dp <= (mlib_addr) dend2) {
        n = ((mlib_u8 *) dend2 - (mlib_u8 *) dp) / 8 + 1;

        /* 8-pixel column loop, emask not needed */
#pragma pipeloop(0)
        for (i = 0; i < n; i++) {
          sd0 = *sp++;
          sd1 = *sp++;
          sd2 = *sp++;
          CHANNELEXTRACT_S16_31M(sd0, sd1, sd2, dd0);
          *dp++ = dd0;
        }
      }

      /* end point handling */
      if ((mlib_addr) dp <= (mlib_addr) dend) {
        emask = vis_edge16(dp, dend);
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        CHANNELEXTRACT_S16_31M(sd0, sd1, sd2, dd0);
        vis_pst_16(dd0, dp++, emask);
      }
    }
    else {
      vis_alignaddr((void *)0, off);

      /* generate edge mask for the start point */
      emask = vis_edge16(da, dend);

      if (off < 0) {
        /* load 24 bytes */
        sd3 = *sp++;
        sd4 = *sp++;
        sd5 = *sp++;

        /* extract and store 8 bytes */
        CHANNELEXTRACT_S16_31M(sd3, sd4, sd5, dd1);
        vis_pst_16(vis_faligndata(dd1, dd1), dp++, emask);
      }
      else {
        /* load 48 bytes */
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        sd3 = *sp++;
        sd4 = *sp++;
        sd5 = *sp++;

        /* extract and store 8 bytes */
        CHANNELEXTRACT_S16_31M(sd0, sd1, sd2, dd0);
        CHANNELEXTRACT_S16_31M(sd3, sd4, sd5, dd1);
        vis_pst_16(vis_faligndata(dd0, dd1), dp++, emask);
      }

      if ((mlib_addr) dp <= (mlib_addr) dend2) {
        n = ((mlib_u8 *) dend2 - (mlib_u8 *) dp) / 8 + 1;

        /* 8-pixel column loop, emask not needed */
#pragma pipeloop(0)
        for (i = 0; i < n; i++) {
          dd0 = dd1;
          sd3 = *sp++;
          sd4 = *sp++;
          sd5 = *sp++;
          CHANNELEXTRACT_S16_31M(sd3, sd4, sd5, dd1);
          *dp++ = vis_faligndata(dd0, dd1);
        }
      }

      /* end point handling */
      if ((mlib_addr) dp <= (mlib_addr) dend) {
        emask = vis_edge16(dp, dend);
        dd0 = dd1;
        sd3 = *sp++;
        sd4 = *sp++;
        sd5 = *sp++;
        CHANNELEXTRACT_S16_31M(sd3, sd4, sd5, dd1);
        vis_pst_16(vis_faligndata(dd0, dd1), dp++, emask);
      }
    }
  }
  else {                                    /* extract right channel */

    if (off == 0) {                         /* src and dst have same alignment */

      /* generate edge mask for the start point */
      emask = vis_edge16(da, dend);

      /* load 16 bytes */
      sd0 = *sp++;
      sd1 = *sp++;
      sd2 = *sp++;

      /* extract, including some garbage at the start point */
      CHANNELEXTRACT_S16_31R(sd0, sd1, sd2, dd0);

      /* store 8 bytes result */
      vis_pst_16(dd0, dp++, emask);

      if ((mlib_addr) dp <= (mlib_addr) dend2) {
        n = ((mlib_u8 *) dend2 - (mlib_u8 *) dp) / 8 + 1;

        /* 8-pixel column loop, emask not needed */
#pragma pipeloop(0)
        for (i = 0; i < n; i++) {
          sd0 = *sp++;
          sd1 = *sp++;
          sd2 = *sp++;
          CHANNELEXTRACT_S16_31R(sd0, sd1, sd2, dd0);
          *dp++ = dd0;
        }
      }

      /* end point handling */
      if ((mlib_addr) dp <= (mlib_addr) dend) {
        emask = vis_edge16(dp, dend);
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        CHANNELEXTRACT_S16_31R(sd0, sd1, sd2, dd0);
        vis_pst_16(dd0, dp++, emask);
      }
    }
    else {
      vis_alignaddr((void *)0, off);

      /* generate edge mask for the start point */
      emask = vis_edge16(da, dend);

      if (off < 0) {
        /* load 24 bytes */
        sd3 = *sp++;
        sd4 = *sp++;
        sd5 = *sp++;

        /* extract and store 8 bytes */
        CHANNELEXTRACT_S16_31R(sd3, sd4, sd5, dd1);
        vis_pst_16(vis_faligndata(dd1, dd1), dp++, emask);
      }
      else {
        /* load 48 bytes */
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        sd3 = *sp++;
        sd4 = *sp++;
        sd5 = *sp++;

        /* extract and store 8 bytes */
        CHANNELEXTRACT_S16_31R(sd0, sd1, sd2, dd0);
        CHANNELEXTRACT_S16_31R(sd3, sd4, sd5, dd1);
        vis_pst_16(vis_faligndata(dd0, dd1), dp++, emask);
      }

      if ((mlib_addr) dp <= (mlib_addr) dend2) {
        n = ((mlib_u8 *) dend2 - (mlib_u8 *) dp) / 8 + 1;

        /* 8-pixel column loop, emask not needed */
#pragma pipeloop(0)
        for (i = 0; i < n; i++) {
          dd0 = dd1;
          sd3 = *sp++;
          sd4 = *sp++;
          sd5 = *sp++;
          CHANNELEXTRACT_S16_31R(sd3, sd4, sd5, dd1);
          *dp++ = vis_faligndata(dd0, dd1);
        }
      }

      /* end point handling */
      if ((mlib_addr) dp <= (mlib_addr) dend) {
        emask = vis_edge16(dp, dend);
        dd0 = dd1;
        sd3 = *sp++;
        sd4 = *sp++;
        sd5 = *sp++;
        CHANNELEXTRACT_S16_31R(sd3, sd4, sd5, dd1);
        vis_pst_16(vis_faligndata(dd0, dd1), dp++, emask);
      }
    }
  }
}

/***************************************************************/
void mlib_v_ImageChannelExtract_S16_31(const mlib_s16 *src,
                                       mlib_s32       slb,
                                       mlib_s16       *dst,
                                       mlib_s32       dlb,
                                       mlib_s32       xsize,
                                       mlib_s32       ysize,
                                       mlib_s32       cmask)
{
  mlib_s16 *sa, *da;
  mlib_s16 *sl, *dl;
  mlib_s32 j;

  sa = sl = (void *)src;
  da = dl = dst;

  for (j = 0; j < ysize; j++) {
    mlib_v_ImageChannelExtract_S16_31_D1(sa, da, xsize, cmask);
    sa = sl = (mlib_s16 *) ((mlib_u8 *) sl + slb);
    da = dl = (mlib_s16 *) ((mlib_u8 *) dl + dlb);
  }
}

/***************************************************************/
#define CHANNELEXTRACT_S16_41L(sd0, sd1,  sd2, sd3, dd)         \
  /* extract the left channel */                                \
  sda = vis_fpmerge(vis_read_hi(sd0), vis_read_hi(sd2));        \
  sdb = vis_fpmerge(vis_read_hi(sd1), vis_read_hi(sd3));        \
  sdc = vis_fpmerge(vis_read_hi(sda), vis_read_hi(sdb));        \
  dd  = vis_fpmerge(vis_read_hi(sdc), vis_read_lo(sdc))

/***************************************************************/
#define CHANNELEXTRACT_S16_41ML(sd0, sd1, sd2, sd3, dd)         \
  /* extract the middle left channel */                         \
  sda = vis_fpmerge(vis_read_hi(sd0), vis_read_hi(sd2));        \
  sdb = vis_fpmerge(vis_read_hi(sd1), vis_read_hi(sd3));        \
  sdc = vis_fpmerge(vis_read_lo(sda), vis_read_lo(sdb));        \
  dd  = vis_fpmerge(vis_read_hi(sdc), vis_read_lo(sdc))

/***************************************************************/
#define CHANNELEXTRACT_S16_41MR(sd0, sd1, sd2, sd3, dd)         \
  /* extract the middle right channel */                        \
  sda = vis_fpmerge(vis_read_lo(sd0), vis_read_lo(sd2));        \
  sdb = vis_fpmerge(vis_read_lo(sd1), vis_read_lo(sd3));        \
  sdc = vis_fpmerge(vis_read_hi(sda), vis_read_hi(sdb));        \
  dd  = vis_fpmerge(vis_read_hi(sdc), vis_read_lo(sdc))

/***************************************************************/
#define CHANNELEXTRACT_S16_41R(sd0, sd1, sd2, sd3, dd)          \
  /* extract the right channel */                               \
  sda = vis_fpmerge(vis_read_lo(sd0), vis_read_lo(sd2));        \
  sdb = vis_fpmerge(vis_read_lo(sd1), vis_read_lo(sd3));        \
  sdc = vis_fpmerge(vis_read_lo(sda), vis_read_lo(sdb));        \
  dd  = vis_fpmerge(vis_read_hi(sdc), vis_read_lo(sdc))

/***************************************************************/
void mlib_v_ImageChannelExtract_S16_41_A8D1X4(const mlib_s16 *src,
                                              mlib_s16       *dst,
                                              mlib_s32       dsize,
                                              mlib_s32       cmask)
{
  mlib_d64 *sp, *dp;
  mlib_d64 sd0, sd1, sd2, sd3;
  mlib_d64 sda, sdb, sdc;
  mlib_d64 dd;
  mlib_s32 i;

  sp = (mlib_d64 *) src;
  dp = (mlib_d64 *) dst;

  if (cmask == 8) {
#pragma pipeloop(0)
    for (i = 0; i < dsize / 4; i++) {
      sd0 = *sp++;
      sd1 = *sp++;
      sd2 = *sp++;
      sd3 = *sp++;
      CHANNELEXTRACT_S16_41L(sd0, sd1, sd2, sd3, dd);
      *dp++ = dd;
    }
  }
  else if (cmask == 4) {
#pragma pipeloop(0)
    for (i = 0; i < dsize / 4; i++) {
      sd0 = *sp++;
      sd1 = *sp++;
      sd2 = *sp++;
      sd3 = *sp++;
      CHANNELEXTRACT_S16_41ML(sd0, sd1, sd2, sd3, dd);
      *dp++ = dd;
    }
  }
  else if (cmask == 2) {
#pragma pipeloop(0)
    for (i = 0; i < dsize / 4; i++) {
      sd0 = *sp++;
      sd1 = *sp++;
      sd2 = *sp++;
      sd3 = *sp++;
      CHANNELEXTRACT_S16_41MR(sd0, sd1, sd2, sd3, dd);
      *dp++ = dd;
    }
  }
  else {
#pragma pipeloop(0)
    for (i = 0; i < dsize / 4; i++) {
      sd0 = *sp++;
      sd1 = *sp++;
      sd2 = *sp++;
      sd3 = *sp++;
      CHANNELEXTRACT_S16_41R(sd0, sd1, sd2, sd3, dd);
      *dp++ = dd;
    }
  }
}

/***************************************************************/
void mlib_v_ImageChannelExtract_S16_41_A8D2X4(const mlib_s16 *src,
                                              mlib_s32       slb,
                                              mlib_s16       *dst,
                                              mlib_s32       dlb,
                                              mlib_s32       xsize,
                                              mlib_s32       ysize,
                                              mlib_s32       cmask)
{
  mlib_d64 *sp, *dp;
  mlib_d64 *sl, *dl;
  mlib_d64 sd0, sd1, sd2, sd3;
  mlib_d64 sda, sdb, sdc;
  mlib_d64 dd;
  mlib_s32 i, j;

  sp = sl = (mlib_d64 *) src;
  dp = dl = (mlib_d64 *) dst;

  if (cmask == 8) {
    for (j = 0; j < ysize; j++) {
#pragma pipeloop(0)
      for (i = 0; i < xsize / 4; i++) {
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        sd3 = *sp++;
        CHANNELEXTRACT_S16_41L(sd0, sd1, sd2, sd3, dd);
        *dp++ = dd;
      }

      sp = sl = (mlib_d64 *) ((mlib_u8 *) sl + slb);
      dp = dl = (mlib_d64 *) ((mlib_u8 *) dl + dlb);
    }
  }
  else if (cmask == 4) {
    for (j = 0; j < ysize; j++) {
#pragma pipeloop(0)
      for (i = 0; i < xsize / 4; i++) {
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        sd3 = *sp++;
        CHANNELEXTRACT_S16_41ML(sd0, sd1, sd2, sd3, dd);
        *dp++ = dd;
      }

      sp = sl = (mlib_d64 *) ((mlib_u8 *) sl + slb);
      dp = dl = (mlib_d64 *) ((mlib_u8 *) dl + dlb);
    }
  }
  else if (cmask == 2) {
    for (j = 0; j < ysize; j++) {
#pragma pipeloop(0)
      for (i = 0; i < xsize / 4; i++) {
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        sd3 = *sp++;
        CHANNELEXTRACT_S16_41MR(sd0, sd1, sd2, sd3, dd);
        *dp++ = dd;
      }

      sp = sl = (mlib_d64 *) ((mlib_u8 *) sl + slb);
      dp = dl = (mlib_d64 *) ((mlib_u8 *) dl + dlb);
    }
  }
  else {
    for (j = 0; j < ysize; j++) {
#pragma pipeloop(0)
      for (i = 0; i < xsize / 4; i++) {
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        sd3 = *sp++;
        CHANNELEXTRACT_S16_41R(sd0, sd1, sd2, sd3, dd);
        *dp++ = dd;
      }

      sp = sl = (mlib_d64 *) ((mlib_u8 *) sl + slb);
      dp = dl = (mlib_d64 *) ((mlib_u8 *) dl + dlb);
    }
  }
}

/***************************************************************/
void mlib_v_ImageChannelExtract_S16_41_D1(const mlib_s16 *src,
                                          mlib_s16       *dst,
                                          mlib_s32       dsize,
                                          mlib_s32       cmask)
{
  mlib_s16 *sa, *da;
  mlib_s16 *dend, *dend2;                             /* end points in dst */
  mlib_d64 *dp;                                       /* 8-byte aligned start points in dst */
  mlib_d64 *sp;                                       /* 8-byte aligned start point in src */
  mlib_d64 sd0, sd1, sd2, sd3;                        /* 8-byte source data */
  mlib_d64 sd4, sd5, sd6, sd7;
  mlib_d64 sda, sdb, sdc;
  mlib_d64 dd0, dd1;
  mlib_s32 soff;                                      /* offset of address in src */
  mlib_s32 doff;                                      /* offset of address in dst */
  mlib_s32 off;                                       /* offset of src over dst */
  mlib_s32 emask;                                     /* edge mask */
  mlib_s32 i, n;

  sa = (void *)src;
  da = dst;

  /* prepare the source address */
  sp = (mlib_d64 *) ((mlib_addr) sa & (~7));
  soff = ((mlib_addr) sa & 7);

  /* prepare the destination addresses */
  dp = (mlib_d64 *) ((mlib_addr) da & (~7));
  doff = ((mlib_addr) da & 7);
  dend = da + dsize - 1;
  dend2 = dend - 3;

  /* calculate the src's offset over dst */
  if (cmask == 8) {
    off = (soff / 8) * 2 - doff;
  }
  else if (cmask == 4) {
    off = ((soff + 2) / 8) * 2 - doff;
  }
  else if (cmask == 2) {
    off = ((soff + 4) / 8) * 2 - doff;
  }
  else {
    off = ((soff + 6) / 8) * 2 - doff;
  }

  if (((cmask == 8) && (soff == 0)) ||
      ((cmask == 4) && (soff == 6)) ||
      ((cmask == 2) && (soff == 4)) ||
      ((cmask == 1) && (soff == 2))) { /* extract left channel */

    if (off == 0) {                         /* src and dst have same alignment */

      /* generate edge mask for the start point */
      emask = vis_edge16(da, dend);

      /* load 16 bytes */
      sd0 = *sp++;
      sd1 = *sp++;
      sd2 = *sp++;
      sd3 = *sp++;

      /* extract, including some garbage at the start point */
      CHANNELEXTRACT_S16_41L(sd0, sd1, sd2, sd3, dd0);

      /* store 8 bytes result */
      vis_pst_16(dd0, dp++, emask);

      if ((mlib_addr) dp <= (mlib_addr) dend2) {
        n = ((mlib_u8 *) dend2 - (mlib_u8 *) dp) / 8 + 1;

        /* 8-pixel column loop, emask not needed */
#pragma pipeloop(0)
        for (i = 0; i < n; i++) {
          sd0 = *sp++;
          sd1 = *sp++;
          sd2 = *sp++;
          sd3 = *sp++;
          CHANNELEXTRACT_S16_41L(sd0, sd1, sd2, sd3, dd0);
          *dp++ = dd0;
        }
      }

      /* end point handling */
      if ((mlib_addr) dp <= (mlib_addr) dend) {
        emask = vis_edge16(dp, dend);
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        sd3 = *sp++;
        CHANNELEXTRACT_S16_41L(sd0, sd1, sd2, sd3, dd0);
        vis_pst_16(dd0, dp++, emask);
      }
    }
    else {
      vis_alignaddr((void *)0, off);

      /* generate edge mask for the start point */
      emask = vis_edge16(da, dend);

      if (off < 0) {
        /* load 24 bytes */
        sd4 = *sp++;
        sd5 = *sp++;
        sd6 = *sp++;
        sd7 = *sp++;

        /* extract and store 8 bytes */
        CHANNELEXTRACT_S16_41L(sd4, sd5, sd6, sd7, dd1);
        vis_pst_16(vis_faligndata(dd1, dd1), dp++, emask);
      }
      else {
        /* load 48 bytes */
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        sd3 = *sp++;
        sd4 = *sp++;
        sd5 = *sp++;
        sd6 = *sp++;
        sd7 = *sp++;

        /* extract and store 8 bytes */
        CHANNELEXTRACT_S16_41L(sd0, sd1, sd2, sd3, dd0);
        CHANNELEXTRACT_S16_41L(sd4, sd5, sd6, sd7, dd1);
        vis_pst_16(vis_faligndata(dd0, dd1), dp++, emask);
      }

      if ((mlib_addr) dp <= (mlib_addr) dend2) {
        n = ((mlib_u8 *) dend2 - (mlib_u8 *) dp) / 8 + 1;

        /* 8-pixel column loop, emask not needed */
#pragma pipeloop(0)
        for (i = 0; i < n; i++) {
          dd0 = dd1;
          sd4 = *sp++;
          sd5 = *sp++;
          sd6 = *sp++;
          sd7 = *sp++;
          CHANNELEXTRACT_S16_41L(sd4, sd5, sd6, sd7, dd1);
          *dp++ = vis_faligndata(dd0, dd1);
        }
      }

      /* end point handling */
      if ((mlib_addr) dp <= (mlib_addr) dend) {
        emask = vis_edge16(dp, dend);
        dd0 = dd1;
        sd4 = *sp++;
        sd5 = *sp++;
        sd6 = *sp++;
        sd7 = *sp++;
        CHANNELEXTRACT_S16_41L(sd4, sd5, sd6, sd7, dd1);
        vis_pst_16(vis_faligndata(dd0, dd1), dp++, emask);
      }
    }
  }
  else if (((cmask == 8) && (soff == 2)) ||
           ((cmask == 4) && (soff == 0)) ||
           ((cmask == 2) && (soff == 6)) ||
           ((cmask == 1) && (soff == 4))) { /* extract middle left channel */

    if (off == 0) {                         /* src and dst have same alignment */

      /* generate edge mask for the start point */
      emask = vis_edge16(da, dend);

      /* load 16 bytes */
      sd0 = *sp++;
      sd1 = *sp++;
      sd2 = *sp++;
      sd3 = *sp++;

      /* extract, including some garbage at the start point */
      CHANNELEXTRACT_S16_41ML(sd0, sd1, sd2, sd3, dd0);

      /* store 8 bytes result */
      vis_pst_16(dd0, dp++, emask);

      if ((mlib_addr) dp <= (mlib_addr) dend2) {
        n = ((mlib_u8 *) dend2 - (mlib_u8 *) dp) / 8 + 1;

        /* 8-pixel column loop, emask not needed */
#pragma pipeloop(0)
        for (i = 0; i < n; i++) {
          sd0 = *sp++;
          sd1 = *sp++;
          sd2 = *sp++;
          sd3 = *sp++;
          CHANNELEXTRACT_S16_41ML(sd0, sd1, sd2, sd3, dd0);
          *dp++ = dd0;
        }
      }

      /* end point handling */
      if ((mlib_addr) dp <= (mlib_addr) dend) {
        emask = vis_edge16(dp, dend);
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        sd3 = *sp++;
        CHANNELEXTRACT_S16_41ML(sd0, sd1, sd2, sd3, dd0);
        vis_pst_16(dd0, dp++, emask);
      }
    }
    else {
      vis_alignaddr((void *)0, off);

      /* generate edge mask for the start point */
      emask = vis_edge16(da, dend);

      if (off < 0) {
        /* load 24 bytes */
        sd4 = *sp++;
        sd5 = *sp++;
        sd6 = *sp++;
        sd7 = *sp++;

        /* extract and store 8 bytes */
        CHANNELEXTRACT_S16_41ML(sd4, sd5, sd6, sd7, dd1);
        vis_pst_16(vis_faligndata(dd1, dd1), dp++, emask);
      }
      else {
        /* load 48 bytes */
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        sd3 = *sp++;
        sd4 = *sp++;
        sd5 = *sp++;
        sd6 = *sp++;
        sd7 = *sp++;

        /* extract and store 8 bytes */
        CHANNELEXTRACT_S16_41ML(sd0, sd1, sd2, sd3, dd0);
        CHANNELEXTRACT_S16_41ML(sd4, sd5, sd6, sd7, dd1);
        vis_pst_16(vis_faligndata(dd0, dd1), dp++, emask);
      }

      if ((mlib_addr) dp <= (mlib_addr) dend2) {
        n = ((mlib_u8 *) dend2 - (mlib_u8 *) dp) / 8 + 1;

        /* 8-pixel column loop, emask not needed */
#pragma pipeloop(0)
        for (i = 0; i < n; i++) {
          dd0 = dd1;
          sd4 = *sp++;
          sd5 = *sp++;
          sd6 = *sp++;
          sd7 = *sp++;
          CHANNELEXTRACT_S16_41ML(sd4, sd5, sd6, sd7, dd1);
          *dp++ = vis_faligndata(dd0, dd1);
        }
      }

      /* end point handling */
      if ((mlib_addr) dp <= (mlib_addr) dend) {
        emask = vis_edge16(dp, dend);
        dd0 = dd1;
        sd4 = *sp++;
        sd5 = *sp++;
        sd6 = *sp++;
        sd7 = *sp++;
        CHANNELEXTRACT_S16_41ML(sd4, sd5, sd6, sd7, dd1);
        vis_pst_16(vis_faligndata(dd0, dd1), dp++, emask);
      }
    }
  }
  else if (((cmask == 8) && (soff == 4)) ||
           ((cmask == 4) && (soff == 2)) ||
           ((cmask == 2) && (soff == 0)) ||
           ((cmask == 1) && (soff == 6))) { /* extract middle right channel */

    if (off == 0) {                         /* src and dst have same alignment */

      /* generate edge mask for the start point */
      emask = vis_edge16(da, dend);

      /* load 16 bytes */
      sd0 = *sp++;
      sd1 = *sp++;
      sd2 = *sp++;
      sd3 = *sp++;

      /* extract, including some garbage at the start point */
      CHANNELEXTRACT_S16_41MR(sd0, sd1, sd2, sd3, dd0);

      /* store 8 bytes result */
      vis_pst_16(dd0, dp++, emask);

      if ((mlib_addr) dp <= (mlib_addr) dend2) {
        n = ((mlib_u8 *) dend2 - (mlib_u8 *) dp) / 8 + 1;

        /* 8-pixel column loop, emask not needed */
#pragma pipeloop(0)
        for (i = 0; i < n; i++) {
          sd0 = *sp++;
          sd1 = *sp++;
          sd2 = *sp++;
          sd3 = *sp++;
          CHANNELEXTRACT_S16_41MR(sd0, sd1, sd2, sd3, dd0);
          *dp++ = dd0;
        }
      }

      /* end point handling */
      if ((mlib_addr) dp <= (mlib_addr) dend) {
        emask = vis_edge16(dp, dend);
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        sd3 = *sp++;
        CHANNELEXTRACT_S16_41MR(sd0, sd1, sd2, sd3, dd0);
        vis_pst_16(dd0, dp++, emask);
      }
    }
    else {
      vis_alignaddr((void *)0, off);

      /* generate edge mask for the start point */
      emask = vis_edge16(da, dend);

      if (off < 0) {
        /* load 24 bytes */
        sd4 = *sp++;
        sd5 = *sp++;
        sd6 = *sp++;
        sd7 = *sp++;

        /* extract and store 8 bytes */
        CHANNELEXTRACT_S16_41MR(sd4, sd5, sd6, sd7, dd1);
        vis_pst_16(vis_faligndata(dd1, dd1), dp++, emask);
      }
      else {
        /* load 48 bytes */
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        sd3 = *sp++;
        sd4 = *sp++;
        sd5 = *sp++;
        sd6 = *sp++;
        sd7 = *sp++;

        /* extract and store 8 bytes */
        CHANNELEXTRACT_S16_41MR(sd0, sd1, sd2, sd3, dd0);
        CHANNELEXTRACT_S16_41MR(sd4, sd5, sd6, sd7, dd1);
        vis_pst_16(vis_faligndata(dd0, dd1), dp++, emask);
      }

      if ((mlib_addr) dp <= (mlib_addr) dend2) {
        n = ((mlib_u8 *) dend2 - (mlib_u8 *) dp) / 8 + 1;

        /* 8-pixel column loop, emask not needed */
#pragma pipeloop(0)
        for (i = 0; i < n; i++) {
          dd0 = dd1;
          sd4 = *sp++;
          sd5 = *sp++;
          sd6 = *sp++;
          sd7 = *sp++;
          CHANNELEXTRACT_S16_41MR(sd4, sd5, sd6, sd7, dd1);
          *dp++ = vis_faligndata(dd0, dd1);
        }
      }

      /* end point handling */
      if ((mlib_addr) dp <= (mlib_addr) dend) {
        emask = vis_edge16(dp, dend);
        dd0 = dd1;
        sd4 = *sp++;
        sd5 = *sp++;
        sd6 = *sp++;
        sd7 = *sp++;
        CHANNELEXTRACT_S16_41MR(sd4, sd5, sd6, sd7, dd1);
        vis_pst_16(vis_faligndata(dd0, dd1), dp++, emask);
      }
    }
  }
  else {                                    /* extract right channel */
    if (off == 0) {                         /* src and dst have same alignment */

      /* generate edge mask for the start point */
      emask = vis_edge16(da, dend);

      /* load 16 bytes */
      sd0 = *sp++;
      sd1 = *sp++;
      sd2 = *sp++;
      sd3 = *sp++;

      /* extract, including some garbage at the start point */
      CHANNELEXTRACT_S16_41R(sd0, sd1, sd2, sd3, dd0);

      /* store 8 bytes result */
      vis_pst_16(dd0, dp++, emask);

      if ((mlib_addr) dp <= (mlib_addr) dend2) {
        n = ((mlib_u8 *) dend2 - (mlib_u8 *) dp) / 8 + 1;

        /* 8-pixel column loop, emask not needed */
#pragma pipeloop(0)
        for (i = 0; i < n; i++) {
          sd0 = *sp++;
          sd1 = *sp++;
          sd2 = *sp++;
          sd3 = *sp++;
          CHANNELEXTRACT_S16_41R(sd0, sd1, sd2, sd3, dd0);
          *dp++ = dd0;
        }
      }

      /* end point handling */
      if ((mlib_addr) dp <= (mlib_addr) dend) {
        emask = vis_edge16(dp, dend);
        sd0 = *sp++;
        sd1 = *sp++;
        sd2 = *sp++;
        sd3 = *sp++;
        CHANNELEXTRACT_S16_41R(sd0, sd1, sd2, sd3, dd0);
        vis_pst_16(dd0, dp++, emask);
      }
    }
    else {
      vis_alignaddr((void *)0, off);

      /* generate edge mask for the start point */
      emask = vis_edge16(da, dend);

      if (off < 0) {
        /* load 24 bytes */
        sd4 = *sp++;
        sd5 = *sp++;
        sd6 = *sp++;
        sd7 = *sp++;

        /* extract and store 8 bytes */
        CHANNELEXTRACT_S16_41R(sd4, sd5, sd6, sd7, dd1);
        vis_pst_16(vis_faligndata(dd1, dd1), dp++, emask);
      }

      if ((mlib_addr) dp <= (mlib_addr) dend2) {
        n = ((mlib_u8 *) dend2 - (mlib_u8 *) dp) / 8 + 1;

        /* 8-pixel column loop, emask not needed */
#pragma pipeloop(0)
        for (i = 0; i < n; i++) {
          dd0 = dd1;
          sd4 = *sp++;
          sd5 = *sp++;
          sd6 = *sp++;
          sd7 = *sp++;
          CHANNELEXTRACT_S16_41R(sd4, sd5, sd6, sd7, dd1);
          *dp++ = vis_faligndata(dd0, dd1);
        }
      }

      /* end point handling */
      if ((mlib_addr) dp <= (mlib_addr) dend) {
        emask = vis_edge16(dp, dend);
        dd0 = dd1;
        sd4 = *sp++;
        sd5 = *sp++;
        sd6 = *sp++;
        sd7 = *sp++;
        CHANNELEXTRACT_S16_41R(sd4, sd5, sd6, sd7, dd1);
        vis_pst_16(vis_faligndata(dd0, dd1), dp++, emask);
      }
    }
  }
}

/***************************************************************/
void mlib_v_ImageChannelExtract_S16_41(const mlib_s16 *src,
                                       mlib_s32       slb,
                                       mlib_s16       *dst,
                                       mlib_s32       dlb,
                                       mlib_s32       xsize,
                                       mlib_s32       ysize,
                                       mlib_s32       cmask)
{
  mlib_s16 *sa, *da;
  mlib_s16 *sl, *dl;
  mlib_s32 j;

  sa = sl = (void *)src;
  da = dl = dst;
  for (j = 0; j < ysize; j++) {
    mlib_v_ImageChannelExtract_S16_41_D1(sa, da, xsize, cmask);
    sa = sl = (mlib_s16 *) ((mlib_u8 *) sl + slb);
    da = dl = (mlib_s16 *) ((mlib_u8 *) dl + dlb);
  }
}

/***************************************************************/

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