/*
 * Copyright 2003 Sun Microsystems, Inc.  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.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */

/*
 * FUNCTIONS
 *      mlib_ImageConvCopyEdge_Fp  - Copy src edges  to dst edges
 *
 *
 * SYNOPSIS
 *      mlib_status mlib_ImageConvCopyEdge_Fp(mlib_image       *dst,
 *                                            const mlib_image *src,
 *                                            mlib_s32         dx_l,
 *                                            mlib_32          dx_r,
 *                                            mlib_s32         dy_t,
 *                                            mlib_32          dy_b,
 *                                            mlib_s32         cmask);
 *
 * ARGUMENT
 *      dst       Pointer to an dst image.
 *      src       Pointer to an src image.
 *      dx_l      Number of columns on the left side of the
 *                image to be copyed.
 *      dx_r      Number of columns on the right side of the
 *                image to be copyed.
 *      dy_t      Number of rows on the top edge of the
 *                image to be copyed.
 *      dy_b      Number of rows on the top edge of the
 *                image to be copyed.
 *      cmask     Channel mask to indicate the channels to be convolved.
 *                Each bit of which represents a channel in the image. The
 *                channels corresponded to 1 bits are those to be processed.
 *
 * RESTRICTION
 *      The src and the dst must be the same type, same width, same height and have same number
 *      of channels (1, 2, 3, or 4). The unselected channels are not
 *      overwritten. If both src and dst have just one channel,
 *      cmask is ignored.
 *
 * DESCRIPTION
 *      Copy src edges  to dst edges.
 *
 *      The unselected channels are not overwritten.
 *      If src and dst have just one channel,
 *      cmask is ignored.
 */

#include "mlib_image.h"
#include "mlib_ImageConvEdge.h"

/***************************************************************/
#define EDGES(chan, type, mask)                                   \
{                                                                 \
  type *pdst = (type *) mlib_ImageGetData(dst);                   \
  type *psrc = (type *) mlib_ImageGetData(src);                   \
  mlib_s32 dst_stride = mlib_ImageGetStride(dst) / sizeof(type);  \
  mlib_s32 src_stride = mlib_ImageGetStride(src) / sizeof(type);  \
  mlib_s32 i, j, l;                                               \
  mlib_s32 testchan;                                              \
                                                                  \
  testchan = 1;                                                   \
  for (l = chan - 1; l >= 0; l--) {                               \
    if ((mask & testchan) == 0) {                                 \
      testchan <<= 1;                                             \
      continue;                                                   \
    }                                                             \
    testchan <<= 1;                                               \
    for (j = 0; j < dx_l; j++) {                                  \
      for (i = dy_t; i < (img_height - dy_b); i++) {              \
        pdst[i * dst_stride + l + j * chan] =                     \
          psrc[i * src_stride + l + j * chan];                    \
      }                                                           \
    }                                                             \
    for (j = 0; j < dx_r; j++) {                                  \
      for (i = dy_t; i < (img_height - dy_b); i++) {              \
        pdst[i * dst_stride + l + (img_width - 1 - j) * chan] =   \
          psrc[i * src_stride + l + (img_width - 1 - j) * chan];  \
      }                                                           \
    }                                                             \
    for (i = 0; i < dy_t; i++) {                                  \
      for (j = 0; j < img_width; j++) {                           \
        pdst[i * dst_stride + l + j * chan] =                     \
          psrc[i * src_stride + l + j * chan];                    \
      }                                                           \
    }                                                             \
    for (i = 0; i < dy_b; i++) {                                  \
      for (j = 0; j < img_width; j++) {                           \
        pdst[(img_height - 1 - i) * dst_stride + l + j * chan] =  \
          psrc[(img_height - 1 - i) * src_stride + l + j * chan]; \
      }                                                           \
    }                                                             \
  }                                                               \
}

/***************************************************************/
mlib_status mlib_ImageConvCopyEdge_Fp(mlib_image       *dst,
                                      const mlib_image *src,
                                      mlib_s32         dx_l,
                                      mlib_s32         dx_r,
                                      mlib_s32         dy_t,
                                      mlib_s32         dy_b,
                                      mlib_s32         cmask)
{
  mlib_s32 img_width  = mlib_ImageGetWidth(dst);
  mlib_s32 img_height = mlib_ImageGetHeight(dst);
  mlib_s32 channel    = mlib_ImageGetChannels(dst);

  if (dx_l + dx_r > img_width) {
    dx_l = img_width;
    dx_r = 0;
  }

  if (dy_t + dy_b > img_height) {
    dy_t = img_height;
    dy_b = 0;
  }

  if (channel == 1) cmask = 1;

  switch (mlib_ImageGetType(src)) {
    case MLIB_FLOAT:
      EDGES(channel,mlib_f32, cmask)
      break;
    case MLIB_DOUBLE:
      EDGES(channel,mlib_d64, cmask)
      break;
    default:
      return MLIB_FAILURE;
  }

  return MLIB_SUCCESS;
}

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