mlib_ImageConvClearEdge_Fp.c

/*
 * Copyright (c) 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.
 */


/*
 * FUNCTIONS
 *      mlib_c_ImageConvClearEdge  - Set edge of an image to a specific
 *                                        color. (for float-point image)
 *
 * SYNOPSIS
 *      mlib_status mlib_c_ImageConvClearEdge_Fp(mlib_image     *img,
 *                                               mlib_s32       dx_l,
 *                                               mlib_s32       dx_r,
 *                                               mlib_s32       dy_t,
 *                                               mlib_s32       dy_b,
 *                                               const mlib_d64 *color,
 *                                               mlib_s32       cmask)
 *
 * ARGUMENT
 *      img       Pointer to an image.
 *      dx_l      Number of columns on the left side of the
 *                image to be cleared.
 *      dx_r      Number of columns on the right side of the
 *                image to be cleared.
 *      dy_t      Number of rows on the top edge of the
 *                image to be cleared.
 *      dy_b      Number of rows on the top edge of the
 *                image to be cleared.
 *      color     Pointer to the color that the edges are set to.
 *      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
 *      img can have 1, 2, 3 or 4 channels of MLIB_FLOAT or MLIB_DOUBLE
 *      data type.
 *
 * DESCRIPTION
 *      Set edge of an image to a specific color.
 *      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 *pimg = (type *) mlib_ImageGetData(img);                           \
  type color_i;                                                           \
  mlib_s32 img_stride = mlib_ImageGetStride(img) / 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;                                                       \
    color_i = (type) color[l];                                            \
    for (j = 0; j < dx_l; j++) {                                          \
      for (i = dy_t; i < (img_height - dy_b); i++) {                      \
        pimg[i * img_stride + l + j * chan] = color_i;                    \
      }                                                                   \
    }                                                                     \
    for (j = 0; j < dx_r; j++) {                                          \
      for (i = dy_t; i < (img_height - dy_b); i++) {                      \
        pimg[i * img_stride + l + (img_width - 1 - j) * chan] = color_i;  \
      }                                                                   \
    }                                                                     \
    for (i = 0; i < dy_t; i++) {                                          \
      for (j = 0; j < img_width; j++) {                                   \
        pimg[i * img_stride + l + j * chan] = color_i;                    \
      }                                                                   \
    }                                                                     \
    for (i = 0; i < dy_b; i++) {                                          \
      for (j = 0; j < img_width; j++) {                                   \
        pimg[(img_height - 1 - i) * img_stride + l + j * chan] = color_i; \
      }                                                                   \
    }                                                                     \
  }                                                                       \
}

/***************************************************************/
mlib_status mlib_ImageConvClearEdge_Fp(mlib_image     *img,
                                       mlib_s32       dx_l,
                                       mlib_s32       dx_r,
                                       mlib_s32       dy_t,
                                       mlib_s32       dy_b,
                                       const mlib_d64 *color,
                                       mlib_s32       cmask)
{
  mlib_s32 img_width  = mlib_ImageGetWidth(img);
  mlib_s32 img_height = mlib_ImageGetHeight(img);
  mlib_s32 channel    = mlib_ImageGetChannels(img);

  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(img)) {
    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;
}

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