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/*

 * gray.c --

 *

 *      More procedures to dither grey-scale images.

 *

 */

/*

 * Copyright (c) 1995 The Regents of the University of California.

 * All rights reserved.

 *

 * Permission to use, copy, modify, and distribute this software and its

 * documentation for any purpose, without fee, and without written agreement is

 * hereby granted, provided that the above copyright notice and the following

 * two paragraphs appear in all copies of this software.

 *

 * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR

 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT

 * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF

 * CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 *

 * THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,

 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY

 * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS

 * ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO

 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.

 */

#include "video.h"

#include "proto.h"

#include "dither.h"

/*

 *--------------------------------------------------------------

 *

 * GrayDitherImage --

 *

 *      Dithers image into 128 gray scales. Simply maps luminance

 *      value into 1 of 128 gray scale colors (divide by two, essentially).

 *

 * Results:

 *      None.

 *

 * Side effects:

 *      None.

 *

 *--------------------------------------------------------------

 */

void

GrayDitherImage(lum, cr, cb, out, h, w)

    unsigned char *lum;

    unsigned char *cr;

    unsigned char *cb;

    unsigned char *out;

    int w, h;

{

  int i, max = w*h/16;

  for (i=0; i<max; i++) {

    out[0] = pixel[lum[0]];

    out[1] = pixel[lum[1]];

    out[2] = pixel[lum[2]];

    out[3] = pixel[lum[3]];

    out[4] = pixel[lum[4]];

    out[5] = pixel[lum[5]];

    out[6] = pixel[lum[6]];

    out[7] = pixel[lum[7]];

    out[8] = pixel[lum[8]];

    out[9] = pixel[lum[9]];

    out[10] = pixel[lum[10]];

    out[11] = pixel[lum[11]];

    out[12] = pixel[lum[12]];

    out[13] = pixel[lum[13]];

    out[14] = pixel[lum[14]];

    out[15] = pixel[lum[15]];

    out += 16;

    lum += 16;

  }

}

void

Gray16DitherImage(lum, cr, cb, p_out, h, w)

    unsigned char *lum;

    unsigned char *cr;

    unsigned char *cb;

    unsigned char *p_out;

    int w, h;

{

  unsigned short *out = (unsigned short *)p_out;

  int i, max = w*h/16;

  for (i=0; i<max; i++) {

    out[0] = wpixel[lum[0]];

    out[1] = wpixel[lum[1]];

    out[2] = wpixel[lum[2]];

    out[3] = wpixel[lum[3]];

    out[4] = wpixel[lum[4]];

    out[5] = wpixel[lum[5]];

    out[6] = wpixel[lum[6]];

    out[7] = wpixel[lum[7]];

    out[8] = wpixel[lum[8]];

    out[9] = wpixel[lum[9]];

    out[10] = wpixel[lum[10]];

    out[11] = wpixel[lum[11]];

    out[12] = wpixel[lum[12]];

    out[13] = wpixel[lum[13]];

    out[14] = wpixel[lum[14]];

    out[15] = wpixel[lum[15]];

    out += 16;

    lum += 16;

  }

}

void

Gray32DitherImage(lum, cr, cb, p_out, h, w)

    unsigned char *lum;

    unsigned char *cr;

    unsigned char *cb;

    unsigned char *p_out;

    int w, h;

{

  unsigned int *out = (unsigned int *)p_out;

  int i, max = w*h/16;

  for (i=0; i<max; i++) {

    out[0] = wpixel[lum[0]];

    out[1] = wpixel[lum[1]];

    out[2] = wpixel[lum[2]];

    out[3] = wpixel[lum[3]];

    out[4] = wpixel[lum[4]];

    out[5] = wpixel[lum[5]];

    out[6] = wpixel[lum[6]];

    out[7] = wpixel[lum[7]];

    out[8] = wpixel[lum[8]];

    out[9] = wpixel[lum[9]];

    out[10] = wpixel[lum[10]];

    out[11] = wpixel[lum[11]];

    out[12] = wpixel[lum[12]];

    out[13] = wpixel[lum[13]];

    out[14] = wpixel[lum[14]];

    out[15] = wpixel[lum[15]];

    out += 16;

    lum += 16;

  }

}

/*

 *--------------------------------------------------------------

 *

 * Gray2DitherImage --

 *

 *      Dithers image into 128 gray scales. Simply maps luminance

 *      value into 1 of 128 gray scale colors (divide by two, essentially).

 *

 * Results:

 *      None.

 *

 * Side effects:

 *      None.

 *

 *--------------------------------------------------------------

 */

void

Gray2DitherImage(lum, cr, cb, p_out, h, w)

    unsigned char *lum;

    unsigned char *cr;

    unsigned char *cb;

    unsigned char *p_out;

    int w, h;

{

  int x, y;

  unsigned short *out = (unsigned short *)p_out;

  unsigned short *out2 = out + w;

  for (y=0; y<h; y++) {

    for (x=0; x<w; x+=16) {

      out[0] = out2[0] = wpixel[lum[0]];

      out[1] = out2[1] = wpixel[lum[1]];

      out[2] = out2[2] = wpixel[lum[2]];

      out[3] = out2[3] = wpixel[lum[3]];

      out[4] = out2[4] = wpixel[lum[4]];

      out[5] = out2[5] = wpixel[lum[5]];

      out[6] = out2[6] = wpixel[lum[6]];

      out[7] = out2[7] = wpixel[lum[7]];

      out[8] = out2[8] = wpixel[lum[8]];

      out[9] = out2[9] = wpixel[lum[9]];

      out[10] = out2[10] = wpixel[lum[10]];

      out[11] = out2[11] = wpixel[lum[11]];

      out[12] = out2[12] = wpixel[lum[12]];

      out[13] = out2[13] = wpixel[lum[13]];

      out[14] = out2[14] = wpixel[lum[14]];

      out[15] = out2[15] = wpixel[lum[15]];

      out += 16;

      out2 += 16;

      lum += 16;

    }

  out += w;

  out2 += w;

  }

}

void

Gray216DitherImage(lum, cr, cb, p_out, h, w)

    unsigned char *lum;

    unsigned char *cr;

    unsigned char *cb;

    unsigned char *p_out;

    int w, h;

{

  int x, y;

  unsigned int *out = (unsigned int *)p_out;

  unsigned int *out2 = out + w;

  for (y=0; y<h; y++) {

    for (x=0; x<w; x+=16) {

      out[0] = out2[0] = wpixel[lum[0]];

      out[1] = out2[1] = wpixel[lum[1]];

      out[2] = out2[2] = wpixel[lum[2]];

      out[3] = out2[3] = wpixel[lum[3]];

      out[4] = out2[4] = wpixel[lum[4]];

      out[5] = out2[5] = wpixel[lum[5]];

      out[6] = out2[6] = wpixel[lum[6]];

      out[7] = out2[7] = wpixel[lum[7]];

      out[8] = out2[8] = wpixel[lum[8]];

      out[9] = out2[9] = wpixel[lum[9]];

      out[10] = out2[10] = wpixel[lum[10]];

      out[11] = out2[11] = wpixel[lum[11]];

      out[12] = out2[12] = wpixel[lum[12]];

      out[13] = out2[13] = wpixel[lum[13]];

      out[14] = out2[14] = wpixel[lum[14]];

      out[15] = out2[15] = wpixel[lum[15]];

      out += 16;

      out2 += 16;

      lum += 16;

    }

  out += w;

  out2 += w;

  }

}

#ifndef SIXTYFOUR_BIT

void

Gray232DitherImage(lum, cr, cb, p_out, h, w)

    unsigned char *lum;

    unsigned char *cr;

    unsigned char *cb;

    unsigned char *p_out;

    int w, h;

{

  int x, y;

  unsigned int *out = (unsigned int *)p_out;

  unsigned int *out2 = out + w * 2;

  for (y=0; y<h; y++) {

    for (x=0; x<w; x+=16) {

      out[0] = out2[0] = out[1] = out2[1] = wpixel[lum[0]];

      out[2] = out2[2] = out[3] = out2[3] = wpixel[lum[1]];

      out[4] = out2[4] = out[5] = out2[5] = wpixel[lum[2]];

      out[6] = out2[6] = out[7] = out2[7] = wpixel[lum[3]];

      out[8] = out2[8] = out[9] = out2[9] = wpixel[lum[4]];

      out[10] = out2[10] = out[11] = out2[11] = wpixel[lum[5]];

      out[12] = out2[12] = out[13] = out2[13] = wpixel[lum[6]];

      out[14] = out2[14] = out[15] = out2[15] = wpixel[lum[7]];

      out[16] = out2[16] = out[17] = out2[17] = wpixel[lum[8]];

      out[18] = out2[18] = out[19] = out2[19] = wpixel[lum[9]];

      out[20] = out2[20] = out[21] = out2[21] = wpixel[lum[10]];

      out[22] = out2[22] = out[23] = out2[23] = wpixel[lum[11]];

      out[24] = out2[24] = out[25] = out2[25] = wpixel[lum[12]];

      out[26] = out2[26] = out[27] = out2[27] = wpixel[lum[13]];

      out[28] = out2[28] = out[29] = out2[29] = wpixel[lum[14]];

      out[30] = out2[30] = out[31] = out2[31] = wpixel[lum[15]];

      out += 32;

      out2 += 32;

      lum += 16;

    }

  out += w * 2;

  out2 += w * 2;

  }

}

#else /* def SIXTYFOUR_BIT */

void

Gray232DitherImage(lum, cr, cb, p_out, h, w)

    unsigned char *lum;

    unsigned char *cr;

    unsigned char *cb;

    unsigned char *p_out;

    int w, h;

{

  int x, y;

  unsigned long *out = (unsigned long *)p_out;

  unsigned long *out2 = out + w;

  for (y=0; y<h; y++) {

    for (x=0; x<w; x+=16) {

      out[0] = out2[0]   = wpixel[lum[0]];

      out[2] = out2[2]   = wpixel[lum[1]];

      out[4] = out2[4]   = wpixel[lum[2]];

      out[6] = out2[6]   = wpixel[lum[3]];

      out[8] = out2[8]   = wpixel[lum[4]];

      out[10] = out2[10] = wpixel[lum[5]];

      out[12] = out2[12] = wpixel[lum[6]];

      out[14] = out2[14] = wpixel[lum[7]];

      out[16] = out2[16] = wpixel[lum[8]];

      out[18] = out2[18] = wpixel[lum[9]];

      out[20] = out2[20] = wpixel[lum[10]];

      out[22] = out2[22] = wpixel[lum[11]];

      out[24] = out2[24] = wpixel[lum[12]];

      out[26] = out2[26] = wpixel[lum[13]];

      out[28] = out2[28] = wpixel[lum[14]];

      out[30] = out2[30] = wpixel[lum[15]];

      out += 16;

      out2 += 16;

      lum += 16;

    }

  out += w;

  out2 += w;

  }

}

#endif /* def SIXTYFOUR_BIT */