WebSVN - shark - Rev 3 - /shark/trunk/ports/mpeg/ordered2.c

/*
* ordered2.c --
*
* This file contains C code to implement a faster ordered dither
* than the one found in ordered.c. This dither is the default
* if no dither is specified.
*
*/

/*
* 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"

#define DITH_SIZE 16

/* Structures used to implement hybrid ordered dither/floyd-steinberg
dither algorithm.
*/

static unsigned char ***ditherPtr[DITH_SIZE];

/*
*--------------------------------------------------------------
*
* InitOrderedDither--
*
* Structures intialized for ordered dithering.
*
* Results:
* None.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/

void
InitOrdered2Dither()
{
unsigned char ****pos_2_cb;
unsigned char ***cb_2_cr;
unsigned char **cr_2_l;
int cb_val, cb_rval, cr_val, cr_rval, l_val, l_rval;
int i, j, pos;
int err_range, threshval;

pos_2_cb = (unsigned char ****) malloc (DITH_SIZE*sizeof(unsigned char ***));
cb_2_cr = (unsigned char ***) malloc(CB_RANGE*sizeof(unsigned char **));
cr_2_l = (unsigned char **) malloc(CR_RANGE*sizeof(unsigned char *));

for (pos=0; pos<DITH_SIZE; pos++) {

pos_2_cb[pos] = (unsigned char ***) malloc(256*(sizeof(unsigned char **)));

for (j=0; j<CB_RANGE; j++) {
cb_2_cr[j] = (unsigned char **) malloc(256*(sizeof(unsigned char *)));
}

for (cb_val=0; cb_val<cb_values[0]; cb_val++) {
(pos_2_cb[pos])[cb_val] = cb_2_cr[0];
}

for (cb_rval=0; cb_rval<(CB_RANGE-1); cb_rval++) {
err_range = cb_values[cb_rval+1] - cb_values[cb_rval];
threshval = ((pos*err_range)/DITH_SIZE)+cb_values[cb_rval];

for (cb_val=cb_values[cb_rval]; cb_val<cb_values[cb_rval+1]; cb_val++) {
if (cb_val>threshval) (pos_2_cb[pos])[cb_val] = cb_2_cr[cb_rval+1];
else (pos_2_cb[pos])[cb_val] = cb_2_cr[cb_rval];
}
}

for (cb_val=cb_values[CB_RANGE-1]; cb_val<256; cb_val++) {
(pos_2_cb[pos])[cb_val] = cb_2_cr[CB_RANGE-1];
}

for (cb_rval=0; cb_rval<CB_RANGE; cb_rval++) {

for (j=0; j<CR_RANGE; j++) {
cr_2_l[j] = (unsigned char *) malloc(256*(sizeof(unsigned char)));
}

for (cr_val=0; cr_val < cr_values[0]; cr_val++) {
(cb_2_cr[cb_rval])[cr_val] = cr_2_l[0];
}

for (cr_rval=0; cr_rval<(CR_RANGE-1); cr_rval++) {
err_range = cr_values[cr_rval+1] - cr_values[cr_rval];
threshval = ((pos*err_range)/DITH_SIZE)+cr_values[cr_rval];

for (cr_val=cr_values[cr_rval]; cr_val<cr_values[cr_rval+1]; cr_val++) {
if (cr_val>threshval) (cb_2_cr[cb_rval])[cr_val] = cr_2_l[cr_rval+1];
else (cb_2_cr[cb_rval])[cr_val] = cr_2_l[cr_rval];
}
}

for (cr_val=cr_values[CR_RANGE-1]; cr_val<256; cr_val++) {
(cb_2_cr[cb_rval])[cr_val] = cr_2_l[CR_RANGE-1];
}

for (cr_rval=0; cr_rval<CR_RANGE; cr_rval++) {

for (l_val = 0; l_val < lum_values[0]; l_val++) {
(cr_2_l[cr_rval])[l_val] = pixel[cb_rval+(cr_rval*CB_RANGE)+
(0*CR_RANGE*CB_RANGE)];
}

for (l_rval=0; l_rval<(LUM_RANGE-1); l_rval++) {
err_range = lum_values[l_rval+1] - lum_values[l_rval];
threshval = ((pos*err_range) /DITH_SIZE) + lum_values[l_rval];

for (l_val = lum_values[l_rval]; l_val < lum_values[l_rval+1]; l_val++) {
if (l_val>threshval) (cr_2_l[cr_rval])[l_val] =
pixel[cb_rval+(cr_rval*CB_RANGE)+((l_rval+1)*CR_RANGE*CB_RANGE)];
else (cr_2_l[cr_rval])[l_val] =
pixel[cb_rval+(cr_rval*CB_RANGE)+(l_rval*CR_RANGE*CB_RANGE)];
}
}

for (l_val = lum_values[LUM_RANGE-1]; l_val < 256; l_val++) {
(cr_2_l[cr_rval])[l_val] =
pixel[cb_rval+(cr_rval*CB_RANGE)+((LUM_RANGE-1)*CR_RANGE*CB_RANGE)];
}
}
}
}

for (i=0; i<DITH_SIZE; i++) {
ditherPtr[i] = pos_2_cb[i];
}
}

/*
*--------------------------------------------------------------
*
* Ordered2DitherImage --
*
* Dithers an image using an ordered dither.
* Assumptions made:
* 1) The color space is allocated y:cr:cb = 8:4:4
* 2) The spatial resolution of y:cr:cb is 4:1:1
* The channels are dithered based on the standard
* ordered dither pattern for a 4x4 area.
*
* Results:
* None.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
void
Ordered2DitherImage (lum, cr, cb, out, h, w)
unsigned char *lum;
unsigned char *cr;
unsigned char *cb;
unsigned char *out;
int w, h;
{
unsigned char *l, *r, *b, *o1, *o2;
unsigned char *l2;
unsigned char L, R, B;
int i, j;
unsigned char ***dp0 = ditherPtr[0];
unsigned char ***dp2 = ditherPtr[2];
unsigned char ***dp4 = ditherPtr[4];
unsigned char ***dp6 = ditherPtr[6];
unsigned char ***dp8 = ditherPtr[8];
unsigned char ***dp10 = ditherPtr[10];
unsigned char ***dp12 = ditherPtr[12];
unsigned char ***dp14 = ditherPtr[14];
unsigned char ***dp1 = ditherPtr[1];
unsigned char ***dp3 = ditherPtr[3];
unsigned char ***dp5 = ditherPtr[5];
unsigned char ***dp7 = ditherPtr[7];
unsigned char ***dp9 = ditherPtr[9];
unsigned char ***dp11 = ditherPtr[11];
unsigned char ***dp13 = ditherPtr[13];
unsigned char ***dp15 = ditherPtr[15];

l = lum;
l2 = lum+w;
r = cr;
b = cb;
o1 = out;
o2 = out+w;

for (i=0; i<h; i+=4) {

for (j=0; j<w; j+=8) {

R = r[0]; B = b[0];

L = l[0];
o1[0] = ((dp0[B])[R])[L];
L = l[1];
o1[1] = ((dp8[B])[R])[L];
L = l2[0];
o2[0] = ((dp12[B])[R])[L];
L = l2[1];
o2[1] = ((dp4[B])[R])[L];

R = r[1]; B = b[1];

L = l[2];
o1[2] = ((dp2[B])[R])[L];
L = l[3];
o1[3] = ((dp10[B])[R])[L];
L = l2[2];
o2[2] = ((dp14[B])[R])[L];
L = l2[3];
o2[3] = ((dp6[B])[R])[L];

R = r[2]; B = b[2];

L = l[4];
o1[4] = ((dp0[B])[R])[L];
L = l[5];
o1[5] = ((dp8[B])[R])[L];
L = l2[4];
o2[4] = ((dp12[B])[R])[L];
L = l2[5];
o2[5] = ((dp4[B])[R])[L];

R = r[3]; B = b[3];

L = l[6];
o1[6] = ((dp2[B])[R])[L];
L = l[7];
o1[7] = ((dp10[B])[R])[L];
L = l2[6];
o2[6] = ((dp14[B])[R])[L];
L = l2[7];
o2[7] = ((dp6[B])[R])[L];

l += 8;
l2 += 8;
r += 4;
b += 4;
o1 += 8;
o2 += 8;
}

l += w;
l2 += w;
o1 += w;
o2 += w;

for (j=0; j<w; j+=8) {

R = r[0]; B = b[0];

L = l[0];
o1[0] = ((dp3[B])[R])[L];
L = l[1];
o1[1] = ((dp11[B])[R])[L];
L = l2[0];
o2[0] = ((dp15[B])[R])[L];
L = l2[1];
o2[1] = ((dp7[B])[R])[L];

R = r[1]; B = b[1];

L = l[2];
o1[2] = ((dp1[B])[R])[L];
L = l[3];
o1[3] = ((dp9[B])[R])[L];
L = l2[2];
o2[2] = ((dp13[B])[R])[L];
L = l2[3];
o2[3] = ((dp5[B])[R])[L];

R = r[2]; B = b[2];

L = l[4];
o1[4] = ((dp3[B])[R])[L];
L = l[5];
o1[5] = ((dp11[B])[R])[L];
L = l2[4];
o2[4] = ((dp15[B])[R])[L];
L = l2[5];
o2[5] = ((dp7[B])[R])[L];

R = r[3]; B = b[3];

L = l[6];
o1[6] = ((dp1[B])[R])[L];
L = l[7];
o1[7] = ((dp9[B])[R])[L];
L = l2[6];
o2[6] = ((dp13[B])[R])[L];
L = l2[7];
o2[7] = ((dp5[B])[R])[L];

l += 8;
l2 += 8;
r += 4;
b += 4;
o1 += 8;
o2 += 8;
}

l += w;
l2 += w;
o1 += w;
o2 += w;
}
}

Subversion Repositories shark

(root)/shark/trunk/ports/mpeg/ordered2.c @ 956 - Rev 3