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/*

 * gdith.c --

 *

 *      Procedures dealing with grey-scale and mono dithering,

 *      as well as X Windows set up procedures.

 *

 */

/*

 * 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.

 */

/*

 * Portions of this software Copyright (c) 1995 Brown University.

 * 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 BROWN UNIVERSITY 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 BROWN

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

 *

 * BROWN UNIVERSITY 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 BROWN UNIVERSITY HAS NO OBLIGATION TO PROVIDE MAINTENANCE,

 * SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.

 */

#include <math.h>

#include "video.h"

#include "proto.h"

#include "dither.h"

#ifndef NOCONTROLS

#include "ctrlbar.h"

#endif

#include <sys/time.h>

#ifdef __STDC__

#include <stdlib.h>

#include <string.h>

#endif

/*

   Changes to make the code reentrant:

      X variables now passed in xinfo: display, ximage,cmap,window, gc, etc

      De-globalized: ditherType, matched_depth, totNumFrames

      vid_stream->film_has_ended instead of FilmState

   Additional changes:

      Now can name and position each movie window individually

      DISABLE_DITHER cpp define - do not include dither code if defined

      NOFRAMECOUNT cpp define - do not count frames when running without

         controls

      Short circuit InitColorDisplay if not displaying anything

      ExistingWindow default now 0

   -lsh@cs.brown.edu (Loring Holden)

*/

/* Range values for lum, cr, cb. */

int LUM_RANGE;

int CR_RANGE;

int CB_RANGE;

/* Array that remaps color numbers to actual pixel values used by X server. */

unsigned char pixel[256];

unsigned long wpixel[256];

/* Arrays holding quantized value ranged for lum, cr, and cb. */

int *lum_values;

int *cr_values;

int *cb_values;

/* Declaration of global variable containing dither type. */

/* Frame Rate Info */

extern int framerate;

/* Video rates table */

/* Cheat on Vid rates, round to 30, and use 30 if illegal value

   Except for 9, where Xing means 15, and given their popularity, we'll

   be nice and do it */

static int VidRateNum[16]={30, 24, 24, 25, 30, 30, 50, 60,

                         60, 15, 30, 30, 30, 30, 30, 30};

/* Luminance and chrominance lookup tables */

static double *L_tab, *Cr_r_tab, *Cr_g_tab, *Cb_g_tab, *Cb_b_tab;

/*

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

 *

 * InitColor --

 *

 *      Initialize lum, cr, and cb quantized range value arrays.

 *      Also initializes the lookup tables for the possible

 *      values of lum, cr, and cb.

 *    Color values from ITU-R BT.470-2 System B, G and SMPTE 170M

 *    see InitColorDither in 16bits.c for more

 *

 * Results:

 *      None.

 *

 * Side effects:

 *      None.

 *

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

 */

void

InitColor()

{

  int i, CR, CB;

  L_tab    = (double *)malloc(LUM_RANGE*sizeof(double));

  Cr_r_tab = (double *)malloc(CR_RANGE*sizeof(double));

  Cr_g_tab = (double *)malloc(CR_RANGE*sizeof(double));

  Cb_g_tab = (double *)malloc(CB_RANGE*sizeof(double));

  Cb_b_tab = (double *)malloc(CB_RANGE*sizeof(double));

  if (L_tab == NULL    || Cr_r_tab == NULL ||

      Cr_g_tab == NULL || Cb_g_tab == NULL ||

      Cb_b_tab == NULL) {

    fprintf(stderr, "Could not alloc memory in InitColor\n");

    exit(1);

  }

  for (i=0; i<LUM_RANGE; i++) {

    lum_values[i]  = ((i * 256) / (LUM_RANGE)) + (256/(LUM_RANGE*2));

    L_tab[i] = lum_values[i];

    if (gammaCorrectFlag) {

      L_tab[i] = GAMMA_CORRECTION(L_tab[i]);

    }

  }

  for (i=0; i<CR_RANGE; i++) {

    register double tmp;

    if (chromaCorrectFlag) {

      tmp = ((i * 256) / (CR_RANGE)) + (256/(CR_RANGE*2));

      Cr_r_tab[i] = (int) (0.419/0.299) * CHROMA_CORRECTION128D(tmp - 128.0);

      Cr_g_tab[i] = (int) -(0.299/0.419) * CHROMA_CORRECTION128D(tmp - 128.0);

      cr_values[i] = CHROMA_CORRECTION256(tmp);

    } else {

      tmp = ((i * 256) / (CR_RANGE)) + (256/(CR_RANGE*2));

      Cr_r_tab[i] = (int)  (0.419/0.299) * (tmp - 128.0);

      Cr_g_tab[i] = (int) -(0.299/0.419) * (tmp - 128.0);

      cr_values[i] = (int) tmp;

    }

  }

  for (i=0; i<CB_RANGE; i++) {

    register double tmp;

    if (chromaCorrectFlag) {

      tmp = ((i * 256) / (CB_RANGE)) + (256/(CB_RANGE*2));

      Cb_g_tab[i] = (int) -(0.114/0.331) * CHROMA_CORRECTION128D(tmp - 128.0);

      Cb_b_tab[i] = (int)  (0.587/0.331) * CHROMA_CORRECTION128D(tmp - 128.0);

      cb_values[i] = CHROMA_CORRECTION256(tmp);

    } else {

      tmp = ((i * 256) / (CB_RANGE)) + (256/(CB_RANGE*2));

      Cb_g_tab[i] = (int) -(0.114/0.331) * (tmp - 128.0);

      Cb_b_tab[i] = (int)  (0.587/0.331) * (tmp - 128.0);

      cb_values[i] = (int) tmp;

    }

  }

}

/*

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

 *

 * ConvertColor --

 *

 *      Given a l, cr, cb tuple, converts it to r,g,b.

 *

 * Results:

 *      r,g,b values returned in pointers passed as parameters.

 *

 * Side effects:

 *      None.

 *

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

 */

static void

ConvertColor(l, cr, cb, r, g, b)

     unsigned int l, cr, cb;

     unsigned char *r, *g, *b;

{

  double fl, fcr, fcb, fr, fg, fb;

/*

 * Old method w/o lookup table

 *

 * fl = 1.164*(((double) l)-16.0);

 * fcr =  ((double) cr) - 128.0;

 * fcb =  ((double) cb) - 128.0;

 *

 * fr = fl + (1.366 * fcr);

 * fg = fl - (0.700 * fcr) - (0.334 * fcb);

 * fb = fl + (1.732 * fcb);

 */

  fl = L_tab[l];

  fr = fl + Cr_r_tab[cr];

  fg = fl + Cr_g_tab[cr] + Cb_g_tab[cb];

  fb = fl + Cb_b_tab[cb];

  if (fr < 0.0) fr = 0.0;

  else if (fr > 255.0) fr = 255.0;

  if (fg < 0.0) fg = 0.0;

  else if (fg > 255.0) fg = 255.0;

  if (fb < 0.0) fb = 0.0;

  else if (fb > 255.0) fb = 255.0;

  *r = (unsigned char) fr;

  *g = (unsigned char) fg;

  *b = (unsigned char) fb;

}