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SGI Developer Toolbox 6.1
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SGI Developer Toolbox 6.1 - Disc 4.iso
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gdith.c
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C/C++ Source or Header
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1994-08-01
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4KB
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161 lines
/*
* Copyright (c) 1992 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 <math.h>
#include "video.h"
#include "proto.h"
#include "dither.h"
/* 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];
/* Arrays holding quantized value ranged for lum, cr, and cb. */
int *lum_values;
int *cr_values;
int *cb_values;
/*
*--------------------------------------------------------------
*
* InitColor --
*
* Initialized lum, cr, and cb quantized range value arrays.
*
* Results:
* None.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
void
InitColor()
{
int i;
static int initcolor_ok;
if(!initcolor_ok)
{
for (i=0; i<LUM_RANGE; i++) {
lum_values[i] = ((i * 256) / (LUM_RANGE)) + (256/(LUM_RANGE*2));
}
for (i=0; i<CR_RANGE; i++) {
cr_values[i] = ((i * 256) / (CR_RANGE)) + (256/(CR_RANGE*2));
}
for (i=0; i<CB_RANGE; i++) {
cb_values[i] = ((i * 256) / (CB_RANGE)) + (256/(CB_RANGE*2));
}
}
initcolor_ok = 1;
}
#if 0
/*
*--------------------------------------------------------------
*
* 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 char l, cr, cb;
unsigned char *r, *g, *b;
{
double fl, fcr, fcb, fr, fg, fb;
fl = (double) l;
fcr = ((double) cr) - 128.0;
fcb = ((double) cb) - 128.0;
fr = fl + (1.40200 * fcb);
fg = fl - (0.71414 * fcb) - (0.34414 * fcr);
fb = fl + (1.77200 * fcr);
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;
}
#endif
/*
*--------------------------------------------------------------
*
* ExecuteDisplay --
*
* Actually displays display plane in previously created window.
*
* Results:
* None.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
#if 0
void
ExecuteDisplay(vid_stream)
VidStream *vid_stream;
{
#if 0
totNumFrames++;
if (!quietFlag) {
fprintf (stderr, "%d\r", totNumFrames);
}
#endif
}
#endif