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// 242.constrain -- does color range constraining on an input image.
// by r. luke dubois (luke@music.columbia.edu),
// computer music center, columbia university, 2001.
//
// Pd / Framestein port by Olaf Matthes <olaf.matthes@gmx.de>, June 2002
//
// objects and source are provided without warranty of any kind, express or implied.
//
// usage: constrain <min red> <min green> <min blue> <max red> <max green> <max blue>
//
#include <stdio.h>
#include <string.h>
#include "plugin.h"
INFO("242.constrain -- does color range constraining on an input image")
void perform_effect(struct frame f, struct args a)
{
int x,y;
byte redmin, greenmin, bluemin, redmax, greenmax, bluemax;
byte redpix, greenpix, bluepix; // the color values
pixel16 *c16;
pixel24 *c24;
pixel32 *c32;
char *t;
// get params
if(!a.s) return;
redmin = atoi(a.s);
if(!(t = strstr(a.s, " "))) return;
greenmin = atoi(t+1);
if(!(t = strstr(t+1, " "))) return;
bluemin = atoi(t+1);
if(!(t = strstr(t+1, " "))) return;
redmax = atoi(t+1);
if(!(t = strstr(t+1, " "))) return;
greenmax = atoi(t+1);
if(!(t = strstr(t+1, " "))) return;
bluemax = atoi(t+1);
printf("constrain: rmin%d gmin%d bmin%d - rmax%d gmax%d - bmax%d\n",
redmin, greenmin, bluemin, redmax, greenmax, bluemax);
for(y = 0; y < f.height; y++)
{
for(x = 0; x < f.width; x++)
{
switch(f.pixelformat)
{
case 16:
c16 = scanline16(f, y);
redpix = r16(c16[x]);
greenpix = g16(c16[x]);
bluepix = b16(c16[x]);
if(redpix < redmin) redpix = redmin;
if(redpix > redmax) redpix = redmax;
if(greenpix < greenmin) greenpix = greenmin;
if(greenpix > greenmax) greenpix = greenmax;
if(bluepix < bluemin) bluepix = bluemin;
if(bluepix > bluemax) bluepix = bluemax;
// set the output pixel
c16[x] = rgbtocolor16(redpix, greenpix, bluepix);
break;
case 24:
c24 = scanline24(f, y);
redpix = r24(c24[x]);
greenpix = g24(c24[x]);
bluepix = b24(c24[x]);
if(redpix < redmin) redpix = redmin;
if(redpix > redmax) redpix = redmax;
if(greenpix < greenmin) greenpix = greenmin;
if(greenpix > greenmax) greenpix = greenmax;
if(bluepix < bluemin) bluepix = bluemin;
if(bluepix > bluemax) bluepix = bluemax;
// set the output pixel
c24[x] = rgbtocolor24(redpix, greenpix, bluepix);
break;
case 32:
c32 = scanline32(f, y);
redpix = r32(c32[x]);
greenpix = g32(c32[x]);
bluepix = b32(c32[x]);
if(redpix < redmin) redpix = redmin;
if(redpix > redmax) redpix = redmax;
if(greenpix < greenmin) greenpix = greenmin;
if(greenpix > greenmax) greenpix = greenmax;
if(bluepix < bluemin) bluepix = bluemin;
if(bluepix > bluemax) bluepix = bluemax;
// set the output pixel
c32[x] = rgbtocolor32(redpix, greenpix, bluepix);
break;
}
}
}
}
void perform_copy(struct frame f1, struct frame f2, struct args a)
{
printf("Using constrain as copy operation does nothing!\n");
}
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