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// 242.modgain -- does modulo channel shifting 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: modgain <red> <green> <blue>
//
#include <stdio.h>
#include <string.h>
#include <math.h>
#include "plugin.h"
INFO("242.modgain -- does modulo channel shifting on an input image")
void perform_effect(struct frame f, struct args arg)
{
int x,y;
int red, green, blue, alpha; // parameters
byte r, g, b, a;
byte bits = f.pixelformat/8;
byte redpix, greenpix, bluepix; // the color values
pixel16 *c16;
pixel24 *c24;
pixel32 *c32;
char *t;
// get params
if(!arg.s) return;
red = atoi(arg.s);
if(!(t = strstr(arg.s, " "))) return;
green = atoi(t+1);
if(!(t = strstr(arg.s, " "))) return;
blue = atoi(t+1);
printf("modgain: r%d g%d b%d\n", red, green, blue);
for(y = 0; y < f.height; y++)
{
for(x = 0; x < f.width; x++)
{
switch(f.pixelformat)
{
case 16:
c16 = scanline16(f, y);
r = (r16(c16[x]) + red) % 255;
g = (g16(c16[x]) + green) % 255;
b = (b16(c16[x]) + blue) % 255;
// shift the pixels and wrap them
if(r<0) r += 255;
if(g<0) g += 255;
if(b<0) b += 255;
c16[x] = rgbtocolor16(r, g, b);
break;
case 24:
c24 = scanline24(f, y);
r = (r24(c24[x]) + red) % 255;
g = (g24(c24[x]) + green) % 255;
b = (b24(c24[x]) + blue) % 255;
// shift the pixels and wrap them
if(r<0) r += 255;
if(g<0) g += 255;
if(b<0) b += 255;
c24[x] = rgbtocolor24(r, g, b);
break;
case 32:
c32 = scanline32(f, y);
r = (r32(c32[x]) + red) % 255;
g = (g32(c32[x]) + green) % 255;
b = (b32(c32[x]) + blue) % 255;
// shift the pixels and wrap them
if(r<0) r += 255;
if(g<0) g += 255;
if(b<0) b += 255;
c32[x] = rgbtocolor32(r, g, b);
break;
}
}
}
}
void perform_copy(struct frame f1, struct frame f2, struct args a)
{
printf("Using modgain as copy operation does nothing!\n");
}
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