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// 242.keyscreen -- does 3-source chroma keying.
// 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: keyscreen <red> <green> <blue> <fuzzi red> <fuzzi green> <fuzzi blue>
//
// f2 is the key & target, f1 is the mask
//
#include <stdio.h>
#include <string.h>
#include "plugin.h"
void perform_effect(struct frame f, struct args a)
{
printf("Using keyscreen as effect does nothing!\n");
}
void perform_copy(struct frame f1, struct frame f2, struct args a)
{
short x, y, w, h;
pixel16 *pix1_16, *pix2_16;
pixel24 *pix1_24, *pix2_24;
pixel32 *pix1_32, *pix2_32;
byte redpix, greenpix, bluepix;
byte red, green, blue, check, rf, gf, bf;
char *t;
w = f1.width<f2.width ? f1.width : f2.width;
h = f1.height<f2.height ? f1.height : f2.height;
// get params
if(!a.s) return;
red = atoi(a.s);
if(!(t = strstr(a.s, " "))) return;
green = atoi(t+1);
if(!(t = strstr(t+1, " "))) return;
blue = atoi(t+1);
if(!(t = strstr(t+1, " "))) return;
rf = atoi(t+1);
if(!(t = strstr(t+1, " "))) return;
gf = atoi(t+1);
if(!(t = strstr(t+1, " "))) return;
bf = atoi(t+1);
printf("keyscreen: r%d g%d b%d rf%d gf%d bf%d\n", red, green, blue, rf, gf, bf);
// key all channels simultaneously
switch(f1.pixelformat)
{
case 16:
for(y = 0; y < h; y++)
{
pix1_16 = scanline16(f1, y);
pix2_16 = scanline16(f2, y);
for(x = 0; x < w; x++)
{
check = 0; // start with each pixel anew
redpix = r16(pix2_16[x]);
greenpix = g16(pix2_16[x]);
bluepix = b16(pix2_16[x]);
if ((redpix>=(red-rf))&&(redpix<=(red+rf))&&(greenpix>=(green-gf))&&(greenpix<=(green+gf))&&(bluepix>=(blue-bf))&&(bluepix<=(blue+bf)))
{
check = 1; // mask it
}
if(check) // output frame 1
{
pix2_16[x] = pix1_16[x];
}
}
}
break;
case 24:
for(y = 0; y < h; y++)
{
pix1_24 = scanline24(f1, y);
pix2_24 = scanline24(f2, y);
for(x = 0; x < w; x++)
{
check = 0; // start with each pixel anew
redpix = r24(pix2_24[x]);
greenpix = g24(pix2_24[x]);
bluepix = b24(pix2_24[x]);
if ((redpix>=(red-rf))&&(redpix<=(red+rf))&&(greenpix>=(green-gf))&&(greenpix<=(green+gf))&&(bluepix>=(blue-bf))&&(bluepix<=(blue+bf)))
{
check = 1; // mask it
}
if(check) // output frame 1
{
pix1_24[x] = pix1_24[x];
}
}
}
break;
case 32:
for(y = 0; y < h; y++)
{
pix1_32 = scanline32(f1, y);
pix2_32 = scanline32(f2, y);
for(x = 0; x < w; x++)
{
check = 0; // start with each pixel anew
redpix = r32(pix2_32[x]);
greenpix = g32(pix2_32[x]);
bluepix = b32(pix2_32[x]);
if ((redpix>=(red-rf))&&(redpix<=(red+rf))&&(greenpix>=(green-gf))&&(greenpix<=(green+gf))&&(bluepix>=(blue-bf))&&(bluepix<=(blue+bf)))
{
check = 1; // mask it
}
if(check) // output frame 1
{
pix2_32[x] = pix1_32[x];
}
}
}
break;
}
}
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