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// 242.traffic -- does tristimulus matrix operations 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.
//
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>
#include "plugin.h"
// tristimulus product used for matrix conversions
static void tristimulus_product(float *matrix, byte *input, byte *output)
{
int f, g;
for(f = 0; f < 3; f++)
{
output[f] = (byte)input[0]*matrix[f*3+0]+
input[1]*matrix[f*3+1]+
input[2]*matrix[f*3+2];
}
}
void perform_effect(struct frame f, struct args a)
{
int i, x, y;
float matrix[9];
byte bits = f.pixelformat/8;
byte input[3], output[3]; // the color values
byte r, g, b;
pixel16 *c16;
pixel24 *c24;
pixel32 *c32;
char *t;
// get matrix params
if(!a.s) return;
matrix[0] = atof(a.s);
for(i = 1; i < 9; i++)
{
if(!(t = strstr(t+1, " "))) return;
matrix[i] = atof(t+1);
}
printf("traffic: matrix: %d %d %d\n"
" %d %d %d\n"
" %d %d %d\n", matrix[0], matrix[1], matrix[2],
matrix[3], matrix[4], matrix[5], matrix[6], matrix[7], matrix[8]);
for(y = 0; y < f.height; y++)
{
for(x = 0; x < f.width; x++)
{
switch (f.pixelformat)
{
case 16:
c16 = scanline16(f, y);
input[0] = r16(c16[x]);
input[1] = g16(c16[x]);
input[2] = b16(c16[x]);
tristimulus_product(matrix,input,output);
r = output[0];
g = output[1];
b = output[2];
c16[x] = rgbtocolor16(r, g, b);
break;
case 24:
c24 = scanline24(f, y);
input[0] = r24(c24[x]);
input[1] = g24(c24[x]);
input[2] = b24(c24[x]);
tristimulus_product(matrix,input,output);
r = output[0];
g = output[1];
b = output[2];
c24[x] = rgbtocolor24(r, g, b);
break;
case 32:
c32 = scanline32(f, y);
input[0] = r32(c32[x]);
input[1] = g32(c32[x]);
input[2] = b32(c32[x]);
tristimulus_product(matrix,input,output);
r = output[0];
g = output[1];
b = output[2];
c32[x] = rgbtocolor32(r, g, b);
break;
}
}
}
}
void perform_copy(struct frame f1, struct frame f2, struct args a)
{
printf("Using traffic as copy operation does nothing!\n");
}
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