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//
// compare - compare two images for differences
//
// if pixels are identical a background color get's displayed,
// returns number of pixels that are identical
//
// written by Olaf Matthes <olaf.matthes@gmx.de>
// inspired by code written by Trond Lossius, Bergen senter for elektronisk kunst (BEK)
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
// usage: compare <red fuzz> <green fuzz> <blue fuzz> <bg red> <bg green> <bg blue> [<receive name>]
// in case the (optional) receive name is specified, you get back the number of pixels that have been
// found to be identical in both images
//
#include <stdio.h>
#include <string.h>
#include "plugin.h"
INFO("compare two images for differences")
void perform_effect(struct frame f, struct args a)
{
printf("Using compare as effect does nothing!\n");
}
void perform_copy(struct frame f1, struct frame f2, struct args a)
{
short x, y, w, h, ret;
long count = 0;
pixel16 *pix1_16, *pix2_16;
pixel24 *pix1_24, *pix2_24;
pixel32 *pix1_32, *pix2_32;
byte redfuzzi, greenfuzzi, bluefuzzi, redbg, greenbg, bluebg, check;
char *t;
char *ret_count; // returns the result (number of identical pixels)
w = f1.width<f2.width ? f1.width : f2.width;
h = f1.height<f2.height ? f1.height : f2.height;
// get params
if(!a.s) return;
redfuzzi = klamp255(atoi(a.s));
if(!(t = strstr(a.s, " "))) return;
greenfuzzi = klamp255(atoi(t+1));
if(!(t = strstr(t+1, " "))) return;
bluefuzzi = klamp255(atoi(t+1));
if(!(t = strstr(t+1, " "))) return;
redbg = klamp255(atoi(t+1));
if(!(t = strstr(t+1, " "))) return;
greenbg = klamp255(atoi(t+1));
if(!(t = strstr(t+1, " "))) return;
bluebg = klamp255(atoi(t+1));
printf("compare: rf%d gf%d bf%d - rbg%d gbg%d bbg%d\n",
redfuzzi, greenfuzzi, bluefuzzi, redbg, greenbg, bluebg);
// get returnvaluereceivenames
if(!(t = strstr(t+1, " ")))
{
ret = 0; // don't return anything
}
else
{
ret = 1; // return number of identical pixels
ret_count = t+1;
t[0]=0;
}
switch(f1.pixelformat)
{
case 16:
// compare images pixel by pixel
for(y = 0; y < h; y++)
{
pix1_16 = scanline16(f1, y);
pix2_16 = scanline16(f2, y);
for(x = 0; x < w; x++)
{
check = 1;
if(abs(r16(pix1_16[x]) - r16(pix2_16[x])) > redfuzzi)
check = 0;
else if(abs(g16(pix1_16[x]) - g16(pix2_16[x])) > greenfuzzi)
check = 0;
else if(abs(b16(pix1_16[x]) - b16(pix2_16[x])) > bluefuzzi)
check = 0;
if(check)
{
pix2_16[x] = rgbtocolor16(redbg, greenbg, bluebg);
count++;
}
}
}
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 = 1;
if(abs(r24(pix1_24[x]) - r24(pix2_24[x])) > redfuzzi)
check = 0;
else if(abs(g24(pix1_24[x]) - g24(pix2_24[x])) > greenfuzzi)
check = 0;
else if(abs(b24(pix1_24[x]) - b24(pix2_24[x])) > bluefuzzi)
check = 0;
if(check)
{
pix1_24[x] = rgbtocolor24(redbg, greenbg, bluebg);
count++;
}
}
}
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 = 1;
if(abs(r32(pix1_32[x]) - r32(pix2_32[x])) > redfuzzi)
check = 0;
else if(abs(g32(pix1_32[x]) - g32(pix2_32[x])) > greenfuzzi)
check = 0;
else if(abs(b32(pix1_32[x]) - b32(pix2_32[x])) > bluefuzzi)
check = 0;
if(check)
{
pix2_32[x] = rgbtocolor32(redbg, greenbg, bluebg);
count++;
}
}
}
break;
}
// return-value:
//
// framestein will send data given in the form "pd_receiver_name=value"
// back to pd.
if(ret)sprintf(a.ret, "%s=%d", ret_count, count);
}
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