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//
// difference - difference of two images
//
// written by Olaf Matthes <olaf.matthes@gmx.de>
//
// 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: difference
//
#include "plugin.h"
void perform_effect(struct frame f, struct args a)
{
printf("Using difference 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;
w = f1.width<f2.width ? f1.width : f2.width;
h = f1.height<f2.height ? f1.height : f2.height;
printf("difference\n");
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++)
{
pix2_16[x] = rgbtocolor16(klamp255(abs(r16(pix1_16[x])-r16(pix2_16[x]))),
klamp255(abs(g16(pix1_16[x])-g16(pix2_16[x]))),
klamp255(abs(b16(pix1_16[x])-b16(pix2_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++)
{
pix2_24[x] = rgbtocolor24(klamp255(abs(r24(pix1_24[x])-r24(pix2_24[x]))),
klamp255(abs(g24(pix1_24[x])-g24(pix2_24[x]))),
klamp255(abs(b24(pix1_24[x])-b24(pix2_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++)
{
pix2_32[x] = rgbtocolor32(klamp255(abs(r32(pix1_32[x])-r32(pix2_32[x]))),
klamp255(abs(g32(pix1_32[x])-g32(pix2_32[x]))),
klamp255(abs(b32(pix1_32[x])-b32(pix2_32[x]))));
}
}
break;
}
}
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