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//
// overlay - overlay 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: overlay
//
#include <stdlib.h>
#include "plugin.h"
void perform_effect(struct frame f, struct args a)
{
printf("Using overlay 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 r, g, b;
w = f1.width<f2.width ? f1.width : f2.width;
h = f1.height<f2.height ? f1.height : f2.height;
printf("overlay\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++)
{
r = klamp255(r16(pix1_16[x]) < 128 ? (2*r16(pix1_16[x])*r16(pix2_16[x])/255) : 255-2*(255-r16(pix1_16[x]))*(255-r16(pix2_16[x]))/255);
g = klamp255(g16(pix1_16[x]) < 128 ? (2*g16(pix1_16[x])*g16(pix2_16[x])/255) : 255-2*(255-g16(pix1_16[x]))*(255-g16(pix2_16[x]))/255);
b = klamp255(b16(pix1_16[x]) < 128 ? (2*b16(pix1_16[x])*b16(pix2_16[x])/255) : 255-2*(255-b16(pix1_16[x]))*(255-b16(pix2_16[x]))/255);
pix2_16[x] = rgbtocolor16(r, g, b);
}
}
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++)
{
r = klamp255(r24(pix1_24[x]) < 128 ? (2*r24(pix1_24[x])*r24(pix2_24[x])/255) : 255-2*(255-r24(pix1_24[x]))*(255-r24(pix2_24[x]))/255);
g = klamp255(g24(pix1_24[x]) < 128 ? (2*g24(pix1_24[x])*g24(pix2_24[x])/255) : 255-2*(255-g24(pix1_24[x]))*(255-g24(pix2_24[x]))/255);
b = klamp255(b24(pix1_24[x]) < 128 ? (2*b24(pix1_24[x])*b24(pix2_24[x])/255) : 255-2*(255-b24(pix1_24[x]))*(255-b24(pix2_24[x]))/255);
pix2_24[x] = rgbtocolor24(r, g, b);
}
}
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++)
{
r = klamp255(r32(pix1_32[x]) < 128 ? (2*r32(pix1_32[x])*r32(pix2_32[x])/255) : 255-2*(255-r32(pix1_32[x]))*(255-r32(pix2_32[x]))/255);
g = klamp255(g32(pix1_32[x]) < 128 ? (2*g32(pix1_32[x])*g32(pix2_32[x])/255) : 255-2*(255-g32(pix1_32[x]))*(255-g32(pix2_32[x]))/255);
b = klamp255(b32(pix1_32[x]) < 128 ? (2*b32(pix1_32[x])*b32(pix2_32[x])/255) : 255-2*(255-b32(pix1_32[x]))*(255-b32(pix2_32[x]))/255);
pix2_32[x] = rgbtocolor32(r, g, b);
}
}
break;
}
}
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