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/*
*
* This file is part of the XForms library package.
*
* XForms is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1, or
* (at your option) any later version.
*
* XForms 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with XForms; see the file COPYING. If not, write to
* the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA.
*
*/
/*
* $Id: image_combine.c,v 1.0 2002/05/08 05:16:30 zhao Release $
*
*.
* This file is part of the XForms library package.
* Copyright (c) 1996-2002 T.C. Zhao and Mark Overmars
* All rights reserved.
*.
*
*
* combine two images in the following way
* IM = IM1 * alpha + IM2 * (1-alpha)
*
*/
/*** UNFINISHED and UNTESTED */
#include "forms.h"
#include "flimage.h"
#include "flimage_int.h"
FL_IMAGE* flimage_combine(FL_IMAGE *im1, FL_IMAGE *im2, double alpha)
{
FL_IMAGE *ret;
int i, w, h, x, y;
if ((!im1 || im1->w <= 0) || (!im2 || im2->w <= 0))
return 0;
if(!(ret = flimage_alloc()))
{
flimage_error(im1, "can't allocate resulting image");
return 0;
}
ret->w = im1->w;
ret->h = im1->h;
ret->type = FLIMAGE_RGB;
flimage_get_linearlut(ret);
/* convert to RGB */
flimage_convert(im1, FLIMAGE_RGB, 0);
flimage_convert(im2, FLIMAGE_RGB, 0);
/* populate the lut */
for ( i = 0; i <= FL_PCMAX; i++)
{
ret->llut[0][i] = (i* alpha + 0.5f);
ret->llut[1][i] = (i - ret->llut[0][i]);
}
w = FL_min(im1->w, im2->w);
h = FL_min(im1->h, im2->h);
for ( y = 0; y < h; y++)
{
for ( x = 0; x < w; x++)
{
ret->red[y][x] = ret->llut[0][im1->red[y][x]] +
ret->llut[1][im2->red[y][x]];
ret->green[y][x] = ret->llut[0][im1->green[y][x]] +
ret->llut[1][im2->green[y][x]];
ret->blue[y][x] = ret->llut[0][im1->blue[y][x]] +
ret->llut[1][im2->blue[y][x]];
}
for ( ; x < im1->w; x++)
{
ret->red[y][x] = im1->red[y][x];
ret->green[y][x] = im1->green[y][x];
ret->blue[y][x] = im1->blue[y][x];
}
}
for ( ; y < im1->h; y++)
{
for ( x = 0; x < im1->w; x++)
{
ret->red[y][x] = im1->red[y][x];
ret->green[y][x] = im1->green[y][x];
ret->blue[y][x] = im1->blue[y][x];
}
}
return ret;
}
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