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https://github.com/gryf/wmaker.git
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86 lines
1.9 KiB
C
86 lines
1.9 KiB
C
/*
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* libwmfun - WindowMaker texture function library
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* Copyright (C) 1999 Tobias Gloth
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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* USA.
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*/
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/*
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* $Id$
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*
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* $Log$
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* Revision 1.1 2000/12/03 18:58:41 id
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* initiate plugins branch
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*
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* Revision 1.1.1.1 1999/02/21 17:16:47 gloth
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* initial revision
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*
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*/
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#include "generic.h"
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RImage *bilinear (int argc, char **argv, int width, int height,
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int relief) {
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int color[4][3];
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RImage *image;
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unsigned char *cptr;
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int i, j, k;
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argc--; argv++;
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if (!start_image ("bilinear", argc, 4, 5, width, height, &image)) {
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return (RImage *)0;
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}
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for (i=0; i<4; i++) {
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if (!parse_color (argv[i], color[i])) {
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error ("can't parse color: \"%s\"\n", argv[i]);
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return 0;
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}
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}
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cptr = image->data;
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for (i=0; i<height; i++) {
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int b = 0xff * i / height;
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int t = 0xff - b;
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for (j=0; j<width; j++) {
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int r = 0xff * j / width;
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int l = 0xff - r;
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int f[4];
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f[0] = (l*t) >> 8;
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f[1] = (r*t) >> 8;
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f[2] = (l*b) >> 8;
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f[3] = (r*b) >> 8;
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for (k=0; k<3; k++) {
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*cptr++ =
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( f[0] * color[0][k] +
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f[1] * color[1][k] +
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f[2] * color[2][k] +
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f[3] * color[3][k] ) >> 8;
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}
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if (RRGBAFormat==image->format)
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cptr++;
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}
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}
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return image;
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}
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