mirror of https://github.com/GNOME/gimp.git
132 lines
3.5 KiB
C
132 lines
3.5 KiB
C
/* The GIMP -- an image manipulation program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* kernel_gen -- Copyright (C) 2000 Sven Neumann <sven@gimp.org>
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* Simple hack to create subsampling kernels for the brushes
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* as used in app/paint_core.c.
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* If you want to play with it, change some of the #defines at the
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* top and copy the output to apps/tools/paint_core_kernels.h.
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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, USA.
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*/
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#include <math.h>
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#include <stdio.h>
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#define STEPS 64
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#define KERNEL_WIDTH 3 /* changing these makes no sense */
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#define KERNEL_HEIGHT 3 /* changing these makes no sense */
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#define SUBSAMPLE 4
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#define THRESHOLD 0.25 /* try to change this one */
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#define SQR(x) ((x) * (x))
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static void
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create_kernel (double x,
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double y)
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{
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double value[KERNEL_WIDTH][KERNEL_HEIGHT];
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double dist_x;
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double dist_y;
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double sum;
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double w;
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int i, j;
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memset (value, 0, KERNEL_WIDTH * KERNEL_HEIGHT * sizeof (double));
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sum = 0.0;
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x += 1.0;
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y += 1.0;
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for (j = 0; j < STEPS * KERNEL_HEIGHT; j++)
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{
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dist_y = y - (((double)j + 0.5) / (double)STEPS);
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for (i = 0; i < STEPS * KERNEL_WIDTH; i++)
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{
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dist_x = x - (((double)i + 0.5) / (double)STEPS);
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/* I've tried to use a gauss function here instead of a
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threshold, but the result was not that impressive. */
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w = (SQR (dist_x) + SQR (dist_y)) < THRESHOLD ? 1.0 : 0.0;
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value[i / STEPS][j / STEPS] += w;
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sum += w;
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}
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}
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for (j = 0; j < KERNEL_HEIGHT; j++)
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{
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for (i = 0; i < KERNEL_WIDTH; i++)
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{
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w = 256.0 * (value[i][j] / sum);
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printf (" %3d,", (int)w);
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}
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}
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}
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int
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main (int argc,
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char **argv)
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{
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int i, j;
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double x, y;
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printf ("/* gimppaintcore-kernels.h\n"
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" *\n"
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" * This file was generated using kernelgen as found in the tools dir.\n");
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printf (" * (threshold = %g)\n", THRESHOLD);
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printf (" */\n\n");
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printf ("#ifndef __GIMP_PAINT_CORE_KERNELS_H__\n");
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printf ("#define __GIMP_PAINT_CORE_KERNELS_H__\n\n");
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printf ("#define KERNEL_WIDTH %d\n", KERNEL_WIDTH);
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printf ("#define KERNEL_HEIGHT %d\n", KERNEL_HEIGHT);
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printf ("#define KERNEL_SUBSAMPLE %d\n", SUBSAMPLE);
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printf ("\n\n");
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printf ("/* Brush pixel subsampling kernels */\n");
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printf ("static const int subsample[%d][%d][%d] =\n{\n",
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SUBSAMPLE + 1, SUBSAMPLE + 1, KERNEL_WIDTH * KERNEL_HEIGHT);
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for (j = 0; j <= SUBSAMPLE; j++)
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{
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y = (double)j / (double)(SUBSAMPLE);
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printf (" {\n");
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for (i = 0; i <= SUBSAMPLE; i++)
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{
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x = (double)i / (double)(SUBSAMPLE);
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printf (" {");
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create_kernel (x, y);
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printf (" }%c\n", i < SUBSAMPLE ? ',' : ' ');
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}
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printf (" }%c\n", j < SUBSAMPLE ? ',' : ' ');
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}
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printf ("};\n\n");
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printf ("#endif /* __GIMP_PAINT_CORE_KERNELS_H__\n");
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exit (0);
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}
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