mirror of
https://github.com/game-stop/veejay.git
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90 lines
2.3 KiB
C
90 lines
2.3 KiB
C
/*
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* Linux VeeJay
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*
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* Copyright(C)2015 Niels Elburg <nwelburg@gmail.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License , or (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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/*
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* Add pseudo random noise to image
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*/
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#include <config.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <libvjmem/vjmem.h>
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#include "common.h"
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#include "randnoise.h"
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vj_effect *randnoise_init(int w, int h)
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{
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vj_effect *ve = (vj_effect *) vj_calloc(sizeof(vj_effect));
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ve->num_params = 2;
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ve->defaults = (int *) vj_calloc(sizeof(int) * ve->num_params); /* default values */
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ve->limits[0] = (int *) vj_calloc(sizeof(int) * ve->num_params); /* min */
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ve->limits[1] = (int *) vj_calloc(sizeof(int) * ve->num_params); /* max */
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ve->limits[0][0] = -255;
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ve->limits[1][0] = 255;
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ve->limits[0][1] = -255;
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ve->limits[1][1] = 255;
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ve->defaults[0] = -16;
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ve->defaults[1] = 16;
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ve->description = "Randnoise";
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ve->sub_format = -1;
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ve->extra_frame = 0;
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ve->parallel = 1;
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ve->has_user = 0;
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ve->param_description = vje_build_param_list( ve->num_params, "Min", "Max" );
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return ve;
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}
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static __thread unsigned long x = 123456789, y = 362436069, z = 521288629;
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void randnoise_apply( VJFrame *frame, int min, int max)
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{
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int i;
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const unsigned int len = frame->len;
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uint8_t *Y = frame->data[0];
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unsigned long t;
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for( i = 0; i < len; i ++ )
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{
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//xor shift
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x ^= x << 16;
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x ^= x >> 5;
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x ^= x << 1;
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t = x;
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x = y;
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y = z;
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z = t ^ x ^ y;
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//z is the new pseudo random number
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int rv = (z % max) + min;
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int y0 = Y[i] + rv;
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if( y0 > pixel_Y_hi_ )
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y0 = pixel_Y_hi_;
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else if( y0 < pixel_Y_lo_ )
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y0 = pixel_Y_lo_;
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Y[i] = y0;
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}
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}
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