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https://github.com/game-stop/veejay.git
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78 lines
2.3 KiB
C
78 lines
2.3 KiB
C
/*
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* Linux VeeJay
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*
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* Copyright(C)2002 Niels Elburg <elburg@hio.hen.nl>
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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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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <libvjmem/vjmem.h>
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#include "dither.h"
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vj_effect *dither_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->defaults[0] = 2;
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ve->defaults[1] = 0;
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ve->limits[0][0] = 2;
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ve->limits[1][0] = 255;
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ve->limits[0][1] = 0;
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ve->limits[1][1] = 1;
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ve->description = "Matrix Dithering";
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ve->sub_format = 0;
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ve->extra_frame = 0;
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ve->has_user = 0;
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ve->param_description = vje_build_param_list( ve->num_params, "Mode", "Value" );
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return ve;
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}
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void dither_apply(VJFrame *frame, int width, int height, int size,
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int random_on)
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{
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long int w_, h_;
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long int dith[size][size];
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long int i, j, d, v, l, m;
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uint8_t *Y = frame->data[0];
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for (l = 0; l < size; l++) {
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for (m = 0; m < size; m++) {
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dith[l][m] =
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1 + (int) ((double) size * rand() / (RAND_MAX + 1.0));
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}
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}
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for (h_ = 0; h_ < height; h_++) {
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j = h_ % size;
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for (w_ = 0; w_ < width; w_++) {
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i = w_ % size;
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d = dith[i][j] << 4;
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/* Luminance , dither image. Do
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this for U and V too, see what happens hehe */
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v = ((long) Y[((h_ * width) + w_)] + d);
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Y[(h_ * width) + w_] = (uint8_t) ((v >> 7) << 7);
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}
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}
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}
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void dither_free(){}
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