mirror of
https://github.com/game-stop/veejay.git
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96 lines
2.5 KiB
C
96 lines
2.5 KiB
C
/*
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* Linux VeeJay
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*
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* Copyright(C)2002 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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#include "common.h"
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#include <veejaycore/vjmem.h>
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#include "gamma.h"
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typedef struct {
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int gamma_flag;
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uint8_t table[256];
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} gamma_t;
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vj_effect *gamma_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 = 1;
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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] = 124;
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ve->limits[0][0] = 0;
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ve->limits[1][0] = 500;
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ve->description = "Gamma Correction";
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ve->extra_frame = 0;
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ve->sub_format = -1;
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ve->has_user = 0;
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ve->param_description = vje_build_param_list(ve->num_params, "Gamma");
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ve->parallel = 1;
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return ve;
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}
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void *gamma_malloc(int w, int h) {
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gamma_t *g = (gamma_t*) vj_calloc( sizeof(gamma_t) );
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if(!g) {
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return NULL;
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}
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return (void*) g;
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}
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void gamma_free(void *ptr) {
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gamma_t *g = (gamma_t*) ptr;
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free(g);
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}
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static void gamma_setup(gamma_t *g, int width, int height, double gamma_value)
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{
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int i;
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double val;
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for (i = 0; i < 256; i++) {
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val = i / 256.0;
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val = pow(val, gamma_value);
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val = 256.0 * val;
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g->table[i] = val;
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}
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}
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void gamma_apply(void *ptr, VJFrame *frame, int *args ) {
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int gamma_value = args[0];
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gamma_t *g = (gamma_t*) ptr;
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unsigned int i;
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const int len = frame->len;
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uint8_t *Y = frame->data[0];
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if (gamma_value != g->gamma_flag) {
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gamma_setup(g, frame->width, frame->height, (double) (gamma_value / 100.0));
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g->gamma_flag = gamma_value;
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}
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uint8_t *table = g->table;
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for (i = 0; i < len; i++) {
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Y[i] = (uint8_t) table[Y[i]];
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}
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}
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