mirror of
https://github.com/game-stop/veejay.git
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142 lines
3.7 KiB
C
142 lines
3.7 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 "gammacompr.h"
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/*
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* Before applying Strong Luma Overlay, apply this effect ;)
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*
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*/
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vj_effect *gammacompr_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 = 3;
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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] = 3000;
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ve->defaults[1] = 240;
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ve->defaults[2] = 0;
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ve->limits[0][0] = 0;
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ve->limits[1][0] = 6000;
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ve->limits[0][1] = 0;
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ve->limits[1][1] = 0xff;
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ve->limits[0][2] = 0;
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ve->limits[1][2] = 0xff;
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ve->description = "Gamma Compression";
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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 Compression", "White Threshold", "Black Threshold");
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ve->parallel = 1;
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return ve;
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}
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#define GAMMA_MAX 256
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typedef struct {
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double *gamma_table;
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double gamma_value;
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} gammacompr_t;
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void *gammacompr_malloc(int w, int h)
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{
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gammacompr_t *g = (gammacompr_t*) vj_calloc(sizeof(gammacompr_t));
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if(!g) {
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return NULL;
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}
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g->gamma_table = (double*) vj_calloc(sizeof(double) * GAMMA_MAX );
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if(!g->gamma_table) {
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free(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 gammacompr_free(void *ptr)
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{
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gammacompr_t *g = (gammacompr_t*) ptr;
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free(g->gamma_table);
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free(g);
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}
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static void gammacompr_setup(gammacompr_t *g)
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{
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int i;
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double val;
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double gm = (double) GAMMA_MAX;
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for (i = 0; i < GAMMA_MAX; i++) {
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val = i / gm;
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val = pow(val, g->gamma_value + ((double) i * 0.01));
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val = gm * val;
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g->gamma_table[i] = (val < 0.0 ? 0.0 : val > 255.0 ? 255.0 : val);
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}
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}
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void gammacompr_apply(void *ptr, VJFrame *frame, int *args ) {
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int value = args[0];
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int white_threshold = args[1];
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int black_threshold = args[2];
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gammacompr_t *g = (gammacompr_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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uint8_t *U = frame->data[1];
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uint8_t *V = frame->data[2];
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double v = ( (double) value - 3000.0) / 1000.0;
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if (v != g->gamma_value) {
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g->gamma_value = v;
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gammacompr_setup(g);
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}
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double *gamma_table = g->gamma_table;
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for (i = 0; i < len; i++) {
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Y[i] = (uint8_t) gamma_table[Y[i]];
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}
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if(white_threshold > 0) {
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for ( i = 0; i < len; i ++ ) {
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if( Y[i] > white_threshold ) {
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U[i] = 128;
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V[i] = 128;
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}
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}
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}
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if( black_threshold > 0 ) {
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for( i = 0; i < len; i ++ ) {
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if( Y[i] < black_threshold) {
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U[i] = 128;
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V[i] = 128;
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}
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}
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}
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}
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