/* 
 * Linux VeeJay
 *
 * Copyright(C)2004 Niels Elburg <nwelburg@gmail.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License , or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307 , USA.
 */

#include "common.h"
#include <veejaycore/vjmem.h>
#include "toalpha.h"

typedef struct {
    int lookup_table[256];
} toalpha_t;

vj_effect *toalpha_init(int w, int h)
{
    vj_effect *ve = (vj_effect *) vj_calloc(sizeof(vj_effect));
    ve->num_params = 1;
    ve->description = "Alpha: Set from Image";
    ve->sub_format = -1;
    ve->extra_frame = 0;
    ve->parallel = 1;
	ve->has_user = 0;

	ve->defaults = (int *) vj_calloc(sizeof(int) * ve->num_params);     /* default values */
    ve->limits[0] = (int *) vj_calloc(sizeof(int) * ve->num_params);    /* min */
    ve->limits[1] = (int *) vj_calloc(sizeof(int) * ve->num_params);    /* max */
    ve->limits[0][0] = 0;
    ve->limits[1][0] = 1;
    ve->defaults[0] = !yuv_use_auto_ccir_jpeg();
    ve->param_description = vje_build_param_list( ve->num_params, "Scale Luminance to range 0-255 (1=on)" );

	ve->alpha = FLAG_ALPHA_OUT;

	ve->hints = vje_init_value_hint_list( ve->num_params );

	vje_build_value_hint_list( ve->hints, ve->limits[1][0], 0, "Verbatim", "Full range" );

    return ve;
}

void *toalpha_malloc(int w, int h)
{
    toalpha_t *t = (toalpha_t*) vj_calloc(sizeof(toalpha_t));
    if(!t) {
        return NULL;
    }
	__init_lookup_table( t->lookup_table, 256, 16.0f, 235.0f, 0, 255 ); 
    return t;
}

void toalpha_free(void *ptr) {
    free(ptr);
}


void toalpha_apply( void *ptr, VJFrame *frame, int *args )
{
	const int len = frame->len;
	uint8_t *a = frame->data[3];
	uint8_t *Y = frame->data[0];
	
    int mode = args[0];

    toalpha_t *t = (toalpha_t*) ptr;
    int *lookup_table = t->lookup_table;

	if( mode == 0 ) {
		veejay_memcpy(a, Y, len );
	}
	else {
		int i;
		for( i = 0; i < len; i ++ ) 
		{
			a[i] = lookup_table[ Y[i] ];
		}
	}
}