/* 
 * Linux VeeJay
 *
 * Copyright(C)2002 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 "fibdownscale.h"

vj_effect *fibdownscale_init(int w, int h)
{
	vj_effect *ve = (vj_effect *) vj_calloc(sizeof(vj_effect));
	ve->num_params = 2;
	ve->description = "Fibonacci Downscaler";
	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->defaults[0] = 0;
	ve->defaults[1] = 1;
	ve->limits[0][0] = 0;
	ve->limits[0][1] = 1;
	ve->limits[1][0] = 1;
	ve->limits[1][1] = 8;
	ve->sub_format = -1;
	ve->extra_frame = 0;
	ve->param_description = vje_build_param_list( ve->num_params, "Mode", "Fib" );
	ve->has_user = 0;

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

	vje_build_value_hint_list( ve->hints,ve->limits[0][1],0, "Down", "Rectangle" );

	return ve;
}

static void fibdownscale1_apply(VJFrame *frame, VJFrame *frame2)
{
	unsigned i, f1;
	const int len = frame->len >> 1;
	const int uv_len = (frame->ssm ? frame->len : frame->uv_len) >> 1;

	uint8_t *Y = frame->data[0];
	uint8_t *Cb = frame->data[1];
	uint8_t *Cr = frame->data[2];

	uint8_t *Y2 = frame2->data[0];
	uint8_t *Cb2 = frame2->data[1];
	uint8_t *Cr2 = frame2->data[2];

	/* do fib over half of image. (now we have 2 squares in upper half) */
	for (i = 2; i < len; i++)
	{
		f1 = (i + 1) + (i - 1);
		Y[i] = Y2[f1];
	}

	/* copy over first half (we could use veejay_memcpy) */
	veejay_memcpy( Y + len, Y, len ); 

	/* do the same thing for UV to get correct image */
	for (i = 2; i < uv_len; i++)
	{
		f1 = (i + 1) + (i - 1);
		Cb[i] = Cb2[f1];
		Cr[i] = Cr2[f1];
	}

	veejay_memcpy( Cb + uv_len, Cb , uv_len );
	veejay_memcpy( Cr + uv_len, Cr , uv_len );
}

static void fibrectangle1_apply(VJFrame *frame, VJFrame *frame2)
{
	unsigned int i, f1;
	const int len = frame->len>>1;
	const int uv_len = (frame->ssm ? frame->len: frame->uv_len)>>1;
	uint8_t *Y = frame->data[0];
	uint8_t *Cb = frame->data[1];
	uint8_t *Cr = frame->data[2];
	uint8_t *Y2 = frame2->data[0];
	uint8_t *Cb2 = frame2->data[1];
	uint8_t *Cr2 = frame2->data[2];

	for (i = 2; i < len; i++)
	{
		f1 = (i - 1) + (i - 2);
		Y[i] = Y2[f1];
	}

	for (i = 2; i < uv_len; i++)
	{
		f1 = (i - 1) + (i - 2);
		Cb[i] = Cb2[f1];
		Cr[i] = Cr2[f1];
	}
}

void fibdownscale_apply(void *ptr, VJFrame *frame, int *args ) {
    int n = args[0];
    int repeat = args[1];

    VJFrame *frame2 = frame;

    for( int i = 0; i < repeat ; i ++ ) {
	    if (n == 0)
		    fibdownscale1_apply(frame, frame2);
	    if (n == 1)
		    fibrectangle1_apply(frame, frame2);
    }
}