/*
    Copyright (C) 2002 Michael Niedermayer <michaelni@gmx.at>

    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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>

#include "config.h"
#include "mp_msg.h"
#include "help_mp.h"

#include "img_format.h"
#include "mp_image.h"
#include "vf.h"

//===========================================================================//

#include <inttypes.h>
#include <math.h>

#define MAX(a,b) ((a) > (b) ? (a) : (b))
#define MIN(a,b) ((a) < (b) ? (a) : (b))
#define ABS(a,b) ((a) > 0 ? (a) : -(a))

#define WIDTH 512
#define HEIGHT 512

struct vf_priv_s {
    int frame_num;
};

static int config(struct vf_instance* vf,
        int width, int height, int d_width, int d_height,
	unsigned int flags, unsigned int outfmt){

    if(vf_next_query_format(vf,IMGFMT_YV12)<=0){
	mp_msg(MSGT_VFILTER, MSGL_WARN, MSGTR_MPCODECS_WarnNextFilterDoesntSupport, "YV12");
	return 0;
    }

    //hmm whats the meaning of these ... ;)
    d_width= width= WIDTH;
    d_height= height= HEIGHT;

    return vf_next_config(vf,width,height,d_width,d_height,flags,IMGFMT_YV12);
}

static double c[64];

static void initIdct(void)
{
	int i;

	for (i=0; i<8; i++)
	{
		double s= i==0 ? sqrt(0.125) : 0.5;
		int j;

		for(j=0; j<8; j++)
			c[i*8+j]= s*cos((3.141592654/8.0)*i*(j+0.5));
	}
}


static void idct(uint8_t *dst, int dstStride, int src[64])
{
	int i, j, k;
	double tmp[64];

	for(i=0; i<8; i++)
	{
		for(j=0; j<8; j++)
		{
			double sum= 0.0;

			for(k=0; k<8; k++)
				sum+= c[k*8+j]*src[8*i+k];

			tmp[8*i+j]= sum;
		}
	}

	for(j=0; j<8; j++)
	{
		for(i=0; i<8; i++)
		{
			int v;
			double sum= 0.0;

			for(k=0; k<8; k++)
				sum+= c[k*8+i]*tmp[8*k+j];

			v= (int)floor(sum+0.5);
			if(v<0) v=0;
			else if(v>255) v=255;

			dst[dstStride*i + j] = v;
		}
	}
}

static void drawDc(uint8_t *dst, int stride, int color, int w, int h)
{
	int y;
	for(y=0; y<h; y++)
	{
		int x;
		for(x=0; x<w; x++)
		{
			dst[x + y*stride]= color;
		}
	}
}

static void drawBasis(uint8_t *dst, int stride, int amp, int freq, int dc)
{
	int src[64];

	memset(src, 0, 64*sizeof(int));
	src[0]= dc;
	if(amp) src[freq]= amp;
	idct(dst, stride, src);
}

static void drawCbp(uint8_t *dst[3], int stride[3], int cbp, int amp, int dc)
{
	if(cbp&1) drawBasis(dst[0]              , stride[0], amp, 1, dc);
	if(cbp&2) drawBasis(dst[0]+8            , stride[0], amp, 1, dc);
	if(cbp&4) drawBasis(dst[0]+  8*stride[0], stride[0], amp, 1, dc);
	if(cbp&8) drawBasis(dst[0]+8+8*stride[0], stride[0], amp, 1, dc);
	if(cbp&16)drawBasis(dst[1]              , stride[1], amp, 1, dc);
	if(cbp&32)drawBasis(dst[2]              , stride[2], amp, 1, dc);
}

static void dc1Test(uint8_t *dst, int stride, int w, int h, int off)
{
	const int step= MAX(256/(w*h/256), 1);
	int y;
	int color=off;
	for(y=0; y<h; y+=16)
	{
		int x;
		for(x=0; x<w; x+=16)
		{
			drawDc(dst + x + y*stride, stride, color, 8, 8);
			color+=step;
		}
	}
}

static void freq1Test(uint8_t *dst, int stride, int off)
{
	int y;
	int freq=0;
	for(y=0; y<8*16; y+=16)
	{
		int x;
		for(x=0; x<8*16; x+=16)
		{
			drawBasis(dst + x + y*stride, stride, 4*(96+off), freq, 128*8);
			freq++;
		}
	}
}

static void amp1Test(uint8_t *dst, int stride, int off)
{
	int y;
	int amp=off;
	for(y=0; y<16*16; y+=16)
	{
		int x;
		for(x=0; x<16*16; x+=16)
		{
			drawBasis(dst + x + y*stride, stride, 4*(amp), 1, 128*8);
			amp++;
		}
	}
}

static void cbp1Test(uint8_t *dst[3], int stride[3], int off)
{
	int y;
	int cbp=0;
	for(y=0; y<16*8; y+=16)
	{
		int x;
		for(x=0; x<16*8; x+=16)
		{
			uint8_t *dst1[3];
			dst1[0]= dst[0] + x*2 + y*2*stride[0];
			dst1[1]= dst[1] + x + y*stride[1];
			dst1[2]= dst[2] + x + y*stride[2];

			drawCbp(dst1, stride, cbp, (64+off)*4, 128*8);
			cbp++;
		}
	}
}

static void mv1Test(uint8_t *dst, int stride, int off)
{
	int y;
	for(y=0; y<16*16; y++)
	{
		int x;
		if(y&16) continue;
		for(x=0; x<16*16; x++)
		{
			dst[x + y*stride]= x + off*8/(y/32+1);
		}
	}
}

static void ring1Test(uint8_t *dst, int stride, int off)
{
	int y;
	int color=0;
	for(y=off; y<16*16; y+=16)
	{
		int x;
		for(x=off; x<16*16; x+=16)
		{
			drawDc(dst + x + y*stride, stride, ((x+y)&16) ? color : -color, 16, 16);
//			dst[x + y*stride]= 255 + (off&1);
			color++;
		}
	}
}

static void ring2Test(uint8_t *dst, int stride, int off)
{
	int y;
	for(y=0; y<16*16; y++)
	{
		int x;
		for(x=0; x<16*16; x++)
		{
			double d= sqrt((x-8*16)*(x-8*16) + (y-8*16)*(y-8*16));
			double r= d/20 - (int)(d/20);
			if(r<off/30.0)
			{
				dst[x + y*stride]= 255;
				dst[x + y*stride+256]= 0;
			}
			else{
				dst[x + y*stride]= x;
				dst[x + y*stride+256]= x;
			}
		}
	}
}

static int put_image(struct vf_instance* vf, mp_image_t *mpi, double pts){
    mp_image_t *dmpi;
    int frame= vf->priv->frame_num;

    // hope we'll get DR buffer:
    dmpi=vf_get_image(vf->next,IMGFMT_YV12,
	MP_IMGTYPE_TEMP, MP_IMGFLAG_ACCEPT_STRIDE,
	WIDTH, HEIGHT);

    // clean
    memset(dmpi->planes[0], 0, dmpi->stride[0]*dmpi->h);
    memset(dmpi->planes[1], 128, dmpi->stride[1]*dmpi->h>>dmpi->chroma_y_shift);
    memset(dmpi->planes[2], 128, dmpi->stride[2]*dmpi->h>>dmpi->chroma_y_shift);

    if(frame%30)
    {
        switch(frame/30)
	{
	case 0:   dc1Test(dmpi->planes[0], dmpi->stride[0], 256, 256, frame%30); break;
	case 1:   dc1Test(dmpi->planes[1], dmpi->stride[1], 256, 256, frame%30); break;
	case 2: freq1Test(dmpi->planes[0], dmpi->stride[0], frame%30); break;
	case 3: freq1Test(dmpi->planes[1], dmpi->stride[1], frame%30); break;
	case 4:  amp1Test(dmpi->planes[0], dmpi->stride[0], frame%30); break;
	case 5:  amp1Test(dmpi->planes[1], dmpi->stride[1], frame%30); break;
	case 6:  cbp1Test(dmpi->planes   , dmpi->stride   , frame%30); break;
	case 7:   mv1Test(dmpi->planes[0], dmpi->stride[0], frame%30); break;
	case 8: ring1Test(dmpi->planes[0], dmpi->stride[0], frame%30); break;
	case 9: ring2Test(dmpi->planes[0], dmpi->stride[0], frame%30); break;
	}
    }

    frame++;
    vf->priv->frame_num= frame;
    return vf_next_put_image(vf,dmpi, pts);
}

//===========================================================================//

static int query_format(struct vf_instance* vf, unsigned int fmt){
    return vf_next_query_format(vf,IMGFMT_YV12) & (~VFCAP_CSP_SUPPORTED_BY_HW);
}

static int open(vf_instance_t *vf, char* args){
    vf->config=config;
    vf->put_image=put_image;
    vf->query_format=query_format;
    vf->priv=malloc(sizeof(struct vf_priv_s));
    vf->priv->frame_num= args ? atoi(args) : 0;
    initIdct();
    return 1;
}

const vf_info_t vf_info_test = {
    "test pattern generator",
    "test",
    "Michael Niedermayer",
    "",
    open,
    NULL
};

//===========================================================================//