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

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

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


static void mirror(unsigned char* dst,unsigned char* src,int dststride,int srcstride,int w,int h,int bpp,unsigned int fmt){
    int y;
    for(y=0;y<h;y++){
	int x;
	switch(bpp){
	case 1:
	    for(x=0;x<w;x++) dst[x]=src[w-x-1];
	    break;
	case 2:
	    switch(fmt){
	    case IMGFMT_UYVY: {
		// packed YUV is tricky. U,V are 32bpp while Y is 16bpp:
		int w2=w>>1;
		for(x=0;x<w2;x++){
		    // TODO: optimize this...
		    dst[x*4+0]=src[0+(w2-x-1)*4];
		    dst[x*4+1]=src[3+(w2-x-1)*4];
		    dst[x*4+2]=src[2+(w2-x-1)*4];
		    dst[x*4+3]=src[1+(w2-x-1)*4];
		}
		break; }
	    case IMGFMT_YUY2:
	    case IMGFMT_YVYU: {
		// packed YUV is tricky. U,V are 32bpp while Y is 16bpp:
		int w2=w>>1;
		for(x=0;x<w2;x++){
		    // TODO: optimize this...
		    dst[x*4+0]=src[2+(w2-x-1)*4];
		    dst[x*4+1]=src[1+(w2-x-1)*4];
		    dst[x*4+2]=src[0+(w2-x-1)*4];
		    dst[x*4+3]=src[3+(w2-x-1)*4];
		}
		break; }
	    default:
		for(x=0;x<w;x++) *((short*)(dst+x*2))=*((short*)(src+(w-x-1)*2));
	    }
	    break;
	case 3:
	    for(x=0;x<w;x++){
		dst[x*3+0]=src[0+(w-x-1)*3];
		dst[x*3+1]=src[1+(w-x-1)*3];
		dst[x*3+2]=src[2+(w-x-1)*3];
	    }
	    break;
	case 4:
	    for(x=0;x<w;x++) *((int*)(dst+x*4))=*((int*)(src+(w-x-1)*4));
	}
	src+=srcstride;
	dst+=dststride;
    }
}

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

static int put_image(struct vf_instance* vf, mp_image_t *mpi, double pts){
    mp_image_t *dmpi;

    // hope we'll get DR buffer:
    dmpi=vf_get_image(vf->next,mpi->imgfmt,
	MP_IMGTYPE_TEMP, MP_IMGFLAG_ACCEPT_STRIDE,
	mpi->w, mpi->h);

    if(mpi->flags&MP_IMGFLAG_PLANAR){
	       mirror(dmpi->planes[0],mpi->planes[0],
	       dmpi->stride[0],mpi->stride[0],
	       dmpi->w,dmpi->h,1,mpi->imgfmt);
	       mirror(dmpi->planes[1],mpi->planes[1],
	       dmpi->stride[1],mpi->stride[1],
	       dmpi->w>>mpi->chroma_x_shift,dmpi->h>>mpi->chroma_y_shift,1,mpi->imgfmt);
	       mirror(dmpi->planes[2],mpi->planes[2],
	       dmpi->stride[2],mpi->stride[2],
	       dmpi->w>>mpi->chroma_x_shift,dmpi->h>>mpi->chroma_y_shift,1,mpi->imgfmt);
    } else {
	mirror(dmpi->planes[0],mpi->planes[0],
	       dmpi->stride[0],mpi->stride[0],
	       dmpi->w,dmpi->h,dmpi->bpp>>3,mpi->imgfmt);
	dmpi->planes[1]=mpi->planes[1]; // passthrough rgb8 palette
    }
    
    return vf_next_put_image(vf,dmpi, pts);
}

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

static int open(vf_instance_t *vf, char* args){
    //vf->config=config;
    vf->put_image=put_image;
    return 1;
}

const vf_info_t vf_info_mirror = {
    "horizontal mirror",
    "mirror",
    "Eyck",
    "",
    open,
    NULL
};

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