/*
 * Copyright (C) 2006 Evgeniy Stepanov <eugeni.stepanov@gmail.com>
 *
 * This file is part of MPlayer.
 *
 * MPlayer 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.
 *
 * MPlayer 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 MPlayer; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "config.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include <assert.h>
#include <libavutil/common.h>

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

#include "img_format.h"
#include "mp_image.h"
#include "vf.h"
#include "sub/sub.h"
#include "sub/dec_sub.h"

#include "libvo/fastmemcpy.h"
#include "libvo/csputils.h"

#include "m_option.h"
#include "m_struct.h"

static const struct vf_priv_s {
    int outh, outw;

    unsigned int outfmt;
    struct mp_csp_details csp;

    struct osd_state *osd;
    struct mp_osd_res dim;
} vf_priv_dflt = {
    .csp = MP_CSP_DETAILS_DEFAULTS,
};

static int config(struct vf_instance *vf,
                  int width, int height, int d_width, int d_height,
                  unsigned int flags, unsigned int outfmt)
{
    struct MPOpts *opts = vf->opts;
    if (outfmt == IMGFMT_IF09)
        return 0;

    vf->priv->outh = height + opts->ass_top_margin + opts->ass_bottom_margin;
    vf->priv->outw = width;

    if (!opts->screen_size_x && !opts->screen_size_y) {
        d_width = d_width * vf->priv->outw / width;
        d_height = d_height * vf->priv->outh / height;
    }

    double dar = (double)d_width / d_height;
    double sar = (double)width / height;

    vf->priv->dim = (struct mp_osd_res) {
        .w = vf->priv->outw,
        .h = vf->priv->outh,
        .mt = opts->ass_top_margin,
        .mb = opts->ass_bottom_margin,
        .display_par = sar / dar,
        .video_par = dar / sar,
    };

    return vf_next_config(vf, vf->priv->outw, vf->priv->outh, d_width,
			  d_height, flags, outfmt);
}

static void get_image(struct vf_instance *vf, mp_image_t *mpi)
{
    if (mpi->type == MP_IMGTYPE_IPB)
        return;
    if (mpi->flags & MP_IMGFLAG_PRESERVE)
        return;
    if (mpi->imgfmt != vf->priv->outfmt)
        return;                                     // colorspace differ

    // width never changes, always try full DR
    mpi->priv = vf->dmpi = vf_get_image(vf->next, mpi->imgfmt, mpi->type,
                                        mpi->flags | MP_IMGFLAG_READABLE,
                                        FFMAX(mpi->width,  vf->priv->outw),
                                        FFMAX(mpi->height, vf->priv->outh));

    if ((vf->dmpi->flags & MP_IMGFLAG_DRAW_CALLBACK) &&
        !(vf->dmpi->flags & MP_IMGFLAG_DIRECT)) {
        mp_tmsg(MSGT_ASS, MSGL_INFO, "Full DR not possible, trying SLICES instead!\n");
        return;
    }

    int tmargin = vf->opts->ass_top_margin;
    // set up mpi as a cropped-down image of dmpi:
    if (mpi->flags & MP_IMGFLAG_PLANAR) {
        mpi->planes[0] = vf->dmpi->planes[0] +  tmargin * vf->dmpi->stride[0];
        mpi->planes[1] = vf->dmpi->planes[1] + (tmargin >> mpi->chroma_y_shift) * vf->dmpi->stride[1];
        mpi->planes[2] = vf->dmpi->planes[2] + (tmargin >> mpi->chroma_y_shift) * vf->dmpi->stride[2];
        mpi->stride[1] = vf->dmpi->stride[1];
        mpi->stride[2] = vf->dmpi->stride[2];
    } else {
        mpi->planes[0] = vf->dmpi->planes[0] + tmargin * vf->dmpi->stride[0];
    }
    mpi->stride[0] = vf->dmpi->stride[0];
    mpi->width = vf->dmpi->width;
    mpi->flags |= MP_IMGFLAG_DIRECT;
    mpi->flags &= ~MP_IMGFLAG_DRAW_CALLBACK;
//	vf->dmpi->flags&=~MP_IMGFLAG_DRAW_CALLBACK;
}

static void blank(mp_image_t *mpi, int y1, int y2)
{
    int color[3] = {16, 128, 128};    // black (YUV)
    int y;
    unsigned char *dst;
    int chroma_rows = (y2 - y1) >> mpi->chroma_y_shift;

    dst = mpi->planes[0] + y1 * mpi->stride[0];
    for (y = 0; y < y2 - y1; ++y) {
        memset(dst, color[0], mpi->w);
        dst += mpi->stride[0];
    }
    dst = mpi->planes[1] + (y1 >> mpi->chroma_y_shift) * mpi->stride[1];
    for (y = 0; y < chroma_rows; ++y) {
        memset(dst, color[1], mpi->chroma_width);
        dst += mpi->stride[1];
    }
    dst = mpi->planes[2] + (y1 >> mpi->chroma_y_shift) * mpi->stride[2];
    for (y = 0; y < chroma_rows; ++y) {
        memset(dst, color[2], mpi->chroma_width);
        dst += mpi->stride[2];
    }
}

static int prepare_image(struct vf_instance *vf, mp_image_t *mpi)
{
    struct MPOpts *opts = vf->opts;
    int tmargin = opts->ass_top_margin;
    if (mpi->flags & MP_IMGFLAG_DIRECT
	|| mpi->flags & MP_IMGFLAG_DRAW_CALLBACK) {
        vf->dmpi = mpi->priv;
        if (!vf->dmpi) {
            mp_tmsg(MSGT_ASS, MSGL_WARN, "Why do we get NULL??\n");
	    return 0;
        }
        mpi->priv = NULL;
        // we've used DR, so we're ready...
        if (tmargin)
            blank(vf->dmpi, 0, tmargin);
        if (opts->ass_bottom_margin)
            blank(vf->dmpi, vf->priv->outh - opts->ass_bottom_margin,
                  vf->priv->outh);
        if (!(mpi->flags & MP_IMGFLAG_PLANAR))
            vf->dmpi->planes[1] = mpi->planes[1];             // passthrough rgb8 palette
        return 0;
    }

    // hope we'll get DR buffer:
    vf->dmpi = vf_get_image(vf->next, vf->priv->outfmt, MP_IMGTYPE_TEMP,
			    MP_IMGFLAG_ACCEPT_STRIDE | MP_IMGFLAG_READABLE,
                            vf->priv->outw, vf->priv->outh);

    // copy mpi->dmpi...
    if (mpi->flags & MP_IMGFLAG_PLANAR) {
        memcpy_pic(vf->dmpi->planes[0] + tmargin * vf->dmpi->stride[0],
                   mpi->planes[0],
		   mpi->w,
		   mpi->h,
                   vf->dmpi->stride[0],
		   mpi->stride[0]);
        memcpy_pic(vf->dmpi->planes[1] + (tmargin >> mpi->chroma_y_shift) * vf->dmpi->stride[1],
                   mpi->planes[1],
		   mpi->w >> mpi->chroma_x_shift,
		   mpi->h >> mpi->chroma_y_shift,
                   vf->dmpi->stride[1],
		   mpi->stride[1]);
        memcpy_pic(vf->dmpi->planes[2] + (tmargin >> mpi->chroma_y_shift) * vf->dmpi->stride[2],
                   mpi->planes[2],
		   mpi->w >> mpi->chroma_x_shift,
		   mpi->h >> mpi->chroma_y_shift,
                   vf->dmpi->stride[2],
		   mpi->stride[2]);
    } else {
        memcpy_pic(vf->dmpi->planes[0] + tmargin * vf->dmpi->stride[0],
                   mpi->planes[0],
		   mpi->w * (vf->dmpi->bpp / 8),
		   mpi->h,
                   vf->dmpi->stride[0],
		   mpi->stride[0]);
        vf->dmpi->planes[1] = mpi->planes[1];   // passthrough rgb8 palette
    }
    if (tmargin)
        blank(vf->dmpi, 0, tmargin);
    if (opts->ass_bottom_margin)
        blank(vf->dmpi, vf->priv->outh - opts->ass_bottom_margin,
              vf->priv->outh);
    return 0;
}

static int put_image(struct vf_instance *vf, mp_image_t *mpi, double pts)
{
    struct vf_priv_s *priv = vf->priv;
    struct osd_state *osd = priv->osd;

    prepare_image(vf, mpi);
    mp_image_set_colorspace_details(mpi, &priv->csp);

    if (pts != MP_NOPTS_VALUE)
        osd_draw_on_image(osd, priv->dim, pts, OSD_DRAW_SUB_FILTER, vf->dmpi);

    return vf_next_put_image(vf, vf->dmpi, pts);
}

static int query_format(struct vf_instance *vf, unsigned int fmt)
{
    switch (fmt) {
    case IMGFMT_YV12:
    case IMGFMT_I420:
    case IMGFMT_IYUV:
        return vf_next_query_format(vf, vf->priv->outfmt);
    }
    return 0;
}

static int control(vf_instance_t *vf, int request, void *data)
{
    switch (request) {
    case VFCTRL_SET_OSD_OBJ:
        vf->priv->osd = data;
        break;
    case VFCTRL_INIT_OSD:
        return CONTROL_TRUE;
    case VFCTRL_SET_YUV_COLORSPACE: {
        struct mp_csp_details colorspace = *(struct mp_csp_details *)data;
        vf->priv->csp = colorspace;
        break;
    }
    }
    return vf_next_control(vf, request, data);
}

static void uninit(struct vf_instance *vf)
{
    free(vf->priv);
}

static const unsigned int fmt_list[] = {
    IMGFMT_YV12,
    IMGFMT_I420,
    IMGFMT_IYUV,
    0
};

static int vf_open(vf_instance_t *vf, char *args)
{
    vf->priv->outfmt = vf_match_csp(&vf->next, fmt_list, IMGFMT_YV12);
    if (!vf->priv->outfmt) {
        uninit(vf);
        return 0;
    }

    vf->config = config;
    vf->query_format = query_format;
    vf->uninit    = uninit;
    vf->control   = control;
    vf->get_image = get_image;
    vf->put_image = put_image;
    vf->default_caps = VFCAP_OSD;
    return 1;
}

#define ST_OFF(f) M_ST_OFF(struct vf_priv_s, f)
static const m_option_t vf_opts_fields[] = {
    {NULL, NULL, 0, 0, 0, 0, NULL}
};

static const m_struct_t vf_opts = {
    "sub",
    sizeof(struct vf_priv_s),
    &vf_priv_dflt,
    vf_opts_fields
};

const vf_info_t vf_info_sub = {
    "Render subtitles",
    "sub",
    "Evgeniy Stepanov",
    "",
    vf_open,
    &vf_opts
};