/*
 * This file is part of mpv.
 *
 * mpv is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * mpv 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with mpv.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef MPLAYER_SUB_H
#define MPLAYER_SUB_H

#include <stddef.h>
#include <stdbool.h>
#include <stdint.h>

#include "options/m_option.h"

// NOTE: VOs must support at least SUBBITMAP_BGRA.
enum sub_bitmap_format {
    SUBBITMAP_EMPTY = 0,// no bitmaps; always has num_parts==0
    SUBBITMAP_LIBASS,   // A8, with a per-surface blend color (libass.color)
    SUBBITMAP_BGRA,     // IMGFMT_BGRA (MSB=A, LSB=B), scaled, premultiplied alpha

    SUBBITMAP_COUNT
};

struct sub_bitmap {
    void *bitmap;
    int stride;
    // Note: not clipped, going outside the screen area is allowed
    //       (except for SUBBITMAP_LIBASS, which is always clipped)
    int w, h;
    int x, y;
    int dw, dh;

    // If the containing struct sub_bitmaps has the packed field set, then this
    // is the position within the source. (Strictly speaking this is redundant
    // with the bitmap pointer.)
    int src_x, src_y;

    struct {
        uint32_t color;
    } libass;
};

struct sub_bitmaps {
    // For VO cache state (limited by MAX_OSD_PARTS)
    int render_index;

    enum sub_bitmap_format format;

    struct sub_bitmap *parts;
    int num_parts;

    // Packed representation of the bitmap data. If non-NULL, then the
    // parts[].bitmap pointer points into the image data here (and stride will
    // correspond to packed->stride[0]).
    //  SUBBITMAP_BGRA: IMGFMT_BGRA (exact match)
    //  SUBBITMAP_LIBASS: IMGFMT_Y8 (not the same, but compatible layout)
    // Other formats have this set to NULL.
    struct mp_image *packed;

    // Bounding box for the packed image. All parts will be within the bounding
    // box. (The origin of the box is at (0,0).)
    int packed_w, packed_h;

    int change_id;  // Incremented on each change (0 is never used)
};

struct sub_bitmap_list {
    // Combined change_id - of any of the existing items change (even if they
    // e.g. go away and are removed from items[]), this is incremented.
    int64_t change_id;

    // Bounding box for rendering. It's notable that SUBBITMAP_LIBASS images are
    // always within these bounds, while SUBBITMAP_BGRA is not necessarily.
    int w, h;

    // Sorted by sub_bitmaps.render_index. Unused parts are not in the array,
    // and you cannot index items[] with render_index.
    struct sub_bitmaps **items;
    int num_items;
};

struct sub_bitmap_copy_cache;
struct sub_bitmaps *sub_bitmaps_copy(struct sub_bitmap_copy_cache **cache,
                                     struct sub_bitmaps *in);

struct mp_osd_res {
    int w, h; // screen dimensions, including black borders
    int mt, mb, ml, mr; // borders (top, bottom, left, right)
    double display_par;
};

bool osd_res_equals(struct mp_osd_res a, struct mp_osd_res b);

// 0 <= sub_bitmaps.render_index < MAX_OSD_PARTS
#define MAX_OSD_PARTS 5

// Start of OSD symbols in osd_font.pfb
#define OSD_CODEPOINTS 0xE000

// OSD symbols. osd_font.pfb has them starting from codepoint OSD_CODEPOINTS.
// Symbols with a value >= 32 are normal unicode codepoints.
enum mp_osd_font_codepoints {
    OSD_PLAY = 0x01,
    OSD_PAUSE = 0x02,
    OSD_STOP = 0x03,
    OSD_REW = 0x04,
    OSD_FFW = 0x05,
    OSD_CLOCK = 0x06,
    OSD_CONTRAST = 0x07,
    OSD_SATURATION = 0x08,
    OSD_VOLUME = 0x09,
    OSD_BRIGHTNESS = 0x0A,
    OSD_HUE = 0x0B,
    OSD_BALANCE = 0x0C,
    OSD_PANSCAN = 0x50,

    OSD_PB_START = 0x10,
    OSD_PB_0 = 0x11,
    OSD_PB_END = 0x12,
    OSD_PB_1 = 0x13,
};


// Never valid UTF-8, so we expect it's free for use.
// Specially interpreted by osd_libass.c, in order to allow/escape ASS tags.
#define OSD_ASS_0 "\xFD"
#define OSD_ASS_1 "\xFE"

struct osd_style_opts {
    char *font;
    float font_size;
    struct m_color color;
    struct m_color border_color;
    struct m_color shadow_color;
    struct m_color back_color;
    float border_size;
    float shadow_offset;
    float spacing;
    int margin_x;
    int margin_y;
    int align_x;
    int align_y;
    float blur;
    bool bold;
    bool italic;
    int justify;
    int font_provider;
    char *fonts_dir;
};

extern const struct m_sub_options osd_style_conf;
extern const struct m_sub_options sub_style_conf;

struct osd_state;
struct osd_object;
struct mpv_global;
struct dec_sub;

struct osd_state *osd_create(struct mpv_global *global);
void osd_changed(struct osd_state *osd);
void osd_free(struct osd_state *osd);

bool osd_query_and_reset_want_redraw(struct osd_state *osd);

void osd_set_text(struct osd_state *osd, const char *text);
void osd_set_sub(struct osd_state *osd, int index, struct dec_sub *dec_sub);

bool osd_get_render_subs_in_filter(struct osd_state *osd);
void osd_set_render_subs_in_filter(struct osd_state *osd, bool s);
void osd_set_force_video_pts(struct osd_state *osd, double video_pts);
double osd_get_force_video_pts(struct osd_state *osd);

struct osd_progbar_state {
    int type;           // <0: disabled, 1-255: symbol, else: no symbol
    float value;        // range 0.0-1.0
    float *stops;       // used for chapter indicators (0.0-1.0 each)
    int num_stops;
};
void osd_set_progbar(struct osd_state *osd, struct osd_progbar_state *s);

void osd_set_external2(struct osd_state *osd, struct sub_bitmaps *imgs);

enum mp_osd_draw_flags {
    OSD_DRAW_SUB_FILTER = (1 << 0),
    OSD_DRAW_SUB_ONLY   = (1 << 1),
    OSD_DRAW_OSD_ONLY   = (1 << 2),
};

void osd_draw(struct osd_state *osd, struct mp_osd_res res,
              double video_pts, int draw_flags,
              const bool formats[SUBBITMAP_COUNT],
              void (*cb)(void *ctx, struct sub_bitmaps *imgs), void *cb_ctx);

struct sub_bitmap_list *osd_render(struct osd_state *osd, struct mp_osd_res res,
                                   double video_pts, int draw_flags,
                                   const bool formats[SUBBITMAP_COUNT]);

struct mp_image;
void osd_draw_on_image(struct osd_state *osd, struct mp_osd_res res,
                       double video_pts, int draw_flags, struct mp_image *dest);

struct mp_image_pool;
void osd_draw_on_image_p(struct osd_state *osd, struct mp_osd_res res,
                         double video_pts, int draw_flags,
                         struct mp_image_pool *pool, struct mp_image *dest);

void osd_resize(struct osd_state *osd, struct mp_osd_res res);

struct mp_image_params;
struct mp_osd_res osd_res_from_image_params(const struct mp_image_params *p);

struct mp_osd_res osd_get_vo_res(struct osd_state *osd);

void osd_rescale_bitmaps(struct sub_bitmaps *imgs, int frame_w, int frame_h,
                         struct mp_osd_res res, double compensate_par);

struct osd_external_ass {
    void *owner; // unique pointer (NULL is also allowed)
    int64_t id;
    int format;
    char *data;
    int res_x, res_y;
    int z;
    bool hidden;

    double *out_rc; // hack to pass boundary rect, [x0, y0, x1, y1]
};

// defined in osd_libass.c and osd_dummy.c
void osd_set_external(struct osd_state *osd, struct osd_external_ass *ov);
void osd_set_external_remove_owner(struct osd_state *osd, void *owner);
void osd_get_text_size(struct osd_state *osd, int *out_screen_h, int *out_font_h);
void osd_get_function_sym(char *buffer, size_t buffer_size, int osd_function);

#endif /* MPLAYER_SUB_H */
