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/*****************************************************************************
 * display.c: "vout display" managment
 *****************************************************************************
 * Copyright (C) 2009 Laurent Aimar
 * $Id$
 *
 * Authors: Laurent Aimar <fenrir _AT_ videolan _DOT_ org>
 *
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LGPL  
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 * This program 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
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 * (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
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <assert.h>

#include <vlc_common.h>
#include <vlc_video_splitter.h>
#include <vlc_vout_display.h>
#include <vlc_vout.h>
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#include <vlc_block.h>
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#include <vlc_modules.h>
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#include <libvlc.h>

#include "display.h"

#include "event.h"

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/* It must be present as long as a vout_display_t must be created using a dummy
 * vout (as an opengl provider) */
#define ALLOW_DUMMY_VOUT

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static void SplitterClose(vout_display_t *vd);

/*****************************************************************************
 * FIXME/TODO see how to have direct rendering here (interact with vout.c)
 *****************************************************************************/
static picture_t *VideoBufferNew(filter_t *filter)
{
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    vout_display_t *vd = filter->owner.sys;
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    const video_format_t *fmt = &filter->fmt_out.video;

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    assert(vd->fmt.i_chroma == fmt->i_chroma &&
           vd->fmt.i_width  == fmt->i_width  &&
           vd->fmt.i_height == fmt->i_height);

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    picture_pool_t *pool = vout_display_Pool(vd, 3);
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    if (!pool)
        return NULL;
    return picture_pool_Get(pool);
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}
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static void VideoBufferDelete(filter_t *filter, picture_t *picture)
{
    VLC_UNUSED(filter);
    picture_Release(picture);
}

/*****************************************************************************
 *
 *****************************************************************************/

/**
 * It creates a new vout_display_t using the given configuration.
 */
static vout_display_t *vout_display_New(vlc_object_t *obj,
                                        const char *module, bool load_module,
                                        const video_format_t *fmt,
                                        const vout_display_cfg_t *cfg,
                                        vout_display_owner_t *owner)
{
    /* */
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    vout_display_t *vd = vlc_custom_create(obj, sizeof(*vd), "vout display" );
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    /* */
    video_format_Copy(&vd->source, fmt);

    /* Picture buffer does not have the concept of aspect ratio */
    video_format_Copy(&vd->fmt, fmt);
    vd->fmt.i_sar_num = 0;
    vd->fmt.i_sar_den = 0;

    vd->info.is_slow = false;
    vd->info.has_double_click = false;
    vd->info.has_hide_mouse = false;
    vd->info.has_pictures_invalid = false;
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    vd->info.has_event_thread = false;
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    vd->info.subpicture_chromas = NULL;
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    vd->cfg = cfg;
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    vd->pool = NULL;
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    vd->prepare = NULL;
    vd->display = NULL;
    vd->control = NULL;
    vd->manage = NULL;
    vd->sys = NULL;

    vd->owner = *owner;

    if (load_module) {
        vd->module = module_need(vd, "vout display", module, module && *module != '\0');
        if (!vd->module) {
            vlc_object_release(vd);
            return NULL;
        }
    } else {
        vd->module = NULL;
    }
    return vd;
}

/**
 * It deletes a vout_display_t
 */
static void vout_display_Delete(vout_display_t *vd)
{
    if (vd->module)
        module_unneed(vd, vd->module);

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    video_format_Clean(&vd->source);
    video_format_Clean(&vd->fmt);

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    vlc_object_release(vd);
}

/**
 * It controls a vout_display_t
 */
static int vout_display_Control(vout_display_t *vd, int query, ...)
{
    va_list args;
    int result;

    va_start(args, query);
    result = vd->control(vd, query, args);
    va_end(args);

    return result;
}
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static void vout_display_Manage(vout_display_t *vd)
{
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    if (vd->manage)
        vd->manage(vd);
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}

/* */
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void vout_display_GetDefaultDisplaySize(unsigned *width, unsigned *height,
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                                        const video_format_t *source,
                                        const vout_display_cfg_t *cfg)
{
    if (cfg->display.width > 0 && cfg->display.height > 0) {
        *width  = cfg->display.width;
        *height = cfg->display.height;
    } else if (cfg->display.width > 0) {
        *width  = cfg->display.width;
        *height = (int64_t)source->i_visible_height * source->i_sar_den * cfg->display.width * cfg->display.sar.num /
            source->i_visible_width / source->i_sar_num / cfg->display.sar.den;
    } else if (cfg->display.height > 0) {
        *width  = (int64_t)source->i_visible_width * source->i_sar_num * cfg->display.height * cfg->display.sar.den /
            source->i_visible_height / source->i_sar_den / cfg->display.sar.num;
        *height = cfg->display.height;
    } else if (source->i_sar_num >= source->i_sar_den) {
        *width  = (int64_t)source->i_visible_width * source->i_sar_num * cfg->display.sar.den / source->i_sar_den / cfg->display.sar.num;
        *height = source->i_visible_height;
    } else {
        *width  = source->i_visible_width;
        *height = (int64_t)source->i_visible_height * source->i_sar_den * cfg->display.sar.num / source->i_sar_num / cfg->display.sar.den;
    }

    *width  = *width  * cfg->zoom.num / cfg->zoom.den;
    *height = *height * cfg->zoom.num / cfg->zoom.den;
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    if (ORIENT_IS_SWAP(source->orientation)) {

        unsigned store = *width;
        *width = *height;
        *height = store;
    }
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}

/* */
void vout_display_PlacePicture(vout_display_place_t *place,
                               const video_format_t *source,
                               const vout_display_cfg_t *cfg,
                               bool do_clipping)
{
    /* */
    memset(place, 0, sizeof(*place));
    if (cfg->display.width <= 0 || cfg->display.height <= 0)
        return;

    /* */
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    unsigned display_width;
    unsigned display_height;
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    video_format_t source_rot;
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    video_format_ApplyRotation(&source_rot, source);
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    source = &source_rot;

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    if (cfg->is_display_filled) {
        display_width  = cfg->display.width;
        display_height = cfg->display.height;
    } else {
        vout_display_cfg_t cfg_tmp = *cfg;

        cfg_tmp.display.width  = 0;
        cfg_tmp.display.height = 0;
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        vout_display_GetDefaultDisplaySize(&display_width, &display_height,
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                                           source, &cfg_tmp);

        if (do_clipping) {
            display_width  = __MIN(display_width,  cfg->display.width);
            display_height = __MIN(display_height, cfg->display.height);
        }
    }

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    const unsigned width  = source->i_visible_width;
    const unsigned height = source->i_visible_height;
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    /* Compute the height if we use the width to fill up display_width */
    const int64_t scaled_height = (int64_t)height * display_width  * cfg->display.sar.num * source->i_sar_den / width  / source->i_sar_num / cfg->display.sar.den;
    /* And the same but switching width/height */
    const int64_t scaled_width  = (int64_t)width  * display_height * cfg->display.sar.den * source->i_sar_num / height / source->i_sar_den / cfg->display.sar.num;

    /* We keep the solution that avoid filling outside the display */
    if (scaled_width <= cfg->display.width) {
        place->width  = scaled_width;
        place->height = display_height;
    } else {
        place->width  = display_width;
        place->height = scaled_height;
    }

    /*  Compute position */
    switch (cfg->align.horizontal) {
    case VOUT_DISPLAY_ALIGN_LEFT:
        place->x = 0;
        break;
    case VOUT_DISPLAY_ALIGN_RIGHT:
        place->x = cfg->display.width - place->width;
        break;
    default:
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        place->x = ((int)cfg->display.width - (int)place->width) / 2;
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        break;
    }

    switch (cfg->align.vertical) {
    case VOUT_DISPLAY_ALIGN_TOP:
        place->y = 0;
        break;
    case VOUT_DISPLAY_ALIGN_BOTTOM:
        place->y = cfg->display.height - place->height;
        break;
    default:
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        place->y = ((int)cfg->display.height - (int)place->height) / 2;
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        break;
    }
}

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void vout_display_SendMouseMovedDisplayCoordinates(vout_display_t *vd, video_orientation_t orient_display, int m_x, int m_y, vout_display_place_t *place)
{
    video_format_t source_rot = vd->source;
    video_format_TransformTo(&source_rot, orient_display);

    if (place->width > 0 && place->height > 0) {

        int x = (int)(source_rot.i_x_offset +
                            (int64_t)(m_x - place->x) * source_rot.i_visible_width / place->width);
        int y = (int)(source_rot.i_y_offset +
                            (int64_t)(m_y - place->y) * source_rot.i_visible_height/ place->height);

        video_transform_t transform = video_format_GetTransform(vd->source.orientation, orient_display);

        int store;

        switch (transform) {

            case TRANSFORM_R90:
                store = x;
                x = y;
                y = vd->source.i_visible_height - store;
                break;
            case TRANSFORM_R180:
                x = vd->source.i_visible_width - x;
                y = vd->source.i_visible_height - y;
                break;
            case TRANSFORM_R270:
                store = x;
                x = vd->source.i_visible_width - y;
                y = store;
                break;
            case TRANSFORM_HFLIP:
                x = vd->source.i_visible_width - x;
                break;
            case TRANSFORM_VFLIP:
                y = vd->source.i_visible_height - y;
                break;
            case TRANSFORM_TRANSPOSE:
                store = x;
                x = y;
                y = store;
                break;
            case TRANSFORM_ANTI_TRANSPOSE:
                store = x;
                x = vd->source.i_visible_width - y;
                y = vd->source.i_visible_height - store;
                break;
            default:
                break;
        }

        vout_display_SendEventMouseMoved (vd, x, y);
    }
}

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struct vout_display_owner_sys_t {
    vout_thread_t   *vout;
    bool            is_wrapper;  /* Is the current display a wrapper */
    vout_display_t  *wrapper; /* Vout display wrapper */

    /* */
    vout_display_cfg_t cfg;
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    unsigned     wm_state_initial;
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    struct {
        unsigned num;
        unsigned den;
    } sar_initial;

    /* */
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    unsigned width_saved;
    unsigned height_saved;
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    struct {
        unsigned num;
        unsigned den;
    } crop_saved;

    /* */
    bool ch_display_filled;
    bool is_display_filled;

    bool ch_zoom;
    struct {
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        unsigned num;
        unsigned den;
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    } zoom;

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    bool ch_wm_state;
    unsigned wm_state;
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    bool ch_sar;
    struct {
        unsigned num;
        unsigned den;
    } sar;

    bool ch_crop;
    struct {
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        int      left;
        int      top;
        int      right;
        int      bottom;
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        unsigned num;
        unsigned den;
    } crop;

    /* */
    video_format_t source;
    filter_chain_t *filters;
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    /* Lock protecting the variables used by
     * VoutDisplayEvent(ie vout_display_SendEvent) */
    vlc_mutex_t lock;

    /* mouse state */
    struct {
        vlc_mouse_t state;

        mtime_t last_pressed;
        mtime_t last_moved;
        bool    is_hidden;
        bool    ch_activity;

        /* */
        mtime_t double_click_timeout;
        mtime_t hide_timeout;
    } mouse;

    bool reset_pictures;

    bool ch_fullscreen;
    bool is_fullscreen;

    bool ch_display_size;
    int  display_width;
    int  display_height;
    bool display_is_fullscreen;
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    bool display_is_forced;
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    int  fit_window;

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    struct {
        vlc_thread_t thread;
        block_fifo_t *fifo;
    } event;

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#ifdef ALLOW_DUMMY_VOUT
    vlc_mouse_t vout_mouse;
#endif
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};

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static void DummyVoutSendDisplayEventMouse(vout_thread_t *, vlc_mouse_t *fallback, const vlc_mouse_t *m);

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static void VoutDisplayCreateRender(vout_display_t *vd)
{
    vout_display_owner_sys_t *osys = vd->owner.sys;

    osys->filters = NULL;

    video_format_t v_src = vd->source;
    v_src.i_sar_num = 0;
    v_src.i_sar_den = 0;

    video_format_t v_dst = vd->fmt;
    v_dst.i_sar_num = 0;
    v_dst.i_sar_den = 0;

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    video_format_t v_dst_cmp = v_dst;
    if ((v_src.i_chroma == VLC_CODEC_J420 && v_dst.i_chroma == VLC_CODEC_I420) ||
        (v_src.i_chroma == VLC_CODEC_J422 && v_dst.i_chroma == VLC_CODEC_I422) ||
        (v_src.i_chroma == VLC_CODEC_J440 && v_dst.i_chroma == VLC_CODEC_I440) ||
        (v_src.i_chroma == VLC_CODEC_J444 && v_dst.i_chroma == VLC_CODEC_I444))
        v_dst_cmp.i_chroma = v_src.i_chroma;

    const bool convert = memcmp(&v_src, &v_dst_cmp, sizeof(v_src)) != 0;
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    if (!convert)
        return;

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    msg_Dbg(vd, "A filter to adapt decoder to display is needed");
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    filter_owner_t owner = {
        .sys = vd,
        .video = {
            .buffer_new = VideoBufferNew,
            .buffer_del = VideoBufferDelete,
        },
    };

    osys->filters = filter_chain_NewVideo(vd, false, &owner);
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    assert(osys->filters); /* TODO critical */

    /* */
    es_format_t src;
    es_format_InitFromVideo(&src, &v_src);

    /* */
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    filter_t *filter;
    for (int i = 0; i < 1 + (v_dst_cmp.i_chroma != v_dst.i_chroma); i++) {
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        es_format_t dst;
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        es_format_InitFromVideo(&dst, i == 0 ? &v_dst : &v_dst_cmp);

        filter_chain_Reset(osys->filters, &src, &dst);
        filter = filter_chain_AppendFilter(osys->filters,
                                           NULL, NULL, &src, &dst);
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        es_format_Clean(&dst);
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        if (filter)
            break;
    }
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    es_format_Clean(&src);
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    if (!filter)
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        msg_Err(vd, "Failed to adapt decoder format to display");
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}

static void VoutDisplayDestroyRender(vout_display_t *vd)
{
    vout_display_owner_sys_t *osys = vd->owner.sys;

    if (osys->filters)
        filter_chain_Delete(osys->filters);
}

static void VoutDisplayResetRender(vout_display_t *vd)
{
    VoutDisplayDestroyRender(vd);
    VoutDisplayCreateRender(vd);
}
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static void VoutDisplayEventMouse(vout_display_t *vd, int event, va_list args)
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{
    vout_display_owner_sys_t *osys = vd->owner.sys;

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    vlc_mutex_lock(&osys->lock);

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    /* */
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    vlc_mouse_t m = osys->mouse.state;
    bool is_ignored = false;
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    switch (event) {
    case VOUT_DISPLAY_EVENT_MOUSE_STATE: {
        const int x = (int)va_arg(args, int);
        const int y = (int)va_arg(args, int);
        const int button_mask = (int)va_arg(args, int);

        vlc_mouse_Init(&m);
        m.i_x = x;
        m.i_y = y;
        m.i_pressed = button_mask;
        break;
    }
    case VOUT_DISPLAY_EVENT_MOUSE_MOVED: {
        const int x = (int)va_arg(args, int);
        const int y = (int)va_arg(args, int);

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        //msg_Dbg(vd, "VoutDisplayEvent 'mouse' @%d,%d", x, y);

        m.i_x = x;
        m.i_y = y;
        m.b_double_click = false;
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        break;
    }
    case VOUT_DISPLAY_EVENT_MOUSE_PRESSED:
    case VOUT_DISPLAY_EVENT_MOUSE_RELEASED: {
        const int button = (int)va_arg(args, int);
        const int button_mask = 1 << button;

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        /* Ignore inconsistent event */
        if ((event == VOUT_DISPLAY_EVENT_MOUSE_PRESSED  &&  (osys->mouse.state.i_pressed & button_mask)) ||
            (event == VOUT_DISPLAY_EVENT_MOUSE_RELEASED && !(osys->mouse.state.i_pressed & button_mask))) {
            is_ignored = true;
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            break;
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        }
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        /* */
        msg_Dbg(vd, "VoutDisplayEvent 'mouse button' %d t=%d", button, event);

        m.b_double_click = false;
        if (event == VOUT_DISPLAY_EVENT_MOUSE_PRESSED)
            m.i_pressed |= button_mask;
        else
            m.i_pressed &= ~button_mask;
        break;
    }
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    case VOUT_DISPLAY_EVENT_MOUSE_DOUBLE_CLICK:
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        msg_Dbg(vd, "VoutDisplayEvent 'double click'");

        m.b_double_click = true;
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        break;
    default:
        assert(0);
    }

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    if (is_ignored) {
        vlc_mutex_unlock(&osys->lock);
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        return;
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    }
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    /* Emulate double-click if needed */
    if (!vd->info.has_double_click &&
        vlc_mouse_HasPressed(&osys->mouse.state, &m, MOUSE_BUTTON_LEFT)) {
        const mtime_t i_date = mdate();

        if (i_date - osys->mouse.last_pressed < osys->mouse.double_click_timeout ) {
            m.b_double_click = true;
            osys->mouse.last_pressed = 0;
        } else {
            osys->mouse.last_pressed = mdate();
        }
    }

    /* */
    osys->mouse.state = m;

    /* */
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    osys->mouse.ch_activity = true;
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    if (!vd->info.has_hide_mouse)
        osys->mouse.last_moved = mdate();

    /* */
    vout_SendEventMouseVisible(osys->vout);
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#ifdef ALLOW_DUMMY_VOUT
    DummyVoutSendDisplayEventMouse(osys->vout, &osys->vout_mouse, &m);
#else
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    vout_SendDisplayEventMouse(osys->vout, &m);
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#endif
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    vlc_mutex_unlock(&osys->lock);
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}

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VLC_NORETURN
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static void *VoutDisplayEventKeyDispatch(void *data)
{
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    vout_display_owner_sys_t *osys = data;
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    for (;;) {
        block_t *event = block_FifoGet(osys->event.fifo);
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        int cancel = vlc_savecancel();
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        int key;
        memcpy(&key, event->p_buffer, sizeof(key));
        vout_SendEventKey(osys->vout, key);
        block_Release(event);
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        vlc_restorecancel(cancel);
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    }
}

static void VoutDisplayEventKey(vout_display_t *vd, int key)
{
    vout_display_owner_sys_t *osys = vd->owner.sys;

    if (!osys->event.fifo) {
        osys->event.fifo = block_FifoNew();
        if (!osys->event.fifo)
            return;
        if (vlc_clone(&osys->event.thread, VoutDisplayEventKeyDispatch,
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                      osys, VLC_THREAD_PRIORITY_LOW)) {
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            block_FifoRelease(osys->event.fifo);
            osys->event.fifo = NULL;
            return;
        }
    }
    block_t *event = block_Alloc(sizeof(key));
    if (event) {
        memcpy(event->p_buffer, &key, sizeof(key));
        block_FifoPut(osys->event.fifo, event);
    }
}

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static void VoutDisplayEvent(vout_display_t *vd, int event, va_list args)
{
    vout_display_owner_sys_t *osys = vd->owner.sys;

    switch (event) {
    case VOUT_DISPLAY_EVENT_CLOSE: {
        msg_Dbg(vd, "VoutDisplayEvent 'close'");
        vout_SendEventClose(osys->vout);
        break;
    }
    case VOUT_DISPLAY_EVENT_KEY: {
        const int key = (int)va_arg(args, int);
        msg_Dbg(vd, "VoutDisplayEvent 'key' 0x%2.2x", key);
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        if (vd->info.has_event_thread)
            vout_SendEventKey(osys->vout, key);
        else
            VoutDisplayEventKey(vd, key);
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        break;
    }
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    case VOUT_DISPLAY_EVENT_MOUSE_STATE:
    case VOUT_DISPLAY_EVENT_MOUSE_MOVED:
    case VOUT_DISPLAY_EVENT_MOUSE_PRESSED:
    case VOUT_DISPLAY_EVENT_MOUSE_RELEASED:
    case VOUT_DISPLAY_EVENT_MOUSE_DOUBLE_CLICK:
        VoutDisplayEventMouse(vd, event, args);
        break;
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    case VOUT_DISPLAY_EVENT_FULLSCREEN: {
        const int is_fullscreen = (int)va_arg(args, int);

        msg_Dbg(vd, "VoutDisplayEvent 'fullscreen' %d", is_fullscreen);

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        vlc_mutex_lock(&osys->lock);
        if (!is_fullscreen != !osys->is_fullscreen) {
            osys->ch_fullscreen = true;
            osys->is_fullscreen = is_fullscreen;
        }
        vlc_mutex_unlock(&osys->lock);
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        break;
    }

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    case VOUT_DISPLAY_EVENT_WINDOW_STATE: {
        const unsigned state = va_arg(args, unsigned);
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        msg_Dbg(vd, "VoutDisplayEvent 'window state' %u", state);
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        vlc_mutex_lock(&osys->lock);
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        if (state != osys->wm_state) {
            osys->ch_wm_state = true;
            osys->wm_state = state;
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        }
        vlc_mutex_unlock(&osys->lock);
        break;
    }

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    case VOUT_DISPLAY_EVENT_DISPLAY_SIZE: {
        const int width  = (int)va_arg(args, int);
        const int height = (int)va_arg(args, int);
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        const bool is_fullscreen = (bool)va_arg(args, int);
        msg_Dbg(vd, "VoutDisplayEvent 'resize' %dx%d %s",
                width, height, is_fullscreen ? "fullscreen" : "window");
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        /* */
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        vlc_mutex_lock(&osys->lock);

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        osys->ch_display_size       = true;
        osys->display_width         = width;
        osys->display_height        = height;
        osys->display_is_fullscreen = is_fullscreen;
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        osys->display_is_forced     = false;
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        vlc_mutex_unlock(&osys->lock);
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        break;
    }

    case VOUT_DISPLAY_EVENT_PICTURES_INVALID: {
        msg_Warn(vd, "VoutDisplayEvent 'pictures invalid'");

        /* */
        assert(vd->info.has_pictures_invalid);
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        vlc_mutex_lock(&osys->lock);
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        osys->reset_pictures = true;
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        vlc_mutex_unlock(&osys->lock);
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        break;
    }
    default:
        msg_Err(vd, "VoutDisplayEvent received event %d", event);
        /* TODO add an assert when all event are handled */
        break;
    }
}

static vout_window_t *VoutDisplayNewWindow(vout_display_t *vd, const vout_window_cfg_t *cfg)
{
    vout_display_owner_sys_t *osys = vd->owner.sys;

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#ifdef ALLOW_DUMMY_VOUT
    if (!osys->vout->p) {
        vout_window_cfg_t cfg_override = *cfg;

        if (!var_InheritBool(osys->vout, "embedded-video"))
            cfg_override.is_standalone = true;

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        return vout_window_New(VLC_OBJECT(osys->vout), "$window",
                               &cfg_override, NULL);
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    }
#endif
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    return vout_NewDisplayWindow(osys->vout, cfg);
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}
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static void VoutDisplayDelWindow(vout_display_t *vd, vout_window_t *window)
{
    vout_display_owner_sys_t *osys = vd->owner.sys;

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#ifdef ALLOW_DUMMY_VOUT
    if (!osys->vout->p) {
        if( window)
            vout_window_Delete(window);
        return;
    }
#endif
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    vout_DeleteDisplayWindow(osys->vout, window);
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}

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static void VoutDisplayFitWindow(vout_display_t *vd, bool default_size)
{
    vout_display_owner_sys_t *osys = vd->owner.sys;
    vout_display_cfg_t cfg = osys->cfg;

    if (!cfg.is_display_filled)
        return;

    cfg.display.width = 0;
    if (default_size) {
        cfg.display.height = 0;
    } else {
        cfg.display.height = osys->height_saved;
        cfg.zoom.num = 1;
        cfg.zoom.den = 1;
    }

    unsigned display_width;
    unsigned display_height;
    vout_display_GetDefaultDisplaySize(&display_width, &display_height,
                                       &vd->source, &cfg);

    vlc_mutex_lock(&osys->lock);

    osys->ch_display_size       = true;
    osys->display_width         = display_width;
    osys->display_height        = display_height;
    osys->display_is_fullscreen = osys->cfg.is_fullscreen;
    osys->display_is_forced     = true;

    vlc_mutex_unlock(&osys->lock);
}

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static void VoutDisplayCropRatio(int *left, int *top, int *right, int *bottom,
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                                 const video_format_t *source,
                                 unsigned num, unsigned den)
{
    unsigned scaled_width  = (uint64_t)source->i_visible_height * num * source->i_sar_den / den / source->i_sar_num;
    unsigned scaled_height = (uint64_t)source->i_visible_width  * den * source->i_sar_num / num / source->i_sar_den;

    if (scaled_width < source->i_visible_width) {
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        *left   = (source->i_visible_width - scaled_width) / 2;
        *top    = 0;
        *right  = *left + scaled_width;
        *bottom = *top  + source->i_visible_height;
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    } else {
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        *left   = 0;
        *top    = (source->i_visible_height - scaled_height) / 2;
        *right  = *left + source->i_visible_width;
        *bottom = *top  + scaled_height;
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    }
}

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bool vout_ManageDisplay(vout_display_t *vd, bool allow_reset_pictures)
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{
    vout_display_owner_sys_t *osys = vd->owner.sys;

    vout_display_Manage(vd);

    /* Handle mouse timeout */
    const mtime_t date = mdate();
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    bool  hide_mouse = false;

    vlc_mutex_lock(&osys->lock);

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    if (!osys->mouse.is_hidden &&
        osys->mouse.last_moved + osys->mouse.hide_timeout < date) {
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        osys->mouse.is_hidden = hide_mouse = true;
    } else if (osys->mouse.ch_activity) {
        osys->mouse.is_hidden = false;
    }
    osys->mouse.ch_activity = false;
    vlc_mutex_unlock(&osys->lock);

    if (hide_mouse) {
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        if (!vd->info.has_hide_mouse) {
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            msg_Dbg(vd, "auto hiding mouse cursor");
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            vout_display_Control(vd, VOUT_DISPLAY_HIDE_MOUSE);
        }
        vout_SendEventMouseHidden(osys->vout);
    }

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    bool reset_render = false;
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    for (;;) {
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        vlc_mutex_lock(&osys->lock);

        bool ch_fullscreen  = osys->ch_fullscreen;
        bool is_fullscreen  = osys->is_fullscreen;
        osys->ch_fullscreen = false;

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        bool ch_wm_state  = osys->ch_wm_state;
        unsigned wm_state  = osys->wm_state;
        osys->ch_wm_state = false;
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        bool ch_display_size       = osys->ch_display_size;
        int  display_width         = osys->display_width;
        int  display_height        = osys->display_height;
        bool display_is_fullscreen = osys->display_is_fullscreen;
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        bool display_is_forced     = osys->display_is_forced;
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        osys->ch_display_size = false;

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        bool reset_pictures;
        if (allow_reset_pictures) {
            reset_pictures = osys->reset_pictures;
            osys->reset_pictures = false;
        } else {
            reset_pictures = false;
        }
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        vlc_mutex_unlock(&osys->lock);

        if (!ch_fullscreen &&
            !ch_display_size &&
            !reset_pictures &&
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            !osys->ch_display_filled &&
            !osys->ch_zoom &&
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            !ch_wm_state &&
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            !osys->ch_sar &&
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            !osys->ch_crop) {

            if (!osys->cfg.is_fullscreen && osys->fit_window != 0) {
                VoutDisplayFitWindow(vd, osys->fit_window == -1);
                osys->fit_window = 0;
                continue;
            }
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            break;
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        }
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        /* */
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        if (ch_fullscreen) {
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            vout_display_cfg_t cfg = osys->cfg;

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            cfg.is_fullscreen  = is_fullscreen;
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            cfg.display.width  = cfg.is_fullscreen ? 0 : osys->width_saved;
            cfg.display.height = cfg.is_fullscreen ? 0 : osys->height_saved;

            if (vout_display_Control(vd, VOUT_DISPLAY_CHANGE_FULLSCREEN, &cfg)) {
                msg_Err(vd, "Failed to set fullscreen");
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                is_fullscreen = osys->cfg.is_fullscreen;
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            } else if (!is_fullscreen) {
                vout_display_Control(vd, VOUT_DISPLAY_CHANGE_DISPLAY_SIZE, &cfg, true);
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            }
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            osys->cfg.is_fullscreen = is_fullscreen;
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            /* */
            vout_SendEventFullscreen(osys->vout, osys->cfg.is_fullscreen);
        }

        /* */
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        if (ch_display_size) {
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            vout_display_cfg_t cfg = osys->cfg;
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            cfg.display.width  = display_width;
            cfg.display.height = display_height;
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            if (!cfg.is_fullscreen != !display_is_fullscreen ||
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                vout_display_Control(vd, VOUT_DISPLAY_CHANGE_DISPLAY_SIZE, &cfg, display_is_forced)) {
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                if (!display_is_forced)
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                    msg_Err(vd, "Failed to resize display");
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                /* We ignore the resized */
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                display_width  = osys->cfg.display.width;
                display_height = osys->cfg.display.height;
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            }
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            osys->cfg.display.width  = display_width;
            osys->cfg.display.height = display_height;
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            if (!display_is_fullscreen) {
                osys->width_saved  = display_width;
                osys->height_saved = display_height;
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            }
        }
        /* */
        if (osys->ch_display_filled) {
            vout_display_cfg_t cfg = osys->cfg;

            cfg.is_display_filled = osys->is_display_filled;

            if (vout_display_Control(vd, VOUT_DISPLAY_CHANGE_DISPLAY_FILLED, &cfg)) {
                msg_Err(vd, "Failed to change display filled state");
                osys->is_display_filled = osys->cfg.is_display_filled;
            }
            osys->cfg.is_display_filled = osys->is_display_filled;
            osys->ch_display_filled = false;

            vout_SendEventDisplayFilled(osys->vout, osys->cfg.is_display_filled);
        }
        /* */
        if (osys->ch_zoom) {
            vout_display_cfg_t cfg = osys->cfg;

            cfg.zoom.num = osys->zoom.num;
            cfg.zoom.den = osys->zoom.den;

            if (10 * cfg.zoom.num <= cfg.zoom.den) {
                cfg.zoom.num = 1;
                cfg.zoom.den = 10;
            } else if (cfg.zoom.num >= 10 * cfg.zoom.den) {
                cfg.zoom.num = 10;
                cfg.zoom.den = 1;
            }

            if (vout_display_Control(vd, VOUT_DISPLAY_CHANGE_ZOOM, &cfg)) {
                msg_Err(vd, "Failed to change zoom");
                osys->zoom.num = osys->cfg.zoom.num;
                osys->zoom.den = osys->cfg.zoom.den;
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            } else {
                osys->fit_window = -1;
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            }

            osys->cfg.zoom.num = osys->zoom.num;
            osys->cfg.zoom.den = osys->zoom.den;
            osys->ch_zoom = false;

            vout_SendEventZoom(osys->vout, osys->cfg.zoom.num, osys->cfg.zoom.den);
        }
        /* */
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        if (ch_wm_state) {
            if (vout_display_Control(vd, VOUT_DISPLAY_CHANGE_WINDOW_STATE, wm_state)) {
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                msg_Err(vd, "Failed to set on top");
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                wm_state = osys->wm_state;
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            }
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            osys->wm_state_initial = wm_state;
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            /* */
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            vout_SendEventOnTop(osys->vout, osys->wm_state_initial);
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        }
        /* */
        if (osys->ch_sar) {
            video_format_t source = vd->source;

            if (osys->sar.num > 0 && osys->sar.den > 0) {
                source.i_sar_num = osys->sar.num;
                source.i_sar_den = osys->sar.den;
            } else {
                source.i_sar_num = osys->source.i_sar_num;
                source.i_sar_den = osys->source.i_sar_den;
            }

            if (vout_display_Control(vd, VOUT_DISPLAY_CHANGE_SOURCE_ASPECT, &source)) {
                /* There nothing much we can do. The only reason a vout display
                 * does not support it is because it need the core to add black border
                 * to the video for it.
                 * TODO add black borders ?
                 */
                msg_Err(vd, "Failed to change source AR");
                source = vd->source;
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            } else if (!osys->fit_window) {
                osys->fit_window = 1;
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            }
            vd->source = source;
            osys->sar.num = source.i_sar_num;
            osys->sar.den = source.i_sar_den;
            osys->ch_sar  = false;

            /* */
            if (osys->sar.num == osys->source.i_sar_num &&
                osys->sar.den == osys->source.i_sar_den)
            {
                vout_SendEventSourceAspect(osys->vout, 0, 0);
            }
            else
            {
                unsigned dar_num, dar_den;
                vlc_ureduce( &dar_num, &dar_den,
                             osys->sar.num * vd->source.i_visible_width,
                             osys->sar.den * vd->source.i_visible_height,
                             65536);
                vout_SendEventSourceAspect(osys->vout, dar_num, dar_den);
            }
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            /* If a crop ratio is requested, recompute the parameters */
            if (osys->crop.num > 0 && osys->crop.den > 0)
                osys->ch_crop = true;
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        }
        /* */
        if (osys->ch_crop) {
            video_format_t source = vd->source;
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            unsigned crop_num = osys->crop.num;
            unsigned crop_den = osys->crop.den;
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            if (crop_num > 0 && crop_den > 0) {
                video_format_t fmt = osys->source;
                fmt.i_sar_num = source.i_sar_num;
                fmt.i_sar_den = source.i_sar_den;
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                VoutDisplayCropRatio(&osys->crop.left,  &osys->crop.top,
                                     &osys->crop.right, &osys->crop.bottom,
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                                     &fmt, crop_num, crop_den);
            }
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            const int right_max  = osys->source.i_x_offset + osys->source.i_visible_width;
            const int bottom_max = osys->source.i_y_offset + osys->source.i_visible_height;
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            int left   = VLC_CLIP((int)osys->source.i_x_offset + osys->crop.left,
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                                0, right_max - 1);
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            int top    = VLC_CLIP((int)osys->source.i_y_offset + osys->crop.top,
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                                0, bottom_max - 1);
            int right, bottom;
            if (osys->crop.right <= 0)
                right = (int)(osys->source.i_x_offset + osys->source.i_visible_width) + osys->crop.right;
            else
                right = (int)osys->source.i_x_offset + osys->crop.right;
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            right = VLC_CLIP(right, left + 1, right_max);
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            if (osys->crop.bottom <= 0)
                bottom = (int)(osys->source.i_y_offset + osys->source.i_visible_height) + osys->crop.bottom;
            else
                bottom = (int)osys->source.i_y_offset + osys->crop.bottom;
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            bottom = VLC_CLIP(bottom, top + 1, bottom_max);
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            source.i_x_offset       = left;
            source.i_y_offset       = top;
            source.i_visible_width  = right - left;
            source.i_visible_height = bottom - top;
            video_format_Print(VLC_OBJECT(vd), "SOURCE ", &osys->source);
            video_format_Print(VLC_OBJECT(vd), "CROPPED", &source);
            if (vout_display_Control(vd, VOUT_DISPLAY_CHANGE_SOURCE_CROP, &source)) {
                msg_Err(vd, "Failed to change source crop TODO implement crop at core");
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                source = vd->source;
                crop_num = osys->crop_saved.num;
                crop_den = osys->crop_saved.den;
                /* FIXME implement cropping in the core if not supported by the
                 * vout module (easy)
                 */
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            } else if (!osys->fit_window) {
                osys->fit_window = 1;
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            }
            vd->source = source;
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            osys->crop.left   = source.i_x_offset - osys->source.i_x_offset;
            osys->crop.top    = source.i_y_offset - osys->source.i_y_offset;
            /* FIXME for right/bottom we should keep the 'type' border vs window */
            osys->crop.right  = (source.i_x_offset + source.i_visible_width) -
                                (osys->source.i_x_offset + osys->source.i_visible_width);
            osys->crop.bottom = (source.i_y_offset + source.i_visible_height) -
                                (osys->source.i_y_offset + osys->source.i_visible_height);
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            osys->crop.num    = crop_num;
            osys->crop.den    = crop_den;
            osys->ch_crop = false;

            vout_SendEventSourceCrop(osys->vout,
                                     osys->crop.num, osys->crop.den,
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                                     osys->crop.left, osys->crop.top,
                                     -osys->crop.right, -osys->crop.bottom);
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        }

        /* */
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        if (reset_pictures) {
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            if (vout_display_Control(vd, VOUT_DISPLAY_RESET_PICTURES)) {
                /* FIXME what to do here ? */
                msg_Err(vd, "Failed to reset pictures (probably fatal)");
            }
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            reset_render = true;
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        }
    }
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    if (reset_render)
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        VoutDisplayResetRender(vd);
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    return reset_render;
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}

bool vout_AreDisplayPicturesInvalid(vout_display_t *vd)
{
    vout_display_owner_sys_t *osys = vd->owner.sys;

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    vlc_mutex_lock(&osys->lock);
    const bool reset_pictures = osys->reset_pictures;
    vlc_mutex_unlock(&osys->lock);

    return reset_pictures;
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}

bool vout_IsDisplayFiltered(vout_display_t *vd)
{
    vout_display_owner_sys_t *osys = vd->owner.sys;

    return osys->filters != NULL;
}

picture_t *vout_FilterDisplay(vout_display_t *vd, picture_t *picture)
{
    vout_display_owner_sys_t *osys = vd->owner.sys;

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    assert(osys->filters);
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    if (filter_chain_GetLength(osys->filters) <= 0) {
        picture_Release(picture);
        return NULL;
    }
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    return filter_chain_VideoFilter(osys->filters, picture);
}

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void vout_UpdateDisplaySourceProperties(vout_display_t *vd, const video_format_t *source)
{
    vout_display_owner_sys_t *osys = vd->owner.sys;

    if (source->i_sar_num * osys->source.i_sar_den !=
        source->i_sar_den * osys->source.i_sar_num) {

        osys->source.i_sar_num = source->i_sar_num;
        osys->source.i_sar_den = source->i_sar_den;
        vlc_ureduce(&osys->source.i_sar_num, &osys->source.i_sar_den,
                    osys->source.i_sar_num, osys->source.i_sar_den, 0);

        /* FIXME it will override any AR that the user would have forced */
        osys->ch_sar = true;
        osys->sar.num = osys->source.i_sar_num;
        osys->sar.den = osys->source.i_sar_den;
    }
    if (source->i_x_offset       != osys->source.i_x_offset ||
        source->i_y_offset       != osys->source.i_y_offset ||
        source->i_visible_width  != osys->source.i_visible_width ||
        source->i_visible_height != osys->source.i_visible_height) {

        video_format_CopyCrop(&osys->source, source);

        /* Force the vout to reapply the current user crop settings over the new decoder
         * crop settings. */
        osys->ch_crop = true;
    }
}

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void vout_SetDisplayFullscreen(vout_display_t *vd, bool is_fullscreen)
{
    vout_display_owner_sys_t *osys = vd->owner.sys;

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    vlc_mutex_lock(&osys->lock);
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    if (!osys->is_fullscreen != !is_fullscreen) {
        osys->ch_fullscreen = true;
        osys->is_fullscreen = is_fullscreen;
    }
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    vlc_mutex_unlock(&osys->lock);
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}

void vout_SetDisplayFilled(vout_display_t *vd, bool is_filled)
{
    vout_display_owner_sys_t *osys = vd->owner.sys;

    if (!osys->is_display_filled != !is_filled) {
        osys->ch_display_filled = true;
        osys->is_display_filled = is_filled;
    }
}

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void vout_SetDisplayZoom(vout_display_t *vd, unsigned num, unsigned den)
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{
    vout_display_owner_sys_t *osys = vd->owner.sys;

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    if (num > 0 && den > 0) {
        vlc_ureduce(&num, &den, num, den, 0);
    } else {
        num = 1;
        den = 1;
    }

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    if (osys->is_display_filled ||
        osys->zoom.num != num || osys->zoom.den != den) {
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        osys->ch_zoom = true;
        osys->zoom.num = num;
        osys->zoom.den = den;
    }
}
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void vout_SetWindowState(vout_display_t *vd, unsigned state)
1229 1230 1231
{
    vout_display_owner_sys_t *osys = vd->owner.sys;

1232
    vlc_mutex_lock(&osys->lock);
1233 1234 1235
    if (osys->wm_state != state) {
        osys->ch_wm_state = true;
        osys->wm_state = state;
1236
    }
1237
    vlc_mutex_unlock(&osys->lock);
1238
}
1239

1240
void vout_SetDisplayAspect(vout_display_t *vd, unsigned dar_num, unsigned dar_den)
1241 1242 1243
{
    vout_display_owner_sys_t *osys = vd->owner.sys;

1244 1245 1246 1247 1248 1249
    unsigned sar_num, sar_den;
    if (dar_num > 0 && dar_den > 0) {
        sar_num = dar_num * osys->source.i_visible_height;
        sar_den = dar_den * osys->source.i_visible_width;
        vlc_ureduce(&sar_num, &sar_den, sar_num, sar_den, 0);
    } else {
1250 1251
        sar_num = 0;
        sar_den = 0;
1252 1253
    }

1254 1255 1256 1257 1258 1259 1260 1261
    if (osys->sar.num != sar_num || osys->sar.den != sar_den) {
        osys->ch_sar = true;
        osys->sar.num = sar_num;
        osys->sar.den = sar_den;
    }
}
void vout_SetDisplayCrop(vout_display_t *vd,
                         unsigned crop_num, unsigned crop_den,
1262
                         unsigned left, unsigned top, int right, int bottom)
1263 1264 1265
{
    vout_display_owner_sys_t *osys = vd->owner.sys;

1266 1267
    if (osys->crop.left  != (int)left  || osys->crop.top != (int)top ||
        osys->crop.right != right || osys->crop.bottom != bottom ||
1268 1269
        (crop_num > 0 && crop_den > 0 &&
         (crop_num != osys->crop.num || crop_den != osys->crop.den))) {
1270