/*
  Simple DirectMedia Layer
  Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.
*/

#include "SDL_internal.h"

#ifdef SDL_VIDEO_DRIVER_WAYLAND

#include <sys/mman.h>

#include "../SDL_sysvideo.h"
#include "../../events/SDL_events_c.h"
#include "../../core/unix/SDL_appid.h"
#include "../SDL_egl_c.h"
#include "SDL_waylandevents_c.h"
#include "SDL_waylandwindow.h"
#include "SDL_waylandvideo.h"
#include "../../SDL_hints_c.h"
#include "SDL_waylandcolor.h"

#include "alpha-modifier-v1-client-protocol.h"
#include "xdg-shell-client-protocol.h"
#include "xdg-decoration-unstable-v1-client-protocol.h"
#include "idle-inhibit-unstable-v1-client-protocol.h"
#include "xdg-activation-v1-client-protocol.h"
#include "viewporter-client-protocol.h"
#include "fractional-scale-v1-client-protocol.h"
#include "xdg-foreign-unstable-v2-client-protocol.h"
#include "xdg-dialog-v1-client-protocol.h"
#include "frog-color-management-v1-client-protocol.h"
#include "xdg-toplevel-icon-v1-client-protocol.h"
#include "color-management-v1-client-protocol.h"

#ifdef HAVE_LIBDECOR_H
#include <libdecor.h>
#endif

static double GetWindowScale(SDL_Window *window)
{
    return (window->flags & SDL_WINDOW_HIGH_PIXEL_DENSITY) || window->internal->scale_to_display ? window->internal->scale_factor : 1.0;
}

// These are point->pixel->point round trip safe; the inverse is not round trip safe due to rounding.
static int PointToPixel(SDL_Window *window, int point)
{
    /* Rounds halfway away from zero as per the Wayland fractional scaling protocol spec.
     * Wayland scale units are in units of 1/120, so the offset is required to correct for
     * rounding errors when using certain scale values.
     */
    return point ? SDL_max((int)SDL_lround((double)point * GetWindowScale(window) + 1e-6), 1) : 0;
}

static int PixelToPoint(SDL_Window *window, int pixel)
{
    return pixel ? SDL_max((int)SDL_lround((double)pixel / GetWindowScale(window)), 1) : 0;
}

/* According to the Wayland spec:
 *
 * "If the [fullscreen] surface doesn't cover the whole output, the compositor will
 * position the surface in the center of the output and compensate with border fill
 * covering the rest of the output. The content of the border fill is undefined, but
 * should be assumed to be in some way that attempts to blend into the surrounding area
 * (e.g. solid black)."
 *
 * - KDE, as of 5.27, still doesn't do this
 * - GNOME prior to 43 didn't do this (older versions are still found in many LTS distros)
 *
 * Default to 'stretch' for now, until things have moved forward enough that the default
 * can be changed to 'aspect'.
 */
enum WaylandModeScale
{
    WAYLAND_MODE_SCALE_UNDEFINED,
    WAYLAND_MODE_SCALE_ASPECT,
    WAYLAND_MODE_SCALE_STRETCH,
    WAYLAND_MODE_SCALE_NONE
};

static enum WaylandModeScale GetModeScaleMethod(void)
{
    static enum WaylandModeScale scale_mode = WAYLAND_MODE_SCALE_UNDEFINED;

    if (scale_mode == WAYLAND_MODE_SCALE_UNDEFINED) {
        const char *scale_hint = SDL_GetHint(SDL_HINT_VIDEO_WAYLAND_MODE_SCALING);

        if (scale_hint) {
            if (!SDL_strcasecmp(scale_hint, "aspect")) {
                scale_mode = WAYLAND_MODE_SCALE_ASPECT;
            } else if (!SDL_strcasecmp(scale_hint, "none")) {
                scale_mode = WAYLAND_MODE_SCALE_NONE;
            } else {
                scale_mode = WAYLAND_MODE_SCALE_STRETCH;
            }
        } else {
            scale_mode = WAYLAND_MODE_SCALE_STRETCH;
        }
    }

    return scale_mode;
}

static void GetBufferSize(SDL_Window *window, int *width, int *height)
{
    SDL_WindowData *data = window->internal;
    int buf_width;
    int buf_height;

    // Exclusive fullscreen modes always have a pixel density of 1
    if (data->is_fullscreen && window->fullscreen_exclusive) {
        buf_width = window->current_fullscreen_mode.w;
        buf_height = window->current_fullscreen_mode.h;
    } else if (!data->scale_to_display) {
        // Round fractional backbuffer sizes halfway away from zero.
        buf_width = PointToPixel(window, data->requested.logical_width);
        buf_height = PointToPixel(window, data->requested.logical_height);
    } else {
        buf_width = data->requested.pixel_width;
        buf_height = data->requested.pixel_height;
    }

    if (width) {
        *width = buf_width;
    }
    if (height) {
        *height = buf_height;
    }
}

static void SetMinMaxDimensions(SDL_Window *window)
{
    SDL_WindowData *wind = window->internal;
    int min_width, min_height, max_width, max_height;

    if ((window->flags & SDL_WINDOW_FULLSCREEN) || wind->fullscreen_deadline_count) {
        min_width = 0;
        min_height = 0;
        max_width = 0;
        max_height = 0;
    } else if (window->flags & SDL_WINDOW_RESIZABLE) {
        int adj_w = SDL_max(window->min_w, wind->system_limits.min_width);
        int adj_h = SDL_max(window->min_h, wind->system_limits.min_height);
        if (wind->scale_to_display) {
            adj_w = PixelToPoint(window, adj_w);
            adj_h = PixelToPoint(window, adj_h);
        }
        min_width = adj_w;
        min_height = adj_h;

        adj_w = window->max_w ? SDL_max(window->max_w, wind->system_limits.min_width) : 0;
        adj_h = window->max_h ? SDL_max(window->max_h, wind->system_limits.min_height) : 0;
        if (wind->scale_to_display) {
            adj_w = PixelToPoint(window, adj_w);
            adj_h = PixelToPoint(window, adj_h);
        }
        max_width = adj_w;
        max_height = adj_h;
    } else {
        min_width = wind->current.logical_width;
        min_height = wind->current.logical_height;
        max_width = wind->current.logical_width;
        max_height = wind->current.logical_height;
    }

#ifdef HAVE_LIBDECOR_H
    if (wind->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_LIBDECOR) {
        if (!wind->shell_surface.libdecor.frame) {
            return; // Can't do anything yet, wait for ShowWindow
        }
        /* No need to change these values if the window is non-resizable,
         * as libdecor will just overwrite them internally.
         */
        if (libdecor_frame_has_capability(wind->shell_surface.libdecor.frame, LIBDECOR_ACTION_RESIZE)) {
            libdecor_frame_set_min_content_size(wind->shell_surface.libdecor.frame,
                                                min_width,
                                                min_height);
            libdecor_frame_set_max_content_size(wind->shell_surface.libdecor.frame,
                                                max_width,
                                                max_height);
        }
    } else
#endif
        if (wind->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_XDG_TOPLEVEL) {
        if (!wind->shell_surface.xdg.toplevel.xdg_toplevel) {
            return; // Can't do anything yet, wait for ShowWindow
        }
        xdg_toplevel_set_min_size(wind->shell_surface.xdg.toplevel.xdg_toplevel,
                                  min_width,
                                  min_height);
        xdg_toplevel_set_max_size(wind->shell_surface.xdg.toplevel.xdg_toplevel,
                                  max_width,
                                  max_height);
    }
}

static void EnsurePopupPositionIsValid(SDL_Window *window, int *x, int *y)
{
    int adj_count = 0;

    /* Per the xdg-positioner spec, child popup windows must intersect or at
     * least be partially adjoining the parent window.
     *
     * Failure to ensure this on a compositor that enforces this restriction
     * can result in behavior ranging from the window being spuriously closed
     * to a protocol violation.
     */
    if (*x + window->w <= 0) {
        *x = -window->w;
        ++adj_count;
    }
    if (*y + window->h <= 0) {
        *y = -window->h;
        ++adj_count;
    }
    if (*x >= window->parent->w) {
        *x = window->parent->w;
        ++adj_count;
    }
    if (*y >= window->parent->h) {
        *y = window->parent->h;
        ++adj_count;
    }

    /* If adjustment was required on the x and y axes, the popup is aligned with
     * the parent corner-to-corner and is neither overlapping nor adjoining, so it
     * must be nudged by 1 to be considered adjoining.
     */
    if (adj_count > 1) {
        *x += *x < 0 ? 1 : -1;
    }
}

static void AdjustPopupOffset(SDL_Window *popup, int *x, int *y)
{
    // Adjust the popup positioning, if necessary
#ifdef HAVE_LIBDECOR_H
    if (popup->parent->internal->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_LIBDECOR) {
        int adj_x, adj_y;
        libdecor_frame_translate_coordinate(popup->parent->internal->shell_surface.libdecor.frame,
                                            *x, *y, &adj_x, &adj_y);
        *x = adj_x;
        *y = adj_y;
    }
#endif
}

static void RepositionPopup(SDL_Window *window, bool use_current_position)
{
    SDL_WindowData *wind = window->internal;

    if (wind->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_XDG_POPUP &&
        wind->shell_surface.xdg.popup.xdg_positioner &&
        xdg_popup_get_version(wind->shell_surface.xdg.popup.xdg_popup) >= XDG_POPUP_REPOSITION_SINCE_VERSION) {
        int x = use_current_position ? window->x : window->pending.x;
        int y = use_current_position ? window->y : window->pending.y;

        EnsurePopupPositionIsValid(window, &x, &y);
        if (wind->scale_to_display) {
            x = PixelToPoint(window->parent, x);
            y = PixelToPoint(window->parent, y);
        }
        AdjustPopupOffset(window, &x, &y);
        xdg_positioner_set_anchor_rect(wind->shell_surface.xdg.popup.xdg_positioner, 0, 0, window->parent->internal->current.logical_width, window->parent->internal->current.logical_height);
        xdg_positioner_set_size(wind->shell_surface.xdg.popup.xdg_positioner, wind->current.logical_width, wind->current.logical_height);
        xdg_positioner_set_offset(wind->shell_surface.xdg.popup.xdg_positioner, x, y);
        xdg_popup_reposition(wind->shell_surface.xdg.popup.xdg_popup,
                             wind->shell_surface.xdg.popup.xdg_positioner,
                             0);
    }
}

static void SetSurfaceOpaqueRegion(SDL_WindowData *wind, bool is_opaque)
{
    SDL_VideoData *viddata = wind->waylandData;

    if (is_opaque) {
        struct wl_region *region = wl_compositor_create_region(viddata->compositor);
        wl_region_add(region, 0, 0,
                      wind->current.logical_width, wind->current.logical_height);
        wl_surface_set_opaque_region(wind->surface, region);
        wl_region_destroy(region);
    } else {
        wl_surface_set_opaque_region(wind->surface, NULL);
    }
}

static void ConfigureWindowGeometry(SDL_Window *window)
{
    SDL_WindowData *data = window->internal;
    const double scale_factor = GetWindowScale(window);
    const int old_pixel_width = data->current.pixel_width;
    const int old_pixel_height = data->current.pixel_height;
    int window_width, window_height;
    bool window_size_changed;

    // Set the drawable backbuffer size.
    GetBufferSize(window, &data->current.pixel_width, &data->current.pixel_height);
    const bool buffer_size_changed = data->current.pixel_width != old_pixel_width ||
                                         data->current.pixel_height != old_pixel_height;

    if (data->egl_window && buffer_size_changed) {
        WAYLAND_wl_egl_window_resize(data->egl_window,
                                     data->current.pixel_width,
                                     data->current.pixel_height,
                                     0, 0);
    }

    if (data->is_fullscreen && window->fullscreen_exclusive) {
        int output_width;
        int output_height;
        window_width = window->current_fullscreen_mode.w;
        window_height = window->current_fullscreen_mode.h;

        output_width = data->requested.logical_width;
        output_height = data->requested.logical_height;

        switch (GetModeScaleMethod()) {
        case WAYLAND_MODE_SCALE_NONE:
            /* The Wayland spec states that the advertised fullscreen dimensions are a maximum.
             * Windows can request a smaller size, but exceeding these dimensions is a protocol violation,
             * thus, modes that exceed the output size still need to be scaled with a viewport.
             */
            if (window_width <= output_width && window_height <= output_height) {
                output_width = window_width;
                output_height = window_height;

                break;
            }
            SDL_FALLTHROUGH;
        case WAYLAND_MODE_SCALE_ASPECT:
        {
            const float output_ratio = (float)output_width / (float)output_height;
            const float mode_ratio = (float)window_width / (float)window_height;

            if (output_ratio > mode_ratio) {
                output_width = SDL_lroundf((float)window_width * ((float)output_height / (float)window_height));
            } else if (output_ratio < mode_ratio) {
                output_height = SDL_lroundf((float)window_height * ((float)output_width / (float)window_width));
            }
        } break;
        default:
            break;
        }

        window_size_changed = window_width != window->w || window_height != window->h ||
            data->current.logical_width != output_width || data->current.logical_height != output_height;

        if (window_size_changed || buffer_size_changed) {
            if (data->viewport) {
                wp_viewport_set_destination(data->viewport, output_width, output_height);

                data->current.logical_width = output_width;
                data->current.logical_height = output_height;
            } else {
                // Calculate the integer scale from the mode and output.
                const int32_t int_scale = SDL_max(window->current_fullscreen_mode.w / output_width, 1);

                wl_surface_set_buffer_scale(data->surface, int_scale);
                data->current.logical_width = window->current_fullscreen_mode.w;
                data->current.logical_height = window->current_fullscreen_mode.h;
            }

            data->pointer_scale.x = (double)window_width / (double)data->current.logical_width;
            data->pointer_scale.y = (double)window_height / (double)data->current.logical_height;
        }
    } else {
        window_width = data->requested.logical_width;
        window_height = data->requested.logical_height;

        window_size_changed = window_width != data->current.logical_width || window_height != data->current.logical_height;

        if (window_size_changed || buffer_size_changed) {
            if (data->viewport) {
                wp_viewport_set_destination(data->viewport, window_width, window_height);
            } else if (window->flags & SDL_WINDOW_HIGH_PIXEL_DENSITY) {
                // Don't change this if the DPI awareness flag is unset, as an application may have set this manually on a custom or external surface.
                wl_surface_set_buffer_scale(data->surface, (int32_t)scale_factor);
            }

            // Clamp the physical window size to the system minimum required size.
            data->current.logical_width = SDL_max(window_width, data->system_limits.min_width);
            data->current.logical_height = SDL_max(window_height, data->system_limits.min_height);

            if (!data->scale_to_display) {
                data->pointer_scale.x = 1.0;
                data->pointer_scale.y = 1.0;
            } else {
                data->pointer_scale.x = scale_factor;
                data->pointer_scale.y = scale_factor;
            }
        }
    }

    /*
     * The surface geometry, opaque region and pointer confinement region only
     * need to be recalculated if the output size has changed.
     */
    if (window_size_changed) {
        /* XXX: This is a hack and only set on the xdg-toplevel path when viewports
         *      aren't supported to avoid a potential protocol violation if a buffer
         *      with an old size is committed.
         */
        if (!data->viewport && data->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_XDG_TOPLEVEL && data->shell_surface.xdg.surface) {
            xdg_surface_set_window_geometry(data->shell_surface.xdg.surface, 0, 0, data->current.logical_width, data->current.logical_height);
        }

        SetSurfaceOpaqueRegion(data, !(window->flags & SDL_WINDOW_TRANSPARENT) && window->opacity == 1.0f);

        // Ensure that child popup windows are still in bounds.
        for (SDL_Window *child = window->first_child; child; child = child->next_sibling) {
            RepositionPopup(child, true);
        }
    }

    /* Update the min/max dimensions, primarily if the state was changed, and for non-resizable
     * xdg-toplevel windows where the limits should match the window size.
     */
    SetMinMaxDimensions(window);

    // Unconditionally send the window and drawable size, the video core will deduplicate when required.
    if (!data->scale_to_display) {
        SDL_SendWindowEvent(window, SDL_EVENT_WINDOW_RESIZED, window_width, window_height);
    } else {
        SDL_SendWindowEvent(window, SDL_EVENT_WINDOW_RESIZED, data->current.pixel_width, data->current.pixel_height);
    }
    SDL_SendWindowEvent(window, SDL_EVENT_WINDOW_PIXEL_SIZE_CHANGED, data->current.pixel_width, data->current.pixel_height);

    /* Send an exposure event if the window is in the shown state and the size has changed,
     * even if the window is occluded, as the client needs to commit a new frame for the
     * changes to take effect.
     *
     * The occlusion state is immediately set again afterward, if necessary.
     */
    if (data->shell_surface_status == WAYLAND_SHELL_SURFACE_STATUS_SHOWN) {
        if ((buffer_size_changed || window_size_changed) ||
            (!data->suspended && (window->flags & SDL_WINDOW_OCCLUDED))) {
            SDL_SendWindowEvent(window, SDL_EVENT_WINDOW_EXPOSED, 0, 0);
        }

        if (data->suspended) {
            SDL_SendWindowEvent(window, SDL_EVENT_WINDOW_OCCLUDED, 0, 0);
        }
    }
}

static void CommitLibdecorFrame(SDL_Window *window)
{
#ifdef HAVE_LIBDECOR_H
    SDL_WindowData *wind = window->internal;

    if (wind->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_LIBDECOR && wind->shell_surface.libdecor.frame) {
        struct libdecor_state *state = libdecor_state_new(wind->current.logical_width, wind->current.logical_height);
        libdecor_frame_commit(wind->shell_surface.libdecor.frame, state, NULL);
        libdecor_state_free(state);
    }
#endif
}

static void fullscreen_deadline_handler(void *data, struct wl_callback *callback, uint32_t callback_data)
{
    // Get the window from the ID as it may have been destroyed
    SDL_WindowID windowID = (SDL_WindowID)((uintptr_t)data);
    SDL_Window *window = SDL_GetWindowFromID(windowID);

    if (window && window->internal) {
        window->internal->fullscreen_deadline_count--;
    }

    wl_callback_destroy(callback);
}

static struct wl_callback_listener fullscreen_deadline_listener = {
    fullscreen_deadline_handler
};

static void maximized_restored_deadline_handler(void *data, struct wl_callback *callback, uint32_t callback_data)
{
    // Get the window from the ID as it may have been destroyed
    SDL_WindowID windowID = (SDL_WindowID)((uintptr_t)data);
    SDL_Window *window = SDL_GetWindowFromID(windowID);

    if (window && window->internal) {
        window->internal->maximized_restored_deadline_count--;
    }

    wl_callback_destroy(callback);
}

static struct wl_callback_listener maximized_restored_deadline_listener = {
    maximized_restored_deadline_handler
};

static void FlushPendingEvents(SDL_Window *window)
{
    // Serialize and restore the pending flags, as they may be overwritten while flushing.
    const bool last_position_pending = window->last_position_pending;
    const bool last_size_pending = window->last_size_pending;

    while (window->internal->fullscreen_deadline_count || window->internal->maximized_restored_deadline_count) {
        WAYLAND_wl_display_roundtrip(window->internal->waylandData->display);
    }

    window->last_position_pending = last_position_pending;
    window->last_size_pending = last_size_pending;
}

/* While we can't get window position from the compositor, we do at least know
 * what monitor we're on, so let's send move events that put the window at the
 * center of the whatever display the wl_surface_listener events give us.
 */
static void Wayland_move_window(SDL_Window *window)
{
    SDL_WindowData *wind = window->internal;
    SDL_DisplayData *display;
    SDL_DisplayID *displays;

    if (wind->outputs && wind->num_outputs) {
        display = wind->outputs[wind->num_outputs - 1];
    } else {
        // A window may not be on any displays if minimized.
        return;
    }

    displays = SDL_GetDisplays(NULL);
    if (displays) {
        for (int i = 0; displays[i]; ++i) {
            if (SDL_GetDisplayDriverData(displays[i]) == display) {
                /* We want to send a very very specific combination here:
                 *
                 * 1. A coordinate that tells the application what display we're on
                 * 2. Exactly (0, 0)
                 *
                 * Part 1 is useful information but is also really important for
                 * ensuring we end up on the right display for fullscreen, while
                 * part 2 is important because numerous applications use a specific
                 * combination of GetWindowPosition and GetGlobalMouseState, and of
                 * course neither are supported by Wayland. Since global mouse will
                 * fall back to just GetMouseState, we need the window position to
                 * be zero so the cursor math works without it going off in some
                 * random direction. See UE5 Editor for a notable example of this!
                 *
                 * This may be an issue some day if we're ever able to implement
                 * SDL_GetDisplayUsableBounds!
                 *
                 * -flibit
                 */

                if (wind->last_displayID != displays[i]) {
                    wind->last_displayID = displays[i];
                    if (wind->shell_surface_type != WAYLAND_SHELL_SURFACE_TYPE_XDG_POPUP) {
                        SDL_SendWindowEvent(window, SDL_EVENT_WINDOW_MOVED, display->x, display->y);
                        SDL_SendWindowEvent(window, SDL_EVENT_WINDOW_DISPLAY_CHANGED, wind->last_displayID, 0);
                    }
                }
                break;
            }
        }
        SDL_free(displays);
    }
}

static void SetFullscreen(SDL_Window *window, struct wl_output *output, bool fullscreen)
{
    SDL_WindowData *wind = window->internal;
    SDL_VideoData *viddata = wind->waylandData;

#ifdef HAVE_LIBDECOR_H
    if (wind->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_LIBDECOR) {
        if (!wind->shell_surface.libdecor.frame) {
            return; // Can't do anything yet, wait for ShowWindow
        }

        wind->fullscreen_exclusive = output ? window->fullscreen_exclusive : false;
        ++wind->fullscreen_deadline_count;
        if (fullscreen) {
            Wayland_SetWindowResizable(SDL_GetVideoDevice(), window, true);
            wl_surface_commit(wind->surface);

            libdecor_frame_set_fullscreen(wind->shell_surface.libdecor.frame, output);
        } else {
            libdecor_frame_unset_fullscreen(wind->shell_surface.libdecor.frame);
        }
    } else
#endif
        if (wind->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_XDG_TOPLEVEL) {
        if (wind->shell_surface.xdg.toplevel.xdg_toplevel == NULL) {
            return; // Can't do anything yet, wait for ShowWindow
        }

        wind->fullscreen_exclusive = output ? window->fullscreen_exclusive : false;
        ++wind->fullscreen_deadline_count;
        if (fullscreen) {
            Wayland_SetWindowResizable(SDL_GetVideoDevice(), window, true);
            wl_surface_commit(wind->surface);

            xdg_toplevel_set_fullscreen(wind->shell_surface.xdg.toplevel.xdg_toplevel, output);
        } else {
            xdg_toplevel_unset_fullscreen(wind->shell_surface.xdg.toplevel.xdg_toplevel);
        }
    }

    // Queue a deadline event
    struct wl_callback *cb = wl_display_sync(viddata->display);
    wl_callback_add_listener(cb, &fullscreen_deadline_listener, (void *)((uintptr_t)window->id));
}

static void UpdateWindowFullscreen(SDL_Window *window, bool fullscreen)
{
    SDL_WindowData *wind = window->internal;

    wind->is_fullscreen = fullscreen;

    if (fullscreen) {
        if (!(window->flags & SDL_WINDOW_FULLSCREEN)) {
            SDL_copyp(&window->current_fullscreen_mode, &window->requested_fullscreen_mode);
            SDL_SendWindowEvent(window, SDL_EVENT_WINDOW_ENTER_FULLSCREEN, 0, 0);
            SDL_UpdateFullscreenMode(window, SDL_FULLSCREEN_OP_ENTER, false);

            /* Set the output for exclusive fullscreen windows when entering fullscreen from a
             * compositor event, or if the fullscreen parameters were changed between the initial
             * fullscreen request and now, to ensure that the window is on the correct output,
             * as requested by the client.
             */
            if (window->fullscreen_exclusive && (!wind->fullscreen_exclusive || !wind->fullscreen_was_positioned)) {
                SDL_VideoDisplay *disp = SDL_GetVideoDisplay(window->current_fullscreen_mode.displayID);
                if (disp) {
                    wind->fullscreen_was_positioned = true;
                    SetFullscreen(window, disp->internal->output, true);
                }
            }
        }
    } else {
        // Don't change the fullscreen flags if the window is hidden or being hidden.
        if ((window->flags & SDL_WINDOW_FULLSCREEN) && !window->is_hiding && !(window->flags & SDL_WINDOW_HIDDEN)) {
            SDL_SendWindowEvent(window, SDL_EVENT_WINDOW_LEAVE_FULLSCREEN, 0, 0);
            SDL_UpdateFullscreenMode(window, SDL_FULLSCREEN_OP_LEAVE, false);
            wind->fullscreen_was_positioned = false;

            /* Send a move event, in case it was deferred while the fullscreen window was moving and
             * on multiple outputs.
             */
            Wayland_move_window(window);
        }
    }
}

static const struct wl_callback_listener surface_frame_listener;

static void surface_frame_done(void *data, struct wl_callback *cb, uint32_t time)
{
    SDL_WindowData *wind = (SDL_WindowData *)data;

    /* XXX: This is needed to work around an Nvidia egl-wayland bug due to buffer coordinates
     *      being used with wl_surface_damage, which causes part of the output to not be
     *      updated when using a viewport with an output region larger than the source region.
     */
    if (wl_compositor_get_version(wind->waylandData->compositor) >= WL_SURFACE_DAMAGE_BUFFER_SINCE_VERSION) {
        wl_surface_damage_buffer(wind->surface, 0, 0, SDL_MAX_SINT32, SDL_MAX_SINT32);
    } else {
        wl_surface_damage(wind->surface, 0, 0, SDL_MAX_SINT32, SDL_MAX_SINT32);
    }

    if (wind->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_XDG_TOPLEVEL) {
        if (wind->pending_config_ack) {
            wind->pending_config_ack = false;
            ConfigureWindowGeometry(wind->sdlwindow);
            xdg_surface_ack_configure(wind->shell_surface.xdg.surface, wind->shell_surface.xdg.serial);
        }
    } else {
        wind->resizing = false;
    }

    if (wind->shell_surface_status == WAYLAND_SHELL_SURFACE_STATUS_WAITING_FOR_FRAME) {
        wind->shell_surface_status = WAYLAND_SHELL_SURFACE_STATUS_SHOWN;

        // If any child windows are waiting on this window to be shown, show them now
        for (SDL_Window *w = wind->sdlwindow->first_child; w; w = w->next_sibling) {
            if (w->internal->shell_surface_status == WAYLAND_SHELL_SURFACE_STATUS_SHOW_PENDING) {
                Wayland_ShowWindow(SDL_GetVideoDevice(), w);
            } else if (w->internal->reparenting_required) {
                Wayland_SetWindowParent(SDL_GetVideoDevice(), w, w->parent);
                if (w->flags & SDL_WINDOW_MODAL) {
                    Wayland_SetWindowModal(SDL_GetVideoDevice(), w, true);
                }
            }
        }

        /* If the window was initially set to the suspended state, send the occluded event now,
         * as we don't want to mark the window as occluded until at least one frame has been submitted.
         */
        if (wind->suspended) {
            SDL_SendWindowEvent(wind->sdlwindow, SDL_EVENT_WINDOW_OCCLUDED, 0, 0);
        }
    }

    wl_callback_destroy(cb);
    wind->surface_frame_callback = wl_surface_frame(wind->surface);
    wl_callback_add_listener(wind->surface_frame_callback, &surface_frame_listener, data);
}

static const struct wl_callback_listener surface_frame_listener = {
    surface_frame_done
};

static const struct wl_callback_listener gles_swap_frame_listener;

static void gles_swap_frame_done(void *data, struct wl_callback *cb, uint32_t time)
{
    SDL_WindowData *wind = (SDL_WindowData *)data;
    SDL_SetAtomicInt(&wind->swap_interval_ready, 1); // mark window as ready to present again.

    // reset this callback to fire again once a new frame was presented and compositor wants the next one.
    wind->gles_swap_frame_callback = wl_surface_frame(wind->gles_swap_frame_surface_wrapper);
    wl_callback_destroy(cb);
    wl_callback_add_listener(wind->gles_swap_frame_callback, &gles_swap_frame_listener, data);
}

static const struct wl_callback_listener gles_swap_frame_listener = {
    gles_swap_frame_done
};

static void handle_xdg_surface_configure(void *data, struct xdg_surface *xdg, uint32_t serial)
{
    SDL_WindowData *wind = (SDL_WindowData *)data;
    SDL_Window *window = wind->sdlwindow;

    /* Interactive resizes are throttled by acking and committing only the most recent configuration at
     * the next frame callback, or certain combinations of clients and compositors can exhibit severe lag
     * when resizing.
     */
    wind->shell_surface.xdg.serial = serial;
    if (!wind->resizing) {
        wind->pending_config_ack = false;
        ConfigureWindowGeometry(window);
        xdg_surface_ack_configure(xdg, serial);
    } else {
        wind->pending_config_ack = true;
    }

    if (wind->shell_surface_status == WAYLAND_SHELL_SURFACE_STATUS_WAITING_FOR_CONFIGURE) {
        wind->shell_surface_status = WAYLAND_SHELL_SURFACE_STATUS_WAITING_FOR_FRAME;
    }
}

static const struct xdg_surface_listener _xdg_surface_listener = {
    handle_xdg_surface_configure
};

static void handle_xdg_toplevel_configure(void *data,
                                          struct xdg_toplevel *xdg_toplevel,
                                          int32_t width,
                                          int32_t height,
                                          struct wl_array *states)
{
    SDL_WindowData *wind = (SDL_WindowData *)data;
    SDL_Window *window = wind->sdlwindow;

    enum xdg_toplevel_state *state;
    bool fullscreen = false;
    bool maximized = false;
    bool floating = true;
    bool tiled = false;
    bool active = false;
    bool resizing = false;
    bool suspended = false;
    wind->toplevel_constraints = 0;
    wl_array_for_each (state, states) {
        switch (*state) {
        case XDG_TOPLEVEL_STATE_FULLSCREEN:
            fullscreen = true;
            floating = false;
            break;
        case XDG_TOPLEVEL_STATE_MAXIMIZED:
            maximized = true;
            floating = false;
            break;
        case XDG_TOPLEVEL_STATE_RESIZING:
            resizing = true;
            break;
        case XDG_TOPLEVEL_STATE_ACTIVATED:
            active = true;
            break;
        case XDG_TOPLEVEL_STATE_TILED_LEFT:
        case XDG_TOPLEVEL_STATE_TILED_RIGHT:
        case XDG_TOPLEVEL_STATE_TILED_TOP:
        case XDG_TOPLEVEL_STATE_TILED_BOTTOM:
            tiled = true;
            floating = false;
            break;
        case XDG_TOPLEVEL_STATE_SUSPENDED:
            suspended = true;
            break;
        case XDG_TOPLEVEL_STATE_CONSTRAINED_LEFT:
            wind->toplevel_constraints |= WAYLAND_TOPLEVEL_CONSTRAINED_LEFT;
            break;
        case XDG_TOPLEVEL_STATE_CONSTRAINED_RIGHT:
            wind->toplevel_constraints |= WAYLAND_TOPLEVEL_CONSTRAINED_RIGHT;
            break;
        case XDG_TOPLEVEL_STATE_CONSTRAINED_TOP:
            wind->toplevel_constraints |= WAYLAND_TOPLEVEL_CONSTRAINED_TOP;
            break;
        case XDG_TOPLEVEL_STATE_CONSTRAINED_BOTTOM:
            wind->toplevel_constraints |= WAYLAND_TOPLEVEL_CONSTRAINED_BOTTOM;
            break;
        default:
            break;
        }
    }

    UpdateWindowFullscreen(window, fullscreen);

    /* Always send a maximized/restore event; if the event is redundant it will
     * automatically be discarded (see src/events/SDL_windowevents.c)
     *
     * No, we do not get minimize events from xdg-shell, however, the minimized
     * state can be programmatically set. The meaning of 'minimized' is compositor
     * dependent, but in general, we can assume that the flag should remain set until
     * the next focused configure event occurs.
     */
    if (active || !(window->flags & SDL_WINDOW_MINIMIZED)) {
        if (window->flags & SDL_WINDOW_MINIMIZED) {
            // If we were minimized, send a restored event before possibly sending maximized.
            SDL_SendWindowEvent(window, SDL_EVENT_WINDOW_RESTORED, 0, 0);
        }
        SDL_SendWindowEvent(window,
                            (maximized && !fullscreen) ? SDL_EVENT_WINDOW_MAXIMIZED : SDL_EVENT_WINDOW_RESTORED,
                            0, 0);
    }

    if (!fullscreen) {
        /* xdg_toplevel spec states that this is a suggestion.
         * Ignore if less than or greater than max/min size.
         */
        if (window->flags & SDL_WINDOW_RESIZABLE) {
            if (width == 0 || height == 0) {
                /* This happens when the compositor indicates that the size is
                 * up to the client, so use the cached window size here.
                 */
                if (floating) {
                    width = window->floating.w;
                    height = window->floating.h;

                    // Clamp the window to the toplevel bounds, if any are set.
                    if (wind->shell_surface_status == WAYLAND_SHELL_SURFACE_STATUS_WAITING_FOR_CONFIGURE &&
                        wind->toplevel_bounds.width && wind->toplevel_bounds.height) {
                        width = SDL_min(wind->toplevel_bounds.width, width);
                        height = SDL_min(wind->toplevel_bounds.height, height);
                    }
                } else {
                    width = window->windowed.w;
                    height = window->windowed.h;
                }

                if (!wind->scale_to_display) {
                    wind->requested.logical_width = width;
                    wind->requested.logical_height = height;
                } else {
                    wind->requested.pixel_width = width;
                    wind->requested.pixel_height = height;
                    width = wind->requested.logical_width = PixelToPoint(window, width);
                    height = wind->requested.logical_height = PixelToPoint(window, height);
                }
            } else {
                /* Don't apply the supplied dimensions if they haven't changed from the last configuration
                 * event, or a newer size set programmatically can be overwritten by old data.
                 */
                if (width != wind->last_configure.width || height != wind->last_configure.height) {
                    wind->requested.logical_width = width;
                    wind->requested.logical_height = height;

                    if (wind->scale_to_display) {
                        wind->requested.pixel_width = PointToPixel(window, width);
                        wind->requested.pixel_height = PointToPixel(window, height);
                    }
                }
            }
        } else {
            /* If we're a fixed-size window, we know our size for sure.
             * Always assume the configure is wrong.
             */
            if (!wind->scale_to_display) {
                width = wind->requested.logical_width = window->floating.w;
                height = wind->requested.logical_height = window->floating.h;
            } else {
                wind->requested.pixel_width = window->floating.w;
                wind->requested.pixel_height = window->floating.h;
                width = wind->requested.logical_width = PixelToPoint(window, window->floating.w);
                height = wind->requested.logical_height = PixelToPoint(window, window->floating.h);
            }
        }

        /* Notes on the spec:
         *
         * - The content limits are only a hint, which the compositor is free to ignore,
         *   so apply them manually when appropriate.
         *
         * - Maximized windows must have their exact dimensions respected, thus they must
         *   not be resized, or a protocol violation can occur.
         *
         * - When resizing a window, the width/height are maximum values, so aspect ratio
         *   correction can't resize beyond the existing dimensions, or a protocol violation
         *   can occur. In practice, nothing seems to kill clients that do this, but doing
         *   so causes GNOME to glitch out.
         */
        if (!maximized) {
            if (!wind->scale_to_display) {
                if (window->max_w > 0) {
                    wind->requested.logical_width = SDL_min(wind->requested.logical_width, window->max_w);
                }
                wind->requested.logical_width = SDL_max(wind->requested.logical_width, window->min_w);

                if (window->max_h > 0) {
                    wind->requested.logical_height = SDL_min(wind->requested.logical_height, window->max_h);
                }
                wind->requested.logical_height = SDL_max(wind->requested.logical_height, window->min_h);

                // Aspect correction.
                const float aspect = (float)wind->requested.logical_width / (float)wind->requested.logical_height;

                if (window->min_aspect != 0.f && aspect < window->min_aspect) {
                    wind->requested.logical_height = SDL_lroundf((float)wind->requested.logical_width / window->min_aspect);
                } else if (window->max_aspect != 0.f && aspect > window->max_aspect) {
                    wind->requested.logical_width = SDL_lroundf((float)wind->requested.logical_height * window->max_aspect);
                }
            } else {
                if (window->max_w > 0) {
                    wind->requested.pixel_width = SDL_min(wind->requested.pixel_width, window->max_w);
                }
                wind->requested.pixel_width = SDL_max(wind->requested.pixel_width, window->min_w);

                if (window->max_h > 0) {
                    wind->requested.pixel_height = SDL_min(wind->requested.pixel_height, window->max_h);
                }
                wind->requested.pixel_height = SDL_max(wind->requested.pixel_height, window->min_h);

                // Aspect correction.
                const float aspect = (float)wind->requested.pixel_width / (float)wind->requested.pixel_height;

                if (window->min_aspect != 0.f && aspect < window->min_aspect) {
                    wind->requested.pixel_height = SDL_lroundf((float)wind->requested.pixel_width / window->min_aspect);
                } else if (window->max_aspect != 0.f && aspect > window->max_aspect) {
                    wind->requested.pixel_width = SDL_lroundf((float)wind->requested.pixel_height * window->max_aspect);
                }

                wind->requested.logical_width = PixelToPoint(window, wind->requested.pixel_width);
                wind->requested.logical_height = PixelToPoint(window, wind->requested.pixel_height);
            }
        }
    } else {
        // Fullscreen windows know their exact size.
        if (width == 0 || height == 0) {
            width = wind->requested.logical_width;
            height = wind->requested.logical_height;
        } else {
            wind->requested.logical_width = width;
            wind->requested.logical_height = height;
        }

        if (wind->scale_to_display) {
            wind->requested.pixel_width = PointToPixel(window, width);
            wind->requested.pixel_height = PointToPixel(window, height);
        }
    }

    wind->last_configure.width = width;
    wind->last_configure.height = height;
    wind->floating = floating;
    wind->suspended = suspended;
    wind->active = active;
    window->tiled = tiled;
    wind->resizing = resizing;
}

static void handle_xdg_toplevel_close(void *data, struct xdg_toplevel *xdg_toplevel)
{
    SDL_WindowData *window = (SDL_WindowData *)data;
    SDL_SendWindowEvent(window->sdlwindow, SDL_EVENT_WINDOW_CLOSE_REQUESTED, 0, 0);
}

static void handle_xdg_toplevel_configure_bounds(void *data,
                                                 struct xdg_toplevel *xdg_toplevel,
                                                 int32_t width, int32_t height)
{
    SDL_WindowData *window = (SDL_WindowData *)data;
    window->toplevel_bounds.width = width;
    window->toplevel_bounds.height = height;
}

static void handle_xdg_toplevel_wm_capabilities(void *data,
                                                struct xdg_toplevel *xdg_toplevel,
                                                struct wl_array *capabilities)
{
    SDL_WindowData *wind = (SDL_WindowData *)data;
    enum xdg_toplevel_wm_capabilities *wm_cap;

    wind->wm_caps = 0;

    wl_array_for_each (wm_cap, capabilities) {
        switch (*wm_cap) {
        case XDG_TOPLEVEL_WM_CAPABILITIES_WINDOW_MENU:
            wind->wm_caps |= WAYLAND_WM_CAPS_WINDOW_MENU;
            break;
        case XDG_TOPLEVEL_WM_CAPABILITIES_MAXIMIZE:
            wind->wm_caps |= WAYLAND_WM_CAPS_MAXIMIZE;
            break;
        case XDG_TOPLEVEL_WM_CAPABILITIES_FULLSCREEN:
            wind->wm_caps |= WAYLAND_WM_CAPS_FULLSCREEN;
            break;
        case XDG_TOPLEVEL_WM_CAPABILITIES_MINIMIZE:
            wind->wm_caps |= WAYLAND_WM_CAPS_MINIMIZE;
            break;
        default:
            break;
        }
    }
}

static const struct xdg_toplevel_listener toplevel_listener_xdg = {
    handle_xdg_toplevel_configure,
    handle_xdg_toplevel_close,
    handle_xdg_toplevel_configure_bounds, // Version 4
    handle_xdg_toplevel_wm_capabilities   // Version 5
};

static void handle_xdg_popup_configure(void *data,
                                       struct xdg_popup *xdg_popup,
                                       int32_t x,
                                       int32_t y,
                                       int32_t width,
                                       int32_t height)
{
    SDL_WindowData *wind = (SDL_WindowData *)data;
    int offset_x = 0, offset_y = 0;

    // Adjust the position if it was offset for libdecor
    AdjustPopupOffset(wind->sdlwindow, &offset_x, &offset_y);
    x -= offset_x;
    y -= offset_y;

    /* This happens when the compositor indicates that the size is
     * up to the client, so use the cached window size here.
     */
    if (width == 0 || height == 0) {
        width = wind->sdlwindow->floating.w;
        height = wind->sdlwindow->floating.h;
    }

    /* Don't apply the supplied dimensions if they haven't changed from the last configuration
     * event, or a newer size set programmatically can be overwritten by old data.
     */
    if (width != wind->last_configure.width || height != wind->last_configure.height) {
        wind->requested.logical_width = width;
        wind->requested.logical_height = height;

        if (wind->scale_to_display) {
            wind->requested.pixel_width = PointToPixel(wind->sdlwindow, width);
            wind->requested.pixel_height = PointToPixel(wind->sdlwindow, height);
        }
    }

    if (wind->scale_to_display) {
        x = PointToPixel(wind->sdlwindow->parent, x);
        y = PointToPixel(wind->sdlwindow->parent, y);
    }

    SDL_SendWindowEvent(wind->sdlwindow, SDL_EVENT_WINDOW_MOVED, x, y);

    wind->last_configure.width = width;
    wind->last_configure.height = height;

    if (wind->shell_surface_status == WAYLAND_SHELL_SURFACE_STATUS_WAITING_FOR_CONFIGURE) {
        wind->shell_surface_status = WAYLAND_SHELL_SURFACE_STATUS_WAITING_FOR_FRAME;
    }
}

static void handle_xdg_popup_done(void *data, struct xdg_popup *xdg_popup)
{
    SDL_WindowData *window = (SDL_WindowData *)data;
    SDL_SendWindowEvent(window->sdlwindow, SDL_EVENT_WINDOW_CLOSE_REQUESTED, 0, 0);
}

static void handle_xdg_popup_repositioned(void *data,
                                          struct xdg_popup *xdg_popup,
                                          uint32_t token)
{
    // No-op, configure does all the work we care about
}

static const struct xdg_popup_listener _xdg_popup_listener = {
    handle_xdg_popup_configure,
    handle_xdg_popup_done,
    handle_xdg_popup_repositioned
};

static void handle_xdg_toplevel_decoration_configure(void *data,
                                                     struct zxdg_toplevel_decoration_v1 *zxdg_toplevel_decoration_v1,
                                                     uint32_t mode)
{
    SDL_Window *window = (SDL_Window *)data;
    SDL_WindowData *internal = window->internal;
    SDL_VideoDevice *device = SDL_GetVideoDevice();

    /* If the compositor tries to force CSD anyway, bail on direct XDG support
     * and fall back to libdecor, it will handle these events from then on.
     *
     * To do this we have to fully unmap, then map with libdecor loaded.
     */
    if (mode == ZXDG_TOPLEVEL_DECORATION_V1_MODE_CLIENT_SIDE) {
        if (window->flags & SDL_WINDOW_BORDERLESS) {
            // borderless windows do request CSD, so we got what we wanted
            return;
        }
        if (!Wayland_LoadLibdecor(internal->waylandData, true)) {
            // libdecor isn't available, so no borders for you... oh well
            return;
        }
        WAYLAND_wl_display_roundtrip(internal->waylandData->display);

        Wayland_HideWindow(device, window);
        internal->shell_surface_type = WAYLAND_SHELL_SURFACE_TYPE_LIBDECOR;
        Wayland_ShowWindow(device, window);
    }
}

static const struct zxdg_toplevel_decoration_v1_listener xdg_toplevel_decoration_listener = {
    handle_xdg_toplevel_decoration_configure
};

#ifdef HAVE_LIBDECOR_H
/*
 * XXX: Hack for older versions of libdecor that lack the function to query the
 *      minimum content size limit. The internal limits must always be overridden
 *      to ensure that very small windows don't cause errors or crashes.
 *
 *      On libdecor >= 0.1.2, which exposes the function to get the minimum content
 *      size limit, this function is a no-op.
 *
 *      Can be removed if the minimum required version of libdecor is raised to
 *      0.1.2 or higher.
 */
static void OverrideLibdecorLimits(SDL_Window *window)
{
#ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_LIBDECOR
    if (!libdecor_frame_get_min_content_size) {
        libdecor_frame_set_min_content_size(window->internal->shell_surface.libdecor.frame, window->min_w, window->min_h);
    }
#elif !SDL_LIBDECOR_CHECK_VERSION(0, 2, 0)
    libdecor_frame_set_min_content_size(window->internal->shell_surface.libdecor.frame, window->min_w, window->min_h);
#endif
}

/*
 * NOTE: Retrieves the minimum content size limits, if the function for doing so is available.
 *       On versions of libdecor that lack the minimum content size retrieval function, this
 *       function is a no-op.
 *
 *       Can be replaced with a direct call if the minimum required version of libdecor is raised
 *       to 0.1.2 or higher.
 */
static void LibdecorGetMinContentSize(struct libdecor_frame *frame, int *min_w, int *min_h)
{
#ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_LIBDECOR
    if (libdecor_frame_get_min_content_size != NULL) {
        libdecor_frame_get_min_content_size(frame, min_w, min_h);
    }
#elif SDL_LIBDECOR_CHECK_VERSION(0, 2, 0)
    libdecor_frame_get_min_content_size(frame, min_w, min_h);
#endif
}

static void decoration_frame_configure(struct libdecor_frame *frame,
                                       struct libdecor_configuration *configuration,
                                       void *user_data)
{
    SDL_WindowData *wind = (SDL_WindowData *)user_data;
    SDL_Window *window = wind->sdlwindow;

    enum libdecor_window_state window_state;
    int width, height;

    bool prev_fullscreen = wind->is_fullscreen;
    bool active = false;
    bool fullscreen = false;
    bool maximized = false;
    bool tiled = false;
    bool suspended = false;
    bool resizing = false;
    wind->toplevel_constraints = 0;

    static const enum libdecor_window_state tiled_states = (LIBDECOR_WINDOW_STATE_TILED_LEFT | LIBDECOR_WINDOW_STATE_TILED_RIGHT |
                                                            LIBDECOR_WINDOW_STATE_TILED_TOP | LIBDECOR_WINDOW_STATE_TILED_BOTTOM);

    // Window State
    if (libdecor_configuration_get_window_state(configuration, &window_state)) {
        fullscreen = (window_state & LIBDECOR_WINDOW_STATE_FULLSCREEN) != 0;
        maximized = (window_state & LIBDECOR_WINDOW_STATE_MAXIMIZED) != 0;
        active = (window_state & LIBDECOR_WINDOW_STATE_ACTIVE) != 0;
        tiled = (window_state & tiled_states) != 0;
#if SDL_LIBDECOR_CHECK_VERSION(0, 2, 0)
        suspended = (window_state & LIBDECOR_WINDOW_STATE_SUSPENDED) != 0;
#endif
#if SDL_LIBDECOR_CHECK_VERSION(0, 3, 0)
        resizing = (window_state & LIBDECOR_WINDOW_STATE_RESIZING) != 0;

        if (window_state & LIBDECOR_WINDOW_STATE_CONSTRAINED_LEFT) {
            wind->toplevel_constraints |= WAYLAND_TOPLEVEL_CONSTRAINED_LEFT;
        }
        if (window_state & LIBDECOR_WINDOW_STATE_CONSTRAINED_RIGHT) {
            wind->toplevel_constraints |= WAYLAND_TOPLEVEL_CONSTRAINED_RIGHT;
        }
        if (window_state & LIBDECOR_WINDOW_STATE_CONSTRAINED_TOP) {
            wind->toplevel_constraints |= WAYLAND_TOPLEVEL_CONSTRAINED_TOP;
        }
        if (window_state & LIBDECOR_WINDOW_STATE_CONSTRAINED_BOTTOM) {
            wind->toplevel_constraints |= WAYLAND_TOPLEVEL_CONSTRAINED_BOTTOM;
        }
#endif
    }
    const bool floating = !(fullscreen || maximized || tiled);

    UpdateWindowFullscreen(window, fullscreen);

    /* Always send a maximized/restore event; if the event is redundant it will
     * automatically be discarded (see src/events/SDL_windowevents.c)
     *
     * No, we do not get minimize events from libdecor, however, the minimized
     * state can be programmatically set. The meaning of 'minimized' is compositor
     * dependent, but in general, we can assume that the flag should remain set until
     * the next focused configure event occurs.
     */
    if (active || !(window->flags & SDL_WINDOW_MINIMIZED)) {
        if (window->flags & SDL_WINDOW_MINIMIZED) {
            // If we were minimized, send a restored event before possibly sending maximized.
            SDL_SendWindowEvent(window, SDL_EVENT_WINDOW_RESTORED, 0, 0);
        }
        SDL_SendWindowEvent(window,
                            (maximized && !fullscreen) ? SDL_EVENT_WINDOW_MAXIMIZED : SDL_EVENT_WINDOW_RESTORED,
                            0, 0);
    }

    /* For fullscreen or fixed-size windows we know our size.
     * Always assume the configure is wrong.
     */
    if (fullscreen) {
        if (!libdecor_configuration_get_content_size(configuration, frame, &width, &height)) {
            width = wind->requested.logical_width;
            height = wind->requested.logical_height;
        } else {
            // Fullscreen windows know their exact size.
            wind->requested.logical_width = width;
            wind->requested.logical_height = height;

            if (wind->scale_to_display) {
                wind->requested.pixel_width = PointToPixel(window, width);
                wind->requested.pixel_height = PointToPixel(window, height);
            }
        }
    } else {
        if (!(window->flags & SDL_WINDOW_RESIZABLE)) {
            /* If we're a fixed-size window, we know our size for sure.
             * Always assume the configure is wrong.
             */
            if (!wind->scale_to_display) {
                width = wind->requested.logical_width = window->floating.w;
                height = wind->requested.logical_height = window->floating.h;
            } else {
                wind->requested.pixel_width = window->floating.w;
                wind->requested.pixel_height = window->floating.h;
                width = wind->requested.logical_width = PixelToPoint(window, window->floating.w);
                height = wind->requested.logical_height = PixelToPoint(window, window->floating.h);
            }

            OverrideLibdecorLimits(window);
        } else {
            /* XXX: The libdecor cairo plugin sends bogus content sizes that add the
             *      height of the title bar when transitioning from a fixed-size to
             *      floating state. Ignore the sent window dimensions in this case,
             *      in favor of the cached value to avoid the window increasing in
             *      size after every state transition.
             *
             *      https://gitlab.freedesktop.org/libdecor/libdecor/-/issues/34
             */
            if ((floating && (!wind->floating && !(window->flags & SDL_WINDOW_BORDERLESS))) ||
                !libdecor_configuration_get_content_size(configuration, frame, &width, &height)) {
                /* This happens when we're being restored from a non-floating state,
                 * or the compositor indicates that the size is up to the client, so
                 * used the cached window size here.
                 */
                if (floating) {
                    width = window->floating.w;
                    height = window->floating.h;

                    // Clamp the window to the toplevel bounds, if any are set.
                    if (wind->shell_surface_status == WAYLAND_SHELL_SURFACE_STATUS_WAITING_FOR_CONFIGURE &&
                        wind->toplevel_bounds.width && wind->toplevel_bounds.height) {
                        width = SDL_min(wind->toplevel_bounds.width, width);
                        height = SDL_min(wind->toplevel_bounds.height, height);
                    }
                } else {
                    width = window->windowed.w;
                    height = window->windowed.h;
                }

                if (!wind->scale_to_display) {
                    wind->requested.logical_width = width;
                    wind->requested.logical_height = height;
                } else {
                    wind->requested.pixel_width = width;
                    wind->requested.pixel_height = height;
                    width = wind->requested.logical_width = PixelToPoint(window, width);
                    height = wind->requested.logical_height = PixelToPoint(window, height);
                }
            } else {
                /* Don't apply the supplied dimensions if they haven't changed from the last configuration
                 * event, or a newer size set programmatically can be overwritten by old data.
                 *
                 * If a client takes a long time to present the first frame after creating the window, a
                 * configure event to set the suspended state may arrive with the content size increased
                 * by the decoration dimensions, which should also be ignored.
                 */
                if ((width != wind->last_configure.width || height != wind->last_configure.height) &&
                    !(wind->shell_surface_status == WAYLAND_SHELL_SURFACE_STATUS_WAITING_FOR_FRAME && wind->suspended != suspended)) {
                    wind->requested.logical_width = width;
                    wind->requested.logical_height = height;

                    if (wind->scale_to_display) {
                        wind->requested.pixel_width = PointToPixel(window, width);
                        wind->requested.pixel_height = PointToPixel(window, height);
                    }
                }
            }
        }

        /* Notes on the spec:
         *
         * - The content limits are only a hint, which the compositor is free to ignore,
         *   so apply them manually when appropriate.
         *
         * - Maximized windows must have their exact dimensions respected, thus they must
         *   not be resized, or a protocol violation can occur.
         *
         * - When resizing a window, the width/height are maximum values, so aspect ratio
         *   correction can't resize beyond the existing dimensions, or a protocol violation
         *   can occur. In practice, nothing seems to kill clients that do this, but doing
         *   so causes GNOME to glitch out.
         */
        if (!maximized) {
            if (!wind->scale_to_display) {
                if (window->max_w > 0) {
                    wind->requested.logical_width = SDL_min(wind->requested.logical_width, window->max_w);
                }
                wind->requested.logical_width = SDL_max(wind->requested.logical_width, window->min_w);

                if (window->max_h > 0) {
                    wind->requested.logical_height = SDL_min(wind->requested.logical_height, window->max_h);
                }
                wind->requested.logical_height = SDL_max(wind->requested.logical_height, window->min_h);

                // Aspect correction.
                const float aspect = (float)wind->requested.logical_width / (float)wind->requested.logical_height;

                if (window->min_aspect != 0.f && aspect < window->min_aspect) {
                    wind->requested.logical_height = SDL_lroundf((float)wind->requested.logical_width / window->min_aspect);
                } else if (window->max_aspect != 0.f && aspect > window->max_aspect) {
                    wind->requested.logical_width = SDL_lroundf((float)wind->requested.logical_height * window->max_aspect);
                }
            } else {
                if (window->max_w > 0) {
                    wind->requested.pixel_width = SDL_min(wind->requested.pixel_width, window->max_w);
                }
                wind->requested.pixel_width = SDL_max(wind->requested.pixel_width, window->min_w);

                if (window->max_h > 0) {
                    wind->requested.pixel_height = SDL_min(wind->requested.pixel_height, window->max_h);
                }
                wind->requested.pixel_height = SDL_max(wind->requested.pixel_height, window->min_h);

                // Aspect correction.
                const float aspect = (float)wind->requested.pixel_width / (float)wind->requested.pixel_height;

                if (window->min_aspect != 0.f && aspect < window->min_aspect) {
                    wind->requested.pixel_height = SDL_lroundf((float)wind->requested.pixel_width / window->min_aspect);
                } else if (window->max_aspect != 0.f && aspect > window->max_aspect) {
                    wind->requested.pixel_width = SDL_lroundf((float)wind->requested.pixel_height * window->max_aspect);
                }

                wind->requested.logical_width = PixelToPoint(window, wind->requested.pixel_width);
                wind->requested.logical_height = PixelToPoint(window, wind->requested.pixel_height);
            }
        }
    }

    // Store the new state.
    const bool started_resize = !wind->resizing && resizing;
    wind->last_configure.width = width;
    wind->last_configure.height = height;
    wind->floating = floating;
    wind->suspended = suspended;
    wind->active = active;
    window->tiled = tiled;
    wind->resizing = resizing;

    // Update the window manager capabilities.
#if SDL_LIBDECOR_CHECK_VERSION(0, 3, 0)
    enum libdecor_wm_capabilities caps;
#ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_LIBDECOR
    if (libdecor_frame_get_wm_capabilities) {
        caps = libdecor_frame_get_wm_capabilities(wind->shell_surface.libdecor.frame);
#else
    caps = libdecor_frame_get_wm_capabilities(wind->shell_surface.libdecor.frame);
    {
#endif
        wind->wm_caps = 0;
        wind->wm_caps |= caps & LIBDECOR_WM_CAPABILITIES_WINDOW_MENU ? WAYLAND_WM_CAPS_WINDOW_MENU : 0;
        wind->wm_caps |= caps & LIBDECOR_WM_CAPABILITIES_MAXIMIZE ? WAYLAND_WM_CAPS_MAXIMIZE : 0;
        wind->wm_caps |= caps & LIBDECOR_WM_CAPABILITIES_FULLSCREEN ? WAYLAND_WM_CAPS_FULLSCREEN : 0;
        wind->wm_caps |= caps & LIBDECOR_WM_CAPABILITIES_MINIMIZE ? WAYLAND_WM_CAPS_MINIMIZE : 0;
    }
#endif

    if (!wind->resizing || started_resize) {
        /* Calculate the new window geometry and commit the changes on the libdecor side.
         *
         * XXX: This will potentially leave un-acked configurations, but libdecor invalidates the
         *      configuration upon returning from the frame event, so there is nothing that can be
         *      done, unless libdecor adds the ability to copy or refcount the configuration state
         *      to apply later.
         */
        ConfigureWindowGeometry(window);
        struct libdecor_state *state = libdecor_state_new(wind->current.logical_width, wind->current.logical_height);
        libdecor_frame_commit(frame, state, configuration);
        libdecor_state_free(state);
    }

    if (wind->shell_surface_status == WAYLAND_SHELL_SURFACE_STATUS_WAITING_FOR_CONFIGURE) {
        LibdecorGetMinContentSize(frame, &wind->system_limits.min_width, &wind->system_limits.min_height);
        wind->shell_surface_status = WAYLAND_SHELL_SURFACE_STATUS_WAITING_FOR_FRAME;
    }

    /* Update the resize capability if this config event was the result of the
     * compositor taking a window out of fullscreen. Since this will change the
     * capabilities and commit a new frame state with the last known content
     * dimension, this has to be called after the new state has been committed
     * and the new content dimensions were updated.
     */
    if (prev_fullscreen && !wind->is_fullscreen) {
        Wayland_SetWindowResizable(SDL_GetVideoDevice(), window,
                                   !!(window->flags & SDL_WINDOW_RESIZABLE));
    }
}

static void decoration_frame_close(struct libdecor_frame *frame, void *user_data)
{
    SDL_SendWindowEvent(((SDL_WindowData *)user_data)->sdlwindow, SDL_EVENT_WINDOW_CLOSE_REQUESTED, 0, 0);
}

static void decoration_frame_commit(struct libdecor_frame *frame, void *user_data)
{
    /* libdecor decoration subsurfaces are synchronous, so the client needs to
     * commit a frame to trigger an update of the decoration surfaces.
     */
    SDL_WindowData *wind = (SDL_WindowData *)user_data;
    if (!wind->suspended && wind->shell_surface_status == WAYLAND_SHELL_SURFACE_STATUS_SHOWN) {
        SDL_SendWindowEvent(wind->sdlwindow, SDL_EVENT_WINDOW_EXPOSED, 0, 0);
    }
}

static void decoration_dismiss_popup(struct libdecor_frame *frame, const char *seat_name, void *user_data)
{
    // NOP
}

#if SDL_LIBDECOR_CHECK_VERSION(0, 3, 0)
static void decoration_frame_bounds(struct libdecor_frame *frame, int width, int height, void *user_data)
{
    SDL_WindowData *window = (SDL_WindowData *)user_data;
    window->toplevel_bounds.width = width;
    window->toplevel_bounds.height = height;
}
#endif

static struct libdecor_frame_interface libdecor_frame_interface = {
    decoration_frame_configure,
    decoration_frame_close,
    decoration_frame_commit,
    decoration_dismiss_popup,
#if SDL_LIBDECOR_CHECK_VERSION(0, 3, 0)
    decoration_frame_bounds
#endif
};
#endif

static void Wayland_HandlePreferredScaleChanged(SDL_WindowData *window_data, double factor)
{
    const double old_factor = window_data->scale_factor;

    // Round the scale factor if viewports aren't available.
    if (!window_data->viewport) {
        factor = SDL_ceil(factor);
    }

    if (factor != old_factor) {
        window_data->scale_factor = factor;

        if (window_data->scale_to_display) {
            /* If the window is in the floating state with a user/application specified size, calculate the new
             * logical size from the backbuffer size. Otherwise, use the fixed underlying logical size to calculate
             * the new backbuffer dimensions.
             */
            if (window_data->floating) {
                window_data->requested.logical_width = PixelToPoint(window_data->sdlwindow, window_data->requested.pixel_width);
                window_data->requested.logical_height = PixelToPoint(window_data->sdlwindow, window_data->requested.pixel_height);
            } else {
                window_data->requested.pixel_width = PointToPixel(window_data->sdlwindow, window_data->requested.logical_width);
                window_data->requested.pixel_height = PointToPixel(window_data->sdlwindow, window_data->requested.logical_height);
            }
        }

        if (window_data->sdlwindow->flags & SDL_WINDOW_HIGH_PIXEL_DENSITY || window_data->scale_to_display) {
            ConfigureWindowGeometry(window_data->sdlwindow);
            CommitLibdecorFrame(window_data->sdlwindow);
        }
    }
}

static void Wayland_MaybeUpdateScaleFactor(SDL_WindowData *window)
{
    double factor;
    int i;

    /* If the fractional scale protocol is present or the core protocol supports the
     * preferred buffer scale event, the compositor will explicitly tell the application
     * what scale it wants via these events, so don't try to determine the scale factor
     * from which displays the surface has entered.
     */
    if (window->fractional_scale || wl_surface_get_version(window->surface) >= WL_SURFACE_PREFERRED_BUFFER_SCALE_SINCE_VERSION) {
        return;
    }

    if (window->num_outputs != 0) {
        // Check every display's factor, use the highest
        factor = 0.0;
        for (i = 0; i < window->num_outputs; i++) {
            SDL_DisplayData *internal = window->outputs[i];
            factor = SDL_max(factor, internal->scale_factor);
        }
    } else {
        // All outputs removed, just fall back.
        factor = window->scale_factor;
    }

    Wayland_HandlePreferredScaleChanged(window, factor);
}

void Wayland_RemoveOutputFromWindow(SDL_WindowData *window, SDL_DisplayData *display_data)
{
    for (int i = 0; i < window->num_outputs; i++) {
        if (window->outputs[i] == display_data) { // remove this one
            if (i == (window->num_outputs - 1)) {
                window->outputs[i] = NULL;
            } else {
                SDL_memmove(&window->outputs[i],
                            &window->outputs[i + 1],
                            sizeof(SDL_DisplayData *) * ((window->num_outputs - i) - 1));
            }
            window->num_outputs--;
            i--;
        }
    }

    if (window->num_outputs == 0) {
        SDL_free(window->outputs);
        window->outputs = NULL;
    } else if (!window->is_fullscreen || window->num_outputs == 1) {
        Wayland_move_window(window->sdlwindow);
        Wayland_MaybeUpdateScaleFactor(window);
    }
}

static void handle_surface_enter(void *data, struct wl_surface *surface, struct wl_output *output)
{
    SDL_WindowData *window = data;
    SDL_DisplayData *internal = wl_output_get_user_data(output);
    SDL_DisplayData **new_outputs;

    if (!SDL_WAYLAND_own_output(output) || !SDL_WAYLAND_own_surface(surface)) {
        return;
    }

    new_outputs = SDL_realloc(window->outputs,
                              sizeof(SDL_DisplayData *) * (window->num_outputs + 1));
    if (!new_outputs) {
        return;
    }
    window->outputs = new_outputs;
    window->outputs[window->num_outputs++] = internal;

    // Update the scale factor after the move so that fullscreen outputs are updated.
    if (!window->is_fullscreen || window->num_outputs == 1) {
        Wayland_move_window(window->sdlwindow);
        Wayland_MaybeUpdateScaleFactor(window);
    }
}

static void handle_surface_leave(void *data, struct wl_surface *surface, struct wl_output *output)
{
    SDL_WindowData *window = (SDL_WindowData *)data;

    if (!SDL_WAYLAND_own_output(output) || !SDL_WAYLAND_own_surface(surface)) {
        return;
    }

    Wayland_RemoveOutputFromWindow(window, (SDL_DisplayData *)wl_output_get_user_data(output));
}

static void handle_surface_preferred_buffer_scale(void *data, struct wl_surface *wl_surface, int32_t factor)
{
    SDL_WindowData *wind = data;

    /* The spec is unclear on how this interacts with the fractional scaling protocol,
     * so, for now, assume that the fractional scaling protocol takes priority and
     * only listen to this event if the fractional scaling protocol is not present.
     */
    if (!wind->fractional_scale) {
        Wayland_HandlePreferredScaleChanged(data, (double)factor);
    }
}

static void handle_surface_preferred_buffer_transform(void *data, struct wl_surface *wl_surface, uint32_t transform)
{
    // Nothing to do here.
}

static const struct wl_surface_listener surface_listener = {
    handle_surface_enter,
    handle_surface_leave,
    handle_surface_preferred_buffer_scale,
    handle_surface_preferred_buffer_transform
};

static void handle_fractional_scale_preferred(void *data, struct wp_fractional_scale_v1 *wp_fractional_scale_v1, uint32_t scale)
{
    const double factor = (double)scale / 120.; // 120 is a magic number defined in the spec as a common denominator
    Wayland_HandlePreferredScaleChanged(data, factor);
}

static const struct wp_fractional_scale_v1_listener fractional_scale_listener = {
    handle_fractional_scale_preferred
};

static void frog_preferred_metadata_handler(void *data, struct frog_color_managed_surface *frog_color_managed_surface, uint32_t transfer_function,
                                            uint32_t output_display_primary_red_x, uint32_t output_display_primary_red_y,
                                            uint32_t output_display_primary_green_x, uint32_t output_display_primary_green_y,
                                            uint32_t output_display_primary_blue_x, uint32_t output_display_primary_blue_y,
                                            uint32_t output_white_point_x, uint32_t output_white_point_y,
                                            uint32_t max_luminance, uint32_t min_luminance,
                                            uint32_t max_full_frame_luminance)
{
    SDL_WindowData *wind = (SDL_WindowData *)data;
    SDL_HDROutputProperties HDR;

    SDL_zero(HDR);

    switch (transfer_function) {
    case FROG_COLOR_MANAGED_SURFACE_TRANSFER_FUNCTION_ST2084_PQ:
        /* ITU-R BT.2408-7 (Sept 2023) has the reference PQ white level at 203 nits,
         * while older Dolby documentation claims a reference level of 100 nits.
         *
         * Use 203 nits for now.
         */
        HDR.HDR_headroom = max_luminance / 203.0f;
        break;
    case FROG_COLOR_MANAGED_SURFACE_TRANSFER_FUNCTION_SCRGB_LINEAR:
        HDR.HDR_headroom = max_luminance / 80.0f;
        break;
    case FROG_COLOR_MANAGED_SURFACE_TRANSFER_FUNCTION_UNDEFINED:
    case FROG_COLOR_MANAGED_SURFACE_TRANSFER_FUNCTION_SRGB:
    case FROG_COLOR_MANAGED_SURFACE_TRANSFER_FUNCTION_GAMMA_22:
    default:
        HDR.HDR_headroom = 1.0f;
        break;
    }

    HDR.SDR_white_level = 1.0f;
    SDL_SetWindowHDRProperties(wind->sdlwindow, &HDR, true);
}

static const struct frog_color_managed_surface_listener frog_surface_listener = {
    frog_preferred_metadata_handler
};


static void handle_surface_feedback_preferred_changed2(void *data,
                                                       struct wp_color_management_surface_feedback_v1 *wp_color_management_surface_feedback_v1,
                                                       uint32_t identity_hi, uint32_t identity_lo)
{
    SDL_WindowData *wind = (SDL_WindowData *)data;
    Wayland_GetColorInfoForWindow(wind, false);
}

static void handle_surface_feedback_preferred_changed(void *data,
                                                      struct wp_color_management_surface_feedback_v1 *wp_color_management_surface_feedback_v1,
                                                      uint32_t identity)
{
    handle_surface_feedback_preferred_changed2(data, wp_color_management_surface_feedback_v1, 0, identity);
}

static const struct wp_color_management_surface_feedback_v1_listener color_management_surface_feedback_listener = {
    handle_surface_feedback_preferred_changed,
    handle_surface_feedback_preferred_changed2
};

static void Wayland_SetKeyboardFocus(SDL_Window *window, bool set_focus)
{
    SDL_Window *toplevel = window;

    // Find the toplevel parent
    while (SDL_WINDOW_IS_POPUP(toplevel)) {
        toplevel = toplevel->parent;
    }

    toplevel->keyboard_focus = window;

    if (set_focus && !window->is_hiding && !window->is_destroying) {
        SDL_SetKeyboardFocus(window);
    }
}

bool Wayland_SetWindowHitTest(SDL_Window *window, bool enabled)
{
    return true; // just succeed, the real work is done elsewhere.
}

static struct xdg_toplevel *GetToplevelForWindow(SDL_WindowData *wind)
{
    if (wind) {
        /* Libdecor crashes on attempts to unset the parent by passing null, which is allowed by the
         * toplevel spec, so just use the raw xdg-toplevel instead (that's what libdecor does
         * internally anyways).
         */
#ifdef HAVE_LIBDECOR_H
        if (wind->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_LIBDECOR && wind->shell_surface.libdecor.frame) {
            return libdecor_frame_get_xdg_toplevel(wind->shell_surface.libdecor.frame);
        } else
#endif
            if (wind->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_XDG_TOPLEVEL && wind->shell_surface.xdg.toplevel.xdg_toplevel) {
                return wind->shell_surface.xdg.toplevel.xdg_toplevel;
            }
    }

    return NULL;
}

bool Wayland_SetWindowParent(SDL_VideoDevice *_this, SDL_Window *window, SDL_Window *parent_window)
{
    SDL_WindowData *child_data = window->internal;
    SDL_WindowData *parent_data = parent_window ? parent_window->internal : NULL;

    child_data->reparenting_required = false;

    if (parent_data && parent_data->shell_surface_status != WAYLAND_SHELL_SURFACE_STATUS_SHOWN) {
        // Need to wait for the parent to become mapped, or it's the same as setting a null parent.
        child_data->reparenting_required = true;
        return true;
    }

    struct xdg_toplevel *child_toplevel = GetToplevelForWindow(child_data);
    struct xdg_toplevel *parent_toplevel = GetToplevelForWindow(parent_data);

    if (child_toplevel) {
        xdg_toplevel_set_parent(child_toplevel, parent_toplevel);
    }

    return true;
}

bool Wayland_SetWindowModal(SDL_VideoDevice *_this, SDL_Window *window, bool modal)
{
    SDL_VideoData *viddata = _this->internal;
    SDL_WindowData *data = window->internal;
    SDL_WindowData *parent_data = window->parent->internal;

    if (parent_data->shell_surface_status != WAYLAND_SHELL_SURFACE_STATUS_SHOWN) {
        // Need to wait for the parent to become mapped before changing modal status.
        data->reparenting_required = true;
        return true;
    } else {
        data->reparenting_required = false;
    }

    struct xdg_toplevel *toplevel = GetToplevelForWindow(data);

    if (toplevel) {
        if (viddata->xdg_wm_dialog_v1) {
            if (modal) {
                if (!data->xdg_dialog_v1) {
                    data->xdg_dialog_v1 = xdg_wm_dialog_v1_get_xdg_dialog(viddata->xdg_wm_dialog_v1, toplevel);
                }

                xdg_dialog_v1_set_modal(data->xdg_dialog_v1);
            } else if (data->xdg_dialog_v1) {
                xdg_dialog_v1_unset_modal(data->xdg_dialog_v1);
            }
        }
    }

    return true;
}

static void show_hide_sync_handler(void *data, struct wl_callback *callback, uint32_t callback_data)
{
    // Get the window from the ID as it may have been destroyed
    SDL_WindowID windowID = (SDL_WindowID)((uintptr_t)data);
    SDL_Window *window = SDL_GetWindowFromID(windowID);

    if (window && window->internal) {
        SDL_WindowData *wind = window->internal;
        wind->show_hide_sync_required = false;
    }

    wl_callback_destroy(callback);
}

static struct wl_callback_listener show_hide_sync_listener = {
    show_hide_sync_handler
};

static void exported_handle_handler(void *data, struct zxdg_exported_v2 *zxdg_exported_v2, const char *handle)
{
    SDL_WindowData *wind = (SDL_WindowData *)data;
    SDL_PropertiesID props = SDL_GetWindowProperties(wind->sdlwindow);

    SDL_SetStringProperty(props, SDL_PROP_WINDOW_WAYLAND_XDG_TOPLEVEL_EXPORT_HANDLE_STRING, handle);
}

static struct zxdg_exported_v2_listener exported_v2_listener = {
    exported_handle_handler
};

void Wayland_ShowWindow(SDL_VideoDevice *_this, SDL_Window *window)
{
    SDL_VideoData *c = _this->internal;
    SDL_WindowData *data = window->internal;
    SDL_PropertiesID props = SDL_GetWindowProperties(window);

    // Custom surfaces don't get toplevels and are always considered 'shown'; nothing to do here.
    if (data->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_CUSTOM) {
        return;
    }

    /* If this is a child window, the parent *must* be in the final shown state,
     * meaning that it has received a configure event, followed by a frame callback.
     * If not, a race condition can result, with effects ranging from the child
     * window to spuriously closing to protocol errors.
     *
     * If waiting on the parent window, set the pending status and the window will
     * be shown when the parent is in the shown state.
     */
    if (window->parent) {
        if (window->parent->internal->shell_surface_status != WAYLAND_SHELL_SURFACE_STATUS_SHOWN) {
            data->shell_surface_status = WAYLAND_SHELL_SURFACE_STATUS_SHOW_PENDING;
            return;
        }
    }

    // Always roundtrip to ensure there are no pending buffer attachments.
    do {
        WAYLAND_wl_display_roundtrip(c->display);
    } while (data->show_hide_sync_required);

    data->shell_surface_status = WAYLAND_SHELL_SURFACE_STATUS_WAITING_FOR_CONFIGURE;

    /* Detach any previous buffers before resetting everything, otherwise when
     * calling this a second time you'll get an annoying protocol error!
     *
     * FIXME: This was originally moved to HideWindow, which _should_ make
     * sense, but for whatever reason UE5's popups require that this actually
     * be in both places at once? Possibly from renderers making commits? I can't
     * fully remember if this location caused crashes or if I was fixing a pair
     * of Hide/Show calls. In any case, UE gives us a pretty good test and having
     * both detach calls passes. This bug may be relevant if I'm wrong:
     *
     * https://bugs.kde.org/show_bug.cgi?id=448856
     *
     * -flibit
     */
    wl_surface_attach(data->surface, NULL, 0, 0);
    wl_surface_commit(data->surface);

    // Create the shell surface and map the toplevel/popup
#ifdef HAVE_LIBDECOR_H
    if (data->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_LIBDECOR) {
        data->shell_surface.libdecor.frame = libdecor_decorate(c->shell.libdecor,
                                                               data->surface,
                                                               &libdecor_frame_interface,
                                                               data);
        if (!data->shell_surface.libdecor.frame) {
            SDL_LogError(SDL_LOG_CATEGORY_VIDEO, "Failed to create libdecor frame!");
        } else {
            libdecor_frame_set_app_id(data->shell_surface.libdecor.frame, data->app_id);
            libdecor_frame_map(data->shell_surface.libdecor.frame);
            if (window->flags & SDL_WINDOW_BORDERLESS) {
                // Note: Calling this with 'true' immediately after mapping will cause the libdecor Cairo plugin to crash.
                libdecor_frame_set_visibility(data->shell_surface.libdecor.frame, false);
            }

            if (c->zxdg_exporter_v2) {
                data->exported = zxdg_exporter_v2_export_toplevel(c->zxdg_exporter_v2, data->surface);
                zxdg_exported_v2_add_listener(data->exported, &exported_v2_listener, data);
            }

            if (c->xdg_toplevel_icon_manager_v1 && data->xdg_toplevel_icon_v1) {
                xdg_toplevel_icon_manager_v1_set_icon(_this->internal->xdg_toplevel_icon_manager_v1,
                                                      libdecor_frame_get_xdg_toplevel(data->shell_surface.libdecor.frame),
                                                      data->xdg_toplevel_icon_v1);
            }

            SDL_SetPointerProperty(props, SDL_PROP_WINDOW_WAYLAND_XDG_SURFACE_POINTER, libdecor_frame_get_xdg_surface(data->shell_surface.libdecor.frame));
            SDL_SetPointerProperty(props, SDL_PROP_WINDOW_WAYLAND_XDG_TOPLEVEL_POINTER, libdecor_frame_get_xdg_toplevel(data->shell_surface.libdecor.frame));
        }
    } else
#endif
    if (data->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_XDG_TOPLEVEL || data->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_XDG_POPUP) {
        data->shell_surface.xdg.surface = xdg_wm_base_get_xdg_surface(c->shell.xdg, data->surface);
        xdg_surface_set_user_data(data->shell_surface.xdg.surface, data);
        xdg_surface_add_listener(data->shell_surface.xdg.surface, &_xdg_surface_listener, data);
        SDL_SetPointerProperty(SDL_GetWindowProperties(window), SDL_PROP_WINDOW_WAYLAND_XDG_SURFACE_POINTER, data->shell_surface.xdg.surface);

        if (data->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_XDG_POPUP) {
            SDL_Window *parent = window->parent;
            SDL_WindowData *parent_data = parent->internal;
            struct xdg_surface *parent_xdg_surface = NULL;
            int position_x = 0, position_y = 0;

            // Configure the popup parameters
#ifdef HAVE_LIBDECOR_H
            if (parent_data->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_LIBDECOR) {
                parent_xdg_surface = libdecor_frame_get_xdg_surface(parent_data->shell_surface.libdecor.frame);
            } else
#endif
            if (parent_data->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_XDG_TOPLEVEL ||
                    parent_data->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_XDG_POPUP) {
                parent_xdg_surface = parent_data->shell_surface.xdg.surface;
            }

            // Set up the positioner for the popup and configure the constraints
            data->shell_surface.xdg.popup.xdg_positioner = xdg_wm_base_create_positioner(c->shell.xdg);
            xdg_positioner_set_anchor(data->shell_surface.xdg.popup.xdg_positioner, XDG_POSITIONER_ANCHOR_TOP_LEFT);
            xdg_positioner_set_anchor_rect(data->shell_surface.xdg.popup.xdg_positioner, 0, 0, parent->internal->current.logical_width, parent->internal->current.logical_height);

            const Uint32 constraint = window->constrain_popup ? (XDG_POSITIONER_CONSTRAINT_ADJUSTMENT_SLIDE_X | XDG_POSITIONER_CONSTRAINT_ADJUSTMENT_SLIDE_Y) : XDG_POSITIONER_CONSTRAINT_ADJUSTMENT_NONE;
            xdg_positioner_set_constraint_adjustment(data->shell_surface.xdg.popup.xdg_positioner, constraint);
            xdg_positioner_set_gravity(data->shell_surface.xdg.popup.xdg_positioner, XDG_POSITIONER_GRAVITY_BOTTOM_RIGHT);
            xdg_positioner_set_size(data->shell_surface.xdg.popup.xdg_positioner, data->current.logical_width, data->current.logical_height);

            // Set the popup initial position
            position_x = window->last_position_pending ? window->pending.x : window->x;
            position_y = window->last_position_pending ? window->pending.y : window->y;
            EnsurePopupPositionIsValid(window, &position_x, &position_y);
            if (data->scale_to_display) {
                position_x = PixelToPoint(window->parent, position_x);
                position_y = PixelToPoint(window->parent, position_y);
            }
            AdjustPopupOffset(window, &position_x, &position_y);
            xdg_positioner_set_offset(data->shell_surface.xdg.popup.xdg_positioner, position_x, position_y);

            // Assign the popup role
            data->shell_surface.xdg.popup.xdg_popup = xdg_surface_get_popup(data->shell_surface.xdg.surface,
                                                                                parent_xdg_surface,
                                                                                data->shell_surface.xdg.popup.xdg_positioner);
            xdg_popup_add_listener(data->shell_surface.xdg.popup.xdg_popup, &_xdg_popup_listener, data);

            if (window->flags & SDL_WINDOW_TOOLTIP) {
                struct wl_region *region;

                // Tooltips can't be interacted with, so turn off the input region to avoid blocking anything behind them
                region = wl_compositor_create_region(c->compositor);
                wl_region_add(region, 0, 0, 0, 0);
                wl_surface_set_input_region(data->surface, region);
                wl_region_destroy(region);
            } else if ((window->flags & SDL_WINDOW_POPUP_MENU) && !(window->flags & SDL_WINDOW_NOT_FOCUSABLE)) {
                Wayland_SetKeyboardFocus(window, true);
            }

            SDL_SetPointerProperty(props, SDL_PROP_WINDOW_WAYLAND_XDG_POPUP_POINTER, data->shell_surface.xdg.popup.xdg_popup);
            SDL_SetPointerProperty(props, SDL_PROP_WINDOW_WAYLAND_XDG_POSITIONER_POINTER, data->shell_surface.xdg.popup.xdg_positioner);
        } else {
            data->shell_surface.xdg.toplevel.xdg_toplevel = xdg_surface_get_toplevel(data->shell_surface.xdg.surface);
            xdg_toplevel_set_app_id(data->shell_surface.xdg.toplevel.xdg_toplevel, data->app_id);
            xdg_toplevel_add_listener(data->shell_surface.xdg.toplevel.xdg_toplevel, &toplevel_listener_xdg, data);

            // Create the window decorations
            if (c->decoration_manager) {
                data->server_decoration = zxdg_decoration_manager_v1_get_toplevel_decoration(c->decoration_manager, data->shell_surface.xdg.toplevel.xdg_toplevel);
                zxdg_toplevel_decoration_v1_add_listener(data->server_decoration, &xdg_toplevel_decoration_listener, window);
                const enum zxdg_toplevel_decoration_v1_mode mode = !(window->flags & SDL_WINDOW_BORDERLESS) ? ZXDG_TOPLEVEL_DECORATION_V1_MODE_SERVER_SIDE : ZXDG_TOPLEVEL_DECORATION_V1_MODE_CLIENT_SIDE;
                zxdg_toplevel_decoration_v1_set_mode(data->server_decoration, mode);
            }

            if (c->zxdg_exporter_v2) {
                data->exported = zxdg_exporter_v2_export_toplevel(c->zxdg_exporter_v2, data->surface);
                zxdg_exported_v2_add_listener(data->exported, &exported_v2_listener, data);
            }

            if (c->xdg_toplevel_icon_manager_v1 && data->xdg_toplevel_icon_v1) {
                xdg_toplevel_icon_manager_v1_set_icon(_this->internal->xdg_toplevel_icon_manager_v1,
                                                      data->shell_surface.xdg.toplevel.xdg_toplevel,
                                                      data->xdg_toplevel_icon_v1);
            }

            SDL_SetPointerProperty(props, SDL_PROP_WINDOW_WAYLAND_XDG_TOPLEVEL_POINTER, data->shell_surface.xdg.toplevel.xdg_toplevel);
        }
    }

    // Restore state that was set prior to this call
    Wayland_SetWindowParent(_this, window, window->parent);

    if (window->flags & SDL_WINDOW_MODAL) {
        Wayland_SetWindowModal(_this, window, true);
    }

    Wayland_SetWindowTitle(_this, window);

    /* We have to wait until the surface gets a "configure" event, or use of
     * this surface will fail. This is a new rule for xdg_shell.
     */
#ifdef HAVE_LIBDECOR_H
    if (data->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_LIBDECOR) {
        if (data->shell_surface.libdecor.frame) {
            while (data->shell_surface_status == WAYLAND_SHELL_SURFACE_STATUS_WAITING_FOR_CONFIGURE) {
                if (libdecor_dispatch(c->shell.libdecor, -1) < 0) {
                    if (!Wayland_HandleDisplayDisconnected(_this)) {
                        return;
                    }
                }
                if (WAYLAND_wl_display_dispatch_pending(c->display) < 0) {
                    if (!Wayland_HandleDisplayDisconnected(_this)) {
                        return;
                    }
                }
            }
        }
    } else
#endif
        if (data->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_XDG_POPUP || data->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_XDG_TOPLEVEL) {
        /* Unlike libdecor we need to call this explicitly to prevent a deadlock.
         * libdecor will call this as part of their configure event!
         * -flibit
         */
        wl_surface_commit(data->surface);
        if (data->shell_surface.xdg.surface) {
            while (data->shell_surface_status == WAYLAND_SHELL_SURFACE_STATUS_WAITING_FOR_CONFIGURE) {
                if (WAYLAND_wl_display_dispatch(c->display) < 0) {
                    if (!Wayland_HandleDisplayDisconnected(_this)) {
                        return;
                    }
                }
            }
        }
    } else {
        // Nothing to see here, just commit.
        wl_surface_commit(data->surface);
    }

    // Make sure the window can't be resized to 0 or it can be spuriously closed by the window manager.
    data->system_limits.min_width = SDL_max(data->system_limits.min_width, 1);
    data->system_limits.min_height = SDL_max(data->system_limits.min_height, 1);

    /* Unlike the rest of window state we have to set this _after_ flushing the
     * display, because we need to create the decorations before possibly hiding
     * them immediately afterward.
     */
#ifdef HAVE_LIBDECOR_H
    if (data->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_LIBDECOR) {
        // Libdecor plugins can enforce minimum window sizes, so adjust if the initial window size is too small.
        if (window->windowed.w < data->system_limits.min_width ||
            window->windowed.h < data->system_limits.min_height) {

            // Warn if the window frame will be larger than the content surface.
            SDL_LogWarn(SDL_LOG_CATEGORY_VIDEO,
                        "Window dimensions (%i, %i) are smaller than the system enforced minimum (%i, %i); window borders will be larger than the content surface.",
                        window->windowed.w, window->windowed.h, data->system_limits.min_width, data->system_limits.min_height);

            data->current.logical_width = SDL_max(window->windowed.w, data->system_limits.min_width);
            data->current.logical_height = SDL_max(window->windowed.h, data->system_limits.min_height);
            CommitLibdecorFrame(window);
        }
    }
#endif
    Wayland_SetWindowResizable(_this, window, !!(window->flags & SDL_WINDOW_RESIZABLE));

    // We're finally done putting the window together, raise if possible
    if (c->activation_manager) {
        /* Note that we don't check for empty strings, as that is still
         * considered a valid activation token!
         */
        const char *activation_token = SDL_getenv("XDG_ACTIVATION_TOKEN");
        if (activation_token) {
            xdg_activation_v1_activate(c->activation_manager,
                                       activation_token,
                                       data->surface);

            // Clear this variable, per the protocol's request
            SDL_unsetenv_unsafe("XDG_ACTIVATION_TOKEN");
        }
    }

    data->show_hide_sync_required = true;
    struct wl_callback *cb = wl_display_sync(_this->internal->display);
    wl_callback_add_listener(cb, &show_hide_sync_listener, (void *)((uintptr_t)window->id));

    data->showing_window = true;
    SDL_SendWindowEvent(window, SDL_EVENT_WINDOW_SHOWN, 0, 0);
    data->showing_window = false;

    // Send an exposure event to signal that the client should draw.
    if (data->shell_surface_status == WAYLAND_SHELL_SURFACE_STATUS_WAITING_FOR_FRAME) {
        SDL_SendWindowEvent(window, SDL_EVENT_WINDOW_EXPOSED, 0, 0);
    }
}

static void Wayland_ReleasePopup(SDL_VideoDevice *_this, SDL_Window *popup)
{
    SDL_WindowData *popupdata;

    // Basic sanity checks to weed out the weird popup closures
    if (!SDL_ObjectValid(popup, SDL_OBJECT_TYPE_WINDOW)) {
        return;
    }
    popupdata = popup->internal;
    if (!popupdata) {
        return;
    }

    // This may already be freed by a parent popup!
    if (popupdata->shell_surface.xdg.popup.xdg_popup == NULL) {
        return;
    }

    if ((popup->flags & SDL_WINDOW_POPUP_MENU) && !(popup->flags & SDL_WINDOW_NOT_FOCUSABLE)) {
        SDL_Window *new_focus;
        const bool set_focus = SDL_ShouldRelinquishPopupFocus(popup, &new_focus);
        Wayland_SetKeyboardFocus(new_focus, set_focus);
    }

    xdg_popup_destroy(popupdata->shell_surface.xdg.popup.xdg_popup);
    xdg_positioner_destroy(popupdata->shell_surface.xdg.popup.xdg_positioner);
    popupdata->shell_surface.xdg.popup.xdg_popup = NULL;
    popupdata->shell_surface.xdg.popup.xdg_positioner = NULL;

    SDL_PropertiesID props = SDL_GetWindowProperties(popup);
    SDL_SetPointerProperty(props, SDL_PROP_WINDOW_WAYLAND_XDG_POPUP_POINTER, NULL);
    SDL_SetPointerProperty(props, SDL_PROP_WINDOW_WAYLAND_XDG_POSITIONER_POINTER, NULL);
}

void Wayland_HideWindow(SDL_VideoDevice *_this, SDL_Window *window)
{
    SDL_VideoData *data = _this->internal;
    SDL_WindowData *wind = window->internal;
    SDL_PropertiesID props = SDL_GetWindowProperties(window);

    // Custom surfaces have nothing to destroy and are always considered to be 'shown'; nothing to do here.
    if (wind->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_CUSTOM) {
        return;
    }

    /* The window was shown, but the sync point hasn't yet been reached.
     * Pump events to avoid a possible protocol violation.
     */
    if (wind->show_hide_sync_required) {
        WAYLAND_wl_display_roundtrip(data->display);
    }

    wind->shell_surface_status = WAYLAND_SHELL_SURFACE_STATUS_HIDDEN;

    if (wind->server_decoration) {
        zxdg_toplevel_decoration_v1_destroy(wind->server_decoration);
        wind->server_decoration = NULL;
    }

    // Clean up the export handle.
    if (wind->exported) {
        zxdg_exported_v2_destroy(wind->exported);
        wind->exported = NULL;

        SDL_SetStringProperty(props, SDL_PROP_WINDOW_WAYLAND_XDG_TOPLEVEL_EXPORT_HANDLE_STRING, NULL);
    }

    if (wind->xdg_dialog_v1) {
        xdg_dialog_v1_destroy(wind->xdg_dialog_v1);
        wind->xdg_dialog_v1 = NULL;
    }

#ifdef HAVE_LIBDECOR_H
    if (wind->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_LIBDECOR) {
        if (wind->shell_surface.libdecor.frame) {
            libdecor_frame_unref(wind->shell_surface.libdecor.frame);

            SDL_SetPointerProperty(props, SDL_PROP_WINDOW_WAYLAND_XDG_SURFACE_POINTER, NULL);
            SDL_SetPointerProperty(props, SDL_PROP_WINDOW_WAYLAND_XDG_TOPLEVEL_POINTER, NULL);
        }
    } else
#endif
    {
        if (wind->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_XDG_POPUP) {
            Wayland_ReleasePopup(_this, window);
        } else if (wind->shell_surface.xdg.toplevel.xdg_toplevel) {
            xdg_toplevel_destroy(wind->shell_surface.xdg.toplevel.xdg_toplevel);
            SDL_SetPointerProperty(props, SDL_PROP_WINDOW_WAYLAND_XDG_TOPLEVEL_POINTER, NULL);
        }

        if (wind->shell_surface.xdg.surface) {
            xdg_surface_destroy(wind->shell_surface.xdg.surface);
            SDL_SetPointerProperty(props, SDL_PROP_WINDOW_WAYLAND_XDG_SURFACE_POINTER, NULL);
        }
    }

    // Attach a null buffer to unmap the surface.
    wl_surface_attach(wind->surface, NULL, 0, 0);
    wl_surface_commit(wind->surface);

    SDL_zero(wind->shell_surface);
    wind->show_hide_sync_required = true;
    struct wl_callback *cb = wl_display_sync(_this->internal->display);
    wl_callback_add_listener(cb, &show_hide_sync_listener, (void *)((uintptr_t)window->id));
}

static void handle_xdg_activation_done(void *data,
                                       struct xdg_activation_token_v1 *xdg_activation_token_v1,
                                       const char *token)
{
    SDL_WindowData *window = data;
    if (xdg_activation_token_v1 == window->activation_token) {
        xdg_activation_v1_activate(window->waylandData->activation_manager,
                                   token,
                                   window->surface);
        xdg_activation_token_v1_destroy(window->activation_token);
        window->activation_token = NULL;
    }
}

static const struct xdg_activation_token_v1_listener xdg_activation_listener = {
    handle_xdg_activation_done
};

/* The xdg-activation protocol considers "activation" to be one of two things:
 *
 * 1: Raising a window to the top and flashing the titlebar
 * 2: Flashing the titlebar while keeping the window where it is
 *
 * As you might expect from Wayland, the general policy is to go with #2 unless
 * the client can prove to the compositor beyond a reasonable doubt that raising
 * the window will not be malicious behavior.
 *
 * For SDL this means RaiseWindow and FlashWindow both use the same protocol,
 * but in different ways: RaiseWindow will provide as _much_ information as
 * possible while FlashWindow will provide as _little_ information as possible,
 * to nudge the compositor into doing what we want.
 *
 * This isn't _strictly_ what the protocol says will happen, but this is what
 * current implementations are doing (as of writing, YMMV in the far distant
 * future).
 *
 * -flibit
 */
static void Wayland_activate_window(SDL_VideoData *data, SDL_WindowData *target_wind, bool set_serial)
{
    SDL_WaylandSeat *seat = data->last_implicit_grab_seat;
    SDL_WindowData *focus = NULL;

    if (seat) {
        focus = seat->keyboard.focus;
        if (!focus) {
            focus = seat->pointer.focus;
        }
    }

    struct wl_surface *requesting_surface = focus ? focus->surface : NULL;

    if (data->activation_manager) {
        if (target_wind->activation_token) {
            // We're about to overwrite this with a new request
            xdg_activation_token_v1_destroy(target_wind->activation_token);
        }

        target_wind->activation_token = xdg_activation_v1_get_activation_token(data->activation_manager);
        xdg_activation_token_v1_add_listener(target_wind->activation_token,
                                             &xdg_activation_listener,
                                             target_wind);

        /* Note that we are not setting the app_id here.
         *
         * Hypothetically we could set the app_id from data->classname, but
         * that part of the API is for _external_ programs, not ourselves.
         *
         * -flibit
         */
        if (requesting_surface) {
            // This specifies the surface from which the activation request is originating, not the activation target surface.
            xdg_activation_token_v1_set_surface(target_wind->activation_token, requesting_surface);
        }
        if (set_serial && seat && seat->wl_seat) {
            xdg_activation_token_v1_set_serial(target_wind->activation_token, seat->last_implicit_grab_serial, seat->wl_seat);
        }
        xdg_activation_token_v1_commit(target_wind->activation_token);
    }
}

void Wayland_RaiseWindow(SDL_VideoDevice *_this, SDL_Window *window)
{
    Wayland_activate_window(_this->internal, window->internal, true);
}

bool Wayland_FlashWindow(SDL_VideoDevice *_this, SDL_Window *window, SDL_FlashOperation operation)
{
    /* Not setting the serial will specify 'urgency' without switching focus as per
     * https://gitlab.freedesktop.org/wayland/wayland-protocols/-/merge_requests/9#note_854977
     */
    Wayland_activate_window(_this->internal, window->internal, false);
    return true;
}

SDL_FullscreenResult Wayland_SetWindowFullscreen(SDL_VideoDevice *_this, SDL_Window *window,
                                 SDL_VideoDisplay *display, SDL_FullscreenOp fullscreen)
{
    SDL_WindowData *wind = window->internal;
    struct wl_output *output = display->internal->output;

    // Custom surfaces have no toplevel to make fullscreen.
    if (wind->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_CUSTOM) {
        return SDL_FULLSCREEN_FAILED;
    }

    // Drop fullscreen leave requests when showing the window.
    if (wind->showing_window && fullscreen == SDL_FULLSCREEN_OP_LEAVE) {
        return SDL_FULLSCREEN_SUCCEEDED;
    }

    if (wind->show_hide_sync_required) {
        WAYLAND_wl_display_roundtrip(_this->internal->display);
    }

    // Flushing old events pending a new one, ignore this request.
    if (wind->drop_fullscreen_requests) {
        return SDL_FULLSCREEN_SUCCEEDED;
    }

    wind->drop_fullscreen_requests = true;
    FlushPendingEvents(window);
    wind->drop_fullscreen_requests = false;

    // Nothing to do if the window is not fullscreen, and this isn't an explicit enter request.
    if (!wind->is_fullscreen) {
        if (fullscreen == SDL_FULLSCREEN_OP_UPDATE) {
            // Request was out of date; signal the video core not to update any state.
            return SDL_FULLSCREEN_PENDING;
        } else if (fullscreen == SDL_FULLSCREEN_OP_LEAVE) {
            // Already not fullscreen; nothing to do.
            return SDL_FULLSCREEN_SUCCEEDED;
        }
    }

    // Don't send redundant fullscreen set/unset events.
    if (!!fullscreen != wind->is_fullscreen) {
        wind->fullscreen_was_positioned = !!fullscreen;

        /* Only use the specified output if an exclusive mode is being used, or a position was explicitly requested
         * before entering fullscreen desktop. Otherwise, let the compositor handle placement, as it has more
         * information about where the window is and where it should go, particularly if fullscreen is being requested
         * before the window is mapped, or the window spans multiple outputs.
         */
        if (!window->fullscreen_exclusive) {
            if (window->undefined_x || window->undefined_y ||
                (wind->num_outputs && !window->last_position_pending)) {
                output = NULL;
            }
        }
        SetFullscreen(window, output, !!fullscreen);
    } else if (wind->is_fullscreen) {
        /*
         * If the window is already fullscreen, this is likely a request to switch between
         * fullscreen and fullscreen desktop, change outputs, or change the video mode.
         *
         * If the window is already positioned on the target output, just update the
         * window geometry.
         */
        if (wind->last_displayID != display->id) {
            wind->fullscreen_was_positioned = true;
            SetFullscreen(window, output, true);
        } else {
            ConfigureWindowGeometry(window);
            CommitLibdecorFrame(window);

            return SDL_FULLSCREEN_SUCCEEDED;
        }
    }

    return SDL_FULLSCREEN_PENDING;
}

void Wayland_RestoreWindow(SDL_VideoDevice *_this, SDL_Window *window)
{
    SDL_WindowData *wind = window->internal;

    // Drop restore requests when showing the window.
    if (wind->showing_window) {
        return;
    }

    // Not currently fullscreen or maximized, and no state pending; nothing to do.
    if (!(window->flags & (SDL_WINDOW_FULLSCREEN | SDL_WINDOW_MAXIMIZED)) &&
        !wind->fullscreen_deadline_count && !wind->maximized_restored_deadline_count) {
        return;
    }

#ifdef HAVE_LIBDECOR_H
    if (wind->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_LIBDECOR) {
        if (!wind->shell_surface.libdecor.frame) {
            return; // Can't do anything yet, wait for ShowWindow
        }
        libdecor_frame_unset_maximized(wind->shell_surface.libdecor.frame);

        ++wind->maximized_restored_deadline_count;
        struct wl_callback *cb = wl_display_sync(_this->internal->display);
        wl_callback_add_listener(cb, &maximized_restored_deadline_listener, (void *)((uintptr_t)window->id));
    } else
#endif
        // Note that xdg-shell does NOT provide a way to unset minimize!
        if (wind->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_XDG_TOPLEVEL) {
            if (wind->shell_surface.xdg.toplevel.xdg_toplevel == NULL) {
                return; // Can't do anything yet, wait for ShowWindow
            }
            xdg_toplevel_unset_maximized(wind->shell_surface.xdg.toplevel.xdg_toplevel);

            ++wind->maximized_restored_deadline_count;
            struct wl_callback *cb = wl_display_sync(_this->internal->display);
            wl_callback_add_listener(cb, &maximized_restored_deadline_listener, (void *)((uintptr_t)window->id));
        }
}

void Wayland_SetWindowBordered(SDL_VideoDevice *_this, SDL_Window *window, bool bordered)
{
    SDL_WindowData *wind = window->internal;
    const SDL_VideoData *viddata = (const SDL_VideoData *)_this->internal;

#ifdef HAVE_LIBDECOR_H
    if (wind->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_LIBDECOR) {
        if (wind->shell_surface.libdecor.frame) {
            libdecor_frame_set_visibility(wind->shell_surface.libdecor.frame, bordered);
        }
    } else
#endif
        if (wind->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_XDG_TOPLEVEL) {
        if ((viddata->decoration_manager) && (wind->server_decoration)) {
            const enum zxdg_toplevel_decoration_v1_mode mode = bordered ? ZXDG_TOPLEVEL_DECORATION_V1_MODE_SERVER_SIDE : ZXDG_TOPLEVEL_DECORATION_V1_MODE_CLIENT_SIDE;
            zxdg_toplevel_decoration_v1_set_mode(wind->server_decoration, mode);
        }
    }
}

void Wayland_SetWindowResizable(SDL_VideoDevice *_this, SDL_Window *window, bool resizable)
{
#ifdef HAVE_LIBDECOR_H
    const SDL_WindowData *wind = window->internal;

    if (wind->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_LIBDECOR) {
        if (!wind->shell_surface.libdecor.frame) {
            return; // Can't do anything yet, wait for ShowWindow
        }
        if (libdecor_frame_has_capability(wind->shell_surface.libdecor.frame, LIBDECOR_ACTION_RESIZE)) {
            if (!resizable) {
                libdecor_frame_unset_capabilities(wind->shell_surface.libdecor.frame, LIBDECOR_ACTION_RESIZE);
            }
        } else if (resizable) {
            libdecor_frame_set_capabilities(wind->shell_surface.libdecor.frame, LIBDECOR_ACTION_RESIZE);
        }
    }
#endif

    /* When changing the resize capability on libdecor windows, the limits must always
     * be reapplied, as when libdecor changes states, it overwrites the values internally.
     */
    SetMinMaxDimensions(window);
    CommitLibdecorFrame(window);
}

void Wayland_MaximizeWindow(SDL_VideoDevice *_this, SDL_Window *window)
{
    SDL_VideoData *viddata = _this->internal;
    SDL_WindowData *wind = window->internal;

    if (wind->show_hide_sync_required) {
        WAYLAND_wl_display_roundtrip(_this->internal->display);
    }

    // Not fullscreen, already maximized, and no state pending; nothing to do.
    if (!(window->flags & SDL_WINDOW_FULLSCREEN) && (window->flags & SDL_WINDOW_MAXIMIZED) &&
        !wind->fullscreen_deadline_count && !wind->maximized_restored_deadline_count) {
        return;
    }

#ifdef HAVE_LIBDECOR_H
    if (wind->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_LIBDECOR) {
        if (!wind->shell_surface.libdecor.frame) {
            return; // Can't do anything yet, wait for ShowWindow
        }

        // Commit to preserve any pending size data.
        wl_surface_commit(wind->surface);
        libdecor_frame_set_maximized(wind->shell_surface.libdecor.frame);

        ++wind->maximized_restored_deadline_count;
        struct wl_callback *cb = wl_display_sync(viddata->display);
        wl_callback_add_listener(cb, &maximized_restored_deadline_listener, (void *)((uintptr_t)window->id));
    } else
#endif
        if (wind->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_XDG_TOPLEVEL) {
        if (wind->shell_surface.xdg.toplevel.xdg_toplevel == NULL) {
            return; // Can't do anything yet, wait for ShowWindow
        }

        // Commit to preserve any pending size data.
        wl_surface_commit(wind->surface);
        xdg_toplevel_set_maximized(wind->shell_surface.xdg.toplevel.xdg_toplevel);

        ++wind->maximized_restored_deadline_count;
        struct wl_callback *cb = wl_display_sync(viddata->display);
        wl_callback_add_listener(cb, &maximized_restored_deadline_listener, (void *)((uintptr_t)window->id));
    }
}

void Wayland_MinimizeWindow(SDL_VideoDevice *_this, SDL_Window *window)
{
    SDL_WindowData *wind = window->internal;

    if (!(wind->wm_caps & WAYLAND_WM_CAPS_MINIMIZE)) {
        return;
    }

#ifdef HAVE_LIBDECOR_H
    if (wind->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_LIBDECOR) {
        if (!wind->shell_surface.libdecor.frame) {
            return; // Can't do anything yet, wait for ShowWindow
        }
        libdecor_frame_set_minimized(wind->shell_surface.libdecor.frame);
        SDL_SendWindowEvent(window, SDL_EVENT_WINDOW_MINIMIZED, 0, 0);
    } else
#endif
        if (wind->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_XDG_TOPLEVEL) {
        if (wind->shell_surface.xdg.toplevel.xdg_toplevel == NULL) {
            return; // Can't do anything yet, wait for ShowWindow
        }
        xdg_toplevel_set_minimized(wind->shell_surface.xdg.toplevel.xdg_toplevel);
        SDL_SendWindowEvent(window, SDL_EVENT_WINDOW_MINIMIZED, 0, 0);
    }
}

bool Wayland_SetWindowMouseRect(SDL_VideoDevice *_this, SDL_Window *window)
{
    SDL_VideoData *data = _this->internal;

    /* This may look suspiciously like SetWindowGrab, despite SetMouseRect not
     * implicitly doing a grab. And you're right! Wayland doesn't let us mess
     * around with mouse focus whatsoever, so it just happens to be that the
     * work that we can do in these two functions ends up being the same.
     *
     * Just know that this call lets you confine with a rect, SetWindowGrab
     * lets you confine without a rect.
     */
    if (!data->pointer_constraints) {
        return SDL_SetError("Failed to grab mouse: compositor lacks support for the required zwp_pointer_constraints_v1 protocol");
    }
    Wayland_DisplayUpdatePointerGrabs(data, window->internal);
    return true;
}

bool Wayland_SetWindowMouseGrab(SDL_VideoDevice *_this, SDL_Window *window, bool grabbed)
{
    SDL_VideoData *data = _this->internal;
    if (!data->pointer_constraints) {
        return SDL_SetError("Failed to grab mouse: compositor lacks support for the required zwp_pointer_constraints_v1 protocol");
    }
    Wayland_DisplayUpdatePointerGrabs(data, window->internal);
    return true;
}

bool Wayland_SetWindowKeyboardGrab(SDL_VideoDevice *_this, SDL_Window *window, bool grabbed)
{
    SDL_VideoData *data = _this->internal;
    if (!data->key_inhibitor_manager) {
        return SDL_SetError("Failed to grab keyboard: compositor lacks support for the required zwp_keyboard_shortcuts_inhibit_manager_v1 protocol");
    }
    Wayland_DisplayUpdateKeyboardGrabs(data, window->internal);
    return true;
}

bool Wayland_ReconfigureWindow(SDL_VideoDevice *_this, SDL_Window *window, SDL_WindowFlags flags)
{
    SDL_WindowData *data = window->internal;

    if (data->shell_surface_status == WAYLAND_SHELL_SURFACE_STATUS_SHOWN) {
        // Window is already mapped; abort.
        return false;
    }

    /* The caller guarantees that only one of the GL or Vulkan flags will be set,
     * and the window will have no previous video flags.
     */
    if (flags & SDL_WINDOW_OPENGL) {
        if (!data->egl_window) {
            data->egl_window = WAYLAND_wl_egl_window_create(data->surface, data->current.pixel_width, data->current.pixel_height);
        }

#ifdef SDL_VIDEO_OPENGL_EGL
        // Create the GLES window surface
        data->egl_surface = SDL_EGL_CreateSurface(_this, window, (NativeWindowType)data->egl_window);

        if (data->egl_surface == EGL_NO_SURFACE) {
            return false; // SDL_EGL_CreateSurface should have set error
        }
#endif

        if (!data->gles_swap_frame_event_queue) {
            data->gles_swap_frame_event_queue = WAYLAND_wl_display_create_queue(data->waylandData->display);
            data->gles_swap_frame_surface_wrapper = WAYLAND_wl_proxy_create_wrapper(data->surface);
            WAYLAND_wl_proxy_set_queue((struct wl_proxy *)data->gles_swap_frame_surface_wrapper, data->gles_swap_frame_event_queue);
            data->gles_swap_frame_callback = wl_surface_frame(data->gles_swap_frame_surface_wrapper);
            wl_callback_add_listener(data->gles_swap_frame_callback, &gles_swap_frame_listener, data);
        }

        return true;
    } else if (flags & SDL_WINDOW_VULKAN) {
        // Nothing to configure for Vulkan.
        return true;
    }

    return false;
}

bool Wayland_CreateWindow(SDL_VideoDevice *_this, SDL_Window *window, SDL_PropertiesID create_props)
{
    SDL_WindowData *data;
    SDL_VideoData *c = _this->internal;
    struct wl_surface *external_surface = (struct wl_surface *)SDL_GetPointerProperty(create_props, SDL_PROP_WINDOW_CREATE_WAYLAND_WL_SURFACE_POINTER,
                                                                               (struct wl_surface *)SDL_GetPointerProperty(create_props, "sdl2-compat.external_window", NULL));
    const bool custom_surface_role = (external_surface != NULL) || SDL_GetBooleanProperty(create_props, SDL_PROP_WINDOW_CREATE_WAYLAND_SURFACE_ROLE_CUSTOM_BOOLEAN, false);
    const bool create_egl_window = !!(window->flags & SDL_WINDOW_OPENGL) ||
                                       SDL_GetBooleanProperty(create_props, SDL_PROP_WINDOW_CREATE_WAYLAND_CREATE_EGL_WINDOW_BOOLEAN, false);

    data = SDL_calloc(1, sizeof(*data));
    if (!data) {
        return false;
    }

    window->internal = data;

    if (window->x == SDL_WINDOWPOS_UNDEFINED) {
        window->x = 0;
    }
    if (window->y == SDL_WINDOWPOS_UNDEFINED) {
        window->y = 0;
    }

    data->waylandData = c;
    data->sdlwindow = window;

    // Default to all capabilities
    data->wm_caps = WAYLAND_WM_CAPS_ALL;

    data->scale_factor = 1.0;

    if (SDL_WINDOW_IS_POPUP(window)) {
        data->scale_to_display = window->parent->internal->scale_to_display;
        data->scale_factor = window->parent->internal->scale_factor;
        EnsurePopupPositionIsValid(window, &window->x, &window->y);
    } else {
        for (int i = 0; i < _this->num_displays; i++) {
            data->scale_factor = SDL_max(data->scale_factor, _this->displays[i]->internal->scale_factor);
        }
    }

    data->outputs = NULL;
    data->num_outputs = 0;
    data->scale_to_display = c->scale_to_display_enabled;

    // Cache the app_id at creation time, as it may change before the window is mapped.
    data->app_id = SDL_strdup(SDL_GetAppID());

    if (!data->scale_to_display) {
        data->requested.logical_width = window->floating.w;
        data->requested.logical_height = window->floating.h;
    } else {
        data->requested.logical_width = PixelToPoint(window, window->floating.w);
        data->requested.logical_height = PixelToPoint(window, window->floating.h);
        data->requested.pixel_width = window->floating.w;
        data->requested.pixel_height = window->floating.h;
    }

    if (!external_surface) {
        data->surface = wl_compositor_create_surface(c->compositor);
        wl_surface_add_listener(data->surface, &surface_listener, data);
        wl_surface_set_user_data(data->surface, data);
        SDL_WAYLAND_register_surface(data->surface);
    } else {
        window->flags |= SDL_WINDOW_EXTERNAL;
        data->surface = external_surface;

        /* External surfaces are registered by being put in a list, as changing tags or userdata
         * can cause problems with external toolkits.
         */
        Wayland_AddWindowDataToExternalList(data);
    }

    /* Always attach a viewport and fractional scale manager if available and the surface is not custom/external,
     * or the custom/external surface was explicitly flagged as high pixel density aware, which signals that the
     * application wants SDL to handle scaling.
     */
    if (!custom_surface_role || (window->flags & SDL_WINDOW_HIGH_PIXEL_DENSITY)) {
        if (c->viewporter) {
            data->viewport = wp_viewporter_get_viewport(c->viewporter, data->surface);

            // The viewport always uses the entire buffer.
            wp_viewport_set_source(data->viewport,
                                   wl_fixed_from_int(-1), wl_fixed_from_int(-1),
                                   wl_fixed_from_int(-1), wl_fixed_from_int(-1));
        }
        if (c->fractional_scale_manager) {
            data->fractional_scale = wp_fractional_scale_manager_v1_get_fractional_scale(c->fractional_scale_manager, data->surface);
            wp_fractional_scale_v1_add_listener(data->fractional_scale, &fractional_scale_listener, data);
        }
    }

    if (!custom_surface_role) {
        if (c->wp_color_manager_v1) {
            data->wp_color_management_surface_feedback = wp_color_manager_v1_get_surface_feedback(c->wp_color_manager_v1, data->surface);
            wp_color_management_surface_feedback_v1_add_listener(data->wp_color_management_surface_feedback, &color_management_surface_feedback_listener, data);
            Wayland_GetColorInfoForWindow(data, true);
        } else if (c->frog_color_management_factory_v1) {
            data->frog_color_managed_surface = frog_color_management_factory_v1_get_color_managed_surface(c->frog_color_management_factory_v1, data->surface);
            frog_color_managed_surface_add_listener(data->frog_color_managed_surface, &frog_surface_listener, data);
        }

        if (c->wp_alpha_modifier_v1) {
            data->wp_alpha_modifier_surface_v1 = wp_alpha_modifier_v1_get_surface(c->wp_alpha_modifier_v1, data->surface);
            wp_alpha_modifier_surface_v1_set_multiplier(data->wp_alpha_modifier_surface_v1, SDL_MAX_UINT32);
        }
    }

    // Must be called before EGL configuration to set the drawable backbuffer size.
    ConfigureWindowGeometry(window);

    /* Fire a callback when the compositor wants a new frame rendered.
     * Right now this only matters for OpenGL; we use this callback to add a
     * wait timeout that avoids getting deadlocked by the compositor when the
     * window isn't visible.
     */
    if (window->flags & SDL_WINDOW_OPENGL) {
        data->gles_swap_frame_event_queue = WAYLAND_wl_display_create_queue(data->waylandData->display);
        data->gles_swap_frame_surface_wrapper = WAYLAND_wl_proxy_create_wrapper(data->surface);
        WAYLAND_wl_proxy_set_queue((struct wl_proxy *)data->gles_swap_frame_surface_wrapper, data->gles_swap_frame_event_queue);
        data->gles_swap_frame_callback = wl_surface_frame(data->gles_swap_frame_surface_wrapper);
        wl_callback_add_listener(data->gles_swap_frame_callback, &gles_swap_frame_listener, data);
    }

    // No frame callback on external surfaces as it may already have one attached.
    if (!external_surface) {
        // Fire a callback when the compositor wants a new frame to set the surface damage region.
        data->surface_frame_callback = wl_surface_frame(data->surface);
        wl_callback_add_listener(data->surface_frame_callback, &surface_frame_listener, data);
    }

    if (window->flags & SDL_WINDOW_TRANSPARENT) {
        if (_this->gl_config.alpha_size == 0) {
            _this->gl_config.alpha_size = 8;
        }
    }

    if (create_egl_window) {
        data->egl_window = WAYLAND_wl_egl_window_create(data->surface, data->current.pixel_width, data->current.pixel_height);
    }

#ifdef SDL_VIDEO_OPENGL_EGL
    if (window->flags & SDL_WINDOW_OPENGL) {
        // Create the GLES window surface
        data->egl_surface = SDL_EGL_CreateSurface(_this, window, (NativeWindowType)data->egl_window);

        if (data->egl_surface == EGL_NO_SURFACE) {
            return false; // SDL_EGL_CreateSurface should have set error
        }
    }
#endif

    // We may need to create an idle inhibitor for this new window
    Wayland_SuspendScreenSaver(_this);

    if (!custom_surface_role) {
#ifdef HAVE_LIBDECOR_H
        if (c->shell.libdecor && !SDL_WINDOW_IS_POPUP(window)) {
            data->shell_surface_type = WAYLAND_SHELL_SURFACE_TYPE_LIBDECOR;
        } else
#endif
            if (c->shell.xdg) {
            if (SDL_WINDOW_IS_POPUP(window)) {
                data->shell_surface_type = WAYLAND_SHELL_SURFACE_TYPE_XDG_POPUP;
            } else {
                data->shell_surface_type = WAYLAND_SHELL_SURFACE_TYPE_XDG_TOPLEVEL;
            }
        } // All other cases will be WAYLAND_SURFACE_UNKNOWN
    } else {
        // Roleless and external surfaces are always considered to be in the shown state by the backend.
        data->shell_surface_type = WAYLAND_SHELL_SURFACE_TYPE_CUSTOM;
        data->shell_surface_status = WAYLAND_SHELL_SURFACE_STATUS_SHOWN;
    }

    if (SDL_GetHintBoolean(SDL_HINT_VIDEO_DOUBLE_BUFFER, false)) {
        data->double_buffer = true;
    }

    SDL_PropertiesID props = SDL_GetWindowProperties(window);
    SDL_SetPointerProperty(props, SDL_PROP_WINDOW_WAYLAND_DISPLAY_POINTER, data->waylandData->display);
    SDL_SetPointerProperty(props, SDL_PROP_WINDOW_WAYLAND_SURFACE_POINTER, data->surface);
    SDL_SetPointerProperty(props, SDL_PROP_WINDOW_WAYLAND_VIEWPORT_POINTER, data->viewport);
    SDL_SetPointerProperty(props, SDL_PROP_WINDOW_WAYLAND_EGL_WINDOW_POINTER, data->egl_window);

    data->hit_test_result = SDL_HITTEST_NORMAL;

    return true;
}

void Wayland_SetWindowMinimumSize(SDL_VideoDevice *_this, SDL_Window *window)
{
    // Will be committed when Wayland_SetWindowSize() is called by the video core.
    SetMinMaxDimensions(window);
}

void Wayland_SetWindowMaximumSize(SDL_VideoDevice *_this, SDL_Window *window)
{
    // Will be committed when Wayland_SetWindowSize() is called by the video core.
    SetMinMaxDimensions(window);
}

bool Wayland_SetWindowPosition(SDL_VideoDevice *_this, SDL_Window *window)
{
    SDL_WindowData *wind = window->internal;

    // Only popup windows can be positioned relative to the parent.
    if (wind->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_XDG_POPUP) {
        if (wind->shell_surface.xdg.popup.xdg_popup &&
            xdg_popup_get_version(wind->shell_surface.xdg.popup.xdg_popup) < XDG_POPUP_REPOSITION_SINCE_VERSION) {
            return SDL_Unsupported();
        }

        RepositionPopup(window, false);
        return true;
    } else if (wind->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_LIBDECOR || wind->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_XDG_TOPLEVEL) {
        /* Catch up on any pending state before attempting to change the fullscreen window
         * display via a set fullscreen call to make sure the window doesn't have a pending
         * leave fullscreen event that it might override.
         */
        FlushPendingEvents(window);

        if (wind->is_fullscreen) {
            SDL_VideoDisplay *display = SDL_GetVideoDisplayForFullscreenWindow(window);
            if (display && wind->last_displayID != display->id) {
                struct wl_output *output = display->internal->output;
                SetFullscreen(window, output, true);

                return true;
            }
        }
    }
    return SDL_SetError("wayland cannot position non-popup windows");
}

void Wayland_SetWindowSize(SDL_VideoDevice *_this, SDL_Window *window)
{
    SDL_WindowData *wind = window->internal;

    /* Flush any pending state operations, as fullscreen windows do not get
     * explicitly resized, not strictly obeying the size of a maximized window
     * is a protocol violation, and pending restore events might result in a
     * configure event overwriting the requested size.
     *
     * Calling this on a custom surface is informative, so the size must
     * always be passed through.
     */
    FlushPendingEvents(window);

    // Maximized and fullscreen windows don't get resized.
    if (!(window->flags & (SDL_WINDOW_FULLSCREEN | SDL_WINDOW_MAXIMIZED)) ||
        wind->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_CUSTOM) {
        if (!wind->scale_to_display) {
            wind->requested.logical_width = window->pending.w;
            wind->requested.logical_height = window->pending.h;
        } else {
            wind->requested.logical_width = PixelToPoint(window, window->pending.w);
            wind->requested.logical_height = PixelToPoint(window, window->pending.h);
            wind->requested.pixel_width = window->pending.w;
            wind->requested.pixel_height = window->pending.h;
        }

        ConfigureWindowGeometry(window);
    } else {
        // Can't resize the window.
        window->last_size_pending = false;
    }

    // Always commit, as this may be in response to a min/max limit change.
    CommitLibdecorFrame(window);
}

void Wayland_GetWindowSizeInPixels(SDL_VideoDevice *_this, SDL_Window *window, int *w, int *h)
{
    SDL_WindowData *data = window->internal;

    *w = data->current.pixel_width;
    *h = data->current.pixel_height;
}

float Wayland_GetWindowContentScale(SDL_VideoDevice *_this, SDL_Window *window)
{
    SDL_WindowData *wind = window->internal;

    if (window->flags & SDL_WINDOW_HIGH_PIXEL_DENSITY || wind->scale_to_display || wind->fullscreen_exclusive) {
        return (float)wind->scale_factor;
    }

    return 1.0f;
}

SDL_DisplayID Wayland_GetDisplayForWindow(SDL_VideoDevice *_this, SDL_Window *window)
{
    SDL_WindowData *wind = window->internal;

    if (wind) {
        return wind->last_displayID;
    }

    return 0;
}

bool Wayland_SetWindowOpacity(SDL_VideoDevice *_this, SDL_Window *window, float opacity)
{
    SDL_WindowData *wind = window->internal;

    if (wind->wp_alpha_modifier_surface_v1) {
        SetSurfaceOpaqueRegion(wind, !(window->flags & SDL_WINDOW_TRANSPARENT) && opacity == 1.0f);
        wp_alpha_modifier_surface_v1_set_multiplier(wind->wp_alpha_modifier_surface_v1, (Uint32)((double)SDL_MAX_UINT32 * (double)opacity));

        return true;
    }

    return SDL_SetError("wayland: set window opacity failed; compositor lacks support for the required wp_alpha_modifier_v1 protocol");
}

void Wayland_SetWindowTitle(SDL_VideoDevice *_this, SDL_Window *window)
{
    SDL_WindowData *wind = window->internal;
    const char *title = window->title ? window->title : "";

#ifdef HAVE_LIBDECOR_H
    if (wind->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_LIBDECOR && wind->shell_surface.libdecor.frame) {
        libdecor_frame_set_title(wind->shell_surface.libdecor.frame, title);
    } else
#endif
        if (wind->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_XDG_TOPLEVEL && wind->shell_surface.xdg.toplevel.xdg_toplevel) {
        xdg_toplevel_set_title(wind->shell_surface.xdg.toplevel.xdg_toplevel, title);
    }
}

static int icon_sort_callback(const void *a, const void *b)
{
    SDL_Surface *s1 = (SDL_Surface *)a;
    SDL_Surface *s2 = (SDL_Surface *)b;

    return (s1->w * s1->h) <= (s2->w * s2->h) ? -1 : 1;
}

bool Wayland_SetWindowIcon(SDL_VideoDevice *_this, SDL_Window *window, SDL_Surface *icon)
{
    SDL_WindowData *wind = window->internal;
    Wayland_SHMPool *shm_pool = NULL;
    struct xdg_toplevel *toplevel = NULL;

    if (!_this->internal->xdg_toplevel_icon_manager_v1) {
        return SDL_SetError("wayland: cannot set icon; required xdg_toplevel_icon_v1 protocol not supported");
    }

    if (icon->w != icon->h) {
        return SDL_SetError("wayland: icon width and height must be equal, got %ix%i", icon->w, icon->h);
    }

    int image_count = 0;
    SDL_Surface **images = SDL_GetSurfaceImages(icon, &image_count);
    if (!images || !image_count) {
        return false;
    }

    // Release the old icon resources.
    if (wind->xdg_toplevel_icon_v1) {
        xdg_toplevel_icon_v1_destroy(wind->xdg_toplevel_icon_v1);
        wind->xdg_toplevel_icon_v1 = NULL;
    }

    for (int i = 0; i < wind->icon_buffer_count; ++i) {
        wl_buffer_destroy(wind->icon_buffers[i]);
    }
    wind->icon_buffer_count = 0;

    wind->xdg_toplevel_icon_v1 = xdg_toplevel_icon_manager_v1_create_icon(_this->internal->xdg_toplevel_icon_manager_v1);
    wind->icon_buffers = SDL_realloc(wind->icon_buffers, image_count * sizeof(struct wl_buffer *));
    if (!wind->icon_buffers) {
        goto failure_cleanup;
    }

    // Calculate the size of the buffer pool.
    size_t pool_size = 0;
    for (int i = 0; i < image_count; ++i) {
        // Ignore non-square images; if we got here, we know that at least the base image is square.
        if (images[i]->w == images[i]->h) {
            pool_size += images[i]->w * images[i]->h * 4;
        } else {
            SDL_LogWarn(SDL_LOG_CATEGORY_VIDEO, "wayland: icon width and height must be equal, got %ix%i for image level %i; skipping", images[i]->w, images[i]->h, i);
        }
    }

    // Sort the images in ascending order by size.
    SDL_qsort(images, image_count, sizeof(SDL_Surface *), icon_sort_callback);

    shm_pool = Wayland_AllocSHMPool(pool_size);
    if (!shm_pool) {
        SDL_SetError("wayland: failed to allocate SHM pool for the icon");
        goto failure_cleanup;
    }

    for (int i = 0; i < image_count; ++i) {
        if (images[i]->w == images[i]->h) {
            SDL_Surface *surface = images[i];

            // Choose the largest image for each integer scale, ignoring any below the base size.
            const int scale = (int)SDL_floor((double)surface->w / (double)icon->w);
            if (!scale) {
                continue;
            }

            void *buffer_mem;
            struct wl_buffer *buffer = Wayland_AllocBufferFromPool(shm_pool, surface->w, surface->h, &buffer_mem);
            if (!buffer) {
                SDL_SetError("wayland: failed to allocate SHM buffer for the icon");
                goto failure_cleanup;
            }

            wind->icon_buffers[wind->icon_buffer_count++] = buffer;

            if (surface->format != SDL_PIXELFORMAT_ARGB8888) {
                surface = SDL_ConvertSurface(surface, SDL_PIXELFORMAT_ARGB8888);
                if (!surface) {
                    SDL_SetError("wayland: unable to convert surface to ARGB8888 format");
                    goto failure_cleanup;
                }
            }

            SDL_PremultiplyAlpha(surface->w, surface->h, surface->format, surface->pixels, surface->pitch,
                                 SDL_PIXELFORMAT_ARGB8888, buffer_mem, surface->w * 4, true);

            xdg_toplevel_icon_v1_add_buffer(wind->xdg_toplevel_icon_v1, buffer, scale);

            // Clean up the temporary conversion surface.
            if (surface != images[i]) {
                SDL_DestroySurface(surface);
            }
        }
    }

#ifdef HAVE_LIBDECOR_H
    if (wind->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_LIBDECOR && wind->shell_surface.libdecor.frame) {
        toplevel = libdecor_frame_get_xdg_toplevel(wind->shell_surface.libdecor.frame);
    } else
#endif
        if (wind->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_XDG_TOPLEVEL && wind->shell_surface.xdg.toplevel.xdg_toplevel) {
        toplevel = wind->shell_surface.xdg.toplevel.xdg_toplevel;
    }

    if (toplevel) {
        xdg_toplevel_icon_manager_v1_set_icon(_this->internal->xdg_toplevel_icon_manager_v1, toplevel, wind->xdg_toplevel_icon_v1);
    }

    Wayland_ReleaseSHMPool(shm_pool);
    SDL_free(images);

    return true;

failure_cleanup:

    SDL_free(images);

    if (wind->xdg_toplevel_icon_v1) {
        xdg_toplevel_icon_v1_destroy(wind->xdg_toplevel_icon_v1);
        wind->xdg_toplevel_icon_v1 = NULL;
    }

    Wayland_ReleaseSHMPool(shm_pool);

    for (int i = 0; i < wind->icon_buffer_count; ++i) {
        wl_buffer_destroy(wind->icon_buffers[i]);
    }
    SDL_free(wind->icon_buffers);
    wind->icon_buffers = NULL;
    wind->icon_buffer_count = 0;

    return false;
}

void *Wayland_GetWindowICCProfile(SDL_VideoDevice *_this, SDL_Window *window, size_t *size)
{
    SDL_WindowData *wind = window->internal;
    void *ret = NULL;

    if (wind->icc_size > 0) {
        void *icc_map = mmap(NULL, wind->icc_size, PROT_READ, MAP_PRIVATE, wind->icc_fd, 0);
        if (icc_map != MAP_FAILED) {
            ret = SDL_malloc(wind->icc_size);
            if (ret) {
                *size = wind->icc_size;
                SDL_memcpy(ret, icc_map, *size);
            }
            munmap(icc_map, wind->icc_size);
        }
    }

    return ret;
}

bool Wayland_SyncWindow(SDL_VideoDevice *_this, SDL_Window *window)
{
    SDL_WindowData *wind = window->internal;

    do {
        WAYLAND_wl_display_roundtrip(_this->internal->display);
    } while (wind->fullscreen_deadline_count || wind->maximized_restored_deadline_count);

    return true;
}

bool Wayland_SetWindowFocusable(SDL_VideoDevice *_this, SDL_Window *window, bool focusable)
{
    if (window->flags & SDL_WINDOW_POPUP_MENU) {
        if (!(window->flags & SDL_WINDOW_HIDDEN)) {
            if (!focusable && (window->flags & SDL_WINDOW_INPUT_FOCUS)) {
                SDL_Window *new_focus;
                const bool set_focus = SDL_ShouldRelinquishPopupFocus(window, &new_focus);
                Wayland_SetKeyboardFocus(new_focus, set_focus);
            } else if (focusable) {
                if (SDL_ShouldFocusPopup(window)) {
                    Wayland_SetKeyboardFocus(window, true);
                }
            }
        }

        return true;
    }

    return SDL_SetError("wayland: focus can only be toggled on popup menu windows");
}

void Wayland_ShowWindowSystemMenu(SDL_Window *window, int x, int y)
{
    SDL_WindowData *wind = window->internal;
    SDL_WaylandSeat *seat = wind->waylandData->last_implicit_grab_seat;

    if (!seat) {
        return;
    }

    if (wind->scale_to_display) {
        x = PixelToPoint(window, x);
        y = PixelToPoint(window, y);
    }

#ifdef HAVE_LIBDECOR_H
    if (wind->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_LIBDECOR) {
        if (wind->shell_surface.libdecor.frame) {
            libdecor_frame_show_window_menu(wind->shell_surface.libdecor.frame, seat->wl_seat, seat->last_implicit_grab_serial, x, y);
        }
    } else
#endif
    if (wind->shell_surface_type == WAYLAND_SHELL_SURFACE_TYPE_XDG_TOPLEVEL) {
        if (wind->shell_surface.xdg.toplevel.xdg_toplevel) {
            xdg_toplevel_show_window_menu(wind->shell_surface.xdg.toplevel.xdg_toplevel, seat->wl_seat, seat->last_implicit_grab_serial, x, y);
        }
    }
}

bool Wayland_SuspendScreenSaver(SDL_VideoDevice *_this)
{
    SDL_VideoData *data = _this->internal;

#ifdef SDL_USE_LIBDBUS
    if (SDL_DBus_ScreensaverInhibit(_this->suspend_screensaver)) {
        return true;
    }
#endif

    /* The idle_inhibit_unstable_v1 protocol suspends the screensaver
       on a per wl_surface basis, but SDL assumes that suspending
       the screensaver can be done independently of any window.

       To reconcile these differences, we propagate the idle inhibit
       state to each window. If there is no window active, we will
       be able to inhibit idle once the first window is created.
    */
    if (data->idle_inhibit_manager) {
        SDL_Window *window = _this->windows;
        while (window) {
            SDL_WindowData *win_data = window->internal;

            if (_this->suspend_screensaver && !win_data->idle_inhibitor) {
                win_data->idle_inhibitor =
                    zwp_idle_inhibit_manager_v1_create_inhibitor(data->idle_inhibit_manager,
                                                                 win_data->surface);
            } else if (!_this->suspend_screensaver && win_data->idle_inhibitor) {
                zwp_idle_inhibitor_v1_destroy(win_data->idle_inhibitor);
                win_data->idle_inhibitor = NULL;
            }

            window = window->next;
        }
    }

    return true;
}

void Wayland_DestroyWindow(SDL_VideoDevice *_this, SDL_Window *window)
{
    SDL_VideoData *data = _this->internal;
    SDL_WindowData *wind = window->internal;

    if (data && wind) {
        /* Roundtrip before destroying the window to make sure that it has received input leave events, so that
         * no internal structures are left pointing to the destroyed window.
         */
        if (wind->show_hide_sync_required) {
            WAYLAND_wl_display_roundtrip(data->display);
        }

        /* The compositor should have relinquished keyboard, pointer, touch, and tablet tool focus when the toplevel
         * window was destroyed upon being hidden, but there is no guarantee of this, so ensure that all references
         * to the window held by seats are released before destroying the underlying surface and struct.
         */
        Wayland_DisplayRemoveWindowReferencesFromSeats(data, wind);

#ifdef SDL_VIDEO_OPENGL_EGL
        if (wind->egl_surface) {
            SDL_EGL_DestroySurface(_this, wind->egl_surface);
        }
#endif
        if (wind->egl_window) {
            WAYLAND_wl_egl_window_destroy(wind->egl_window);
        }

        if (wind->idle_inhibitor) {
            zwp_idle_inhibitor_v1_destroy(wind->idle_inhibitor);
        }

        if (wind->activation_token) {
            xdg_activation_token_v1_destroy(wind->activation_token);
        }

        if (wind->viewport) {
            wp_viewport_destroy(wind->viewport);
        }

        if (wind->fractional_scale) {
            wp_fractional_scale_v1_destroy(wind->fractional_scale);
        }

        if (wind->wp_alpha_modifier_surface_v1) {
            wp_alpha_modifier_surface_v1_destroy(wind->wp_alpha_modifier_surface_v1);
        }

        if (wind->frog_color_managed_surface) {
            frog_color_managed_surface_destroy(wind->frog_color_managed_surface);
        }

        if (wind->wp_color_management_surface_feedback) {
            Wayland_FreeColorInfoState(wind->color_info_state);
            wp_color_management_surface_feedback_v1_destroy(wind->wp_color_management_surface_feedback);
        }

        SDL_free(wind->outputs);
        SDL_free(wind->app_id);

        if (wind->gles_swap_frame_callback) {
            wl_callback_destroy(wind->gles_swap_frame_callback);
            WAYLAND_wl_proxy_wrapper_destroy(wind->gles_swap_frame_surface_wrapper);
            WAYLAND_wl_event_queue_destroy(wind->gles_swap_frame_event_queue);
        }

        if (wind->surface_frame_callback) {
            wl_callback_destroy(wind->surface_frame_callback);
        }

        if (!(window->flags & SDL_WINDOW_EXTERNAL)) {
            wl_surface_destroy(wind->surface);
        } else {
            Wayland_RemoveWindowDataFromExternalList(wind);
        }

        if (wind->xdg_toplevel_icon_v1) {
            xdg_toplevel_icon_v1_destroy(wind->xdg_toplevel_icon_v1);
        }

        for (int i = 0; i < wind->icon_buffer_count; ++i) {
            wl_buffer_destroy(wind->icon_buffers[i]);
        }
        SDL_free(wind->icon_buffers);
        wind->icon_buffer_count = 0;

        SDL_free(wind);
    }
    window->internal = NULL;
}

#endif // SDL_VIDEO_DRIVER_WAYLAND
