source: mainline/uspace/srv/hid/display/window.c@ 7470d97

/*
 * Copyright (c) 2019 Jiri Svoboda
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup display
 * @{
 */
/**
 * @file Display server window
 */

#include <gfx/bitmap.h>
#include <gfx/color.h>
#include <gfx/coord.h>
#include <gfx/context.h>
#include <gfx/render.h>
#include <io/log.h>
#include <io/pixelmap.h>
#include <macros.h>
#include <memgfx/memgc.h>
#include <stdlib.h>
#include "client.h"
#include "display.h"
#include "seat.h"
#include "window.h"

static void ds_window_invalidate_cb(void *, gfx_rect_t *);
static void ds_window_update_cb(void *);
static void ds_window_get_preview_rect(ds_window_t *, gfx_rect_t *);

/** Create window.
 *
 * Create graphics context for rendering into a window.
 *
 * @param client Client owning the window
 * @param params Window parameters
 * @param rgc Place to store pointer to new GC.
 *
 * @return EOK on success or an error code
 */
errno_t ds_window_create(ds_client_t *client, display_wnd_params_t *params,
    ds_window_t **rgc)
{
        ds_window_t *wnd = NULL;
        gfx_context_t *dgc;
        gfx_coord2_t dims;
        gfx_bitmap_params_t bparams;
        gfx_bitmap_alloc_t alloc;
        errno_t rc;

        wnd = calloc(1, sizeof(ds_window_t));
        if (wnd == NULL) {
                rc = ENOMEM;
                goto error;
        }

        ds_client_add_window(client, wnd);
        ds_display_add_window(client->display, wnd);

        gfx_bitmap_params_init(&bparams);
        bparams.rect = params->rect;

        dgc = ds_display_get_gc(wnd->display);
        if (dgc != NULL) {
                rc = gfx_bitmap_create(dgc, &bparams, NULL, &wnd->bitmap);
                if (rc != EOK)
                        goto error;

                rc = gfx_bitmap_get_alloc(wnd->bitmap, &alloc);
                if (rc != EOK)
                        goto error;

                gfx_rect_dims(&params->rect, &dims);
                wnd->pixelmap.width = dims.x;
                wnd->pixelmap.height = dims.y;
                wnd->pixelmap.data = alloc.pixels;
        } else {
                /* This is just for unit tests */
                gfx_rect_dims(&params->rect, &dims);
                alloc.pitch = dims.x * sizeof(uint32_t);
                alloc.off0 = 0;
                alloc.pixels = calloc(1, alloc.pitch * dims.y);
        }

        rc = mem_gc_create(&params->rect, &alloc, ds_window_invalidate_cb,
            ds_window_update_cb, (void *)wnd, &wnd->mgc);
        if (rc != EOK)
                goto error;

        wnd->rect = params->rect;
        wnd->min_size = params->min_size;
        wnd->gc = mem_gc_get_ctx(wnd->mgc);
        wnd->cursor = wnd->display->cursor[dcurs_arrow];
        *rgc = wnd;
        return EOK;
error:
        if (wnd != NULL) {
                if (wnd->bitmap != NULL)
                        gfx_bitmap_destroy(wnd->bitmap);
                free(wnd);
        }

        return rc;
}

/** Destroy window.
 *
 * @param wnd Window
 */
void ds_window_destroy(ds_window_t *wnd)
{
        ds_display_t *disp;

        disp = wnd->display;

        ds_client_remove_window(wnd);
        ds_display_remove_window(wnd);

        mem_gc_delete(wnd->mgc);

        if (wnd->bitmap != NULL)
                gfx_bitmap_destroy(wnd->bitmap);

        free(wnd);

        (void) ds_display_paint(disp, NULL);
}

/** Bring window to top.
 *
 * @param wnd Window
 */
void ds_window_bring_to_top(ds_window_t *wnd)
{
        ds_display_t *disp = wnd->display;

        ds_display_remove_window(wnd);
        ds_display_add_window(disp, wnd);
        (void) ds_display_paint(wnd->display, NULL);
}

/** Get generic graphic context from window.
 *
 * @param wnd Window
 * @return Graphic context
 */
gfx_context_t *ds_window_get_ctx(ds_window_t *wnd)
{
        return wnd->gc;
}

/** Paint a window using its backing bitmap.
 *
 * @param wnd Window to paint
 * @param rect Display rectangle to paint to
 * @return EOK on success or an error code
 */
errno_t ds_window_paint(ds_window_t *wnd, gfx_rect_t *rect)
{
        gfx_rect_t srect;
        gfx_rect_t *brect;
        gfx_rect_t crect;

        log_msg(LOG_DEFAULT, LVL_DEBUG, "ds_window_paint");

        if (rect != NULL) {
                gfx_rect_rtranslate(&wnd->dpos, rect, &srect);

                /* Determine if we have anything to do */
                gfx_rect_clip(&srect, &wnd->rect, &crect);
                if (gfx_rect_is_empty(&crect))
                        return EOK;

                brect = &srect;
        } else {
                brect = NULL;
        }

        /* This can happen in unit tests */
        if (wnd->bitmap == NULL)
                return EOK;

        return gfx_bitmap_render(wnd->bitmap, brect, &wnd->dpos);
}

/** Get the preview rectangle for a window.
 *
 * Get the preview rectangle if the window is being resized or moved.
 * If the window is not being resized or moved, return an empty rectangle.
 *
 * @param wnd Window
 * @param rect Place to store preview rectangle
 */
static void ds_window_get_preview_rect(ds_window_t *wnd, gfx_rect_t *rect)
{
        switch (wnd->state) {
        case dsw_idle:
                break;
        case dsw_moving:
                gfx_rect_translate(&wnd->preview_pos, &wnd->rect, rect);
                return;
        case dsw_resizing:
                gfx_rect_translate(&wnd->dpos, &wnd->preview_rect, rect);
                return;
        }

        rect->p0.x = 0;
        rect->p0.y = 0;
        rect->p1.x = 0;
        rect->p1.y = 0;
}

/** Paint window preview if the window is being moved or resized.
 *
 * If the window is not being resized or moved, take no action and return
 * success.
 *
 * @param wnd Window for which to paint preview
 * @param rect Clipping rectangle
 * @return EOK on success or an error code
 */
errno_t ds_window_paint_preview(ds_window_t *wnd, gfx_rect_t *rect)
{
        errno_t rc;
        gfx_color_t *color;
        gfx_rect_t prect;
        gfx_rect_t dr;
        gfx_rect_t pr;
        gfx_context_t *gc;

        /*
         * Get preview rectangle. If the window is not being resized/moved,
         * we should get an empty rectangle.
         */
        ds_window_get_preview_rect(wnd, &prect);
        if (gfx_rect_is_empty(&prect)) {
                /* There is nothing to paint */
                return EOK;
        }

        rc = gfx_color_new_rgb_i16(0xffff, 0xffff, 0xffff, &color);
        if (rc != EOK)
                return rc;

        gc = ds_display_get_gc(wnd->display);
        if (gc != NULL) {
                gfx_set_color(gc, color);

                /*
                 * TODO: Ideally we'd want XOR operation to make the preview
                 * frame visible on any background. If we wanted to get really
                 * fancy, we'd fill it with a pattern
                 */

                pr.p0.x = prect.p0.x;
                pr.p0.y = prect.p0.y;
                pr.p1.x = prect.p1.x;
                pr.p1.y = prect.p0.y + 1;
                gfx_rect_clip(&pr, rect, &dr);
                gfx_fill_rect(gc, &dr);

                pr.p0.x = prect.p0.x;
                pr.p0.y = prect.p1.y - 1;
                pr.p1.x = prect.p1.x;
                pr.p1.y = prect.p1.y;
                gfx_rect_clip(&pr, rect, &dr);
                gfx_fill_rect(gc, &dr);

                pr.p0.x = prect.p0.x;
                pr.p0.y = prect.p0.y;
                pr.p1.x = prect.p0.x + 1;
                pr.p1.y = prect.p1.y;
                gfx_rect_clip(&pr, rect, &dr);
                gfx_fill_rect(gc, &dr);

                pr.p0.x = prect.p1.x - 1;
                pr.p0.y = prect.p0.y;
                pr.p1.x = prect.p1.x;
                pr.p1.y = prect.p1.y;
                gfx_rect_clip(&pr, rect, &dr);
                gfx_fill_rect(gc, &dr);

        }

        gfx_color_delete(color);
        return EOK;
}

/** Repaint window preview when resizing or moving.
 *
 * Repaint the window preview wich was previously at rectangle @a old_rect.
 * The current preview rectangle is determined from window state. If
 * the window did not previously have a preview, @a old_rect should point
 * to an empty rectangle or be NULL. When window has finished
 * moving or resizing, the preview will be cleared.
 *
 * @param wnd Window for which to paint preview
 * @param rect Clipping rectangle
 * @return EOK on success or an error code
 */
static errno_t ds_window_repaint_preview(ds_window_t *wnd, gfx_rect_t *old_rect)
{
        errno_t rc;
        gfx_rect_t prect;
        gfx_rect_t envelope;
        bool oldr;
        bool newr;

        log_msg(LOG_DEFAULT, LVL_DEBUG, "ds_window_repaint_preview");

        /*
         * Get current preview rectangle. If the window is not being resized/moved,
         * we should get an empty rectangle.
         */
        ds_window_get_preview_rect(wnd, &prect);

        oldr = (old_rect != NULL) && !gfx_rect_is_empty(old_rect);
        newr = !gfx_rect_is_empty(&prect);

        if (oldr && newr && gfx_rect_is_incident(old_rect, &prect)) {
                /*
                 * As an optimization, repaint both rectangles in a single
                 * operation.
                 */

                gfx_rect_envelope(old_rect, &prect, &envelope);

                rc = ds_display_paint(wnd->display, &envelope);
                if (rc != EOK)
                        return rc;
        } else {
                /* Repaint each rectangle separately */
                if (oldr) {
                        rc = ds_display_paint(wnd->display, old_rect);
                        if (rc != EOK)
                                return rc;
                }

                if (newr) {
                        rc = ds_display_paint(wnd->display, &prect);
                        if (rc != EOK)
                                return rc;
                }
        }

        return EOK;
}

/** Start moving a window by mouse drag.
 *
 * @param wnd Window
 * @param pos Position where mouse button was pressed
 */
static void ds_window_start_move(ds_window_t *wnd, gfx_coord2_t *pos)
{
        log_msg(LOG_DEFAULT, LVL_DEBUG, "ds_window_start_move (%d, %d)",
            (int) pos->x, (int) pos->y);

        if (wnd->state != dsw_idle)
                return;

        wnd->orig_pos = *pos;
        wnd->state = dsw_moving;
        wnd->preview_pos = wnd->dpos;

        (void) ds_window_repaint_preview(wnd, NULL);
}

/** Finish moving a window by mouse drag.
 *
 * @param wnd Window
 * @param pos Position where mouse button was released
 */
static void ds_window_finish_move(ds_window_t *wnd, gfx_coord2_t *pos)
{
        gfx_coord2_t dmove;
        gfx_coord2_t nwpos;
        gfx_rect_t old_rect;

        log_msg(LOG_DEFAULT, LVL_DEBUG, "ds_window_finish_move (%d, %d)",
            (int) pos->x, (int) pos->y);

        assert(wnd->state == dsw_moving);

        gfx_coord2_subtract(pos, &wnd->orig_pos, &dmove);
        gfx_coord2_add(&wnd->dpos, &dmove, &nwpos);

        ds_window_get_preview_rect(wnd, &old_rect);

        wnd->dpos = nwpos;
        wnd->state = dsw_idle;

        (void) ds_display_paint(wnd->display, NULL);
}

/** Update window position when moving by mouse drag.
 *
 * @param wnd Window
 * @param pos Current mouse position
 */
static void ds_window_update_move(ds_window_t *wnd, gfx_coord2_t *pos)
{
        gfx_coord2_t dmove;
        gfx_coord2_t nwpos;
        gfx_rect_t old_rect;

        log_msg(LOG_DEFAULT, LVL_DEBUG, "ds_window_update_move (%d, %d)",
            (int) pos->x, (int) pos->y);

        assert(wnd->state == dsw_moving);

        gfx_coord2_subtract(pos, &wnd->orig_pos, &dmove);
        gfx_coord2_add(&wnd->dpos, &dmove, &nwpos);

        ds_window_get_preview_rect(wnd, &old_rect);
        wnd->preview_pos = nwpos;

        (void) ds_window_repaint_preview(wnd, &old_rect);
}

/** Start resizing a window by mouse drag.
 *
 * @param wnd Window
 * @param rsztype Resize type (which part of window is being dragged)
 * @param pos Position where mouse button was pressed
 */
static void ds_window_start_resize(ds_window_t *wnd,
    display_wnd_rsztype_t rsztype, gfx_coord2_t *pos)
{
        ds_seat_t *seat;
        display_stock_cursor_t ctype;

        log_msg(LOG_DEFAULT, LVL_DEBUG, "ds_window_start_resize (%d, %d)",
            (int) pos->x, (int) pos->y);

        if (wnd->state != dsw_idle)
                return;

        wnd->orig_pos = *pos;
        wnd->state = dsw_resizing;
        wnd->rsztype = rsztype;
        wnd->preview_rect = wnd->rect;

        // XXX Need client to tell us which seat started the resize!
        seat = ds_display_first_seat(wnd->display);
        ctype = display_cursor_from_wrsz(rsztype);
        ds_seat_set_wm_cursor(seat, wnd->display->cursor[ctype]);

        (void) ds_window_repaint_preview(wnd, NULL);
}

/** Finish resizing a window by mouse drag.
 *
 * @param wnd Window
 * @param pos Position where mouse button was released
 */
static void ds_window_finish_resize(ds_window_t *wnd, gfx_coord2_t *pos)
{
        gfx_coord2_t dresize;
        gfx_rect_t nrect;
        ds_seat_t *seat;

        log_msg(LOG_DEFAULT, LVL_DEBUG, "ds_window_finish_resize (%d, %d)",
            (int) pos->x, (int) pos->y);

        assert(wnd->state == dsw_resizing);
        gfx_coord2_subtract(pos, &wnd->orig_pos, &dresize);

        /* Compute new rectangle */
        ds_window_calc_resize(wnd, &dresize, &nrect);

        wnd->state = dsw_idle;
        ds_client_post_resize_event(wnd->client, wnd, &nrect);

        // XXX Need to know which seat started the resize!
        seat = ds_display_first_seat(wnd->display);
        ds_seat_set_wm_cursor(seat, NULL);

        (void) ds_display_paint(wnd->display, NULL);
}

/** Update window position when resizing by mouse drag.
 *
 * @param wnd Window
 * @param pos Current mouse position
 */
static void ds_window_update_resize(ds_window_t *wnd, gfx_coord2_t *pos)
{
        gfx_coord2_t dresize;
        gfx_rect_t nrect;
        gfx_rect_t old_rect;

        log_msg(LOG_DEFAULT, LVL_DEBUG, "ds_window_update_resize (%d, %d)",
            (int) pos->x, (int) pos->y);

        assert(wnd->state == dsw_resizing);

        gfx_coord2_subtract(pos, &wnd->orig_pos, &dresize);
        ds_window_calc_resize(wnd, &dresize, &nrect);

        ds_window_get_preview_rect(wnd, &old_rect);
        wnd->preview_rect = nrect;
        (void) ds_window_repaint_preview(wnd, &old_rect);
}

/** Post keyboard event to window.
 *
 * @param wnd Window
 * @param event Event
 *
 * @return EOK on success or an error code
 */
errno_t ds_window_post_kbd_event(ds_window_t *wnd, kbd_event_t *event)
{
        bool alt_or_shift;

        alt_or_shift = event->mods & (KM_SHIFT | KM_ALT);

        if (event->type == KEY_PRESS && alt_or_shift && event->key == KC_F4) {
                /* On Alt-F4 or Shift-F4 send close event to the window */
                ds_client_post_close_event(wnd->client, wnd);
                return EOK;
        }

        return ds_client_post_kbd_event(wnd->client, wnd, event);
}

/** Post position event to window.
 *
 * @param wnd Window
 * @param event Position event
 */
errno_t ds_window_post_pos_event(ds_window_t *wnd, pos_event_t *event)
{
        pos_event_t tevent;
        gfx_coord2_t pos;
        gfx_rect_t drect;
        bool inside;

        log_msg(LOG_DEFAULT, LVL_DEBUG,
            "ds_window_post_pos_event type=%d pos=%d,%d", event->type,
            (int) event->hpos, (int) event->vpos);

        pos.x = event->hpos;
        pos.y = event->vpos;
        gfx_rect_translate(&wnd->dpos, &wnd->rect, &drect);
        inside = gfx_pix_inside_rect(&pos, &drect);

        if (event->type == POS_PRESS && event->btn_num == 2 && inside) {
                ds_window_start_move(wnd, &pos);
                return EOK;
        }

        if (event->type == POS_RELEASE) {
                if (wnd->state == dsw_moving) {
                        ds_window_finish_move(wnd, &pos);
                        return EOK;
                }

                if (wnd->state == dsw_resizing) {
                        ds_window_finish_resize(wnd, &pos);
                        return EOK;
                }
        }

        if (event->type == POS_UPDATE) {
                if (wnd->state == dsw_moving) {
                        ds_window_update_move(wnd, &pos);
                        return EOK;
                }

                if (wnd->state == dsw_resizing) {
                        ds_window_update_resize(wnd, &pos);
                        return EOK;
                }
        }

        /* Transform event coordinates to window-local */
        tevent = *event;
        tevent.hpos -= wnd->dpos.x;
        tevent.vpos -= wnd->dpos.y;

        return ds_client_post_pos_event(wnd->client, wnd, &tevent);
}

/** Post focus event to window.
 *
 * @param wnd Window
 */
errno_t ds_window_post_focus_event(ds_window_t *wnd)
{
        log_msg(LOG_DEFAULT, LVL_DEBUG, "ds_window_post_focus_event");

        return ds_client_post_focus_event(wnd->client, wnd);
}

/** Post unfocus event to window.
 *
 * @param wnd Window
 */
errno_t ds_window_post_unfocus_event(ds_window_t *wnd)
{
        log_msg(LOG_DEFAULT, LVL_DEBUG, "ds_window_post_unfocus_event");

        return ds_client_post_unfocus_event(wnd->client, wnd);
}

/** Start moving a window, detected by client.
 *
 * @param wnd Window
 * @param pos Position where the pointer was when the move started
 *            relative to the window
 * @param event Button press event
 */
void ds_window_move_req(ds_window_t *wnd, gfx_coord2_t *pos)
{
        gfx_coord2_t orig_pos;

        log_msg(LOG_DEFAULT, LVL_DEBUG, "ds_window_move_req (%d, %d)",
            (int) pos->x, (int) pos->y);

        gfx_coord2_add(&wnd->dpos, pos, &orig_pos);
        ds_window_start_move(wnd, &orig_pos);
}

/** Move window.
 *
 * @param wnd Window
 */
void ds_window_move(ds_window_t *wnd, gfx_coord2_t *dpos)
{
        wnd->dpos = *dpos;
        (void) ds_display_paint(wnd->display, NULL);
}

/** Start resizing a window, detected by client.
 *
 * @param wnd Window
 * @param rsztype Resize type (which part of window is being dragged)
 * @param pos Position where the pointer was when the resize started
 *            relative to the window
 * @param event Button press event
 */
void ds_window_resize_req(ds_window_t *wnd, display_wnd_rsztype_t rsztype,
    gfx_coord2_t *pos)
{
        gfx_coord2_t orig_pos;

        log_msg(LOG_DEFAULT, LVL_DEBUG, "ds_window_resize_req (%d, %d, %d)",
            (int) rsztype, (int) pos->x, (int) pos->y);

        gfx_coord2_add(&wnd->dpos, pos, &orig_pos);
        ds_window_start_resize(wnd, rsztype, &orig_pos);
}

/** Resize window.
 *
 * @param wnd Window
 */
errno_t ds_window_resize(ds_window_t *wnd, gfx_coord2_t *offs,
    gfx_rect_t *nrect)
{
        gfx_context_t *dgc;
        gfx_bitmap_params_t bparams;
        gfx_bitmap_t *nbitmap;
        pixelmap_t npixelmap;
        gfx_coord2_t dims;
        gfx_bitmap_alloc_t alloc;
        gfx_coord2_t ndpos;
        errno_t rc;

        dgc = ds_display_get_gc(wnd->display);
        if (dgc != NULL) {
                gfx_bitmap_params_init(&bparams);
                bparams.rect = *nrect;

                rc = gfx_bitmap_create(dgc, &bparams, NULL, &nbitmap);
                if (rc != EOK)
                        return ENOMEM;

                rc = gfx_bitmap_get_alloc(nbitmap, &alloc);
                if (rc != EOK) {
                        gfx_bitmap_destroy(nbitmap);
                        return ENOMEM;
                }

                gfx_rect_dims(nrect, &dims);
                npixelmap.width = dims.x;
                npixelmap.height = dims.y;
                npixelmap.data = alloc.pixels;

                /* TODO: Transfer contents within overlap */

                if (wnd->bitmap != NULL)
                        gfx_bitmap_destroy(wnd->bitmap);

                wnd->bitmap = nbitmap;
                wnd->pixelmap = npixelmap;

                /* Point memory GC to the new bitmap */
                mem_gc_retarget(wnd->mgc, nrect, &alloc);
        }

        gfx_coord2_add(&wnd->dpos, offs, &ndpos);

        wnd->dpos = ndpos;
        wnd->rect = *nrect;

        (void) ds_display_paint(wnd->display, NULL);
        return EOK;
}

/** Compute new window rectangle after resize operation.
 *
 * @param wnd Window which is being resized (in dsw_resizing state and thus
 *            has rsztype set)
 * @param dresize Amount by which to resize
 * @param nrect Place to store new rectangle
 */
void ds_window_calc_resize(ds_window_t *wnd, gfx_coord2_t *dresize,
    gfx_rect_t *nrect)
{
        if ((wnd->rsztype & display_wr_top) != 0) {
                nrect->p0.y = min(wnd->rect.p0.y + dresize->y,
                    wnd->rect.p1.y - wnd->min_size.y);
        } else {
                nrect->p0.y = wnd->rect.p0.y;
        }

        if ((wnd->rsztype & display_wr_left) != 0) {
                nrect->p0.x = min(wnd->rect.p0.x + dresize->x,
                    wnd->rect.p1.x - wnd->min_size.x);
        } else {
                nrect->p0.x = wnd->rect.p0.x;
        }

        if ((wnd->rsztype & display_wr_bottom) != 0) {
                nrect->p1.y = max(wnd->rect.p1.y + dresize->y,
                    wnd->rect.p0.y + wnd->min_size.y);
        } else {
                nrect->p1.y = wnd->rect.p1.y;
        }

        if ((wnd->rsztype & display_wr_right) != 0) {
                nrect->p1.x = max(wnd->rect.p1.x + dresize->x,
                    wnd->rect.p0.x + wnd->min_size.x);
        } else {
                nrect->p1.x = wnd->rect.p1.x;
        }
}

/** Set window cursor.
 *
 * @param wnd Window
 * @return EOK on success, EINVAL if @a cursor is invalid
 */
errno_t ds_window_set_cursor(ds_window_t *wnd, display_stock_cursor_t cursor)
{
        if (cursor >= dcurs_arrow &&
            cursor < (display_stock_cursor_t) dcurs_limit) {
                wnd->cursor = wnd->display->cursor[cursor];
                return EOK;
        } else {
                return EINVAL;
        }
}

/** Window memory GC invalidate callback.
 *
 * This is called by the window's memory GC when a rectangle is modified.
 */
static void ds_window_invalidate_cb(void *arg, gfx_rect_t *rect)
{
        ds_window_t *wnd = (ds_window_t *)arg;
        gfx_rect_t drect;

        /* Repaint the corresponding part of the display */

        gfx_rect_translate(&wnd->dpos, rect, &drect);
        ds_display_lock(wnd->display);
        (void) ds_display_paint(wnd->display, &drect);
        ds_display_unlock(wnd->display);
}

/** Window memory GC update callback.
 *
 * This is called by the window's memory GC when it is to be updated.
 */
static void ds_window_update_cb(void *arg)
{
        ds_window_t *wnd = (ds_window_t *)arg;

        (void) wnd;
}

/** @}
 */