source: mainline/uspace/lib/ui/src/window.c@ d6c4d40

/*
 * Copyright (c) 2021 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 libui
 * @{
 */
/**
 * @file Window
 */

#include <congfx/console.h>
#include <display.h>
#include <errno.h>
#include <gfx/bitmap.h>
#include <gfx/context.h>
#include <gfx/render.h>
#include <io/kbd_event.h>
#include <io/pos_event.h>
#include <mem.h>
#include <memgfx/memgc.h>
#include <stdlib.h>
#include <ui/control.h>
#include <ui/resource.h>
#include <ui/ui.h>
#include <ui/wdecor.h>
#include <ui/window.h>
#include "../private/control.h"
#include "../private/dummygc.h"
#include "../private/resource.h"
#include "../private/ui.h"
#include "../private/wdecor.h"
#include "../private/window.h"

static void dwnd_close_event(void *);
static void dwnd_focus_event(void *);
static void dwnd_kbd_event(void *, kbd_event_t *);
static void dwnd_pos_event(void *, pos_event_t *);
static void dwnd_resize_event(void *, gfx_rect_t *);
static void dwnd_unfocus_event(void *);

static display_wnd_cb_t dwnd_cb = {
        .close_event = dwnd_close_event,
        .focus_event = dwnd_focus_event,
        .kbd_event = dwnd_kbd_event,
        .pos_event = dwnd_pos_event,
        .resize_event = dwnd_resize_event,
        .unfocus_event = dwnd_unfocus_event
};

static void wd_close(ui_wdecor_t *, void *);
static void wd_move(ui_wdecor_t *, void *, gfx_coord2_t *);
static void wd_resize(ui_wdecor_t *, void *, ui_wdecor_rsztype_t,
    gfx_coord2_t *);
static void wd_set_cursor(ui_wdecor_t *, void *, ui_stock_cursor_t);

static ui_wdecor_cb_t wdecor_cb = {
        .close = wd_close,
        .move = wd_move,
        .resize = wd_resize,
        .set_cursor = wd_set_cursor
};

static void ui_window_invalidate(void *, gfx_rect_t *);
static void ui_window_update(void *);
static void ui_window_app_invalidate(void *, gfx_rect_t *);
static void ui_window_app_update(void *);

/** Initialize window parameters structure.
 *
 * Window parameters structure must always be initialized using this function
 * first. By default, the window will be decorated. To get a non-decorated
 * window, one needs to clear ui_wds_decorated
 * (e.g. params->style &= ~ui_wds_decorated).
 *
 * @param params Window parameters structure
 */
void ui_wnd_params_init(ui_wnd_params_t *params)
{
        memset(params, 0, sizeof(ui_wnd_params_t));

        /* Make window decorated by default. */
        params->style = ui_wds_decorated;
}

/** Create new window.
 *
 * @param ui User interface
 * @param params Window parameters
 * @param rwindow Place to store pointer to new window
 * @return EOK on success or an error code
 */
errno_t ui_window_create(ui_t *ui, ui_wnd_params_t *params,
    ui_window_t **rwindow)
{
        ui_window_t *window;
        display_info_t info;
        gfx_coord2_t pos;
        gfx_coord2_t scr_dims;
        display_wnd_params_t dparams;
        display_window_t *dwindow = NULL;
        gfx_context_t *gc = NULL;
        ui_resource_t *res = NULL;
        ui_wdecor_t *wdecor = NULL;
        dummy_gc_t *dgc = NULL;
        gfx_bitmap_params_t bparams;
        gfx_bitmap_alloc_t alloc;
        gfx_bitmap_t *bmp = NULL;
        mem_gc_t *memgc = NULL;
        console_gc_t *cgc = NULL;
        errno_t rc;

        if (ui->root_wnd != NULL)
                return EEXIST;

        window = calloc(1, sizeof(ui_window_t));
        if (window == NULL)
                return ENOMEM;

        display_wnd_params_init(&dparams);
        dparams.rect = params->rect;
        /* Only allow making the window larger */
        gfx_rect_dims(&params->rect, &dparams.min_size);

        if (ui->display != NULL) {
                if (params->placement != ui_wnd_place_default) {
                        rc = display_get_info(ui->display, &info);
                        if (rc != EOK)
                                goto error;
                }

                if (params->placement == ui_wnd_place_full_screen) {
                        /* Make window the size of the screen */
                        gfx_rect_dims(&info.rect, &scr_dims);
                        gfx_coord2_add(&dparams.rect.p0, &scr_dims,
                            &dparams.rect.p1);
                }

                rc = display_window_create(ui->display, &dparams, &dwnd_cb,
                    (void *) window, &dwindow);
                if (rc != EOK)
                        goto error;

                if (params->placement != ui_wnd_place_default) {
                        pos.x = 0;
                        pos.y = 0;

                        switch (params->placement) {
                        case ui_wnd_place_default:
                                assert(false);
                        case ui_wnd_place_top_left:
                        case ui_wnd_place_full_screen:
                                pos.x = info.rect.p0.x - params->rect.p0.x;
                                pos.y = info.rect.p0.y - params->rect.p0.y;
                                break;
                        case ui_wnd_place_top_right:
                                pos.x = info.rect.p1.x - params->rect.p1.x;
                                pos.y = info.rect.p0.y - params->rect.p0.y;
                                break;
                        case ui_wnd_place_bottom_left:
                                pos.x = info.rect.p0.x - params->rect.p0.x;
                                pos.y = info.rect.p1.y - params->rect.p1.y;
                                break;
                        case ui_wnd_place_bottom_right:
                                pos.x = info.rect.p1.x - params->rect.p1.x;
                                pos.y = info.rect.p1.y - params->rect.p1.y;
                                break;
                        }

                        rc = display_window_move(dwindow, &pos);
                        if (rc != EOK)
                                goto error;
                }

                rc = display_window_get_gc(dwindow, &gc);
                if (rc != EOK)
                        goto error;
        } else if (ui->console != NULL) {
                rc = console_gc_create(ui->console, NULL, &cgc);
                if (rc != EOK)
                        goto error;

                gc = console_gc_get_ctx(cgc);
        } else {
                /* Needed for unit tests */
                rc = dummygc_create(&dgc);
                if (rc != EOK)
                        goto error;

                gc = dummygc_get_ctx(dgc);
        }

#ifdef CONFIG_UI_CS_RENDER
        /* Create window bitmap */
        gfx_bitmap_params_init(&bparams);
#ifndef CONFIG_WIN_DOUBLE_BUF
        /* Console does not support direct output */
        if (ui->display != NULL)
                bparams.flags |= bmpf_direct_output;
#endif

        /* Move rectangle so that top-left corner is 0,0 */
        gfx_rect_rtranslate(&params->rect.p0, &params->rect, &bparams.rect);

        rc = gfx_bitmap_create(gc, &bparams, NULL, &bmp);
        if (rc != EOK)
                goto error;

        /* Create memory GC */
        rc = gfx_bitmap_get_alloc(bmp, &alloc);
        if (rc != EOK) {
                gfx_bitmap_destroy(window->app_bmp);
                return rc;
        }

        rc = mem_gc_create(&bparams.rect, &alloc, ui_window_invalidate,
            ui_window_update, (void *) window, &memgc);
        if (rc != EOK) {
                gfx_bitmap_destroy(window->app_bmp);
                return rc;
        }

        window->bmp = bmp;
        window->mgc = memgc;
        window->gc = mem_gc_get_ctx(memgc);
        window->realgc = gc;
#else
        (void) ui_window_update;
        (void) ui_window_invalidate;
        (void) alloc;
        (void) bparams;
        window->gc = gc;
#endif
        window->cgc = cgc;

        rc = ui_resource_create(window->gc, ui_is_textmode(ui), &res);
        if (rc != EOK)
                goto error;

        rc = ui_wdecor_create(res, params->caption, params->style, &wdecor);
        if (rc != EOK)
                goto error;

        ui_wdecor_set_rect(wdecor, &dparams.rect);
        ui_wdecor_set_cb(wdecor, &wdecor_cb, (void *) window);
        ui_wdecor_paint(wdecor);

        window->ui = ui;
        window->dwindow = dwindow;
        window->rect = dparams.rect;

        window->res = res;
        window->wdecor = wdecor;
        window->cursor = ui_curs_arrow;
        *rwindow = window;

        ui->root_wnd = window;
        return EOK;
error:
        if (wdecor != NULL)
                ui_wdecor_destroy(wdecor);
        if (res != NULL)
                ui_resource_destroy(res);
        if (memgc != NULL)
                mem_gc_delete(memgc);
        if (bmp != NULL)
                gfx_bitmap_destroy(bmp);
        if (dgc != NULL)
                dummygc_destroy(dgc);
        if (cgc != NULL)
                console_gc_delete(cgc);
        if (dwindow != NULL)
                display_window_destroy(dwindow);
        free(window);
        return rc;
}

/** Destroy window.
 *
 * @param window Window or @c NULL
 */
void ui_window_destroy(ui_window_t *window)
{
        if (window == NULL)
                return;

        ui_control_destroy(window->control);
        ui_wdecor_destroy(window->wdecor);
        ui_resource_destroy(window->res);
        if (0 && window->app_mgc != NULL)
                mem_gc_delete(window->app_mgc);
        if (0 && window->app_bmp != NULL)
                gfx_bitmap_destroy(window->app_bmp);
        if (window->mgc != NULL) {
                mem_gc_delete(window->mgc);
                window->gc = NULL;
        }
        if (window->bmp != NULL)
                gfx_bitmap_destroy(window->bmp);
        gfx_context_delete(window->gc);
        if (window->dwindow != NULL)
                display_window_destroy(window->dwindow);
        if (window->cgc != NULL)
                console_gc_delete(window->cgc);
        free(window);
}

/** Add control to window.
 *
 * Only one control can be added to a window. If more than one control
 * is added, the results are undefined.
 *
 * @param fixed Fixed layout
 * @param control Control
 * @return EOK on success, ENOMEM if out of memory
 */
void ui_window_add(ui_window_t *window, ui_control_t *control)
{
        assert(window->control == NULL);

        window->control = control;
        control->elemp = (void *) window;
}

/** Remove control from window.
 *
 * @param window Window
 * @param control Control
 */
void ui_window_remove(ui_window_t *window, ui_control_t *control)
{
        assert(window->control == control);
        assert((ui_window_t *) control->elemp == window);

        window->control = NULL;
        control->elemp = NULL;
}

/** Resize/move window.
 *
 * Resize window to the dimensions of @a rect. If @a rect.p0 is not 0,0,
 * the top-left corner of the window will move on the screen accordingly.
 *
 * @param window Window
 * @param rect Rectangle
 *
 * @return EOK on success or an error code
 */
errno_t ui_window_resize(ui_window_t *window, gfx_rect_t *rect)
{
        gfx_coord2_t offs;
        gfx_rect_t nrect;
        gfx_rect_t arect;
        gfx_bitmap_t *app_bmp = NULL;
        gfx_bitmap_t *win_bmp = NULL;
        gfx_bitmap_params_t app_params;
        gfx_bitmap_params_t win_params;
        gfx_bitmap_alloc_t app_alloc;
        gfx_bitmap_alloc_t win_alloc;
        errno_t rc;

        /*
         * Move rect so that p0=0,0 - keep window's coordinate system origin
         * locked to top-left corner of the window.
         */
        offs = rect->p0;
        gfx_rect_rtranslate(&offs, rect, &nrect);

        /* mgc != NULL iff client-side rendering */
        if (window->mgc != NULL) {
                /* Resize window bitmap */
                assert(window->bmp != NULL);

                gfx_bitmap_params_init(&win_params);
#ifndef CONFIG_WIN_DOUBLE_BUF
                win_params.flags |= bmpf_direct_output;
#endif
                win_params.rect = nrect;

                rc = gfx_bitmap_create(window->realgc, &win_params, NULL,
                    &win_bmp);
                if (rc != EOK)
                        goto error;

                rc = gfx_bitmap_get_alloc(win_bmp, &win_alloc);
                if (rc != EOK)
                        goto error;
        }

        /* Application area GC? */
        if (window->app_gc != NULL) {
                /* Resize application bitmap */
                assert(window->app_bmp != NULL);

                gfx_bitmap_params_init(&app_params);

                /*
                 * The bitmap will have the same dimensions as the
                 * application rectangle, but start at 0,0.
                 */
                ui_wdecor_app_from_rect(window->wdecor->style, &nrect, &arect);
                gfx_rect_rtranslate(&arect.p0, &arect, &app_params.rect);

                rc = gfx_bitmap_create(window->gc, &app_params, NULL,
                    &app_bmp);
                if (rc != EOK)
                        goto error;

                rc = gfx_bitmap_get_alloc(app_bmp, &app_alloc);
                if (rc != EOK)
                        goto error;
        }

        /* dwindow can be NULL in case of unit tests */
        if (window->dwindow != NULL) {
                rc = display_window_resize(window->dwindow, &offs, &nrect);
                if (rc != EOK)
                        goto error;
        }

        /* CLient side rendering? */
        if (window->mgc != NULL) {
                mem_gc_retarget(window->mgc, &win_params.rect, &win_alloc);

                gfx_bitmap_destroy(window->bmp);
                window->bmp = win_bmp;
        }

        ui_wdecor_set_rect(window->wdecor, &nrect);
        ui_wdecor_paint(window->wdecor);
        gfx_update(window->gc);

        /* Application area GC? */
        if (window->app_gc != NULL) {
                mem_gc_retarget(window->app_mgc, &app_params.rect, &app_alloc);

                gfx_bitmap_destroy(window->app_bmp);
                window->app_bmp = app_bmp;
        }

        return EOK;
error:
        if (app_bmp != NULL)
                gfx_bitmap_destroy(app_bmp);
        if (win_bmp != NULL)
                gfx_bitmap_destroy(win_bmp);
        return rc;
}

/** Set window callbacks.
 *
 * @param window Window
 * @param cb Window decoration callbacks
 * @param arg Callback argument
 */
void ui_window_set_cb(ui_window_t *window, ui_window_cb_t *cb, void *arg)
{
        window->cb = cb;
        window->arg = arg;
}

/** Get UI resource from window.
 *
 * @param window Window
 * @return UI resource
 */
ui_resource_t *ui_window_get_res(ui_window_t *window)
{
        return window->res;
}

/** Get window GC.
 *
 * @param window Window
 * @return GC (relative to window)
 */
gfx_context_t *ui_window_get_gc(ui_window_t *window)
{
        return window->gc;
}

/** Get window application area GC
 *
 * @param window Window
 * @param rgc Place to store GC (relative to application area)
 * @return EOK on success or an error code
 */
errno_t ui_window_get_app_gc(ui_window_t *window, gfx_context_t **rgc)
{
        gfx_bitmap_params_t params;
        gfx_bitmap_alloc_t alloc;
        gfx_rect_t rect;
        mem_gc_t *memgc;
        errno_t rc;

        if (window->app_gc == NULL) {
                assert(window->app_bmp == NULL);

                gfx_bitmap_params_init(&params);

                /*
                 * The bitmap will have the same dimensions as the
                 * application rectangle, but start at 0,0.
                 */
                ui_window_get_app_rect(window, &rect);
                gfx_rect_rtranslate(&rect.p0, &rect, &params.rect);

                rc = gfx_bitmap_create(window->gc, &params, NULL,
                    &window->app_bmp);
                if (rc != EOK)
                        return rc;

                rc = gfx_bitmap_get_alloc(window->app_bmp, &alloc);
                if (rc != EOK) {
                        gfx_bitmap_destroy(window->app_bmp);
                        return rc;
                }

                rc = mem_gc_create(&params.rect, &alloc, ui_window_app_invalidate,
                    ui_window_app_update, (void *) window, &memgc);
                if (rc != EOK) {
                        gfx_bitmap_destroy(window->app_bmp);
                        return rc;
                }

                window->app_mgc = memgc;
                window->app_gc = mem_gc_get_ctx(memgc);
        }

        *rgc = window->app_gc;
        return EOK;
}

/** Get window application rectangle
 *
 * @param window Window
 * @param rect Place to store application rectangle
 */
void ui_window_get_app_rect(ui_window_t *window, gfx_rect_t *rect)
{
        ui_wdecor_geom_t geom;

        ui_wdecor_get_geom(window->wdecor, &geom);
        *rect = geom.app_area_rect;
}

/** Paint window
 *
 * @param window Window
 * @return EOK on success or an error code
 */
errno_t ui_window_paint(ui_window_t *window)
{
        return ui_window_send_paint(window);
}

/** Handle window close event. */
static void dwnd_close_event(void *arg)
{
        ui_window_t *window = (ui_window_t *) arg;

        ui_window_send_close(window);
}

/** Handle window focus event. */
static void dwnd_focus_event(void *arg)
{
        ui_window_t *window = (ui_window_t *) arg;

        if (window->wdecor != NULL) {
                ui_wdecor_set_active(window->wdecor, true);
                ui_wdecor_paint(window->wdecor);
        }

        ui_window_send_focus(window);
}

/** Handle window keyboard event */
static void dwnd_kbd_event(void *arg, kbd_event_t *kbd_event)
{
        ui_window_t *window = (ui_window_t *) arg;

        (void) window;
        ui_window_send_kbd(window, kbd_event);
}

/** Handle window position event */
static void dwnd_pos_event(void *arg, pos_event_t *event)
{
        ui_window_t *window = (ui_window_t *) arg;

        /* Make sure we don't process events until fully initialized */
        if (window->wdecor == NULL)
                return;

        ui_wdecor_pos_event(window->wdecor, event);
        ui_window_send_pos(window, event);
}

/** Handle window resize event */
static void dwnd_resize_event(void *arg, gfx_rect_t *rect)
{
        ui_window_t *window = (ui_window_t *) arg;

        /* Make sure we don't process events until fully initialized */
        if (window->wdecor == NULL)
                return;

        if ((window->wdecor->style & ui_wds_resizable) == 0)
                return;

        (void) ui_window_resize(window, rect);
        (void) ui_window_paint(window);
}

/** Handle window unfocus event. */
static void dwnd_unfocus_event(void *arg)
{
        ui_window_t *window = (ui_window_t *) arg;

        if (window->wdecor != NULL) {
                ui_wdecor_set_active(window->wdecor, false);
                ui_wdecor_paint(window->wdecor);
        }

        ui_window_send_unfocus(window);
}

/** Window decoration requested window closure.
 *
 * @param wdecor Window decoration
 * @param arg Argument (window)
 */
static void wd_close(ui_wdecor_t *wdecor, void *arg)
{
        ui_window_t *window = (ui_window_t *) arg;

        ui_window_send_close(window);
}

/** Window decoration requested window move.
 *
 * @param wdecor Window decoration
 * @param arg Argument (window)
 * @param pos Position where the title bar was pressed
 */
static void wd_move(ui_wdecor_t *wdecor, void *arg, gfx_coord2_t *pos)
{
        ui_window_t *window = (ui_window_t *) arg;

        if (window->dwindow != NULL)
                (void) display_window_move_req(window->dwindow, pos);
}

/** Window decoration requested window resize.
 *
 * @param wdecor Window decoration
 * @param arg Argument (window)
 * @param rsztype Resize type
 * @param pos Position where the button was pressed
 */
static void wd_resize(ui_wdecor_t *wdecor, void *arg,
    ui_wdecor_rsztype_t rsztype, gfx_coord2_t *pos)
{
        ui_window_t *window = (ui_window_t *) arg;

        if (window->dwindow != NULL)
                (void) display_window_resize_req(window->dwindow, rsztype, pos);
}

/** Window decoration requested changing cursor.
 *
 * @param wdecor Window decoration
 * @param arg Argument (window)
 * @param cursor Cursor to set
 */
static void wd_set_cursor(ui_wdecor_t *wdecor, void *arg,
    ui_stock_cursor_t cursor)
{
        ui_window_t *window = (ui_window_t *) arg;
        display_stock_cursor_t dcursor;

        if (cursor == window->cursor)
                return;

        dcursor = dcurs_arrow;

        switch (cursor) {
        case ui_curs_arrow:
                dcursor = dcurs_arrow;
                break;
        case ui_curs_size_ud:
                dcursor = dcurs_size_ud;
                break;
        case ui_curs_size_lr:
                dcursor = dcurs_size_lr;
                break;
        case ui_curs_size_uldr:
                dcursor = dcurs_size_uldr;
                break;
        case ui_curs_size_urdl:
                dcursor = dcurs_size_urdl;
                break;
        }

        if (window->dwindow != NULL)
                (void) display_window_set_cursor(window->dwindow, dcursor);
        window->cursor = cursor;
}

/** Send window close event.
 *
 * @param window Window
 */
void ui_window_send_close(ui_window_t *window)
{
        if (window->cb != NULL && window->cb->close != NULL)
                window->cb->close(window, window->arg);
}

/** Send window focus event.
 *
 * @param window Window
 */
void ui_window_send_focus(ui_window_t *window)
{
        if (window->cb != NULL && window->cb->focus != NULL)
                window->cb->focus(window, window->arg);
}

/** Send window keyboard event.
 *
 * @param window Window
 */
void ui_window_send_kbd(ui_window_t *window, kbd_event_t *kbd)
{
        if (window->cb != NULL && window->cb->kbd != NULL)
                window->cb->kbd(window, window->arg, kbd);
}

/** Send window paint event.
 *
 * @param window Window
 */
errno_t ui_window_send_paint(ui_window_t *window)
{
        if (window->cb != NULL && window->cb->paint != NULL)
                return window->cb->paint(window, window->arg);
        else
                return ui_window_def_paint(window);
}

/** Send window position event.
 *
 * @param window Window
 */
void ui_window_send_pos(ui_window_t *window, pos_event_t *pos)
{
        if (window->cb != NULL && window->cb->pos != NULL)
                window->cb->pos(window, window->arg, pos);
        else
                ui_window_def_pos(window, pos);
}

/** Send window unfocus event.
 *
 * @param window Window
 */
void ui_window_send_unfocus(ui_window_t *window)
{
        if (window->cb != NULL && window->cb->unfocus != NULL)
                window->cb->unfocus(window, window->arg);
}

/** Default window paint routine.
 *
 * @param window Window
 * @return EOK on success or an error code
 */
errno_t ui_window_def_paint(ui_window_t *window)
{
        gfx_rect_t app_rect;
        errno_t rc;

        rc = gfx_set_color(window->gc, window->res->wnd_face_color);
        if (rc != EOK)
                return rc;

        ui_window_get_app_rect(window, &app_rect);

        rc = gfx_fill_rect(window->gc, &app_rect);
        if (rc != EOK)
                return rc;

        if (window->control != NULL)
                return ui_control_paint(window->control);

        rc = gfx_update(window->res->gc);
        if (rc != EOK)
                return rc;

        return EOK;
}

/** Default window position event routine.
 *
 * @param window Window
 * @return EOK on success or an error code
 */
void ui_window_def_pos(ui_window_t *window, pos_event_t *pos)
{
        if (window->control != NULL)
                ui_control_pos_event(window->control, pos);
}

/** Window invalidate callback
 *
 * @param arg Argument (ui_window_t *)
 * @param rect Rectangle to update
 */
static void ui_window_invalidate(void *arg, gfx_rect_t *rect)
{
        ui_window_t *window = (ui_window_t *) arg;
        gfx_rect_t env;

        gfx_rect_envelope(&window->dirty_rect, rect, &env);
        window->dirty_rect = env;
}

/** Window update callback
 *
 * @param arg Argument (ui_window_t *)
 */
static void ui_window_update(void *arg)
{
        ui_window_t *window = (ui_window_t *) arg;

        if (!gfx_rect_is_empty(&window->dirty_rect))
                (void) gfx_bitmap_render(window->bmp, &window->dirty_rect, NULL);

        window->dirty_rect.p0.x = 0;
        window->dirty_rect.p0.y = 0;
        window->dirty_rect.p1.x = 0;
        window->dirty_rect.p1.y = 0;
}

/** Application area invalidate callback
 *
 * @param arg Argument (ui_window_t *)
 * @param rect Rectangle to update
 */
static void ui_window_app_invalidate(void *arg, gfx_rect_t *rect)
{
        ui_window_t *window = (ui_window_t *) arg;
        gfx_rect_t arect;

        ui_window_get_app_rect(window, &arect);

        /* Render bitmap rectangle inside the application area */
        (void) gfx_bitmap_render(window->app_bmp, rect, &arect.p0);
        /*
         * TODO Update applications to call gfx_update(), then
         * we can defer update to ui_window_app_update().
         */
        (void) gfx_update(window->res->gc);
}

/** Application area update callback
 *
 * @param arg Argument (ui_window_t *)
 */
static void ui_window_app_update(void *arg)
{
        ui_window_t *window = (ui_window_t *) arg;

        /*
         * Not used since display is updated immediately
         * in ui_window_app_invalidate
         */
        (void) window;
}

/** @}
 */