HelenOS sources

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
demo_is_text
demo_msleep
clear_scr
demo_font_init
demo_font_fini
demo_begin
demo_rects
bitmap_tartan
bitmap_moire
bitmap_circle
demo_bitmap
demo_bitmap2
demo_bitmap_kc
demo_text
demo_text_abbr
demo_clip
demo_loop
demo_console
demo_ui_fibril
demo_ui
demo_display
demo_quit
wnd_close_event
demo_kbd_event
wnd_kbd_event
uiwnd_close_event
uiwnd_kbd_event
print_syntax
main
/*
 * Copyright (c) 2025 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 gfxdemo
 * @{
 */
/** @file Graphic demo
 */

#include <congfx/console.h>
#include <display.h>
#include <fibril.h>
#include <gfx/bitmap.h>
#include <gfx/color.h>
#include <gfx/render.h>
#include <gfx/font.h>
#include <gfx/text.h>
#include <gfx/typeface.h>
#include <io/console.h>
#include <io/pixelmap.h>
#include <stdbool.h>
#include <stdlib.h>
#include <str.h>
#include <task.h>
#include <ui/ui.h>
#include <ui/window.h>
#include <ui/wdecor.h>
#include "gfxdemo.h"

static void wnd_close_event(void *);
static void wnd_kbd_event(void *, kbd_event_t *);

static display_wnd_cb_t wnd_cb = {
        .close_event = wnd_close_event,
        .kbd_event = wnd_kbd_event
};

static void uiwnd_close_event(ui_window_t *, void *);
static void uiwnd_kbd_event(ui_window_t *, void *, kbd_event_t *);

static ui_window_cb_t ui_window_cb = {
        .close = uiwnd_close_event,
        .kbd = uiwnd_kbd_event
};

static void demo_kbd_event(kbd_event_t *);

static bool quit = false;
static FIBRIL_MUTEX_INITIALIZE(quit_lock);
static FIBRIL_CONDVAR_INITIALIZE(quit_cv);
static gfx_typeface_t *tface;
static gfx_font_t *font;
static gfx_coord_t vpad;
static console_ctrl_t *con = NULL;
static bool textmode;
static ui_t *ui;

/** Determine if we are running in text mode.
 *
 * @return @c true iff we are running in text mode
 */
static bool demo_is_text(void)
{
        return textmode;
}

/** Sleep until timeout or quit request.
 *
 * @param msec Number of microseconds to sleep for
 */
static void demo_msleep(unsigned msec)
{
        errno_t rc;
        usec_t usec;
        cons_event_t cevent;

        if (ui != NULL)
                ui_unlock(ui);
        fibril_mutex_lock(&quit_lock);
        if (!quit) {
                if (con != NULL) {
                        usec = (usec_t)msec * 1000;
                        while (usec > 0 && !quit) {
                                rc = console_get_event_timeout(con, &cevent, &usec);
                                if (rc == EOK) {
                                        if (cevent.type == CEV_KEY) {
                                                fibril_mutex_unlock(&quit_lock);
                                                demo_kbd_event(&cevent.ev.key);
                                                fibril_mutex_lock(&quit_lock);
                                        }
                                }
                        }
                } else {
                        (void) fibril_condvar_wait_timeout(&quit_cv, &quit_lock,
                            (usec_t)msec * 1000);
                }
        }
        fibril_mutex_unlock(&quit_lock);
        if (ui != NULL)
                ui_lock(ui);
}

/** Clear screen.
 *
 * @param gc Graphic context
 * @param w Screen width
 * @param h Screen height
 */
static errno_t clear_scr(gfx_context_t *gc, gfx_coord_t w, gfx_coord_t h)
{
        gfx_color_t *color = NULL;
        gfx_rect_t rect;
        errno_t rc;

        rc = gfx_color_new_rgb_i16(0, 0, 0, &color);
        if (rc != EOK)
                goto error;

        rc = gfx_set_color(gc, color);
        if (rc != EOK)
                goto error;

        rect.p0.x = 0;
        rect.p0.y = 0;
        rect.p1.x = w;
        rect.p1.y = h;

        rc = gfx_fill_rect(gc, &rect);
        if (rc != EOK)
                goto error;

        gfx_color_delete(color);
        return EOK;
error:
        if (color != NULL)
                gfx_color_delete(color);
        return rc;
}

/** Initialize demo font.
 *
 * @param gc Graphic context
 * @param w Width
 * @param h Height
 * @return EOK on success or an error code
 */
static errno_t demo_font_init(gfx_context_t *gc, gfx_coord_t w, gfx_coord_t h)
{
        gfx_font_info_t *finfo;
        errno_t rc;

        if (quit)
                return EOK;

        /* XXX Crude way of detecting text mode */
        if (demo_is_text()) {
                /* Create dummy font for text mode */
                rc = gfx_typeface_create(gc, &tface);
                if (rc != EOK) {
                        printf("Error creating typeface\n");
                        goto error;
                }

                rc = gfx_font_create_textmode(tface, &font);
                if (rc != EOK) {
                        printf("Error creating font\n");
                        goto error;
                }

                vpad = 0;
        } else {
                /* Load font */
                rc = gfx_typeface_open(gc, "/data/font/helena.tpf", &tface);
                if (rc != EOK) {
                        printf("Error opening typeface\n");
                        goto error;
                }

                finfo = gfx_typeface_first_font(tface);
                if (finfo == NULL) {
                        printf("Typeface contains no font.\n");
                        rc = ENOENT;
                        goto error;
                }

                rc = gfx_font_open(finfo, &font);
                if (rc != EOK) {
                        printf("Error opening font.\n");
                        goto error;
                }

                vpad = 5;
        }

        return EOK;
error:
        if (tface != NULL)
                gfx_typeface_destroy(tface);
        return rc;
}

/** Finalize demo font. */
static void demo_font_fini(void)
{
        if (font == NULL)
                return;

        gfx_font_close(font);
        font = NULL;

        gfx_typeface_destroy(tface);
        tface = NULL;
}

/** Start a new demo screen.
 *
 * Clear the screen, display a status line and set up clipping.
 *
 * @param gc Graphic context
 * @param w Width
 * @param h Height
 * @param text Demo screen description
 * @return EOK on success or an error code
 */
static errno_t demo_begin(gfx_context_t *gc, gfx_coord_t w, gfx_coord_t h,
    const char *text)
{
        gfx_text_fmt_t fmt;
        gfx_font_metrics_t metrics;
        gfx_coord2_t pos;
        gfx_color_t *color;
        gfx_rect_t rect;
        gfx_coord_t height;
        errno_t rc;

        rc = gfx_set_clip_rect(gc, NULL);
        if (rc != EOK)
                return rc;

        rc = clear_scr(gc, w, h);
        if (rc != EOK)
                return rc;

        if (font != NULL) {
                if (demo_is_text()) {
                        rc = gfx_color_new_ega(0x1e, &color);
                        if (rc != EOK)
                                goto error;
                } else {
                        rc = gfx_color_new_rgb_i16(0xffff, 0xffff, 0xffff, &color);
                        if (rc != EOK)
                                goto error;
                }

                gfx_text_fmt_init(&fmt);
                fmt.font = font;
                fmt.color = color;
                fmt.halign = gfx_halign_center;
                fmt.valign = gfx_valign_bottom;

                pos.x = w / 2;
                pos.y = h;
                rc = gfx_puttext(&pos, &fmt, text);
                if (rc != EOK) {
                        printf("Error rendering text.\n");
                        gfx_color_delete(color);
                        goto error;
                }

                gfx_color_delete(color);

                gfx_font_get_metrics(font, &metrics);
                height = metrics.ascent + metrics.descent + 1;
        } else {
                height = 0;
        }

        rect.p0.x = 0;
        rect.p0.y = 0;
        rect.p1.x = w;
        rect.p1.y = h - height - vpad;
        rc = gfx_set_clip_rect(gc, &rect);
        if (rc != EOK)
                return rc;

        return EOK;
error:
        return rc;
}

/** Run rectangle demo on a graphic context.
 *
 * @param gc Graphic context
 * @param w Width
 * @param h Height
 */
static errno_t demo_rects(gfx_context_t *gc, gfx_coord_t w, gfx_coord_t h)
{
        gfx_color_t *color = NULL;
        gfx_rect_t rect;
        int i, j;
        errno_t rc;

        if (quit)
                return EOK;

        rc = demo_begin(gc, w, h, "Rectangle rendering");
        if (rc != EOK)
                return rc;

        for (j = 0; j < 10; j++) {
                rc = gfx_color_new_rgb_i16(rand() % 0x10000, rand() % 0x10000,
                    rand() % 0x10000, &color);
                if (rc != EOK)
                        return rc;

                rc = gfx_set_color(gc, color);
                if (rc != EOK)
                        return rc;

                for (i = 0; i < 10; i++) {
                        rect.p0.x = rand() % (w - 1);
                        rect.p0.y = rand() % (h - 1);
                        rect.p1.x = rect.p0.x + rand() % (w - 1 - rect.p0.x);
                        rect.p1.y = rect.p0.y + rand() % (h - 1 - rect.p0.y);

                        rc = gfx_fill_rect(gc, &rect);
                        if (rc != EOK)
                                return rc;
                }

                gfx_color_delete(color);

                demo_msleep(500);
                if (quit)
                        break;
        }

        return EOK;
}

/** Fill bitmap with tartan pattern.
 *
 * @param bitmap Bitmap
 * @param w Bitmap width
 * @param h Bitmap height
 * @return EOK on success or an error code
 */
static errno_t bitmap_tartan(gfx_bitmap_t *bitmap, gfx_coord_t w, gfx_coord_t h)
{
        int i, j;
        pixelmap_t pixelmap;
        gfx_bitmap_alloc_t alloc;
        errno_t rc;

        rc = gfx_bitmap_get_alloc(bitmap, &alloc);
        if (rc != EOK)
                return rc;

        /* In absence of anything else, use pixelmap */
        pixelmap.width = w;
        pixelmap.height = h;
        pixelmap.data = alloc.pixels;

        for (i = 0; i < w; i++) {
                for (j = 0; j < h; j++) {
                        pixelmap_put_pixel(&pixelmap, i, j,
                            PIXEL(255, (i % 30) < 3 ? 255 : 0,
                            (j % 30) < 3 ? 255 : 0, i / 2));
                }
        }

        return EOK;
}

/** Fill bitmap with moire pattern.
 *
 * @param bitmap Bitmap
 * @param w Bitmap width
 * @param h Bitmap height
 * @return EOK on success or an error code
 */
static errno_t bitmap_moire(gfx_bitmap_t *bitmap, gfx_coord_t w, gfx_coord_t h)
{
        int i, j;
        int k;
        pixelmap_t pixelmap;
        gfx_bitmap_alloc_t alloc;
        errno_t rc;

        rc = gfx_bitmap_get_alloc(bitmap, &alloc);
        if (rc != EOK)
                return rc;

        /* In absence of anything else, use pixelmap */
        pixelmap.width = w;
        pixelmap.height = h;
        pixelmap.data = alloc.pixels;

        for (i = 0; i < w; i++) {
                for (j = 0; j < h; j++) {
                        k = i * i + j * j;
                        pixelmap_put_pixel(&pixelmap, i, j,
                            PIXEL(255, k, k, k));
                }
        }

        return EOK;
}

/** Render circle to a bitmap.
 *
 * @param bitmap Bitmap
 * @param w Bitmap width
 * @param h Bitmap height
 * @return EOK on success or an error code
 */
static errno_t bitmap_circle(gfx_bitmap_t *bitmap, gfx_coord_t w, gfx_coord_t h)
{
        int i, j;
        int k;
        pixelmap_t pixelmap;
        gfx_bitmap_alloc_t alloc;
        errno_t rc;

        rc = gfx_bitmap_get_alloc(bitmap, &alloc);
        if (rc != EOK)
                return rc;

        /* In absence of anything else, use pixelmap */
        pixelmap.width = w;
        pixelmap.height = h;
        pixelmap.data = alloc.pixels;

        for (i = 0; i < w; i++) {
                for (j = 0; j < h; j++) {
                        k = i * i + j * j;
                        pixelmap_put_pixel(&pixelmap, i, j,
                            k < w * w / 2 ? PIXEL(255, 0, 255, 0) :
                            PIXEL(255, 255, 0, 255));
                }
        }

        return EOK;
}

/** Run bitmap demo on a graphic context.
 *
 * @param gc Graphic context
 * @param w Width
 * @param h Height
 */
static errno_t demo_bitmap(gfx_context_t *gc, gfx_coord_t w, gfx_coord_t h)
{
        gfx_bitmap_t *bitmap;
        gfx_bitmap_params_t params;
        int i, j;
        gfx_coord2_t offs;
        gfx_rect_t srect;
        errno_t rc;

        if (quit)
                return EOK;

        rc = demo_begin(gc, w, h, "Bitmap rendering without offset");
        if (rc != EOK)
                return rc;

        gfx_bitmap_params_init(&params);
        params.rect.p0.x = 0;
        params.rect.p0.y = 0;
        params.rect.p1.x = w;
        params.rect.p1.y = h;

        rc = gfx_bitmap_create(gc, &params, NULL, &bitmap);
        if (rc != EOK)
                return rc;

        rc = bitmap_tartan(bitmap, w, h);
        if (rc != EOK)
                goto error;

        for (j = 0; j < 10; j++) {
                for (i = 0; i < 5; i++) {
                        srect.p0.x = rand() % (w - 40);
                        srect.p0.y = rand() % (h - 20);
                        srect.p1.x = srect.p0.x + rand() % (w - srect.p0.x);
                        srect.p1.y = srect.p0.y + rand() % (h - srect.p0.y);
                        offs.x = 0;
                        offs.y = 0;

                        rc = gfx_bitmap_render(bitmap, &srect, &offs);
                        if (rc != EOK)
                                goto error;

                        demo_msleep(250);
                        if (quit)
                                goto out;
                }
        }

out:
        gfx_bitmap_destroy(bitmap);

        return EOK;
error:
        gfx_bitmap_destroy(bitmap);
        return rc;
}

/** Run second bitmap demo on a graphic context.
 *
 * @param gc Graphic context
 * @param w Width
 * @param h Height
 */
static errno_t demo_bitmap2(gfx_context_t *gc, gfx_coord_t w, gfx_coord_t h)
{
        gfx_bitmap_t *bitmap;
        gfx_bitmap_params_t params;
        int i, j;
        gfx_coord2_t offs;
        errno_t rc;

        if (quit)
                return EOK;

        rc = demo_begin(gc, w, h, "Bitmap rendering with offset");
        if (rc != EOK)
                return rc;

        gfx_bitmap_params_init(&params);
        params.rect.p0.x = 0;
        params.rect.p0.y = 0;
        params.rect.p1.x = 40;
        params.rect.p1.y = 20;

        rc = gfx_bitmap_create(gc, &params, NULL, &bitmap);
        if (rc != EOK)
                return rc;

        rc = bitmap_moire(bitmap, 40, 20);
        if (rc != EOK)
                goto error;

        for (j = 0; j < 10; j++) {
                for (i = 0; i < 10; i++) {
                        offs.x = rand() % (w - 40);
                        offs.y = rand() % (h - 20);

                        rc = gfx_bitmap_render(bitmap, NULL, &offs);
                        if (rc != EOK)
                                goto error;
                }

                demo_msleep(500);
                if (quit)
                        break;
        }

        gfx_bitmap_destroy(bitmap);

        return EOK;
error:
        gfx_bitmap_destroy(bitmap);
        return rc;
}

/** Run bitmap color key demo on a graphic context.
 *
 * @param gc Graphic context
 * @param w Width
 * @param h Height
 */
static errno_t demo_bitmap_kc(gfx_context_t *gc, gfx_coord_t w, gfx_coord_t h)
{
        gfx_bitmap_t *bitmap;
        gfx_bitmap_params_t params;
        int i, j;
        gfx_coord2_t offs;
        errno_t rc;

        if (quit)
                return EOK;

        rc = demo_begin(gc, w, h, "Bitmap rendering with color key");
        if (rc != EOK)
                return rc;

        gfx_bitmap_params_init(&params);
        params.rect.p0.x = 0;
        params.rect.p0.y = 0;
        params.rect.p1.x = 40;
        params.rect.p1.y = 40;
        params.flags = bmpf_color_key;
        params.key_color = PIXEL(255, 255, 0, 255);

        rc = gfx_bitmap_create(gc, &params, NULL, &bitmap);
        if (rc != EOK)
                return rc;

        rc = bitmap_circle(bitmap, 40, 40);
        if (rc != EOK)
                goto error;

        for (j = 0; j < 10; j++) {
                for (i = 0; i < 10; i++) {
                        offs.x = j * 20 + i * 20;
                        offs.y = i * 20;

                        rc = gfx_bitmap_render(bitmap, NULL, &offs);
                        if (rc != EOK)
                                goto error;
                }

                demo_msleep(500);
                if (quit)
                        break;
        }

        gfx_bitmap_destroy(bitmap);

        return EOK;
error:
        gfx_bitmap_destroy(bitmap);
        return rc;
}

/** Run text demo on a graphic context.
 *
 * @param gc Graphic context
 * @param w Width
 * @param h Height
 */
static errno_t demo_text(gfx_context_t *gc, gfx_coord_t w, gfx_coord_t h)
{
        gfx_color_t *color = NULL;
        gfx_rect_t rect;
        gfx_coord2_t pos;
        gfx_text_fmt_t fmt;
        int i;
        errno_t rc;

        if (quit)
                return EOK;

        rc = demo_begin(gc, w, h, "Text rendering");
        if (rc != EOK)
                goto error;

        /* Vertical bars */

        for (i = 0; i < 20; i++) {
                rc = gfx_color_new_rgb_i16(0, 0x8000 * i / 20,
                    0x8000 * i / 20, &color);
                if (rc != EOK)
                        goto error;

                rc = gfx_set_color(gc, color);
                if (rc != EOK)
                        goto error;

                rect.p0.x = w * i / 20;
                rect.p0.y = 0;
                rect.p1.x = w * (i + 1) / 20;
                rect.p1.y = h;

                rc = gfx_fill_rect(gc, &rect);
                if (rc != EOK)
                        goto error;

                gfx_color_delete(color);
        }

        rc = gfx_color_new_rgb_i16(0, 0, 0x8000, &color);
        if (rc != EOK)
                goto error;

        rc = gfx_set_color(gc, color);
        if (rc != EOK)
                goto error;

        rect.p0.x = w / 20;
        rect.p0.y = 1 * h / 15;
        rect.p1.x = w - w / 20;
        rect.p1.y = 4 * h / 15;

        rc = gfx_fill_rect(gc, &rect);
        if (rc != EOK)
                goto error;

        gfx_color_delete(color);

        if (demo_is_text()) {
                rc = gfx_color_new_ega(0x1f, &color);
                if (rc != EOK)
                        goto error;
        } else {
                rc = gfx_color_new_rgb_i16(0xffff, 0xffff, 0xffff, &color);
                if (rc != EOK)
                        goto error;
        }

        gfx_text_fmt_init(&fmt);
        fmt.font = font;
        fmt.color = color;

        pos.x = rect.p0.x;
        pos.y = rect.p0.y;
        rc = gfx_puttext(&pos, &fmt, "Top left");
        if (rc != EOK) {
                printf("Error rendering text.\n");
                goto error;
        }

        pos.x = (rect.p0.x + rect.p1.x - 1) / 2;
        pos.y = rect.p0.y;
        fmt.halign = gfx_halign_center;
        rc = gfx_puttext(&pos, &fmt, "Top center");
        if (rc != EOK)
                goto error;

        pos.x = rect.p1.x;
        pos.y = rect.p0.y;
        fmt.halign = gfx_halign_right;
        rc = gfx_puttext(&pos, &fmt, "Top right");
        if (rc != EOK)
                goto error;

        fmt.valign = gfx_valign_center;

        pos.x = rect.p0.x;
        pos.y = (rect.p0.y + rect.p1.y - 1) / 2;
        fmt.halign = gfx_halign_left;
        rc = gfx_puttext(&pos, &fmt, "Center left");
        if (rc != EOK)
                goto error;

        pos.x = (rect.p0.x + rect.p1.x - 1) / 2;
        pos.y = (rect.p0.y + rect.p1.y - 1) / 2;
        fmt.halign = gfx_halign_center;
        rc = gfx_puttext(&pos, &fmt, "Center");
        if (rc != EOK)
                goto error;

        pos.x = rect.p1.x;
        pos.y = (rect.p0.y + rect.p1.y - 1) / 2;
        fmt.halign = gfx_halign_right;
        rc = gfx_puttext(&pos, &fmt, "Center right");
        if (rc != EOK)
                goto error;

        fmt.valign = gfx_valign_bottom;

        pos.x = rect.p0.x;
        pos.y = rect.p1.y - 1;
        fmt.halign = gfx_halign_left;
        rc = gfx_puttext(&pos, &fmt, "Bottom left");
        if (rc != EOK)
                goto error;

        pos.x = (rect.p0.x + rect.p1.x - 1) / 2;
        pos.y = rect.p1.y;
        fmt.halign = gfx_halign_center;
        rc = gfx_puttext(&pos, &fmt, "Bottom center");
        if (rc != EOK)
                goto error;

        pos.x = rect.p1.x;
        pos.y = rect.p1.y;
        fmt.halign = gfx_halign_right;
        rc = gfx_puttext(&pos, &fmt, "Bottom right");
        if (rc != EOK)
                goto error;

        gfx_color_delete(color);

        gfx_text_fmt_init(&fmt);
        fmt.font = font;

        for (i = 0; i < 8; i++) {
                if (demo_is_text()) {
                        rc = gfx_color_new_ega(i != 0 ? i : 0x10, &color);
                        if (rc != EOK)
                                goto error;
                } else {
                        rc = gfx_color_new_rgb_i16((i & 4) ? 0xffff : 0,
                            (i & 2) ? 0xffff : 0, (i & 1) ? 0xffff : 0, &color);
                        if (rc != EOK)
                                goto error;
                }

                fmt.color = color;
                fmt.underline = !fmt.underline;

                pos.x = w / 20;
                pos.y = (6 + i) * h / 15;
                rc = gfx_puttext(&pos, &fmt, "The quick brown fox jumps over the lazy dog.");
                if (rc != EOK)
                        goto error;

                gfx_color_delete(color);
        }

        for (i = 0; i < 10; i++) {
                demo_msleep(500);
                if (quit)
                        break;
        }

        return EOK;
error:
        return rc;
}

/** Run text abbreviation demo on a graphic context.
 *
 * @param gc Graphic context
 * @param w Width
 * @param h Height
 */
static errno_t demo_text_abbr(gfx_context_t *gc, gfx_coord_t w, gfx_coord_t h)
{
        gfx_color_t *color = NULL;
        gfx_rect_t rect;
        gfx_coord2_t pos;
        gfx_text_fmt_t fmt;
        int i;
        errno_t rc;

        if (quit)
                return EOK;

        rc = demo_begin(gc, w, h, "Text abbreviation");
        if (rc != EOK)
                goto error;

        for (i = 0; i < 11; i++) {

                rc = gfx_color_new_rgb_i16(0, 0, 0x8000, &color);
                if (rc != EOK)
                        goto error;

                rc = gfx_set_color(gc, color);
                if (rc != EOK)
                        goto error;

                rect.p0.x = w / 20;
                rect.p0.y = (2 + 2 * i) * h / 25;
                rect.p1.x = w - w / 20 - w * i / 12;
                rect.p1.y = (3 + 2 * i) * h / 25;

                rc = gfx_fill_rect(gc, &rect);
                if (rc != EOK)
                        goto error;

                gfx_color_delete(color);

                if (demo_is_text()) {
                        rc = gfx_color_new_ega(0x1f, &color);
                        if (rc != EOK)
                                goto error;
                } else {
                        rc = gfx_color_new_rgb_i16(0xffff, 0xffff, 0xffff,
                            &color);
                        if (rc != EOK)
                                goto error;
                }

                gfx_text_fmt_init(&fmt);
                fmt.font = font;
                fmt.color = color;
                fmt.abbreviate = true;
                fmt.width = rect.p1.x - rect.p0.x;

                pos.x = rect.p0.x;
                pos.y = rect.p0.y;
                rc = gfx_puttext(&pos, &fmt,
                    "The quick brow fox jumps over the lazy dog!");
                if (rc != EOK) {
                        printf("Error rendering text.\n");
                        goto error;
                }
        }

        for (i = 0; i < 10; i++) {
                demo_msleep(500);
                if (quit)
                        break;
        }

        return EOK;
error:
        return rc;
}

/** Run clipping demo on a graphic context.
 *
 * @param gc Graphic context
 * @param w Width
 * @param h Height
 */
static errno_t demo_clip(gfx_context_t *gc, gfx_coord_t w, gfx_coord_t h)
{
        gfx_bitmap_t *bitmap;
        gfx_color_t *color;
        gfx_bitmap_params_t params;
        int i, j;
        gfx_coord2_t offs;
        gfx_rect_t rect;
        errno_t rc;

        if (quit)
                return EOK;

        rc = demo_begin(gc, w, h, "Clipping demonstration");
        if (rc != EOK)
                return rc;

        gfx_bitmap_params_init(&params);
        params.rect.p0.x = 0;
        params.rect.p0.y = 0;
        params.rect.p1.x = 40;
        params.rect.p1.y = 20;

        rc = gfx_bitmap_create(gc, &params, NULL, &bitmap);
        if (rc != EOK)
                return rc;

        rc = bitmap_moire(bitmap, 40, 20);
        if (rc != EOK)
                goto error;

        for (j = 0; j < 10; j++) {
                rect.p0.x = w / 8;
                rect.p0.y = h / 8;
                rect.p1.x = w * 7 / 8;
                rect.p1.y = h * 3 / 8;

                rc = gfx_set_clip_rect(gc, &rect);
                if (rc != EOK)
                        return rc;

                rc = gfx_color_new_rgb_i16(rand() % 0x10000, rand() % 0x10000,
                    rand() % 0x10000, &color);
                if (rc != EOK)
                        return rc;

                rc = gfx_set_color(gc, color);
                if (rc != EOK)
                        return rc;

                for (i = 0; i < 10; i++) {
                        rect.p0.x = rand() % (w - 1);
                        rect.p0.y = rand() % (h - 1);
                        rect.p1.x = rect.p0.x + rand() % (w - 1 - rect.p0.x);
                        rect.p1.y = rect.p0.y + rand() % (h - 1 - rect.p0.y);

                        rc = gfx_fill_rect(gc, &rect);
                        if (rc != EOK)
                                return rc;
                }

                gfx_color_delete(color);

                rect.p0.x = w / 8;
                rect.p0.y = h * 5 / 8;
                rect.p1.x = w * 7 / 8;
                rect.p1.y = h * 7 / 8;

                rc = gfx_set_clip_rect(gc, &rect);
                if (rc != EOK)
                        return rc;

                for (i = 0; i < 10; i++) {
                        offs.x = rand() % (w - 40);
                        offs.y = rand() % (h - 20);

                        rc = gfx_bitmap_render(bitmap, NULL, &offs);
                        if (rc != EOK)
                                goto error;
                }

                demo_msleep(500);
                if (quit)
                        break;
        }

        (void) gfx_set_clip_rect(gc, NULL);
        gfx_bitmap_destroy(bitmap);
        return EOK;
error:
        (void) gfx_set_clip_rect(gc, NULL);
        gfx_bitmap_destroy(bitmap);
        return rc;
}

/** Run demo loop on a graphic context.
 *
 * @param gc Graphic context
 * @param w Width
 * @param h Height
 */
static errno_t demo_loop(gfx_context_t *gc, gfx_coord_t w, gfx_coord_t h)
{
        errno_t rc;

        (void) demo_font_init(gc, w, h);

        while (!quit) {
                rc = demo_rects(gc, w, h);
                if (rc != EOK)
                        goto error;

                rc = demo_bitmap(gc, w, h);
                if (rc != EOK)
                        goto error;

                rc = demo_bitmap2(gc, w, h);
                if (rc != EOK)
                        goto error;

                rc = demo_bitmap_kc(gc, w, h);
                if (rc != EOK)
                        goto error;

                rc = demo_text(gc, w, h);
                if (rc != EOK)
                        goto error;

                rc = demo_text_abbr(gc, w, h);
                if (rc != EOK)
                        goto error;

                rc = demo_clip(gc, w, h);
                if (rc != EOK)
                        goto error;
        }

        demo_font_fini();
        return EOK;
error:
        demo_font_fini();
        return rc;
}

/** Run demo on console. */
static errno_t demo_console(void)
{
        console_gc_t *cgc = NULL;
        gfx_context_t *gc;
        sysarg_t cols, rows;
        errno_t rc;

        con = console_init(stdin, stdout);
        if (con == NULL)
                return EIO;

        rc = console_get_size(con, &cols, &rows);
        if (rc != EOK)
                return rc;

        rc = console_gc_create(con, stdout, &cgc);
        if (rc != EOK)
                return rc;

        gc = console_gc_get_ctx(cgc);

        /* Currently console is always text. */
        textmode = true;

        rc = demo_loop(gc, cols, rows);
        if (rc != EOK)
                return rc;

        rc = console_gc_delete(cgc);
        if (rc != EOK)
                return rc;

        return EOK;
}

static errno_t demo_ui_fibril(void *arg)
{
        demo_ui_args_t *args = (demo_ui_args_t *)arg;
        errno_t rc;

        ui_lock(args->ui);
        rc = demo_loop(args->gc, args->dims.x, args->dims.y);
        ui_unlock(args->ui);
        ui_quit(args->ui);
        return rc;
}

/** Run demo on UI. */
static errno_t demo_ui(const char *display_spec)
{
        ui_wnd_params_t params;
        ui_window_t *window = NULL;
        gfx_context_t *gc;
        gfx_rect_t rect;
        gfx_rect_t wrect;
        gfx_coord2_t off;
        gfx_rect_t ui_rect;
        gfx_coord2_t dims;
        demo_ui_args_t args;
        fid_t fid;
        errno_t rc;

        rc = ui_create(display_spec, &ui);
        if (rc != EOK) {
                printf("Error initializing UI (%s)\n", display_spec);
                goto error;
        }

        rc = ui_get_rect(ui, &ui_rect);
        if (rc != EOK) {
                printf("Error getting display size.\n");
                goto error;
        }

        rect.p0.x = 0;
        rect.p0.y = 0;
        rect.p1.x = 400;
        rect.p1.y = 300;

        ui_wnd_params_init(&params);
        params.caption = "GFX Demo";

        /* Do not decorate the window in fullscreen mode */
        if (ui_is_fullscreen(ui))
                params.style &= ~ui_wds_decorated;

        /*
         * Compute window rectangle such that application area corresponds
         * to rect
         */
        ui_wdecor_rect_from_app(ui, params.style, &rect, &wrect);
        off = wrect.p0;
        gfx_rect_rtranslate(&off, &wrect, &params.rect);

        gfx_rect_dims(&ui_rect, &dims);

        /* Make sure window is not larger than the entire screen */
        if (params.rect.p1.x > dims.x)
                params.rect.p1.x = dims.x;
        if (params.rect.p1.y > dims.y)
                params.rect.p1.y = dims.y;

        rc = ui_window_create(ui, &params, &window);
        if (rc != EOK) {
                printf("Error creating window.\n");
                goto error;
        }

        ui_window_set_cb(window, &ui_window_cb, NULL);

        rc = ui_window_get_app_gc(window, &gc);
        if (rc != EOK) {
                printf("Error creating graphic context.\n");
                goto error;
        }

        ui_window_get_app_rect(window, &rect);
        gfx_rect_dims(&rect, &dims);

        if (!ui_is_fullscreen(ui))
                task_retval(0);

        textmode = ui_is_textmode(ui);

        args.gc = gc;
        args.dims = dims;
        args.ui = ui;

        fid = fibril_create(demo_ui_fibril, (void *)&args);
        if (fid == 0) {
                rc = ENOMEM;
                goto error;
        }

        fibril_add_ready(fid);

        ui_run(ui);
        ui_window_destroy(window);
        ui_destroy(ui);

        return EOK;
error:
        if (window != NULL)
                ui_window_destroy(window);
        if (ui != NULL)
                ui_destroy(ui);
        return rc;
}

/** Run demo on display server. */
static errno_t demo_display(const char *display_svc)
{
        display_t *display = NULL;
        gfx_context_t *gc;
        display_wnd_params_t params;
        display_window_t *window = NULL;
        errno_t rc;

        rc = display_open(display_svc, &display);
        if (rc != EOK) {
                printf("Error opening display.\n");
                return rc;
        }

        display_wnd_params_init(&params);
        params.rect.p0.x = 0;
        params.rect.p0.y = 0;
        params.rect.p1.x = 400;
        params.rect.p1.y = 300;
        params.caption = "GFX Demo";

        rc = display_window_create(display, &params, &wnd_cb, NULL, &window);
        if (rc != EOK) {
                printf("Error creating window.\n");
                return rc;
        }

        rc = display_window_get_gc(window, &gc);
        if (rc != EOK) {
                printf("Error getting graphics context.\n");
                return rc;
        }

        task_retval(0);

        /* FIXME Assuming display service is not text mode. */
        textmode = false;

        rc = demo_loop(gc, 400, 300);
        if (rc != EOK)
                return rc;

        rc = gfx_context_delete(gc);
        if (rc != EOK)
                return rc;

        display_window_destroy(window);
        display_close(display);

        return EOK;
}

static void demo_quit(void)
{
        fibril_mutex_lock(&quit_lock);
        quit = true;
        fibril_mutex_unlock(&quit_lock);
        fibril_condvar_broadcast(&quit_cv);
}

static void wnd_close_event(void *arg)
{
        demo_quit();
}

static void demo_kbd_event(kbd_event_t *event)
{
        if (event->type == KEY_PRESS) {
                /* Ctrl-Q */
                if ((event->mods & KM_CTRL) != 0 &&
                    (event->mods & KM_ALT) == 0 &&
                    (event->mods & KM_SHIFT) == 0 &&
                    event->key == KC_Q) {
                        demo_quit();
                }

                /* Escape */
                if ((event->mods & KM_CTRL) == 0 &&
                    (event->mods & KM_ALT) == 0 &&
                    (event->mods & KM_SHIFT) == 0 &&
                    event->key == KC_ESCAPE) {
                        demo_quit();
                }
        }
}

static void wnd_kbd_event(void *arg, kbd_event_t *event)
{
        (void)arg;
        demo_kbd_event(event);
}

static void uiwnd_close_event(ui_window_t *window, void *arg)
{
        demo_quit();
}

static void uiwnd_kbd_event(ui_window_t *window, void *arg, kbd_event_t *event)
{
        (void)window;
        (void)arg;
        demo_kbd_event(event);
}

static void print_syntax(void)
{
        printf("Syntax: gfxdemo [-d <display>] {console|display|ui}\n");
}

int main(int argc, char *argv[])
{
        errno_t rc;
        const char *display_svc = DISPLAY_DEFAULT;
        const char *ui_display_spec = UI_ANY_DEFAULT;
        int i;

        i = 1;
        while (i < argc && argv[i][0] == '-') {
                if (str_cmp(argv[i], "-d") == 0) {
                        ++i;
                        if (i >= argc) {
                                printf("Argument missing.\n");
                                print_syntax();
                                return 1;
                        }

                        display_svc = ui_display_spec = argv[i++];
                } else {
                        printf("Invalid option '%s'.\n", argv[i]);
                        print_syntax();
                        return 1;
                }
        }

        if (i >= argc || str_cmp(argv[i], "ui") == 0) {
                rc = demo_ui(ui_display_spec);
                if (rc != EOK)
                        return 1;
        } else if (str_cmp(argv[i], "console") == 0) {
                rc = demo_console();
                if (rc != EOK)
                        return 1;
        } else if (str_cmp(argv[i], "display") == 0) {
                rc = demo_display(display_svc);
                if (rc != EOK)
                        return 1;
        } else {
                print_syntax();
                return 1;
        }
}

/** @}
 */
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root/uspace/app/gfxdemo/gfxdemo.c

DEFINITIONS
