source: mainline/uspace/app/barber/barber.c@ 3061bc1

/*
 * Copyright (c) 2014 Martin Decky
 * 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 barber
 * @{
 */
/** @file
 */

#include <stdbool.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <task.h>
#include <loc.h>
#include <stats.h>
#include <fibril_synch.h>
#include <io/pixel.h>
#include <device/led_dev.h>
#include <window.h>
#include <canvas.h>
#include <surface.h>
#include <codec/tga.gz.h>
#include "images.h"

#define NAME  "barber"

#define FRAMES  IMAGES

#define MIN_FPS  1
#define MAX_FPS  25

#define MIN_LOAD  (LOAD_UNIT / 4)
#define MAX_LOAD  (LOAD_UNIT / 3)

#define FRAME_WIDTH   59
#define FRAME_HEIGHT  192

#define LED_PERIOD  1000000
#define LED_COLORS  7

typedef struct {
        link_t link;
        service_id_t svc_id;
        async_sess_t *sess;
} led_dev_t;

static char *winreg = NULL;

static fibril_timer_t *led_timer = NULL;
static list_t led_devs;
static unsigned int led_color = 0;

static pixel_t led_colors[LED_COLORS] = {
        PIXEL(0xff, 0xff, 0x00, 0x00),
        PIXEL(0xff, 0x00, 0xff, 0x00),
        PIXEL(0xff, 0x00, 0x00, 0xff),
        PIXEL(0xff, 0xff, 0xff, 0x00),
        PIXEL(0xff, 0xff, 0x00, 0xff),
        PIXEL(0xff, 0x00, 0xff, 0xff),
        PIXEL(0xff, 0xff, 0xff, 0xff)
};

static fibril_timer_t *frame_timer = NULL;
static canvas_t *frame_canvas;
static surface_t *frames[FRAMES];

static unsigned int frame = 0;
static unsigned int fps = MIN_FPS;

static void led_timer_callback(void *);
static void frame_timer_callback(void *);

static bool decode_frames(void)
{
        for (unsigned int i = 0; i < FRAMES; i++) {
                frames[i] = decode_tga_gz(images[i].addr, images[i].size, 0);
                if (frames[i] == NULL) {
                        printf("Unable to decode frame %u.\n", i);
                        return false;
                }
        }
        
        return true;
}

static void plan_led_timer(void)
{
        fibril_timer_set(led_timer, LED_PERIOD, led_timer_callback, NULL);
}

static load_t get_load(void)
{
        size_t count;
        load_t *load = stats_get_load(&count);
        load_t load_val;
        
        if ((load != NULL) && (count > 0)) {
                load_val = load[0];
                free(load);
        } else
                load_val = 0;
        
        return load_val;
}

static void plan_frame_timer(suseconds_t render_time)
{
        /*
         * Crank up the FPS unless we lack
         * behind with the rendering and
         * unless the load is not above
         * a lower threshold.
         */
        
        suseconds_t delta = 1000000 / fps;
        load_t load = get_load();
        
        if ((delta >= render_time) && (load < MIN_LOAD))
                fps++;
        
        if (fps > MAX_FPS)
                fps = MAX_FPS;
        
        /*
         * If we lack behind then immediately
         * go to the lowest FPS.
         */
        
        if (delta < render_time)
                fps = MIN_FPS;
        
        /*
         * Crank down the FPS if the current
         * load is above an upper threshold.
         */
        
        if (load > MAX_LOAD)
                fps--;
        
        if (fps < MIN_FPS)
                fps = MIN_FPS;
        
        delta = 1000000 / fps;
        
        fibril_timer_set(frame_timer, delta, frame_timer_callback, NULL);
}

static void led_timer_callback(void *data)
{
        pixel_t next_led_color = led_colors[led_color];
        
        led_color++;
        if (led_color >= LED_COLORS)
                led_color = 0;
        
        list_foreach(led_devs, link, led_dev_t, dev) {
                if (dev->sess)
                        led_dev_color_set(dev->sess, next_led_color);
        }
        
        plan_led_timer();
}

static void frame_timer_callback(void *data)
{
        struct timeval prev;
        getuptime(&prev);
        
        frame++;
        if (frame >= FRAMES)
                frame = 0;
        
        update_canvas(frame_canvas, frames[frame]);
        
        struct timeval cur;
        getuptime(&cur);
        
        plan_frame_timer(tv_sub_diff(&cur, &prev));
}

static void loc_callback(void)
{
        category_id_t led_cat;
        errno_t rc = loc_category_get_id("led", &led_cat, IPC_FLAG_BLOCKING);
        if (rc != EOK)
                return;
        
        service_id_t *svcs;
        size_t count;
        rc = loc_category_get_svcs(led_cat, &svcs, &count);
        if (rc != EOK)
                return;
        
        for (size_t i = 0; i < count; i++) {
                bool known = false;
                
                /* Determine whether we already know this device. */
                list_foreach(led_devs, link, led_dev_t, dev) {
                        if (dev->svc_id == svcs[i]) {
                                known = true;
                                break;
                        }
                }
                
                if (!known) {
                        led_dev_t *dev = (led_dev_t *) calloc(1, sizeof(led_dev_t));
                        if (!dev)
                                continue;
                        
                        link_initialize(&dev->link);
                        dev->svc_id = svcs[i];
                        dev->sess = loc_service_connect(svcs[i], INTERFACE_DDF, 0);
                        
                        list_append(&dev->link, &led_devs);
                }
        }
        
        // FIXME: Handle LED device removal
        
        free(svcs);
}

int main(int argc, char *argv[])
{
        if (argc < 2) {
                printf("Compositor server not specified.\n");
                return 1;
        }
        
        list_initialize(&led_devs);
        errno_t rc = loc_register_cat_change_cb(loc_callback);
        if (rc != EOK) {
                printf("Unable to register callback for device discovery.\n");
                return 1;
        }
        
        led_timer = fibril_timer_create(NULL);
        if (!led_timer) {
                printf("Unable to create LED timer.\n");
                return 1;
        }
        
        frame_timer = fibril_timer_create(NULL);
        if (!frame_timer) {
                printf("Unable to create frame timer.\n");
                return 1;
        }
        
        if (!decode_frames())
                return 1;
        
        winreg = argv[1];
        window_t *main_window = window_open(argv[1], NULL,
            WINDOW_MAIN | WINDOW_DECORATED, "barber");
        if (!main_window) {
                printf("Cannot open main window.\n");
                return 1;
        }
        
        frame_canvas = create_canvas(window_root(main_window), NULL,
            FRAME_WIDTH, FRAME_HEIGHT, frames[frame]);
        
        if (!frame_canvas) {
                window_close(main_window);
                printf("Cannot create widgets.\n");
                return 1;
        }
        
        window_resize(main_window, 0, 0, FRAME_WIDTH + 8, FRAME_HEIGHT + 28,
            WINDOW_PLACEMENT_RIGHT | WINDOW_PLACEMENT_BOTTOM);
        window_exec(main_window);
        
        plan_led_timer();
        plan_frame_timer(0);
        
        task_retval(0);
        async_manager();
        
        return 0;
}

/** @}
 */