display_utils.c

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/**
 * \file display_utils.c
 * \brief Display update wrapper functions
 */

/*
 * This file is part of liberutils.
 *
 * liberutils is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 *
 * liberutils is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

/**
 * Copyright (C) 2009 iRex Technologies B.V.
 * All rights reserved.
 */

//----------------------------------------------------------------------------
// Include Files
//----------------------------------------------------------------------------

// system include files, between < >
#include <glib.h>
#include <stdio.h>
#include <unistd.h>
#include <arpa/inet.h>

// ereader library include files, between < >
#include "er_error.h"

// local include files, between " "
#include "log.h"
#include "display_utils.h"


//----------------------------------------------------------------------------
// Type Declarations
//----------------------------------------------------------------------------


//----------------------------------------------------------------------------
// Constants
//----------------------------------------------------------------------------

#define DMPORT                  50555
#define DMSERVER                "127.0.0.1"


//----------------------------------------------------------------------------
// Static Variables
//----------------------------------------------------------------------------

static int                dm_socket = -1;
static struct sockaddr_in dm_addr;


//============================================================================
// Local Function Definitions
//============================================================================

static void init_socket  (void);
static void send_message (int take_control, int waveform);


//============================================================================
// Functions Implementation
//============================================================================

void display_init()
{
    if (dm_socket == -1)
    {
        init_socket();
    }
}


void display_finialize()
{
    if (dm_socket != -1)
    {
        close(dm_socket);
    }
}

void display_gain_control()
{
    send_message(TRUE, DM_HINT_NONE);
}


void display_return_control()
{
    send_message(FALSE, DM_HINT_NONE);
}


void display_update_return_control(int type)
{
    send_message(FALSE, type);
}


void display_update_keep_control(int type)
{
    send_message(TRUE, type);
}


void display_splash_lock()
{
    send_message(TRUE, DM_HINT_LOCK);
}


void display_update_keep_splash_lock()
{
    send_message(TRUE, DM_HINT_SPLASH);
}


void display_splash_unlock()
{
    send_message(TRUE, DM_HINT_UNLOCK);
}


//============================================================================
// Local Function Implementation
//============================================================================

static void init_socket()
{
    // create and bind socket
    dm_socket = socket(PF_INET, SOCK_DGRAM, 0);
    dm_addr.sin_family = AF_INET;
    dm_addr.sin_port = htons(DMPORT);
    dm_addr.sin_addr.s_addr = inet_addr(DMSERVER);
    memset(dm_addr.sin_zero, '\0', sizeof(dm_addr.sin_zero));
}


static void send_message(int take_control, int waveform)
{
    char msg[256];
    
    if (dm_socket == -1)
    {
        init_socket();
    }
    
    // send display update message
    snprintf(msg, sizeof(msg)-1, "!F,%d,%d,%d\n", getpid(), take_control > 0 ? 1 : 0, waveform);
    sendto(dm_socket, msg, strlen(msg), 0, (struct sockaddr*) &dm_addr, sizeof(dm_addr));

    LOGPRINTF("Sent: %s", msg);
}