main.c

/**
 * @file main
 *
 */

/*********************
 *      INCLUDES
 *********************/

#define _DEFAULT_SOURCE /* needed for usleep() */
#include <stdlib.h>
#include <unistd.h>
#define SDL_MAIN_HANDLED        /*To fix SDL's "undefined reference to WinMain" issue*/
#ifdef __WIN32__
    #include <SDL2_win32/SDL.h>
#elif __linux__
    #include <SDL2/SDL.h>
#else
    #include <SDL.h>
#endif
#include "lvgl/lvgl.h"
#include "lv_drivers/display/monitor.h"
#include "lv_drivers/indev/mouse.h"
#include "lv_drivers/indev/mousewheel.h"
#include "lv_drivers/indev/keyboard.h"
#include "lv_examples/lv_apps/demo/demo.h"
#include "lv_examples/lv_apps/benchmark/benchmark.h"
#include "lv_examples/lv_examples.h"


/*********************
 *      DEFINES
 *********************/

/*On OSX SDL needs different handling*/
#if defined(__APPLE__) && defined(TARGET_OS_MAC)
# if __APPLE__ && TARGET_OS_MAC
#define SDL_APPLE
# endif
#endif

/**********************
 *      TYPEDEFS
 **********************/

/**********************
 *  STATIC PROTOTYPES
 **********************/
static void hal_init(void);
static int tick_thread(void * data);
static void memory_monitor(lv_task_t * param);

/**********************
 *  STATIC VARIABLES
 **********************/

/**********************
 *      MACROS
 **********************/

/**********************
 *   GLOBAL FUNCTIONS
 **********************/

int main(int argc, char ** argv)
{
    (void) argc;    /*Unused*/
    (void) argv;    /*Unused*/

    /*Initialize LittlevGL*/
    lv_init();

    /*Initialize the HAL (display, input devices, tick) for LittlevGL*/
    hal_init();

    /*Create a demo*/
    demo_create();

    /*Try the benchmark to see how fast your GUI is*/
    //    benchmark_create();

    /*Check the themes too*/
    //    lv_test_theme_1(lv_theme_night_init(15, NULL));

    //    lv_test_theme_2();
    /*Try the touchpad-less navigation (use the Tab and Arrow keys or the Mousewheel)*/
    //    lv_test_group_1();


    while(1) {
        /* Periodically call the lv_task handler.
         * It could be done in a timer interrupt or an OS task too.*/
        lv_task_handler();
        usleep(5 * 1000);

#ifdef SDL_APPLE
        SDL_Event event;

        while(SDL_PollEvent(&event)) {
#if USE_MOUSE != 0
            mouse_handler(&event);
#endif

#if USE_KEYBOARD
            keyboard_handler(&event);
#endif

#if USE_MOUSEWHEEL != 0
            mousewheel_handler(&event);
#endif
        }
#endif
    }

    return 0;
}

/**********************
 *   STATIC FUNCTIONS
 **********************/

/**
 * Initialize the Hardware Abstraction Layer (HAL) for the Littlev graphics library
 */
static void hal_init(void)
{
    /* Use the 'monitor' driver which creates window on PC's monitor to simulate a display*/
    monitor_init();

    /*Create a display buffer*/
    static lv_disp_buf_t disp_buf1;
    static lv_color_t buf1_1[480*10];
    lv_disp_buf_init(&disp_buf1, buf1_1, NULL, 480*10);

    /*Create a display*/
    lv_disp_drv_t disp_drv;
    lv_disp_drv_init(&disp_drv);            /*Basic initialization*/
    disp_drv.buffer = &disp_buf1;
    disp_drv.flush_cb = monitor_flush;    /*Used when `LV_VDB_SIZE != 0` in lv_conf.h (buffered drawing)*/
    lv_disp_drv_register(&disp_drv);

    /* Add the mouse as input device
     * Use the 'mouse' driver which reads the PC's mouse*/
    mouse_init();
    lv_indev_drv_t indev_drv;
    lv_indev_drv_init(&indev_drv);          /*Basic initialization*/
    indev_drv.type = LV_INDEV_TYPE_POINTER;
    indev_drv.read_cb = mouse_read;         /*This function will be called periodically (by the library) to get the mouse position and state*/
    lv_indev_t * mouse_indev = lv_indev_drv_register(&indev_drv);

    /*Set a cursor for the mouse*/
    LV_IMG_DECLARE(mouse_cursor_icon);                          /*Declare the image file.*/
    lv_obj_t * cursor_obj =  lv_img_create(lv_disp_get_scr_act(NULL), NULL); /*Create an image object for the cursor */
    lv_img_set_src(cursor_obj, &mouse_cursor_icon);             /*Set the image source*/
    lv_indev_set_cursor(mouse_indev, cursor_obj);               /*Connect the image  object to the driver*/

    /* Tick init.
     * You have to call 'lv_tick_inc()' in periodically to inform LittelvGL about how much time were elapsed
     * Create an SDL thread to do this*/
    SDL_CreateThread(tick_thread, "tick", NULL);

    /* Optional:
     * Create a memory monitor task which prints the memory usage in periodically.*/
    lv_task_create(memory_monitor, 3000, LV_TASK_PRIO_MID, NULL);
}

/**
 * A task to measure the elapsed time for LittlevGL
 * @param data unused
 * @return never return
 */
static int tick_thread(void * data)
{
    (void)data;

    while(1) {
        SDL_Delay(5);   /*Sleep for 5 millisecond*/
        lv_tick_inc(5); /*Tell LittelvGL that 5 milliseconds were elapsed*/
    }

    return 0;
}

/**
 * Print the memory usage periodically
 * @param param
 */
static void memory_monitor(lv_task_t * param)
{
    (void) param; /*Unused*/

    lv_mem_monitor_t mon;
    lv_mem_monitor(&mon);
    printf("used: %6d (%3d %%), frag: %3d %%, biggest free: %6d\n", (int)mon.total_size - mon.free_size,
            mon.used_pct,
            mon.frag_pct,
            (int)mon.free_biggest_size);

}