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lvgl_cpp/lv_drivers/gtkdrv/gtkdrv.c

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/**
* @file gtk.c
*
*/
/*********************
* INCLUDES
*********************/
#include "gtkdrv.h"
#if USE_GTK
#define _DEFAULT_SOURCE /* needed for usleep() */
#include <stdlib.h>
#include <unistd.h>
#include <gtk/gtk.h>
#include <gtk/gtkx.h>
#include <pthread.h>
#include <time.h>
#include <sys/time.h>
/*********************
* DEFINES
*********************/
/**********************
* TYPEDEFS
**********************/
/**********************
* STATIC PROTOTYPES
**********************/
static void gtkdrv_handler(void * p);
static gboolean mouse_pressed(GtkWidget *widget, GdkEventButton *event,
gpointer user_data);
static gboolean mouse_released(GtkWidget *widget, GdkEventButton *event,
gpointer user_data);
static gboolean mouse_motion(GtkWidget *widget, GdkEventMotion *event,
gpointer user_data);
static gboolean keyboard_press(GtkWidget *widget, GdkEventKey *event,
gpointer user_data);
static gboolean keyboard_release(GtkWidget *widget, GdkEventKey *event,
gpointer user_data);
static void quit_handler(void);
/**********************
* STATIC VARIABLES
**********************/
static GtkWidget *window;
static GtkWidget *event_box;
static GtkWidget *output_image;
static GdkPixbuf *pixbuf;
static unsigned char run_gtk;
static lv_coord_t mouse_x;
static lv_coord_t mouse_y;
static lv_indev_state_t mouse_btn = LV_INDEV_STATE_REL;
static lv_key_t last_key;
static lv_indev_state_t last_key_state;
static uint8_t fb[LV_HOR_RES_MAX * LV_VER_RES_MAX * 3];
/**********************
* MACROS
**********************/
/**********************
* GLOBAL FUNCTIONS
**********************/
void gtkdrv_init(void)
{
// Init GTK
gtk_init(NULL, NULL);
/* Or just set up the widgets in code */
window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_default_size(GTK_WINDOW(window), LV_HOR_RES_MAX, LV_VER_RES_MAX);
gtk_window_set_resizable (GTK_WINDOW(window), FALSE);
output_image = gtk_image_new();
event_box = gtk_event_box_new (); // Use event_box around image, otherwise mouse position output in broadway is offset
gtk_container_add(GTK_CONTAINER (event_box), output_image);
gtk_container_add(GTK_CONTAINER (window), event_box);
gtk_widget_add_events(event_box, GDK_BUTTON_PRESS_MASK);
gtk_widget_add_events(event_box, GDK_SCROLL_MASK);
gtk_widget_add_events(event_box, GDK_POINTER_MOTION_MASK);
gtk_widget_add_events(window, GDK_KEY_PRESS_MASK);
g_signal_connect(window, "destroy", G_CALLBACK(quit_handler), NULL);
g_signal_connect(event_box, "button-press-event", G_CALLBACK(mouse_pressed), NULL);
g_signal_connect(event_box, "button-release-event", G_CALLBACK(mouse_released), NULL);
g_signal_connect(event_box, "motion-notify-event", G_CALLBACK(mouse_motion), NULL);
g_signal_connect(window, "key_press_event", G_CALLBACK(keyboard_press), NULL);
g_signal_connect(window, "key_release_event", G_CALLBACK(keyboard_release), NULL);
gtk_widget_show_all(window);
pixbuf = gdk_pixbuf_new_from_data((guchar*)fb, GDK_COLORSPACE_RGB, false, 8, LV_HOR_RES_MAX, LV_VER_RES_MAX, LV_HOR_RES_MAX * 3, NULL, NULL);
if (pixbuf == NULL)
{
fprintf(stderr, "Creating pixbuf failed\n");
return;
}
pthread_t thread;
pthread_create(&thread, NULL, gtkdrv_handler, NULL);
}
/*Set in lv_conf.h as `LV_TICK_CUSTOM_SYS_TIME_EXPR`*/
uint32_t gtkdrv_tick_get(void)
{
static uint64_t start_ms = 0;
if(start_ms == 0) {
struct timeval tv_start;
gettimeofday(&tv_start, NULL);
start_ms = (tv_start.tv_sec * 1000000 + tv_start.tv_usec) / 1000;
}
struct timeval tv_now;
gettimeofday(&tv_now, NULL);
uint64_t now_ms;
now_ms = (tv_now.tv_sec * 1000000 + tv_now.tv_usec) / 1000;
uint32_t time_ms = now_ms - start_ms;
return time_ms;
}
/**
* Flush a buffer to the marked area
* @param disp_drv pointer to driver where this function belongs
* @param area an area where to copy `color_p`
* @param color_p an array of pixels to copy to the `area` part of the screen
*/
void gtkdrv_flush_cb(lv_disp_drv_t * disp_drv, const lv_area_t * area, lv_color_t * color_p)
{
lv_coord_t hres = disp_drv->rotated == 0 ? disp_drv->hor_res : disp_drv->ver_res;
lv_coord_t vres = disp_drv->rotated == 0 ? disp_drv->ver_res : disp_drv->hor_res;
/*Return if the area is out the screen*/
if(area->x2 < 0 || area->y2 < 0 || area->x1 > hres - 1 || area->y1 > vres - 1) {
lv_disp_flush_ready(disp_drv);
return;
}
int32_t y;
int32_t x;
int32_t p;
for(y = area->y1; y <= area->y2 && y < disp_drv->ver_res; y++) {
p = (y * disp_drv->hor_res + area->x1) * 3;
for(x = area->x1; x <= area->x2 && x < disp_drv->hor_res; x++) {
fb[p] = color_p->ch.red;
fb[p + 1] = color_p->ch.green;
fb[p + 2] = color_p->ch.blue;
p += 3;
color_p ++;
}
}
/*IMPORTANT! It must be called to tell the system the flush is ready*/
lv_disp_flush_ready(disp_drv);
}
void gtkdrv_mouse_read_cb(lv_indev_drv_t * drv, lv_indev_data_t * data)
{
data->point.x = mouse_x;
data->point.y = mouse_y;
data->state = mouse_btn;
}
void gtkdrv_keyboard_read_cb(lv_indev_drv_t * drv, lv_indev_data_t * data)
{
data->key = last_key;
data->state = last_key_state;
}
/**********************
* STATIC FUNCTIONS
**********************/
static void gtkdrv_handler(void * p)
{
while(1) {
gtk_image_set_from_pixbuf(GTK_IMAGE(output_image), pixbuf); // Test code
/* Real code should: call gdk_pixbuf_new_from_data () with pointer to frame buffer
generated by LVGL. See
https://developer.gnome.org/gdk-pixbuf/2.36/gdk-pixbuf-Image-Data-in-Memory.html
*/
gtk_main_iteration_do(FALSE);
/* Explicitly calling each iteration of the GTK main loop allows LVGL to sync frame
buffer updates with GTK. It is perhaps also possible to just call gtk_main(), but not
sure how sync will work then
*/
usleep(1*1000);
}
}
static gboolean mouse_pressed(GtkWidget *widget, GdkEventButton *event,
gpointer user_data)
{
mouse_btn = LV_INDEV_STATE_PR;
// Important, if this function returns TRUE the window cannot be moved around inside the browser
// when using broadway
return FALSE;
}
static gboolean mouse_released(GtkWidget *widget, GdkEventButton *event,
gpointer user_data)
{
mouse_btn = LV_INDEV_STATE_REL;
// Important, if this function returns TRUE the window cannot be moved around inside the browser
// when using broadway
return FALSE;
}
/*****************************************************************************/
static gboolean mouse_motion(GtkWidget *widget, GdkEventMotion *event,
gpointer user_data)
{
mouse_x = event->x;
mouse_y = event->y;
// Important, if this function returns TRUE the window cannot be moved around inside the browser
// when using broadway
return FALSE;
}
static gboolean keyboard_press(GtkWidget *widget, GdkEventKey *event,
gpointer user_data)
{
uint32_t ascii_key = event->keyval;
/*Remap some key to LV_KEY_... to manage groups*/
switch(event->keyval) {
case GDK_KEY_rightarrow:
case GDK_KEY_Right:
ascii_key = LV_KEY_RIGHT;
break;
case GDK_KEY_leftarrow:
case GDK_KEY_Left:
ascii_key = LV_KEY_LEFT;
break;
case GDK_KEY_uparrow:
case GDK_KEY_Up:
ascii_key = LV_KEY_UP;
break;
case GDK_KEY_downarrow:
case GDK_KEY_Down:
ascii_key = LV_KEY_DOWN;
break;
case GDK_KEY_Escape:
ascii_key = LV_KEY_ESC;
break;
case GDK_KEY_BackSpace:
ascii_key = LV_KEY_BACKSPACE;
break;
case GDK_KEY_Delete:
ascii_key = LV_KEY_DEL;
break;
case GDK_KEY_Tab:
ascii_key = LV_KEY_NEXT;
break;
case GDK_KEY_KP_Enter:
case GDK_KEY_Return:
case '\r':
ascii_key = LV_KEY_ENTER;
break;
default:
break;
}
last_key = ascii_key;
last_key_state = LV_INDEV_STATE_PR;
// For other codes refer to https://developer.gnome.org/gdk3/stable/gdk3-Event-Structures.html#GdkEventKey
return TRUE;
}
static gboolean keyboard_release(GtkWidget *widget, GdkEventKey *event,
gpointer user_data)
{
last_key = 0;
last_key_state = LV_INDEV_STATE_REL;
// For other codes refer to https://developer.gnome.org/gdk3/stable/gdk3-Event-Structures.html#GdkEventKey
return TRUE;
}
static void quit_handler(void)
{
exit(0);
run_gtk = FALSE;
}
#endif /*USE_GTK*/
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