Hey Eric,
> I looked at this a little more and can get the flicker. Testing on
> Ubuntu16.04 with GTK3.18 it works without flicker and on Ubuntu16.04
> with a jhbuild of GTK3.22 it does flicker. I tweaked your code a little
> so that I could test it a little easier.
Good, that you can reproduce it!
So what is your suggestion, how can we procceed with this issue? This is
very likely a bug in GTK, right?
Many thanks for our effort!
René
On 27.09.2017 22:00, cecashon@xxxxxxx wrote:
Hi Rene,
I looked at this a little more and can get the flicker. Testing on
Ubuntu16.04 with GTK3.18 it works without flicker and on Ubuntu16.04
with a jhbuild of GTK3.22 it does flicker. I tweaked your code a little
so that I could test it a little easier.
Eric
/*
gcc -Wall socket_plug1.c -o socket_plug1 `pkg-config --cflags
--libs gtk+-3.0`
Tested on Ubuntu16.04 and GTK3.18 and GTK3.22
Flickers with 3.22
*/
#include <cairo.h>
#include <gtk/gtkx.h>
//cairo_surface_t * image = NULL;
GdkPixbuf *image=NULL;
static GTimer *timer=NULL;
static guint timer_id=0;
gboolean timeout(gpointer data)
{
gtk_widget_queue_draw(GTK_WIDGET(data));
return TRUE;
}
gboolean draw_callback (GtkWidget *widget, cairo_t *cr, gpointer data)
{
g_timer_start(timer);
gint width=gtk_widget_get_allocated_width(widget);
gint height=gtk_widget_get_allocated_height(widget);
gint rect_x=width/10;
gint rect_y=height/10;
gint i=0;
gint j=0;
gint move_x=0;
gint move_y=0;
static gint overlap=0;
//Set some limits to draw with.
if(rect_x>20&&rect_y>20)
{
GdkPixbuf *pixbuf=gdk_pixbuf_scale_simple(image, rect_x, rect_y,
GDK_INTERP_BILINEAR);
for(i=0;i<10;i++)
{
for(j=0;j<10;j++)
{
gdk_cairo_set_source_pixbuf(cr, pixbuf, move_x, move_y);
cairo_paint(cr);
move_x+=rect_x-overlap;
}
move_x=0;
move_y+=rect_y;
}
g_object_unref(pixbuf);
if(overlap==20) overlap=0;
else overlap++;
}
else
{
//Just draw white if below the limit.
cairo_set_source_rgb(cr, 1.0, 1.0, 1.0);
cairo_paint(cr);
}
g_print("Timer %f\n", g_timer_elapsed(timer, NULL));
return FALSE;
}
static void quit_program(GtkWidget *widget, gpointer data)
{
g_source_remove(timer_id);
gtk_main_quit();
}
//-------------------------------------------------------------------------
int main(int argc, char** argv)
{
gtk_init (&argc, &argv);
//image =
cairo_image_surface_create_from_png("1200px-GTK+_logo.svg.png");
GError *error=NULL;
image = gdk_pixbuf_new_from_file("1200px-GTK+_logo.svg.png", &error);
if(error!=NULL) g_print("%s\n", error->message);
GtkWidget* window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_default_size(GTK_WINDOW(window), 400, 400);
g_signal_connect(window, "destroy", G_CALLBACK(quit_program), NULL);
timer=g_timer_new();
GtkWidget* socket = gtk_socket_new();
gtk_widget_set_hexpand(socket, TRUE);
gtk_widget_set_vexpand(socket, TRUE);
gtk_container_add(GTK_CONTAINER(window), socket);
Window socket_id = gtk_socket_get_id(GTK_SOCKET(socket));
GtkWidget* plug = gtk_plug_new(socket_id);
gtk_widget_set_hexpand(plug, TRUE);
gtk_widget_set_vexpand(plug, TRUE);
GtkWidget* drawing_area = gtk_drawing_area_new ();
gtk_widget_set_hexpand(drawing_area, TRUE);
gtk_widget_set_vexpand(drawing_area, TRUE);
gtk_container_add(GTK_CONTAINER(plug), drawing_area);
g_signal_connect (G_OBJECT (drawing_area), "draw", G_CALLBACK
(draw_callback), NULL);
timer_id=g_timeout_add(16, timeout, drawing_area);
gtk_widget_show_all(plug);
gtk_widget_show_all (window);
gtk_main ();
return 0;
}
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