I like the GTK drawing area for this sort of thing. With the drawing area you can rescale and draw your image when the size of the window changes automatically.
Make sure to add a picture to the following test code.
Eric
/*
gcc -Wall da_resize.c -o da_resize `pkg-config gtk+-3.0 --cflags --libs`
Tested on Ubuntu16.04, GTK3.18.
*/
#include<gtk/gtk.h>
gboolean draw_picture(GtkWidget *da, cairo_t *cr, gpointer data)
{
gint width=gtk_widget_get_allocated_width(da);
gint height=gtk_widget_get_allocated_height(da);
GdkPixbuf *temp=gdk_pixbuf_scale_simple((GdkPixbuf*)data, width, height, GDK_INTERP_BILINEAR);
gdk_cairo_set_source_pixbuf(cr, temp, 0, 0);
cairo_paint(cr);
g_object_unref(temp);
return FALSE;
}
int main(int argc, char *argv[])
{
gtk_init(&argc, &argv);
GtkWidget *window=gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_title(GTK_WINDOW(window), "Resize Picture");
gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
gtk_window_set_default_size(GTK_WINDOW(window), 400, 400);
g_signal_connect(window, "destroy", G_CALLBACK(gtk_main_quit), NULL);
//Needs a valid picture.
GdkPixbuf *pixbuf=gdk_pixbuf_new_from_file("headlight_toggle1.png", NULL);
GtkWidget *da1=gtk_drawing_area_new();
gtk_widget_set_hexpand(da1, TRUE);
gtk_widget_set_vexpand(da1, TRUE);
g_signal_connect(da1, "draw", G_CALLBACK(draw_picture), pixbuf);
GtkWidget *grid=gtk_grid_new();
gtk_grid_attach(GTK_GRID(grid), da1, 0, 0, 1, 1);
gtk_container_add(GTK_CONTAINER(window), grid);
gtk_widget_show_all(window);
gtk_main();
g_object_unref(pixbuf);
return 0;
}
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