printing.c

#include "printing.h"

static GList* list;
static GtkPrintSettings *settings = NULL;

static void begin_print (GtkPrintOperation * oper, GtkPrintContext * context, 
            			  gint nr, gpointer user_data)
{	
  cairo_t *cr = gtk_print_context_get_cairo_context (context);
  GtkPrintSettings* settings = gtk_print_operation_get_print_settings(oper);	
  GtkPaperSize* page_size = gtk_print_settings_get_paper_size(settings);

  gint page_width = (gint)gtk_paper_size_get_width(settings, GTK_UNIT_PIXEL);
  gint page_height = (gint)gtk_paper_size_get_height(settings, GTK_UNIT_PIXEL);


  GdkPixbuf* pixbuf = gdk_pixbuf_new_from_file(file_path_for_print,NULL);
	
  int image_width = gdk_pixbuf_get_width(pixbuf);
  int image_height = gdk_pixbuf_get_height(pixbuf);

  int n_xpages = (image_width / page_width) + image_width % page_width;
  int n_ypages = (image_height / page_height) + image_height % page_height;
  int n_all_pages = n_xpages * n_ypages;
	
  gtk_print_operation_set_n_pages(oper, 1);
}

static void draw_page (GtkPrintOperation * oper, GtkPrintContext * context, 
            			  gint nr, gpointer user_data)
{
  cairo_t *cr = gtk_print_context_get_cairo_context (context);
  GdkPixbuf* pixbuf = gdk_pixbuf_new_from_file(file_path_for_print,NULL);
	
  gdk_cairo_set_source_pixbuf(cr, pixbuf, 0, 0);
  cairo_paint(cr); 
}

void   print_pixbuf(GtkWidget* widget, MainWin *mw)
{	
    GtkPrintOperation *op;
    GtkPrintOperationResult res;

    op = gtk_print_operation_new ();
	
    gtk_print_operation_set_unit (op, GTK_UNIT_PIXEL);
    g_signal_connect (op, "begin-print", G_CALLBACK (begin_print),NULL);
    g_signal_connect (op, "draw-page", G_CALLBACK (draw_page),  NULL);
    res = gtk_print_operation_run (op, GTK_PRINT_OPERATION_ACTION_PRINT_DIALOG, NULL, NULL);
	
    g_object_unref (op);
}