From 11835d3f37e54533659d195f48bf06feb609cbbe Mon Sep 17 00:00:00 2001
From: Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com>
Date: Sat, 16 Aug 2008 01:37:40 -0300
Subject: [PATCH] Added GTK+ widgets and shows a piece of the scaled image

---
 gdk.c | 47 ++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 40 insertions(+), 7 deletions(-)

diff --git a/gdk.c b/gdk.c
index 73e11d9..df84edb 100644
--- a/gdk.c
+++ b/gdk.c
@@ -17,23 +17,50 @@
  */
 
 
+#include <gtk/gtk.h>
 #include <gdk-pixbuf/gdk-pixbuf.h>
 
 #define FILENAME "/home/cascardo/fotos/debconf.jpg"
 #define WIDTH 800
 #define HEIGHT 600
 
+gboolean
+queue (gpointer data)
+{
+  gtk_widget_queue_draw (GTK_WIDGET (data));
+  return TRUE;
+}
+
+gboolean
+expose (GtkWidget *widget, GdkEventExpose *event, gpointer data)
+{
+  GdkPixbuf *picture;
+  GdkPixbuf *screen;
+  picture = (GdkPixbuf *) data;
+  screen = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8,
+                           event->area.width, event->area.height);
+  gdk_pixbuf_scale (picture, screen, 0, 0,
+                    event->area.width, event->area.height,
+		    -event->area.x, -event->area.y,
+		    4.0, 4.0, GDK_INTERP_HYPER);
+  gdk_draw_pixbuf (widget->window, NULL, screen, 0, 0, 0, 0, -1, -1,
+                   GDK_RGB_DITHER_NONE, 0, 0);
+  gdk_pixbuf_unref (screen);
+  return FALSE;
+}
+
 int
 main (int argc, char **argv)
 {
   char *filename;
   GdkPixbuf *picture;
-  GdkPixbuf *screen;
   GdkColorspace colorspace;
   gboolean has_alpha;
   int bits_per_sample;
   int width, height;
-  g_type_init ();
+  GtkWidget *window;
+  GtkWidget *draw;
+  gtk_init (&argc, &argv);
   if (argc < 2)
     filename = FILENAME;
   else
@@ -44,11 +71,17 @@ main (int argc, char **argv)
   bits_per_sample = gdk_pixbuf_get_bits_per_sample (picture);
   width = WIDTH;
   height = HEIGHT;
-  screen = gdk_pixbuf_new (colorspace, has_alpha, bits_per_sample,
-                           width, height);
-  gdk_pixbuf_scale (picture, screen, 0, 0, width, height, 0, 0, 2, 2,
-                    GDK_INTERP_BILINEAR);
+  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+  g_signal_connect (G_OBJECT (window), "destroy",
+                    G_CALLBACK (gtk_main_quit), NULL);
+  draw = gtk_drawing_area_new ();
+  gtk_widget_set_size_request (draw, width, height);
+  gtk_container_add (GTK_CONTAINER (window), draw);
+  gtk_widget_show_all (window);
+  g_signal_connect (G_OBJECT (draw), "expose_event",
+                    G_CALLBACK (expose), picture);
+  g_timeout_add (10, queue, draw);
+  gtk_main ();
   gdk_pixbuf_unref (picture);
-  gdk_pixbuf_unref (screen);
   return 0;
 }
-- 
2.20.1