#include "pixbufs.h"

GdkPixbuf * scale_pixbuf_with_size( GdkPixbuf *original_pixbuf, int new_width, int new_height )
{
     GdkPixbuf *scaled_pixbuf;
     float scale_x, scale_y;
     gboolean pixbuf_has_alpha;

     scale_x = new_width / (float) gdk_pixbuf_get_width (original_pixbuf);
     scale_y = new_height / (float) gdk_pixbuf_get_height (original_pixbuf);
     pixbuf_has_alpha = gdk_pixbuf_get_has_alpha (original_pixbuf);

     /* create a new pixbuf with size adpated to scale */
     scaled_pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB,
				     pixbuf_has_alpha,
				     gdk_pixbuf_get_bits_per_sample (original_pixbuf),
				     new_width,
				     new_height);

     /* copy the scaled loaded pixbuf into the new one */
     gdk_pixbuf_scale (original_pixbuf,
		       scaled_pixbuf,
		       0, 0,
		       new_width, new_height,
		       0, 0,
		       scale_x, scale_y,
		       //GDK_INTERP_NEAREST); // <--- this crashes app???
		       //GDK_INTERP_TILES);
		       //GDK_INTERP_BILINEAR);
		       GDK_INTERP_HYPER);

     return scaled_pixbuf;
}

GtkWidget * drawing_area_from_pixbuf( GdkPixbuf *pixbuf )
{
     GtkWidget *drawing_area;
     int width = gdk_pixbuf_get_width (pixbuf);
     int height = gdk_pixbuf_get_height (pixbuf);

     /* create a drawing area */
     drawing_area = gtk_drawing_area_new (); 

     gtk_widget_set_size_request (drawing_area,
				  width, 
				  height);

     /* add a pointer to pixbuf in the drawing area widget */
     g_object_set_data (G_OBJECT (drawing_area), "pixbuf", pixbuf);

     return drawing_area;
}

void draw_pixbuf_on_area( GtkWidget *drawing_area, GdkPixbuf *pixbuf )
{
     int width = gdk_pixbuf_get_width (pixbuf);
     int height = gdk_pixbuf_get_height (pixbuf);

     gdk_window_clear (drawing_area->window); 

     if (gdk_pixbuf_get_has_alpha (pixbuf))
	  gdk_pixbuf_render_to_drawable (pixbuf,
					 drawing_area->window,
					 drawing_area->style->black_gc,
					 0, 0,
					 0, 0,
					 width, height,
					 GDK_RGB_DITHER_NORMAL,
					 0, 0);
     else
	  gdk_pixbuf_render_to_drawable_alpha (pixbuf,
					       drawing_area->window,
					       0, 0,
					       0, 0,
					       width, height,
					       GDK_PIXBUF_ALPHA_FULL,
					       0,
					       GDK_RGB_DITHER_NORMAL,
					       0, 0);
}