exif autorotate for proofs

Find below a patch which adds auto-rotation of proof images based on image
EXIF information.  It is a revision of a proof-of-concept patch I did up for
gqview 2.0.4 which, for well documented reasons, didn't get anywhere after
submission.  The patch below is against geeqie 1.0.

The proof auto-rotation feature is controlled by a new setting in the
"convenience" section of the image preferences dialog.  This way the
existing behaviour is still available for those who want to use it.

I find this new feature very useful when preparing proofing sheets and I
suspect others would too.  Please consider this for inclusion in geeqie.

src/options.c

@@ -65,6 +65,7 @@ ConfOptions *init_options(ConfOptions *options)
 	memset(&options->image.border_color, 0, sizeof(options->image.border_color));
 	options->image.enable_read_ahead = TRUE;
 	options->image.exif_rotate_enable = TRUE;
+	options->image.exif_proof_rotate_enable = TRUE;
 	options->image.fit_window_to_image = FALSE;
 	options->image.limit_autofit_size = FALSE;
 	options->image.limit_window_size = TRUE;

src/options.h

@@ -50,6 +50,7 @@ struct _ConfOptions
 	/* image */
 	struct {
 		gboolean exif_rotate_enable;
+		gboolean exif_proof_rotate_enable;
 		guint scroll_reset_method;
 		gboolean fit_window_to_image;
 		gboolean limit_window_size;

src/preferences.c

@@ -285,6 +285,7 @@ static void config_window_apply(void)
 
 	options->update_on_time_change = c_options->update_on_time_change;
 	options->image.exif_rotate_enable = c_options->image.exif_rotate_enable;
+	options->image.exif_proof_rotate_enable = c_options->image.exif_proof_rotate_enable;
 
 	options->duplicates_similarity_threshold = c_options->duplicates_similarity_threshold;
 
@@ -1466,6 +1467,9 @@ static void config_tab_image(GtkWidget *notebook)
 
 	pref_checkbox_new_int(group, _("Auto rotate image using Exif information"),
 			      options->image.exif_rotate_enable, &c_options->image.exif_rotate_enable);
+
+	pref_checkbox_new_int(group, _("Auto rotate proofs using Exif information"),
+			      options->image.exif_proof_rotate_enable, &c_options->image.exif_proof_rotate_enable);
 }
 
 /* windows tab */

src/print.c

@@ -2206,6 +2206,10 @@ static void print_job_render_proof_loader_done(ImageLoader *il, gpointer data)
 
 	pixbuf = image_loader_get_pixbuf(il);
 
+	if (options->image.exif_proof_rotate_enable == TRUE) {
+		pixbuf = pixbuf_apply_orientation(pixbuf, il->fd->exif_orientation);
+	}
+
 	w = gdk_pixbuf_get_width(pixbuf);
 	h = gdk_pixbuf_get_height(pixbuf);