[gthumb: 101/129] rotate tool: Added center of rotation

[Paolo Bacchilega <paobac src gnome org>]

commit 4ab76b188967cecc4427aa5d8dea5ca3013c58f8
Author: Stefano Pettini <spettini users sourceforge net>
Date:   Wed Apr 20 17:18:12 2011 +0100

    rotate tool: Added center of rotation

 extensions/file_tools/gdk-pixbuf-rotate.c    |   42 +++++++++++++++++++++----
 extensions/file_tools/gdk-pixbuf-rotate.h    |    2 +
 extensions/file_tools/gth-file-tool-rotate.c |    9 ++++-
 3 files changed, 44 insertions(+), 9 deletions(-)
---
diff --git a/extensions/file_tools/gdk-pixbuf-rotate.c b/extensions/file_tools/gdk-pixbuf-rotate.c
index b90dcb9..96fb73c 100644
--- a/extensions/file_tools/gdk-pixbuf-rotate.c
+++ b/extensions/file_tools/gdk-pixbuf-rotate.c
@@ -24,22 +24,50 @@
 
 
 GdkPixbuf*
+_gdk_pixbuf_rotate_crop (GdkPixbuf *src_pixbuf,
+			 int        center_x,
+			 int        center_y,
+			 double     angle)
+{
+	// TODO: implement the algorithm
+	
+	g_object_ref (src_pixbuf);
+	return src_pixbuf;
+}
+
+
+GdkPixbuf*
+_gdk_pixbuf_rotate_no_crop (GdkPixbuf *src_pixbuf,
+			    int        center_x,
+			    int        center_y,
+			    double     angle)
+{
+	// TODO: implement the algorithm
+	
+	g_object_ref (src_pixbuf);
+	return src_pixbuf;
+}
+
+
+GdkPixbuf*
 _gdk_pixbuf_rotate (GdkPixbuf *src_pixbuf,
+		    int        center_x,
+		    int        center_y,
 		    double     angle,
 		    gint       auto_crop)
 {
 	GdkPixbuf *new_pixbuf;
 	
-	if (angle > 45.0) {
-		new_pixbuf = _gdk_pixbuf_transform (src_pixbuf, GTH_TRANSFORM_ROTATE_90);
+	if (angle == 0.0) {
+		new_pixbuf = src_pixbuf;
+		g_object_ref (new_pixbuf);
 	}
-	else if (angle < -45.0) {
-		new_pixbuf = _gdk_pixbuf_transform (src_pixbuf, GTH_TRANSFORM_ROTATE_270);
+	else if (auto_crop) {
+		new_pixbuf = _gdk_pixbuf_rotate_crop (src_pixbuf, center_x, center_y, angle);
 	}
 	else {
-		new_pixbuf = src_pixbuf;
-		g_object_ref (new_pixbuf);
+		new_pixbuf = _gdk_pixbuf_rotate_no_crop (src_pixbuf, center_x, center_y, angle);
 	}
-	
+
 	return new_pixbuf;
 }
diff --git a/extensions/file_tools/gdk-pixbuf-rotate.h b/extensions/file_tools/gdk-pixbuf-rotate.h
index 4566f5e..8749bc4 100644
--- a/extensions/file_tools/gdk-pixbuf-rotate.h
+++ b/extensions/file_tools/gdk-pixbuf-rotate.h
@@ -29,6 +29,8 @@
 G_BEGIN_DECLS
 
 GdkPixbuf* _gdk_pixbuf_rotate (GdkPixbuf *src_pixbuf,
+			       int        center_x,
+			       int        center_y,
 			       double     angle,
 			       gint       auto_crop);
 
diff --git a/extensions/file_tools/gth-file-tool-rotate.c b/extensions/file_tools/gth-file-tool-rotate.c
index c4db81b..2747105 100644
--- a/extensions/file_tools/gth-file-tool-rotate.c
+++ b/extensions/file_tools/gth-file-tool-rotate.c
@@ -107,6 +107,8 @@ apply_cb (gpointer user_data)
 	GtkWidget         *window;
 	GtkWidget         *viewer_page;
 	double             rotation_angle;
+	int                center_x;
+	int                center_y;
 	gint               auto_crop;
 
 	if (self->priv->apply_event != 0) {
@@ -118,11 +120,14 @@ apply_cb (gpointer user_data)
 	viewer_page = gth_browser_get_viewer_page (GTH_BROWSER (window));
 
 	rotation_angle = gtk_adjustment_get_value (self->priv->rotation_angle_adj);
-	auto_crop = gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (self->priv->auto_crop));
 	
 	if (rotation_angle != 0.0) {
+		center_x = self->priv->pixbuf_width / 2;
+		center_y = self->priv->pixbuf_height / 2;
+		auto_crop = gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (self->priv->auto_crop));
+		
 		_g_object_unref (self->priv->dest_pixbuf);
-		self->priv->dest_pixbuf = _gdk_pixbuf_rotate (self->priv->src_pixbuf, rotation_angle, auto_crop);
+		self->priv->dest_pixbuf = _gdk_pixbuf_rotate (self->priv->src_pixbuf, rotation_angle, center_x, center_y, auto_crop);
 
 		gth_image_viewer_page_set_pixbuf (GTH_IMAGE_VIEWER_PAGE (viewer_page), self->priv->dest_pixbuf, FALSE);
 	}