sdl zooming

Hi all,
this patch implements zooming capabilities for the sdl interface.
A new sdl_zoom_blit function is added that is able to scale and blit a
portion of a surface into another.
This way we can enable SDL_RESIZABLE and have a real_screen surface with
a different size than the guest surface and let sdl_zoom_blit take care
of the problem.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 25 insertions, 0 deletions

diff --git a/sdl_zoom.h b/sdl_zoom.h
new file mode 100644
index 0000000000..33dc63408b
--- /dev/null
+++ b/sdl_zoom.h
@@ -0,0 +1,25 @@
+/*
+ * SDL_zoom - surface scaling
+ * 
+ * Copyright (c) 2009 Citrix Systems, Inc.
+ *
+ * Derived from: SDL_rotozoom,  LGPL (c) A. Schiffler from the SDL_gfx library.
+ * Modifications by Stefano Stabellini.
+ *
+ * This work is licensed under the terms of the GNU GPL version 2.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#ifndef _SDL_zoom_h
+#define _SDL_zoom_h
+
+#include <SDL/SDL.h>
+
+#define SMOOTHING_OFF		0
+#define SMOOTHING_ON		1
+
+int sdl_zoom_blit(SDL_Surface *src_sfc, SDL_Surface *dst_sfc,
+                  int smooth, SDL_Rect *src_rect);
+
+#endif /* _SDL_zoom_h */