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, 3 insertions, 1 deletions

diff --git a/console.h b/console.h
index 4172175..3518339 100644
--- a/console.h
+++ b/console.h
@@ -75,6 +75,7 @@ void kbd_put_keysym(int keysym);
 
 #define QEMU_BIG_ENDIAN_FLAG    0x01
 #define QEMU_ALLOCATED_FLAG     0x02
+#define QEMU_REALPIXELS_FLAG    0x04
 
 struct PixelFormat {
     uint8_t bits_per_pixel;
@@ -172,7 +173,8 @@ static inline int is_surface_bgr(DisplaySurface *surface)
 
 static inline int is_buffer_shared(DisplaySurface *surface)
 {
-    return (!(surface->flags & QEMU_ALLOCATED_FLAG));
+    return (!(surface->flags & QEMU_ALLOCATED_FLAG) &&
+            !(surface->flags & QEMU_REALPIXELS_FLAG));
 }
 
 static inline void register_displaychangelistener(DisplayState *ds, DisplayChangeListener *dcl)