[cairo] [PATCH 36/39] [OpenVG] added a logical clock to keep track of dirt.

[tardyp at gmail.com]

From: Øyvind Kolås <pippin at gimp.org>

---
 src/cairo-surface-private.h |    2 ++
 src/cairo-surface.c         |    4 ++++
 2 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/src/cairo-surface-private.h b/src/cairo-surface-private.h
index c25b6dc..4e6d1a8 100644
--- a/src/cairo-surface-private.h
+++ b/src/cairo-surface-private.h
@@ -108,6 +108,8 @@ struct _cairo_surface {
      */
     cairo_bool_t has_font_options;
     cairo_font_options_t font_options;
+
+    unsigned int dirt_serial;
 };
 
 #endif /* CAIRO_SURFACE_PRIVATE_H */
diff --git a/src/cairo-surface.c b/src/cairo-surface.c
index 16e8492..f57e692 100644
--- a/src/cairo-surface.c
+++ b/src/cairo-surface.c
@@ -1072,6 +1072,10 @@ cairo_surface_mark_dirty_rectangle (cairo_surface_t *surface,
 	status = _cairo_surface_set_error (surface, CAIRO_STATUS_SURFACE_FINISHED);
 	return;
     }
+   
+    /* increment the dirt serial, indicating that caches of the surface content
+     * is not valid */ 
+    surface->dirt_serial ++;
 
     /* The application *should* have called cairo_surface_flush() before
      * modifying the surface independently of cairo (and thus having to
-- 
1.6.0.4