[SCM] calf/master: + Framework: add a function to line_graph_iface to support caching of partial graphs

[js at users.alioth.debian.org]

The following commit has been merged in the master branch:
commit f6c5a4a3443bd46cbcfd6ae8121660c69d55f86f
Author: Krzysztof Foltman <wdev at foltman.com>
Date:   Sat Jan 24 16:14:34 2009 +0000

    + Framework: add a function to line_graph_iface to support caching of partial graphs

diff --git a/src/calf/giface.h b/src/calf/giface.h
index eda0a25..cd1d1da 100644
--- a/src/calf/giface.h
+++ b/src/calf/giface.h
@@ -189,6 +189,14 @@ struct line_graph_iface
     /// @retval false graph data was not returned; subindex+1 graph does not exist either
     virtual bool get_static_graph(int index, int subindex, float value, float *data, int points, cairo_iface *context) { return false; }
     
+    /// Return which graphs need to be redrawn and which can be cached for later reuse
+    /// @param generation 0 (at start) or the last value returned by the function (corresponds to a set of input values)
+    /// @param subindex_graph First graph that has to be redrawn (because it depends on values that might have changed)
+    /// @param subindex_dot First dot that has to be redrawn
+    /// @param subindex_gridline First gridline/legend that has to be redrawn
+    /// @retval Current generation (to pass when calling the function next time); if different than passed generation value, call the function again to retrieve which graph offsets should be put into cache
+    virtual int get_changed_offsets(int generation, int &subindex_graph, int &subindex_dot, int &subindex_gridline) { subindex_graph = subindex_dot = subindex_gridline = 0; return 0; }
+    
     /// Standard destructor to make compiler happy
     virtual ~line_graph_iface() {}
 };

-- 
calf audio plugins packaging