Remove .gitignore do nothing is ignored.

[synfig.git] / synfig-core / trunk / src / synfig / target_tile.cpp

diff --git a/synfig-core/trunk/src/synfig/target_tile.cpp b/synfig-core/trunk/src/synfig/target_tile.cpp
index ef81d5a..f02b71b 100644 (file)
--- a/synfig-core/trunk/src/synfig/target_tile.cpp
+++ b/synfig-core/trunk/src/synfig/target_tile.cpp
@@ -51,7 +51,14 @@ using namespace synfig;
 const unsigned int     DEF_TILE_WIDTH = TILE_SIZE / 2;
 const unsigned int     DEF_TILE_HEIGHT= TILE_SIZE / 2;
 
+// note that if this isn't defined then the rendering is incorrect for
+// the straight blend method since the optimize_layers() function in
+// canvas.cpp which makes the straight blend method work correctly
+// isn't called.  ie. leave this defined.  to see the problem, draw a
+// small circle over a solid background.  set circle to amount 0.99
+// and blend method 'straight'.  the background should vanish but doesn't
 #define SYNFIG_OPTIMIZE_LAYER_TREE
+
 #ifdef _DEBUG
 // #define SYNFIG_DISPLAY_EFFICIENCY
 #endif