Add comments saying not to disable the layer optimization.

git-svn-id: https://synfig.svn.sourceforge.net/svnroot/synfig@2266 1f10aa63-cdf2-0310-b900-c93c546f37ac

diff --git a/synfig-core/trunk/src/synfig/target_scanline.cpp b/synfig-core/trunk/src/synfig/target_scanline.cpp
index 49cff08..b4745fe 100644 (file)
--- a/synfig-core/trunk/src/synfig/target_scanline.cpp
+++ b/synfig-core/trunk/src/synfig/target_scanline.cpp
@@ -47,6 +47,12 @@ using namespace synfig;
 
 /* === M A C R O S ========================================================= */
 
+// 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
 
 #define PIXEL_RENDERING_LIMIT 1500000

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