X-Git-Url: https://git.pterodactylus.net/?a=blobdiff_plain;f=synfig-core%2Ftrunk%2Fsrc%2Fsynfig%2Ftarget_scanline.cpp;h=b4745fed127eb3dd7ae9d827aac12812254d4764;hb=ca157a87151421913925eaef67fdd402bbdc8c8f;hp=49cff08ce14d4f0b54f0bedb158cef0c86180a98;hpb=4d6768f7b34e72b810ccccc920ecd677ac5e4afc;p=synfig.git

diff --git a/synfig-core/trunk/src/synfig/target_scanline.cpp b/synfig-core/trunk/src/synfig/target_scanline.cpp
index 49cff08..b4745fe 100644
--- 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