Use Color::is_straight(). Also, re-enable the optimization for straight blending...

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

diff --git a/synfig-core/trunk/src/synfig/context.cpp b/synfig-core/trunk/src/synfig/context.cpp
index 3bd36b7..d16c06b 100644 (file)
--- a/synfig-core/trunk/src/synfig/context.cpp
+++ b/synfig-core/trunk/src/synfig/context.cpp
@@ -202,7 +202,7 @@ Context::accelerated_render(Surface *surface,int quality, const RendDesc &rendde
                if(layer_bounds.area() <= 0.0000000000001 || !(layer_bounds && bbox))
                {
                        if (composite &&
-                               composite->get_blend_method() == Color::BLEND_STRAIGHT &&
+                               Color::is_straight(composite->get_blend_method()) &&
                                composite->get_amount() != 0.0f)
                        {
                                straight_and_empty = true;
@@ -211,18 +211,18 @@ Context::accelerated_render(Surface *surface,int quality, const RendDesc &rendde
                        continue;
                }
 
-// the following breaks the blur layer when used with the straight blend method
-// in that case we do want to render the context, to know what to blur
-//
-//             // If this layer has Straight as the blend method and amount is 1.0
-//             // then we don't want to render the context
-//             if (composite && composite->get_blend_method() == Color::BLEND_STRAIGHT &&
-//                     composite->get_amount() == 1.0f)
-//             {
-//                     Layer::Handle layer = *context;
-//                     while (!context->empty()) context++; // skip the context
-//                     return layer->accelerated_render(context,surface,quality,renddesc, cb);
-//             }
+               // If this layer has Straight as the blend method and amount
+               // is 1.0, and the layer doesn't depend on its context, then
+               // we don't want to render the context
+               if (composite &&
+                       Color::is_straight(composite->get_blend_method()) &&
+                       composite->get_amount() == 1.0f &&
+                       !composite->reads_context())
+               {
+                       Layer::Handle layer = *context;
+                       while (!context->empty()) context++; // skip the context
+                       return layer->accelerated_render(context,surface,quality,renddesc, cb);
+               }
 
                // Break out of the loop--we have found a good layer
                break;