image.push_back(0); // Alpha black
- // Render the backdrop
+ // Render the backdrop on the surface layer's surface.
if(!context.accelerated_render(&surfacelayer->surface,quality,renddesc,&stageone))
return false;
-
+ // Sets up the interpolation of the context (now the surface layer is the first one)
+ // depending on the quality
if(quality<=4)surfacelayer->c=3;else
if(quality<=5)surfacelayer->c=2;
else if(quality<=6)surfacelayer->c=1;
else surfacelayer->c=0;
surfacelayer->tl=renddesc.get_tl();
surfacelayer->br=renddesc.get_br();
+ // Sets the blend method to straight. See below
surfacelayer->set_blend_method(Color::BLEND_STRAIGHT);
-
+ // Push this layer on the image. The blending result is only this layer
+ // adn the surface layer. The rest of the context is ignored by the straight
+ // blend method of surface layer
image.push_front(const_cast<synfig::Layer_Composite*>(this));
// Set up a surface target
Layer::Vocab
Layer_Composite::get_param_vocab()const
{
+ //! First fills the returning vocabulary with the ancestor class
Layer::Vocab ret(Layer::get_param_vocab());
-
+ //! Now inserts the two parameters that this layer knows.
ret.push_back(ParamDesc(amount_,"amount")
.set_local_name(_("Amount"))
);
ValueBase
Layer_Composite::get_param(const String & param)const
{
+ //! First check if the parameter's string is known.
if(param=="amount")
return get_amount();
if(param=="blend_method")
return static_cast<int>(get_blend_method());
+ //! If it is unknown then call the ancestor's get param member
+ //! to see if it can handle that parameter's string.
return Layer::get_param(param);
}