84 lines
2.5 KiB
C++
84 lines
2.5 KiB
C++
/***
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Olive - Non-Linear Video Editor
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Copyright (C) 2019 Olive Team
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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***/
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#ifndef BLOCK_H
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#define BLOCK_H
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#include "node/node.h"
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/**
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* @brief A Node that represents a block of time, also displayable on a Timeline
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*
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* This is an abstract function. Since different types of Block will provide their lengths in different ways, it's
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* necessary to subclass and override the length() function for a Block to be usable.
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*/
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class Block : public Node
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{
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Q_OBJECT
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public:
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Block();
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virtual QString Category() override;
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const rational& in();
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const rational& out();
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virtual rational length() = 0;
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virtual void set_length(const rational& length) = 0;
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virtual Block* previous();
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virtual Block* next();
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NodeOutput* texture_output();
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public slots:
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virtual void Process(const rational &time) override;
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/**
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* @brief Refreshes internal cache of in/out points up to date
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*
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* A block can only know truly know its in point by adding all the lengths of the clips before it. Since this can
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* become timeconsuming, blocks cache their in and out points for easy access, however this does mean their caches
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* need to stay up to date to provide accurate results. Whenever this or any surrounding Block is changed, it's
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* recommended to call Refresh().
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*
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* This function specifically sets the in point to the out point of the previous clip and sets its out point to the
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* in point + this block's length. Therefore, before calling Refresh() on a Block, it's necessary that all the
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* Blocks before it are accurate and up to date. You may need to traverse through the Block list (using previous())
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* and run Refresh() on all Blocks sequentially.
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*/
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void Refresh();
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protected:
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void RefreshSurrounds();
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private:
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NodeInput* previous_input_;
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NodeInput* next_input_;
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NodeOutput* block_output_;
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NodeOutput* texture_output_;
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rational in_point_;
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rational out_point_;
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};
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#endif // BLOCK_H
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