itsmattkc
79ee3bc3df
Fixes recurring design issue that the Blocks were a frequent exception to the DAG concept. The Blocks connecting to each others inputs/outputs while not necessarily being "dependent" on each other to produce an image continually causes issues while trying to create a rendering code path. This redesign should provide a more "directed" approach to the directed acyclic graph.
125 lines
3.1 KiB
C++
125 lines
3.1 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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* When overriding Node::copy(), the derivative class should also call Block::CopyParameters() on the new Block instance
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* which will copy the block's name, length, and media in point. It does not copy any node-specific parameters like any
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* input values or connections as per standard with Node::copy().
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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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enum Type {
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kClip,
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kGap,
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kTrack
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};
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virtual Type type() = 0;
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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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void set_in(const rational& in);
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void set_out(const rational& out);
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const rational &length();
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void set_length(const rational &length);
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void set_length_and_media_in(const rational &length);
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Block* previous();
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Block* next();
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void set_previous(Block* previous);
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void set_next(Block* next);
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NodeOutput* buffer_output();
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NodeOutput* block_output();
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const rational& media_in();
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void set_media_in(const rational& media_in);
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const QString& block_name();
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void set_block_name(const QString& name);
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static void Link(Block* a, Block* b);
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static void Link(QList<Block*> blocks);
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static void Unlink(Block* a, Block* b);
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static bool AreLinked(Block* a, Block* b);
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const QVector<Block*>& linked_clips();
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bool HasLinks();
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virtual bool IsBlock() override;
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virtual QVariant Value(NodeOutput* output) override;
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public slots:
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signals:
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/**
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* @brief Signal emitted when this Block is refreshed
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*
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* Can be used as essentially a "changed" signal for UI widgets to know when to update their views
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*/
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void Refreshed();
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void LengthChanged(const rational& length);
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protected:
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rational SequenceToMediaTime(const rational& sequence_time);
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rational MediaToSequenceTime(const rational& media_time);
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static void CopyParameters(Block* source, Block* dest);
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Block* previous_;
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Block* next_;
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private:
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NodeOutput* block_output_;
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NodeOutput* buffer_output_;
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rational length_;
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rational media_in_;
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rational in_point_;
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rational out_point_;
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QString block_name_;
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QVector<Block*> linked_clips_;
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};
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#endif // BLOCK_H
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