oak-editor/app/node/block/block.cpp

/***

  Olive - Non-Linear Video Editor
  Copyright (C) 2019 Olive Team

  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program.  If not, see <http://www.gnu.org/licenses/>.

***/

#include "block.h"

#include <QDebug>

#include "node/output/track/track.h"
#include "transition/transition.h"

Block::Block() :
  previous_(nullptr),
  next_(nullptr)
{
  name_input_ = new NodeInput("name_in", NodeParam::kString);
  name_input_->SetConnectable(false);
  name_input_->set_is_keyframable(false);
  AddInput(name_input_);

  length_input_ = new NodeInput("length_in", NodeParam::kRational);
  length_input_->SetConnectable(false);
  length_input_->set_is_keyframable(false);
  AddInput(length_input_);
  connect(length_input_, SIGNAL(ValueChanged(const rational&, const rational&)), this, SLOT(LengthInputChanged()));

  media_in_input_ = new NodeInput("media_in_in", NodeParam::kRational);
  media_in_input_->SetConnectable(false);
  media_in_input_->set_is_keyframable(false);
  AddInput(media_in_input_);

  speed_input_ = new NodeInput("speed_in", NodeParam::kRational);
  speed_input_->set_standard_value(QVariant::fromValue(rational(1)));
  speed_input_->SetConnectable(false);
  speed_input_->set_is_keyframable(false);
  AddInput(speed_input_);

  // A block's length must be greater than 0
  set_length_and_media_out(1);
}

QString Block::Category() const
{
  return tr("Block");
}

const rational &Block::in() const
{
  return in_point_;
}

const rational &Block::out() const
{
  return out_point_;
}

void Block::set_in(const rational &in)
{
  in_point_ = in;
}

void Block::set_out(const rational &out)
{
  out_point_ = out;
}

rational Block::length() const
{
  return length_input_->get_standard_value().value<rational>();
}

void Block::set_length_and_media_out(const rational &length)
{
  Q_ASSERT(length > 0);

  if (length == this->length()) {
    return;
  }

  length_input_->set_standard_value(QVariant::fromValue(length));
}

void Block::set_length_and_media_in(const rational &length)
{
  Q_ASSERT(length > 0);

  if (length == this->length()) {
    return;
  }

  // Calculate media_in adjustment
  set_media_in(media_in() + (this->length() - length) * speed());

  // Set the length without setting media out
  set_length_and_media_out(length);
}

Block *Block::previous()
{
  return previous_;
}

Block *Block::next()
{
  return next_;
}

void Block::set_previous(Block *previous)
{
  previous_ = previous;
}

void Block::set_next(Block *next)
{
  next_ = next;
}

rational Block::media_in() const
{
  return media_in_input_->get_standard_value().value<rational>();
}

void Block::set_media_in(const rational &media_in)
{
  media_in_input_->set_standard_value(QVariant::fromValue(media_in));
}

rational Block::media_out() const
{
  return media_in() + length() * speed();
}

rational Block::speed() const
{
  return speed_input_->get_standard_value().value<rational>();
}

void Block::set_speed(const rational &speed)
{
  speed_input_->set_standard_value(QVariant::fromValue(speed));
}

bool Block::is_still() const
{
  return speed() == 0;
}

bool Block::is_reversed() const
{
  return speed() < 0;
}

QString Block::block_name() const
{
  return name_input_->get_standard_value().toString();
}

void Block::set_block_name(const QString &name)
{
  name_input_->set_standard_value(name);

  // FIXME: Signal the name has changed to update UI objects
}

rational Block::SequenceToMediaTime(const rational &sequence_time) const
{
  // These constants are not considered "values" per se, so we don't modify them
  if (sequence_time == RATIONAL_MIN || sequence_time == RATIONAL_MAX) {
    return sequence_time;
  }

  return (sequence_time - in()) * speed() + media_in();
}

rational Block::MediaToSequenceTime(const rational &media_time) const
{
  // These constants are not considered "values" per se, so we don't modify them
  if (media_time == RATIONAL_MIN || media_time == RATIONAL_MAX) {
    return media_time;
  }

  return (media_time - media_in()) / speed() + in();
}

void Block::LoadInternal(QXmlStreamReader *reader, XMLNodeData &xml_node_data)
{
  if (reader->name() == QStringLiteral("link")) {
    xml_node_data.block_links.append({this, reader->readElementText().toULongLong()});
  } else {
    Node::LoadInternal(reader, xml_node_data);
  }
}

void Block::SaveInternal(QXmlStreamWriter *writer) const
{
  foreach (Block* link, linked_clips_) {
    writer->writeTextElement(QStringLiteral("link"), QString::number(reinterpret_cast<quintptr>(link)));
  }
}

void Block::LengthInputChanged()
{
  emit LengthChanged(length());
}

bool Block::Link(Block *a, Block *b)
{
  if (a == b || !a || !b) {
    return false;
  }

  // Prevent duplicate link entries (assume that we only need to check one clip since this should be the only function
  // that adds to the linked array)
  if (Block::AreLinked(a, b)) {
    return false;
  }

  a->linked_clips_.append(b);
  b->linked_clips_.append(a);

  emit a->LinksChanged();
  emit b->LinksChanged();

  return true;
}

void Block::Link(const QList<Block*>& blocks)
{
  foreach (Block* a, blocks) {
    foreach (Block* b, blocks) {
      Link(a, b);
    }
  }
}

bool Block::Unlink(Block *a, Block *b)
{
  if (a == b || !a || !b) {
    return false;
  }

  if (!Block::AreLinked(a, b)) {
    return false;
  }

  a->linked_clips_.removeOne(b);
  b->linked_clips_.removeOne(a);

  emit a->LinksChanged();
  emit b->LinksChanged();

  return true;
}

void Block::Unlink(const QList<Block *> &blocks)
{
  foreach (Block* a, blocks) {
    foreach (Block* b, blocks) {
      Unlink(a, b);
    }
  }
}

bool Block::AreLinked(Block *a, Block *b)
{
  return a->linked_clips_.contains(b);
}

const QVector<Block*> &Block::linked_clips()
{
  return linked_clips_;
}

bool Block::HasLinks()
{
  return !linked_clips_.isEmpty();
}

bool Block::IsBlock() const
{
  return true;
}

void Block::Retranslate()
{
  Node::Retranslate();

  length_input_->set_name(tr("Length"));
  media_in_input_->set_name(tr("Media In"));
}

NodeInput *Block::length_input() const
{
  return length_input_;
}

NodeInput *Block::media_in_input() const
{
  return media_in_input_;
}

NodeInput *Block::speed_input() const
{
  return speed_input_;
}

void Block::InvalidateCache(const rational &start_range, const rational &end_range, NodeInput *from)
{
  // We ignore length changes since they don't have an effect on our frames
  if (from == length_input_) {
    return;
  }

  Node::InvalidateCache(start_range, end_range, from);
}