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/*
Copyright (C) 2024 Carl Hetherington <cth@carlh.net>
This file is part of DCP-o-matic.
DCP-o-matic 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 2 of the License, or
(at your option) any later version.
DCP-o-matic 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 DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
*/
#include "butler.h"
#include "closed_text_display.h"
#include "constants.h"
#include "dcp_text_track.h"
#include "dcpomatic_time.h"
#include "string_text.h"
#include "text_ring_buffers.h"
using std::weak_ptr;
using boost::optional;
void
ClosedTextDisplay::set_butler(weak_ptr<Butler> butler)
{
_butler = butler;
}
class ClosedTextSorter
{
public:
bool operator() (StringText const & a, StringText const & b)
{
return from_top(a) < from_top(b);
}
private:
float from_top (StringText const & c) const
{
switch (c.v_align()) {
case dcp::VAlign::TOP:
return c.v_position();
case dcp::VAlign::CENTER:
return c.v_position() + 0.5;
case dcp::VAlign::BOTTOM:
return 1.0 - c.v_position();
}
DCPOMATIC_ASSERT (false);
return 0;
}
};
bool
ClosedTextDisplay::update(dcpomatic::DCPTime time, optional<DCPTextTrack> track)
{
bool changed = false;
/* Clear _current if it should not be visible */
if (!_current.empty() && _current_period && !_current_period->contains(time)) {
_current = {};
_current_period = {};
changed = true;
}
/* Fill next if necessary and possible */
if (_next.empty() && track) {
if (auto butler = _butler.lock()) {
optional<TextRingBuffers::Data> data;
while (auto d = butler->get_closed_caption()) {
if (d->track == *track && d->period.to > time) {
data = d;
break;
}
}
if (data) {
auto to_show = data->text.string;
std::sort(to_show.begin(), to_show.end(), ClosedTextSorter());
auto j = to_show.begin();
int k = 0;
while (j != to_show.end() && k < MAX_CLOSED_CAPTION_LINES) {
_next.push_back(j->text());
++j;
++k;
}
_next_period = data->period;
}
}
}
/* Swap next in if it's time */
if (_next_period && _next_period->contains(time)) {
_current = _next;
_current_period = _next_period;
_next = {};
_next_period = {};
changed = true;
}
return changed;
}
void
ClosedTextDisplay::clear()
{
_current = {};
_current_period = {};
_next = {};
_next_period = {};
}
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