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/*
Copyright (C) 2023 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/>.
*/
#ifndef DCPOMATIC_FONT_ID_ALLOCATOR_H
#define DCPOMATIC_FONT_ID_ALLOCATOR_H
#include <map>
#include <memory>
#include <string>
#include <vector>
namespace dcp {
class Reel;
class TextAsset;
}
/** A class which, given some pairs of (asset-id, font-id) can return a font ID
* which is unique in a piece of content.
*
* When we examine a 2-reel DCP we may have a pair of subtitle assets that
* each have a font with ID "foo". We want to store these in
* TextContent::_fonts in such a way that they are distinguishable.
*
* If TextContent is to carry on storing a list of dcpomatic::Font, we can
* only do this by making each dcpomatic::Font have a different ID (i.e. not
* both "foo").
*
* Hence when we add the fonts to the TextContent we re-write them to have
* unique IDs.
*
* When we do this, we must do it in a repeatable way so that when the
* DCPDecoder receives the "foo" font IDs it can obtain the same "new" ID given
* "foo" and the asset ID that it came from.
*
* FontIDAllocator can help with that: call add_fonts_from_reels() or add_font(),
* then allocate(), then it will return repeatable unique "new" font IDs from
* an asset map and "old" ID.
*/
class FontIDAllocator
{
public:
void add_fonts_from_reels(std::vector<std::shared_ptr<dcp::Reel>> const& reels);
void add_font(int reel_index, std::string asset_id, std::string font_id);
void allocate();
std::string font_id(int reel_index, std::string asset_id, std::string font_id) const;
private:
void add_fonts_from_asset(int reel_index, std::shared_ptr<const dcp::TextAsset> asset);
struct Font
{
Font(int reel_index_, std::string asset_id_, std::string font_id_)
: reel_index(reel_index_)
, asset_id(asset_id_)
, font_id(font_id_)
{}
bool operator<(Font const& other) const {
if (reel_index != other.reel_index) {
return reel_index < other.reel_index;
}
if (asset_id != other.asset_id) {
return asset_id < other.asset_id;
}
return font_id < other.font_id;
}
int reel_index;
std::string asset_id;
std::string font_id;
};
std::map<Font, int> _map;
};
#endif
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