tdesktop/Telegram/SourceFiles/media/media_clip_qtgif.h

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/*
This file is part of Telegram Desktop,
the official desktop version of Telegram messaging app, see https://telegram.org
Telegram Desktop 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.
It 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.
In addition, as a special exception, the copyright holders give permission
to link the code of portions of this program with the OpenSSL library.
Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
*/
#pragma once
#include "media/media_clip_implementation.h"
namespace Media {
namespace Clip {
namespace internal {
class QtGifReaderImplementation : public ReaderImplementation {
public:
QtGifReaderImplementation(FileLocation *location, QByteArray *data);
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ReadResult readFramesTill(TimeMs frameMs, TimeMs systemMs) override;
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TimeMs frameRealTime() const override;
TimeMs framePresentationTime() const override;
bool renderFrame(QImage &to, bool &hasAlpha, const QSize &size) override;
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TimeMs durationMs() const override;
bool hasAudio() const override {
return false;
}
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bool start(Mode mode, TimeMs &positionMs) override;
~QtGifReaderImplementation();
private:
bool jumpToStart();
ReadResult readNextFrame();
Mode _mode = Mode::Normal;
std::unique_ptr<QImageReader> _reader;
int _framesLeft = 0;
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TimeMs _frameRealTime = 0;
TimeMs _frameTime = 0;
int _frameDelay = 0;
QImage _frame;
};
} // namespace internal
} // namespace Clip
} // namespace Media