tdesktop/Telegram/SourceFiles/media/media_clip_qtgif.cpp

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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
*/
#include "media/media_clip_qtgif.h"
namespace Media {
namespace Clip {
namespace internal {
QtGifReaderImplementation::QtGifReaderImplementation(FileLocation *location, QByteArray *data) : ReaderImplementation(location, data) {
}
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ReaderImplementation::ReadResult QtGifReaderImplementation::readFramesTill(TimeMs frameMs, TimeMs systemMs) {
if (!_frame.isNull() && _frameTime > frameMs) {
return ReadResult::Success;
}
auto readResult = readNextFrame();
if (readResult != ReadResult::Success || _frameTime > frameMs) {
return readResult;
}
readResult = readNextFrame();
if (_frameTime <= frameMs) {
_frameTime = frameMs + 5; // keep up
}
return readResult;
}
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TimeMs QtGifReaderImplementation::frameRealTime() const {
return _frameRealTime;
}
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TimeMs QtGifReaderImplementation::framePresentationTime() const {
return qMax(_frameTime, 0LL);
}
ReaderImplementation::ReadResult QtGifReaderImplementation::readNextFrame() {
if (_reader) _frameDelay = _reader->nextImageDelay();
if (_framesLeft < 1) {
if (_mode == Mode::Normal) {
return ReadResult::EndOfFile;
} else if (!jumpToStart()) {
return ReadResult::Error;
}
}
_frame = QImage(); // QGifHandler always reads first to internal QImage and returns it
if (!_reader->read(&_frame) || _frame.isNull()) {
return ReadResult::Error;
}
--_framesLeft;
_frameTime += _frameDelay;
_frameRealTime += _frameDelay;
return ReadResult::Success;
}
bool QtGifReaderImplementation::renderFrame(QImage &to, bool &hasAlpha, const QSize &size) {
t_assert(!_frame.isNull());
if (size.isEmpty() || size == _frame.size()) {
int32 w = _frame.width(), h = _frame.height();
if (to.width() == w && to.height() == h && to.format() == _frame.format()) {
if (to.byteCount() != _frame.byteCount()) {
int bpl = qMin(to.bytesPerLine(), _frame.bytesPerLine());
for (int i = 0; i < h; ++i) {
memcpy(to.scanLine(i), _frame.constScanLine(i), bpl);
}
} else {
memcpy(to.bits(), _frame.constBits(), _frame.byteCount());
}
} else {
to = _frame.copy();
}
} else {
to = _frame.scaled(size, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
}
hasAlpha = _frame.hasAlphaChannel();
_frame = QImage();
return true;
}
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TimeMs QtGifReaderImplementation::durationMs() const {
return 0; // not supported
}
bool QtGifReaderImplementation::start(Mode mode, TimeMs &positionMs) {
if (mode == Mode::Inspecting) {
return false;
}
_mode = mode;
return jumpToStart();
}
QtGifReaderImplementation::~QtGifReaderImplementation() = default;
bool QtGifReaderImplementation::jumpToStart() {
if (_reader && _reader->jumpToImage(0)) {
_framesLeft = _reader->imageCount();
return true;
}
_reader = nullptr;
initDevice();
_reader = std::make_unique<QImageReader>(_device);
#ifndef OS_MAC_OLD
_reader->setAutoTransform(true);
#endif // OS_MAC_OLD
if (!_reader->canRead() || !_reader->supportsAnimation()) {
return false;
}
_framesLeft = _reader->imageCount();
if (_framesLeft < 1) {
return false;
}
return true;
}
} // namespace internal
} // namespace Clip
} // namespace Media