136 lines
3.9 KiB
C++
136 lines
3.9 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop version of Telegram messaging app, see https://telegram.org
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Telegram Desktop is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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It is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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In addition, as a special exception, the copyright holders give permission
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to link the code of portions of this program with the OpenSSL library.
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Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
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Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
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*/
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#include "media/media_clip_qtgif.h"
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namespace Media {
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namespace Clip {
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namespace internal {
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QtGifReaderImplementation::QtGifReaderImplementation(FileLocation *location, QByteArray *data) : ReaderImplementation(location, data) {
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}
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ReaderImplementation::ReadResult QtGifReaderImplementation::readFramesTill(TimeMs frameMs, TimeMs systemMs) {
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if (!_frame.isNull() && _frameTime > frameMs) {
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return ReadResult::Success;
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}
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auto readResult = readNextFrame();
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if (readResult != ReadResult::Success || _frameTime > frameMs) {
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return readResult;
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}
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readResult = readNextFrame();
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if (_frameTime <= frameMs) {
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_frameTime = frameMs + 5; // keep up
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}
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return readResult;
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}
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TimeMs QtGifReaderImplementation::frameRealTime() const {
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return _frameRealTime;
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}
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TimeMs QtGifReaderImplementation::framePresentationTime() const {
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return qMax(_frameTime, 0LL);
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}
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ReaderImplementation::ReadResult QtGifReaderImplementation::readNextFrame() {
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if (_reader) _frameDelay = _reader->nextImageDelay();
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if (_framesLeft < 1) {
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if (_mode == Mode::Normal) {
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return ReadResult::EndOfFile;
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} else if (!jumpToStart()) {
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return ReadResult::Error;
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}
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}
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_frame = QImage(); // QGifHandler always reads first to internal QImage and returns it
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if (!_reader->read(&_frame) || _frame.isNull()) {
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return ReadResult::Error;
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}
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--_framesLeft;
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_frameTime += _frameDelay;
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_frameRealTime += _frameDelay;
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return ReadResult::Success;
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}
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bool QtGifReaderImplementation::renderFrame(QImage &to, bool &hasAlpha, const QSize &size) {
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t_assert(!_frame.isNull());
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if (size.isEmpty() || size == _frame.size()) {
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int32 w = _frame.width(), h = _frame.height();
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if (to.width() == w && to.height() == h && to.format() == _frame.format()) {
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if (to.byteCount() != _frame.byteCount()) {
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int bpl = qMin(to.bytesPerLine(), _frame.bytesPerLine());
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for (int i = 0; i < h; ++i) {
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memcpy(to.scanLine(i), _frame.constScanLine(i), bpl);
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}
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} else {
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memcpy(to.bits(), _frame.constBits(), _frame.byteCount());
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}
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} else {
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to = _frame.copy();
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}
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} else {
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to = _frame.scaled(size, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
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}
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hasAlpha = _frame.hasAlphaChannel();
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_frame = QImage();
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return true;
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}
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TimeMs QtGifReaderImplementation::durationMs() const {
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return 0; // not supported
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}
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bool QtGifReaderImplementation::start(Mode mode, TimeMs &positionMs) {
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if (mode == Mode::Inspecting) {
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return false;
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}
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_mode = mode;
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return jumpToStart();
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}
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QtGifReaderImplementation::~QtGifReaderImplementation() = default;
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bool QtGifReaderImplementation::jumpToStart() {
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if (_reader && _reader->jumpToImage(0)) {
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_framesLeft = _reader->imageCount();
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return true;
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}
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_reader = nullptr;
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initDevice();
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_reader = std::make_unique<QImageReader>(_device);
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#ifndef OS_MAC_OLD
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_reader->setAutoTransform(true);
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#endif // OS_MAC_OLD
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if (!_reader->canRead() || !_reader->supportsAnimation()) {
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return false;
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}
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_framesLeft = _reader->imageCount();
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if (_framesLeft < 1) {
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return false;
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}
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return true;
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}
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} // namespace internal
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} // namespace Clip
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} // namespace Media
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