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fix(preview): only downscale preview images, never upscale

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Fixes #4733
This commit is contained in:
anthony.bilinski 2017-10-13 14:52:27 -07:00
parent 2f1bf10780
commit 45b3575d79
1 changed files with 12 additions and 2 deletions
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14
src/chatlog/content/filetransferwidget.cpp
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@ -549,8 +549,18 @@ void FileTransferWidget::showPreview(const QString& filename)
ui->previewButton->show();
// Show mouseover preview, but make sure it's not larger than 50% of the screen width/height
const QRect desktopSize = QApplication::desktop()->screenGeometry();
const QImage previewImage = image.scaled(0.5 * desktopSize.width(), 0.5 * desktopSize.height(),
Qt::KeepAspectRatio, Qt::SmoothTransformation);
const int maxPreviewWidth{desktopSize.width() / 2};
const int maxPreviewHeight{desktopSize.height() /2};
const QImage previewImage = [&image, maxPreviewWidth, maxPreviewHeight]() {
if (image.width() > maxPreviewWidth || image.height() > maxPreviewHeight) {
return image.scaled(maxPreviewWidth, maxPreviewHeight,
Qt::KeepAspectRatio, Qt::SmoothTransformation);
}
else {
return image;
}
}();
QByteArray imageData;
QBuffer buffer(&imageData);
buffer.open(QIODevice::WriteOnly);