D22114: Add saving thumbnails for projects

[Alexander Semke]

asemke added inline comments.

INLINE COMMENTS

> Project.cpp:246
> +	buffer.open(QIODevice::WriteOnly);
> +	thumbnail.save(&buffer, "JPEG");
> +	QString image = QString::fromLatin1(bArray.toBase64().data());

We need to scale down the pixmap to a reasonable size. Something like 512x512px would be enough for the preview thumbnail. We don't need to save with the full resolution of a 4K monitor.

REPOSITORY
  R262 LabPlot

REVISION DETAIL
  https://phabricator.kde.org/D22114

To: ferenczkovacs, asemke, fkristof
Cc: kde-edu, narvaez, apol
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