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Summary: Previous PR to reduce fitsview zoom memory use created pixelated rendering for some overlays with large amount of zoom--e.g. when using a small view (e.g. around a focus view with subframe enabled. Here we employ a different rendering strategy when the view has a smaller number of pixels (and thus memory use shouldn't be as much of an issue) so that the rendering is smoother. Test Plan: Load fits images, try all the overlays, zoom in and out. Overlays should not change with images greater than a megapixel. Try this with various views with subframing (e.g. focus), and the rendering should be less pixelated. Reviewers: mutlaqja Reviewed By: mutlaqja Subscribers: kde-edu Tags: #kde_edu Differential Revision: https://phabricator.kde.org/D29192
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