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QGIS uses small image preview icons for its layers in the legend and layer tree. How can I create these for a given layer as an image object (QIcon or QImage I presume)?
As I am looking for a PyQGIS solution, here is my existing code:
layer = iface.activeLayer()
How do I get this layer's preview icon?
For a QgsVectorLayer:
>>> renderer = layer.renderer()
>>> legendSymbolItems = renderer.legendSymbolItems()
>>> legendSymbolItem = legendSymbolItems[0] # more if more classes
>>> symbol = legendSymbolItem.symbol()
>>> symbol.asImage(QSize(256, 128))
<PyQt5.QtGui.QImage object at 0x7fd869197d80>
QgsSymbolLayerUtils.symbolPreviewIcon(layer.renderer().symbol(), QSize(16, 16)). Should work as well, if you need a QIcon :)