A shared image resizer to be used in reflow() of element.
Resizing using dplug:graphics use a lot of memory,
so it can be better if this is a shared resource.
It is lazily constructed.
ImageResizer.
Note: do not use this resizer concurrently (in onDrawRaw, onDrawPBR, etc.)
unless you have flagDrawAloneRaw or flagDrawAlonePBR.
Usually intended for reflow().
A shared image resizer to be used in reflow() of element. Resizing using dplug:graphics use a lot of memory, so it can be better if this is a shared resource. It is lazily constructed.