[QGIS-Developer] Help with on the fly CRS transformation

[Wu QC]

Hi,

I am looking for some method to reproject images without resampling, and I
realize that QGIS 'on the fly' CRS transformation (OTF) may do the trick.

so I looked into the source, not find where the code is, could anyone give
me some hints about how it works or which file I can see the source code?

many thanks
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