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msResampleGDALToMap(): optimizations for tiled queries
If requesting at the raster resolution, on pixel boundaries, and no reprojection is involved, we don't need any resampling. And if coordinates and dimensions match an integral subsampling factor, no need to add pixel margin. This optimization helps a lot when operating with mode=tile and that the underlying raster is tiled and share the same tiling scheme as the queried tile mode.
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