[mapserver-commits] [mapserver/mapserver] eeb1e7: msProjectionsDiffer(): use proj4 string normalizat...

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/mapserver/mapserver
  Commit: eeb1e786a36e594ae8133f7a6d5b127175894952
      https://github.com/mapserver/mapserver/commit/eeb1e786a36e594ae8133f7a6d5b127175894952
  Author: Even Rouault <even.rouault at mines-paris.org>
  Date:   2014-12-16 (Tue, 16 Dec 2014)

  Changed paths:
    M mapproject.c

  Log Message:
  -----------
  msProjectionsDiffer(): use proj4 string normalization

If regular comparison detects a difference, then asks proj.4 to
return a proj string after it has resolved stuff like +init=epsg:XXXX.
This helps msDrawRasterLayerLow() figuring out that "init=epsg:3857"
and "+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +units=m +k=1.0 +nadgrids=@null"
as defined in maptile.h are indeed the same projection, to avoid
going to the slow resampling path.

I have tried instead to put that normalization logic into msProcessProjection()
itself but altering the p->args cause issues in a number of other
places.


  Commit: 5a22ae7b4f10f3e6b93e6ba842bc90d21a5ae1b9
      https://github.com/mapserver/mapserver/commit/5a22ae7b4f10f3e6b93e6ba842bc90d21a5ae1b9
  Author: Even Rouault <even.rouault at mines-paris.org>
  Date:   2014-12-16 (Tue, 16 Dec 2014)

  Changed paths:
    M mapresample.c

  Log Message:
  -----------
  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.


Compare: https://github.com/mapserver/mapserver/compare/6f1b34af5947...5a22ae7b4f10