AGG and Bilinear Resampling

[warmerdam]

Rob McCulley wrote:
> Okay,
> 
>  
> 
> I’ve finally had a moment to sit down and look at this again.  I’m using 
> the latest version of ms4w beta, which is based on beta 6.  On all of my 
> imagery, tiled or not, using the processing setting of 
> “RESAMPLE=BILINEAR” results in the raster layer not being drawn.  There 
> are no error messages, and a map image is created, but the raster layer 
> is not drawn.  Using either “RESAMPLE=NEAREST” and “RESAMPLE=AVERAGE” 
> results in the layer being drawn fine.  If I switch to using GD for 
> output, then “RESAMPLE=BILINEAR” works as it should, and the raster 
> layer is drawn.

Rob,

I have determined this is indeed a bug in mapresample.c (checking
for _USE_AGG instead of USE_AGG) and is present in the current release
candidate (RC2). 

[warmerdam]

I have applied r6881 which I believe fixes this issue, though I haven't actually tried to reproduce the problem or the fix myself.

Rob, could you verify and if the problem persists reopen this report?

Currently I don't know if this fix will make it into MapServer 5 since we are post RC2.