[raster] ST_AsRaster problem with scale being < 1.

[dustymugs]

The following fails to properly burn the specified value to the generated raster. If both scales are ≥ 1, there are no problems. Need to see how gdal_rasterize utility works around the problem.

SELECT ST_Value(ST_AsRaster(ST_MakePoint(0, 0), 0.1, 0.1), 1, 1);

SELECT ST_Value(ST_AsRaster(ST_MakeLine(ARRAY[
	ST_MakePoint(0, 0),
	ST_MakePoint(1, 0)
]), 0.1, 0.1), 1, 1);

[dustymugs]

Can't fix as testing identical geometries with PostGIS and gdal_rasterize showed that the behavior displayed in PostGIS matched that of gdal_rasterize. Might be a gdal bug?

[dustymugs]

Further testing after upgrading GDAL to trunk r23097 showed that this problem resolved itself with the latest revision.