Origin and corner points incorrect for pixel is point GeoJP2 JPEG2000

[degrootc]

When parsing a pixel is point GeoJP2 referenced JPEG2000, GDAL does not correctly adjust for point based referencing. This was discovered when using the Kakadu demo to convert point referenced GeoTIFF data to JPEG2000 files. When using gdalinfo the origin and corner points are off by half of the resolution of a pixel because they have not been adjusted.

The correct adjustment logic for points is shown in the geotiff.ccp source file lines 6553-6557

if( bPixelIsPoint && !bPointGeoIgnore )
{
    adfGeoTransform[0] -= (adfGeoTransform[1] * 0.5 + adfGeoTransform[2] * 0.5);
    adfGeoTransform[3] -= (adfGeoTransform[4] * 0.5 + adfGeoTransform[5] * 0.5);
}

The gt_kwt_srs.cpp function GTIFWktFromMemBuf is used to parse the GeoTIFF box and calculate the origin for JPEG2000 files. The code listed above is missing from this function, therefore it does not correctly adjust the origin, and by extension the corner points.

I attached a patch file which should resolve this issue.

[degrootc]

Patch file to add pixel is point check

[degrootc]

Diff file showing changes to add pixel is point check