CPLErr RasterliteDataset::IBuildOverviews( const char * pszResampling,
int nOverviews, int * panOverviewList,
int nBands, int * panBandList,
GDALProgressFunc pfnProgress,
void * pProgressData )
{
CPLErr eErr = CE_None;
if (nLevel != 0)
{
CPLError(CE_Failure, CPLE_AppDefined,
"Overviews can only be computed on the base dataset");
return CE_Failure;
}
if (osTableName.size() == 0)
return CE_Failure;
/* -------------------------------------------------------------------- */
/* If we don't have read access, then create the overviews */
/* externally. */
/* -------------------------------------------------------------------- */
if( GetAccess() != GA_Update )
{
CPLDebug( "Rasterlite",
"File open for read-only accessing, "
"creating overviews externally." );
if (nResolutions != 1)
{
CPLError(CE_Failure, CPLE_NotSupported,
"Cannot add external overviews to a "
"dataset with internal overviews");
return CE_Failure;
}
bCheckForExistingOverview = FALSE;
eErr = GDALDataset::IBuildOverviews(
pszResampling, nOverviews, panOverviewList,
nBands, panBandList, pfnProgress, pProgressData );
bCheckForExistingOverview = TRUE;
return eErr;
}
/* -------------------------------------------------------------------- */
/* If zero overviews were requested, we need to clear all */
/* existing overviews. */
/* -------------------------------------------------------------------- */
if (nOverviews == 0)
{
return CleanOverviews();
}
if( nBands != GetRasterCount() )
{
CPLError( CE_Failure, CPLE_NotSupported,
"Generation of overviews in RASTERLITE only"
" supported when operating on all bands.\n"
"Operation failed.\n" );
return CE_Failure;
}
if( !EQUALN(pszResampling, "NEAR", 4))
{
CPLError( CE_Failure, CPLE_NotSupported,
"Only NEAREST resampling is allowed for now "
"for RASTERLITE overviews");
return CE_Failure;
}
int i;
for(i=0;i<nOverviews && eErr == CE_None;i++)
{
if (panOverviewList[i] <= 1)
continue;
eErr = CleanOverviewLevel(panOverviewList[i]);
if (eErr == CE_None)
eErr = CreateOverviewLevel(panOverviewList[i], pfnProgress, pProgressData);
ReloadOverviews();
}
return eErr;
}
CPLErr RasterliteDataset::IBuildOverviews( const char * pszResampling,
int nOverviews, int * panOverviewList,
int nBands, int * panBandList,
GDALProgressFunc pfnProgress,
void * pProgressData )
{
CPLErr eErr = CE_None;
if (nLevel != 0)
{
CPLError(CE_Failure, CPLE_AppDefined,
"Overviews can only be computed on the base dataset");
return CE_Failure;
}
if (osTableName.size() == 0)
return CE_Failure;
/* -------------------------------------------------------------------- */
/* If we don't have read access, then create the overviews */
/* externally. */
/* -------------------------------------------------------------------- */
if( GetAccess() != GA_Update )
{
CPLDebug( "Rasterlite",
"File open for read-only accessing, "
"creating overviews externally." );
if (nResolutions != 1)
{
CPLError(CE_Failure, CPLE_NotSupported,
"Cannot add external overviews to a "
"dataset with internal overviews");
return CE_Failure;
}
bCheckForExistingOverview = FALSE;
eErr = GDALDataset::IBuildOverviews(
pszResampling, nOverviews, panOverviewList,
nBands, panBandList, pfnProgress, pProgressData );
bCheckForExistingOverview = TRUE;
return eErr;
}
/* -------------------------------------------------------------------- */
/* If zero overviews were requested, we need to clear all */
/* existing overviews. */
/* -------------------------------------------------------------------- */
if (nOverviews == 0)
{
return CleanOverviews();
}
if( nBands != GetRasterCount() )
{
CPLError( CE_Failure, CPLE_NotSupported,
"Generation of overviews in RASTERLITE only"
" supported when operating on all bands.\n"
"Operation failed.\n" );
return CE_Failure;
}
const char* pszOvrOptions = CPLGetConfigOption("RASTERLITE_OVR_OPTIONS", NULL);
char** papszOptions = (pszOvrOptions) ? CSLTokenizeString2( pszOvrOptions, ",", 0) : NULL;
GDALValidateCreationOptions( GetDriver(), papszOptions);
int i;
for(i=0;i<nOverviews && eErr == CE_None;i++)
{
if (panOverviewList[i] <= 1)
continue;
eErr = CleanOverviewLevel(panOverviewList[i]);
if (eErr == CE_None)
eErr = CreateOverviewLevel(pszResampling, panOverviewList[i], papszOptions, pfnProgress, pProgressData);
ReloadOverviews();
}
CSLDestroy(papszOptions);
return eErr;
}
