CPLErr VRTWarpedRasterBand::IReadBlock( int nBlockXOff, int nBlockYOff, void * pImage ) { CPLErr eErr; VRTWarpedDataset *poWDS = (VRTWarpedDataset *) poDS; GDALRasterBlock *poBlock; poBlock = GetLockedBlockRef( nBlockXOff, nBlockYOff, TRUE ); eErr = poWDS->ProcessBlock( nBlockXOff, nBlockYOff ); if( eErr == CE_None && pImage != poBlock->GetDataRef() ) { int nDataBytes; nDataBytes = (GDALGetDataTypeSize(poBlock->GetDataType()) / 8) * poBlock->GetXSize() * poBlock->GetYSize(); memcpy( pImage, poBlock->GetDataRef(), nDataBytes ); } poBlock->DropLock(); return eErr; }