[gdal-dev] Overviews using GDAL

[HariPrasad]

Hi Dmitry

I was inspecting various GDAL sources
(http://trac.osgeo.org/gdal/browser/trunk/gdal/frmts). I was bit confused
how to implement RasterIO method. Which format to look for better idea.

Should i call IRasterIO() method in IReadBlock? 

/CPLErr RBDRasterBand::IReadBlock( int nBlockXOff, int nBlockYOff, void *
pImage )
{
  return IRasterIO( GF_Read, nBlockXOff, nBlockYOff, nBlockXSize,
nBlockYSize, 
	                      pImage, nBlockXSize, nBlockYSize, eDataType, 
	                      GDALGetDataTypeSize(eDataType)/8, 0 );
}/

/CPLErr RBDRasterBand::IRasterIO( GDALRWFlag eRWFlag,
	                                 int nBlockXOff, int nBlockYOff, int
nXSize, int nYSize,
	                                 void * pData, int nBufXSize, int
nBufYSize,
	                                 GDALDataType eBufType,
	                                 int nPixelSpace, int nLineSpace )
{
    //my logic
}/


Earlier we were using ERDAS method to get the handle
/long LayerRasterRead( void *lHandle, unsigned long bRow, unsigned long
bCol,
			            unsigned char **pixels )
{
//logic
}/

Is there any method similar to get the handle in GDAL?





--
View this message in context: http://osgeo-org.1560.n6.nabble.com/Overviews-using-GDAL-tp5022226p5024588.html
Sent from the GDAL - Dev mailing list archive at Nabble.com.