CPLErr GDALRescaledAlphaBand::IReadBlock( int nXBlockOff, int nYBlockOff,
void * pImage )
{
int nXSizeRequest = nBlockXSize;
if (nXBlockOff * nBlockXSize + nBlockXSize > nRasterXSize)
nXSizeRequest = nRasterXSize - nXBlockOff * nBlockXSize;
int nYSizeRequest = nBlockYSize;
if (nYBlockOff * nBlockYSize + nBlockYSize > nRasterYSize)
nYSizeRequest = nRasterYSize - nYBlockOff * nBlockYSize;
GDALRasterIOExtraArg sExtraArg;
INIT_RASTERIO_EXTRA_ARG(sExtraArg);
return IRasterIO(GF_Read, nXBlockOff * nBlockXSize, nYBlockOff * nBlockYSize,
nXSizeRequest, nYSizeRequest, pImage,
nXSizeRequest, nYSizeRequest, GDT_Byte,
1, nBlockXSize, &sExtraArg);
}
CPLErr VRTSourcedRasterBand::IReadBlock( int nBlockXOff, int nBlockYOff,
void * pImage )
{
int nPixelSize = GDALGetDataTypeSize(eDataType)/8;
int nReadXSize, nReadYSize;
if( (nBlockXOff+1) * nBlockXSize > GetXSize() )
nReadXSize = GetXSize() - nBlockXOff * nBlockXSize;
else
nReadXSize = nBlockXSize;
if( (nBlockYOff+1) * nBlockYSize > GetYSize() )
nReadYSize = GetYSize() - nBlockYOff * nBlockYSize;
else
nReadYSize = nBlockYSize;
return IRasterIO( GF_Read,
nBlockXOff * nBlockXSize, nBlockYOff * nBlockYSize,
nReadXSize, nReadYSize,
pImage, nReadXSize, nReadYSize, eDataType,
nPixelSize, nPixelSize * nBlockXSize );
}
CPLErr JP2LuraRasterBand::IReadBlock(int nBlockXOff, int nBlockYOff,
void * pImage)
{
JP2LuraDataset *poGDS = reinterpret_cast<JP2LuraDataset *>(poDS);
#ifdef DEBUG_VERBOSE
CPLDebug("JP2Lura", "IReadBlock(nBand=%d,nLevel=%d %d,%d)",
nBand, poGDS->iLevel, nBlockXOff, nBlockYOff);
#endif
int nXOff = nBlockXOff * nBlockXSize;
int nYOff = nBlockYOff * nBlockYSize;
int nXSize = nBlockXSize;
int nYSize = nBlockYSize;
if( nXOff + nXSize > nRasterXSize )
nXSize = nRasterXSize - nXOff;
if( nYOff + nYSize > nRasterYSize )
nYSize = nRasterYSize - nYOff;
GDALRasterIOExtraArg sExtraArgs;
INIT_RASTERIO_EXTRA_ARG(sExtraArgs);
const int nDTSizeBytes = GDALGetDataTypeSizeBytes(eDataType);
CPLErr eErr = IRasterIO(GF_Read, nXOff, nYOff, nXSize, nYSize,
pImage, nXSize, nYSize,
eDataType,
nDTSizeBytes,
nDTSizeBytes * nXSize,
&sExtraArgs);
// Unpack previously packed buffer if needed
if( eErr == CE_None && nXSize < nBlockXSize )
{
GByte* pabyData = reinterpret_cast<GByte*>(pImage);
for( int j = nYSize - 1; j >= 0; --j )
{
memmove( pabyData + j * nBlockXSize * nDTSizeBytes,
pabyData + j * nXSize * nDTSizeBytes,
nXSize * nDTSizeBytes );
}
}
// Caching other bands while we have the cached buffer valid
for( int iBand = 1;eErr == CE_None && iBand <= poGDS->nBands; iBand++ )
{
if( iBand == nBand )
continue;
JP2LuraRasterBand* poOtherBand =
reinterpret_cast<JP2LuraRasterBand*>(poGDS->GetRasterBand(iBand));
GDALRasterBlock* poBlock = poOtherBand->
TryGetLockedBlockRef(nBlockXOff,nBlockYOff);
if (poBlock != nullptr)
{
poBlock->DropLock();
continue;
}
poBlock = poOtherBand->
GetLockedBlockRef(nBlockXOff,nBlockYOff, TRUE);
if (poBlock == nullptr)
{
continue;
}
GByte* pabyData = reinterpret_cast<GByte*>(poBlock->GetDataRef());
eErr = poOtherBand->IRasterIO(GF_Read, nXOff, nYOff, nXSize, nYSize,
pabyData, nXSize, nYSize,
eDataType,
nDTSizeBytes,
nDTSizeBytes * nXSize,
&sExtraArgs);
// Unpack previously packed buffer if needed
if( eErr == CE_None && nXSize < nBlockXSize )
{
for( int j = nYSize - 1; j >= 0; --j )
{
memmove( pabyData + j * nBlockXSize * nDTSizeBytes,
pabyData + j * nXSize * nDTSizeBytes,
nXSize * nDTSizeBytes );
}
}
poBlock->DropLock();
}
return eErr;
}