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rasterio.cpp
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/******************************************************************************
*
* Project: GDAL Core
* Purpose: Contains default implementation of GDALRasterBand::IRasterIO()
* and supporting functions of broader utility.
* Author: Frank Warmerdam, [email protected]
*
******************************************************************************
* Copyright (c) 1998, Frank Warmerdam
* Copyright (c) 2007-2014, Even Rouault <even dot rouault at spatialys.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
****************************************************************************/
#include "cpl_port.h"
#include "gdal.h"
#include "gdal_priv.h"
#include <climits>
#include <cmath>
#include <cstddef>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <algorithm>
#include <limits>
#include <stdexcept>
#include <type_traits>
#include "cpl_conv.h"
#include "cpl_cpu_features.h"
#include "cpl_error.h"
#include "cpl_progress.h"
#include "cpl_string.h"
#include "cpl_vsi.h"
#include "gdal_priv_templates.hpp"
#include "gdal_vrt.h"
#include "gdalwarper.h"
#include "memdataset.h"
#include "vrtdataset.h"
CPL_CVSID("$Id$")
static void GDALFastCopyByte( const GByte * CPL_RESTRICT pSrcData,
int nSrcPixelStride,
GByte * CPL_RESTRICT pDstData,
int nDstPixelStride,
GPtrDiff_t nWordCount );
/************************************************************************/
/* DownsamplingIntegerXFactor() */
/************************************************************************/
template<bool bSameDataType, int DATA_TYPE_SIZE> static
bool DownsamplingIntegerXFactor(GDALRasterBand* poBand,
int iSrcX,
int nSrcXInc,
GPtrDiff_t iSrcOffsetCst,
GByte* CPL_RESTRICT pabyDstData,
int nPixelSpace,
int nBufXSize,
GDALDataType eDataType,
GDALDataType eBufType,
int& nStartBlockX,
int nBlockXSize,
GDALRasterBlock*& poBlock,
int nLBlockY)
{
const int nBandDataSize = bSameDataType ? DATA_TYPE_SIZE : GDALGetDataTypeSizeBytes( eDataType );
int nOuterLoopIters = nBufXSize - 1;
const int nIncSrcOffset = nSrcXInc * nBandDataSize;
const GByte* CPL_RESTRICT pabySrcData;
int nEndBlockX = nBlockXSize + nStartBlockX;
if( iSrcX < nEndBlockX )
{
CPLAssert(poBlock);
goto no_reload_block;
}
goto reload_block;
// Don't do the last iteration in the loop, as iSrcX might go beyond nRasterXSize - 1
while( --nOuterLoopIters >= 1 )
{
iSrcX += nSrcXInc;
pabySrcData += nIncSrcOffset;
pabyDstData += nPixelSpace;
/* -------------------------------------------------------------------- */
/* Ensure we have the appropriate block loaded. */
/* -------------------------------------------------------------------- */
if( iSrcX >= nEndBlockX )
{
reload_block:
{
const int nLBlockX = iSrcX / nBlockXSize;
nStartBlockX = nLBlockX * nBlockXSize;
nEndBlockX = nStartBlockX + nBlockXSize;
if( poBlock != nullptr )
poBlock->DropLock();
poBlock = poBand->GetLockedBlockRef( nLBlockX, nLBlockY, FALSE );
if( poBlock == nullptr )
{
return false;
}
}
no_reload_block:
const GByte* pabySrcBlock = static_cast<const GByte *>(poBlock->GetDataRef());
GPtrDiff_t iSrcOffset = (iSrcX - nStartBlockX + iSrcOffsetCst) * nBandDataSize;
pabySrcData = pabySrcBlock + iSrcOffset;
}
/* -------------------------------------------------------------------- */
/* Copy the maximum run of pixels. */
/* -------------------------------------------------------------------- */
const int nIters = std::min(
(nEndBlockX - iSrcX + (nSrcXInc - 1)) / nSrcXInc, nOuterLoopIters);
if( bSameDataType )
{
memcpy( pabyDstData, pabySrcData, nBandDataSize );
if( nIters > 1 )
{
if( DATA_TYPE_SIZE == 1 )
{
pabySrcData += nIncSrcOffset;
pabyDstData += nPixelSpace;
GDALFastCopyByte( pabySrcData, nIncSrcOffset,
pabyDstData, nPixelSpace,
nIters - 1 );
pabySrcData += static_cast<GPtrDiff_t>(nIncSrcOffset) * (nIters - 2);
pabyDstData += static_cast<GPtrDiff_t>(nPixelSpace) * (nIters - 2);
}
else
{
for( int i = 0; i < nIters - 1; i ++)
{
pabySrcData += nIncSrcOffset;
pabyDstData += nPixelSpace;
memcpy( pabyDstData, pabySrcData, nBandDataSize );
}
}
iSrcX += nSrcXInc * (nIters - 1);
nOuterLoopIters -= nIters - 1;
}
}
else
{
// Type to type conversion ...
GDALCopyWords(
pabySrcData, eDataType, nIncSrcOffset,
pabyDstData, eBufType, nPixelSpace,
std::max(1, nIters) );
if( nIters > 1 )
{
pabySrcData += static_cast<GPtrDiff_t>(nIncSrcOffset) * (nIters - 1);
pabyDstData += static_cast<GPtrDiff_t>(nPixelSpace) * (nIters - 1);
iSrcX += nSrcXInc * (nIters - 1);
nOuterLoopIters -= nIters - 1;
}
}
}
// Deal with last iteration to avoid iSrcX to go beyond nRasterXSize - 1
if( nOuterLoopIters == 0 )
{
const int nRasterXSize = poBand->GetXSize();
iSrcX = static_cast<int>(
std::min(static_cast<GInt64>(iSrcX) + nSrcXInc,
static_cast<GInt64>(nRasterXSize - 1)));
pabyDstData += nPixelSpace;
if( iSrcX < nEndBlockX )
{
goto no_reload_block;
}
goto reload_block;
}
return true;
}
/************************************************************************/
/* IRasterIO() */
/* */
/* Default internal implementation of RasterIO() ... utilizes */
/* the Block access methods to satisfy the request. This would */
/* normally only be overridden by formats with overviews. */
/************************************************************************/
CPLErr GDALRasterBand::IRasterIO( GDALRWFlag eRWFlag,
int nXOff, int nYOff, int nXSize, int nYSize,
void * pData, int nBufXSize, int nBufYSize,
GDALDataType eBufType,
GSpacing nPixelSpace, GSpacing nLineSpace,
GDALRasterIOExtraArg* psExtraArg )
{
if( eRWFlag == GF_Write && eFlushBlockErr != CE_None )
{
CPLError(eFlushBlockErr, CPLE_AppDefined,
"An error occurred while writing a dirty block "
"from GDALRasterBand::IRasterIO");
CPLErr eErr = eFlushBlockErr;
eFlushBlockErr = CE_None;
return eErr;
}
if( nBlockXSize <= 0 || nBlockYSize <= 0 )
{
CPLError( CE_Failure, CPLE_AppDefined, "Invalid block size" );
return CE_Failure;
}
const int nBandDataSize = GDALGetDataTypeSizeBytes( eDataType );
const int nBufDataSize = GDALGetDataTypeSizeBytes( eBufType );
GByte dummyBlock[2] = {0, 0};
GByte *pabySrcBlock = dummyBlock; /* to avoid Coverity warning about nullptr dereference */
GDALRasterBlock *poBlock = nullptr;
const bool bUseIntegerRequestCoords =
(!psExtraArg->bFloatingPointWindowValidity ||
(nXOff == psExtraArg->dfXOff &&
nYOff == psExtraArg->dfYOff &&
nXSize == psExtraArg->dfXSize &&
nYSize == psExtraArg->dfYSize));
/* ==================================================================== */
/* A common case is the data requested with the destination */
/* is packed, and the block width is the raster width. */
/* ==================================================================== */
if( nPixelSpace == nBufDataSize
&& nLineSpace == nPixelSpace * nXSize
&& nBlockXSize == GetXSize()
&& nBufXSize == nXSize
&& nBufYSize == nYSize
&& bUseIntegerRequestCoords )
{
CPLErr eErr = CE_None;
int nLBlockY = -1;
for( int iBufYOff = 0; iBufYOff < nBufYSize; iBufYOff++ )
{
const int iSrcY = iBufYOff + nYOff;
if( iSrcY < nLBlockY * nBlockYSize
|| iSrcY - nBlockYSize >= nLBlockY * nBlockYSize )
{
nLBlockY = iSrcY / nBlockYSize;
bool bJustInitialize =
eRWFlag == GF_Write
&& nXOff == 0 && nXSize == nBlockXSize
&& nYOff <= nLBlockY * nBlockYSize
&& nYOff + nYSize - nBlockYSize >= nLBlockY * nBlockYSize;
// Is this a partial tile at right and/or bottom edges of
// the raster, and that is going to be completely written?
// If so, do not load it from storage, but zero it so that
// the content outsize of the validity area is initialized.
bool bMemZeroBuffer = false;
if( eRWFlag == GF_Write && !bJustInitialize &&
nXOff == 0 && nXSize == nBlockXSize &&
nYOff <= nLBlockY * nBlockYSize &&
nYOff + nYSize == GetYSize() &&
nLBlockY * nBlockYSize > GetYSize() - nBlockYSize )
{
bJustInitialize = true;
bMemZeroBuffer = true;
}
if( poBlock )
poBlock->DropLock();
const GUInt32 nErrorCounter = CPLGetErrorCounter();
poBlock = GetLockedBlockRef( 0, nLBlockY, bJustInitialize );
if( poBlock == nullptr )
{
if( strstr(CPLGetLastErrorMsg(), "IReadBlock failed") == nullptr )
{
CPLError( CE_Failure, CPLE_AppDefined,
"GetBlockRef failed at X block offset %d, "
"Y block offset %d%s",
0, nLBlockY,
(nErrorCounter != CPLGetErrorCounter()) ?
CPLSPrintf(": %s", CPLGetLastErrorMsg()) : "");
}
eErr = CE_Failure;
break;
}
if( eRWFlag == GF_Write )
poBlock->MarkDirty();
pabySrcBlock = static_cast<GByte *>(poBlock->GetDataRef());
if( bMemZeroBuffer )
{
memset(pabySrcBlock, 0,
static_cast<GPtrDiff_t>(nBandDataSize) * nBlockXSize * nBlockYSize);
}
}
const auto nSrcByteOffset =
(static_cast<GPtrDiff_t>(iSrcY - nLBlockY * nBlockYSize) * nBlockXSize + nXOff)
* nBandDataSize;
if( eDataType == eBufType )
{
if( eRWFlag == GF_Read )
memcpy(
static_cast<GByte *>(pData)
+ static_cast<GPtrDiff_t>(iBufYOff) * nLineSpace,
pabySrcBlock + nSrcByteOffset,
static_cast<size_t>(nLineSpace) );
else
memcpy(
pabySrcBlock + nSrcByteOffset,
static_cast<GByte *>(pData)
+ static_cast<GPtrDiff_t>(iBufYOff) * nLineSpace,
static_cast<size_t>(nLineSpace) );
}
else
{
// Type to type conversion.
if( eRWFlag == GF_Read )
GDALCopyWords(
pabySrcBlock + nSrcByteOffset,
eDataType, nBandDataSize,
static_cast<GByte *>(pData)
+ static_cast<GPtrDiff_t>(iBufYOff) * nLineSpace,
eBufType,
static_cast<int>(nPixelSpace), nBufXSize );
else
GDALCopyWords(
static_cast<GByte *>(pData)
+ static_cast<GPtrDiff_t>(iBufYOff) * nLineSpace,
eBufType, static_cast<int>(nPixelSpace),
pabySrcBlock + nSrcByteOffset,
eDataType, nBandDataSize, nBufXSize );
}
if( psExtraArg->pfnProgress != nullptr &&
!psExtraArg->pfnProgress(1.0 * (iBufYOff + 1) / nBufYSize, "",
psExtraArg->pProgressData) )
{
eErr = CE_Failure;
break;
}
}
if( poBlock )
poBlock->DropLock();
return eErr;
}
/* ==================================================================== */
/* Do we have overviews that would be appropriate to satisfy */
/* this request? */
/* ==================================================================== */
if( (nBufXSize < nXSize || nBufYSize < nYSize)
&& GetOverviewCount() > 0 && eRWFlag == GF_Read )
{
GDALRasterIOExtraArg sExtraArg;
GDALCopyRasterIOExtraArg(&sExtraArg, psExtraArg);
const int nOverview =
GDALBandGetBestOverviewLevel2( this, nXOff, nYOff, nXSize, nYSize,
nBufXSize, nBufYSize, &sExtraArg );
if (nOverview >= 0)
{
GDALRasterBand* poOverviewBand = GetOverview(nOverview);
if (poOverviewBand == nullptr)
return CE_Failure;
return poOverviewBand->RasterIO(
eRWFlag, nXOff, nYOff, nXSize, nYSize,
pData, nBufXSize, nBufYSize, eBufType,
nPixelSpace, nLineSpace, &sExtraArg );
}
}
if( eRWFlag == GF_Read &&
nBufXSize < nXSize / 100 && nBufYSize < nYSize / 100 &&
nPixelSpace == nBufDataSize &&
nLineSpace == nPixelSpace * nBufXSize &&
CPLTestBool(CPLGetConfigOption("GDAL_NO_COSTLY_OVERVIEW", "NO")) )
{
memset( pData, 0, static_cast<size_t>(nLineSpace * nBufYSize) );
return CE_None;
}
/* ==================================================================== */
/* The second case when we don't need subsample data but likely */
/* need data type conversion. */
/* ==================================================================== */
if ( // nPixelSpace == nBufDataSize &&
nXSize == nBufXSize
&& nYSize == nBufYSize
&& bUseIntegerRequestCoords )
{
#if DEBUG_VERBOSE
printf( "IRasterIO(%d,%d,%d,%d) rw=%d case 2\n",/*ok*/
nXOff, nYOff, nXSize, nYSize,
static_cast<int>(eRWFlag) );
#endif
/* -------------------------------------------------------------------- */
/* Loop over buffer computing source locations. */
/* -------------------------------------------------------------------- */
// Calculate starting values out of loop
const int nLBlockXStart = nXOff / nBlockXSize;
const int nXSpanEnd = nBufXSize + nXOff;
int nYInc = 0;
for( int iBufYOff = 0, iSrcY = nYOff;
iBufYOff < nBufYSize;
iBufYOff += nYInc, iSrcY += nYInc )
{
GPtrDiff_t iSrcOffset = 0;
int nXSpan = 0;
GPtrDiff_t iBufOffset =
static_cast<GPtrDiff_t>(iBufYOff) *
static_cast<GPtrDiff_t>(nLineSpace);
int nLBlockY = iSrcY / nBlockYSize;
int nLBlockX = nLBlockXStart;
int iSrcX = nXOff;
while( iSrcX < nXSpanEnd )
{
nXSpan = nLBlockX * nBlockXSize;
if( nXSpan < INT_MAX - nBlockXSize )
nXSpan += nBlockXSize;
else
nXSpan = INT_MAX;
const int nXRight = nXSpan;
nXSpan = ( nXSpan < nXSpanEnd ? nXSpan:nXSpanEnd ) - iSrcX;
const size_t nXSpanSize = nXSpan * static_cast<size_t>(nPixelSpace);
bool bJustInitialize =
eRWFlag == GF_Write
&& nYOff <= nLBlockY * nBlockYSize
&& nYOff + nYSize - nBlockYSize >= nLBlockY * nBlockYSize
&& nXOff <= nLBlockX * nBlockXSize
&& nXOff + nXSize >= nXRight;
// Is this a partial tile at right and/or bottom edges of
// the raster, and that is going to be completely written?
// If so, do not load it from storage, but zero it so that
// the content outsize of the validity area is initialized.
bool bMemZeroBuffer = false;
if( eRWFlag == GF_Write && !bJustInitialize &&
nXOff <= nLBlockX * nBlockXSize &&
nYOff <= nLBlockY * nBlockYSize &&
(nXOff + nXSize >= nXRight ||
(nXOff + nXSize == GetXSize() &&
nXRight > GetXSize())) &&
(nYOff + nYSize - nBlockYSize >= nLBlockY * nBlockYSize ||
(nYOff + nYSize == GetYSize() &&
nLBlockY * nBlockYSize > GetYSize() - nBlockYSize)) )
{
bJustInitialize = true;
bMemZeroBuffer = true;
}
/* -------------------------------------------------------------------- */
/* Ensure we have the appropriate block loaded. */
/* -------------------------------------------------------------------- */
const GUInt32 nErrorCounter = CPLGetErrorCounter();
poBlock = GetLockedBlockRef( nLBlockX, nLBlockY,
bJustInitialize );
if( !poBlock )
{
if( strstr(CPLGetLastErrorMsg(), "IReadBlock failed") == nullptr )
{
CPLError( CE_Failure, CPLE_AppDefined,
"GetBlockRef failed at X block offset %d, "
"Y block offset %d%s",
nLBlockX, nLBlockY,
(nErrorCounter != CPLGetErrorCounter()) ?
CPLSPrintf(": %s", CPLGetLastErrorMsg()) : "");
}
return( CE_Failure );
}
if( eRWFlag == GF_Write )
poBlock->MarkDirty();
pabySrcBlock = static_cast<GByte *>(poBlock->GetDataRef());
if( bMemZeroBuffer )
{
memset(pabySrcBlock, 0,
static_cast<GPtrDiff_t>(nBandDataSize) * nBlockXSize * nBlockYSize);
}
/* -------------------------------------------------------------------- */
/* Copy over this chunk of data. */
/* -------------------------------------------------------------------- */
iSrcOffset =
(static_cast<GPtrDiff_t>(iSrcX)
- static_cast<GPtrDiff_t>(nLBlockX * nBlockXSize)
+ (static_cast<GPtrDiff_t>(iSrcY)
- static_cast<GPtrDiff_t>(nLBlockY) * nBlockYSize)
* nBlockXSize)
* nBandDataSize;
// Fill up as many rows as possible for the loaded block.
const int kmax = std::min(
nBlockYSize - (iSrcY % nBlockYSize), nBufYSize - iBufYOff );
for(int k=0; k<kmax;k++)
{
if( eDataType == eBufType
&& nPixelSpace == nBufDataSize )
{
if( eRWFlag == GF_Read )
memcpy( static_cast<GByte *>(pData) + iBufOffset
+ static_cast<GPtrDiff_t>(k) * nLineSpace,
pabySrcBlock + iSrcOffset,
nXSpanSize );
else
memcpy( pabySrcBlock + iSrcOffset,
static_cast<GByte *>(pData) + iBufOffset
+ static_cast<GPtrDiff_t>(k) * nLineSpace,
nXSpanSize );
}
else
{
/* type to type conversion */
if( eRWFlag == GF_Read )
GDALCopyWords(
pabySrcBlock + iSrcOffset,
eDataType, nBandDataSize,
static_cast<GByte *>(pData) + iBufOffset
+ static_cast<GPtrDiff_t>(k) * nLineSpace,
eBufType, static_cast<int>(nPixelSpace),
nXSpan );
else
GDALCopyWords(
static_cast<GByte *>(pData) + iBufOffset +
static_cast<GPtrDiff_t>(k) * nLineSpace,
eBufType, static_cast<int>(nPixelSpace),
pabySrcBlock + iSrcOffset,
eDataType, nBandDataSize, nXSpan );
}
iSrcOffset += nBlockXSize * nBandDataSize;
}
iBufOffset = CPLUnsanitizedAdd<GPtrDiff_t>(iBufOffset, nXSpanSize);
nLBlockX++;
iSrcX+=nXSpan;
poBlock->DropLock();
poBlock = nullptr;
}
/* Compute the increment to go on a block boundary */
nYInc = nBlockYSize - (iSrcY % nBlockYSize);
if( psExtraArg->pfnProgress != nullptr &&
!psExtraArg->pfnProgress(
1.0 * std::min(nBufYSize, iBufYOff + nYInc) / nBufYSize, "",
psExtraArg->pProgressData) )
{
return CE_Failure;
}
}
return CE_None;
}
/* ==================================================================== */
/* Loop reading required source blocks to satisfy output */
/* request. This is the most general implementation. */
/* ==================================================================== */
double dfXOff = nXOff;
double dfYOff = nYOff;
double dfXSize = nXSize;
double dfYSize = nYSize;
if( psExtraArg->bFloatingPointWindowValidity )
{
dfXOff = psExtraArg->dfXOff;
dfYOff = psExtraArg->dfYOff;
dfXSize = psExtraArg->dfXSize;
dfYSize = psExtraArg->dfYSize;
}
/* -------------------------------------------------------------------- */
/* Compute stepping increment. */
/* -------------------------------------------------------------------- */
const double dfSrcXInc = dfXSize / static_cast<double>( nBufXSize );
const double dfSrcYInc = dfYSize / static_cast<double>( nBufYSize );
CPLErr eErr = CE_None;
if (eRWFlag == GF_Write)
{
/* -------------------------------------------------------------------- */
/* Write case */
/* Loop over raster window computing source locations in the buffer. */
/* -------------------------------------------------------------------- */
GByte* pabyDstBlock = nullptr;
int nLBlockX = -1;
int nLBlockY = -1;
for( int iDstY = nYOff; iDstY < nYOff + nYSize; iDstY ++)
{
GPtrDiff_t iBufOffset = 0;
GPtrDiff_t iDstOffset = 0;
const int iBufYOff = static_cast<int>((iDstY - nYOff) / dfSrcYInc);
for( int iDstX = nXOff; iDstX < nXOff + nXSize; iDstX ++)
{
const int iBufXOff = static_cast<int>((iDstX - nXOff) / dfSrcXInc);
iBufOffset =
static_cast<GPtrDiff_t>(iBufYOff)
* static_cast<GPtrDiff_t>(nLineSpace)
+ iBufXOff * static_cast<GPtrDiff_t>(nPixelSpace);
// FIXME: this code likely doesn't work if the dirty block gets
// flushed to disk before being completely written.
// In the meantime, bJustInitialize should probably be set to
// FALSE even if it is not ideal performance wise, and for
// lossy compression.
/* -------------------------------------------------------------------- */
/* Ensure we have the appropriate block loaded. */
/* -------------------------------------------------------------------- */
if( iDstX < nLBlockX * nBlockXSize
|| iDstX - nBlockXSize >= nLBlockX * nBlockXSize
|| iDstY < nLBlockY * nBlockYSize
|| iDstY - nBlockYSize >= nLBlockY * nBlockYSize )
{
nLBlockX = iDstX / nBlockXSize;
nLBlockY = iDstY / nBlockYSize;
const bool bJustInitialize =
nYOff <= nLBlockY * nBlockYSize
&& nYOff + nYSize - nBlockYSize >= nLBlockY * nBlockYSize
&& nXOff <= nLBlockX * nBlockXSize
&& nXOff + nXSize - nBlockXSize >= nLBlockX * nBlockXSize;
/*bool bMemZeroBuffer = FALSE;
if( !bJustInitialize &&
nXOff <= nLBlockX * nBlockXSize &&
nYOff <= nLBlockY * nBlockYSize &&
(nXOff + nXSize >= (nLBlockX+1) * nBlockXSize ||
(nXOff + nXSize == GetXSize() &&
(nLBlockX+1) * nBlockXSize > GetXSize())) &&
(nYOff + nYSize >= (nLBlockY+1) * nBlockYSize ||
(nYOff + nYSize == GetYSize() &&
(nLBlockY+1) * nBlockYSize > GetYSize())) )
{
bJustInitialize = TRUE;
bMemZeroBuffer = TRUE;
}*/
if( poBlock != nullptr )
poBlock->DropLock();
poBlock = GetLockedBlockRef( nLBlockX, nLBlockY,
bJustInitialize );
if( poBlock == nullptr )
{
return( CE_Failure );
}
poBlock->MarkDirty();
pabyDstBlock = static_cast<GByte *>(poBlock->GetDataRef());
/*if( bMemZeroBuffer )
{
memset(pabyDstBlock, 0,
static_cast<GPtrDiff_t>(nBandDataSize) * nBlockXSize * nBlockYSize);
}*/
}
// To make Coverity happy. Should not happen by design.
if( pabyDstBlock == nullptr )
{
CPLAssert(false);
eErr = CE_Failure;
break;
}
/* -------------------------------------------------------------------- */
/* Copy over this pixel of data. */
/* -------------------------------------------------------------------- */
iDstOffset =
(static_cast<GPtrDiff_t>(iDstX)
- static_cast<GPtrDiff_t>(nLBlockX) * nBlockXSize
+ (static_cast<GPtrDiff_t>(iDstY)
- static_cast<GPtrDiff_t>(nLBlockY) * nBlockYSize)
* nBlockXSize )
* nBandDataSize;
if( eDataType == eBufType )
{
memcpy(
pabyDstBlock + iDstOffset,
static_cast<GByte *>(pData) + iBufOffset,
nBandDataSize );
}
else
{
/* type to type conversion ... ouch, this is expensive way
of handling single words */
GDALCopyWords(
static_cast<GByte *>(pData) + iBufOffset, eBufType, 0,
pabyDstBlock + iDstOffset, eDataType, 0,
1 );
}
}
if( psExtraArg->pfnProgress != nullptr &&
!psExtraArg->pfnProgress(1.0 * (iDstY - nYOff + 1) / nYSize, "",
psExtraArg->pProgressData) )
{
eErr = CE_Failure;
break;
}
}
}
else
{
if( psExtraArg->eResampleAlg != GRIORA_NearestNeighbour )
{
if( (psExtraArg->eResampleAlg == GRIORA_Cubic ||
psExtraArg->eResampleAlg == GRIORA_CubicSpline ||
psExtraArg->eResampleAlg == GRIORA_Bilinear ||
psExtraArg->eResampleAlg == GRIORA_Lanczos) &&
GetColorTable() != nullptr )
{
CPLError(CE_Warning, CPLE_NotSupported,
"Resampling method not supported on paletted band. "
"Falling back to nearest neighbour");
}
else if( psExtraArg->eResampleAlg == GRIORA_Gauss &&
GDALDataTypeIsComplex( eDataType ) )
{
CPLError(
CE_Warning, CPLE_NotSupported,
"Resampling method not supported on complex data type "
"band. Falling back to nearest neighbour");
}
else
{
return RasterIOResampled( eRWFlag,
nXOff, nYOff, nXSize, nYSize,
pData, nBufXSize, nBufYSize,
eBufType,
nPixelSpace, nLineSpace,
psExtraArg );
}
}
int nLimitBlockY = 0;
const bool bByteCopy = eDataType == eBufType && nBandDataSize == 1;
int nStartBlockX = -nBlockXSize;
const double EPS = 1e-10;
int nLBlockY = -1;
const double dfSrcXStart = 0.5 * dfSrcXInc + dfXOff + EPS;
const bool bIntegerXFactor = bUseIntegerRequestCoords &&
static_cast<int>(dfSrcXInc) == dfSrcXInc &&
static_cast<int>(dfSrcXInc) < INT_MAX / nBandDataSize;
/* -------------------------------------------------------------------- */
/* Read case */
/* Loop over buffer computing source locations. */
/* -------------------------------------------------------------------- */
for( int iBufYOff = 0; iBufYOff < nBufYSize; iBufYOff++ )
{
// Add small epsilon to avoid some numeric precision issues.
const double dfSrcY = (iBufYOff+0.5) * dfSrcYInc + dfYOff + EPS;
const int iSrcY = static_cast<int>(std::min(std::max(0.0, dfSrcY),
static_cast<double>(nRasterYSize - 1)));
GPtrDiff_t iBufOffset =
static_cast<GPtrDiff_t>(iBufYOff)
* static_cast<GPtrDiff_t>(nLineSpace);
if( iSrcY >= nLimitBlockY )
{
nLBlockY = iSrcY / nBlockYSize;
nLimitBlockY = nLBlockY * nBlockYSize;
if( nLimitBlockY < INT_MAX - nBlockYSize )
nLimitBlockY += nBlockYSize;
else
nLimitBlockY = INT_MAX;
// Make sure a new block is loaded.
nStartBlockX = -nBlockXSize;
}
else if( static_cast<int>(dfSrcXStart) < nStartBlockX )
{
// Make sure a new block is loaded.
nStartBlockX = -nBlockXSize;
}
GPtrDiff_t iSrcOffsetCst =
(iSrcY - nLBlockY*nBlockYSize)
* static_cast<GPtrDiff_t>(nBlockXSize);
if( bIntegerXFactor )
{
int iSrcX = static_cast<int>(dfSrcXStart);
const int nSrcXInc = static_cast<int>(dfSrcXInc);
GByte* pabyDstData= static_cast<GByte*>(pData) + iBufOffset;
bool bRet = false;
if( bByteCopy )
{
bRet = DownsamplingIntegerXFactor<true, 1>(this, iSrcX, nSrcXInc,
iSrcOffsetCst,
pabyDstData,
static_cast<int>(nPixelSpace),
nBufXSize,
GDT_Byte, GDT_Byte,
nStartBlockX, nBlockXSize, poBlock, nLBlockY);
}
else if( eDataType == eBufType )
{
switch( nBandDataSize )
{
case 2:
bRet = DownsamplingIntegerXFactor<true, 2>(this, iSrcX, nSrcXInc,
iSrcOffsetCst,
pabyDstData,
static_cast<int>(nPixelSpace),
nBufXSize,
eDataType, eDataType,
nStartBlockX, nBlockXSize, poBlock, nLBlockY);
break;
case 4:
bRet = DownsamplingIntegerXFactor<true, 4>(this, iSrcX, nSrcXInc,
iSrcOffsetCst,
pabyDstData,
static_cast<int>(nPixelSpace),
nBufXSize,
eDataType, eDataType,
nStartBlockX, nBlockXSize, poBlock, nLBlockY);
break;
case 8:
bRet = DownsamplingIntegerXFactor<true, 8>(this, iSrcX, nSrcXInc,
iSrcOffsetCst,
pabyDstData,
static_cast<int>(nPixelSpace),
nBufXSize,
eDataType, eDataType,
nStartBlockX, nBlockXSize, poBlock, nLBlockY);
break;
case 16:
bRet = DownsamplingIntegerXFactor<true, 16>(this, iSrcX, nSrcXInc,
iSrcOffsetCst,
pabyDstData,
static_cast<int>(nPixelSpace),
nBufXSize,
eDataType, eDataType,
nStartBlockX, nBlockXSize, poBlock, nLBlockY);
break;
default:
CPLAssert(false);
break;
}
}
else
{
bRet = DownsamplingIntegerXFactor<false, 0>(this, iSrcX, nSrcXInc,
iSrcOffsetCst,
pabyDstData,
static_cast<int>(nPixelSpace),
nBufXSize,
eDataType, eBufType,
nStartBlockX, nBlockXSize, poBlock, nLBlockY);
}
if( !bRet )
eErr = CE_Failure;
}
else
{
double dfSrcX = dfSrcXStart;
for( int iBufXOff = 0;
iBufXOff < nBufXSize;
iBufXOff++, dfSrcX += dfSrcXInc )
{
// TODO?: try to avoid the clamping for most iterations
const int iSrcX = static_cast<int>(std::min(std::max(0.0, dfSrcX),
static_cast<double>(nRasterXSize - 1)));
/* -------------------------------------------------------------------- */
/* Ensure we have the appropriate block loaded. */
/* -------------------------------------------------------------------- */
if( iSrcX >= nBlockXSize + nStartBlockX )
{
const int nLBlockX = iSrcX / nBlockXSize;
nStartBlockX = nLBlockX * nBlockXSize;
if( poBlock != nullptr )
poBlock->DropLock();
poBlock = GetLockedBlockRef( nLBlockX, nLBlockY, FALSE );
if( poBlock == nullptr )
{
eErr = CE_Failure;
break;
}
pabySrcBlock = static_cast<GByte *>(poBlock->GetDataRef());
}
const GPtrDiff_t nDiffX = static_cast<GPtrDiff_t>(iSrcX - nStartBlockX);
/* -------------------------------------------------------------------- */
/* Copy over this pixel of data. */
/* -------------------------------------------------------------------- */
if( bByteCopy )
{
GPtrDiff_t iSrcOffset = nDiffX + iSrcOffsetCst;
static_cast<GByte *>(pData)[iBufOffset] =
pabySrcBlock[iSrcOffset];
}
else if( eDataType == eBufType )
{
GPtrDiff_t iSrcOffset =
(nDiffX + iSrcOffsetCst)
* nBandDataSize;
memcpy( static_cast<GByte *>(pData) + iBufOffset,
pabySrcBlock + iSrcOffset, nBandDataSize );
}
else
{
// Type to type conversion ...
GPtrDiff_t iSrcOffset =
(nDiffX + iSrcOffsetCst)
* nBandDataSize;
GDALCopyWords(
pabySrcBlock + iSrcOffset, eDataType, 0,
static_cast<GByte *>(pData) + iBufOffset, eBufType, 0,
1 );
}
iBufOffset += static_cast<int>(nPixelSpace);
}
}
if( eErr == CE_Failure )
break;
if( psExtraArg->pfnProgress != nullptr &&
!psExtraArg->pfnProgress(1.0 * (iBufYOff + 1) / nBufYSize, "",
psExtraArg->pProgressData) )
{
eErr = CE_Failure;
break;
}
}
}
if( poBlock != nullptr )
poBlock->DropLock();
return eErr;
}
/************************************************************************/
/* GDALRasterIOTransformer() */
/************************************************************************/
struct GDALRasterIOTransformerStruct
{
double dfXOff;
double dfYOff;
double dfXRatioDstToSrc;
double dfYRatioDstToSrc;
};
static int GDALRasterIOTransformer( void *pTransformerArg,
int bDstToSrc,
int nPointCount,
double *x, double *y, double * /* z */,
int *panSuccess )
{
GDALRasterIOTransformerStruct* psParams =
static_cast<GDALRasterIOTransformerStruct *>( pTransformerArg );
if( bDstToSrc )
{
for(int i = 0; i < nPointCount; i++)
{
x[i] = x[i] * psParams->dfXRatioDstToSrc + psParams->dfXOff;
y[i] = y[i] * psParams->dfYRatioDstToSrc + psParams->dfYOff;