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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>
*
* SPDX-License-Identifier: MIT
****************************************************************************/
#include "cpl_port.h"
#include "gdal.h"
#include "gdal_priv.h"
#include <cassert>
#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"
#if defined(__x86_64) || defined(_M_X64)
#include <emmintrin.h>
#define HAVE_SSE2
#elif defined(USE_NEON_OPTIMIZATIONS)
#include "include_sse2neon.h"
#define HAVE_SSE2
#endif
#ifdef HAVE_SSSE3_AT_COMPILE_TIME
#include "rasterio_ssse3.h"
#ifdef __SSSE3__
#include <tmmintrin.h>
#endif
#endif
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 ...
GDALCopyWords64(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)
GDALCopyWords64(
pabySrcBlock + nSrcByteOffset, eDataType, nBandDataSize,
static_cast<GByte *>(pData) +
static_cast<GPtrDiff_t>(iBufYOff) * nLineSpace,
eBufType, static_cast<int>(nPixelSpace), nBufXSize);
else
GDALCopyWords64(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 iBufOffset = static_cast<GPtrDiff_t>(iBufYOff) *
static_cast<GPtrDiff_t>(nLineSpace);
int nLBlockY = iSrcY / nBlockYSize;
int nLBlockX = nLBlockXStart;
int iSrcX = nXOff;
while (iSrcX < nXSpanEnd)
{
int 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 ||
// cppcheck-suppress knownConditionTrueFalse
(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. */
/* --------------------------------------------------------------------
*/
GPtrDiff_t 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)
GDALCopyWords64(
pabySrcBlock + iSrcOffset, eDataType,
nBandDataSize,
static_cast<GByte *>(pData) + iBufOffset +
static_cast<GPtrDiff_t>(k) * nLineSpace,
eBufType, static_cast<int>(nPixelSpace),
nXSpan);
else
GDALCopyWords64(
static_cast<GByte *>(pData) + iBufOffset +
static_cast<GPtrDiff_t>(k) * nLineSpace,
eBufType, static_cast<int>(nPixelSpace),
pabySrcBlock + iSrcOffset, eDataType,
nBandDataSize, nXSpan);
}
iSrcOffset +=
static_cast<GPtrDiff_t>(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++)
{
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);
GPtrDiff_t 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. */
/* --------------------------------------------------------------------
*/
GPtrDiff_t 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 */
GDALCopyWords64(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;
GDALCopyWords64(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;
panSuccess[i] = TRUE;
}
}
else
{
for (int i = 0; i < nPointCount; i++)
{
x[i] = (x[i] - psParams->dfXOff) / psParams->dfXRatioDstToSrc;
y[i] = (y[i] - psParams->dfYOff) / psParams->dfYRatioDstToSrc;
panSuccess[i] = TRUE;
}
}
return TRUE;
}
/************************************************************************/
/* RasterIOResampled() */
/************************************************************************/