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gdaltransformer.cpp
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gdaltransformer.cpp
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/******************************************************************************
*
* Project: Mapinfo Image Warper
* Purpose: Implementation of one or more GDALTrasformerFunc types, including
* the GenImgProj (general image reprojector) transformer.
* Author: Frank Warmerdam, warmerdam@pobox.com
*
******************************************************************************
* Copyright (c) 2002, i3 - information integration and imaging
* Fort Collin, CO
* Copyright (c) 2008-2013, Even Rouault <even dot rouault at spatialys.com>
* Copyright (c) 2021, CLS
*
* 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_alg.h"
#include "gdal_alg_priv.h"
#include <climits>
#include <cmath>
#include <cstddef>
#include <cstdlib>
#include <cstring>
#include <algorithm>
#include <limits>
#include <utility>
#include "cpl_conv.h"
#include "cpl_error.h"
#include "cpl_list.h"
#include "cpl_minixml.h"
#include "cpl_multiproc.h"
#include "cpl_string.h"
#include "cpl_vsi.h"
#include "gdal.h"
#include "gdal_priv.h"
#include "ogr_core.h"
#include "ogr_spatialref.h"
#include "ogr_srs_api.h"
CPL_CVSID("$Id$")
CPL_C_START
void *GDALDeserializeGCPTransformer( CPLXMLNode *psTree );
void *GDALDeserializeTPSTransformer( CPLXMLNode *psTree );
void *GDALDeserializeGeoLocTransformer( CPLXMLNode *psTree );
void *GDALDeserializeRPCTransformer( CPLXMLNode *psTree );
CPL_C_END
static CPLXMLNode *GDALSerializeReprojectionTransformer( void *pTransformArg );
static void *GDALDeserializeReprojectionTransformer( CPLXMLNode *psTree );
static CPLXMLNode *GDALSerializeGenImgProjTransformer( void *pTransformArg );
static void *GDALDeserializeGenImgProjTransformer( CPLXMLNode *psTree );
static void *
GDALCreateApproxTransformer2( GDALTransformerFunc pfnRawTransformer,
void *pRawTransformerArg,
double dfMaxErrorForward,
double dfMaxErrorReverse );
/************************************************************************/
/* ==================================================================== */
/* GDALGenImgProjTransformer */
/* ==================================================================== */
/************************************************************************/
typedef struct {
GDALTransformerInfo sTI;
double adfSrcGeoTransform[6];
double adfSrcInvGeoTransform[6];
void *pSrcTransformArg;
GDALTransformerFunc pSrcTransformer;
void *pReprojectArg;
GDALTransformerFunc pReproject;
double adfDstGeoTransform[6];
double adfDstInvGeoTransform[6];
void *pDstTransformArg;
GDALTransformerFunc pDstTransformer;
// Memorize the value of the CHECK_WITH_INVERT_PROJ at the time we
// instantiated the object, to be able to decide if
// GDALRefreshGenImgProjTransformer() must do something or not.
bool bCheckWithInvertPROJ;
} GDALGenImgProjTransformInfo;
/************************************************************************/
/* ==================================================================== */
/* GDALReprojectionTransformer */
/* ==================================================================== */
/************************************************************************/
struct GDALReprojectionTransformInfo
{
GDALTransformerInfo sTI;
char** papszOptions = nullptr;
double dfTime = 0.0;
OGRCoordinateTransformation *poForwardTransform = nullptr;
OGRCoordinateTransformation *poReverseTransform = nullptr;
GDALReprojectionTransformInfo(): sTI()
{
memset(&sTI, 0, sizeof(sTI));
}
GDALReprojectionTransformInfo(const GDALReprojectionTransformInfo&) = delete;
GDALReprojectionTransformInfo& operator= (const GDALReprojectionTransformInfo&) = delete;
};
/************************************************************************/
/* GDALTransformFunc */
/* */
/* Documentation for GDALTransformFunc typedef. */
/************************************************************************/
/*!
\typedef typedef int (*GDALTransformerFunc)( void *pTransformerArg, int bDstToSrc, int nPointCount, double *x, double *y, double *z, int *panSuccess );
Generic signature for spatial point transformers.
This function signature is used for a variety of functions that accept
passed in functions used to transform point locations between two coordinate
spaces.
The GDALCreateGenImgProjTransformer(), GDALCreateReprojectionTransformerEx(),
GDALCreateGCPTransformer() and GDALCreateApproxTransformer() functions can
be used to prepare argument data for some built-in transformers. As well,
applications can implement their own transformers to the following signature.
\code
typedef int
(*GDALTransformerFunc)( void *pTransformerArg,
int bDstToSrc, int nPointCount,
double *x, double *y, double *z, int *panSuccess );
\endcode
@param pTransformerArg application supplied callback data used by the
transformer.
@param bDstToSrc if TRUE the transformation will be from the destination
coordinate space to the source coordinate system, otherwise the transformation
will be from the source coordinate system to the destination coordinate system.
@param nPointCount number of points in the x, y and z arrays.
@param x input X coordinates. Results returned in same array.
@param y input Y coordinates. Results returned in same array.
@param z input Z coordinates. Results returned in same array.
@param panSuccess array of ints in which success (TRUE) or failure (FALSE)
flags are returned for the translation of each point.
@return TRUE if the overall transformation succeeds (though some individual
points may have failed) or FALSE if the overall transformation fails.
*/
/************************************************************************/
/* GDALSuggestedWarpOutput() */
/************************************************************************/
/**
* Suggest output file size.
*
* This function is used to suggest the size, and georeferenced extents
* appropriate given the indicated transformation and input file. It walks
* the edges of the input file (approximately 20 sample points along each
* edge) transforming into output coordinates in order to get an extents box.
*
* Then a resolution is computed with the intent that the length of the
* distance from the top left corner of the output imagery to the bottom right
* corner would represent the same number of pixels as in the source image.
* Note that if the image is somewhat rotated the diagonal taken isn't of the
* whole output bounding rectangle, but instead of the locations where the
* top/left and bottom/right corners transform. The output pixel size is
* always square. This is intended to approximately preserve the resolution
* of the input data in the output file.
*
* The values returned in padfGeoTransformOut, pnPixels and pnLines are
* the suggested number of pixels and lines for the output file, and the
* geotransform relating those pixels to the output georeferenced coordinates.
*
* The trickiest part of using the function is ensuring that the
* transformer created is from source file pixel/line coordinates to
* output file georeferenced coordinates. This can be accomplished with
* GDALCreateGenImgProjTransformer() by passing a NULL for the hDstDS.
*
* @param hSrcDS the input image (it is assumed the whole input images is
* being transformed).
* @param pfnTransformer the transformer function.
* @param pTransformArg the callback data for the transformer function.
* @param padfGeoTransformOut the array of six doubles in which the suggested
* geotransform is returned.
* @param pnPixels int in which the suggest pixel width of output is returned.
* @param pnLines int in which the suggest pixel height of output is returned.
*
* @return CE_None if successful or CE_Failure otherwise.
*/
CPLErr CPL_STDCALL
GDALSuggestedWarpOutput( GDALDatasetH hSrcDS,
GDALTransformerFunc pfnTransformer,
void *pTransformArg,
double *padfGeoTransformOut,
int *pnPixels, int *pnLines )
{
VALIDATE_POINTER1( hSrcDS, "GDALSuggestedWarpOutput", CE_Failure );
double adfExtent[4] = {};
return GDALSuggestedWarpOutput2( hSrcDS, pfnTransformer, pTransformArg,
padfGeoTransformOut, pnPixels, pnLines,
adfExtent, 0 );
}
static int GDALSuggestedWarpOutput2_MustAdjustForRightBorder(
GDALTransformerFunc pfnTransformer, void *pTransformArg,
double* padfExtent,
CPL_UNUSED int nPixels,
int nLines,
double dfPixelSizeX, double dfPixelSizeY )
{
double adfX[21] = {};
double adfY[21] = {};
const double dfMaxXOut = padfExtent[2];
const double dfMaxYOut = padfExtent[3];
// Take 20 steps.
int nSamplePoints = 0;
for( double dfRatio = 0.0; dfRatio <= 1.01; dfRatio += 0.05 )
{
// Ensure we end exactly at the end.
if( dfRatio > 0.99 )
dfRatio = 1.0;
// Along right.
adfX[nSamplePoints] = dfMaxXOut;
adfY[nSamplePoints] = dfMaxYOut - dfPixelSizeY * dfRatio * nLines;
nSamplePoints++;
}
double adfZ[21] = {};
int abSuccess[21] = {};
bool bErr = false;
if( !pfnTransformer( pTransformArg, TRUE, nSamplePoints,
adfX, adfY, adfZ, abSuccess ) )
{
bErr = true;
}
if( !bErr && !pfnTransformer( pTransformArg, FALSE, nSamplePoints,
adfX, adfY, adfZ, abSuccess ) )
{
bErr = true;
}
nSamplePoints = 0;
int nBadCount = 0;
for( double dfRatio = 0.0; !bErr && dfRatio <= 1.01; dfRatio += 0.05 )
{
const double expected_x = dfMaxXOut;
const double expected_y = dfMaxYOut - dfPixelSizeY * dfRatio * nLines;
if( fabs(adfX[nSamplePoints] - expected_x) > dfPixelSizeX ||
fabs(adfY[nSamplePoints] - expected_y) > dfPixelSizeY )
nBadCount++;
nSamplePoints++;
}
return nBadCount == nSamplePoints;
}
static int GDALSuggestedWarpOutput2_MustAdjustForBottomBorder(
GDALTransformerFunc pfnTransformer, void *pTransformArg,
double* padfExtent, int nPixels,
CPL_UNUSED int nLines,
double dfPixelSizeX, double dfPixelSizeY)
{
double adfX[21] = {};
double adfY[21] = {};
const double dfMinXOut = padfExtent[0];
const double dfMinYOut = padfExtent[1];
// Take 20 steps.
int nSamplePoints = 0;
for( double dfRatio = 0.0; dfRatio <= 1.01; dfRatio += 0.05 )
{
// Ensure we end exactly at the end.
if( dfRatio > 0.99 )
dfRatio = 1.0;
// Along right.
adfX[nSamplePoints] = dfMinXOut + dfPixelSizeX * dfRatio * nPixels;
adfY[nSamplePoints] = dfMinYOut;
nSamplePoints++;
}
double adfZ[21] = {};
int abSuccess[21] = {};
bool bErr = false;
if( !pfnTransformer( pTransformArg, TRUE, nSamplePoints,
adfX, adfY, adfZ, abSuccess ) )
{
bErr = true;
}
if( !bErr && !pfnTransformer( pTransformArg, FALSE, nSamplePoints,
adfX, adfY, adfZ, abSuccess ) )
{
bErr = true;
}
nSamplePoints = 0;
int nBadCount = 0;
for( double dfRatio = 0.0; !bErr && dfRatio <= 1.01; dfRatio += 0.05 )
{
const double expected_x = dfMinXOut + dfPixelSizeX * dfRatio * nPixels;
const double expected_y = dfMinYOut;
if( fabs(adfX[nSamplePoints] - expected_x) > dfPixelSizeX ||
fabs(adfY[nSamplePoints] - expected_y) > dfPixelSizeY )
nBadCount++;
nSamplePoints++;
}
return nBadCount == nSamplePoints;
}
/************************************************************************/
/* GDALSuggestedWarpOutput2() */
/************************************************************************/
/**
* Suggest output file size.
*
* This function is used to suggest the size, and georeferenced extents
* appropriate given the indicated transformation and input file. It walks
* the edges of the input file (approximately 20 sample points along each
* edge) transforming into output coordinates in order to get an extents box.
*
* Then a resolution is computed with the intent that the length of the
* distance from the top left corner of the output imagery to the bottom right
* corner would represent the same number of pixels as in the source image.
* Note that if the image is somewhat rotated the diagonal taken isn't of the
* whole output bounding rectangle, but instead of the locations where the
* top/left and bottom/right corners transform. The output pixel size is
* always square. This is intended to approximately preserve the resolution
* of the input data in the output file.
*
* The values returned in padfGeoTransformOut, pnPixels and pnLines are
* the suggested number of pixels and lines for the output file, and the
* geotransform relating those pixels to the output georeferenced coordinates.
*
* The trickiest part of using the function is ensuring that the
* transformer created is from source file pixel/line coordinates to
* output file georeferenced coordinates. This can be accomplished with
* GDALCreateGenImgProjTransformer() by passing a NULL for the hDstDS.
*
* @param hSrcDS the input image (it is assumed the whole input images is
* being transformed).
* @param pfnTransformer the transformer function.
* @param pTransformArg the callback data for the transformer function.
* @param padfGeoTransformOut the array of six doubles in which the suggested
* geotransform is returned.
* @param pnPixels int in which the suggest pixel width of output is returned.
* @param pnLines int in which the suggest pixel height of output is returned.
* @param padfExtent Four entry array to return extents as (xmin, ymin, xmax,
* ymax).
* @param nOptions Options. Zero or GDAL_SWO_ROUND_UP_SIZE to ask *pnPixels
* and *pnLines to be rounded up instead of being rounded to the closes integer.
*
* @return CE_None if successful or CE_Failure otherwise.
*/
CPLErr CPL_STDCALL
GDALSuggestedWarpOutput2( GDALDatasetH hSrcDS,
GDALTransformerFunc pfnTransformer,
void *pTransformArg,
double *padfGeoTransformOut,
int *pnPixels, int *pnLines,
double *padfExtent,
int nOptions )
{
VALIDATE_POINTER1( hSrcDS, "GDALSuggestedWarpOutput2", CE_Failure );
/* -------------------------------------------------------------------- */
/* Setup sample points all around the edge of the input raster. */
/* -------------------------------------------------------------------- */
if( pfnTransformer == GDALGenImgProjTransform )
{
// In case CHECK_WITH_INVERT_PROJ has been modified.
GDALRefreshGenImgProjTransformer(pTransformArg);
}
else if( pfnTransformer == GDALApproxTransform )
{
// In case CHECK_WITH_INVERT_PROJ has been modified.
GDALRefreshApproxTransformer(pTransformArg);
}
const int nInXSize = GDALGetRasterXSize( hSrcDS );
const int nInYSize = GDALGetRasterYSize( hSrcDS );
const int N_PIXELSTEP = 50;
int nSteps = static_cast<int>(
static_cast<double>(std::min(nInYSize, nInXSize)) / N_PIXELSTEP + 0.5);
if( nSteps < 20 )
nSteps = 20;
else if( nSteps > 100 )
nSteps = 100;
// TODO(rouault): How is this goto retry supposed to work? Added in r20537.
// Does redoing the same malloc multiple times work? If it is needed, can
// it be converted to a tigher while loop around the MALLOC3s and free? Is
// the point to try with the full requested steps. Then, if there is not
// enough memory, back off and try with just 20 steps?
retry:
int nStepsPlusOne = nSteps + 1;
int nSampleMax = nStepsPlusOne*nStepsPlusOne;
double dfStep = 1.0 / nSteps;
double *padfY = nullptr;
double *padfZ = nullptr;
double *padfYRevert = nullptr;
double *padfZRevert = nullptr;
int* pabSuccess = static_cast<int *>(
VSI_MALLOC3_VERBOSE(sizeof(int), nStepsPlusOne, nStepsPlusOne));
double* padfX = static_cast<double *>(
VSI_MALLOC3_VERBOSE(sizeof(double) * 3, nStepsPlusOne, nStepsPlusOne));
double* padfXRevert = static_cast<double *>(
VSI_MALLOC3_VERBOSE(sizeof(double) * 3, nStepsPlusOne, nStepsPlusOne));
if( pabSuccess == nullptr || padfX == nullptr || padfXRevert == nullptr )
{
CPLFree( padfX );
CPLFree( padfXRevert );
CPLFree( pabSuccess );
if( nSteps > 20 )
{
nSteps = 20;
goto retry;
}
return CE_Failure;
}
padfY = padfX + nSampleMax;
padfZ = padfX + nSampleMax * 2;
padfYRevert = padfXRevert + nSampleMax;
padfZRevert = padfXRevert + nSampleMax * 2;
// Take N_STEPS steps.
for( int iStep = 0; iStep <= nSteps; iStep++ )
{
double dfRatio = (iStep == nSteps) ? 1.0 : iStep * dfStep;
int iStep2 = iStep;
// Along top.
padfX[iStep2] = dfRatio * nInXSize;
padfY[iStep2] = 0.0;
padfZ[iStep2] = 0.0;
// Along bottom.
iStep2 += nStepsPlusOne;
padfX[iStep2] = dfRatio * nInXSize;
padfY[iStep2] = nInYSize;
padfZ[iStep2] = 0.0;
// Along left.
iStep2 += nStepsPlusOne;
padfX[iStep2] = 0.0;
padfY[iStep2] = dfRatio * nInYSize;
padfZ[iStep2] = 0.0;
// Along right.
iStep2 += nStepsPlusOne;
padfX[iStep2] = nInXSize;
padfY[iStep2] = dfRatio * nInYSize;
padfZ[iStep2] = 0.0;
}
int nSamplePoints = 4 * nStepsPlusOne;
memset( pabSuccess, 1, sizeof(int) * nSampleMax );
/* -------------------------------------------------------------------- */
/* Transform them to the output coordinate system. */
/* -------------------------------------------------------------------- */
if( !pfnTransformer( pTransformArg, FALSE, nSamplePoints,
padfX, padfY, padfZ, pabSuccess ) )
{
CPLError( CE_Failure, CPLE_AppDefined,
"GDALSuggestedWarpOutput() failed because the passed "
"transformer failed." );
CPLFree( padfX );
CPLFree( padfXRevert );
CPLFree( pabSuccess );
return CE_Failure;
}
constexpr int SIGN_FINAL_UNINIT = -2;
constexpr int SIGN_FINAL_INVALID = 0;
int iSignDiscontinuity = SIGN_FINAL_UNINIT;
int nFailedCount = 0;
const int iSignArray[2] = {-1, 1};
for( int i = 0; i < nSamplePoints; i++ )
{
if( pabSuccess[i] )
{
// Fix for https://trac.osgeo.org/gdal/ticket/7243
// where echo "-2050000.000 2050000.000" |
// gdaltransform -s_srs EPSG:3411 -t_srs EPSG:4326
// gives "-180 63.691332898492"
// but we would rather like 180
if( iSignDiscontinuity == 1 || iSignDiscontinuity == -1 )
{
if( !((iSignDiscontinuity * padfX[i] > 0 &&
iSignDiscontinuity * padfX[i] <= 180.0) ||
(fabs(padfX[i] - iSignDiscontinuity * -180.0) < 1e-8) ) )
{
iSignDiscontinuity = SIGN_FINAL_INVALID;
}
}
else if( iSignDiscontinuity == SIGN_FINAL_UNINIT )
{
for( const auto& iSign : iSignArray )
{
if( (iSign * padfX[i] > 0 && iSign * padfX[i] <= 180.0) ||
(fabs(padfX[i] - iSign * -180.0) < 1e-8) )
{
iSignDiscontinuity = iSign;
break;
}
}
if( iSignDiscontinuity == SIGN_FINAL_UNINIT )
{
iSignDiscontinuity = SIGN_FINAL_INVALID;
}
}
}
else
{
nFailedCount++;
}
}
if( iSignDiscontinuity == 1 || iSignDiscontinuity == -1 )
{
for( int i = 0; i < nSamplePoints; i++ )
{
if( pabSuccess[i] )
{
if( fabs(padfX[i] - iSignDiscontinuity * -180.0) < 1e-8 )
{
double axTemp[2] = { iSignDiscontinuity * -180.0,
iSignDiscontinuity * 180.0 };
double ayTemp[2] = { padfY[i], padfY[i] };
double azTemp[2] = { padfZ[i], padfZ[i] };
int abSuccess[2] = {FALSE, FALSE};
if( pfnTransformer(pTransformArg, TRUE, 2,
axTemp, ayTemp, azTemp, abSuccess) &&
fabs(axTemp[0] - axTemp[1]) < 1e-8 &&
fabs(ayTemp[0] - ayTemp[1]) < 1e-8 )
{
padfX[i] = iSignDiscontinuity * 180.0;
}
}
}
}
}
/* -------------------------------------------------------------------- */
/* Check if the computed target coordinates are revertable. */
/* If not, try the detailed grid sampling. */
/* -------------------------------------------------------------------- */
if( nFailedCount )
{
CPLDebug("WARP", "At least one point failed after direct transform");
}
else
{
memcpy(padfXRevert, padfX, nSamplePoints * sizeof(double));
memcpy(padfYRevert, padfY, nSamplePoints * sizeof(double));
memcpy(padfZRevert, padfZ, nSamplePoints * sizeof(double));
if( pfnTransformer(pTransformArg, TRUE, nSamplePoints,
padfXRevert, padfYRevert, padfZRevert, pabSuccess) )
{
for( int i = 0; nFailedCount == 0 && i < nSamplePoints; i++ )
{
if( !pabSuccess[i] )
{
nFailedCount++;
break;
}
double dfRatio = (i % nStepsPlusOne) * dfStep;
if( dfRatio > 0.99 )
dfRatio = 1.0;
double dfExpectedX = 0.0;
double dfExpectedY = 0.0;
if( i < nStepsPlusOne )
{
dfExpectedX = dfRatio * nInXSize;
}
else if( i < 2 * nStepsPlusOne )
{
dfExpectedX = dfRatio * nInXSize;
dfExpectedY = nInYSize;
}
else if( i < 3 * nStepsPlusOne )
{
dfExpectedY = dfRatio * nInYSize;
}
else
{
dfExpectedX = nInXSize;
dfExpectedY = dfRatio * nInYSize;
}
if( fabs(padfXRevert[i] - dfExpectedX) > nInXSize /
static_cast<double>(nSteps) ||
fabs(padfYRevert[i] - dfExpectedY) > nInYSize /
static_cast<double>(nSteps) )
nFailedCount++;
}
if( nFailedCount != 0 )
CPLDebug("WARP",
"At least one point failed after revert transform");
}
else
{
nFailedCount = 1;
}
}
/* -------------------------------------------------------------------- */
/* If any of the edge points failed to transform, we need to */
/* build a fairly detailed internal grid of points instead to */
/* help identify the area that is transformable. */
/* -------------------------------------------------------------------- */
if( nFailedCount )
{
nSamplePoints = 0;
// Take N_STEPS steps.
for( int iStep = 0; iStep <= nSteps; iStep++ )
{
double dfRatio = (iStep == nSteps) ? 1.0 : iStep * dfStep;
for( int iStep2 = 0; iStep2 <= nSteps; iStep2++ )
{
const double dfRatio2 =
iStep2 == nSteps ? 1.0 : iStep2 * dfStep;
// From top to bottom, from left to right.
padfX[nSamplePoints] = dfRatio2 * nInXSize;
padfY[nSamplePoints] = dfRatio * nInYSize;
padfZ[nSamplePoints] = 0.0;
nSamplePoints++;
}
}
CPLAssert( nSamplePoints == nSampleMax );
if( !pfnTransformer( pTransformArg, FALSE, nSamplePoints,
padfX, padfY, padfZ, pabSuccess ) )
{
CPLError(CE_Failure, CPLE_AppDefined,
"GDALSuggestedWarpOutput() failed because the passed"
"transformer failed.");
CPLFree( padfX );
CPLFree( padfXRevert );
CPLFree( pabSuccess );
return CE_Failure;
}
}
/* -------------------------------------------------------------------- */
/* Collect the bounds, ignoring any failed points. */
/* -------------------------------------------------------------------- */
double dfMinXOut = 0.0;
double dfMinYOut = 0.0;
double dfMaxXOut = 0.0;
double dfMaxYOut = 0.0;
bool bGotInitialPoint = false;
nFailedCount = 0;
for( int i = 0; i < nSamplePoints; i++ )
{
int x_i = 0;
int y_i = 0;
if( nSamplePoints == nSampleMax )
{
x_i = i % nStepsPlusOne;
y_i = i / nStepsPlusOne;
}
else
{
if( i < 2 * nStepsPlusOne )
{
x_i = i % nStepsPlusOne;
y_i = (i < nStepsPlusOne) ? 0 : nSteps;
}
}
if( x_i > 0 && (pabSuccess[i-1] || pabSuccess[i]) )
{
double x_out_before = padfX[i-1];
double x_out_after = padfX[i];
int nIter = 0;
double x_in_before =
static_cast<double>(x_i - 1) * nInXSize / nSteps;
double x_in_after =
static_cast<double>(x_i) * nInXSize / nSteps;
int invalid_before = !(pabSuccess[i-1]);
int invalid_after = !(pabSuccess[i]);
// Detect discontinuity in target coordinates when the target x
// coordinates change sign. This may be a false positive when the
// target tx is around 0 Dichotomic search to reduce the interval
// to near the discontinuity and get a better out extent.
while( (invalid_before || invalid_after ||
x_out_before * x_out_after < 0.0) && nIter < 16 )
{
double x = (x_in_before + x_in_after) / 2.0;
double y = static_cast<double>(y_i) * nInYSize / nSteps;
double z = 0.0;
int bSuccess = TRUE;
if( pfnTransformer( pTransformArg, FALSE, 1,
&x, &y, &z, &bSuccess ) && bSuccess )
{
if( bGotInitialPoint )
{
dfMinXOut = std::min(dfMinXOut, x);
dfMinYOut = std::min(dfMinYOut, y);
dfMaxXOut = std::max(dfMaxXOut, x);
dfMaxYOut = std::max(dfMaxYOut, y);
}
else
{
bGotInitialPoint = true;
dfMinXOut = x;
dfMaxXOut = x;
dfMinYOut = y;
dfMaxYOut = y;
}
if( invalid_before || x_out_before * x < 0 )
{
invalid_after = FALSE;
x_in_after = (x_in_before + x_in_after) / 2.0;
x_out_after = x;
}
else
{
invalid_before = FALSE;
x_out_before = x;
x_in_before = (x_in_before + x_in_after) / 2.0;
}
}
else
{
if( invalid_before )
{
x_in_before = (x_in_before + x_in_after) / 2.0;
}
else if( invalid_after )
{
x_in_after = (x_in_before + x_in_after) / 2.0;
}
else
{
break;
}
}
nIter++;
}
}
if( !pabSuccess[i] )
{
nFailedCount++;
continue;
}
if( bGotInitialPoint )
{
dfMinXOut = std::min(dfMinXOut, padfX[i]);
dfMinYOut = std::min(dfMinYOut, padfY[i]);
dfMaxXOut = std::max(dfMaxXOut, padfX[i]);
dfMaxYOut = std::max(dfMaxYOut, padfY[i]);
}
else
{
bGotInitialPoint = true;
dfMinXOut = padfX[i];
dfMaxXOut = padfX[i];
dfMinYOut = padfY[i];
dfMaxYOut = padfY[i];
}
}
if( nFailedCount > nSamplePoints - 10 )
{
CPLError(CE_Failure, CPLE_AppDefined,
"Too many points (%d out of %d) failed to transform, "
"unable to compute output bounds.",
nFailedCount, nSamplePoints);
CPLFree( padfX );
CPLFree( padfXRevert );
CPLFree( pabSuccess );
return CE_Failure;
}
if( nFailedCount )
CPLDebug("GDAL",
"GDALSuggestedWarpOutput(): %d out of %d points failed to "
"transform.",
nFailedCount, nSamplePoints);
bool bIsGeographicCoords = false;
if( pfnTransformer == GDALGenImgProjTransform )
{
const GDALGenImgProjTransformInfo* pGIPTI =
static_cast<const GDALGenImgProjTransformInfo*>(pTransformArg);
if( pGIPTI->pSrcTransformer == GDALGeoLocTransform &&
pGIPTI->pDstTransformer == nullptr &&
pGIPTI->adfDstGeoTransform[0] == 0 &&
pGIPTI->adfDstGeoTransform[1] == 1 &&
pGIPTI->adfDstGeoTransform[2] == 0 &&
pGIPTI->adfDstGeoTransform[3] == 0 &&
pGIPTI->adfDstGeoTransform[4] == 0 &&
pGIPTI->adfDstGeoTransform[5] == 1 )
{
/* -------------------------------------------------------------------- */
/* Special case for geolocation array, to quickly find the bounds. */
/* -------------------------------------------------------------------- */
const GDALGeoLocTransformInfo* pGLTI =
static_cast<const GDALGeoLocTransformInfo*>(pGIPTI->pSrcTransformArg);
if( pGIPTI->pReproject == nullptr )
{
const char* pszGLSRS = CSLFetchNameValue(pGLTI->papszGeolocationInfo, "SRS");
if( pszGLSRS == nullptr )
{
bIsGeographicCoords = true;
}
else
{
OGRSpatialReference oSRS;
if( oSRS.SetFromUserInput(pszGLSRS) == OGRERR_NONE &&
oSRS.IsGeographic() )
{
bIsGeographicCoords = true;
}
}
}
for( const auto& xy: {
std::pair<double, double>(pGLTI->dfMinX, pGLTI->dfYAtMinX),
std::pair<double, double>(pGLTI->dfXAtMinY, pGLTI->dfMinY),
std::pair<double, double>(pGLTI->dfMaxX, pGLTI->dfYAtMaxX),
std::pair<double, double>(pGLTI->dfXAtMaxY, pGLTI->dfMaxY) } )
{
double x = xy.first;
double y = xy.second;
if( pGLTI->bSwapXY )
{
std::swap(x, y);
}
double xOut = std::numeric_limits<double>::quiet_NaN();
double yOut = std::numeric_limits<double>::quiet_NaN();
if( pGIPTI->pReproject == nullptr ||
pGIPTI->pReproject(pGIPTI->pReprojectArg, false, 1,
&x, &y, nullptr, nullptr) )
{
xOut = x;
yOut = y;
}
dfMinXOut = std::min(dfMinXOut, xOut);
dfMinYOut = std::min(dfMinYOut, yOut);
dfMaxXOut = std::max(dfMaxXOut, xOut);
dfMaxYOut = std::max(dfMaxYOut, yOut);
}
}
else if( pGIPTI->pSrcTransformer == nullptr &&
pGIPTI->pDstTransformer == nullptr &&
pGIPTI->pReproject == GDALReprojectionTransform &&
pGIPTI->adfDstGeoTransform[0] == 0 &&
pGIPTI->adfDstGeoTransform[1] == 1 &&
pGIPTI->adfDstGeoTransform[2] == 0 &&
pGIPTI->adfDstGeoTransform[3] == 0 &&
pGIPTI->adfDstGeoTransform[4] == 0 &&
pGIPTI->adfDstGeoTransform[5] == 1 )
{
/* -------------------------------------------------------------------- */
/* Special case for warping using source geotransform and reprojection */
/* to deal with the poles. */
/* -------------------------------------------------------------------- */
const GDALReprojectionTransformInfo* psRTI =
static_cast<const GDALReprojectionTransformInfo*>(pGIPTI->pReprojectArg);
const OGRSpatialReference* poTargetCRS = psRTI->poForwardTransform->GetTargetCS();
if( poTargetCRS != nullptr &&
psRTI->poReverseTransform != nullptr &&
poTargetCRS->IsGeographic() &&
fabs(poTargetCRS->GetAngularUnits() - CPLAtof(SRS_UA_DEGREE_CONV)) < 1e-9 )
{
bIsGeographicCoords = true;
std::unique_ptr<CPLConfigOptionSetter> poSetter;
if( pGIPTI->bCheckWithInvertPROJ )
{
// CHECK_WITH_INVERT_PROJ=YES prevent reliable transformation
// of poles.
poSetter = cpl::make_unique<CPLConfigOptionSetter>(
"CHECK_WITH_INVERT_PROJ", "NO", false);
GDALRefreshGenImgProjTransformer(pTransformArg);
// GDALRefreshGenImgProjTransformer() has invalidated psRTI
psRTI = static_cast<const GDALReprojectionTransformInfo*>(
pGIPTI->pReprojectArg);
}
for( const auto& sign : iSignArray )
{
double X = 0.0;
const double Yinit = 90.0 * sign;
double Y = Yinit;
if( psRTI->poReverseTransform->Transform(1, &X, &Y) )
{
const auto invGT = pGIPTI->adfSrcInvGeoTransform;
const double x = invGT[0] + X * invGT[1] + Y * invGT[2];
const double y = invGT[3] + X * invGT[4] + Y * invGT[5];
if( x >= 0 && x <= nInXSize && y >= 0 && y <= nInYSize )
{
if( psRTI->poForwardTransform->Transform(1, &X, &Y) &&
fabs(Y - Yinit) <= 1e-6 )
{
dfMinXOut = -180;
dfMaxXOut = 180;
if( sign < 0 )
dfMinYOut = Yinit;
else
dfMaxYOut = Yinit;
}
}
}
}
if( poSetter )
{
poSetter.reset();
GDALRefreshGenImgProjTransformer(pTransformArg);
pGIPTI =
static_cast<const GDALGenImgProjTransformInfo*>(pTransformArg);
psRTI =
static_cast<const GDALReprojectionTransformInfo*>(pGIPTI->pReprojectArg);
poTargetCRS = psRTI->poForwardTransform->GetTargetCS();
}
}
// Use TransformBounds() to handle more particular cases
const auto poSourceCRS = psRTI->poForwardTransform->GetSourceCS();