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gdalproximity.cpp
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gdalproximity.cpp
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/******************************************************************************
*
* Project: GDAL
* Purpose: Compute each pixel's proximity to a set of target pixels.
* Author: Frank Warmerdam, warmerdam@pobox.com
*
******************************************************************************
* Copyright (c) 2008, Frank Warmerdam
* Copyright (c) 2009-2010, 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_alg.h"
#include <cmath>
#include <cstdlib>
#include <algorithm>
#include "cpl_conv.h"
#include "cpl_error.h"
#include "cpl_progress.h"
#include "cpl_string.h"
#include "cpl_vsi.h"
#include "gdal.h"
CPL_CVSID("$Id$")
static CPLErr ProcessProximityLine(GInt32 *panSrcScanline, int *panNearX,
int *panNearY, int bForward, int iLine,
int nXSize, double nMaxDist,
float *pafProximity,
double *pdfSrcNoDataValue, int nTargetValues,
int *panTargetValues);
/************************************************************************/
/* GDALComputeProximity() */
/************************************************************************/
/**
Compute the proximity of all pixels in the image to a set of pixels in
the source image.
This function attempts to compute the proximity of all pixels in
the image to a set of pixels in the source image. The following
options are used to define the behavior of the function. By
default all non-zero pixels in hSrcBand will be considered the
"target", and all proximities will be computed in pixels. Note
that target pixels are set to the value corresponding to a distance
of zero.
The progress function args may be NULL or a valid progress reporting function
such as GDALTermProgress/NULL.
Options:
VALUES=n[,n]*
A list of target pixel values to measure the distance from. If this
option is not provided proximity will be computed from non-zero
pixel values. Currently pixel values are internally processed as
integers.
DISTUNITS=[PIXEL]/GEO
Indicates whether distances will be computed in pixel units or
in georeferenced units. The default is pixel units. This also
determines the interpretation of MAXDIST.
MAXDIST=n
The maximum distance to search. Proximity distances greater than
this value will not be computed. Instead output pixels will be
set to a nodata value.
NODATA=n
The NODATA value to use on the output band for pixels that are
beyond MAXDIST. If not provided, the hProximityBand will be
queried for a nodata value. If one is not found, 65535 will be used.
USE_INPUT_NODATA=YES/NO
If this option is set, the input data set no-data value will be
respected. Leaving no data pixels in the input as no data pixels in
the proximity output.
FIXED_BUF_VAL=n
If this option is set, all pixels within the MAXDIST threadhold are
set to this fixed value instead of to a proximity distance.
*/
CPLErr CPL_STDCALL GDALComputeProximity(GDALRasterBandH hSrcBand,
GDALRasterBandH hProximityBand,
char **papszOptions,
GDALProgressFunc pfnProgress,
void *pProgressArg)
{
VALIDATE_POINTER1(hSrcBand, "GDALComputeProximity", CE_Failure);
VALIDATE_POINTER1(hProximityBand, "GDALComputeProximity", CE_Failure);
if (pfnProgress == nullptr)
pfnProgress = GDALDummyProgress;
/* -------------------------------------------------------------------- */
/* Are we using pixels or georeferenced coordinates for distances? */
/* -------------------------------------------------------------------- */
double dfDistMult = 1.0;
const char *pszOpt = CSLFetchNameValue(papszOptions, "DISTUNITS");
if (pszOpt)
{
if (EQUAL(pszOpt, "GEO"))
{
GDALDatasetH hSrcDS = GDALGetBandDataset(hSrcBand);
if (hSrcDS)
{
double adfGeoTransform[6] = {0.0, 0.0, 0.0, 0.0, 0.0, 0.0};
GDALGetGeoTransform(hSrcDS, adfGeoTransform);
if (std::abs(adfGeoTransform[1]) !=
std::abs(adfGeoTransform[5]))
CPLError(
CE_Warning, CPLE_AppDefined,
"Pixels not square, distances will be inaccurate.");
dfDistMult = std::abs(adfGeoTransform[1]);
}
}
else if (!EQUAL(pszOpt, "PIXEL"))
{
CPLError(
CE_Failure, CPLE_AppDefined,
"Unrecognized DISTUNITS value '%s', should be GEO or PIXEL.",
pszOpt);
return CE_Failure;
}
}
/* -------------------------------------------------------------------- */
/* What is our maxdist value? */
/* -------------------------------------------------------------------- */
pszOpt = CSLFetchNameValue(papszOptions, "MAXDIST");
const double dfMaxDist = pszOpt ? CPLAtof(pszOpt) / dfDistMult
: GDALGetRasterBandXSize(hSrcBand) +
GDALGetRasterBandYSize(hSrcBand);
CPLDebug("GDAL", "MAXDIST=%g, DISTMULT=%g", dfMaxDist, dfDistMult);
/* -------------------------------------------------------------------- */
/* Verify the source and destination are compatible. */
/* -------------------------------------------------------------------- */
const int nXSize = GDALGetRasterBandXSize(hSrcBand);
const int nYSize = GDALGetRasterBandYSize(hSrcBand);
if (nXSize != GDALGetRasterBandXSize(hProximityBand) ||
nYSize != GDALGetRasterBandYSize(hProximityBand))
{
CPLError(CE_Failure, CPLE_AppDefined,
"Source and proximity bands are not the same size.");
return CE_Failure;
}
/* -------------------------------------------------------------------- */
/* Get input NODATA value. */
/* -------------------------------------------------------------------- */
double dfSrcNoDataValue = 0.0;
double *pdfSrcNoData = nullptr;
if (CPLFetchBool(papszOptions, "USE_INPUT_NODATA", false))
{
int bSrcHasNoData = 0;
dfSrcNoDataValue = GDALGetRasterNoDataValue(hSrcBand, &bSrcHasNoData);
if (bSrcHasNoData)
pdfSrcNoData = &dfSrcNoDataValue;
}
/* -------------------------------------------------------------------- */
/* Get output NODATA value. */
/* -------------------------------------------------------------------- */
float fNoDataValue = 0.0f;
pszOpt = CSLFetchNameValue(papszOptions, "NODATA");
if (pszOpt != nullptr)
{
fNoDataValue = static_cast<float>(CPLAtof(pszOpt));
}
else
{
int bSuccess = FALSE;
fNoDataValue = static_cast<float>(
GDALGetRasterNoDataValue(hProximityBand, &bSuccess));
if (!bSuccess)
fNoDataValue = 65535.0;
}
/* -------------------------------------------------------------------- */
/* Is there a fixed value we wish to force the buffer area to? */
/* -------------------------------------------------------------------- */
double dfFixedBufVal = 0.0;
bool bFixedBufVal = false;
pszOpt = CSLFetchNameValue(papszOptions, "FIXED_BUF_VAL");
if (pszOpt)
{
dfFixedBufVal = CPLAtof(pszOpt);
bFixedBufVal = true;
}
/* -------------------------------------------------------------------- */
/* Get the target value(s). */
/* -------------------------------------------------------------------- */
int *panTargetValues = nullptr;
int nTargetValues = 0;
pszOpt = CSLFetchNameValue(papszOptions, "VALUES");
if (pszOpt != nullptr)
{
char **papszValuesTokens =
CSLTokenizeStringComplex(pszOpt, ",", FALSE, FALSE);
nTargetValues = CSLCount(papszValuesTokens);
panTargetValues =
static_cast<int *>(CPLCalloc(sizeof(int), nTargetValues));
for (int i = 0; i < nTargetValues; i++)
panTargetValues[i] = atoi(papszValuesTokens[i]);
CSLDestroy(papszValuesTokens);
}
/* -------------------------------------------------------------------- */
/* Initialize progress counter. */
/* -------------------------------------------------------------------- */
if (!pfnProgress(0.0, "", pProgressArg))
{
CPLError(CE_Failure, CPLE_UserInterrupt, "User terminated");
CPLFree(panTargetValues);
return CE_Failure;
}
/* -------------------------------------------------------------------- */
/* We need a signed type for the working proximity values kept */
/* on disk. If our proximity band is not signed, then create a */
/* temporary file for this purpose. */
/* -------------------------------------------------------------------- */
GDALRasterBandH hWorkProximityBand = hProximityBand;
GDALDatasetH hWorkProximityDS = nullptr;
const GDALDataType eProxType = GDALGetRasterDataType(hProximityBand);
CPLErr eErr = CE_None;
// TODO(schwehr): Localize after removing gotos.
float *pafProximity = nullptr;
int *panNearX = nullptr;
int *panNearY = nullptr;
GInt32 *panSrcScanline = nullptr;
bool bTempFileAlreadyDeleted = false;
if (eProxType == GDT_Byte || eProxType == GDT_UInt16 ||
eProxType == GDT_UInt32)
{
GDALDriverH hDriver = GDALGetDriverByName("GTiff");
if (hDriver == nullptr)
{
CPLError(CE_Failure, CPLE_AppDefined,
"GDALComputeProximity needs GTiff driver");
eErr = CE_Failure;
goto end;
}
CPLString osTmpFile = CPLGenerateTempFilename("proximity");
hWorkProximityDS = GDALCreate(hDriver, osTmpFile, nXSize, nYSize, 1,
GDT_Float32, nullptr);
if (hWorkProximityDS == nullptr)
{
eErr = CE_Failure;
goto end;
}
// On Unix, attempt at deleting the temporary file now, so that
// if the process gets interrupted, it is automatically destroyed
// by the operating system.
bTempFileAlreadyDeleted = VSIUnlink(osTmpFile) == 0;
hWorkProximityBand = GDALGetRasterBand(hWorkProximityDS, 1);
}
/* -------------------------------------------------------------------- */
/* Allocate buffer for two scanlines of distances as floats */
/* (the current and last line). */
/* -------------------------------------------------------------------- */
pafProximity =
static_cast<float *>(VSI_MALLOC2_VERBOSE(sizeof(float), nXSize));
panNearX = static_cast<int *>(VSI_MALLOC2_VERBOSE(sizeof(int), nXSize));
panNearY = static_cast<int *>(VSI_MALLOC2_VERBOSE(sizeof(int), nXSize));
panSrcScanline =
static_cast<GInt32 *>(VSI_MALLOC2_VERBOSE(sizeof(GInt32), nXSize));
if (pafProximity == nullptr || panNearX == nullptr || panNearY == nullptr ||
panSrcScanline == nullptr)
{
eErr = CE_Failure;
goto end;
}
/* -------------------------------------------------------------------- */
/* Loop from top to bottom of the image. */
/* -------------------------------------------------------------------- */
for (int i = 0; i < nXSize; i++)
{
panNearX[i] = -1;
panNearY[i] = -1;
}
for (int iLine = 0; eErr == CE_None && iLine < nYSize; iLine++)
{
// Read for target values.
eErr = GDALRasterIO(hSrcBand, GF_Read, 0, iLine, nXSize, 1,
panSrcScanline, nXSize, 1, GDT_Int32, 0, 0);
if (eErr != CE_None)
break;
for (int i = 0; i < nXSize; i++)
pafProximity[i] = -1.0;
// Left to right.
ProcessProximityLine(panSrcScanline, panNearX, panNearY, TRUE, iLine,
nXSize, dfMaxDist, pafProximity, pdfSrcNoData,
nTargetValues, panTargetValues);
// Right to Left.
ProcessProximityLine(panSrcScanline, panNearX, panNearY, FALSE, iLine,
nXSize, dfMaxDist, pafProximity, pdfSrcNoData,
nTargetValues, panTargetValues);
// Write out results.
eErr = GDALRasterIO(hWorkProximityBand, GF_Write, 0, iLine, nXSize, 1,
pafProximity, nXSize, 1, GDT_Float32, 0, 0);
if (eErr != CE_None)
break;
if (!pfnProgress(0.5 * (iLine + 1) / static_cast<double>(nYSize), "",
pProgressArg))
{
CPLError(CE_Failure, CPLE_UserInterrupt, "User terminated");
eErr = CE_Failure;
}
}
/* -------------------------------------------------------------------- */
/* Loop from bottom to top of the image. */
/* -------------------------------------------------------------------- */
for (int i = 0; i < nXSize; i++)
{
panNearX[i] = -1;
panNearY[i] = -1;
}
for (int iLine = nYSize - 1; eErr == CE_None && iLine >= 0; iLine--)
{
// Read first pass proximity.
eErr = GDALRasterIO(hWorkProximityBand, GF_Read, 0, iLine, nXSize, 1,
pafProximity, nXSize, 1, GDT_Float32, 0, 0);
if (eErr != CE_None)
break;
// Read pixel values.
eErr = GDALRasterIO(hSrcBand, GF_Read, 0, iLine, nXSize, 1,
panSrcScanline, nXSize, 1, GDT_Int32, 0, 0);
if (eErr != CE_None)
break;
// Right to left.
ProcessProximityLine(panSrcScanline, panNearX, panNearY, FALSE, iLine,
nXSize, dfMaxDist, pafProximity, pdfSrcNoData,
nTargetValues, panTargetValues);
// Left to right.
ProcessProximityLine(panSrcScanline, panNearX, panNearY, TRUE, iLine,
nXSize, dfMaxDist, pafProximity, pdfSrcNoData,
nTargetValues, panTargetValues);
// Final post processing of distances.
for (int i = 0; i < nXSize; i++)
{
if (pafProximity[i] < 0.0)
pafProximity[i] = fNoDataValue;
else if (pafProximity[i] > 0.0)
{
if (bFixedBufVal)
pafProximity[i] = static_cast<float>(dfFixedBufVal);
else
pafProximity[i] =
static_cast<float>(pafProximity[i] * dfDistMult);
}
}
// Write out results.
eErr = GDALRasterIO(hProximityBand, GF_Write, 0, iLine, nXSize, 1,
pafProximity, nXSize, 1, GDT_Float32, 0, 0);
if (eErr != CE_None)
break;
if (!pfnProgress(0.5 + 0.5 * (nYSize - iLine) /
static_cast<double>(nYSize),
"", pProgressArg))
{
CPLError(CE_Failure, CPLE_UserInterrupt, "User terminated");
eErr = CE_Failure;
}
}
/* -------------------------------------------------------------------- */
/* Cleanup */
/* -------------------------------------------------------------------- */
end:
CPLFree(panNearX);
CPLFree(panNearY);
CPLFree(panSrcScanline);
CPLFree(pafProximity);
CPLFree(panTargetValues);
if (hWorkProximityDS != nullptr)
{
CPLString osProxFile = GDALGetDescription(hWorkProximityDS);
GDALClose(hWorkProximityDS);
if (!bTempFileAlreadyDeleted)
{
GDALDeleteDataset(GDALGetDriverByName("GTiff"), osProxFile);
}
}
return eErr;
}
/************************************************************************/
/* SquareDistance() */
/************************************************************************/
static double SquareDistance(double dfX1, double dfX2, double dfY1, double dfY2)
{
const double dfDX = dfX1 - dfX2;
const double dfDY = dfY1 - dfY2;
return dfDX * dfDX + dfDY * dfDY;
}
/************************************************************************/
/* ProcessProximityLine() */
/************************************************************************/
static CPLErr ProcessProximityLine(GInt32 *panSrcScanline, int *panNearX,
int *panNearY, int bForward, int iLine,
int nXSize, double dfMaxDist,
float *pafProximity,
double *pdfSrcNoDataValue, int nTargetValues,
int *panTargetValues)
{
const int iStart = bForward ? 0 : nXSize - 1;
const int iEnd = bForward ? nXSize : -1;
const int iStep = bForward ? 1 : -1;
for (int iPixel = iStart; iPixel != iEnd; iPixel += iStep)
{
bool bIsTarget = false;
/* --------------------------------------------------------------------
*/
/* Is the current pixel a target pixel? */
/* --------------------------------------------------------------------
*/
if (nTargetValues == 0)
{
bIsTarget = panSrcScanline[iPixel] != 0;
}
else
{
for (int i = 0; i < nTargetValues; i++)
{
if (panSrcScanline[iPixel] == panTargetValues[i])
bIsTarget = TRUE;
}
}
if (bIsTarget)
{
pafProximity[iPixel] = 0.0;
panNearX[iPixel] = iPixel;
panNearY[iPixel] = iLine;
continue;
}
/* --------------------------------------------------------------------
*/
/* Are we near(er) to the closest target to the above (below) */
/* pixel? */
/* --------------------------------------------------------------------
*/
double dfNearDistSq = std::max(dfMaxDist, static_cast<double>(nXSize)) *
std::max(dfMaxDist, static_cast<double>(nXSize)) *
2.0;
if (panNearX[iPixel] != -1)
{
const double dfDistSq = SquareDistance(panNearX[iPixel], iPixel,
panNearY[iPixel], iLine);
if (dfDistSq < dfNearDistSq)
{
dfNearDistSq = dfDistSq;
}
else
{
panNearX[iPixel] = -1;
panNearY[iPixel] = -1;
}
}
/* --------------------------------------------------------------------
*/
/* Are we near(er) to the closest target to the left (right) */
/* pixel? */
/* --------------------------------------------------------------------
*/
const int iLast = iPixel - iStep;
if (iPixel != iStart && panNearX[iLast] != -1)
{
const double dfDistSq =
SquareDistance(panNearX[iLast], iPixel, panNearY[iLast], iLine);
if (dfDistSq < dfNearDistSq)
{
dfNearDistSq = dfDistSq;
panNearX[iPixel] = panNearX[iLast];
panNearY[iPixel] = panNearY[iLast];
}
}
/* --------------------------------------------------------------------
*/
/* Are we near(er) to the closest target to the topright */
/* (bottom left) pixel? */
/* --------------------------------------------------------------------
*/
const int iTR = iPixel + iStep;
if (iTR != iEnd && panNearX[iTR] != -1)
{
const double dfDistSq =
SquareDistance(panNearX[iTR], iPixel, panNearY[iTR], iLine);
if (dfDistSq < dfNearDistSq)
{
dfNearDistSq = dfDistSq;
panNearX[iPixel] = panNearX[iTR];
panNearY[iPixel] = panNearY[iTR];
}
}
/* --------------------------------------------------------------------
*/
/* Update our proximity value. */
/* --------------------------------------------------------------------
*/
if (panNearX[iPixel] != -1 &&
(pdfSrcNoDataValue == nullptr ||
panSrcScanline[iPixel] != *pdfSrcNoDataValue) &&
dfNearDistSq <= dfMaxDist * dfMaxDist &&
(pafProximity[iPixel] < 0 ||
dfNearDistSq < pafProximity[iPixel] * pafProximity[iPixel]))
pafProximity[iPixel] = static_cast<float>(sqrt(dfNearDistSq));
}
return CE_None;
}