forked from MapServer/MapServer
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mapcontour.c
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mapcontour.c
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/**********************************************************************
* $Id: mapcontour.c 12629 2011-10-06 18:06:34Z aboudreault $
*
* Project: MapServer
* Purpose: Contour Layer
* Author: Alan Boudreault (aboudreault@mapgears.com)
* Author: Daniel Morissette (dmorissette@mapgears.com)
*
**********************************************************************
* Copyright (c) 2011, Alan Boudreault, MapGears
*
* 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 of this Software or works derived from this 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 "mapserver.h"
#include "mapcopy.h"
#include "mapresample.h"
#include "ogr_api.h"
#include "ogr_srs_api.h"
#include "gdal.h"
#include "gdal_alg.h"
#include "mapows.h"
#include "mapthread.h"
#include "mapraster.h"
#include "cpl_string.h"
#define GEO_TRANS(tr,x,y) ((tr)[0]+(tr)[1]*(x)+(tr)[2]*(y))
extern int InvGeoTransform(double *gt_in, double *gt_out);
typedef struct {
/* OGR DataSource */
layerObj ogrLayer;
/* internal use */
GDALDatasetH hOrigDS;
GDALDatasetH hDS;
double *buffer; /* memory dataset buffer */
rectObj extent; /* original dataset extent */
OGRDataSourceH hOGRDS;
double cellsize;
} contourLayerInfo;
static int msContourLayerInitItemInfo(layerObj *layer)
{
contourLayerInfo *clinfo = (contourLayerInfo *) layer->layerinfo;
if (clinfo == NULL) {
msSetError(MS_MISCERR, "Assertion failed: Contour layer not opened!!!",
"msContourLayerInitItemInfo()");
return MS_FAILURE;
}
return msLayerInitItemInfo(&clinfo->ogrLayer);
}
static void msContourLayerFreeItemInfo(layerObj *layer)
{
contourLayerInfo *clinfo = (contourLayerInfo *) layer->layerinfo;
if (clinfo == NULL) {
msSetError(MS_MISCERR, "Assertion failed: Contour layer not opened!!!",
"msContourLayerFreeItemInfo()");
return;
}
msLayerFreeItemInfo(&clinfo->ogrLayer);
}
static void msContourLayerInfoInitialize(layerObj *layer)
{
contourLayerInfo *clinfo = (contourLayerInfo *) layer->layerinfo;
if (clinfo != NULL)
return;
clinfo = (contourLayerInfo *) msSmallCalloc(1,sizeof(contourLayerInfo));
layer->layerinfo = clinfo;
clinfo->hOrigDS = NULL;
clinfo->hDS = NULL;
clinfo->extent.minx = -1.0;
clinfo->extent.miny = -1.0;
clinfo->extent.maxx = -1.0;
clinfo->extent.maxy = -1.0;
initLayer(&clinfo->ogrLayer, layer->map);
clinfo->ogrLayer.type = layer->type;
clinfo->ogrLayer.debug = layer->debug;
clinfo->ogrLayer.connectiontype = MS_OGR;
clinfo->ogrLayer.name = msStrdup(layer->name);
clinfo->ogrLayer.connection = (char*)msSmallMalloc(strlen(clinfo->ogrLayer.name)+13);
sprintf(clinfo->ogrLayer.connection, "__%s_CONTOUR__", clinfo->ogrLayer.name);
clinfo->ogrLayer.units = layer->units;
if (msOWSLookupMetadata(&(layer->metadata), "OFG", "ID_type") == NULL) {
msInsertHashTable(&(layer->metadata), "gml_ID_type", "Integer");
}
{
const char* elevItem = CSLFetchNameValue(layer->processing,"CONTOUR_ITEM");
if (elevItem && strlen(elevItem) > 0) {
char szTmp[100];
snprintf(szTmp, sizeof(szTmp), "%s_type", elevItem);
if (msOWSLookupMetadata(&(layer->metadata), "OFG", szTmp) == NULL) {
snprintf(szTmp, sizeof(szTmp), "gml_%s_type", elevItem);
msInsertHashTable(&(layer->metadata), szTmp, "Real");
}
}
}
}
static void msContourLayerInfoFree(layerObj *layer)
{
contourLayerInfo *clinfo = (contourLayerInfo *) layer->layerinfo;
if (clinfo == NULL)
return;
freeLayer(&clinfo->ogrLayer);
free(clinfo);
layer->layerinfo = NULL;
}
static int msContourLayerReadRaster(layerObj *layer, rectObj rect)
{
mapObj *map = layer->map;
char **bands;
char pointer[64], memDSPointer[128];
int band = 1;
double adfGeoTransform[6], adfInvGeoTransform[6];
double llx, lly, urx, ury;
rectObj copyRect, mapRect;
int dst_xsize, dst_ysize;
int virtual_grid_step_x, virtual_grid_step_y;
int src_xoff, src_yoff, src_xsize, src_ysize;
double map_cellsize_x, map_cellsize_y, dst_cellsize_x, dst_cellsize_y;
GDALRasterBandH hBand = NULL;
CPLErr eErr;
contourLayerInfo *clinfo = (contourLayerInfo *) layer->layerinfo;
if (layer->debug)
msDebug("Entering msContourLayerReadRaster().\n");
if (clinfo == NULL || clinfo->hOrigDS == NULL) {
msSetError(MS_MISCERR, "Assertion failed: Contour layer not opened!!!",
"msContourLayerReadRaster()");
return MS_FAILURE;
}
bands = CSLTokenizeStringComplex(
CSLFetchNameValue(layer->processing,"BANDS"), " ,", FALSE, FALSE );
if (CSLCount(bands) > 0) {
band = atoi(bands[0]);
if (band < 1 || band > GDALGetRasterCount(clinfo->hOrigDS)) {
msSetError( MS_IMGERR,
"BANDS PROCESSING directive includes illegal band '%d', should be from 1 to %d.",
"msContourLayerReadRaster()",
band, GDALGetRasterCount(clinfo->hOrigDS));
CSLDestroy(bands);
return MS_FAILURE;
}
}
CSLDestroy(bands);
hBand = GDALGetRasterBand(clinfo->hOrigDS, band);
if (hBand == NULL)
{
msSetError(MS_IMGERR,
"Band %d does not exist on dataset.",
"msContourLayerReadRaster()", band);
return MS_FAILURE;
}
if (layer->projection.numargs > 0 &&
EQUAL(layer->projection.args[0], "auto")) {
const char *wkt;
wkt = GDALGetProjectionRef(clinfo->hOrigDS);
if (wkt != NULL && strlen(wkt) > 0) {
if (msOGCWKT2ProjectionObj(wkt, &(layer->projection),
layer->debug) != MS_SUCCESS) {
char msg[MESSAGELENGTH*2];
errorObj *ms_error = msGetErrorObj();
snprintf( msg, sizeof(msg),
"%s\n"
"PROJECTION AUTO cannot be used for this "
"GDAL raster (`%s').",
ms_error->message, layer->data);
msg[MESSAGELENGTH-1] = '\0';
msSetError(MS_OGRERR, "%s","msDrawRasterLayer()",
msg);
return MS_FAILURE;
}
}
}
/*
* Compute the georeferenced window of overlap, and read the source data
* downsampled to match output resolution, or at full resolution if
* output resolution is lower than the source resolution.
*
* A large portion of this overlap calculation code was borrowed from
* msDrawRasterLayerGDAL().
* Would be possible to move some of this to a reusable function?
*
* Note: This code works only if no reprojection is involved. It would
* need rework to support cases where output projection differs from source
* data file projection.
*/
src_xsize = GDALGetRasterXSize(clinfo->hOrigDS);
src_ysize = GDALGetRasterYSize(clinfo->hOrigDS);
/* set the Dataset extent */
msGetGDALGeoTransform(clinfo->hOrigDS, map, layer, adfGeoTransform);
clinfo->extent.minx = adfGeoTransform[0];
clinfo->extent.maxy = adfGeoTransform[3];
clinfo->extent.maxx = adfGeoTransform[0] + src_xsize * adfGeoTransform[1];
clinfo->extent.miny = adfGeoTransform[3] + src_ysize * adfGeoTransform[5];
if (layer->transform) {
if (layer->debug)
msDebug("msContourLayerReadRaster(): Entering transform.\n");
InvGeoTransform(adfGeoTransform, adfInvGeoTransform);
mapRect = rect;
if( map->cellsize == 0 )
{
map->cellsize = msAdjustExtent(&mapRect,map->width,map->height);
}
map_cellsize_x = map_cellsize_y = map->cellsize;
/* if necessary, project the searchrect to source coords */
if (msProjectionsDiffer( &(map->projection), &(layer->projection))) {
if ( msProjectRect(&map->projection, &layer->projection, &mapRect)
!= MS_SUCCESS ) {
msDebug("msContourLayerReadRaster(%s): unable to reproject map request rectangle into layer projection, canceling.\n", layer->name);
return MS_FAILURE;
}
map_cellsize_x = MS_CELLSIZE(mapRect.minx, mapRect.maxx, map->width);
map_cellsize_y = MS_CELLSIZE(mapRect.miny, mapRect.maxy, map->height);
/* if the projection failed to project the extent requested, we need to
calculate the cellsize to preserve the initial map cellsize ratio */
if ( (mapRect.minx < GEO_TRANS(adfGeoTransform,0,src_ysize)) ||
(mapRect.maxx > GEO_TRANS(adfGeoTransform,src_xsize,0)) ||
(mapRect.miny < GEO_TRANS(adfGeoTransform+3,0,src_ysize)) ||
(mapRect.maxy > GEO_TRANS(adfGeoTransform+3,src_xsize,0)) ) {
int src_unit, dst_unit;
src_unit = GetMapserverUnitUsingProj(&map->projection);
dst_unit = GetMapserverUnitUsingProj(&layer->projection);
if (src_unit == -1 || dst_unit == -1) {
msDebug("msContourLayerReadRaster(%s): unable to reproject map request rectangle into layer projection, canceling.\n", layer->name);
return MS_FAILURE;
}
map_cellsize_x = MS_CONVERT_UNIT(src_unit, dst_unit,
MS_CELLSIZE(rect.minx, rect.maxx, map->width));
map_cellsize_y = MS_CONVERT_UNIT(src_unit, dst_unit,
MS_CELLSIZE(rect.miny, rect.maxy, map->height));
}
}
if (map_cellsize_x == 0 || map_cellsize_y == 0) {
if (layer->debug)
msDebug("msContourLayerReadRaster(): Cellsize can't be 0.\n");
return MS_FAILURE;
}
/* Adjust MapServer pixel model to GDAL pixel model */
mapRect.minx -= map_cellsize_x*0.5;
mapRect.maxx += map_cellsize_x*0.5;
mapRect.miny -= map_cellsize_y*0.5;
mapRect.maxy += map_cellsize_y*0.5;
/*
* If raw data cellsize (from geotransform) is larger than output map_cellsize
* then we want to extract only enough data to match the output map resolution
* which means that GDAL will automatically sample the data on read.
*
* To prevent bad contour effects on tile edges, we adjust the target cellsize
* to align the extracted window with a virtual grid based on the origin of the
* raw data and a virtual grid step size corresponding to an integer sampling step.
*
* If source data has a greater cellsize (i.e. lower res) that requested ouptut map
* then we use the raw data cellsize as target cellsize since there is no point in
* interpolating the data for contours in this case.
*/
virtual_grid_step_x = (int)floor(map_cellsize_x / ABS(adfGeoTransform[1]));
if (virtual_grid_step_x < 1)
virtual_grid_step_x = 1; /* Do not interpolate data if grid sampling step < 1 */
virtual_grid_step_y = (int)floor(map_cellsize_y / ABS(adfGeoTransform[5]));
if (virtual_grid_step_y < 1)
virtual_grid_step_y = 1; /* Do not interpolate data if grid sampling step < 1 */
/* target cellsize is a multiple of raw data cellsize based on grid step*/
dst_cellsize_x = ABS(adfGeoTransform[1]) * virtual_grid_step_x;
dst_cellsize_y = ABS(adfGeoTransform[5]) * virtual_grid_step_y;
/* Compute overlap between source and target views */
copyRect = mapRect;
if (copyRect.minx < GEO_TRANS(adfGeoTransform,0,src_ysize))
copyRect.minx = GEO_TRANS(adfGeoTransform,0,src_ysize);
if (copyRect.maxx > GEO_TRANS(adfGeoTransform,src_xsize,0))
copyRect.maxx = GEO_TRANS(adfGeoTransform,src_xsize,0);
if (copyRect.miny < GEO_TRANS(adfGeoTransform+3,0,src_ysize))
copyRect.miny = GEO_TRANS(adfGeoTransform+3,0,src_ysize);
if (copyRect.maxy > GEO_TRANS(adfGeoTransform+3,src_xsize,0))
copyRect.maxy = GEO_TRANS(adfGeoTransform+3,src_xsize,0);
if (copyRect.minx >= copyRect.maxx || copyRect.miny >= copyRect.maxy) {
if (layer->debug)
msDebug("msContourLayerReadRaster(): No overlap.\n");
return MS_SUCCESS;
}
/*
* Convert extraction window to raster coordinates
*/
llx = GEO_TRANS(adfInvGeoTransform+0,copyRect.minx,copyRect.miny);
lly = GEO_TRANS(adfInvGeoTransform+3,copyRect.minx,copyRect.miny);
urx = GEO_TRANS(adfInvGeoTransform+0,copyRect.maxx,copyRect.maxy);
ury = GEO_TRANS(adfInvGeoTransform+3,copyRect.maxx,copyRect.maxy);
/*
* Align extraction window with virtual grid
* (keep in mind raster coordinates origin is at upper-left)
* We also add an extra buffer to fix tile boundarie issues when zoomed
*/
llx = floor(llx / virtual_grid_step_x) * virtual_grid_step_x - (virtual_grid_step_x*5);
urx = ceil(urx / virtual_grid_step_x) * virtual_grid_step_x + (virtual_grid_step_x*5);
ury = floor(ury / virtual_grid_step_y) * virtual_grid_step_y - (virtual_grid_step_x*5);
lly = ceil(lly / virtual_grid_step_y) * virtual_grid_step_y + (virtual_grid_step_x*5);
src_xoff = MS_MAX(0,(int) floor(llx+0.5));
src_yoff = MS_MAX(0,(int) floor(ury+0.5));
src_xsize = MS_MIN(MS_MAX(0,(int) (urx - llx + 0.5)),
GDALGetRasterXSize(clinfo->hOrigDS) - src_xoff);
src_ysize = MS_MIN(MS_MAX(0,(int) (lly - ury + 0.5)),
GDALGetRasterYSize(clinfo->hOrigDS) - src_yoff);
/* Update the geographic extent (buffer added) */
/* TODO: a better way to go the geo_trans */
copyRect.minx = GEO_TRANS(adfGeoTransform+0,src_xoff,0);
copyRect.maxx = GEO_TRANS(adfGeoTransform+0,src_xoff+src_xsize,0);
copyRect.miny = GEO_TRANS(adfGeoTransform+3,0,src_yoff+src_ysize);
copyRect.maxy = GEO_TRANS(adfGeoTransform+3,0,src_yoff);
/*
* If input window is to small then stop here
*/
if (src_xsize < 2 || src_ysize < 2)
{
if (layer->debug)
msDebug("msContourLayerReadRaster(): input window too small, or no apparent overlap between map view and this window(1).\n");
return MS_SUCCESS;
}
/* Target buffer size */
dst_xsize = (int)ceil((copyRect.maxx - copyRect.minx) / dst_cellsize_x);
dst_ysize = (int)ceil((copyRect.maxy - copyRect.miny) / dst_cellsize_y);
if (dst_xsize == 0 || dst_ysize == 0) {
if (layer->debug)
msDebug("msContourLayerReadRaster(): no apparent overlap between map view and this window(2).\n");
return MS_SUCCESS;
}
if (layer->debug)
msDebug( "msContourLayerReadRaster(): src=%d,%d,%d,%d, dst=%d,%d,%d,%d\n",
src_xoff, src_yoff, src_xsize, src_ysize,
0, 0, dst_xsize, dst_ysize );
} else {
src_xoff = 0;
src_yoff = 0;
dst_xsize = src_xsize = MS_MIN(map->width,src_xsize);
dst_ysize = src_ysize = MS_MIN(map->height,src_ysize);
copyRect.minx = 0;
copyRect.miny = 0;
(void)copyRect.miny;
copyRect.maxx = map->width;
copyRect.maxy = map->height;
(void)copyRect.maxx;
dst_cellsize_y = dst_cellsize_x = 1;
}
/* -------------------------------------------------------------------- */
/* Allocate buffer, and read data into it. */
/* -------------------------------------------------------------------- */
clinfo->buffer = (double *) malloc(sizeof(double) * dst_xsize * dst_ysize);
if (clinfo->buffer == NULL) {
msSetError(MS_MEMERR, "Malloc(): Out of memory.", "msContourLayerReadRaster()");
return MS_FAILURE;
}
eErr = GDALRasterIO(hBand, GF_Read,
src_xoff, src_yoff, src_xsize, src_ysize,
clinfo->buffer, dst_xsize, dst_ysize, GDT_Float64,
0, 0);
if (eErr != CE_None) {
msSetError( MS_IOERR, "GDALRasterIO() failed: %s",
"msContourLayerReadRaster()", CPLGetLastErrorMsg() );
free(clinfo->buffer);
return MS_FAILURE;
}
memset(pointer, 0, sizeof(pointer));
CPLPrintPointer(pointer, clinfo->buffer, sizeof(pointer));
sprintf(memDSPointer,"MEM:::DATAPOINTER=%s,PIXELS=%d,LINES=%d,BANDS=1,DATATYPE=Float64",
pointer, dst_xsize, dst_ysize);
clinfo->hDS = GDALOpen(memDSPointer, GA_ReadOnly);
if (clinfo->hDS == NULL) {
msSetError(MS_IMGERR,
"Unable to open GDAL Memory dataset.",
"msContourLayerReadRaster()");
free(clinfo->buffer);
return MS_FAILURE;
}
{
// Copy nodata value from source dataset to memory dataset
int bHasNoData = FALSE;
double dfNoDataValue = GDALGetRasterNoDataValue(hBand, &bHasNoData);
if( bHasNoData )
{
GDALSetRasterNoDataValue(GDALGetRasterBand(clinfo->hDS, 1),
dfNoDataValue);
}
}
adfGeoTransform[0] = copyRect.minx;
adfGeoTransform[1] = dst_cellsize_x;
adfGeoTransform[2] = 0;
adfGeoTransform[3] = copyRect.maxy;
adfGeoTransform[4] = 0;
adfGeoTransform[5] = -dst_cellsize_y;
clinfo->cellsize = MS_MAX(dst_cellsize_x, dst_cellsize_y);
{
char buf[64];
sprintf(buf, "%lf", clinfo->cellsize);
msInsertHashTable(&layer->metadata, "__data_cellsize__", buf);
}
GDALSetGeoTransform(clinfo->hDS, adfGeoTransform);
return MS_SUCCESS;
}
static void msContourOGRCloseConnection(void *conn_handle)
{
OGRDataSourceH hDS = (OGRDataSourceH) conn_handle;
msAcquireLock(TLOCK_OGR);
OGR_DS_Destroy(hDS);
msReleaseLock(TLOCK_OGR);
}
/* Function that parses multiple options in the a list. It also supports
min/maxscaledenom checks. ie. "CONTOUR_INTERVAL=0,3842942:10" */
static char* msContourGetOption(layerObj *layer, const char *name)
{
int c, i, found = MS_FALSE;
char **values, **tmp, **options;
double maxscaledenom, minscaledenom;
char *value = NULL;
options = CSLFetchNameValueMultiple(layer->processing, name);
c = CSLCount(options);
/* First pass to find the value among options that have min/maxscaledenom */
/* specified */
for (i=0; i<c && found == MS_FALSE; ++i) {
values = CSLTokenizeStringComplex(options[i], ":", FALSE, FALSE);
if (CSLCount(values) == 2) {
tmp = CSLTokenizeStringComplex(values[0], ",", FALSE, FALSE);
if (CSLCount(tmp) == 2) {
minscaledenom = atof(tmp[0]);
maxscaledenom = atof(tmp[1]);
if (layer->map->scaledenom <= 0 ||
(((maxscaledenom <= 0) || (layer->map->scaledenom <= maxscaledenom)) &&
((minscaledenom <= 0) || (layer->map->scaledenom > minscaledenom)))) {
value = msStrdup(values[1]);
found = MS_TRUE;
}
}
CSLDestroy(tmp);
}
CSLDestroy(values);
}
/* Second pass to find the value among options that do NOT have */
/* min/maxscaledenom specified */
for (i=0; i<c && found == MS_FALSE; ++i) {
values = CSLTokenizeStringComplex(options[i], ":", FALSE, FALSE);
if (CSLCount(values) == 1) {
value = msStrdup(values[0]);
found = MS_TRUE;
}
CSLDestroy(values);
}
CSLDestroy(options);
return value;
}
static int msContourLayerGenerateContour(layerObj *layer)
{
OGRSFDriverH hDriver;
OGRFieldDefnH hFld;
OGRLayerH hLayer;
const char *elevItem;
char *option;
double interval = 1.0, levels[1000];
int levelCount = 0;
GDALRasterBandH hBand = NULL;
CPLErr eErr;
int bHasNoData = FALSE;
double dfNoDataValue;
contourLayerInfo *clinfo = (contourLayerInfo *) layer->layerinfo;
OGRRegisterAll();
if (clinfo == NULL) {
msSetError(MS_MISCERR, "Assertion failed: Contour layer not opened!!!",
"msContourLayerCreateOGRDataSource()");
return MS_FAILURE;
}
if (!clinfo->hDS) { /* no overlap */
return MS_SUCCESS;
}
hBand = GDALGetRasterBand(clinfo->hDS, 1);
if (hBand == NULL)
{
msSetError(MS_IMGERR,
"Band %d does not exist on dataset.",
"msContourLayerGenerateContour()", 1);
return MS_FAILURE;
}
/* Create the OGR DataSource */
hDriver = OGRGetDriverByName("Memory");
if (hDriver == NULL) {
msSetError(MS_OGRERR,
"Unable to get OGR driver 'Memory'.",
"msContourLayerCreateOGRDataSource()");
return MS_FAILURE;
}
clinfo->hOGRDS = OGR_Dr_CreateDataSource(hDriver, "", NULL);
if (clinfo->hOGRDS == NULL) {
msSetError(MS_OGRERR,
"Unable to create OGR DataSource.",
"msContourLayerCreateOGRDataSource()");
return MS_FAILURE;
}
hLayer = OGR_DS_CreateLayer(clinfo->hOGRDS, clinfo->ogrLayer.name, NULL,
wkbLineString, NULL );
hFld = OGR_Fld_Create("ID", OFTInteger);
OGR_Fld_SetWidth(hFld, 8);
OGR_L_CreateField(hLayer, hFld, FALSE);
OGR_Fld_Destroy(hFld);
/* Check if we have a coutour item specified */
elevItem = CSLFetchNameValue(layer->processing,"CONTOUR_ITEM");
if (elevItem && strlen(elevItem) > 0) {
hFld = OGR_Fld_Create(elevItem, OFTReal);
OGR_Fld_SetWidth(hFld, 12);
OGR_Fld_SetPrecision(hFld, 3);
OGR_L_CreateField(hLayer, hFld, FALSE);
OGR_Fld_Destroy(hFld);
}
else {
elevItem = NULL;
}
option = msContourGetOption(layer, "CONTOUR_INTERVAL");
if (option) {
interval = atof(option);
free(option);
}
option = msContourGetOption(layer, "CONTOUR_LEVELS");
if (option) {
int i,c;
char **levelsTmp;
levelsTmp = CSLTokenizeStringComplex(option, ",", FALSE, FALSE);
c = CSLCount(levelsTmp);
for (i=0;i<c && i<(int)(sizeof(levels)/sizeof(double)) ;++i)
levels[levelCount++] = atof(levelsTmp[i]);
CSLDestroy(levelsTmp);
free(option);
}
dfNoDataValue = GDALGetRasterNoDataValue(hBand, &bHasNoData);
eErr = GDALContourGenerate( hBand, interval, 0.0,
levelCount, levels,
bHasNoData, dfNoDataValue, hLayer,
OGR_FD_GetFieldIndex(OGR_L_GetLayerDefn( hLayer),
"ID" ),
(elevItem == NULL) ? -1 :
OGR_FD_GetFieldIndex(OGR_L_GetLayerDefn( hLayer),
elevItem ),
NULL, NULL );
if (eErr != CE_None) {
msSetError( MS_IOERR, "GDALContourGenerate() failed: %s",
"msContourLayerGenerateContour()", CPLGetLastErrorMsg() );
return MS_FAILURE;
}
msConnPoolRegister(&clinfo->ogrLayer, clinfo->hOGRDS, msContourOGRCloseConnection);
return MS_SUCCESS;
}
int msContourLayerOpen(layerObj *layer)
{
char *decrypted_path;
char szPath[MS_MAXPATHLEN];
contourLayerInfo *clinfo;
if (layer->debug)
msDebug("Entering msContourLayerOpen().\n");
/* If we don't have info, initialize an empty one now */
if (layer->layerinfo == NULL)
msContourLayerInfoInitialize(layer);
clinfo = (contourLayerInfo *) layer->layerinfo;
if (layer->data == NULL && layer->tileindex == NULL ) {
msSetError(MS_MISCERR,
"Layer %s has neither DATA nor TILEINDEX defined.",
"msContourLayerOpen()",
layer->name);
return MS_FAILURE;
}
if( layer->tileindex != NULL )
{
char szTilename[MS_MAXPATHLEN];
int status;
int tilelayerindex, tileitemindex, tilesrsindex;
rectObj searchrect;
layerObj* tlp;
shapeObj tshp;
char tilesrsname[1];
msInitShape(&tshp);
searchrect = layer->map->extent;
status = msDrawRasterSetupTileLayer(layer->map, layer,
&searchrect, MS_FALSE,
&tilelayerindex,
&tileitemindex,
&tilesrsindex,
&tlp);
if( status == MS_FAILURE )
{
return MS_FAILURE;
}
status = msDrawRasterIterateTileIndex(layer, tlp, &tshp,
tileitemindex, -1,
szTilename, sizeof(szTilename),
tilesrsname, sizeof(tilesrsname));
if( status == MS_FAILURE || status == MS_DONE ) {
if( status == MS_DONE )
{
if (layer->debug)
msDebug("No raster matching filter.\n");
}
msDrawRasterCleanupTileLayer(tlp, tilelayerindex);
return MS_FAILURE;
}
msDrawRasterCleanupTileLayer(tlp, tilelayerindex);
msDrawRasterBuildRasterPath(layer->map, layer, szTilename, szPath);
decrypted_path = msStrdup(szPath);
/* Cancel the time filter that might have been set on ours in case of */
/* a inline tileindex */
msFreeExpression(&layer->filter);
msInitExpression(&layer->filter);
}
else
{
msTryBuildPath3(szPath, layer->map->mappath, layer->map->shapepath, layer->data);
decrypted_path = msDecryptStringTokens(layer->map, szPath);
}
GDALAllRegister();
/* Open the original Dataset */
msAcquireLock(TLOCK_GDAL);
if (decrypted_path) {
clinfo->hOrigDS = GDALOpen(decrypted_path, GA_ReadOnly);
msFree(decrypted_path);
} else
clinfo->hOrigDS = NULL;
msReleaseLock(TLOCK_GDAL);
if (clinfo->hOrigDS == NULL) {
msSetError(MS_IMGERR,
"Unable to open GDAL dataset.",
"msContourLayerOpen()");
return MS_FAILURE;
}
/* Open the raster source */
if (msContourLayerReadRaster(layer, layer->map->extent) != MS_SUCCESS)
return MS_FAILURE;
/* Generate Contour Dataset */
if (msContourLayerGenerateContour(layer) != MS_SUCCESS)
return MS_FAILURE;
if (clinfo->hDS) {
GDALClose(clinfo->hDS);
clinfo->hDS = NULL;
free(clinfo->buffer);
}
/* Open our virtual ogr layer */
if (clinfo->hOGRDS && (msLayerOpen(&clinfo->ogrLayer) != MS_SUCCESS))
return MS_FAILURE;
return MS_SUCCESS;
}
int msContourLayerIsOpen(layerObj *layer)
{
if (layer->layerinfo)
return MS_TRUE;
return MS_FALSE;
}
int msContourLayerClose(layerObj *layer)
{
contourLayerInfo *clinfo = (contourLayerInfo *) layer->layerinfo;
if (layer->debug)
msDebug("Entering msContourLayerClose().\n");
if (clinfo) {
if (clinfo->hOGRDS)
msConnPoolRelease(&clinfo->ogrLayer, clinfo->hOGRDS);
msLayerClose(&clinfo->ogrLayer);
if (clinfo->hDS) {
GDALClose(clinfo->hDS);
clinfo->hDS = NULL;
free(clinfo->buffer);
}
if (clinfo->hOrigDS) {
GDALClose(clinfo->hOrigDS);
clinfo->hOrigDS = NULL;
}
msContourLayerInfoFree(layer);
}
return MS_SUCCESS;
}
int msContourLayerGetItems(layerObj *layer)
{
const char* elevItem;
contourLayerInfo *clinfo = (contourLayerInfo *) layer->layerinfo;
if (clinfo == NULL) {
msSetError(MS_MISCERR, "Assertion failed: Contour layer not opened!!!",
"msContourLayerGetItems()");
return MS_FAILURE;
}
layer->numitems = 0;
layer->items = (char **) msSmallCalloc(sizeof(char *),2);
layer->items[layer->numitems++] = msStrdup("ID");
elevItem = CSLFetchNameValue(layer->processing,"CONTOUR_ITEM");
if (elevItem && strlen(elevItem) > 0) {
layer->items[layer->numitems++] = msStrdup(elevItem);
}
return msLayerGetItems(&clinfo->ogrLayer);
}
int msContourLayerWhichShapes(layerObj *layer, rectObj rect, int isQuery)
{
int i;
rectObj newRect;
contourLayerInfo *clinfo = (contourLayerInfo *) layer->layerinfo;
if (layer->debug)
msDebug("Entering msContourLayerWhichShapes().\n");
if (clinfo == NULL) {
msSetError(MS_MISCERR, "Assertion failed: Contour layer not opened!!!",
"msContourLayerWhichShapes()");
return MS_FAILURE;
}
if( isQuery )
{
newRect = layer->map->extent;
}
else
{
newRect = rect;
/* if necessary, project the searchrect to source coords */
if (msProjectionsDiffer( &(layer->map->projection), &(layer->projection))) {
if (msProjectRect(&layer->projection, &layer->map->projection, &newRect)
!= MS_SUCCESS ) {
msDebug("msContourLayerWhichShapes(%s): unable to reproject map request rectangle into layer projection, canceling.\n", layer->name);
return MS_FAILURE;
}
}
}
/* regenerate the raster io */
if (clinfo->hOGRDS)
msConnPoolRelease(&clinfo->ogrLayer, clinfo->hOGRDS);
msLayerClose(&clinfo->ogrLayer);
/* Open the raster source */
if (msContourLayerReadRaster(layer, newRect) != MS_SUCCESS)
return MS_FAILURE;
/* Generate Contour Dataset */
if (msContourLayerGenerateContour(layer) != MS_SUCCESS)
return MS_FAILURE;
if (clinfo->hDS) {
GDALClose(clinfo->hDS);
clinfo->hDS = NULL;
free(clinfo->buffer);
}
if (!clinfo->hOGRDS) /* no overlap */
return MS_DONE;
/* Open our virtual ogr layer */
if (msLayerOpen(&clinfo->ogrLayer) != MS_SUCCESS)
return MS_FAILURE;
clinfo->ogrLayer.numitems = layer->numitems;
clinfo->ogrLayer.items = (char **) msSmallMalloc(sizeof(char *)*layer->numitems);
for (i=0; i<layer->numitems;++i) {
clinfo->ogrLayer.items[i] = msStrdup(layer->items[i]);
}
return msLayerWhichShapes(&clinfo->ogrLayer, rect, isQuery);
}
int msContourLayerGetShape(layerObj *layer, shapeObj *shape, resultObj *record)
{
contourLayerInfo *clinfo = (contourLayerInfo *) layer->layerinfo;
if (layer->debug)
msDebug("Entering msContourLayerGetShape().\n");
if (clinfo == NULL) {
msSetError(MS_MISCERR, "Assertion failed: Contour layer not opened!!!",
"msContourLayerGetShape()");
return MS_FAILURE;
}
return msLayerGetShape(&clinfo->ogrLayer, shape, record);
}
int msContourLayerNextShape(layerObj *layer, shapeObj *shape)
{
contourLayerInfo *clinfo = (contourLayerInfo *) layer->layerinfo;
if (layer->debug)
msDebug("Entering msContourLayerNextShape().\n");
if (clinfo == NULL) {
msSetError(MS_MISCERR, "Assertion failed: Contour layer not opened!!!",
"msContourLayerNextShape()");
return MS_FAILURE;
}
return msLayerNextShape(&clinfo->ogrLayer, shape);
}
/************************************************************************/
/* msContourLayerGetExtent() */
/* Simple copy of the maprasterquery.c file. might change in the future */
/************************************************************************/
int msContourLayerGetExtent(layerObj *layer, rectObj *extent)
{
contourLayerInfo *clinfo = (contourLayerInfo *) layer->layerinfo;
if (layer->debug)
msDebug("Entering msContourLayerGetExtent().\n");
if (clinfo == NULL) {
msSetError(MS_MISCERR, "Assertion failed: Contour layer not opened!!!",
"msContourLayerGetExtent()");
return MS_FAILURE;
}
MS_COPYRECT(extent, &clinfo->extent);
return MS_SUCCESS;
}
/************************************************************************/
/* msContourLayerSetTimeFilter() */
/* */
/* This function is actually just used in the context of */
/* setting a filter on the tileindex for time based queries. */
/* For instance via WMS requests. */
/* */
/* If a local shapefile tileindex is in use, we will set a */
/* backtics filter (shapefile compatible). If another layer is */
/* being used as the tileindex then we will forward the */
/* SetTimeFilter call to it. If there is no tileindex in */
/* place, we do nothing. */
/************************************************************************/
int msContourLayerSetTimeFilter(layerObj *layer, const char *timestring,
const char *timefield)
{
int tilelayerindex;
if (layer->debug)
msDebug("msContourLayerSetTimeFilter(%s,%s).\n", timestring, timefield);
/* -------------------------------------------------------------------- */
/* If we don't have a tileindex the time filter has no effect. */
/* -------------------------------------------------------------------- */
if( layer->tileindex == NULL )
{
if (layer->debug)
msDebug("msContourLayerSetTimeFilter(): time filter without effect on layers without tileindex.\n");
return MS_SUCCESS;
}
/* -------------------------------------------------------------------- */
/* Find the tileindex layer. */
/* -------------------------------------------------------------------- */
tilelayerindex = msGetLayerIndex(layer->map, layer->tileindex);
/* -------------------------------------------------------------------- */
/* If we are using a local shapefile as our tileindex (that is */
/* to say, the tileindex name is not of another layer), then we */
/* just install a backtics style filter on the current layer. */
/* -------------------------------------------------------------------- */
if( tilelayerindex == -1 )