forked from OSGeo/gdal
/
postgisrasterdataset.cpp
3703 lines (3063 loc) · 124 KB
/
postgisrasterdataset.cpp
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/***********************************************************************
* File : postgisrasterdataset.cpp
* Project: PostGIS Raster driver
* Purpose: GDAL Dataset implementation for PostGIS Raster driver
* Author: Jorge Arevalo, jorge.arevalo@deimos-space.com
* jorgearevalo@libregis.org
*
* Author: David Zwarg, dzwarg@azavea.com
*
* Last changes: $Id: $
*
***********************************************************************
* Copyright (c) 2009 - 2013, Jorge Arevalo, David Zwarg
* Copyright (c) 2013, Even Rouault <even dot rouault at mines-paris dot org>
*
* 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 "gdal_frmts.h"
#include "postgisraster.h"
#include <math.h>
#ifdef _WIN32
#define rint(x) floor((x) + 0.5)
#endif
/* PostgreSQL defaults */
#define DEFAULT_SCHEMA "public"
#define DEFAULT_COLUMN "rast"
/** Note on read performance on mode=2:
There are different situations:
1) the table is registered in the raster_columns table and number of bands, minx,miny,maxx,maxy are available
a) no where clause, the table has a primary key and a GIST index on the raster column.
If the raster_columns advertize a scale_x and scale_y, use it.
Otherwise take the metadata of 10 rasters and compute and average scale_x, scale_y
With above information, we can build the dataset definition.
(Following logic is implemented in LoadSources())
During a IRasterIO() query,
i) we will do a SQL query to retrieve the PKID of tiles that intersect the query window.
ii) If some tiles are not registered as sources, then do a SQL query to fetch their metadata
and instantiate them and register them.
iii) If some tiles are not cached, then determine if the query window is not too big (w.r.t. GDAL cache),
and if not, then do a SQL query to fetch their raster column.
Note: if raster_columns show that all tiles have same dimensions, we can merge the query ii) and iii)
in the same one.
b) otherwise, do a full scan of metadata to build the sources
2) otherwise, throw a warning to the user and do a full scan of metadata is needed to build the sources
For 1b) and 2), during a IRasterIO() query, determine which sources are needed and not cached.
(Following logic is implemented in IRasterIO())
If the query window is not too big,
If there's a primary key, then do a SQL query on the IDs of uncached sources to fetch their raster column
and cache them.
Otherwise if there's a GIST index, do a SQL spatial query on the window to fetch their raster column,
and cache them (identification with registered sources is done with the top-left coordinates)
Otherwise do a SQL query based on the range of top-left coordinates of tiles that intersect the query window.
Conclusion: best performance is achieved with: no where clause, a primary key, a GIST index, known table extent
and, with moderate performance advantage :
- same scale_x, scale_y to save an initial SQL query,
- same blocksize_x, blocksize_y to save one SQL query per IRasterIO()
*/
/************************
* \brief Constructor
************************/
PostGISRasterDataset::PostGISRasterDataset():VRTDataset(0, 0) {
papszSubdatasets = NULL;
nSrid = -1;
nOverviewFactor = 1;
nBandsToCreate = 0;
poConn = NULL;
bRegularBlocking = false;
bAllTilesSnapToSameGrid = false;
bCheckAllTiles = CPLTestBool(
CPLGetConfigOption("PR_ALLOW_WHOLE_TABLE_SCAN", "YES"));
pszSchema = NULL;
pszTable = NULL;
pszColumn = NULL;
pszWhere = NULL;
pszProjection = NULL;
adfGeoTransform[GEOTRSFRM_TOPLEFT_X] = 0.0;
adfGeoTransform[GEOTRSFRM_ROTATION_PARAM1] = 0.0;
adfGeoTransform[GEOTRSFRM_TOPLEFT_Y] = 0.0;
adfGeoTransform[GEOTRSFRM_ROTATION_PARAM2] = 0.0;
adfGeoTransform[GEOTRSFRM_WE_RES] = 0;
adfGeoTransform[GEOTRSFRM_NS_RES] = 0;
adfGeoTransform[GEOTRSFRM_WE_RES] =
CPLAtof(CPLGetConfigOption("PR_WE_RES", NO_VALID_RES));
adfGeoTransform[GEOTRSFRM_NS_RES] =
CPLAtof(CPLGetConfigOption("PR_NS_RES", NO_VALID_RES));
// Default
resolutionStrategy = AVERAGE_APPROX_RESOLUTION;
const char * pszTmp = NULL;
// We ignore this option if we provided the desired resolution
if (CPLIsEqual(adfGeoTransform[GEOTRSFRM_WE_RES], CPLAtof(NO_VALID_RES)) ||
CPLIsEqual(adfGeoTransform[GEOTRSFRM_NS_RES], CPLAtof(NO_VALID_RES))) {
// Resolution didn't have a valid value, so, we initiate it
adfGeoTransform[GEOTRSFRM_WE_RES] = 0.0;
adfGeoTransform[GEOTRSFRM_NS_RES] = 0.0;
pszTmp =
CPLGetConfigOption("PR_RESOLUTION_STRATEGY", "AVERAGE_APPROX");
if (EQUAL(pszTmp, "LOWEST"))
resolutionStrategy = LOWEST_RESOLUTION;
else if (EQUAL(pszTmp, "HIGHEST"))
resolutionStrategy = HIGHEST_RESOLUTION;
else if (EQUAL(pszTmp, "USER"))
resolutionStrategy = USER_RESOLUTION;
else if (EQUAL(pszTmp, "AVERAGE"))
resolutionStrategy = AVERAGE_RESOLUTION;
}
else {
resolutionStrategy = USER_RESOLUTION;
#ifdef DEBUG_VERBOSE
pszTmp = "USER";
#endif
}
#ifdef DEBUG_VERBOSE
CPLDebug("PostGIS_Raster", "PostGISRasterDataset::Constructor:"
"STRATEGY = %s", pszTmp);
#endif
m_nTiles = 0;
nMode = NO_MODE;
poDriver = NULL;
nRasterXSize = nRasterYSize = 0;
pszPrimaryKeyName = NULL;
bIsFastPK = false;
bHasTriedFetchingPrimaryKeyName = false;
papoSourcesHolders = NULL;
hQuadTree = NULL;
bHasBuiltOverviews = false;
nOverviewCount = 0;
papoOverviewDS = NULL;
poParentDS = NULL;
bAssumeMultiBandReadPattern = true;
nNextExpectedBand = 1;
nXOffPrev = 0;
nYOffPrev = 0;
nXSizePrev = 0;
nYSizePrev = 0;
bHasTriedHasSpatialIndex = false;
bHasSpatialIndex = false;
bBuildQuadTreeDynamically = false;
bTilesSameDimension = false;
nTileWidth = 0;
nTileHeight = 0;
SetWritable(false);
/**
* TODO: Parametrize bAllTilesSnapToSameGrid. It controls if all the
* raster rows, in ONE_RASTER_PER_TABLE mode, must be checked to
* test if they snap to the same grid and have the same SRID. It can
* be the user decision, if he/she's sure all the rows pass the
* test and want more speed.
**/
}
/************************
* \brief Constructor
************************/
PostGISRasterDataset::~PostGISRasterDataset() {
if (pszSchema) {
CPLFree(pszSchema);
pszSchema = NULL;
}
if (pszTable) {
CPLFree(pszTable);
pszTable = NULL;
}
if (pszColumn) {
CPLFree(pszColumn);
pszColumn = NULL;
}
if (pszWhere) {
CPLFree(pszWhere);
pszWhere = NULL;
}
if (pszProjection) {
CPLFree(pszProjection);
pszProjection = NULL;
}
if (pszPrimaryKeyName) {
CPLFree(pszPrimaryKeyName);
pszPrimaryKeyName = NULL;
}
if (papszSubdatasets) {
CSLDestroy(papszSubdatasets);
papszSubdatasets = NULL;
}
if (hQuadTree) {
CPLQuadTreeDestroy(hQuadTree);
hQuadTree = NULL;
}
// Call it now so that the VRT sources
// are deleted and that there is no longer any code
// referencing the bands of the source holders.
// Otherwise this would go wrong because
// of the deleting the source holders just below.
CloseDependentDatasets();
if (papoSourcesHolders) {
int i;
for(i = 0; i < m_nTiles; i++) {
if (papoSourcesHolders[i])
delete papoSourcesHolders[i];
}
VSIFree(papoSourcesHolders);
papoSourcesHolders = NULL;
}
}
/************************************************************************/
/* CloseDependentDatasets() */
/************************************************************************/
int PostGISRasterDataset::CloseDependentDatasets()
{
int bHasDroppedRef = VRTDataset::CloseDependentDatasets();
if( nOverviewCount > 0 )
{
int i;
for(i = 0; i < nOverviewCount; i++)
{
delete papoOverviewDS[i];
}
CPLFree(papoOverviewDS);
papoOverviewDS = NULL;
nOverviewCount = 0;
bHasDroppedRef = TRUE;
}
return bHasDroppedRef;
}
/************************************************************************/
/* HasSpatialIndex() */
/************************************************************************/
GBool PostGISRasterDataset::HasSpatialIndex()
{
CPLString osCommand;
PGresult* poResult = NULL;
// If exists, return it
if (bHasTriedHasSpatialIndex) {
return bHasSpatialIndex;
}
bHasTriedHasSpatialIndex = true;
/* For debugging purposes only */
if( CPLTestBool(CPLGetConfigOption("PR_DISABLE_GIST", "FALSE") ) )
return false;
// Copyright dustymugs !!!
osCommand.Printf(
"SELECT n.nspname AS schema_name, c2.relname AS table_name, att.attname AS column_name, "
" c.relname AS index_name, am.amname AS index_type "
"FROM pg_catalog.pg_class c "
"JOIN pg_catalog.pg_index i ON i.indexrelid = c.oid "
"JOIN pg_catalog.pg_class c2 ON i.indrelid = c2.oid "
"JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace "
"JOIN pg_am am ON c.relam = am.oid "
"JOIN pg_attribute att ON att.attrelid = c2.oid "
"AND pg_catalog.format_type(att.atttypid, att.atttypmod) = 'raster' "
"WHERE c.relkind IN ('i') "
"AND am.amname = 'gist' "
"AND strpos(split_part(pg_catalog.pg_get_indexdef(i.indexrelid, 0, true), ' gist ', 2), att.attname) > 0 "
"AND n.nspname = '%s' "
"AND c2.relname = '%s' "
"AND att.attname = '%s' ", pszSchema, pszTable, pszColumn);
#ifdef DEBUG_QUERY
CPLDebug("PostGIS_Raster",
"PostGISRasterDataset::HasSpatialIndex(): Query: %s",
osCommand.c_str());
#endif
poResult = PQexec(poConn, osCommand.c_str());
if (poResult == NULL ||
PQresultStatus(poResult) != PGRES_TUPLES_OK ||
PQntuples(poResult) <= 0 )
{
bHasSpatialIndex = false;
CPLDebug("PostGIS_Raster", "For better performance, creating a spatial index "
"with 'CREATE INDEX %s_%s_%s_gist_idx ON %s.%s USING GIST (ST_ConvexHull(%s))' is advised",
pszSchema, pszTable, pszColumn, pszSchema, pszTable, pszColumn);
}
else
{
bHasSpatialIndex = true;
}
if( poResult )
PQclear(poResult);
return bHasSpatialIndex;
}
/***********************************************************************
* \brief Look for a primary key in the table selected by the user
*
* If the table does not have a primary key, it returns NULL
**********************************************************************/
const char * PostGISRasterDataset::GetPrimaryKeyRef()
{
CPLString osCommand;
PGresult* poResult = NULL;
// If exists, return it
if (bHasTriedFetchingPrimaryKeyName) {
return pszPrimaryKeyName;
}
bHasTriedFetchingPrimaryKeyName = true;
/* For debugging purposes only */
if( CPLTestBool(CPLGetConfigOption("PR_DISABLE_PK", "FALSE") ) )
return NULL;
/* Determine the primary key/unique column on the table */
osCommand.Printf("select d.attname from pg_catalog.pg_constraint "
"as a join pg_catalog.pg_indexes as b on a.conname = "
"b.indexname join pg_catalog.pg_class as c on c.relname = "
"b.tablename join pg_catalog.pg_attribute as d on "
"c.relfilenode = d.attrelid where b.schemaname = '%s' and "
"b.tablename = '%s' and d.attnum = a.conkey[1] and a.contype "
"in ('p', 'u')", pszSchema, pszTable);
#ifdef DEBUG_QUERY
CPLDebug("PostGIS_Raster",
"PostGISRasterDataset::GetPrimaryKeyRef(): Query: %s",
osCommand.c_str());
#endif
poResult = PQexec(poConn, osCommand.c_str());
if (poResult == NULL ||
PQresultStatus(poResult) != PGRES_TUPLES_OK ||
PQntuples(poResult) <= 0 ) {
PQclear(poResult);
/**
* Maybe there is no primary key or unique constraint; a
* sequence will also suffice; get the first one
**/
osCommand.Printf("select cols.column_name from "
"information_schema.columns as cols join "
"information_schema.sequences as seqs on "
"cols.column_default like '%%'||seqs.sequence_name||'%%' "
"where cols.table_schema = '%s' and cols.table_name = '%s'",
pszSchema, pszTable);
#ifdef DEBUG_QUERY
CPLDebug("PostGIS_Raster",
"PostGISRasterDataset::GetPrimaryKeyRef(): Query: %s",
osCommand.c_str());
#endif
poResult = PQexec(poConn, osCommand.c_str());
if (poResult == NULL ||
PQresultStatus(poResult) != PGRES_TUPLES_OK ||
PQntuples(poResult) <= 0) {
CPLDebug("PostGIS_Raster",
"PostGISRasterDataset::GetPrimaryKeyRef(): Could not "
"find a primary key or unique column on the specified "
"table %s.%s. For better performance, creating a primary key on the table is advised.",
pszSchema, pszTable);
pszPrimaryKeyName = NULL; // Just in case
}
else {
pszPrimaryKeyName = CPLStrdup(PQgetvalue(poResult, 0, 0));
}
}
// Ok, get the primary key
else {
pszPrimaryKeyName = CPLStrdup(PQgetvalue(poResult, 0, 0));
bIsFastPK = true;
}
PQclear(poResult);
return pszPrimaryKeyName;
}
/***********************************************************************
* \brief Look for raster tables in database and store them as
* subdatasets
*
* If no table is provided in connection string, the driver looks for
* the existent raster tables in the schema given as argument. This
* argument, however, is optional. If a NULL value is provided, the
* driver looks for all raster tables in all schemas of the
* user-provided database.
*
* NOTE: Permissions are managed by libpq. The driver only returns an
* error if an error is returned when trying to access to tables not
* allowed to the current user.
**********************************************************************/
GBool PostGISRasterDataset::BrowseDatabase(const char* pszCurrentSchema,
const char* pszValidConnectionString) {
char* l_pszSchema = NULL;
char* l_pszTable = NULL;
char* l_pszColumn = NULL;
int i = 0;
int nTuples = 0;
PGresult * poResult = NULL;
CPLString osCommand;
/*************************************************************
* Fetch all the raster tables and store them as subdatasets
*************************************************************/
if (pszCurrentSchema == NULL) {
osCommand.Printf("select pg_namespace.nspname as schema, "
"pg_class.relname as table, pg_attribute.attname as column "
"from pg_class, pg_namespace,pg_attribute, pg_type where "
"pg_class.relnamespace = pg_namespace.oid and "
"pg_class.oid = pg_attribute.attrelid and "
"pg_attribute.atttypid = pg_type.oid and "
"pg_type.typname = 'raster'");
poResult = PQexec(poConn, osCommand.c_str());
if (poResult == NULL ||
PQresultStatus(poResult) != PGRES_TUPLES_OK ||
PQntuples(poResult) <= 0) {
ReportError(CE_Failure, CPLE_AppDefined,
"Error browsing database for PostGIS Raster tables: %s",
PQerrorMessage(poConn));
if (poResult != NULL)
PQclear(poResult);
return false;
}
nTuples = PQntuples(poResult);
for (i = 0; i < nTuples; i++) {
l_pszSchema = PQgetvalue(poResult, i, 0);
l_pszTable = PQgetvalue(poResult, i, 1);
l_pszColumn = PQgetvalue(poResult, i, 2);
papszSubdatasets = CSLSetNameValue(papszSubdatasets,
CPLSPrintf("SUBDATASET_%d_NAME", (i + 1)),
CPLSPrintf("PG:%s schema=%s table=%s column=%s",
pszValidConnectionString, l_pszSchema, l_pszTable,
l_pszColumn));
papszSubdatasets = CSLSetNameValue(papszSubdatasets,
CPLSPrintf("SUBDATASET_%d_DESC", (i + 1)),
CPLSPrintf("PostGIS Raster table at %s.%s (%s)",
l_pszSchema, l_pszTable, l_pszColumn));
}
PQclear(poResult);
}
/***************************************************************
* Fetch all the schema's raster tables and store them as
* subdatasets
**************************************************************/
else {
osCommand.Printf("select pg_class.relname as table, "
"pg_attribute.attname as column from pg_class, "
"pg_namespace,pg_attribute, pg_type where "
"pg_class.relnamespace = pg_namespace.oid and "
"pg_class.oid = pg_attribute.attrelid and "
"pg_attribute.atttypid = pg_type.oid and "
"pg_type.typname = 'raster' and "
"pg_namespace.nspname = '%s'", pszCurrentSchema);
poResult = PQexec(poConn, osCommand.c_str());
if (poResult == NULL ||
PQresultStatus(poResult) != PGRES_TUPLES_OK ||
PQntuples(poResult) <= 0) {
ReportError(CE_Failure, CPLE_AppDefined,
"Error browsing database for PostGIS Raster tables: %s",
PQerrorMessage(poConn));
if (poResult != NULL)
PQclear(poResult);
return false;
}
nTuples = PQntuples(poResult);
for (i = 0; i < nTuples; i++) {
l_pszTable = PQgetvalue(poResult, i, 0);
l_pszColumn = PQgetvalue(poResult, i, 1);
papszSubdatasets = CSLSetNameValue(papszSubdatasets,
CPLSPrintf("SUBDATASET_%d_NAME", (i + 1)),
CPLSPrintf("PG:%s schema=%s table=%s column=%s",
pszValidConnectionString, pszCurrentSchema, l_pszTable,
l_pszColumn));
papszSubdatasets = CSLSetNameValue(papszSubdatasets,
CPLSPrintf("SUBDATASET_%d_DESC", (i + 1)),
CPLSPrintf("PostGIS Raster table at %s.%s (%s)",
pszCurrentSchema, l_pszTable, l_pszColumn));
}
PQclear(poResult);
}
return true;
}
/***********************************************************************
* \brief Look for overview tables for the bands of the current dataset
**********************************************************************/
PROverview * PostGISRasterDataset::GetOverviewTables(int * pnOverviews)
{
PROverview * poOV = NULL;
CPLString osCommand;
PGresult * poResult = NULL;
osCommand.Printf("SELECT o_table_name, overview_factor, "
"o_raster_column, o_table_schema FROM raster_overviews "
"WHERE r_table_schema = '%s' AND r_table_name = '%s' AND "
"r_raster_column = '%s' ORDER BY overview_factor", this->pszSchema, this->pszTable,
this->pszColumn);
#ifdef DEBUG_QUERY
CPLDebug("PostGIS_Raster",
"PostGISRasterDataset::GetOverviewTables(): Query: %s",
osCommand.c_str());
#endif
poResult = PQexec(poConn, osCommand.c_str());
if (poResult == NULL ||
PQresultStatus(poResult) != PGRES_TUPLES_OK ||
PQntuples(poResult) < 0) {
ReportError(CE_Failure, CPLE_AppDefined,
"Error looking for overview tables: %s",
PQerrorMessage(poConn));
if (poResult)
PQclear(poResult);
return NULL;
}
else if (PQntuples(poResult) == 0) {
CPLDebug("PostGIS_Raster",
"PostGISRasterDataset::GetOverviewTables(): No overviews "
"for table %s.%s", pszTable, pszSchema);
if (poResult)
PQclear(poResult);
return NULL;
}
int nTuples = PQntuples(poResult);
poOV = (PROverview *)VSIMalloc2(nTuples, sizeof(PROverview));
if (poOV == NULL) {
ReportError(CE_Failure, CPLE_AppDefined,
"Error looking for overview tables");
PQclear(poResult);
return NULL;
}
int iOVerview = 0;
for(iOVerview = 0; iOVerview < nTuples; iOVerview++) {
poOV[iOVerview].pszSchema =
CPLStrdup(PQgetvalue(poResult, iOVerview, 3));
poOV[iOVerview].pszTable =
CPLStrdup(PQgetvalue(poResult, iOVerview, 0));
poOV[iOVerview].pszColumn =
CPLStrdup(PQgetvalue(poResult, iOVerview, 2));
poOV[iOVerview].nFactor =
atoi(PQgetvalue(poResult, iOVerview, 1));
}
if (pnOverviews)
*pnOverviews = nTuples;
PQclear(poResult);
return poOV;
}
/***********************************************************************
* \brief Build overview datasets
***********************************************************************/
void PostGISRasterDataset::BuildOverviews()
{
if( bHasBuiltOverviews || poParentDS != NULL )
return;
bHasBuiltOverviews = true;
/*******************************************************************
* We also get the names of the overview tables, if they exist. So,
* we'll can use them to create the overview datasets.
******************************************************************/
int nOV = 0;
PROverview * poOV = GetOverviewTables(&nOV);
if (poOV)
{
papoOverviewDS = (PostGISRasterDataset**) CPLCalloc(nOV, sizeof(PostGISRasterDataset*));
nOverviewCount = 0;
int iOV;
for(iOV = 0; iOV < nOV; iOV++)
{
PostGISRasterDataset* poOvrDS = new PostGISRasterDataset();
poOvrDS->nOverviewFactor = poOV[iOV].nFactor;
poOvrDS->poConn = poConn;
poOvrDS->eAccess = eAccess;
poOvrDS->nMode = nMode;
poOvrDS->pszSchema = poOV[iOV].pszSchema; // takes ownership
poOvrDS->pszTable = poOV[iOV].pszTable; // takes ownership
poOvrDS->pszColumn = poOV[iOV].pszColumn; // takes ownership
poOvrDS->pszWhere = pszWhere ? CPLStrdup(pszWhere) : NULL;
poOvrDS->poParentDS = this;
if (!CPLTestBool(CPLGetConfigOption("PG_DEFERRED_OVERVIEWS", "YES")) &&
(!poOvrDS->SetRasterProperties(NULL) ||
poOvrDS->GetRasterCount() != GetRasterCount()))
{
delete poOvrDS;
}
else
{
papoOverviewDS[nOverviewCount ++] = poOvrDS;
}
}
VSIFree(poOV);
}
}
/***********************************************************************
* \brief Returns overview count
***********************************************************************/
int PostGISRasterDataset::GetOverviewCount()
{
BuildOverviews();
return nOverviewCount;
}
/***********************************************************************
* \brief Returns overview dataset
***********************************************************************/
PostGISRasterDataset* PostGISRasterDataset::GetOverviewDS(int iOvr)
{
if( iOvr < 0 || iOvr > GetOverviewCount() )
return NULL;
return papoOverviewDS[iOvr];
}
/***********************************************************************
* \brief Calculates the destination window for a VRT source, taking
* into account that the source is a PostGIS Raster tile and the
* destination is the general dataset itself
*
* This method is adapted from gdalbuildvrt as is in GDAL 1.10.0
***********************************************************************/
GBool PostGISRasterDataset::GetDstWin(
PostGISRasterTileDataset * psDP,
int* pnDstXOff, int* pnDstYOff, int* pnDstXSize, int* pnDstYSize)
{
double we_res = this->adfGeoTransform[GEOTRSFRM_WE_RES];
double ns_res = this->adfGeoTransform[GEOTRSFRM_NS_RES];
double adfTileGeoTransform[6];
psDP->GetGeoTransform(adfTileGeoTransform);
*pnDstXOff = (int)
(0.5 + (adfTileGeoTransform[GEOTRSFRM_TOPLEFT_X] - xmin) / we_res);
if( ns_res < 0 )
*pnDstYOff = (int)
(0.5 + (ymax - adfTileGeoTransform[GEOTRSFRM_TOPLEFT_Y]) / -ns_res);
else
*pnDstYOff = (int)
(0.5 + (adfTileGeoTransform[GEOTRSFRM_TOPLEFT_Y] - ymin) / ns_res);
*pnDstXSize = (int)
(0.5 + psDP->GetRasterXSize() *
adfTileGeoTransform[GEOTRSFRM_WE_RES] / we_res);
*pnDstYSize = (int)
(0.5 + psDP->GetRasterYSize() *
adfTileGeoTransform[GEOTRSFRM_NS_RES] / ns_res);
return true;
}
/***********************************************************************
* \brief Add tiles bands as complex source for raster bands.
**********************************************************************/
GBool PostGISRasterDataset::AddComplexSource(PostGISRasterTileDataset* poRTDS)
{
// Parameters to add the tile bands as sources
int nDstXOff = 0;
int nDstYOff = 0;
int nDstXSize = 0;
int nDstYSize = 0;
// Get src and dst parameters
GBool bValidTile = GetDstWin(poRTDS,
&nDstXOff, &nDstYOff, &nDstXSize, &nDstYSize);
if (!bValidTile)
return false;
#ifdef DEBUG_VERBOSE
CPLDebug("PostGIS_Raster",
"PostGISRasterDataset::AddComplexSource: "
"Tile bounding box from (%d, %d) of size (%d, %d) will "
"cover raster bounding box from (%d, %d) of size "
"(%d, %d)", 0, 0,
poRTDS->GetRasterXSize(),
poRTDS->GetRasterYSize(),
nDstXOff, nDstYOff, nDstXSize, nDstYSize);
#endif
// Add tiles bands as sources for the raster bands
for(int iBand = 0; iBand < nBandsToCreate; iBand++)
{
PostGISRasterRasterBand * prb =
(PostGISRasterRasterBand *)GetRasterBand(iBand + 1);
int bHasNoData = FALSE;
double dfBandNoDataValue = prb->GetNoDataValue(&bHasNoData);
PostGISRasterTileRasterBand * prtb =
(PostGISRasterTileRasterBand *)
poRTDS->GetRasterBand(iBand + 1);
prb->AddComplexSource(prtb, 0, 0,
poRTDS->GetRasterXSize(),
poRTDS->GetRasterYSize(),
nDstXOff, nDstYOff, nDstXSize, nDstYSize,
0.0, 1.0,
(bHasNoData) ? dfBandNoDataValue : VRT_NODATA_UNSET);
prtb->poSource = prb->papoSources[prb->nSources-1];
}
return true;
}
/************************************************************************/
/* GetMatchingSourceRef() */
/************************************************************************/
/**
* \brief Get the tile dataset that matches the given upper left pixel
**/
PostGISRasterTileDataset *
PostGISRasterDataset::GetMatchingSourceRef(double dfUpperLeftX,
double dfUpperLeftY)
{
int i;
PostGISRasterTileDataset * poRTDS = NULL;
for(i = 0; i < m_nTiles; i++)
{
poRTDS = papoSourcesHolders[i];
if (CPLIsEqual(poRTDS->adfGeoTransform[GEOTRSFRM_TOPLEFT_X],
dfUpperLeftX) &&
CPLIsEqual(poRTDS->adfGeoTransform[GEOTRSFRM_TOPLEFT_Y],
dfUpperLeftY)) {
return poRTDS;
}
}
return NULL;
}
/************************************************************************/
/* CacheTile() */
/************************************************************************/
void PostGISRasterDataset::CacheTile(const char* pszMetadata,
const char* pszRaster,
const char *pszPKID,
int nBand,
int bAllBandCaching)
{
/**
* Get metadata record and unpack it
**/
char* pszRes = CPLStrdup(pszMetadata);
// Skip first "("
char* pszFilteredRes = pszRes + 1;
// Skip last ")"
pszFilteredRes[strlen(pszFilteredRes)-1] = '\0';
// Tokenize
char** papszParams =
CSLTokenizeString2(pszFilteredRes, ",",
CSLT_HONOURSTRINGS | CSLT_ALLOWEMPTYTOKENS);
CPLAssert(CSLCount(papszParams) >= ELEMENTS_OF_METADATA_RECORD);
CPLFree(pszRes);
double dfTilePixelSizeX = CPLAtof(papszParams[POS_UPPERLEFTX]);
double dfTilePixelSizeY = CPLAtof(papszParams[POS_UPPERLEFTY]);
int nTileXSize = atoi(papszParams[POS_WIDTH]);
int nTileYSize = atoi(papszParams[POS_HEIGHT]);
CSLDestroy(papszParams);
papszParams = NULL;
/**
* Get actual raster band data
**/
int nBandDataTypeSize = GDALGetDataTypeSize(GetRasterBand(nBand)->GetRasterDataType()) / 8;
int nExpectedBandDataSize =
nTileXSize * nTileYSize * nBandDataTypeSize;
int nWKBLength = 0;
GByte* pbyData = CPLHexToBinary(pszRaster, &nWKBLength);
int nExpectedBands = bAllBandCaching ? GetRasterCount() : 1;
int nExpectedWKBLength = RASTER_HEADER_SIZE + BAND_SIZE(nBandDataTypeSize, nExpectedBandDataSize) * nExpectedBands;
if( nWKBLength != nExpectedWKBLength )
{
CPLDebug("PostGIS_Raster", "nWKBLength=%d, nExpectedWKBLength=%d", nWKBLength, nExpectedWKBLength );
CPLFree(pbyData);
return;
}
// Do byte-swapping if necessary */
int bIsLittleEndian = (pbyData[0] == 1);
#ifdef CPL_LSB
int bSwap = !bIsLittleEndian;
#else
int bSwap = bIsLittleEndian;
#endif
PostGISRasterTileDataset* poRTDS = NULL;
if( GetPrimaryKeyRef() != NULL )
poRTDS = GetMatchingSourceRef(pszPKID);
else
poRTDS = GetMatchingSourceRef(dfTilePixelSizeX,
dfTilePixelSizeY);
if( poRTDS == NULL )
{
CPLFree(pbyData);
return;
}
for(int k=1; k <= nExpectedBands; k++)
{
GByte* pbyDataToRead = (GByte*)GET_BAND_DATA(pbyData, k,
nBandDataTypeSize, nExpectedBandDataSize);
if( bSwap && nBandDataTypeSize > 1 )
{
GDALSwapWords( pbyDataToRead, nBandDataTypeSize,
nTileXSize * nTileYSize,
nBandDataTypeSize );
}
/**
* Get the right PostGISRasterRasterBand
**/
int nCurBand = ( nExpectedBands > 1 ) ? k : nBand;
/**
* Get the right tileband
**/
GDALRasterBand * poRTB = poRTDS->GetRasterBand(nCurBand);
/**
* Manually add each tile data to the cache of the
* matching PostGISRasterTileRasterBand.
**/
if (poRTB)
{
GDALRasterBlock* poBlock = poRTB->GetLockedBlockRef(0, 0, TRUE);
if( poBlock != NULL )
{
// Point block data ref to fetched data
memcpy(poBlock->GetDataRef(), (void *)pbyDataToRead,
nExpectedBandDataSize);
poBlock->DropLock();
}
}
}
CPLFree(pbyData);
}
/************************************************************************/
/* LoadSources() */
/************************************************************************/
GBool PostGISRasterDataset::LoadSources(int nXOff, int nYOff, int nXSize, int nYSize, int nBand)
{
if( !bBuildQuadTreeDynamically )
return false;
CPLString osCommand;
CPLString osSpatialFilter;
CPLString osIDsToFetch;
PGresult * poResult;
int bFetchAll = FALSE;