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Ignore overviews with 0 scale in pgraster

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refs #2551

Postgis raster_columns view is returning NULL values for raster
overviews with large scale factors. That issue in postgis is described
in http://trac.osgeo.org/postgis/ticket/3006

This causes two main problems:

  - The first overview with scale = NULL is wrongly chosen for rendering
    always

  - The messed up scaling factor causes the render symbolizer to spent
    an insane amount of CPU and memory to render a messed up tiles.

The patch in postgis is expected to be released with the new version, a
few months from now.
This commit is contained in:
Rafa de la Torre 2014-12-04 13:26:23 +00:00
parent ea61c5728d
commit c4684e09cd
1 changed files with 12 additions and 2 deletions
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14
plugins/input/pgraster/pgraster_datasource.cpp
View file

@ -352,12 +352,22 @@ pgraster_datasource::pgraster_datasource(parameters const& params)
shared_ptr<ResultSet> rs = conn->executeQuery(s.str());
while (rs->next())
{
overviews_.resize(overviews_.size()+1);
pgraster_overview& ov = overviews_.back();
pgraster_overview ov = pgraster_overview();
ov.schema = rs->getValue("sch");
ov.table = rs->getValue("tab");
ov.column = rs->getValue("col");
ov.scale = atof(rs->getValue("scl"));
if(ov.scale == 0.0f)
{
MAPNIK_LOG_WARN(pgraster) << "pgraster_datasource: found invalid overview "
<< ov.schema << "." << ov.table << "." << ov.column << " with scale " << ov.scale;
continue;
}
overviews_.push_back(ov);
MAPNIK_LOG_DEBUG(pgraster) << "pgraster_datasource: found overview " << ov.schema << "." << ov.table << "." << ov.column << " with scale " << ov.scale;
}
rs->close();