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+ add feature caching support when multiple styles are

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specified for the same layer. This should reduce
  I/O for complex styles and make multiple styles per
  layer a relatively cheap op. TODO: tweak memory_datasource
  impl.
This commit is contained in:
Artem Pavlenko 2010-07-15 12:35:25 +00:00
parent d273101adc
commit 3d888515b3
1 changed files with 22 additions and 2 deletions
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24
include/mapnik/feature_style_processor.hpp
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@ -35,6 +35,7 @@
#include <mapnik/utils.hpp>
#include <mapnik/projection.hpp>
#include <mapnik/scale_denominator.hpp>
#include <mapnik/memory_datasource.hpp>
#ifdef MAPNIK_DEBUG
//#include <mapnik/wall_clock_timer.hpp>
@ -177,7 +178,10 @@ private:
std::vector<std::string> const& style_names = lay.styles();
std::vector<std::string>::const_iterator stylesIter = style_names.begin();
std::vector<std::string>::const_iterator stylesEnd = style_names.end();
std::vector<std::string>::const_iterator stylesEnd = style_names.end();
memory_datasource cache;
bool cache_features = style_names.size()>1?true:false;
bool first = true;
for (;stylesIter != stylesEnd; ++stylesIter)
{
std::set<std::string> names;
@ -256,13 +260,28 @@ private:
}
if (active_rules)
{
featureset_ptr fs=ds->features(q);
featureset_ptr fs;
if (first)
{
first = false;
fs = ds->features(q);
}
else
{
fs = cache.features(q);
}
if (fs)
{
feature_ptr feature;
while ((feature = fs->next()))
{
bool do_else=true;
if (cache_features)
{
cache.push(feature);
}
std::vector<rule_type*>::const_iterator itr=if_rules.begin();
std::vector<rule_type*>::const_iterator end=if_rules.end();
for (;itr != end;++itr)
@ -303,6 +322,7 @@ private:
}
}
}
cache_features = false;
}
}
}