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ensure we do not query layers with no active styles

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This commit is contained in:
Dane Springmeyer 2013-10-03 11:25:05 -07:00
parent 83fde93411
commit 879aec064a
1 changed files with 50 additions and 47 deletions
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59
include/mapnik/feature_style_processor_impl.hpp
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@ -301,16 +301,16 @@ void feature_style_processor<Processor>::prepare_layer(layer_rendering_material
unsigned int num_styles = style_names.size();
if (! num_styles)
{
MAPNIK_LOG_DEBUG(feature_style_processor) << "feature_style_processor: No style for layer=" << lay.name();
MAPNIK_LOG_DEBUG(feature_style_processor)
<< "feature_style_processor: No style for layer=" << lay.name();
return;
}
mapnik::datasource_ptr ds = lay.datasource();
if (! ds)
{
MAPNIK_LOG_DEBUG(feature_style_processor) << "feature_style_processor: No datasource for layer=" << lay.name();
MAPNIK_LOG_DEBUG(feature_style_processor)
<< "feature_style_processor: No datasource for layer=" << lay.name();
return;
}
@ -428,12 +428,6 @@ void feature_style_processor<Processor>::prepare_layer(layer_rendering_material
p.start_layer_processing(lay, layer_ext2);
double qw = query_ext.width()>0 ? query_ext.width() : 1;
double qh = query_ext.height()>0 ? query_ext.height() : 1;
query::resolution_type res(width/qw,
height/qh);
query q(layer_ext,res,scale_denom,extent);
boost::ptr_vector<rule_cache> & rule_caches = mat.rule_caches_;
attribute_collector collector(names);
@ -470,8 +464,18 @@ void feature_style_processor<Processor>::prepare_layer(layer_rendering_material
}
// Don't even try to do more work if there are no active styles.
if (active_styles.size() > 0)
if (active_styles.empty())
{
return;
}
double qw = query_ext.width()>0 ? query_ext.width() : 1;
double qh = query_ext.height()>0 ? query_ext.height() : 1;
query::resolution_type res(width/qw,
height/qh);
query q(layer_ext,res,scale_denom,extent);
if (p.attribute_collection_policy() == COLLECT_ALL)
{
layer_descriptor lay_desc = ds->get_descriptor();
@ -495,19 +499,17 @@ void feature_style_processor<Processor>::prepare_layer(layer_rendering_material
{
q.add_property_name(group_by);
}
}
bool cache_features = lay.cache_features() && active_styles.size() > 1;
std::string group_by = lay.group_by();
std::vector<featureset_ptr> & featureset_ptr_list = mat.featureset_ptr_list_;
if ( (group_by != "") || cache_features)
if (!group_by.empty() || cache_features)
{
featureset_ptr_list.push_back(ds->features_with_context(q,current_ctx));
}
else
{
for(size_t i = 0 ; i < active_styles.size(); i++)
for(size_t i = 0; i < active_styles.size(); ++i)
{
featureset_ptr_list.push_back(ds->features_with_context(q,current_ctx));
}
@ -516,13 +518,14 @@ void feature_style_processor<Processor>::prepare_layer(layer_rendering_material
template <typename Processor>
void feature_style_processor<Processor>::render_material(layer_rendering_material & mat, Processor & p )
void feature_style_processor<Processor>::render_material(layer_rendering_material & mat,
Processor & p )
{
std::vector<feature_type_style const*> & active_styles = mat.active_styles_;
std::vector<featureset_ptr> & featureset_ptr_list = mat.featureset_ptr_list_;
if (featureset_ptr_list.empty())
{
// The datasource wasn't querried because of early return
// The datasource wasn't queried because of early return
// but we have to apply compositing operations on styles
BOOST_FOREACH (feature_type_style const* style, active_styles)
{
@ -545,12 +548,12 @@ void feature_style_processor<Processor>::render_material(layer_rendering_materia
datasource_ptr ds = lay.datasource();
std::string group_by = lay.group_by();
// Render incrementally when the column that we group by
// changes value.
if (group_by != "")
// Render incrementally when the column that we group by changes value.
if (!group_by.empty())
{
featureset_ptr features = *featureset_ptr_list.begin();
if (features) {
if (features)
{
// Cache all features into the memory_datasource before rendering.
boost::shared_ptr<featureset_buffer> cache = boost::make_shared<featureset_buffer>();
feature_ptr feature, prev;
@ -570,7 +573,7 @@ void feature_style_processor<Processor>::render_material(layer_rendering_materia
rule_caches[i],
cache,
prj_trans);
i++;
++i;
}
cache->clear();
}
@ -583,7 +586,7 @@ void feature_style_processor<Processor>::render_material(layer_rendering_materia
{
cache->prepare();
render_style(p, style, rule_caches[i], cache, prj_trans);
i++;
++i;
}
cache->clear();
}
@ -592,7 +595,8 @@ void feature_style_processor<Processor>::render_material(layer_rendering_materia
{
boost::shared_ptr<featureset_buffer> cache = boost::make_shared<featureset_buffer>();
featureset_ptr features = *featureset_ptr_list.begin();
if (features) {
if (features)
{
// Cache all features into the memory_datasource before rendering.
feature_ptr feature;
while ((feature = features->next()))
@ -608,7 +612,7 @@ void feature_style_processor<Processor>::render_material(layer_rendering_materia
render_style(p, style,
rule_caches[i],
cache, prj_trans);
i++;
++i;
}
}
// We only have a single style and no grouping.
@ -623,10 +627,9 @@ void feature_style_processor<Processor>::render_material(layer_rendering_materia
rule_caches[i],
features,
prj_trans);
i++;
++i;
}
}
p.end_layer_processing(mat.lay_);
}
@ -652,7 +655,7 @@ void feature_style_processor<Processor>::render_style(
bool do_also = false;
BOOST_FOREACH(rule const* r, rc.get_if_rules() )
{
expression_ptr const& expr=r->get_filter();
expression_ptr const& expr = r->get_filter();
value_type result = boost::apply_visitor(evaluate<feature_impl,value_type>(*feature),*expr);
if (result.to_bool())
{