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fix typo (map_ext.intersects(map_ext) -> map_ext.intersects(layer_ext)) and add small optimization so that if projections are equal we don't check intersection twice before returning no hit

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This commit is contained in:
Dane Springmeyer 2011-07-21 21:14:06 +00:00
parent 572da8766f
commit c5c729b17c
1 changed files with 11 additions and 6 deletions
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9
include/mapnik/feature_style_processor.hpp
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@ -231,11 +231,16 @@ private:
// first, try to forward project map ext into layer srs
if (prj_trans.forward(map_ext) && map_ext.intersects(layer_ext))
{
{
layer_ext.clip(map_ext);
}
// if no intersection and projections are also equal, early return
else if (prj_trans.equal())
{
return;
}
// fallback to back projecting layer into map srs
else if (prj_trans.backward(layer_ext) && map_ext.intersects(map_ext))
else if (prj_trans.backward(layer_ext) && map_ext.intersects(layer_ext))
{
layer_ext.clip(map_ext);
// forward project layer extent back into native projection