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grid_vertex_converter: Fix handling of empty polygon

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This commit is contained in:
Jiri Drbalek 2018-02-13 14:13:34 +00:00
parent a602c65354
commit 2f2dcf1eea
1 changed files with 19 additions and 14 deletions
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33
include/mapnik/grid_vertex_converter.hpp
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@ -168,14 +168,17 @@ private:
double get_hit_bitmap_scale(box2d<T> const& envelope) const
{
T size = envelope.width() * envelope.height();
// Polygon with huge area can lead to excessive memory allocation.
// This is more or less arbitrarily chosen limit for the maximum bitmap resolution.
// Bitmap bigger than this limit is scaled down to fit into this resolution.
const std::size_t max_size = 8192 * 8192;
if (size > max_size)
if (envelope.valid())
{
return std::sqrt(max_size / size);
T size = envelope.width() * envelope.height();
// Polygon with huge area can lead to excessive memory allocation.
// This is more or less arbitrarily chosen limit for the maximum bitmap resolution.
// Bitmap bigger than this limit is scaled down to fit into this resolution.
const std::size_t max_size = 8192 * 8192;
if (size > max_size)
{
return std::sqrt(max_size / size);
}
}
return 1;
}
@ -212,15 +215,17 @@ private:
double scale_factor) const
{
mapnik::geometry::point<T> interior;
if (!mapnik::geometry::interior(poly, scale_factor, interior))
if (envelope.valid())
{
auto center = envelope.center();
interior.x = center.x;
interior.y = center.y;
if (!mapnik::geometry::interior(poly, scale_factor, interior))
{
auto center = envelope.center();
interior.x = center.x;
interior.y = center.y;
}
vt_.forward(&interior.x, &interior.y);
}
vt_.forward(&interior.x, &interior.y);
return interior;
}