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fixed color quantization in case of one color and transparency. #539

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This commit is contained in:
Marcin Rudowski 2010-03-24 17:19:33 +00:00
parent 75dc292eb9
commit 8369278662
1 changed files with 4 additions and 2 deletions
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6
include/mapnik/hextree.hpp
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@ -263,8 +263,10 @@ public:
{
byte a = preprocessAlpha(c.a);
unsigned ind=0;
if (a < InsertPolicy::MIN_ALPHA || colors_ <= 1)
if (a < InsertPolicy::MIN_ALPHA || colors_ == 0)
return 0;
if (colors_ == 1)
return pal_remap_[has_hole_?1:0];
rgba_hash_table::iterator it = color_hashmap_.find(c);
if (it == color_hashmap_.end())
@ -472,7 +474,7 @@ private:
}
tries=0;
// ignore leaves and also nodes with small mean error and not excessive number of pixels
if (cur_node->reduce_cost / cur_node->pixel_count * std::log(long(cur_node->pixel_count)) > 20
if ((cur_node->reduce_cost / cur_node->pixel_count + 1) * std::log(long(cur_node->pixel_count)) > 15
&& cur_node->children_count > 0)
{
colors_--;