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+ handle boundary pixels in x/y gradients

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This commit is contained in:
Artem Pavlenko 2012-05-24 12:44:07 +01:00
parent 0542994c4d
commit bd25a9af92
1 changed files with 14 additions and 4 deletions
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10
include/mapnik/image_filter.hpp
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@ -410,6 +410,16 @@ void x_gradient_impl(Src const& src_view, Dst const& dst_view)
typename Src::x_iterator src_it = src_view.row_begin(y);
typename Dst::x_iterator dst_it = dst_view.row_begin(y);
dst_it[0][0] = 127 + (src_it[0][0] - src_it[1][0]) / 2;
dst_it[0][1] = 127 + (src_it[0][1] - src_it[1][1]) / 2;
dst_it[0][2] = 127 + (src_it[0][2] - src_it[1][2]) / 2;
dst_it[dst_view.width()-1][0] = 127 + (src_it[src_view.width()-2][0] - src_it[src_view.width()-1][0]) / 2;
dst_it[dst_view.width()-1][1] = 127 + (src_it[src_view.width()-2][1] - src_it[src_view.width()-1][1]) / 2;
dst_it[dst_view.width()-1][2] = 127 + (src_it[src_view.width()-2][2] - src_it[src_view.width()-1][2]) / 2;
dst_it[0][3] = dst_it[src_view.width()-1][3] = 255;
for (int x=1; x<src_view.width()-1; ++x)
{
dst_it[x][0] = 127 + (src_it[x-1][0] - src_it[x+1][0]) / 2;