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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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18
include/mapnik/image_filter.hpp
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@ -409,7 +409,17 @@ 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;
@ -431,7 +441,7 @@ void apply_filter(Src & src, x_gradient)
rgba8_image_t temp_buffer(src_view.dimensions());
rgba8_view_t dst_view = view(temp_buffer);
x_gradient_impl(src_view, dst_view);
boost::gil::copy_pixels(view(temp_buffer), src_view);
}
@ -444,9 +454,9 @@ void apply_filter(Src & src, y_gradient)
(rgba8_pixel_t*) src.raw_data(),
src.width()*4);
rgba8_image_t temp_buffer(src_view.dimensions());
rgba8_view_t dst_view = view(temp_buffer);
rgba8_view_t dst_view = view(temp_buffer);
x_gradient_impl(rotated90ccw_view(src_view), rotated90ccw_view(dst_view));
boost::gil::copy_pixels(view(temp_buffer), src_view);
boost::gil::copy_pixels(view(temp_buffer), src_view);
}
template <typename Src>