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add missing image_width fix

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Artem Pavlenko 2012-02-22 22:46:35 +00:00
parent 5b49d64a48
commit 00abb57ffa
1 changed files with 1 additions and 1 deletions
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include/mapnik/png_io.hpp
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@ -487,7 +487,7 @@ void save_as_png8(T1 & file, T2 const& image, T3 const & tree,
else
{
// <=16 colors -> write 4-bit color depth PNG
unsigned image_width = (int(0.5*width) + 3)&~3;
unsigned image_width = width > 3 ? (int(0.5*width) + 3)&~3 : 4;
unsigned image_height = height;
image_data_8 reduced_image(image_width, image_height);
for (unsigned y = 0; y < height; ++y)