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hextree - avoid quantizing images with less than 3 pixels (hextree implementation requirement)

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This commit is contained in:
artemp 2014-08-21 12:43:43 +01:00
parent a4cd4821a0
commit 8db68fc5e3
1 changed files with 33 additions and 28 deletions
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9
include/mapnik/png_io.hpp
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@ -654,7 +654,8 @@ void save_as_png8_hex(T1 & file,
{
unsigned width = image.width();
unsigned height = image.height();
if (width + height > 3) // at least 3 pixels (hextree implementation requirement)
{
// structure for color quantization
hextree<mapnik::rgba> tree(opts.colors);
if (opts.trans_mode >= 0)
@ -686,8 +687,12 @@ void save_as_png8_hex(T1 & file,
palette.push_back(rgb(pal[i].r, pal[i].g, pal[i].b));
alphaTable.push_back(pal[i].a);
}
save_as_png8<T1, T2, hextree<mapnik::rgba> >(file, image, tree, palette, alphaTable, opts);
}
else
{
throw std::runtime_error("Can't quantize images with less than 3 pixels");
}
}
template <typename T1, typename T2>