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apply constness

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This commit is contained in:
artemp 2015-05-14 10:45:34 +01:00
parent 78c56968c1
commit e20ae67110
1 changed files with 2 additions and 2 deletions
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4
src/image_util.cpp
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@ -639,7 +639,7 @@ struct visitor_set_alpha
visitor_set_alpha(float opacity)
: opacity_(clamp(opacity, 0.0f, 1.0f)) {}
void operator() (image_rgba8 & data)
void operator() (image_rgba8 & data) const
{
using pixel_type = image_rgba8::pixel_type;
pixel_type a1 = static_cast<pixel_type>(255.0 * opacity_);
@ -662,7 +662,7 @@ struct visitor_set_alpha
}
template <typename T>
void operator() (T & data)
void operator() (T & data) const
{
throw std::runtime_error("Error: set_alpha with " + std::string(typeid(data).name()) + " is not supported");
}