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backport canvas color functions from Mixbus

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This commit is contained in:
Robin Gareus 2016-05-17 18:17:51 +02:00
parent 8fc5b5c060
commit 742e113a7b
2 changed files with 8 additions and 0 deletions
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7
libs/canvas/colors.cc
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@ -658,3 +658,10 @@ SVAModifier::operator () (HSV& hsv) const
return r;
}
ArdourCanvas::Color
ArdourCanvas::color_at_alpha (ArdourCanvas::Color c, double a)
{
double r, g, b, unused;
color_to_rgba (c, r, g, b, unused);
return rgba_to_color( r,g,b, a );
}