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LibWeb+LibGfx: Move premultiplied alpha mixing to color.mixed_with()

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This will be needed for mixing filters in LibGfx (and may be
generally useful elsewhere).
This commit is contained in:
MacDue 2022-09-15 08:31:22 +01:00 • committed by Sam Atkins
parent ec4de1e07d
commit 7bc0c66290
3 changed files with 33 additions and 35 deletions
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2
Userland/Libraries/LibGfx/Color.h
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@ -235,6 +235,8 @@ public:
#endif
}
Color mixed_with(Color const& other, float weight) const;
Color interpolate(Color const& other, float weight) const noexcept
{
u8 r = red() + round_to<u8>(static_cast<float>(other.red() - red()) * weight);