Enum Enums.BlendMode

public enum Enums.BlendMode

The Cairo docs have a nice explanation of all the blend modes: https://www.cairographics.org/operators

The non-separable modes are not implemented.

Name	Description
Add	A bit like adding the two images.
Atop	This leaves the first object mostly intact, but mixes both objects in the overlapping area.
Clear	Where the second object is drawn, the first is removed.
ColourBurn	Darken first by a factor of second.
ColourDodge	Brighten first by a factor second.
Darken	The darker of each component.
Dest	Leaves the first object untouched, the second is discarded completely.
DestAtop	Like Atop, but swaps the arguments.
DestIn	Like In, but swaps the arguments.
DestOut	Like Out, but swaps the arguments.
DestOver	Like Over, but swaps the arguments.
Difference	Difference of the two.
Exclusion	Somewhat like Difference, but lower-contrast.
HardLight	Multiply or screen, depending on lightness.
In	The first object is removed completely, the second is only drawn where the first was.
Lighten	The lighter of each component.
Multiply	At least as dark as the darker of the two inputs.
Out	The second is drawn only where the first isn't.
Over	The image shows what you would expect if you held two semi-transparent slides on top of each other.
Overlay	Multiplies or screens colors, depending on the lightness.
Saturate	A bit like the darker of the two.
Screen	At least as light as the lighter of the inputs.
SoftLight	Darken or lighten, depending on lightness.
Source	The second object is drawn as if nothing were below.
Xor	Something like a difference operator.