parse(t::Type{BlendMode}, keyword)
parse(t::Type{CompositeOperation}, keyword)

Parse a keyword string as a BlendMode or CompositeOperation. Keywords are case-insensitive, but hyphens cannot be omitted.

Examples

julia> parse(BlendMode, "color-burn")
BlendMode{Symbol("color-burn")}()

julia> parse(BlendMode, "soft-light") === BlendSoftLight
true

julia> parse(CompositeOperation, "source-over")
CompositeOperation{Symbol("source-over")}()

julia> parse(CompositeOperation, "source-over") === CompositeSourceOver
true

julia> parse(CompositeOperation, "SourceOver")
ERROR: ArgumentError: invalid keyword: SourceOver

blend(c1, c2; mode=BlendNormal, opacity=1, op=CompositeSourceOver)

Create the mixed color of two colors c1 and c2. The c1 means the backdrop color and the c2 means the source color.

mode specifies the blend mode, e.g. BlendMultiply.

opacity modifies the source (i.e. c2-side) alpha by multiplication.

op specifies the composite operations, e.g. CompositeSourceAtop.

The return type is the same as c1.

Examples

julia> blend(RGB(1, 0.5, 0), RGB(0, 0.5, 1), mode=BlendLighten)
RGB{Float64}(1.0,0.5,1.0)

keyword(mode::BlendMode)
keyword(op::CompositeOperation)

Return the keyword of mode or op as a string.

Example

julia> keyword(BlendColorDodge)
"color-dodge"

julia> keyword(CompositeSourceOver)
"source-over"