steal some color conversions from GtkObservables

I think these belong in Gtk4
JuliaGtk · Sep 16, 2023 · a85094f · a85094f
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commit a85094f
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diff --git a/Project.toml b/Project.toml
@@ -7,6 +7,7 @@ BitFlags = "d1d4a3ce-64b1-5f1a-9ba4-7e7e69966f35"
 CEnum = "fa961155-64e5-5f13-b03f-caf6b980ea82"
 Cairo = "159f3aea-2a34-519c-b102-8c37f9878175"
 Cairo_jll = "83423d85-b0ee-5818-9007-b63ccbeb887a"
+ColorTypes = "3da002f7-5984-5a60-b8a6-cbb66c0b333f"
 GTK4_jll = "6ebb71f1-8434-552f-b6b1-dc18babcca63"
 Glib_jll = "7746bdde-850d-59dc-9ae8-88ece973131d"
 Graphene_jll = "75302f13-0b7e-5bab-a6d1-23fa92e4c2ea"
@@ -28,6 +29,7 @@ BitFlags = "0.1.5"
 CEnum = "0.4.2"
 Cairo = "1.0.0"
 Cairo_jll = "1.16.0"
+ColorTypes = "0.10, 0.11"
 GTK4_jll = "4.6.0"
 Glib_jll = "2.74.0"
 Graphene_jll = "1.10"

diff --git a/src/Gdk4.jl b/src/Gdk4.jl
@@ -18,6 +18,9 @@ function GdkRGBA(rgba::AbstractString)
    r
 end
 
+convert(::Type{RGBA}, gcolor::Gtk4.GdkRGBA) = RGBA(gcolor.red, gcolor.green, gcolor.blue, gcolor.alpha)
+convert(::Type{Gtk4.GdkRGBA}, color::Colorant) = Gtk4.GdkRGBA(red(color), green(color), blue(color), alpha(color))
+
 ## GdkCursor
 
 GdkCursor(name::AbstractString; kwargs...) = GdkCursor(name, nothing; kwargs...)

diff --git a/src/Gtk4.jl b/src/Gtk4.jl
@@ -10,6 +10,7 @@ end
 
 import CEnum: @cenum
 import BitFlags: @bitflag
+import ColorTypes: Colorant, RGBA
 
 include("GLib/GLib.jl")
 include("Pango/Pango.jl")