wrap set_metadata and set_custom_metadata

Project.toml

@@ -11,7 +11,7 @@ Libdl = "8f399da3-3557-5675-b5ff-fb832c97cbdb"
 Pango_jll = "36c8627f-9965-5494-a995-c6b170f724f3"
 
 [compat]
-Cairo_jll = "1.16"
+Cairo_jll = "1.18"
 Colors = "0.12, 0.13"
 Glib_jll = "2.59.0"
 Graphics = "1"

src/Cairo.jl

@@ -339,6 +339,16 @@ function CairoPDFSurface(filename::AbstractString, w_pts::Real, h_pts::Real)
     CairoSurface(ptr, w_pts, h_pts)
 end
 
+function set_metadata(surf, metadata_type, str)
+    ccall((:cairo_pdf_surface_set_metadata,libcairo), Cvoid,
+          (Ptr{Nothing}, Cint, Cstring), surf.ptr, metadata_type, str)
+end
+
+function set_custom_metadata(surf, name, value)
+    ccall((:cairo_pdf_surface_set_custom_metadata,libcairo), Cvoid,
+          (Ptr{Nothing}, Cstring, Cstring), surf.ptr, name, value)
+end
+
 ## EPS ##
 
 function CairoEPSSurface(stream::T, w::Real, h::Real) where {T<:IO}

src/constants.jl

@@ -64,7 +64,14 @@ const STATUS_DEVICE_TYPE_MISMATCH      = Int32(33)
 const STATUS_DEVICE_ERROR              = Int32(34)
 const STATUS_INVALID_MESH_CONSTRUCTION = Int32(35)
 const STATUS_DEVICE_FINISHED           = Int32(36)
-const STATUS_LAST_STATUS               = Int32(37)
+const STATUS_JBIG2_GLOBAL_MISSING      = Int32(37)
+const STATUS_PNG_ERROR                 = Int32(38)
+const STATUS_FREETYPE_ERROR            = Int32(39)
+const STATUS_WIN32_GDI_ERROR           = Int32(40)
+const STATUS_TAG_ERROR                 = Int32(41)
+const STATUS_DWRITE_ERROR              = Int32(42)
+const STATUS_SVG_FONT_ERROR            = Int32(43)
+const STATUS_LAST_STATUS               = Int32(44)
 
 const surface_t = Int32
 const CAIRO_SURFACE_TYPE_IMAGE            = Int32(0)
@@ -148,6 +155,13 @@ const OPERATOR_OVERLAY = 16
 const OPERATOR_DARKEN = 17
 const OPERATOR_LIGHTEN = 18
 
+const PDF_METADATA_TITLE = 0
+const PDF_METADATA_AUTHOR = 1
+const PDF_METADATA_SUBJECT = 2
+const PDF_METADATA_KEYWORDS = 3
+const PDF_METADATA_CREATOR = 4
+const PDF_METADATA_CREATE_DATE = 5
+const PDF_METADATA_MOD_DATE = 6
 
 ## LaTex Token Dicts ##
 const _common_token_dict = Dict(

test/runtests.jl

@@ -166,6 +166,8 @@ end
     output_file_name = "a.pdf"
     surf = CairoPDFSurface(output_file_name,512,512)
     hdraw(surf,64,8,4)
+    Cairo.set_metadata(surf, Cairo.PDF_METADATA_CREATOR, "Cairo.jl")
+    Cairo.set_custom_metadata(surf, "id", "42")
     finish(surf)
 
     @test isfile(output_file_name)