build/windows: generate a default XCF file to be copied by Windows

Attribute uap4:ShellNewFileName is meant as a template file to be copied when
someone initiate the Shell "New" command (via the Explorer context menu).

build/windows/gitlab-ci/4_dist-gimp-winsdk.ps1

@@ -82,6 +82,7 @@ if (Test-Path -Path "$icons_path")
       {
         New-Item -ItemType Directory -Path "$arch\Assets\"
         Copy-Item -Path "$icons_path\*.png" -Destination "$arch\Assets\" -Recurse
+        Copy-Item -Path "$icons_path\*.xcf" -Destination "$arch\Assets\" -Recurse
       }
   }
 else

build/windows/store/AppxManifest.xml

@@ -45,7 +45,7 @@
             <uap:DisplayName>eXperimental Computing Facility file</uap:DisplayName>
             <uap:Logo>Assets\fileicon.png</uap:Logo>
             <uap:SupportedFileTypes>
-              <uap:FileType>.xcf</uap:FileType>
+              <uap:FileType uap4:ShellNewFileName="Assets\New_GIMP_Project.xcf" uap4:ShellNewDisplayName="GIMP project file">.xcf</uap:FileType>
             </uap:SupportedFileTypes>
           </uap3:FileTypeAssociation>
         </uap3:Extension>

build/windows/store/Assets/gen-new-xcf.py.in

@@ -0,0 +1,25 @@
+import os
+import sys
+
+output_path = '@BUILDDIR@/New_GIMP_Project.xcf'
+default_width  = 1920
+default_height = 1080
+image = Gimp.Image.new(default_width, default_height, Gimp.ImageBaseType.RGB)
+layer = Gimp.Layer.new(image, None, default_width, default_height,
+                       Gimp.ImageType.RGB_IMAGE, 100.0, Gimp.LayerMode.NORMAL)
+layer.fill(Gimp.FillType.WHITE)
+image.insert_layer(layer, None, 0)
+
+procedure = Gimp.get_pdb().lookup_procedure("gimp-xcf-save")
+config    = procedure.create_config()
+drawables = image.list_selected_drawables()
+config.set_property("image", image)
+config.set_property("num-drawables", len(drawables))
+config.set_property("drawables", Gimp.ObjectArray.new(Gimp.Drawable, drawables, False))
+config.set_property("file", Gio.file_new_for_path(output_path))
+Gimp.Procedure.run(procedure, config)
+
+v = Gimp.Procedure.run(procedure, config)
+
+if v.index(0) != Gimp.PDBStatusType.SUCCESS:
+  sys.exit(os.EX_SOFTWARE)

build/windows/store/Assets/meson.build

@@ -248,3 +248,27 @@ foreach scale : scales
                             build_by_default: true,
                             env: gimp_run_env)
 endforeach
+
+
+# OTHER ASSETS
+
+## Generate default XCF file (uap4:ShellNewFileName)
+gen_new_xcf_conf = configuration_data()
+gen_new_xcf_conf.set('BUILDDIR', meson.current_build_dir())
+gen_new_xcf_py = configure_file(
+  input : 'gen-new-xcf.py.in',
+  output : 'gen-new-xcf.py',
+  configuration : gen_new_xcf_conf
+)
+
+xcf_file = custom_target('New_GIMP_Project.xcf',
+  input : [ gen_new_xcf_py ],
+  depend_files: [ wilber_path ],
+  output: [ 'New_GIMP_Project.xcf', ],
+  command: [ gimp_exe, '-nidfs',
+             '--batch-interpreter', 'python-fu-eval',
+             '-b', '-', '--quit'],
+  feed: true,
+  build_by_default: true,
+  env: gimp_run_env
+)