doc: reinstate image maps

This fixes the errors during the compilation of Architecture.xml that
the .map files cannot be found. As a result, the architure diagrams
become clickable in the HTML document once again.

Signed-off-by: Pekka Paalanen <pq@iki.fi>

doc/publican/html/images/meson.build

@@ -25,4 +25,11 @@ foreach src : files([
 		install: true,
 		install_dir: publican_install_prefix + '/html/images',
 	)
+
+	publican_image_maps += custom_target(
+		input + '.map',
+		command: [ dot, '-Tcmapx_np', '-o@OUTPUT@', '@INPUT@' ],
+		input: input,
+		output: fs.stem(src) + '.map',
+	)
 endforeach

doc/publican/meson.build

@@ -4,6 +4,7 @@ merge_mapcoords_xsl = files('xsl/merge-mapcoords.xsl')
 to_publican_xsl = files('xsl/doxygen-to-publican.xsl')
 
 publican_inputs = []
+publican_image_maps = []
 
 foreach src : files([
 	'Wayland.xml', # must be first in publican_inputs
@@ -66,6 +67,9 @@ publican_inputs += custom_target(
 	output: 'ServerAPI.xml'
 )
 
+subdir('html/css')
+subdir('html/images')
+
 foreach src : files([
 	'Architecture.xml',
 	'Introduction.xml'
@@ -76,18 +80,16 @@ foreach src : files([
 		command: [
 			xsltproc,
 			'-o', '@OUTPUT@',
-			'--stringparam', 'basedir', '.',
+			'--stringparam', 'basedir', meson.current_build_dir() / 'html',
 			merge_mapcoords_xsl,
 			'@INPUT@',
 		],
-		input: [name],
+		input: src,
 		output: [name],
+		depends: publican_image_maps,
 	)
 endforeach
 
-subdir('html/css')
-subdir('html/images')
-
 custom_target(
 	'Wayland-docbook-html',
 	command: [