Compensate for loss of Type 1 "Standard Symbols L" substitute for "Symbol"

At least for me on Linux since LO 5.3, 'soffice
sw/qa/extras/rtfexport/data/fdo72031.rtf' shows "Å" (rendered in "DejaVu Sans")
instead of "⊕" (rendered in "Standard Symbols L").  That's presumably because
47ea13ef8dc8ab9aeded6121845e3ebd1d28b292 "Kill the old Unix layout engines"
removed support for Type 1 fonts (see "Ignore Type 1 fonts" in
FontCfgWrapper::addFontSet, vcl/unx/generic/fontmanager/fontconfig.cxx), and my
(Fedora 25) /usr/share/fonts/default/Type1/s050000l.pfb "Standard Symbols L" is
a Type 1 font.  So we fell back to fontconfig's generic (weak) suggestion of
"DejaVu Sans" as a substitute for "Symbol".

So extend our fc_local.conf to suggest our "OpenSymbol" as a substitute for
"Symbol".

As that fc_local.conf was originally brought along by --with-fonts, which is
enabled by default but can be disabled, compilation of fc_local.conf from the
various snippets is moved to postprocess.

macOS and Windows were never affected, as they both come with a "Symbol" font
installed in the system.  (And we don't install fc_local.conf on Windows at
all.)

Change-Id: I8d6d87f24974577fd66f5f3989f606237ebb3d75
Reviewed-on: https://gerrit.libreoffice.org/42670
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>
Tested-by: Stephan Bergmann <sbergman@redhat.com>

3 files changed, 59 insertions, 0 deletions

diff --git a/postprocess/CustomTarget_fontconfig.mk b/postprocess/CustomTarget_fontconfig.mk
new file mode 100644
index 000000000000..72ff3f3cf1b0
--- /dev/null
+++ b/postprocess/CustomTarget_fontconfig.mk
@@ -0,0 +1,30 @@
+# -*- Mode: makefile-gmake; tab-width: 4; indent-tabs-mode: t; fill-column: 100 -*-
+#
+# This file is part of the LibreOffice project.
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+#
+
+$(eval $(call gb_CustomTarget_CustomTarget,postprocess/fontconfig))
+
+$(call gb_CustomTarget_get_workdir,postprocess/fontconfig)/fc_local.conf: \
+    $(SRCDIR)/extras/source/truetype/symbol/fc_local.snippet \
+    $(SRCDIR)/postprocess/CustomTarget_fontconfig.mk \
+    | $(call gb_CustomTarget_get_workdir,postprocess/fontconfig)/.dir
+
+ifneq ($(filter MORE_FONTS,$(BUILD_TYPE)),)
+$(call gb_CustomTarget_get_workdir,postprocess/fontconfig)/fc_local.conf: \
+    $(SRCDIR)/external/more_fonts/fc_local.snippet
+endif
+
+$(call gb_CustomTarget_get_workdir,postprocess/fontconfig)/fc_local.conf:
+	printf '<?xml version="1.0"?>\n<!DOCTYPE fontconfig SYSTEM "/etc/fonts/conf.d/fonts.dtd">\n<fontconfig>\n' >$@
+	cat $(SRCDIR)/extras/source/truetype/symbol/fc_local.snippet >>$@
+ifneq ($(filter MORE_FONTS,$(BUILD_TYPE)),)
+	cat $(SRCDIR)/external/more_fonts/fc_local.snippet >>$@
+endif
+	printf '</fontconfig>\n' >>$@
+
+# vim: set noet sw=4 ts=4:
diff --git a/postprocess/Module_postprocess.mk b/postprocess/Module_postprocess.mk
index 5775cfa795e1..d92a348e4142 100644
--- a/postprocess/Module_postprocess.mk
+++ b/postprocess/Module_postprocess.mk
@@ -28,6 +28,17 @@ $(eval $(call gb_Module_add_targets,postprocess,\
 ))
 endif
 
+# For non-WNT, add instdir/share/fonts/truetype/fc_local.conf when it shall
+# contain content from at least one of external/more_fonts/fc_local.snippet
+# (conditional on MORE_FONTS in BUILD_TYPE) and
+# extras/source/truetype/symbol/fc_local.snippet (unconditional):
+ifneq ($(OS),WNT)
+$(eval $(call gb_Module_add_targets,postprocess, \
+    CustomTarget_fontconfig \
+    Package_fontconfig \
+))
+endif
+
 $(eval $(call gb_Module_add_check_targets,postprocess,\
 	CppunitTest_services \
 ))
diff --git a/postprocess/Package_fontconfig.mk b/postprocess/Package_fontconfig.mk
new file mode 100644
index 000000000000..37f096e5028e
--- /dev/null
+++ b/postprocess/Package_fontconfig.mk
@@ -0,0 +1,18 @@
+# -*- Mode: makefile-gmake; tab-width: 4; indent-tabs-mode: t; fill-column: 100 -*-
+#
+# This file is part of the LibreOffice project.
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+#
+
+$(eval $(call gb_Package_Package,postprocess_fontconfig,$(call gb_CustomTarget_get_workdir,postprocess/fontconfig)))
+
+$(eval $(call gb_Package_add_files,postprocess_fontconfig,$(LIBO_SHARE_FOLDER)/fonts/truetype, \
+    fc_local.conf \
+))
+
+$(eval $(call gb_Package_use_custom_target,postprocess_fontconfig,postprocess/fontconfig))
+
+# vim: set noet sw=4 ts=4: