x11-libs/gdk-pixbuf: rework gtk-doc handling, use builtin jpeg, etc

* gdk-pixbuf contains pregenerated gtk-docs, so just install those to
  the place where our devhelp will actually find them too
* Build jpeg support into gdk-pixbuf instead of a module, as upstream
  has started doing so by default as well. With USE=-jpeg it'll work
  as needed, as it's not part of enabled loaders then
* Add missing einstalldocs for NEWS and co
* Always depend on docbook-xml-dtd, as needed for manpage generation
* Drop old meson minimum requirement as meson.eclass requires much
  newer by now

Closes: https://bugs.gentoo.org/809794
Closes: https://bugs.gentoo.org/811201
Package-Manager: Portage-3.0.20, Repoman-3.0.2
Signed-off-by: Mart Raudsepp <leio@gentoo.org>

x11-libs/gdk-pixbuf/gdk-pixbuf-2.42.6-r1.ebuild

@@ -0,0 +1,116 @@
+# Copyright 1999-2021 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+inherit gnome.org gnome2-utils meson-multilib multilib xdg
+
+DESCRIPTION="Image loading library for GTK+"
+HOMEPAGE="https://gitlab.gnome.org/GNOME/gdk-pixbuf"
+
+LICENSE="LGPL-2.1+"
+SLOT="2"
+KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~m68k ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86 ~amd64-linux ~x86-linux ~ppc-macos ~x64-macos ~sparc-solaris ~sparc64-solaris ~x64-solaris ~x86-solaris"
+IUSE="+introspection jpeg tiff"
+
+# TODO: For windows/darwin support: shared-mime-info conditional, native_windows_loaders option review
+DEPEND="
+	>=dev-libs/glib-2.56.0:2[${MULTILIB_USEDEP}]
+	x11-misc/shared-mime-info
+	>=media-libs/libpng-1.4:0=[${MULTILIB_USEDEP}]
+	jpeg? ( virtual/jpeg:0=[${MULTILIB_USEDEP}] )
+	tiff? ( >=media-libs/tiff-3.9.2:0=[${MULTILIB_USEDEP}] )
+	introspection? ( >=dev-libs/gobject-introspection-1.54:= )
+"
+RDEPEND="${DEPEND}
+	!<x11-libs/gtk+-2.90.4:3
+"
+BDEPEND="
+	app-text/docbook-xsl-stylesheets
+	app-text/docbook-xml-dtd:4.3
+	dev-libs/glib:2
+	dev-libs/libxslt
+	dev-util/glib-utils
+	>=sys-devel/gettext-0.19.8
+	virtual/pkgconfig
+"
+
+MULTILIB_CHOST_TOOLS=(
+	/usr/bin/gdk-pixbuf-query-loaders$(get_exeext)
+)
+
+PATCHES=(
+	# Do not run lowmem test on uclibc
+	# See https://bugzilla.gnome.org/show_bug.cgi?id=756590
+	"${FILESDIR}"/${PN}-2.32.3-fix-lowmem-uclibc.patch
+)
+
+src_prepare() {
+	xdg_src_prepare
+	# This will avoid polluting the pkg-config file with versioned libpng,
+	# which is causing problems with libpng14 -> libpng15 upgrade
+	# See upstream bug #667068
+	# First check that the pattern is present, to catch upstream changes on bumps,
+	# because sed doesn't return failure code if it doesn't do any replacements
+	grep -q "foreach png: \[ 'libpng16', 'libpng15', 'libpng14', 'libpng13', 'libpng12', 'libpng10' \]" meson.build || die "libpng check order has changed upstream"
+	sed -e "s/foreach png: \[ 'libpng16', 'libpng15', 'libpng14', 'libpng13', 'libpng12', 'libpng10' \]/foreach png: \[ 'libpng', 'libpng16', 'libpng15', 'libpng14', 'libpng13', 'libpng12', 'libpng10' \]/" -i meson.build || die
+}
+
+multilib_src_configure() {
+	local emesonargs=(
+		-Dpng=true
+		$(meson_use tiff)
+		$(meson_use jpeg)
+		-Dbuiltin_loaders=png,jpeg
+		-Drelocatable=false
+		#native_windows_loaders
+		-Dinstalled_tests=false
+		-Dgio_sniffing=true
+		-Dgtk_doc=false
+		$(meson_native_use_feature introspection)
+		$(meson_native_true man)
+	)
+
+	meson_src_configure
+}
+
+multilib_src_install_all() {
+	einstalldocs
+	insinto /usr/share/gtk-doc/html
+	doins -r "${S}"/docs/gdk-pixbuf
+	doins -r "${S}"/docs/gdk-pixdata
+}
+
+pkg_preinst() {
+	xdg_pkg_preinst
+
+	multilib_pkg_preinst() {
+		# Make sure loaders.cache belongs to gdk-pixbuf alone
+		local cache="usr/$(get_libdir)/${PN}-2.0/2.10.0/loaders.cache"
+
+		if [[ -e ${EROOT}/${cache} ]]; then
+			cp "${EROOT}"/${cache} "${ED}"/${cache} || die
+		else
+			touch "${ED}"/${cache} || die
+		fi
+	}
+
+	multilib_foreach_abi multilib_pkg_preinst
+	gnome2_gdk_pixbuf_savelist
+}
+
+pkg_postinst() {
+	# causes segfault if set, see bug 375615
+	unset __GL_NO_DSO_FINALIZER
+
+	xdg_pkg_postinst
+	multilib_foreach_abi gnome2_gdk_pixbuf_update
+}
+
+pkg_postrm() {
+	xdg_pkg_postrm
+
+	if [[ -z ${REPLACED_BY_VERSION} ]]; then
+		rm -f "${EROOT}"/usr/lib*/${PN}-2.0/2.10.0/loaders.cache
+	fi
+}