plutosvg: add SVG rendering library

Parses SVG and draws it through plutovg, which lets a theme ship its
artwork as text rather than as rendered bitmaps. 33 KiB on aarch64, and
it needs nothing beyond plutovg and libc.

freetype is disabled: it only serves OpenType SVG glyphs, and pulling it
in for that would outweigh the library several times over. The bundled
plutovg wrap is refused so a failed dependency check cannot stage a
second copy over the packaged one.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

libs/plutosvg/Makefile

@@ -0,0 +1,57 @@
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=plutosvg
+PKG_VERSION:=0.0.8
+PKG_RELEASE:=1
+
+PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
+PKG_SOURCE_URL:=https://codeload.github.com/sammycage/plutosvg/tar.gz/v$(PKG_VERSION)?
+PKG_HASH:=49d5cfe772d3aa10cd4879f2f6e189f5083c08e4c8ea01bf3d5b87c97dfca7d2
+
+PKG_MAINTAINER:=Daniel Golle <daniel@makrotopia.org>
+PKG_LICENSE:=MIT
+PKG_LICENSE_FILES:=LICENSE
+
+PKG_INSTALL:=1
+PKG_BUILD_PARALLEL:=1
+
+include $(INCLUDE_DIR)/package.mk
+include $(INCLUDE_DIR)/meson.mk
+
+# plutosvg ships subprojects/plutovg.wrap and declares it as a fallback,
+# so a failed dependency check would quietly build and stage a second
+# copy of plutovg over the packaged one.
+MESON_ARGS += \
+	--wrap-mode=nofallback \
+	-Dexamples=disabled \
+	-Dtests=disabled \
+	-Dfreetype=disabled
+
+define Package/plutosvg
+  SECTION:=libs
+  CATEGORY:=Libraries
+  TITLE:=SVG rendering library
+  URL:=https://github.com/sammycage/plutosvg
+  DEPENDS:=+plutovg
+endef
+
+define Package/plutosvg/description
+  Parses SVG documents and renders them through plutovg. Built without
+  the optional freetype support, which only serves OpenType SVG glyphs.
+endef
+
+define Build/InstallDev
+	$(INSTALL_DIR) $(1)/usr/include
+	$(CP) $(PKG_INSTALL_DIR)/usr/include/plutosvg $(1)/usr/include/
+	$(INSTALL_DIR) $(1)/usr/lib
+	$(CP) $(PKG_INSTALL_DIR)/usr/lib/libplutosvg.so* $(1)/usr/lib/
+	$(INSTALL_DIR) $(1)/usr/lib/pkgconfig
+	$(CP) $(PKG_INSTALL_DIR)/usr/lib/pkgconfig/plutosvg.pc $(1)/usr/lib/pkgconfig/
+endef
+
+define Package/plutosvg/install
+	$(INSTALL_DIR) $(1)/usr/lib
+	$(CP) $(PKG_INSTALL_DIR)/usr/lib/libplutosvg.so.* $(1)/usr/lib/
+endef
+
+$(eval $(call BuildPackage,plutosvg))