Add very basic SVG support

We need to refactor, so that SVGs are pre-rendered on each change
of scaling by librsvg directly, because some elements may be rasterized.

It would be best to also support building against resvg.

meson.build

@@ -2,12 +2,14 @@ project('fastiv', 'c', default_options : ['c_std=gnu99'], version : '0.1.0')
 
 # TODO(p): Use libraw_r later, when we start parallelizing/preloading.
 libraw = dependency('libraw', required : get_option('libraw'))
+librsvg = dependency('librsvg-2.0', required : get_option('librsvg'))
 dependencies = [
 	dependency('gtk+-3.0'),
 	dependency('libturbojpeg'),
 	dependency('libpng', version : '>=1.5.4'),
 	dependency('pixman-1'),
 	libraw,
+	librsvg,
 	meson.get_compiler('c').find_library('m', required : false),
 ]
 
@@ -15,6 +17,7 @@ conf = configuration_data()
 conf.set_quoted('PROJECT_NAME', meson.project_name())
 conf.set_quoted('PROJECT_VERSION', meson.project_version())
 conf.set('HAVE_LIBRAW', libraw.found())
+conf.set('HAVE_LIBRSVG', librsvg.found())
 configure_file(
 	output : 'config.h',
 	configuration : conf,