Support for rendering Kate streams with libtiger

libtiger is a rendering library for Kate streams based on Pango
and Cairo, and supports almost everything Kate streams can do.

There's a bit of wonkiness with rendering on regions as VLC then
blends them onto a subsampled YUV buffer, and colors can bleed
in a not so nice way. I've tried frobbing the blender in blend.c
and I got rid of the chroma bleeding, but at the cost of other
artifacts, so I'm leaving it out.

Also, I can't find a way to get the preferences dialog to call
a callback on my variables with a pointer to the decoder, so
changing the variables will not have effect till VLC is started
again.

Also includes the misc kate fixes from a previous patch, which
was not applied yet, but changes the same code as this patch
(and fixed a possible crash).

Note that I don't have a big endian host to check, so the RGBA
component flipping code is untested.
Signed-off-by: Rémi Denis-Courmont <rdenis@simphalempin.com>

configure.ac

@@ -3841,6 +3841,23 @@ AS_IF([test "${enable_kate}" != "no"], [
 ])
 
 
+dnl
+dnl  tiger decoder plugin
+dnl
+AC_ARG_ENABLE(tiger,
+[  --enable-tiger          Tiger rendering library for Kate streams (default enabled)])
+AS_IF([test "${enable_tiger}" != "no"], [
+  PKG_CHECK_MODULES(TIGER,[tiger >= 0.3.1], [
+      AC_DEFINE(HAVE_TIGER, 1, [Define if libtiger is available.])
+      VLC_ADD_CFLAGS([kate],[$TIGER_CFLAGS])
+      VLC_ADD_LIBS([kate],[$TIGER_LIBS]) ],[
+        AS_IF([test "x${enable_tiger}" != "x"], [
+          AC_MSG_ERROR([libtiger does not appear to be installed on your system.])
+        ])
+  ])
+])
+
+
 dnl
 dnl  Video plugins
 dnl