contrib: ass: Fix Dwrite usage on WinRT/UWP

contrib/src/ass/dwrite.patch

@@ -0,0 +1,48 @@
+--- libass/libass/ass_directwrite.c.orig	2016-12-14 12:09:24.569899227 +0100
++++ libass/libass/ass_directwrite.c	2016-12-14 12:21:28.429203219 +0100
+@@ -23,6 +23,7 @@
+ #include <initguid.h>
+ #include <ole2.h>
+ #include <shobjidl.h>
++#include <winapifamily.h>
+
+ #include "dwrite_c.h"
+
+@@ -742,8 +743,9 @@
+     ASS_FontProvider *provider = NULL;
+     DWriteCreateFactoryFn DWriteCreateFactoryPtr = NULL;
+     ProviderPrivate *priv = NULL;
+-
+-    HMODULE directwrite_lib = LoadLibraryW(L"Dwrite.dll");
++    HMODULE directwrite_lib = NULL;
++#if WINAPI_FAMILY_PARTITION (WINAPI_PARTITION_DESKTOP)
++    directwrite_lib = LoadLibraryW(L"Dwrite.dll");
+     if (!directwrite_lib)
+         goto cleanup;
+
+@@ -751,6 +753,9 @@
+                                                                    "DWriteCreateFactory");
+     if (!DWriteCreateFactoryPtr)
+         goto cleanup;
++#else
++    DWriteCreateFactoryPtr = DWriteCreateFactory;
++#endif
+
+     hr = DWriteCreateFactoryPtr(DWRITE_FACTORY_TYPE_SHARED,
+                                 &IID_IDWriteFactory,
+--- libass/libass/dwrite_c.h.orig	2016-12-14 12:36:59.215968100 +0100
++++ libass/libass/dwrite_c.h	2016-12-14 12:38:42.359500667 +0100
+@@ -142,6 +142,13 @@
+ typedef struct DWRITE_TRIMMING DWRITE_TRIMMING;
+ typedef struct DWRITE_UNDERLINE DWRITE_UNDERLINE;
+
++DWRITEAPI HRESULT WINAPI DWriteCreateFactory(
++  DWRITE_FACTORY_TYPE factoryType,
++  REFIID iid,
++  IUnknown **factory
++);
++
++
+ #ifndef __MINGW_DEF_ARG_VAL
+ #ifdef __cplusplus
+ #define __MINGW_DEF_ARG_VAL(x) = x

contrib/src/ass/rules.mak

@@ -25,6 +25,7 @@ else
 ifdef HAVE_WINSTORE
 WITH_FONTCONFIG = 0
 WITH_HARFBUZZ = 1
+WITH_DWRITE = 1
 else
 WITH_FONTCONFIG = 1
 WITH_HARFBUZZ = 1
@@ -43,20 +44,25 @@ libass: libass-$(ASS_VERSION).tar.gz .sum-ass
 	$(APPLY) $(SRC)/ass/ass-macosx.patch
 ifdef HAVE_WIN32
 	$(APPLY) $(SRC)/ass/use-topendir.patch
+ifdef HAVE_WINSTORE
+	$(APPLY) $(SRC)/ass/dwrite.patch
+endif
 endif
 	$(UPDATE_AUTOCONFIG)
 	$(MOVE)
 
 DEPS_ass = freetype2 $(DEPS_freetype2) fribidi
 
-ASS_CONF=--disable-enca
-
 ifneq ($(WITH_FONTCONFIG), 0)
 DEPS_ass += fontconfig $(DEPS_fontconfig)
 else
 ASS_CONF += --disable-fontconfig --disable-require-system-font-provider
 endif
 
+ifneq ($(WITH_DWRITE), 0)
+ASS_CONF += --enable-directwrite
+endif
+
 ifneq ($(WITH_HARFBUZZ), 0)
 DEPS_ass += harfbuzz $(DEPS_harfbuzz)
 else

modules/codec/Makefile.am

@@ -173,6 +173,9 @@ liblibass_plugin_la_CPPFLAGS = $(AM_CPPFLAGS) $(CPPFLAGS_libass)
 liblibass_plugin_la_CFLAGS = $(AM_CFLAGS) $(LIBASS_CFLAGS)
 liblibass_plugin_la_LDFLAGS = $(AM_LDFLAGS) -rpath '$(codecdir)'
 liblibass_plugin_la_LIBADD = $(LIBASS_LIBS) $(LIBS_libass) $(LIBS_freetype) $(FREETYPE_LIBS)
+if HAVE_WINSTORE
+liblibass_plugin_la_LIBADD += -ldwrite
+endif
 EXTRA_LTLIBRARIES += liblibass_plugin.la
 codec_LTLIBRARIES += $(LTLIBlibass)