Detect Windows GDI at configuration time.

git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/libpipi/trunk@2839 92316355-f0b4-4df1-b90c-862c8a59935f

configure.ac

@@ -25,6 +25,16 @@ AC_LIBTOOL_CXX
 AC_C_CONST
 AC_C_INLINE
 
+dnl AC_PROG_EGREP only exists in autoconf 2.54+, so we use AC_EGREP_CPP right
+dnl now otherwise it might be set in an obscure if statement. Same thing for
+dnl PKG_PROG_PKG_CONFIG which needs to be called first.
+AC_EGREP_CPP(yes, foo)
+PKG_PROG_PKG_CONFIG()
+m4_pattern_allow([^PKG_CONFIG_LIBDIR$])
+if test "${build}" != "${host}" -a "${PKG_CONFIG_LIBDIR}" = ""; then
+  export PKG_CONFIG_LIBDIR=/dev/null
+fi
+
 AC_CHECK_HEADERS(stdio.h stdarg.h inttypes.h endian.h stdint.h getopt.h)
 
 ac_cv_have_getopt_long="no"
@@ -92,6 +102,17 @@ if test "${ac_cv_my_have_imlib2}" != "no"; then
 fi
 AM_CONDITIONAL(USE_IMLIB2, test "${ac_cv_my_have_imlib2}" = "yes")
 
+# Use Windows GDI?
+ac_cv_my_have_gdi="no"
+GDI="no"
+AC_CHECK_HEADERS(windows.h,
+ [ac_cv_my_have_gdi="yes"],
+ [ac_cv_my_have_gdi="no"])
+if test "${ac_cv_my_have_gdi}" != "no"; then
+  AC_DEFINE(USE_GDI, 1, Define to 1 to use GDI)
+fi
+AM_CONDITIONAL(USE_GDI, test "${ac_cv_my_have_gdi}" = "yes")
+
 if test "${ac_cv_my_have_il}" = "no" -a "${ac_cv_my_have_ole}" = "no" -a "${ac_cv_my_have_sdl}" = "no" -a "${ac_cv_my_have_imlib2}" = "no" -a "${ac_cv_my_have_opencv}" = "no"; then
   AC_MSG_ERROR([[cannot find DevIL, OLE, SDL_Image, Imlib2 or OpenCV, please install one of them]])
 fi

pipi/Makefile.am

@@ -102,3 +102,7 @@ codec_libs += @OPENCV_LIBS@
 codec_sources += codec/opencv.c
 endif
 
+if USE_GDI
+codec_sources += codec/gdi.c
+endif
+