Mostly-functioning Win32 font backend; no glyph paths yet.

Turn on building of the Win32 font backend.
src/cairo-win32-private.h src/Makefile.am: Private header for the Win32 backend.
src/cairo-win32-private.h src/cairo_win32_surface.c: Internally export _cairo_win32_print_gdi_error() for use in the font code.
src/cairo-win32-private.h src/cairo_win32_surface.c: Add _cairo_win32_surface_create_dib to create a DIB surface.
src/cairo-win32-private.h src/cairo_win32_surface.c: Add _cairo_surface_is_win32()
Check for vasnprintf.
Add a simple fixed-buffer size snprintf fallback in the absence of vasnprintf.

1 files changed, 28 insertions, 1 deletions

diff --git a/test/cairo_test.c b/test/cairo_test.c
index 978404d18..c1800ed43 100644
--- a/test/cairo_test.c
+++ b/test/cairo_test.c
@@ -44,9 +44,10 @@
 static void
 xasprintf (char **strp, const char *fmt, ...)
 {
+#ifdef HAVE_VASPRINTF    
     va_list va;
     int ret;
-
+    
     va_start (va, fmt);
     ret = vasprintf (strp, fmt, va);
     va_end (va);
@@ -55,6 +56,32 @@ xasprintf (char **strp, const char *fmt, ...)
 	fprintf (stderr, "Out of memory\n");
 	exit (1);
     }
+#else /* !HAVE_VASNPRINTF */
+#define BUF_SIZE 1024
+    va_list va;
+    char buffer[BUF_SIZE];
+    int ret;
+    
+    va_start (va, fmt);
+    ret = vsnprintf (buffer, sizeof(buffer), fmt, va);
+    va_end (va);
+
+    if (ret < 0) {
+	fprintf (stderr, "Failure in vsnprintf\n");
+	exit (1);
+    }
+    
+    if (strlen (buffer) == sizeof(buffer) - 1) {
+	fprintf (stderr, "Overflowed fixed buffer\n");
+	exit (1);
+    }
+    
+    *strp = strdup (buffer);
+    if (!*strp) {
+	fprintf (stderr, "Out of memory\n");
+	exit (1);
+    }
+#endif /* !HAVE_VASNPRINTF */
 }
 
 cairo_test_status_t