Akihiro Sagawa : winex11.drv: Fix empty glyph handling.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 310a3b1d11bd175ee1182b0e37812fd140a7b6b4
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=310a3b1d11bd175ee1182b0e37812fd140a7b6b4

Author: Akihiro Sagawa <sagawa.aki at gmail.com>
Date:   Fri Sep 20 00:57:48 2013 +0900

winex11.drv: Fix empty glyph handling.

---

 dlls/winex11.drv/xrender.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/dlls/winex11.drv/xrender.c b/dlls/winex11.drv/xrender.c
index 671f67a..ca2d3da 100644
--- a/dlls/winex11.drv/xrender.c
+++ b/dlls/winex11.drv/xrender.c
@@ -1129,7 +1129,10 @@ static void UploadGlyph(struct xrender_physdev *physDev, UINT glyph, enum glyph_
 
 
     buf = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, buflen);
-    GetGlyphOutlineW(physDev->dev.hdc, glyph, ggo_format, &gm, buflen, buf, &identity);
+    if (buflen)
+        GetGlyphOutlineW(physDev->dev.hdc, glyph, ggo_format, &gm, buflen, buf, &identity);
+    else
+        gm.gmBlackBoxX = gm.gmBlackBoxY = 0;  /* empty glyph */
     formatEntry->realized[glyph] = TRUE;
 
     TRACE("buflen = %d. Got metrics: %dx%d adv=%d,%d origin=%d,%d\n",