open-scene-graph: apply patch only to stable version

Closes #12689.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Library/Formula/open-scene-graph.rb

@@ -35,8 +35,11 @@ class OpenSceneGraph < Formula
   # Lion replacement for CGDisplayBitsPerPixel();
   # taken from: http://www.openscenegraph.org/projects/osg/changeset/12790/OpenSceneGraph/trunk/src/osgViewer/DarwinUtils.mm
   # Issue at: https://github.com/mxcl/homebrew/issues/11391
-  # should be obsolete with some newer versions (current version is: 3.0.1)
-  def patches; DATA; end
+  # the second patch should be obsolete with some newer versions (current version is: 3.0.1, it's fixed upstream in 3.1.1)
+  def patches
+    p = [DATA]
+    p << "https://raw.github.com/gist/2890654/a07dec42b8451edf9edbf6468e5ae464c73b3b95/osg.diff" if build.stable?
+  end
 
   def install
     args = %W{
@@ -91,54 +94,3 @@ def install
          PATHS
          ${COLLADA_DOM_ROOT}/external-libs/boost/lib/${COLLADA_BUILDNAME}
          ${COLLADA_DOM_ROOT}/external-libs/boost/lib/mingw
-
-
-Index: OpenSceneGraph/trunk/src/osgViewer/DarwinUtils.mm
-===================================================================
---- a/src/osgViewer/DarwinUtils.mm (revision 12292)
-+++ b/src/osgViewer/DarwinUtils.mm (revision 12790)
-@@ -48,4 +48,23 @@
- namespace osgDarwin {
-
-+//
-+// Lion replacement for CGDisplayBitsPerPixel(CGDirectDisplayID displayId)
-+//
-+size_t displayBitsPerPixel( CGDirectDisplayID displayId )
-+{
-+
-+    CGDisplayModeRef mode = CGDisplayCopyDisplayMode(displayId);
-+    size_t depth = 0;
-+
-+    CFStringRef pixEnc = CGDisplayModeCopyPixelEncoding(mode);
-+    if(CFStringCompare(pixEnc, CFSTR(IO32BitDirectPixels), kCFCompareCaseInsensitive) == kCFCompareEqualTo)
-+        depth = 32;
-+    else if(CFStringCompare(pixEnc, CFSTR(IO16BitDirectPixels), kCFCompareCaseInsensitive) == kCFCompareEqualTo)
-+        depth = 16;
-+    else if(CFStringCompare(pixEnc, CFSTR(IO8BitIndexedPixels), kCFCompareCaseInsensitive) == kCFCompareEqualTo)
-+        depth = 8;
-+
-+    return depth;
-+}
-
- static inline CGRect toCGRect(NSRect nsRect)
-@@ -314,5 +333,5 @@
-     resolution.width = CGDisplayPixelsWide(id);
-     resolution.height = CGDisplayPixelsHigh(id);
--    resolution.colorDepth = CGDisplayBitsPerPixel(id);
-+    resolution.colorDepth = displayBitsPerPixel(id);
-     resolution.refreshRate = getDictDouble (CGDisplayCurrentMode(id), kCGDisplayRefreshRate);        // Not tested
-     if (resolution.refreshRate<0) resolution.refreshRate = 0;
-@@ -403,5 +422,5 @@
-         CGDisplayBestModeForParametersAndRefreshRate(
-                         displayid, 
--                        CGDisplayBitsPerPixel(displayid), 
-+                        displayBitsPerPixel(displayid), 
-                         width, height,  
-                         refresh,  
-@@ -433,5 +452,5 @@
-         CGDisplayBestModeForParametersAndRefreshRate(
-                         displayid, 
--                        CGDisplayBitsPerPixel(displayid), 
-+                        displayBitsPerPixel(displayid), 
-                         width, height,  
-                         refreshRate,