open-scene-graph: displayBitsPerPixel patch for Lion

Closes Homebrew/homebrew#11788.

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

Formula/open-scene-graph.rb

@@ -30,10 +30,13 @@ class OpenSceneGraph < Formula
       EOS
   end
 
-  # The mini-Boost finder in FindCOLLADA doesn't find our boost, so fix it.
+  # First patch: The mini-Boost finder in FindCOLLADA doesn't find our boost, so fix it.
-  def patches
+  # Second patch:
-    return DATA
+  # Lion replacement for CGDisplayBitsPerPixel();
-  end
+  # 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
 
   def install
     args = %W{
@@ -88,3 +91,54 @@ index 428cb29..6206580 100644
          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,