Replace deprecated CGDisplay functions on OS X

- Replaced deprecated function calls with custom
  function that does the same as the old function.
  It may not always work exactly the same but in my testing
  on my machine it gave the same results.
- Keeps the old functions if compiling for earlier than 10.6
  and uses the new code otherwise. If support for 10.5 and
  earlier isn't needed then the old code should just
  be removed.

Core/Contents/Source/PolyCocoaCore.mm

@@ -30,6 +30,44 @@
 
 using namespace Polycode;
 
+static bool DisplayModeIs32Bit(CGDisplayModeRef displayMode)
+{
+	bool is32Bit = false;
+	CFStringRef pixelEncoding = CGDisplayModeCopyPixelEncoding(displayMode);
+    if(CFStringCompare(pixelEncoding, CFSTR(IO32BitDirectPixels), 0) == kCFCompareEqualTo)
+        is32Bit = true;
+    CFRelease(pixelEncoding);
+
+	return is32Bit;
+}
+
+static CGDisplayModeRef GetBestDisplayModeForParameters(size_t bitsPerPixel, size_t xRes, size_t yRes)
+{
+	CGDisplayModeRef bestDisplayMode = CGDisplayCopyDisplayMode(CGMainDisplayID());
+	size_t bestWidth = CGDisplayModeGetWidth(bestDisplayMode);
+	size_t bestHeight = CGDisplayModeGetHeight(bestDisplayMode);
+	NSArray* displayModes = (NSArray*)CGDisplayCopyAllDisplayModes(CGMainDisplayID(), NULL);
+	for(NSUInteger i = 0; i < [displayModes count]; ++i)
+	{
+		CGDisplayModeRef candidate = (CGDisplayModeRef)[displayModes objectAtIndex:i];
+		size_t candidateWidth  = CGDisplayModeGetWidth(candidate);
+		size_t candidateHeight = CGDisplayModeGetHeight(candidate);
+		if(!DisplayModeIs32Bit(candidate))
+			continue;
+		if(candidateWidth >= xRes && candidateWidth < bestWidth
+		   && candidateHeight >= yRes && candidateHeight < bestHeight)
+		{
+			CGDisplayModeRelease(bestDisplayMode);
+			bestDisplayMode = candidate;
+			bestWidth = candidateWidth;
+			bestHeight = candidateHeight;
+			CGDisplayModeRetain(bestDisplayMode);
+		}
+	}
+	[displayModes release];
+	return bestDisplayMode;
+}
+
 long getThreadID() {
 	return (long)pthread_self();
 }
@@ -163,8 +201,18 @@ void CocoaCore::setVideoMode(int xRes, int yRes, bool fullScreen, bool vSync, in
 //	} else {
 //		CGDisplaySwitchToMode (kCGDirectMainDisplay, CGDisplayBestModeForParameters (kCGDirectMainDisplay, 32, xRes, yRes, NULL) );						
 //	}
-	if(fullScreen) {	
-		CGDisplaySwitchToMode (kCGDirectMainDisplay, CGDisplayBestModeForParameters (kCGDirectMainDisplay, 32, xRes, yRes, NULL) );			
+	if(fullScreen) {
+#		if __MAC_OS_X_VERSION_MIN_REQUIRED < 1060
+		{
+			CGDisplaySwitchToMode (kCGDirectMainDisplay, CGDisplayBestModeForParameters (kCGDirectMainDisplay, 32, xRes, yRes, NULL) );
+		}
+#		else
+		{
+			CGDisplayModeRef bestDisplayMode = GetBestDisplayModeForParameters(32, xRes, yRes);
+			CGDisplaySetDisplayMode(CGMainDisplayID(), bestDisplayMode, NULL);
+			CGDisplayModeRelease(bestDisplayMode);
+		}
+#		endif
 		
 		if(monitorIndex > -1) {
 			if(monitorIndex > [[NSScreen screens] count]-1) {