Bug 718: Windows BITMAP Offscreen Fails w/ GLCaps other than simple RGB888 - Filter invalid PFD configs

- Filter invalid PFD configs
  - WindowsBitmapWGLDrawable: Clip chosenCaps to RGBA888[0|8]
  - WindowsBitmapWGLDrawable: Only use BITMAPINFOHEADER.BiBitCount=24
  - WindowsWGLGraphicsConfiguration: Only allow GDI BITMAP PFD's w/ RGB888 w/ alpha <= red, others may fail

- WindowsWGLGraphicsConfigurationFactory.getAvailableGLCapabilities()
  - Fetch ARB caps w/o BITMAP
  - Concat GDI [BITMAP] caps

1 files changed, 14 insertions, 1 deletions

diff --git a/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLGraphicsConfiguration.java b/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLGraphicsConfiguration.java
index 7709e5884..fdff20daa 100644
--- a/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLGraphicsConfiguration.java
+++ b/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLGraphicsConfiguration.java
@@ -684,15 +684,28 @@ public class WindowsWGLGraphicsConfiguration extends MutableGraphicsConfiguratio
         if(null == pfd) {
             return null;
         }
-        if ((pfd.getDwFlags() & GDI.PFD_SUPPORT_OPENGL) == 0) {
+        if ( (pfd.getDwFlags() & GDI.PFD_SUPPORT_OPENGL) == 0) {
             return null;
         }
         final int allDrawableTypeBits = PFD2DrawableTypeBits(pfd);
         final int drawableTypeBits = winattrmask & allDrawableTypeBits;
 
         if( 0 == drawableTypeBits ) {
+            if(DEBUG) {
+                System.err.println("Drop [drawableType mismatch]: " + WGLGLCapabilities.PFD2String(pfd, pfdID));
+            }
             return null;
         }
+        if( GLGraphicsConfigurationUtil.BITMAP_BIT == drawableTypeBits ) {
+            // BITMAP exclusive PFD SafeGuard: Only accept BITMAP compatible color formats!
+            final int pfdColorBits = pfd.getCColorBits(); 
+            if ( pfdColorBits != 24 || pfd.getCRedBits() < pfd.getCAlphaBits() ) { // Allowed: RGB888 && alpha <= red
+                if(DEBUG) {
+                    System.err.println("Drop [color bits excl BITMAP]: " + WGLGLCapabilities.PFD2String(pfd, pfdID));
+                }
+                return null;
+            }
+        }
 
         final WGLGLCapabilities res = new WGLGLCapabilities(pfd, pfdID, glp);
         res.setValuesByGDI();