JDK-6725365 : Per-pixel transparency must only be available for undecorated frames/windows
  • Type: Bug
  • Component: client-libs
  • Sub-Component: java.awt
  • Affected Version: 6u10
  • Priority: P2
  • Status: Resolved
  • Resolution: Fixed
  • OS: generic,windows_vista
  • CPU: generic
  • Submitted: 2008-07-14
  • Updated: 2017-05-16
  • Resolved: 2008-09-02
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JDK 6 JDK 7
6u10 b31Fixed 7Resolved
Related Reports
Duplicate :  
JDK-6725417 - Perpixel Transparent Windows broken on Vista with Aero - Still shows window decorations
Relates :  
JDK-6862560 - Frame is becoming undecorated when setting its background to alpha value less then 255
Relates :  
JDK-6993784 - Clarification to shaped/translucent windows specification is required
Relates :  
JDK-6633275 - Need to support shaped/translucent windows
Description
It was initially considered to allow using the per-pixel transparency mode for undecorated windows only, because it was unclear what to do with the natively-drawn window decorations. Especially on MS Windows platform where the decorations stop reacting on mouse clicks but still are drawn in some cases once the window enters the non-opaque mode.

For some reason the code checking for this got lost, and curretnly the com.sun.awt.AWTUtilities.setWindowOpaque() method does not throw an exception in case the windod is decorated, but it should do so.

If the user simply forgets to call the setUndecorated(true) method, he easily gets non-functional decorations on MS Windows Vista. The visual artifact is considered quite severe.

The bug is reported here: http://forums.java.net/jive/thread.jspa?threadID=43881&tstart=0
Comments
EVALUATION The code checking for isDecorated() got lost.
14-07-2008
SUGGESTED FIX --- old/src/share/classes/com/sun/awt/AWTUtilities.java 2008-07-25 14:17:12.000000000 +0400 +++ new/src/share/classes/com/sun/awt/AWTUtilities.java 2008-07-25 14:17:12.000000000 +0400 @@ -340,6 +340,13 @@ * <p>Also note that the window must not be in the full-screen mode * when making it non-opaque. Otherwise the IllegalArgumentException * is thrown. + * <p>If the window is a {@code Frame} or a {@code Dialog}, the window must + * be undecorated prior to enabling the per-pixel translucency effect (see + * {@link Frame#setUndecorated()} and/or {@link Dialog#setUndecorated()}). + * If the window becomes decorated through a subsequent call to the + * corresponding {@code setUndecorated()} method, the per-pixel + * translucency effect will be disabled and the opaque property reset to + * {@code true}. * <p>Depending on the platform, the method may return without * effecting the opaque property of the window if the window has a non-null * warning string ({@link Window#getWarningString()}). In this case @@ -355,6 +362,7 @@ * method returns false * @throws IllegalArgumentException if the window is in full screen mode, * and the isOpaque is false + * @throws IllegalArgumentException if the window is decorated. * @throws UnsupportedOperationException if the PERPIXEL_TRANSLUCENT * translucency kind is not supported */ @@ -363,17 +371,24 @@ throw new NullPointerException( "The window argument should not be null."); } - if (!isTranslucencyCapable( + if (!isOpaque && !isTranslucencyCapable( window.getGraphicsConfiguration())) { throw new IllegalArgumentException( "The window must use a translucency-compatible graphics configuration"); } - if (window.getGraphicsConfiguration().getDevice().getFullScreenWindow() - == window && !isOpaque) { + if (!isOpaque && window.getGraphicsConfiguration().getDevice().getFullScreenWindow() + == window) { throw new IllegalArgumentException( "The effects for full-screen windows are not supported."); } - if (!isTranslucencySupported(Translucency.PERPIXEL_TRANSLUCENT)) { + if (!isOpaque && + ((window instanceof Frame && !((Frame)window).isUndecorated()) || + (window instanceof Dialog && !((Dialog)window).isUndecorated()))) + { + throw new IllegalArgumentException( + "The effects for decorated windows are not supported."); + } + if (!isOpaque && !isTranslucencySupported(Translucency.PERPIXEL_TRANSLUCENT)) { throw new UnsupportedOperationException( "The PERPIXEL_TRANSLUCENT translucency kind is not supported"); } --- old/src/share/classes/java/awt/Dialog.java 2008-07-25 14:17:12.000000000 +0400 +++ new/src/share/classes/java/awt/Dialog.java 2008-07-25 14:17:12.000000000 +0400 @@ -15,6 +15,7 @@ import java.util.Vector; import java.util.Iterator; import sun.awt.AppContext; +import sun.awt.AWTAccessor; import sun.awt.SunToolkit; import sun.awt.PeerEvent; import java.lang.ref.WeakReference; @@ -1321,6 +1322,16 @@ if (isDisplayable()) { throw new IllegalComponentStateException("The dialog is displayable."); } + if (!undecorated) { + //XXX: this needs to be documented in a further release, + //or better: we may throw an exception here. + if (!AWTAccessor.getWindowAccessor().isOpaque(this)) { + AWTAccessor.getWindowAccessor().setOpaque(this, true); + } + if (AWTAccessor.getWindowAccessor().getShape(this) != null) { + AWTAccessor.getWindowAccessor().setShape(this, null); + } + } this.undecorated = undecorated; } } --- old/src/share/classes/java/awt/Frame.java 2008-07-25 14:17:13.000000000 +0400 +++ new/src/share/classes/java/awt/Frame.java 2008-07-25 14:17:13.000000000 +0400 @@ -18,6 +18,7 @@ import java.io.IOException; import sun.awt.AppContext; import sun.awt.SunToolkit; +import sun.awt.AWTAccessor; import java.lang.ref.WeakReference; import javax.accessibility.*; @@ -809,6 +810,16 @@ if (isDisplayable()) { throw new IllegalComponentStateException("The frame is displayable."); } + if (!undecorated) { + //XXX: this needs to be documented in a further release, + //or better: we may throw an exception here. + if (!AWTAccessor.getWindowAccessor().isOpaque(this)) { + AWTAccessor.getWindowAccessor().setOpaque(this, true); + } + if (AWTAccessor.getWindowAccessor().getShape(this) != null) { + AWTAccessor.getWindowAccessor().setShape(this, null); + } + } this.undecorated = undecorated; } }
14-07-2008