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List:       openjdk-2d-dev
Subject:    [OpenJDK 2D-Dev] How to resolve image tearing
From:       ims3g () 126 ! com (ximalaya)
Date:       2011-04-12 14:49:15
Message-ID: f511b6a.1beee.12f4a30121f.Coremail.ims3g () 126 ! com
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Hi there,
We are implementing a swing application which is required to display images of moving \
object at about 30 fps(frames per second).  But now we are facing image tearing \
problem(parts of multiple frames displayed on the screen at the same time).  Does \
anyone know the solution to resolve it in Java?

We found there is already an opened bug 6378181 for this issue,  however it is still \
in state "Accepted". Can 2D developers/experts share the fix plan/dev roadmap for \
this bug? http://bugs.sun.com/view_bug.do?bug_id=6378181

> From the bug report,  it is said vsync is required to fix image tearing. Before \
> 6378181 is closed, at current stage, is there a way to support vsync?

We've tried JOGL(java over openGL, support vsync, GLCanvas is used), it can fix image \
tearing issue. Howerver, there is issues to mix lightweight(text as overlay on the \
image) and heavyweight(GLCanvas) components. Latest openJDK ! 6/7 was used in our \
test. We have HW and LW componets as following, 1) A  HW component GLCanvas(JOGL \
class, subclass of Canvas), which contains an image. 2) LW component JComponent, \
which is non-opaque and contains some texts. We expect the texts can be shown over \
the image, while we could only see either the image or texts: With openJDK 1.6.0_18, \
we could see the image, while the text is invisible. With latest openJDK6/7, we only \
see the texts, the image is invisible(only a black area shown).

BTW, we don't want  full-screen mode application.

See more information regarding tearing here,
http://en.wikipedia.org/wiki/Screen_tearing

Thanks and Best Regards,
Lin


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