Hi
The ioctl will wait for the VSYNC (vertical sync ) interrupt. This
interrupt is generated when a image is written completely to the
framebuffer. If you try to to write another image before one has not
yet been written completely the flicker will occur. So use
WAITFOR_VSYNC to wait till the interrupt happens and write the next
image.
--
Best Regards
Pramod
2009/6/26 Terry Z <pizbj9...@gmail.com>:
>
> Thank you Manjunatha:
> I got it.
> I am now using pxa310 platform, and didn't find the WAITFOR_VSYNC
> ioctl. can you please give me some advices.
> what should the WAITFOR_VSYNC do in framebuffer?
>
> best wishes
> Terry
>
> On 6月26日, 下午2时20分, halli manjunatha <hallima...@gmail.com> wrote:
>> Hi,
>> while writing images to framebuffer we need to ensure that the previous
>> frame is written completely
>> this is not happening in case when you open the widgets like softkeypad. so
>> use of WAITFOR_VSYNC ioctl
>> will ensure the completion of previous frame.
>>
>> In case of normal operation the frame rate is low so you dont see the
>> effect, but in case of high frame rate you will see the flickers
>>
>> 2009/6/26 Terry Z <pizbj9...@gmail.com>
>>
>>
>>
>>
>>
>>
>>
>> > Thank you Manjunatha
>>
>> > As you said, you may think that it's the framebuffer driver caused
>> > the flicker. but there is no flicker if I do not use the soft
>> > keyboard.
>> > can you explain how that hanppens?
>>
>> > best wishes
>> > Terry
>>
>> > On 6月26日, 下午12时14分, halli manjunatha <hallima...@gmail.com> wrote:
>> > > Hi Terry,
>> > > You need to use the WAITFOR_VSYNC ioctl in the "
>> > > frameworks/base/libs/ui/EGLDisplaySurface.cpp " file following is the
>> > code
>>
>> > > if (ioctl (egl_native_window_t::fd, FBIOPAN_DISPLAY, &mInfo)) {
>> > > LOGE("ioctl FBIOPAN_DISPLAY failed\n");
>> > > return 0;
>> > > }
>>
>> > > if (ioctl (egl_native_window_t::fd, FBIO_WAITFORVSYNC, 0)) {
>> > > LOGE("ioctl FBIO_WAITFORVSYNC failed\n");
>> > > return 0;
>> > > }
>>
>> > > before doing this comment out the call to FBIOPUT_VSCREENINFO
>>
>> > > On Fri, Jun 26, 2009 at 7:23 AM, Terry Z<pizbj9...@gmail.com> wrote:
>>
>> > > > When I first start th soft keyboard, I found a "ARMAssembler" from
>> > > > the logcat.
>>
>> > > > I/ARMAssembler( 47): generated
>> > > > scanline__00000077:03515104_00001A01_00000000 [ 46 ipp] (68 ins) at
>> > > > [0x2268f0:0x226a00] in 335693 ns
>> > > > I/InetAddress( 83): Unknown hostwww.google.com, throwing
>> > > > UnknownHostException
>> > > > E/ActivityThread( 83): Failed to find provider info for
>> > > > android.server.checkin
>> > > > E/GoogleHttpClient( 83): Error recording stats
>> > > > E/GoogleHttpClient( 83): java.lang.IllegalArgumentException: Unknown
>> > > > URL content://android.server.checkin/stats
>> > > > E/GoogleHttpClient( 83): at
>> > > > android.content.ContentResolver.insert(ContentResolver.java:473)
>> > > > E/GoogleHttpClient( 83): at
>> > > > com.google.android.net.GoogleHttpClient.executeWithoutRewriting
>> > > > (GoogleHttpClient.java:192)
>> > > > E/GoogleHttpClient( 83): at
>> > > > com.google.android.net.GoogleHttpClient.execute(GoogleHttpClient.java:
>> > > > 212)
>> > > > E/GoogleHttpClient( 83): at
>> > > > com.google.android.net.GoogleHttpClient.execute(GoogleHttpClient.java:
>> > > > 282)
>> > > > E/GoogleHttpClient( 83): at
>> > > > com.android.googlesearch.SuggestionProvider.query
>> > > > (SuggestionProvider.java:134)
>> > > > E/GoogleHttpClient( 83): at android.content.ContentProvider
>> > > > $Transport.query(ContentProvider.java:129)
>> > > > E/GoogleHttpClient( 83): at
>> > > > android.content.ContentResolver.query(ContentResolver.java:149)
>> > > > E/GoogleHttpClient( 83): at com.android.launcher.Search
>> > > > $SuggestionsAdapter.getSuggestions(Search.java:661)
>> > > > E/GoogleHttpClient( 83): at com.android.launcher.Search
>> > > > $SuggestionsAdapter.runQueryOnBackgroundThread(Search.java:602)
>> > > > E/GoogleHttpClient( 83): at
>> > > > android.widget.CursorFilter.performFiltering(CursorFilter.java:49)
>> > > > E/GoogleHttpClient( 83): at android.widget.Filter
>> > > > $RequestHandler.handleMessage(Filter.java:215)
>> > > > E/GoogleHttpClient( 83): at android.os.Handler.dispatchMessage
>> > > > (Handler.java:99)
>> > > > E/GoogleHttpClient( 83): at android.os.Looper.loop(Looper.java:
>> > > > 123)
>> > > > E/GoogleHttpClient( 83): at android.os.HandlerThread.run
>> > > > (HandlerThread.java:60)
>> > > > W/GoogleSearch.SuggestionProvider( 83): Error
>> > > > W/GoogleSearch.SuggestionProvider( 83):
>> > > > java.net.UnknownHostException: Host is unresolved:www.google.com:80
>> > > > W/GoogleSearch.SuggestionProvider( 83): at
>> > > > java.net.Socket.connect(Socket.java:1002)
>> > > > W/GoogleSearch.SuggestionProvider( 83): at
>> > > > org.apache.http.conn.scheme.PlainSocketFactory.connectSocket
>> > > > (PlainSocketFactory.java:117)
>> > > > W/GoogleSearch.SuggestionProvider( 83): at
>>
>> > org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection
>> > > > (DefaultClientConnectionOperator.java:129)
>> > > > W/GoogleSearch.SuggestionProvider( 83): at
>> > > > org.apache.http.impl.conn.AbstractPoolEntry.open
>> > > > (AbstractPoolEntry.java:164)
>> > > > W/GoogleSearch.SuggestionProvider( 83): at
>> > > > org.apache.http.impl.conn.AbstractPooledConnAdapter.open
>> > > > (AbstractPooledConnAdapter.java:119)
>> > > > W/GoogleSearch.SuggestionProvider( 83): at
>> > > > org.apache.http.impl.client.DefaultRequestDirector.execute
>> > > > (DefaultRequestDirector.java:348)
>> > > > W/GoogleSearch.SuggestionProvider( 83): at
>> > > > org.apache.http.impl.client.AbstractHttpClient.execute
>> > > > (AbstractHttpClient.java:555)
>> > > > W/GoogleSearch.SuggestionProvider( 83): at
>> > > > org.apache.http.impl.client.AbstractHttpClient.execute
>> > > > (AbstractHttpClient.java:487)
>> > > > W/GoogleSearch.SuggestionProvider( 83): at
>> > > > android.net.http.AndroidHttpClient.execute(AndroidHttpClient.java:288)
>> > > > W/GoogleSearch.SuggestionProvider( 83): at
>> > > > com.google.android.net.GoogleHttpClient.executeWithoutRewriting
>> > > > (GoogleHttpClient.java:173)
>> > > > W/GoogleSearch.SuggestionProvider( 83): at
>> > > > com.google.android.net.GoogleHttpClient.execute(GoogleHttpClient.java:
>> > > > 212)
>> > > > W/GoogleSearch.SuggestionProvider( 83): at
>> > > > com.google.android.net.GoogleHttpClient.execute(GoogleHttpClient.java:
>> > > > 282)
>> > > > W/GoogleSearch.SuggestionProvider( 83): at
>> > > > com.android.googlesearch.SuggestionProvider.query
>> > > > (SuggestionProvider.java:134)
>> > > > W/GoogleSearch.SuggestionProvider( 83): at
>> > > > android.content.ContentProvider$Transport.query(ContentProvider.java:
>> > > > 129)
>> > > > W/GoogleSearch.SuggestionProvider( 83): at
>> > > > android.content.ContentResolver.query(ContentResolver.java:149)
>> > > > W/GoogleSearch.SuggestionProvider( 83): at
>> > > > com.android.launcher.Search$SuggestionsAdapter.getSuggestions
>> > > > (Search.java:661)
>> > > > W/GoogleSearch.SuggestionProvider( 83): at
>> > > > com.android.launcher.Search
>> > > > $SuggestionsAdapter.runQueryOnBackgroundThread(Search.java:602)
>> > > > W/GoogleSearch.SuggestionProvider( 83): at
>> > > > android.widget.CursorFilter.performFiltering(CursorFilter.java:49)
>> > > > W/GoogleSearch.SuggestionProvider( 83): at
>> > > > android.widget.Filter$RequestHandler.handleMessage(Filter.java:215)
>> > > > W/GoogleSearch.SuggestionProvider( 83): at
>> > > > android.os.Handler.dispatchMessage(Handler.java:99)
>> > > > W/GoogleSearch.SuggestionProvider( 83): at
>> > > > android.os.Looper.loop(Looper.java:123)
>> > > > W/GoogleSearch.SuggestionProvider( 83): at
>> > > > android.os.HandlerThread.run(HandlerThread.java:60)
>>
>> > > --
>> > > Regards
>> > > Manjunatha H- 隐藏被引用文字 -
>>
>> > > - 显示引用的文字 -
>>
>> --
>> Regards
>> Manjunatha H- 隐藏被引用文字 -
>>
>> - 显示引用的文字 -
> >
>
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