Lose a part of content in the screen when use VirtualSurfaceImageSource

Question

I use VirtualSurfaceImageSource in my application like Direct2D magazine app sample.

    1,   I modify "ContentImageSource.cpp" file in that sample following:

          In Line 36: modify "m_imageSource = ref new VirtualSurfaceImageSource(m_contentSize.cx, m_contentSize.cy, m_isOpaque);"

          to "m_imageSource = ref new VirtualSurfaceImageSource(m_contentSize.cx * 4, contentSize.cy* 4, m_isOpaque);".

    2,   Build this sample, and run it in the simulator.

    3,   When i drag the view to the second page.

    4,   When i touch the page with a finger(put your a finger on screen, do not lift), a part of the page disappears sometimes.  but no happen in the first page.

    5,   When i lift my finger, the disappeared part will appeare.

Now I do not know why the page flickering when i tap the second page, 

who can tell me why? if how to avoid the flickering.

And any ideas why this is happening? 

Thank you very much.

---King Star

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winRT

Answer 1

In Addition:

I test  Direct2D magazine app sample.

do not modify the sample. And test use Touch Display.

 When i drag the view to the second page.

When i touch the page with a finger(put your a finger on screen, do not lift), a part of the page disappears sometimes.  but no happen in the first page.

When i lift my finger, the disappeared part will appeare.

touch before, picture is：

when  touch the page with a finger(put your a finger on screen, do not lift),  the picture is：

thanks .

----King Star

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winRT

Answer 2

Hi,

I cannot reproduce your issue on my side.
In the first situation, I can see the background image is 1/4 part of screen.

I can not see the second result on my simulator.

Best regards,
Jesse

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Jesse Jiang [MSFT]
MSDN Community Support | Feedback to us

Answer 3

Hi,

I cannot reproduce your issue on my side.
In the first situation, I can see the background image is 1/4 part of screen.

I can not see the second result on my simulator.

Best regards,
Jesse

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Jesse Jiang [MSFT]
MSDN Community Support | Feedback to us

Hi Jesse.

Thanks for your reply.

In the first situation, the background image is 1/4 part of screen.

         When you drag to the second page,

         Try to touch the second page with your finger(not mouse pointer, put your a finger on screen, do not lift),

         a part of the page disappears sometimes.  

         but no happen in the first page.

         When i lift my finger, the disappeared part will appeare.

         use simulator test the first situation, touch before, picture is：

when  touch the page with a finger(put your a finger on screen, do not lift),  the picture is：

 The second situation:

 you had better test it in Touch Display,

 if test it with simulator , that happens rarely.

 I wait your anwser . Thanks again.

----King Star.

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winRT