image show error

[junzhang]

Dear sir,
when l cross-compile Qt5.8 for armv7 platform, and it's show app ok.
when l slide the touchpanel, the picture of app can slide too, but when l slide picture A to pucture B, the panel show error, the panel left show a half of picture A and right show a half of picture B, so, l click on touchpanel, it's show picture B,
when l get the data of framebuffer in panel driver, and to convert to picture, it's still show compound by picture A and B.
so, l guset it may be error for picture synthesis in Qt, pls help me how to solve this question. thanks !

[jsulm]

@junzhang Sorry, it is not clear what you are talking about.
Can you show your code, so we can see how you show the pictures?

[junzhang]

@jsulm
the code and picture in http://pan.baidu.com/s/1boSIEkB , the passwd is xj26
the panel show picture A, then l slide the panel, it shoud be show picute B, but it show error_picture.bmp.

[junzhang]

@jsulm
would you please help me to where is error, thank you