In the frame buffer I create a quad (render to texture). In ortho projection (1:1 to screen space).

Then, I want to show that texture. So I pass it to QSGSimpleTextureNode.

But when I change ImageItem size (my QML element), image jumps (increase/decrease size, seems like uv tex coordinates calculates wrong)... (It is better to see)

Please look attachment.

P.S. In the example, for simplicity, I used old OpenGL commands, but the same behavior with shaders (I guess there is no difference, after all, except "ortho" matrix).