I would like to say that I am not much confortable with the filters implementation I was working on some time ago. I need help to make it work better. I know that there are bugs that are due to my incomplete broken implementation, but I am stuck because I still don't understand exactly how the filters infrastructure work
<br><br>I don&#39;t know how to properly implement zooming, nor rotation. Look at feturbulence. It does not rotate correctly.<br><br><br>I also don&#39;t know whether I am using the best approach. I have used a pixmap buffer where I render the feturbulence effect and I have an &quot;updated&quot; flag. Then, if some parameters are changed (on 
sp-feturbulence.cpp) I set this flag to false. When the render method is called, it checks the updated flag and only recalculates the effect when the updated flag is false (and then sets it to true).<br><br>When zooming, I will have to free the current pixmap buffer and create another one of greater size and recalculate it. It seems to me that zooming will have great slowdowns if I continue working that way. Any body know any kind of &quot;design pattern&quot; that I should be using to implement the zooming? I feel that I am walking the&nbsp; wrong way. And I keep scared about the possibility of not being able to fix these filters before next release deadline. So, what I mean is that I really need help to make this stuff work alright.
<br><br>Felipe Sanches, &quot;JucaBlues&quot;<br>