Painting images using PixelWriter

[Kevin Rushforth]

No, this is not possible since we do not expose the rendering thread, 
and anything that directly touched the copy being used for rendering 
would not be a good idea. I doubt that this extra copy will be an issue 
in most cases.

One possible future improvement would be to have some way for you to 
pass in a buffer "by reference" with the understanding that once you do, 
you cannot touch it until it is "released". This would allow an app to 
double-buffer a pair of NIO buffers, filling one while FX was uploading 
the other to a texture.

-- Kevin


Tobias Bley (UltraMixer) wrote:
> HI Jasper,
>
> do you think it would be possible to change this to one shared buffer? IMO thats the big advantage of NIO buffers. So we could get a much better performance when showing webcam images or video frames. So I could query the webcam by JNI and fill in a Java IO buffer which is rendered by JavaFX. But if there is a need to copy the complete image every 40ms (framerate 25fps) the performance could be poor.
>
> Best regards,
> Tobi
>
>
> --
> Tobias Bley
> Geschäftsführer/ Managing Director
>
> ------------------------------------------------------------------------
>
> UltraMixer Digital Audio Solutions
> Schillerstrasse 29
> 01326 Dresden
>
> -------------------------------------------------------------------------
> info at ultramixer.com 	      	 http://www.ultramixer.com
>
> Am 04.06.2012 um 22:17 schrieb Jasper Potts:
>
>   
>> Hi,
>>
>> There will always be at minimum one copy operation because JavaFX runs on two threads. So at the point when you set pixels a copy will be made so it can be safe to access that new copy from our internal render thread. So you can have your own ByteBuffer access from native and every time you call setPixels a copy will be taken for the JavaFX platform to use. So you will need to make sure the content is static during that setPixels (copy) operation.
>>
>> Jasper
>>
>> On Jun 4, 2012, at 2:06 AM, Tobias Bley wrote:
>>
>>     
>>> Hi,
>>>
>>> since JFX 2.2 there is the new class PixelWriter. Would it be possible to draw Images like from a webcam using a shared ByteBuffer (or IntBuffer)? Wo what I would like to do is to fill a shared ByteBuffer from C (with JNI) and use the same bytebuffer for the JavaFX Image object....
>>>
>>> Best regards,
>>> Tobi
>>>
>>>
>>>
>>> -- 
>>> Tobias Bley
>>> Chief Executive Officer
>>>
>>> --------------------------------------------------------
>>>
>>> UltraMixer Digital Audio Solutions
>>> Schillerstraße  29
>>> D-01326 Dresden
>>> Germany
>>>
>>> --------------------------------------------------------
>>> bley at ultramixer.com   http://www.ultramixer.com
>>>
>>>
>>>
>>>       
>
>