Hello,
I think you can do something like this:
1. Create a BufferedImage of appropriate type (say, INT_RGB)
2. get the array from the DataBuffer
(((DataBufferInt)(BI.getRaster().getDataBuffer())).getData() in case
of INT_[A]RGB image type) and pass it to the native code
3. At the native level, use GetPrimitiveArrayCritical to get the
pointer to the data, copy your image data
4. Render your BufferedImage at the java level
This is more or less what Swing does when rendering the native Look
and Feels.
Note that in this case the resulting BufferedImage will not be
HW-accelerated - that is, cached in vram. You can do it by yourself
by creating a VolatileImage and copying the BI to the VI, and then VI
to the screen - this makes sense only if you don't update the BI
on every frame and the cached VI can give you an advantage, though.
Thanks,
Dmitri
On Wed, May 10, 2006 at 02:52:38PM -0700, [EMAIL PROTECTED] wrote:
> I have a need to get image data from native code to a Java Image, e.g. a
> BufferedImage, in the most efficient manner possible.
>
> Ideally I would like to write to the BufferedImage's raster directly in my
> native code, or get an image from a DirectByteBuffer of RGB pixel data. If
> I can reuse the same Image object multiple times to avoid excessive garbage
> creation that would be best.
>
> I'm looking for options and pointers on how I should implement such a thing
> while avoiding as much as possible any data copying. It is likely that my
> data will need to be converted from YUV color space to RGB color space and I
> would like for that to be the only time the data is copied. So I would
> convert directly into the BufferedImage with my native color conversion (and
> in some cases scaler) loop which is already optimized with SIMD assembler.
>
> Thanks in advance.
> [Message sent by forum member 'swpalmer' (swpalmer)]
>
> http://forums.java.net/jive/thread.jspa?messageID=112638
>
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