Your QCPlugIn must output a object that conforms to
<QCPlugInOutputImageProvider> on its image port
Then implements -renderToBuffer:withBytesPerRow:pixelFormat:forBounds:
to create a buffer, a CGBitmapContext that wraps it, and finally
render your CG stuff into it
On Jan 29, 2008, at 2:16 PM, Ian Grant wrote:
Hi all,
I need a little push in the right direction on starting a custom
plug in that uses quartz drawing - I've got the parameterized
drawing happening nicely in a separate cocoa application (see image)
but need to understand how an internal routine needs to be organised
to provide an image to either (a) an image output port or (b) to
render directly in a consumer patch. I'd like to do both as a
learning exercise.
<rounded corners.png>
I've read and re-read the docs, cramming with the red book, and the
new "Open-GL programming for mac os X" but the NSImage ->
NSBitmapImageRep -> texture routines in the latter probably don't
apply due to all the convenience methods and context of the QC plugin.
I've also been through the 'histogram operation', 'the rotating
square' and the 'GLImage' example code.
I think I need to create an image buffer (cpu) from the quartz drawing
or find a way to create a gl texture (gpu) from the drawing output.
I note that the GLImage code uses a frame buffer object and an
'internal class' to represent images. I can understand where the gl
code produces the gradient image but as yet haven't found a way to
substitute my drawing image output for the gl textures.
None of the QC plug-in examples use (or convert) from the image
types I know how to provide from my drawing code. They either come
from <QCPlugInInputImageSource> or are generated by GL code - not
provided from cocoa, CI or other bitmap image types.
Any hints for a good way to do this, overviews, sample code or
descriptions would be gratefully received. I am learning a lot, I
sort of get it, but feel a little stuck.
Kind regards,
Ian
*******************************
Ian Grant
Senior Lecturer in Digital Art
Faculty of the Arts
Thames Valley University
Ealing, UK
W5 5DX
<[EMAIL PROTECTED]>
*******************************
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