Hi Jean,
Thank you so much for your help. I've almost got the code in place
now. But please see below.
On 23 Jan 2009, at 17:33, Jean-Daniel Dupas wrote:
Also at this point, I'd like to get a pointer to the Pixel buffer
in the CGContext and return this. The code I already have will
write the JPEG file, all I need is a copy of the Pixel Data? Is
there a way to do this?
myImageBufferPtr is the pixel buffer.
To create the image, you can also use an NSImage,
NSImage *img = [[NSImage alloc] initWithSize:NSMakeSize
(myImageWidth, myImageHeight)];
[img lockFocus]
CGContextRef ctxt = [[NSGraphicsContext currentContext] graphicPort];
// draw
[img unlockFocus]
And now, use NSImage function to save it as a JPEG. It's easier
than dealing with all the bitmap stuff.
An other way may be to use CGBitmapContextCreateImage() to create a
CGImageRef from your context, and then use ImageIO
(CGImageDestinationRef) to export your image.
The requirement of the function I am writing has now changed because
I found a different way of doing it that requires much less changes
to the rest of the application. Basically there is a framework of
sorts that calls my function (GetIconImage), all I have to do is to
render the Icon into a BitMap/PixMap and then return a pointer to it
from my function, e.g. the function that calls my function need to
return a buffer that is width * height * 4 in size that contains the
pixels and everything else will be taken care of!
So, I if change the bit that computes the Row Bytes value so it is
(width * 4) and change the malloc to malloc(width * height * 4) then
just return myImageBufferPtr, this should be ok?
Also, how to I free the memory allocated by myBitMapContextRef,
myIconRef and myIconFamily Icon? I can't seem to find dispose/release
functions for these objects.
Thanks again, you have been a great help!
All the Best
Dave
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