iPhone SDK - CGBitmapContextCreate

I would like to create an image of my own. I already k开发者_如何学JAVAnow its width (320*2 = 640) and height (427).

So I have some raw data :

unsigned char *rawImg = malloc(height * width * 4 *2 );

Then, I will fill it :)

Then, I have to do something like that to get a bitmap and return a (UIImage *) :

ctx = CGBitmapContextCreate(rawImg,width*2,height,8,
    ???,
    ???,
    kCGImageAlphaPremultipliedLast); 

UIImage * imgFinal = [UIImage imageWithCGImage:CGBitmapContextCreateImage(ctx)];
CGContextRelease(ctx); 



return imgFinal;

But I don't know how to create my context ctx, as you can see with the "???", even tough I read the documentation...

Please help ! Thanks :)

See Apple's CGBitmapContext documentation.

If you are using 4 bytes per pixel, then your bytes per row might be your half_width * 2 * 4.

Color space might be:

CGColorSpaceRef    colorSpace = CGColorSpaceCreateDeviceRGB();

You can obtain the current CGContextRef using

CGContextRef context =UIGraphicsGetCurrentContext()