On May 31, 2010, at 5:40 PM, Robert Lorentz wrote:
> CGContextRef context = CGBitmapContextCreate(rawData, width, height,
> bitsPerComponent, bytesPerRow, colorSpace, kCGBitmapFloatComponents);
>
> CGColorSpaceRelease(colorSpace);
>
> // draw the CIImage to the 'context'... this is probably the line that's wrong
> [image drawInRect:NSMakeRect(0, 0, width, height) fromRect:[self bounds]
> operation:NSCompositeSourceIn fraction 1.0];
You created a context, but you never told AppKit to draw into it, so it’s just
drawing into whatever the current context is at that moment.
You’ll need to do something like this:
NSGraphicsContext *nsContext = [NSGraphicsContext
graphicsContextWithGraphicsPort: context flipped: NO];
NSGraphicsContext saveGraphicsState];
[NSGraphicsContext setCurrentContext: nsContext];
[image drawInRect: ……..];
[NSGraphicsContext restoreGraphicsState];
I’ve never actually tried doing this, so I’m not certain the above code will
work, but it looks as though it should.
—Jens_______________________________________________
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