I have a CALayer subclass and I'm drawing into it using Core Image. I'm taking
a CGImage, blurring, and adding a darkened radial gradient on top of it. Pretty
simple. Now the weird thing is, using Core Image for drawing this image
(instead of just drawing with no effects using CGContextDrawImage) increases my
app's memory usage by 30 MB. That almost doubles the entire usage of my app.
It's not like I'm leaking any memory here, so why the large permanent increase?
I'd like to avoid it if I can because I'm getting criticized for "using too
much memory" despite it not being my fault. :-p
- (void)drawInContext:(CGContextRef)theContext
{
CIImage * image = [CIImage
imageWithCGImage:(CGImageRef)self.backgroundImage];
CGRect imageRect = [image extent];
CIFilter * blur = [CIFilter filterWithName:@"CIGaussianBlur"];
[blur setValue:image forKey:@"inputImage"];
[blur setValue:[NSNumber numberWithInt:2]
forKey:@"inputRadius"];
CIFilter * gradient = [CIFilter
filterWithName:@"CIRadialGradient"];
CGPoint center = CGPointMake(CGRectGetMidX(imageRect),
CGRectGetMidY(imageRect));
[gradient setValue:[CIVector vectorWithX:center.x Y:center.y]
forKey:@"inputCenter"];
[gradient setValue:[NSNumber numberWithInt:0.0]
forKey:@"inputRadius0"];
[gradient setValue:[NSNumber numberWithInt:600.0]
forKey:@"inputRadius1"];
[gradient setValue:[CIColor colorWithRed:0.0 green:0.0 blue:0.0
alpha:0.3] forKey:@"inputColor0"];
[gradient setValue:[CIColor colorWithRed:0.0 green:0.0 blue:0.0
alpha:0.6] forKey:@"inputColor1"];
CIContext * context = [CIContext
contextWithCGContext:theContext options:NULL];
CGRect extent = [image extent];
[context drawImage:[blur valueForKey:@"outputImage"]
inRect:self.bounds fromRect:extent];
[context drawImage:[gradient valueForKey:@"outputImage"]
inRect:self.bounds fromRect:extent];
}
--
Seth Willits
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