I just tested interactively using Ruby-Cocoa and the CIFilter returns a 0x0 image if transparent, and an infinite extent image if opaque:
Yep, same results without Ruby too (not that the runtime would have anything to do with it). Running on both Leopard and Snow Leopard.
Also interesting that non-transparent colors get non-infinite extents (they're gigantic, but finite).
I guess I don't know if this is a CI or a QC bug -- CI's behavior isn't consistent, but potentially not wrong. It might be QC that isn't handling zero-sized images properly... (it treats 0x0 images as no image, just as it treats zero-length strings as non-strings... a gripe I've had since Tiger, personally...)
#import <Cocoa/Cocoa.h>
#import <Quartz/Quartz.h>
int main()
{
NSAutoreleasePool *p = [NSAutoreleasePool new];
CIColor *transparent = [CIColor colorWithRed:0 green:0 blue:0 alpha:0];
CIColor *translucent = [CIColor colorWithRed:0 green:0 blue:0 alpha:
0.5];
CIColor *opaque = [CIColor colorWithRed:0 green:0 blue:0 alpha:1];
CIFilter *constantColor = [CIFilter
filterWithName:@"CIConstantColorGenerator"];
NSLog(@"filter: %@", constantColor);
[constantColor setValue:transparent forKey:@"inputColor"];
CIImage *transparentImage = [constantColor valueForKey:@"outputImage"];
[constantColor setValue:translucent forKey:@"inputColor"];
CIImage *translucentImage = [constantColor valueForKey:@"outputImage"];
[constantColor setValue:opaque forKey:@"inputColor"];
CIImage *opaqueImage = [constantColor valueForKey:@"outputImage"];
NSLog(@"transparent image: %@ (%fx%f)", transparentImage,
[transparentImage extent].size.width, [transparentImage
extent].size.height);
NSLog(@"translucent image: %@ (%fx%f)", translucentImage,
[translucentImage extent].size.width, [translucentImage
extent].size.height);
NSLog(@"opaque image: %@ (%fx%f)", opaqueImage, [opaqueImage
extent].size.width, [opaqueImage extent].size.height);
return 0;
}
compile with gcc ci.m -o ci -framework Cocoa -framework Quartz
produces the following:
2009-10-27 11:16:02.224 ci[16952:10b] filter:
{CIConstantColorGenerator { inputColor = <null>; }}
2009-10-27 11:16:02.227 ci[16952:10b] transparent image: {CIImage:
0x14fa0 extent [inf inf 0 0]; format BGRA_8; null image}
(0.000000x0.000000)
2009-10-27 11:16:02.235 ci[16952:10b] translucent image: {CIImage:
0x14f38 format BGRA_8; fill <CGColor 0x116520>}
(340282346638528859811704183484516925440.000000x340282346638528859811704183484516925440.000000
)
2009-10-27 11:16:02.236 ci[16952:10b] opaque image: {CIImage:0x14ed0
opaque DOD; format BGRA_8; fill <CGColor 0x116570>
(340282346638528859811704183484516925440.000000x340282346638528859811704183484516925440.000000
)
-- [ christopher wright ] [email protected] http://kineme.net/
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