QC: 出力ありの場合のパッチ

出力周りをいろいろさぼろうと悩んできたけどHistogramの例の通り書くしかなさげ．（本当に？）

MyQCPlugIn.h

…
@interface OutputImageProvider : NSObject <QCPlugInOutputImageProvider> 
{ 
 id<QCPlugInInputImageSource> _image; 
} 
- (id) initWithImageSource:(id)image; 
@end 
@interface MyQCPlugIn : QCPlugIn
{
}
@property(assign) id<QCPlugInInputImageSource>  inputSourceImage; 
@property(assign) id<QCPlugInOutputImageProvider> outputResultImage; 
@end

MyQCPlugin.m

…
@implementation MyQCPlugIn
@dynamic inputSourceImage, outputResultImage;
…
- (BOOL) execute:(id<QCPlugInContext>)context atTime:(NSTimeInterval)time withArguments:(NSDictionary*)arguments
{
 id  image;
 if(image= self.inputSourceImage) { 
  OutputImageProvider* provider = [[OutputImageProvider alloc] initWithImageSource:image]; 
  if(provider == nil) 
   return NO; 
  self.outputResultImage = provider; 
  [provider release]; 
 } 
 else 
  self.outputResultImage = nil; 
 return YES; 
}
…
@end
@implementation OutputImageProvider
- (id) initWithImageSource:(id<QCPlugInInputImageSource>)image 
{ 
 if(!image) { 
  [self release]; 
  return nil; 
 } 
 if(self = [super init]) { 
  _image = [(id)image retain]; 
 } 
 return self; 
} 
- (void) dealloc 
{ 
 [(id)_image release]; 
 [super dealloc]; 
} 
- (NSRect) imageBounds 
{ 
 return [_image imageBounds]; 
} 
- (CGColorSpaceRef) imageColorSpace 
{ 
 return [_image imageColorSpace]; 
} 
- (NSArray*) supportedBufferPixelFormats 
{ 
 return [NSArray arrayWithObjects:QCPlugInPixelFormatARGB8, 
   QCPlugInPixelFormatBGRA8, 
   QCPlugInPixelFormatRGBAf, 
   nil]; 
} 
- (BOOL) renderToBuffer:(void*)baseAddress 
  withBytesPerRow:(NSUInteger)rowBytes 
   pixelFormat:(NSString*)format 
     forBounds:(NSRect)bounds 
{ 
 vImage_Buffer inBuffer, outBuffer; 
 if(![_image lockBufferRepresentationWithPixelFormat:format 
            colorSpace:[_image imageColorSpace] 
             forBounds:bounds]) 
  return NO; 

 inBuffer.data = (void*)[_image bufferBaseAddress]; 
 inBuffer.rowBytes = [_image bufferBytesPerRow]; 
 inBuffer.width = [_image bufferPixelsWide]; 
 inBuffer.height = [_image bufferPixelsHigh]; 
 outBuffer.data = baseAddress; 
 outBuffer.rowBytes = rowBytes; 
 outBuffer.width = [_image bufferPixelsWide]; 
 outBuffer.height = [_image bufferPixelsHigh]; 

 {
  memcpy(outBuffer.data, inBuffer.data, inBuffer.rowBytes * inBuffer.height);
 }
 [_image unlockBufferRepresentation]; 
 return YES; 
} 
@end

間違いやお気づきの点がありましたらコメントもらえるとうれしいです．