#import "GPUImageTwoPassTextureSamplingFilter.h"
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// For each pixel, this sets it to the maximum value of the red channel in a rectangular neighborhood extending out dilationRadius pixels from the center.
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// This extends out bright features, and is most commonly used with black-and-white thresholded images.
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extern NSString *const kGPUImageDilationRadiusOneVertexShaderString;
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extern NSString *const kGPUImageDilationRadiusTwoVertexShaderString;
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extern NSString *const kGPUImageDilationRadiusThreeVertexShaderString;
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extern NSString *const kGPUImageDilationRadiusFourVertexShaderString;
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@interface GPUImageDilationFilter : GPUImageTwoPassTextureSamplingFilter
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// Acceptable values for dilationRadius, which sets the distance in pixels to sample out from the center, are 1, 2, 3, and 4.
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- (id)initWithRadius:(NSUInteger)dilationRadius;
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@end
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