text: #import "GPUImageFilter.h"
  
  @interface GPUImageCropFilter : GPUImageFilter
  {
      GLfloat cropTextureCoordinates[8];
  }
  
  // The crop region is the rectangle within the image to crop. It is normalized to a coordinate space from 0.0 to 1.0, with 0.0, 0.0 being the upper left corner of the image
  @property(readwrite, nonatomic) CGRect cropRegion;
  
  // Initialization and teardown
  - (id)initWithCropRegion:(CGRect)newCropRegion;
  
  @end
  