Method: UIImage#masked

Defined in:
lib/sugarcube-image/uiimage.rb

#masked(mask_image) ⇒ Object

The mask image cannot have ANY transparency. Instead, transparent areas must be white or some value between black and white. The more white a pixel is the more transparent it becomes. black .. white opaque .. transparent



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# File 'lib/sugarcube-image/uiimage.rb', line 430

def masked(mask_image)
  mask_image = mask_image.CGImage

  width = CGImageGetWidth(mask_image)
  height = CGImageGetHeight(mask_image)
  component_bits = CGImageGetBitsPerComponent(mask_image)
  pixel_bits = CGImageGetBitsPerPixel(mask_image)
  row_bytes = CGImageGetBytesPerRow(mask_image)
  data_provider = CGImageGetDataProvider(mask_image)

  mask = CGImageMaskCreate(width, height, component_bits,
    pixel_bits, row_bytes, data_provider,nil, false)

  masked = CGImageCreateWithMask(self.CGImage, mask)
  UIImage.imageWithCGImage(masked, scale:self.scale, orientation:self.imageOrientation)
end