Module: Sjpeg

Defined in:
lib/sjpeg.rb,
lib/sjpeg/version.rb

Constant Summary collapse

VERSION = 
"0.1.3"

Class Method Summary collapse

Class Method Details

.compress(pixels, width, height, quality: 70) ⇒ Object 



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# File 'lib/sjpeg.rb', line 6

def self.compress(pixels, width, height, quality: 70)
  in_pointer = FFI::MemoryPointer.new(:uint8, pixels.size)
  in_pointer.write_array_of_uint8(pixels)
  out_pointer = FFI::MemoryPointer.new(:pointer)
  out_size_t = Unstable.SjpegCompress(
    in_pointer,
    width,
    height,
    quality,
    out_pointer,
  )
  out_result = out_pointer.get_pointer(0)
  result = out_result.read_array_of_uint8(out_size_t)
  Unstable.SjpegFreeBuffer(out_result)

  "data:image/jpeg;base64," + Base64.encode64(result.pack('C*')).split("\n").join
ensure
  in_pointer.free if in_pointer
end