Class: ZXing::FFI::Reader

Inherits:
Object
  • Object
show all
Includes:
Reader
Defined in:
lib/zxing/ffi/reader.rb

Instance Attribute Summary

Attributes included from Reader

#native

Instance Method Summary collapse

Constructor Details

#initialize(ptr) ⇒ Reader

Returns a new instance of Reader.



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# File 'lib/zxing/ffi/reader.rb', line 6

def initialize ptr
  super ZXing::FFI::Library::ReaderPointer.new ptr
end

Instance Method Details

#decode(bitmap, hints = nil) ⇒ Object 



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# File 'lib/zxing/ffi/reader.rb', line 10

def decode bitmap, hints = nil
  hints ||= {}
  th = hints[:try_harder]
  hints.delete :try_harder
  native_hints = nil
  if hints.empty?
    native_hints = ZXing::FFI::Library::DecodeHintsPointer.new(ZXing::FFI::Library.DecodeHints_default)
  else
    native_hints = ZXing::FFI::Library::DecodeHintsPointer.new(ZXing::FFI::Library.DecodeHints_new(0))
    hints.each do |k, v|
      case k
      when :possible_formats
        v.each do |format|
          case format 
          when :DATA_MATRIX
            ZXing::FFI::Library.
              DecodeHints_setDataMatrix native_hints, true
          else
            raise "implement hint for #{format}"
          end
        end
      else
        raise "implement #{k} #{v}"
      end
    end
  end
  if th
    ZXing::FFI::Library.DecodeHints_setTryHarder native_hints, th
  end
  # p @native, bitmap.native, native_hints
  ptr = ZXing::FFI::Library.Reader_decode @native, bitmap.native, native_hints
  # p ptr
  if (ptr.address & 1) != 0
    ptr = FFI::Pointer.new(ptr.address & ~1)
    ptrs = ptr.read_array_of_pointer 2

    className = ptrs[0].read_string.sub(%r{^zxing},"ZXing")
    what = ptrs[1].read_string

    ZXing::FFI::Library.free ptrs[1]
    ZXing::FFI::Library.free ptr

    cls = className.split("::").inject(Object) { |parent, child| parent.const_get(child) }

    raise cls.new what
  end
  ZXing::Result.new ZXing::FFI::Library::ResultPointer.new ptr
end