Class: WirisPlugin::ImageFormatControllerPng

Inherits:
Object
  • Object
show all
Extended by:
ImageFormatControllerInterface
Includes:
Wiris
Defined in:
lib/com/wiris/plugin/impl/ImageFormatControllerPng.rb

Instance Method Summary collapse

Methods included from ImageFormatControllerInterface

ImageFormatController

Constructor Details

#initialize ⇒ ImageFormatControllerPng 



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# File 'lib/com/wiris/plugin/impl/ImageFormatControllerPng.rb', line 9

def initialize()
  super()
end

Instance Method Details

#getContentType ⇒ Object 



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# File 'lib/com/wiris/plugin/impl/ImageFormatControllerPng.rb', line 12

def getContentType()
  return "image/png"
end

#getMetrics(bytes, ref_output) ⇒ Object 



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# File 'lib/com/wiris/plugin/impl/ImageFormatControllerPng.rb', line 15

def getMetrics(bytes,ref_output)
  output = ref_output
  width = 0
  height = 0
  dpi = 0
  baseline = 0
  bi = BytesInput.new(bytes)
  n = bytes::length()
  alloc = 10
  b = Bytes::alloc(alloc)
  bi::readBytes(b,0,8)
  n-= 8
  while n>0
    len = bi::readInt32()
    typ = bi::readInt32()
    if typ==1229472850
      width = bi::readInt32()
      height = bi::readInt32()
      bi::readInt32()
      bi::readByte()
    else 
      if typ==1650545477
        baseline = bi::readInt32()
      else 
        if typ==1883789683
          dpi = bi::readInt32()
          dpi = (Math::round(dpi/39.37))
          bi::readInt32()
          bi::readByte()
        else 
          if len>alloc
            alloc = len
            b = Bytes::alloc(alloc)
          end
          bi::readBytes(b,0,len)
        end
      end
    end
    bi::readInt32()
    n-= len+12
  end
  if output!=nil
    PropertiesTools::setProperty(output,"width",""+width.to_s)
    PropertiesTools::setProperty(output,"height",""+height.to_s)
    PropertiesTools::setProperty(output,"baseline",""+baseline.to_s)
    if dpi!=96
      PropertiesTools::setProperty(output,"dpi",""+dpi.to_s)
    end
    r = ""
  else 
    r = (((("&cw="+width.to_s)+"&ch=")+height.to_s)+"&cb=")+baseline.to_s
    if dpi!=96
      r = (r+"&dpi=")+dpi.to_s
    end
  end
  return r
end