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

Returns a new instance of ImageFormatControllerPng.



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# File 'lib/com/wiris/plugin/impl/ImageFormatControllerPng.rb', line 10

def initialize()
    super()
end

Instance Method Details

#getContentType ⇒ Object 



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# File 'lib/com/wiris/plugin/impl/ImageFormatControllerPng.rb', line 13

def getContentType()
    return "image/png"
end

#getMetrics(bytes, ref_output) ⇒ Object 



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# File 'lib/com/wiris/plugin/impl/ImageFormatControllerPng.rb', line 16

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

#scalateMetrics(dpi, metrics) ⇒ Object 



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# File 'lib/com/wiris/plugin/impl/ImageFormatControllerPng.rb', line 73

def scalateMetrics(dpi, metrics)
    f = 96/dpi
    metrics::set("width",(f*metrics::get("width")))
    metrics::set("height",(f*metrics::get("height")))
    metrics::set("baseline",(f*metrics::get("baseline")))
end