// 'scale' attribute - default is 0
float scale = convertNumber(filterElement, SVG_SCALE_ATTRIBUTE, 0, ctx);
// 'xChannelSelector' attribute - default is 'A'
ARGBChannel xChannelSelector = convertChannelSelector
(filterElement, SVG_X_CHANNEL_SELECTOR_ATTRIBUTE, ARGBChannel.A,
ctx);
// 'yChannelSelector' attribute - default is 'A'
ARGBChannel yChannelSelector = convertChannelSelector
(filterElement, SVG_Y_CHANNEL_SELECTOR_ATTRIBUTE, ARGBChannel.A,
ctx);
// 'in' attribute
Filter in = getIn(filterElement,