int ufoProcessIsRasterInDefined( ufoProcess process_instance, int input_index);
ufoProcesslsRasterInDefined inquires if an optional raster input is connected and set.
These functions should be called for those inputs that have been set optional by ufoProcessSetRasterInOptional to see if the input has been connected and selected.
ufoProcesslsRasterInDefined may be called within ufoProcessRenderPixel, ufoProcessRenderLine, ufoProcessRenderRectangle, ufoProcessCanAvoidRendering, ufoProcessPreRender, ufoProcessPostRender, ufoProcessPreRenderPass, ufoProcessPostRenderPass, ufoProcessCalcDefinedRectangle, ufoProcessCalcNeedRectangles, ufoProcessCalcDefinedPixelTypes, and ufoProcessSpecifyConvertPixelTypes.
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