/// <summary> Creates a ROIScaler object. The Quantizer is the source of data to
/// scale.
///
/// <p>The ROI Scaler creates a ROIMaskGenerator depending on what ROI
/// information is in the ParameterList. If only rectangular ROI are used,
/// the fast mask generator for rectangular ROI can be used.</p>
///
/// </summary>
/// <param name="src">The source of data to scale
///
/// </param>
/// <param name="pl">The parameter list (or options).
///
/// </param>
/// <param name="encSpec">The encoder specifications for addition of roi specs
///
/// </param>
/// <exception cref="IllegalArgumentException">If an error occurs while parsing
/// the options in 'pl'
///
/// </exception>
public static ROIScaler createInstance(Quantizer src, ParameterList pl, EncoderSpecs encSpec)
{
System.Collections.ArrayList roiVector = System.Collections.ArrayList.Synchronized(new System.Collections.ArrayList(10));
ROIMaskGenerator maskGen = null;
// Check parameters
pl.checkList(OPT_PREFIX, CSJ2K.j2k.util.ParameterList.toNameArray(pinfo));
// Get parameters and check if there are and ROIs specified
System.String roiopt = pl.getParameter("Rroi");
if (roiopt == null)
{
// No ROIs specified! Create ROIScaler with no mask generator
return new ROIScaler(src, null, false, - 1, false, encSpec);
}
// Check if the lowest resolution levels should belong to the ROI
int sLev = pl.getIntParameter("Rstart_level");
// Check if the ROIs are block-aligned
bool useBlockAligned = pl.getBooleanParameter("Ralign");
// Check if generic mask generation is specified
bool onlyRect = !pl.getBooleanParameter("Rno_rect");
// Parse the ROIs
parseROIs(roiopt, src.NumComps, roiVector);
ROI[] roiArray = new ROI[roiVector.Count];
roiVector.CopyTo(roiArray);
// If onlyRect has been forced, check if there are any non-rectangular
// ROIs specified. Currently, only the presence of circular ROIs will
// make this false
if (onlyRect)
{
for (int i = roiArray.Length - 1; i >= 0; i--)
if (!roiArray[i].rect)
{
onlyRect = false;
break;
}
}
if (onlyRect)
{
// It's possible to use the fast ROI mask generation when only
// rectangular ROIs are specified.
maskGen = new RectROIMaskGenerator(roiArray, src.NumComps);
}
else
{
// It's necessary to use the generic mask generation
maskGen = new ArbROIMaskGenerator(roiArray, src.NumComps, src);
}
return new ROIScaler(src, maskGen, true, sLev, useBlockAligned, encSpec);
}
/// <summary> The constructor of the arbitrary mask generator
///
/// </summary>
/// <param name="rois">The ROI info.
///
/// </param>
/// <param name="nrc">The number of components
///
/// </param>
/// <param name="src">The quantizer module
///
/// </param>
public ArbROIMaskGenerator(ROI[] rois, int nrc, Quantizer src):base(rois, nrc)
{
roiMask = new int[nrc][];
this.src = src;
}
/// <summary> Constructor of the ROI scaler, takes a Quantizer as source of data to
/// scale.
///
/// </summary>
/// <param name="src">The quantizer that is the source of data.
///
/// </param>
/// <param name="mg">The mask generator that will be used for all components
///
/// </param>
/// <param name="roi">Flag indicating whether there are rois specified.
///
/// </param>
/// <param name="sLev">The resolution levels that belong entirely to ROI
///
/// </param>
/// <param name="uba">Flag indicating whether block aligning is used.
///
/// </param>
/// <param name="encSpec">The encoder specifications for addition of roi specs
///
/// </param>
public ROIScaler(Quantizer src, ROIMaskGenerator mg, bool roi, int sLev, bool uba, EncoderSpecs encSpec):base(src)
{
this.src = src;
this.roi = roi;
this.useStartLevel = sLev;
if (roi)
{
// If there is no ROI, no need to do this
this.mg = mg;
roiMask = new DataBlkInt();
calcMaxMagBits(encSpec);
blockAligned = uba;
}
}