/// <summary>
/// Performs a lookup operation on a <code>BufferedImage</code>.
/// If the color model in the source image is not the same as that
/// in the destination image, the pixels will be converted
/// in the destination. If the destination image is <code>null</code>,
/// a <code>BufferedImage</code> will be created with an appropriate
/// <code>ColorModel</code>. An <code>IllegalArgumentException</code>
/// might be thrown if the number of arrays in the
/// <code>LookupTable</code> does not meet the restrictions
/// stated in the class comment above, or if the source image
/// has an <code>IndexColorModel</code>. </summary>
/// <param name="src"> the <code>BufferedImage</code> to be filtered </param>
/// <param name="dst"> the <code>BufferedImage</code> in which to
/// store the results of the filter operation </param>
/// <returns> the filtered <code>BufferedImage</code>. </returns>
/// <exception cref="IllegalArgumentException"> if the number of arrays in the
/// <code>LookupTable</code> does not meet the restrictions
/// described in the class comments, or if the source image
/// has an <code>IndexColorModel</code>. </exception>
public BufferedImage Filter(BufferedImage src, BufferedImage dst)
{
ColorModel srcCM = src.ColorModel;
int numBands = srcCM.NumColorComponents;
ColorModel dstCM;
if (srcCM is IndexColorModel)
{
throw new IllegalArgumentException("LookupOp cannot be " + "performed on an indexed image");
}
int numComponents = Ltable.NumComponents;
if (numComponents != 1 && numComponents != srcCM.NumComponents && numComponents != srcCM.NumColorComponents)
{
throw new IllegalArgumentException("Number of arrays in the " + " lookup table (" + numComponents + " is not compatible with the " + " src image: " + src);
}
bool needToConvert = false;
int width = src.Width;
int height = src.Height;
if (dst == null)
{
dst = CreateCompatibleDestImage(src, null);
dstCM = srcCM;
}
else
{
if (width != dst.Width)
{
throw new IllegalArgumentException("Src width (" + width + ") not equal to dst width (" + dst.Width + ")");
}
if (height != dst.Height)
{
throw new IllegalArgumentException("Src height (" + height + ") not equal to dst height (" + dst.Height + ")");
}
dstCM = dst.ColorModel;
if (srcCM.ColorSpace.Type != dstCM.ColorSpace.Type)
{
needToConvert = true;
dst = CreateCompatibleDestImage(src, null);
}
}
BufferedImage origDst = dst;
if (ImagingLib.filter(this, src, dst) == null)
{
// Do it the slow way
WritableRaster srcRaster = src.Raster;
WritableRaster dstRaster = dst.Raster;
if (srcCM.HasAlpha())
{
if (numBands - 1 == numComponents || numComponents == 1)
{
int minx = srcRaster.MinX;
int miny = srcRaster.MinY;
int[] bands = new int[numBands - 1];
for (int i = 0; i < numBands - 1; i++)
{
bands[i] = i;
}
srcRaster = srcRaster.CreateWritableChild(minx, miny, srcRaster.Width, srcRaster.Height, minx, miny, bands);
}
}
if (dstCM.HasAlpha())
{
int dstNumBands = dstRaster.NumBands;
if (dstNumBands - 1 == numComponents || numComponents == 1)
{
int minx = dstRaster.MinX;
int miny = dstRaster.MinY;
int[] bands = new int[numBands - 1];
for (int i = 0; i < numBands - 1; i++)
{
bands[i] = i;
}
dstRaster = dstRaster.CreateWritableChild(minx, miny, dstRaster.Width, dstRaster.Height, minx, miny, bands);
}
}
Filter(srcRaster, dstRaster);
}
if (needToConvert)
{
// ColorModels are not the same
ColorConvertOp ccop = new ColorConvertOp(Hints);
ccop.Filter(dst, origDst);
}
return(origDst);
}
/// <summary>
/// Rescales the source BufferedImage.
/// If the color model in the source image is not the same as that
/// in the destination image, the pixels will be converted
/// in the destination. If the destination image is null,
/// a BufferedImage will be created with the source ColorModel.
/// An IllegalArgumentException may be thrown if the number of
/// scaling factors/offsets in this object does not meet the
/// restrictions stated in the class comments above, or if the
/// source image has an IndexColorModel. </summary>
/// <param name="src"> the <code>BufferedImage</code> to be filtered </param>
/// <param name="dst"> the destination for the filtering operation
/// or <code>null</code> </param>
/// <returns> the filtered <code>BufferedImage</code>. </returns>
/// <exception cref="IllegalArgumentException"> if the <code>ColorModel</code>
/// of <code>src</code> is an <code>IndexColorModel</code>,
/// or if the number of scaling factors and offsets in this
/// <code>RescaleOp</code> do not meet the requirements
/// stated in the class comments. </exception>
public BufferedImage Filter(BufferedImage src, BufferedImage dst)
{
ColorModel srcCM = src.ColorModel;
ColorModel dstCM;
int numBands = srcCM.NumColorComponents;
if (srcCM is IndexColorModel)
{
throw new IllegalArgumentException("Rescaling cannot be " + "performed on an indexed image");
}
if (Length != 1 && Length != numBands && Length != srcCM.NumComponents)
{
throw new IllegalArgumentException("Number of scaling constants " + "does not equal the number of" + " of color or color/alpha " + " components");
}
bool needToConvert = false;
// Include alpha
if (Length > numBands && srcCM.HasAlpha())
{
Length = numBands + 1;
}
int width = src.Width;
int height = src.Height;
if (dst == null)
{
dst = CreateCompatibleDestImage(src, null);
dstCM = srcCM;
}
else
{
if (width != dst.Width)
{
throw new IllegalArgumentException("Src width (" + width + ") not equal to dst width (" + dst.Width + ")");
}
if (height != dst.Height)
{
throw new IllegalArgumentException("Src height (" + height + ") not equal to dst height (" + dst.Height + ")");
}
dstCM = dst.ColorModel;
if (srcCM.ColorSpace.Type != dstCM.ColorSpace.Type)
{
needToConvert = true;
dst = CreateCompatibleDestImage(src, null);
}
}
BufferedImage origDst = dst;
//
// Try to use a native BI rescale operation first
//
if (ImagingLib.filter(this, src, dst) == null)
{
//
// Native BI rescale failed - convert to rasters
//
WritableRaster srcRaster = src.Raster;
WritableRaster dstRaster = dst.Raster;
if (srcCM.HasAlpha())
{
if (numBands - 1 == Length || Length == 1)
{
int minx = srcRaster.MinX;
int miny = srcRaster.MinY;
int[] bands = new int[numBands - 1];
for (int i = 0; i < numBands - 1; i++)
{
bands[i] = i;
}
srcRaster = srcRaster.CreateWritableChild(minx, miny, srcRaster.Width, srcRaster.Height, minx, miny, bands);
}
}
if (dstCM.HasAlpha())
{
int dstNumBands = dstRaster.NumBands;
if (dstNumBands - 1 == Length || Length == 1)
{
int minx = dstRaster.MinX;
int miny = dstRaster.MinY;
int[] bands = new int[numBands - 1];
for (int i = 0; i < numBands - 1; i++)
{
bands[i] = i;
}
dstRaster = dstRaster.CreateWritableChild(minx, miny, dstRaster.Width, dstRaster.Height, minx, miny, bands);
}
}
//
// Call the raster filter method
//
Filter(srcRaster, dstRaster);
}
if (needToConvert)
{
// ColorModels are not the same
ColorConvertOp ccop = new ColorConvertOp(Hints);
ccop.Filter(dst, origDst);
}
return(origDst);
}
