/// <summary>
/// Performs a convolution on BufferedImages. Each component of the
/// source image will be convolved (including the alpha component, if
/// present).
/// 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.
/// The IllegalArgumentException may be thrown if the source is the
/// same as the destination. </summary>
/// <param name="src"> the source <code>BufferedImage</code> to filter </param>
/// <param name="dst"> the destination <code>BufferedImage</code> for the
/// filtered <code>src</code> </param>
/// <returns> the filtered <code>BufferedImage</code> </returns>
/// <exception cref="NullPointerException"> if <code>src</code> is <code>null</code> </exception>
/// <exception cref="IllegalArgumentException"> if <code>src</code> equals
/// <code>dst</code> </exception>
/// <exception cref="ImagingOpException"> if <code>src</code> cannot be filtered </exception>
public BufferedImage Filter(BufferedImage src, BufferedImage dst)
{
if (src == null)
{
throw new NullPointerException("src image is null");
}
if (src == dst)
{
throw new IllegalArgumentException("src image cannot be the " + "same as the dst image");
}
bool needToConvert = false;
ColorModel srcCM = src.ColorModel;
ColorModel dstCM;
BufferedImage origDst = dst;
// Can't convolve an IndexColorModel. Need to expand it
if (srcCM is IndexColorModel)
{
IndexColorModel icm = (IndexColorModel)srcCM;
src = icm.ConvertToIntDiscrete(src.Raster, false);
srcCM = src.ColorModel;
}
if (dst == null)
{
dst = CreateCompatibleDestImage(src, null);
dstCM = srcCM;
origDst = dst;
}
else
{
dstCM = dst.ColorModel;
if (srcCM.ColorSpace.Type != dstCM.ColorSpace.Type)
{
needToConvert = true;
dst = CreateCompatibleDestImage(src, null);
dstCM = dst.ColorModel;
}
else if (dstCM is IndexColorModel)
{
dst = CreateCompatibleDestImage(src, null);
dstCM = dst.ColorModel;
}
}
if (ImagingLib.filter(this, src, dst) == null)
{
throw new ImagingOpException("Unable to convolve src image");
}
if (needToConvert)
{
ColorConvertOp ccop = new ColorConvertOp(Hints);
ccop.Filter(dst, origDst);
}
else if (origDst != dst)
{
java.awt.Graphics2D g = origDst.CreateGraphics();
try
{
g.DrawImage(dst, 0, 0, null);
}
finally
{
g.Dispose();
}
}
return(origDst);
}
/// <summary>
/// Transforms the source <CODE>BufferedImage</CODE> and stores the results
/// in the destination <CODE>BufferedImage</CODE>.
/// If the color models for the two images do not match, a color
/// conversion into the destination color model is performed.
/// If the destination image is null,
/// a <CODE>BufferedImage</CODE> is created with the source
/// <CODE>ColorModel</CODE>.
/// <para>
/// The coordinates of the rectangle returned by
/// <code>getBounds2D(BufferedImage)</code>
/// are not necessarily the same as the coordinates of the
/// <code>BufferedImage</code> returned by this method. If the
/// upper-left corner coordinates of the rectangle are
/// negative then this part of the rectangle is not drawn. If the
/// upper-left corner coordinates of the rectangle are positive
/// then the filtered image is drawn at that position in the
/// destination <code>BufferedImage</code>.
/// </para>
/// <para>
/// An <CODE>IllegalArgumentException</CODE> is thrown if the source is
/// the same as the destination.
///
/// </para>
/// </summary>
/// <param name="src"> The <CODE>BufferedImage</CODE> to transform. </param>
/// <param name="dst"> The <CODE>BufferedImage</CODE> in which to store the results
/// of the transformation.
/// </param>
/// <returns> The filtered <CODE>BufferedImage</CODE>. </returns>
/// <exception cref="IllegalArgumentException"> if <code>src</code> and
/// <code>dst</code> are the same </exception>
/// <exception cref="ImagingOpException"> if the image cannot be transformed
/// because of a data-processing error that might be
/// caused by an invalid image format, tile format, or
/// image-processing operation, or any other unsupported
/// operation. </exception>
public BufferedImage Filter(BufferedImage src, BufferedImage dst)
{
if (src == null)
{
throw new NullPointerException("src image is null");
}
if (src == dst)
{
throw new IllegalArgumentException("src image cannot be the " + "same as the dst image");
}
bool needToConvert = false;
ColorModel srcCM = src.ColorModel;
ColorModel dstCM;
BufferedImage origDst = dst;
if (dst == null)
{
dst = CreateCompatibleDestImage(src, null);
dstCM = srcCM;
origDst = dst;
}
else
{
dstCM = dst.ColorModel;
if (srcCM.ColorSpace.Type != dstCM.ColorSpace.Type)
{
int type = Xform.Type;
bool needTrans = ((type & (Xform.TYPE_MASK_ROTATION | Xform.TYPE_GENERAL_TRANSFORM)) != 0);
if (!needTrans && type != Xform.TYPE_TRANSLATION && type != Xform.TYPE_IDENTITY)
{
double[] mtx = new double[4];
Xform.GetMatrix(mtx);
// Check out the matrix. A non-integral scale will force ARGB
// since the edge conditions can't be guaranteed.
needTrans = (mtx[0] != (int)mtx[0] || mtx[3] != (int)mtx[3]);
}
if (needTrans && srcCM.Transparency == java.awt.Transparency_Fields.OPAQUE)
{
// Need to convert first
ColorConvertOp ccop = new ColorConvertOp(Hints);
BufferedImage tmpSrc = null;
int sw = src.Width;
int sh = src.Height;
if (dstCM.Transparency == java.awt.Transparency_Fields.OPAQUE)
{
tmpSrc = new BufferedImage(sw, sh, BufferedImage.TYPE_INT_ARGB);
}
else
{
WritableRaster r = dstCM.CreateCompatibleWritableRaster(sw, sh);
tmpSrc = new BufferedImage(dstCM, r, dstCM.AlphaPremultiplied, null);
}
src = ccop.Filter(src, tmpSrc);
}
else
{
needToConvert = true;
dst = CreateCompatibleDestImage(src, null);
}
}
}
if (InterpolationType_Renamed != TYPE_NEAREST_NEIGHBOR && dst.ColorModel is IndexColorModel)
{
dst = new BufferedImage(dst.Width, dst.Height, BufferedImage.TYPE_INT_ARGB);
}
if (ImagingLib.filter(this, src, dst) == null)
{
throw new ImagingOpException("Unable to transform src image");
}
if (needToConvert)
{
ColorConvertOp ccop = new ColorConvertOp(Hints);
ccop.Filter(dst, origDst);
}
else if (origDst != dst)
{
java.awt.Graphics2D g = origDst.CreateGraphics();
try
{
g.Composite = AlphaComposite.Src;
g.DrawImage(dst, 0, 0, null);
}
finally
{
g.Dispose();
}
}
return(origDst);
}
