private BufferedImage CreateCompatibleDestImage(BufferedImage src, ColorModel destCM, ColorSpace destCS)
{
BufferedImage image;
if (destCM == null)
{
ColorModel srcCM = src.ColorModel;
int nbands = destCS.NumComponents;
bool hasAlpha = srcCM.HasAlpha();
if (hasAlpha)
{
nbands += 1;
}
int[] nbits = new int[nbands];
for (int i = 0; i < nbands; i++)
{
nbits[i] = 8;
}
destCM = new ComponentColorModel(destCS, nbits, hasAlpha, srcCM.AlphaPremultiplied, srcCM.Transparency, DataBuffer.TYPE_BYTE);
}
int w = src.Width;
int h = src.Height;
image = new BufferedImage(destCM, destCM.CreateCompatibleWritableRaster(w, h), destCM.AlphaPremultiplied, null);
return(image);
}
/// <summary>
/// Creates a zeroed destination image with the correct size and number of
/// bands. If destCM is <code>null</code>, an appropriate
/// <code>ColorModel</code> will be used. </summary>
/// <param name="src"> Source image for the filter operation. </param>
/// <param name="destCM"> the destination's <code>ColorModel</code>, which
/// can be <code>null</code>. </param>
/// <returns> a filtered destination <code>BufferedImage</code>. </returns>
public virtual BufferedImage CreateCompatibleDestImage(BufferedImage src, ColorModel destCM)
{
BufferedImage image;
int w = src.Width;
int h = src.Height;
int transferType = DataBuffer.TYPE_BYTE;
if (destCM == null)
{
ColorModel cm = src.ColorModel;
Raster raster = src.Raster;
if (cm is ComponentColorModel)
{
DataBuffer db = raster.DataBuffer;
bool hasAlpha = cm.HasAlpha();
bool isPre = cm.AlphaPremultiplied;
int trans = cm.Transparency;
int[] nbits = null;
if (Ltable is ByteLookupTable)
{
if (db.DataType == db.TYPE_USHORT)
{
// Dst raster should be of type byte
if (hasAlpha)
{
nbits = new int[2];
if (trans == cm.BITMASK)
{
nbits[1] = 1;
}
else
{
nbits[1] = 8;
}
}
else
{
nbits = new int[1];
}
nbits[0] = 8;
}
// For byte, no need to change the cm
}
else if (Ltable is ShortLookupTable)
{
transferType = DataBuffer.TYPE_USHORT;
if (db.DataType == db.TYPE_BYTE)
{
if (hasAlpha)
{
nbits = new int[2];
if (trans == cm.BITMASK)
{
nbits[1] = 1;
}
else
{
nbits[1] = 16;
}
}
else
{
nbits = new int[1];
}
nbits[0] = 16;
}
}
if (nbits != null)
{
cm = new ComponentColorModel(cm.ColorSpace, nbits, hasAlpha, isPre, trans, transferType);
}
}
image = new BufferedImage(cm, cm.CreateCompatibleWritableRaster(w, h), cm.AlphaPremultiplied, null);
}
else
{
image = new BufferedImage(destCM, destCM.CreateCompatibleWritableRaster(w, h), destCM.AlphaPremultiplied, null);
}
return(image);
}
