/// <summary>
/// Writes the <tt>IconEntry</tt> structure to output
/// </summary>
private int WriteIconEntry(BufferedImage img, int fileOffset)
{
// Width 1 byte Cursor Width (16, 32 or 64)
int width = img.getWidth();
writer.Write((byte)(width == 256 ? 0 : width));
// Height 1 byte Cursor Height (16, 32 or 64 , most commonly = Width)
int height = img.getHeight();
writer.Write((byte)(height == 256 ? 0 : height));
// ColorCount 1 byte Number of Colors (2,16, 0=256)
short BitCount = (short)img.getColorModel().getPixelSize();
int NumColors = 1 << (BitCount == 32 ? 24 : (int)BitCount);
byte ColorCount = (byte)(NumColors >= 256 ? 0 : NumColors);
writer.Write((byte)ColorCount);
// Reserved 1 byte =0
writer.Write((byte)0);
// Planes 2 byte =1
writer.Write((short)1);
// BitCount 2 byte bits per pixel (1, 4, 8)
writer.Write((short)BitCount);
// SizeInBytes 4 byte Size of (InfoHeader + ANDbitmap + XORbitmap)
int cmapSize = GetColorMapSize(BitCount);
int xorSize = GetBitmapSize(width, height, BitCount);
int andSize = GetBitmapSize(width, height, 1);
int size = 40 + cmapSize + xorSize + andSize;
writer.Write(size);
// FileOffset 4 byte FilePos, where InfoHeader starts
writer.Write(fileOffset);
return size;
}
private void WriteXorBitmap(BufferedImage img)
{
Raster raster = img.getRaster();
switch (img.getColorModel().getPixelSize())
{
case 1:
Write1(raster);
break;
case 4:
Write4(raster);
break;
case 8:
Write8(raster);
break;
case 24:
Write24(raster);
break;
case 32:
Raster alpha = img.getAlphaRaster();
Write32(raster, alpha);
break;
}
}
/// <summary>
/// Writes the <tt>InfoHeader</tt> structure to output
///
/// </summary>
private void WriteInfoHeader(BufferedImage img)
{
// Size of InfoHeader structure = 40
writer.Write(40);
// Width
writer.Write(img.getWidth());
// Height
writer.Write(img.getHeight() * 2);
// Planes (=1)
writer.Write((short)1);
// Bit count
writer.Write((short)img.getColorModel().getPixelSize());
// Compression
writer.Write(0);
// Image size - compressed size of image or 0 if Compression = 0
writer.Write(0);
// horizontal resolution pixels/meter
writer.Write(0);
// vertical resolution pixels/meter
writer.Write(0);
// Colors used - number of colors actually used
writer.Write(0);
// Colors important - number of important colors 0 = all
writer.Write(0);
}
/// <summary>
/// Encodes the <em>AND</em> bitmap for the given image according the its
/// alpha channel (transparency) and writes it to the given output.
/// </summary>
/// <param name="img">
/// the image to encode as the <em>AND</em> bitmap. </param>
private void WriteAndBitmap(BufferedImage img)
{
WritableRaster alpha = img.getAlphaRaster();
// indexed transparency (eg. GIF files)
if (img.getColorModel() is IndexColorModel && img.getColorModel().hasAlpha())
{
int w = img.getWidth();
int h = img.getHeight();
int bytesPerLine = GetBytesPerLine1(w);
byte[] line = new byte[bytesPerLine];
IndexColorModel icm = (IndexColorModel)img.getColorModel();
Raster raster = img.getRaster();
for (int y = h - 1; y >= 0; y--)
{
for (int x = 0; x < w; x++)
{
int bi = x / 8;
int i = x % 8;
// int a = alpha.getSample(x, y, 0);
int p = raster.getSample(x, y, 0);
int a = icm.getAlpha(p);
// invert bit since and mask is applied to xor mask
int b = ~a & 1;
line[bi] = SetBit(line[bi], i, b);
}
writer.Write(line);
}
}
// no transparency
else if (alpha == null)
{
int h = img.getHeight();
int w = img.getWidth();
// calculate number of bytes per line, including 32-bit padding
int bytesPerLine = GetBytesPerLine1(w);
byte[] line = new byte[bytesPerLine];
for (int i = 0; i < bytesPerLine; i++)
{
line[i] = (byte)0;
}
for (int y = h - 1; y >= 0; y--)
{
writer.Write(line);
}
}
// transparency (ARGB, etc. eg. PNG)
else
{
int w = img.getWidth();
int h = img.getHeight();
int bytesPerLine = GetBytesPerLine1(w);
byte[] line = new byte[bytesPerLine];
for (int y = h - 1; y >= 0; y--)
{
for (int x = 0; x < w; x++)
{
int bi = x / 8;
int i = x % 8;
int a = alpha.getSample(x, y, 0);
// invert bit since and mask is applied to xor mask
int b = ~a & 1;
line[bi] = SetBit(line[bi], i, b);
}
writer.Write(line);
}
}
}
