/// <summary>
/// Encodes and writes raster data, together with alpha (transparency) data,
/// as a 32-bit bitmap.
/// </summary>
/// <param name="raster">
/// the source raster data </param>
/// <param name="alpha">
/// the source alpha data </param>
private void Write32(Raster raster, Raster alpha)
{
int width = raster.getWidth();
int height = raster.getHeight();
// write lines
for (int y = height - 1; y >= 0; y--)
{
// write pixel data for each line
for (int x = 0; x < width; x++)
{
// get RGBA values
byte r = (byte)raster.getSample(x, y, 0);
byte g = (byte)raster.getSample(x, y, 1);
byte b = (byte)raster.getSample(x, y, 2);
byte a = (byte)alpha.getSample(x, y, 0);
// write RGBA values
writer.Write(b);
writer.Write(g);
writer.Write(r);
writer.Write(a);
}
}
}
/// <summary>
/// Encodes and writes raster data as a 24-bit bitmap.
/// </summary>
/// <param name="raster">
/// the source raster data </param>
private void Write24(Raster raster)
{
int width = raster.getWidth();
int height = raster.getHeight();
// calculate bytes per line
int bytesPerLine = GetBytesPerLine24(width);
// write lines
for (int y = height - 1; y >= 0; y--)
{
// write pixel data for each line
for (int x = 0; x < width; x++)
{
// get RGB values for pixel
byte r = (byte)raster.getSample(x, y, 0);
byte g = (byte)raster.getSample(x, y, 1);
byte b = (byte)raster.getSample(x, y, 2);
// write RGB values
writer.Write(b);
writer.Write(g);
writer.Write(r);
}
// write padding bytes at end of line
for (int i = width * 3; i < bytesPerLine; i++)
{
writer.Write((byte)0);
}
}
}
/// <summary>
/// Encodes and writes raster data as a 4-bit bitmap.
/// </summary>
/// <param name="raster">
/// the source raster data </param>
private void Write4(Raster raster)
{
int width = raster.getWidth();
int height = raster.getHeight();
// calculate bytes per line
int bytesPerLine = GetBytesPerLine4(width);
// line buffer
byte[] line = new byte[bytesPerLine];
// encode and write lines
for (int y = height - 1; y >= 0; y--)
{
// clear line buffer
for (int i = 0; i < bytesPerLine; i++)
{
line[i] = 0;
}
// encode raster data for line
for (int x = 0; x < width; x++)
{
// calculate buffer index
int bi = x / 2;
// calculate nibble index (high order or low order)
int i = x % 2;
// get color index
int index = raster.getSample(x, y, 0);
// set color index in buffer
line[bi] = SetNibble(line[bi], i, index);
}
// write line data (padding bytes included)
writer.Write(line);
}
}
/// <summary>
/// Encodes and writes raster data as an 8-bit bitmap.
/// </summary>
/// <param name="raster">
/// the source raster data </param>
private void Write8(Raster raster)
{
int width = raster.getWidth();
int height = raster.getHeight();
// calculate bytes per line
int bytesPerLine = GetBytesPerLine8(width);
// write lines
for (int y = height - 1; y >= 0; y--)
{
// write raster data for each line
for (int x = 0; x < width; x++)
{
// get color index for pixel
byte index = (byte)raster.getSample(x, y, 0);
// write color index
writer.Write(index);
}
// write padding bytes at end of line
for (int i = width; i < bytesPerLine; i++)
{
writer.Write((byte)0);
}
}
}
/// <summary>
/// Encodes and writes raster data as a 1-bit bitmap.
/// </summary>
/// <param name="raster">
/// the source raster data </param>
private void Write1(Raster raster)
{
int bytesPerLine = GetBytesPerLine1(raster.getWidth());
byte[] line = new byte[bytesPerLine];
for (int y = raster.getHeight() - 1; y >= 0; y--)
{
for (int i = 0; i < bytesPerLine; i++)
{
line[i] = 0;
}
for (int x = 0; x < raster.getWidth(); x++)
{
int bi = x / 8;
int i = x % 8;
int index = raster.getSample(x, y, 0);
line[bi] = SetBit(line[bi], i, index);
}
writer.Write(line);
}
}