static Bitmap ConvertCompressedOcadIcon(byte[] bytes)
{
byte[] compressed = new byte[248];
byte[] uncompressed = new byte[22 * 22];
Array.Copy(bytes, 16, compressed, 0, 248);
LZWCompression compressor = new LZWCompression();
compressor.Expand(compressed, uncompressed);
return ConvertOcad9Icon(uncompressed);
}
// Convert an image into an OCAD icon bits.
byte[] ImageToOcadIcon(Image image, int version)
{
Bitmap bitmap = new Bitmap(24, 24, PixelFormat.Format24bppRgb);
Graphics g = Graphics.FromImage(bitmap);
g.Clear(Color.White);
g.DrawImage(image, new Rectangle(0, 0, 24, 24));
g.Dispose();
if (version <= 7) {
// ocad 6, 7 -- 4 bit color
byte[] array = new byte[264];
for (int row = 1; row <= 22; ++row)
for (int col = 1; col <= 22; col += 2) {
int colorIndex1 = NearestOcadColor(bitmap.GetPixel(col, row), false);
int colorIndex2 = NearestOcadColor(bitmap.GetPixel(col + 1, row), false);
array[(22 - row) * 12 + (col - 1) / 2] = (byte) ((colorIndex1 << 4) + colorIndex2);
}
return array;
}
else {
// ocad 8/9 -- 8 bit color
byte[] uncompressed = new byte[22 * 22];
for (int row = 1; row <= 22; ++row)
for (int col = 1; col <= 22; ++col) {
int colorIndex = NearestOcadColor(bitmap.GetPixel(col, row), true);
uncompressed[(22-row) * 22 + (col - 1)] = colorIndex > 128 ? (byte)0 : (byte) colorIndex;
}
if (version == 8) {
// OCAD 8 -- compressed.
byte[] array = new byte[264];
byte[] compressed = new byte[264 - 16];
for (int i = 0; i < compressed.Length; ++i)
compressed[i] = 0xFF;
LZWCompression compressor = new LZWCompression();
compressor.Compress(uncompressed, compressed);
Array.Copy(compressed, 0, array, 16, compressed.Length);
for (int i = 0; i < 16; ++i)
array[i] = 0xFF;
return array;
}
else {
// OCAD 9 -- uncompressed
return uncompressed;
}
}
}
