private static Bitmap MakeBitmapPalettized(int width, int height, byte[] buffer, Palette palette)
{
var bitmap = new Bitmap(width, height, PixelFormat.Format8bppIndexed);
var bitmapPalette = bitmap.Palette;
for (int i = 0; i < palette.Colors.Length; i++)
{
var abgr = palette.Colors[i];
uint b = (abgr & 0x00FF0000) >> 16;
uint r = (abgr & 0x000000FF) << 16;
var argb = (int)((abgr & 0xFF00FF00) | b | r);
bitmapPalette.Entries[i] = Color.FromArgb(argb);
}
bitmap.Palette = bitmapPalette;
var area = new Rectangle(0, 0, bitmap.Width, bitmap.Height);
var data = bitmap.LockBits(area, ImageLockMode.WriteOnly, bitmap.PixelFormat);
Marshal.Copy(buffer, 0, data.Scan0, width * height);
bitmap.UnlockBits(data);
return(bitmap);
}
private static byte[] ExportPalettized(Texture texture, Palette palette)
{
if (texture.BitsPerPixel != 4 && texture.BitsPerPixel != 8)
{
throw new NotSupportedException();
}
var data = new byte[texture.TotalWidth * texture.TotalHeight * 4];
int x = 0;
int y = 0;
int blockLength = (int)(texture.BlockWidth * texture.BlockHeight * (texture.BitsPerPixel / 8.0f));
for (int i = 0; i < texture.Data.Length; i += blockLength)
{
var block = new byte[blockLength];
Array.Copy(texture.Data, i, block, 0, Math.Min(blockLength, texture.Data.Length - i));
int rx = 0;
int ry = 0;
for (int j = 0; j < block.Length; j++)
{
if (texture.BitsPerPixel == 8)
{
if (ry >= texture.BlockHeight)
{
throw new InvalidOperationException();
}
int o = ((y + ry) * texture.TotalWidth) + (x + rx);
data[o] = block[j];
rx++;
if (rx >= texture.BlockWidth)
{
rx = 0;
ry++;
}
}
else if (texture.BitsPerPixel == 4)
{
// a
{
if (ry >= texture.BlockHeight)
{
throw new InvalidOperationException();
}
int o = ((y + ry) * texture.TotalWidth) + (x + rx);
data[o] = (byte)((block[j] & 0x0F) >> 0);
rx++;
if (rx >= texture.BlockWidth)
{
rx = 0;
ry++;
}
}
// b
{
if (ry >= texture.BlockHeight)
{
throw new InvalidOperationException();
}
int o = ((y + ry) * texture.TotalWidth) + (x + rx);
data[o] = (byte)((block[j] & 0xF0) >> 4);
rx++;
if (rx >= texture.BlockWidth)
{
rx = 0;
ry++;
}
}
}
}
x += texture.BlockWidth;
if (x >= texture.TotalWidth)
{
x = 0;
y += texture.BlockHeight;
}
}
return(data);
}
