private static void WritePaletteBuffered(Bitmap value, int xOffset, int yOffset, Band first)
{
ColorTable ct = first.GetRasterColorTable();
if (ct == null)
{
throw new GdalException("Image was stored with a palette interpretation but has no color table.");
}
if (ct.GetPaletteInterpretation() != PaletteInterp.GPI_RGB)
{
throw new GdalException("Only RGB palette interpretation is currently supported by this " +
" plug-in, " + ct.GetPaletteInterpretation() + " is not supported.");
}
int width = value.Width;
int height = value.Height;
BitmapData bData = value.LockBits(new Rectangle(0, 0, width, height),
ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
int stride = Math.Abs(bData.Stride);
byte[] r = new byte[stride * height];
Marshal.Copy(bData.Scan0, r, 0, r.Length);
value.UnlockBits(bData);
byte[] vals = new byte[width * height];
byte[][] colorTable = new byte[ct.GetCount()][];
for (int i = 0; i < ct.GetCount(); i++)
{
ColorEntry ce = ct.GetColorEntry(i);
colorTable[i] = new[]
{
(byte) ce.c3, (byte) ce.c2, (byte) ce.c1,
(byte) ce.c4
};
}
for (int row = 0; row < height; row++)
{
for (int col = 0; col < width; col++)
{
vals[row * width + col] = MatchColor(r, row * stride + col * 4, colorTable);
}
}
first.WriteRaster(xOffset, yOffset, width, height, vals, width, height, 0, 0);
}
private Bitmap ReadPaletteBuffered(int xOffset, int yOffset, int xSize, int ySize, Band first)
{
ColorTable ct = first.GetRasterColorTable();
if (ct == null)
{
throw new GdalException("Image was stored with a palette interpretation but has no color table.");
}
if (ct.GetPaletteInterpretation() != PaletteInterp.GPI_RGB)
{
throw new GdalException("Only RGB palette interpretation is currently supported by this " +
" plug-in, " + ct.GetPaletteInterpretation() + " is not supported.");
}
Band first_o;
int width = xSize;
int height = ySize;
byte[] r = new byte[width * height];
if (first.GetOverviewCount() > 0 && _overview >= 0)
{
first_o = first.GetOverview(_overview);
}
else
{
first_o = first;
}
if (xOffset + width > first_o.XSize)
{
width = first_o.XSize - xOffset;
}
if (yOffset + height > first_o.YSize)
{
height = first_o.YSize - yOffset;
}
first_o.ReadRaster(xOffset, yOffset, width, height, r, width, height, 0, 0);
Bitmap result = new Bitmap(width, height, PixelFormat.Format32bppArgb);
BitmapData bData = result.LockBits(new Rectangle(0, 0, width, height),
ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb);
int stride = Math.Abs(bData.Stride);
const int bpp = 4;
byte[] vals = new byte[stride * height];
byte[][] colorTable = new byte[ct.GetCount()][];
for (int i = 0; i < ct.GetCount(); i++)
{
ColorEntry ce = ct.GetColorEntry(i);
colorTable[i] = new[]
{
(byte) ce.c3, (byte) ce.c2, (byte) ce.c1,
(byte) ce.c4
};
}
for (int row = 0; row < height; row++)
{
for (int col = 0; col < width; col++)
{
Array.Copy(colorTable[r[col + row * stride]], 0, vals,
row * stride + col * bpp, 4);
}
}
Marshal.Copy(vals, 0, bData.Scan0, vals.Length);
result.UnlockBits(bData);
return result;
}