private Bitmap ReadArgb(int xOffset, int yOffset, int xSize, int ySize, Band first, Dataset set)
{
if (set.RasterCount < 4)
{
throw new GdalException(
"ARGB Format was indicated but there are only " +
set.RasterCount +
" bands!");
}
Band first_o;
Band red_o;
Band green_o;
Band blue_o;
Band red = set.GetRasterBand(2);
Band green = set.GetRasterBand(3);
Band blue = set.GetRasterBand(4);
int width = xSize;
int height = ySize;
if (first.GetOverviewCount() > 0 && _overview >= 0)
{
first_o = first.GetOverview(_overview);
red_o = red.GetOverview(_overview);
green_o = green.GetOverview(_overview);
blue_o = blue.GetOverview(_overview);
}
else
{
first_o = first;
red_o = red;
green_o = green;
blue_o = blue;
}
if (xOffset + width > first_o.XSize)
{
width = first_o.XSize - xOffset;
}
if (yOffset + height > first_o.YSize)
{
height = first_o.YSize - yOffset;
}
Bitmap result = new Bitmap(width, height, PixelFormat.Format32bppArgb);
byte[] a = new byte[width * height];
byte[] r = new byte[width * height];
byte[] g = new byte[width * height];
byte[] b = new byte[width * height];
first_o.ReadRaster(0, 0, width, height, a, width, height, 0, 0);
red_o.ReadRaster(0, 0, width, height, r, width, height, 0, 0);
green_o.ReadRaster(0, 0, width, height, g, width, height, 0, 0);
blue_o.ReadRaster(0, 0, width, height, b, width, height, 0, 0);
// Alpha disposed in caller
red.Dispose();
green.Dispose();
blue.Dispose();
BitmapData bData =
result.LockBits(new Rectangle(0, 0, width, height),
ImageLockMode.ReadWrite,
PixelFormat.Format32bppArgb);
int stride = Math.Abs(bData.Stride);
byte[] vals = new byte[height * stride];
for (int row = 0; row < height; row++)
{
for (int col = 0; col < width; col++)
{
vals[row * stride + col * 4] =
b[row * width + col];
vals[row * stride + col * 4 + 1] =
g[row * width + col];
vals[row * stride + col * 4 + 2] =
r[row * width + col];
vals[row * stride + col * 4 + 3] =
a[row * width + col];
}
}
Marshal.Copy(vals, 0, bData.Scan0, vals.Length);
result.UnlockBits(bData);
return result;
}
private Bitmap ReadRgb(int xOffset, int yOffset, int xSize, int ySize, Band first, Dataset set)
{
if (set.RasterCount < 3)
{
throw new GdalException(
"RGB Format was indicated but there are only " +
set.RasterCount +
" bands!");
}
Band first_o;
Band green_o;
Band blue_o;
Band green = set.GetRasterBand(2);
Band blue = set.GetRasterBand(3);
int width = xSize;
int height = ySize;
if (first.GetOverviewCount() > 0 && _overview >= 0)
{
first_o = first.GetOverview(_overview);
green_o = green.GetOverview(_overview);
blue_o = blue.GetOverview(_overview);
}
else
{
first_o = first;
green_o = green;
blue_o = blue;
}
if (xOffset + width > first_o.XSize)
{
width = first_o.XSize - xOffset;
}
if (yOffset + height > first_o.YSize)
{
height = first_o.YSize - yOffset;
}
Bitmap result = new Bitmap(width, height, PixelFormat.Format32bppArgb);
//byte[] r;
if (r == null || r.Length != width * height)
{
r = new byte[width * height];
}
if (g == null || g.Length != width * height)
{
g = new byte[width * height];
}
if (b == null || b.Length != width * height)
{
b = new byte[width * height];
}
if (vals == null || vals.Length != width * height * 4)
{
vals = new byte[width * height * 4];
}
first_o.ReadRaster(xOffset, yOffset, width, height, r, width, height, 0, 0);
green_o.ReadRaster(xOffset, yOffset, width, height, g, width, height, 0, 0);
blue_o.ReadRaster(xOffset, yOffset, width, height, b, width, height, 0, 0);
/* alternative way to call gdal
unsafe
{
fixed (byte* p = r)
{
IntPtr ptr = (IntPtr)p;
first_o.ReadRaster(xOffset, yOffset, width, height, ptr, width, height, DataType.GDT_Byte, 0, 0);
}
fixed (byte* p = g)
{
IntPtr ptr = (IntPtr)p;
green_o.ReadRaster(xOffset, yOffset, width, height, ptr, width, height, DataType.GDT_Byte, 0, 0);
}
fixed (byte* p = b)
{
IntPtr ptr = (IntPtr)p;
blue_o.ReadRaster(xOffset, yOffset, width, height, ptr, width, height, DataType.GDT_Byte, 0, 0);
}
}*/
//first disposed in caller
green.Dispose();
blue.Dispose();
BitmapData bData =
result.LockBits(new Rectangle(0, 0, width, height),
ImageLockMode.ReadWrite,
PixelFormat.Format32bppArgb);
int stride = Math.Abs(bData.Stride);
for (int row = 0; row < height; row++)
{
for (int col = 0; col < width; col++)
{
vals[row * stride + col * 4] = b[row * width + col];
vals[row * stride + col * 4 + 1] = g[row * width + col];
vals[row * stride + col * 4 + 2] = r[row * width + col];
vals[row * stride + col * 4 + 3] = 255;
}
}
Marshal.Copy(vals, 0, bData.Scan0, vals.Length);
result.UnlockBits(bData);
//vals = null;
//r = null;
//g = null;
//b = null;
return result;
}
private Bitmap ReadGrayIndex(int xOffset, int yOffset, int xSize, int ySize, Band first)
{
Band first_o;
int width = xSize;
int height = ySize;
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;
}
Bitmap result = new Bitmap(width, height, PixelFormat.Format32bppArgb);
byte[] r = new byte[width * height];
first.ReadRaster(xOffset, yOffset, width, height, r, width, height, 0, 0);
BitmapData bData =
result.LockBits(new Rectangle(0, 0, xSize, ySize),
ImageLockMode.ReadWrite,
PixelFormat.Format32bppArgb);
int stride = Math.Abs(bData.Stride);
byte[] vals = new byte[height * stride];
for (int row = 0; row < height; row++)
{
for (int col = 0; col < width; col++)
{
byte value = r[row * width + col];
vals[row * stride + col * 4] = value;
vals[row * stride + col * 4 + 1] = value;
vals[row * stride + col * 4 + 2] = value;
vals[row * stride + col * 4 + 3] = 255;
}
}
Marshal.Copy(vals, 0, bData.Scan0, vals.Length);
result.UnlockBits(bData);
return result;
}
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;
}
/// <summary>
/// Gets the dimensions of the original (0) plus any overlays.
/// The overlays get smaller as the index gets larger..
/// </summary>
/// <returns></returns>
public Size[] GetSizes()
{
EnsureDatasetOpen();
_red = _dataset.GetRasterBand(1);
int numOverviews = _red.GetOverviewCount();
Debug.WriteLine("Num overviews:" + numOverviews);
if (numOverviews == 0) return null;
Size[] result = new Size[numOverviews + 1];
result[0] = new Size(_red.XSize, _red.YSize);
for (int i = 0; i < numOverviews; i++)
{
Band temp = _red.GetOverview(i);
result[i + 1] = new Size(temp.XSize, temp.YSize);
}
return result;
}
/// <summary>
/// Gets the size of the whole image, but doesn't keep the image open unless it was already open.
/// </summary>
private void ReadHeader()
{
EnsureDatasetOpen();
double[] test = new double[6];
_dataset.GetGeoTransform(test);
Bounds = new RasterBounds(_dataset.RasterYSize, _dataset.RasterXSize, test);
_red = _dataset.GetRasterBand(1);
_numOverviews = _red.GetOverviewCount();
Close();
}
