public static Pixelmap ConstructFromBitmap(Bitmap bmp, byte[] bitmapData, TangraConfig.ColourChannel channel)
{
uint[] pixels = new uint[bmp.Width * bmp.Height];
byte[] displayBitmapPixels = new byte[bmp.Width * bmp.Height];
// NOTE: Those 2 for loops are very slow. Need performance improvements
for (int y = 0; y < bmp.Height; ++y)
{
for (int x = 0; x < bmp.Width; ++x)
{
byte val = bitmapData[(x + (bmp.Height - 1 - y) * bmp.Width) * 3];
pixels[x + y * bmp.Width] = val;
displayBitmapPixels[x + y * bmp.Width] = val;
}
}
return(new Pixelmap(bmp.Width, bmp.Height, 8, pixels, bmp, displayBitmapPixels));
}
public static Pixelmap ConstructFromBitmap(Bitmap bmp, TangraConfig.ColourChannel channel)
{
uint[] pixels = new uint[bmp.Width * bmp.Height];
byte[] displayBitmapPixels = new byte[bmp.Width * bmp.Height];
// GDI+ still lies to us - the return format is BGR, NOT RGB.
BitmapData bmData = bmp.LockBits(new Rectangle(0, 0, bmp.Width, bmp.Height), ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb);
int stride = bmData.Stride;
System.IntPtr Scan0 = bmData.Scan0;
unsafe
{
byte *p = (byte *)(void *)Scan0;
int nOffset = stride - bmp.Width * 3;
for (int y = 0; y < bmp.Height; ++y)
{
for (int x = 0; x < bmp.Width; ++x)
{
byte blue = p[0];
byte green = p[1];
byte red = p[2];
byte val = GetColourChannelValue(channel, red, green, blue);
pixels[x + y * bmp.Width] = val;
displayBitmapPixels[x + y * bmp.Width] = val;
p += 3;
}
p += nOffset;
}
}
bmp.UnlockBits(bmData);
return(new Pixelmap(bmp.Width, bmp.Height, 8, pixels, bmp, displayBitmapPixels));
}
public static byte GetColourChannelValue(TangraConfig.ColourChannel channel, byte red, byte green, byte blue)
{
if (channel == TangraConfig.ColourChannel.GrayScale)
{
return((byte)(.299 * red + .587 * green + .114 * blue));
}
else if (channel == TangraConfig.ColourChannel.Red)
{
return(red);
}
else if (channel == TangraConfig.ColourChannel.Green)
{
return(green);
}
else if (channel == TangraConfig.ColourChannel.Blue)
{
return(blue);
}
throw new ArgumentOutOfRangeException();
}
public static int GetColourByteOffset32bbp(TangraConfig.ColourChannel channel)
{
if (channel == TangraConfig.ColourChannel.GrayScale)
{
// Special meaning
return(-1);
}
// BGRT
switch (channel)
{
case TangraConfig.ColourChannel.Red:
return(2);
case TangraConfig.ColourChannel.Green:
return(1);
case TangraConfig.ColourChannel.Blue:
return(0);
}
return(1);
}
