public static Image DecodeWithBump(byte[] buffer, out byte[] bump, bool decodebump = true)
{
if (!J2cInit.m_Inited)
{
J2cInit.InitOpenJP2();
}
bump = null;
int width;
int height;
int channels;
int channelwidth;
int[] red;
int[] green;
int[] blue;
int[] alpha = null;
{
/* shorten the j2c decode context variable visibility here */
IntPtr ptr = J2cDecode(buffer, buffer.Length);
if (ptr == IntPtr.Zero)
{
throw new J2cDecodingFailedException();
}
try
{
width = J2cDecodedGetWidth(ptr);
height = J2cDecodedGetHeight(ptr);
channels = J2cDecodedGetChannels(ptr);
if (channels == 0)
{
throw new J2cDecodingFailedException();
}
channelwidth = width * height;
red = new int[channelwidth];
alpha = null;
switch (channels)
{
case 1:
Marshal.Copy(J2cDecodedGetScan0(ptr, 0), red, 0, channelwidth);
green = red;
blue = red;
break;
case 2:
Marshal.Copy(J2cDecodedGetScan0(ptr, 0), red, 0, channelwidth);
green = red;
blue = red;
alpha = new int[channelwidth];
Marshal.Copy(J2cDecodedGetScan0(ptr, 1), alpha, 0, channelwidth);
break;
case 3:
green = new int[channelwidth];
blue = new int[channelwidth];
Marshal.Copy(J2cDecodedGetScan0(ptr, 0), red, 0, channelwidth);
Marshal.Copy(J2cDecodedGetScan0(ptr, 1), green, 0, channelwidth);
Marshal.Copy(J2cDecodedGetScan0(ptr, 2), blue, 0, channelwidth);
break;
default:
alpha = new int[channelwidth];
Marshal.Copy(J2cDecodedGetScan0(ptr, 3), alpha, 0, channelwidth);
goto case 3;
}
if (channels > 4 && decodebump)
{
bump = new byte[channelwidth];
var ibump = new int[channelwidth];
Marshal.Copy(J2cDecodedGetScan0(ptr, 4), ibump, 0, channelwidth);
for (int i = 0; i < channelwidth; ++i)
{
bump[i] = (byte)ibump[i];
}
}
}
finally
{
J2cDecodedFree(ptr);
}
}
/* transform input channels to actual Image data */
byte[] imagedata;
int destpos = 0;
PixelFormat destformat;
if (alpha != null)
{
destformat = PixelFormat.Format32bppArgb;
imagedata = new byte[channelwidth * 4];
for (int i = 0; i < channelwidth; ++i)
{
imagedata[destpos++] = (byte)blue[i];
imagedata[destpos++] = (byte)green[i];
imagedata[destpos++] = (byte)red[i];
imagedata[destpos++] = (byte)alpha[i];
}
}
else
{
destformat = PixelFormat.Format24bppRgb;
imagedata = new byte[channelwidth * 3];
for (int i = 0; i < channelwidth; ++i)
{
imagedata[destpos++] = (byte)blue[i];
imagedata[destpos++] = (byte)green[i];
imagedata[destpos++] = (byte)red[i];
}
}
/* no using here, we are returning it */
var bmp = new Bitmap(width, height, destformat);
/* put the decoded image into it */
BitmapData lockBits = bmp.LockBits(new Rectangle(0, 0, width, height), ImageLockMode.ReadWrite, destformat);
Marshal.Copy(imagedata, 0, lockBits.Scan0, imagedata.Length);
bmp.UnlockBits(lockBits);
return(bmp);
}
public static byte[] EncodeWithBump(Bitmap img, bool lossless, byte[] bumpdata)
{
if (!J2cInit.m_Inited)
{
J2cInit.InitOpenJP2();
}
int imgChannelWidth = img.Width * img.Height;
if (bumpdata.Length != imgChannelWidth)
{
throw new ArgumentException("bumpdata does not match channel byte size");
}
const int channels = 5;
byte[] datastream;
if (img.PixelFormat == PixelFormat.Format32bppArgb)
{
datastream = new byte[imgChannelWidth * channels];
int pixpos = 0;
int bumppos = 0;
for (int y = 0; y < img.Height; ++y)
{
for (int x = 0; x < img.Width; ++x)
{
Color c = img.GetPixel(x, y);
datastream[pixpos++] = c.R;
datastream[pixpos++] = c.G;
datastream[pixpos++] = c.B;
datastream[pixpos++] = c.A;
datastream[pixpos++] = bumpdata[bumppos++];
}
}
}
else if (img.PixelFormat == PixelFormat.Format24bppRgb)
{
datastream = new byte[imgChannelWidth * channels];
int pixpos = 0;
int bumppos = 0;
for (int y = 0; y < img.Height; ++y)
{
for (int x = 0; x < img.Width; ++x)
{
Color c = img.GetPixel(x, y);
datastream[pixpos++] = c.R;
datastream[pixpos++] = c.G;
datastream[pixpos++] = c.B;
datastream[pixpos++] = 255;
datastream[pixpos++] = bumpdata[bumppos++];
}
}
}
else
{
throw new J2cEncodingFailedException();
}
IntPtr nativePtr = J2cEncode(datastream, img.Width, img.Height, channels, lossless);
if (nativePtr == IntPtr.Zero)
{
throw new J2cEncodingFailedException();
}
byte[] j2cstream;
try
{
j2cstream = new byte[J2cEncodedGetLength(nativePtr)];
if (j2cstream.Length != J2cEncodedRead(nativePtr, j2cstream, j2cstream.Length))
{
throw new J2cEncodingFailedException();
}
}
finally
{
J2cEncodedFree(nativePtr);
}
return(j2cstream);
}
