public static Image FromBitmap(Bitmap bitmap)
{
if (bitmap == null)
{
throw new ArgumentNullException(nameof(bitmap));
}
var width = bitmap.Width;
var height = bitmap.Height;
var format = bitmap.PixelFormat;
int channels;
var byteAllocated = 0;
ColorSpace colorSpace;
switch (format)
{
case PixelFormat.Format24bppRgb:
channels = 3;
colorSpace = ColorSpace.Srgb;
byteAllocated = 1;
break;
case PixelFormat.Format32bppArgb:
channels = 4;
colorSpace = ColorSpace.Srgb;
byteAllocated = 1;
break;
case PixelFormat.Format8bppIndexed:
channels = 1;
colorSpace = ColorSpace.Gray;
byteAllocated = 1;
break;
default:
throw new NotSupportedException();
}
var precision = 24u / (uint)channels;
BitmapData bitmapData = null;
try
{
bitmapData = bitmap.LockBits(new Rectangle(0, 0, width, height), ImageLockMode.ReadOnly, format);
var stride = bitmapData.Stride;
var gap = stride - width * channels;
var scan0 = bitmapData.Scan0;
using (var compressionParameters = new CompressionParameters())
{
OpenJpeg.SetDefaultEncoderParameters(compressionParameters);
var subsamplingDx = compressionParameters.SubsamplingDx;
var subsamplingDy = compressionParameters.SubsamplingDy;
var componentParametersArray = new ImageComponentParameters[channels];
for (var i = 0; i < channels; i++)
{
componentParametersArray[i] = new ImageComponentParameters
{
Precision = precision,
Bpp = precision,
Signed = false,
Dx = (uint)subsamplingDx,
Dy = (uint)subsamplingDy,
Width = (uint)width,
Height = (uint)height
};
}
var image = OpenJpeg.ImageCreate((uint)channels, componentParametersArray, colorSpace);
if (image == null)
{
return(null);
}
image.X0 = (uint)compressionParameters.ImageOffsetX0;
image.Y0 = (uint)compressionParameters.ImageOffsetY0;
image.X1 = image.X0 == 0 ? (uint)(width - 1) * (uint)subsamplingDx + 1 : image.X0 + (uint)(width - 1) * (uint)subsamplingDx + 1;
image.Y1 = image.Y0 == 0 ? (uint)(height - 1) * (uint)subsamplingDy + 1 : image.Y0 + (uint)(height - 1) * (uint)subsamplingDy + 1;
unsafe
{
// Bitmap data is interleave.
// Convert it to planer
if (byteAllocated == 1)
{
for (var i = 0; i < channels; i++)
{
// need to fix the colorspace
IntPtr target;
if (channels >= 3)
{
if (i == 0)
{
target = image.Components[2].Data; // B-R
}
else if (i == 1)
{
target = image.Components[1].Data; // G-G
}
else if (i == 2)
{
target = image.Components[0].Data; // R-B
}
else
{
target = image.Components[i].Data;
}
}
else
{
target = image.Components[i].Data;
}
var pTarget = (int *)target;
var source = (byte *)scan0;
source += i;
for (var y = 0; y < height; y++)
{
for (var x = 0; x < width; x++)
{
*pTarget = *source;
pTarget++;
source += channels;
}
source += gap;
}
}
}
}
return(image);
}
}
finally
{
if (bitmapData != null)
{
bitmap.UnlockBits(bitmapData);
}
}
}
public static Image FromRaw(byte[] raw, int width, int height, int stride, int channels, bool interleaved)
{
if (raw == null)
{
throw new ArgumentNullException(nameof(raw));
}
var byteAllocated = 1;
var colorSpace = ColorSpace.Srgb;
var precision = 24u / (uint)channels;
var gap = stride - width * channels;
using (var compressionParameters = new CompressionParameters())
{
OpenJpeg.SetDefaultEncoderParameters(compressionParameters);
var subsamplingDx = compressionParameters.SubsamplingDx;
var subsamplingDy = compressionParameters.SubsamplingDy;
var componentParametersArray = new ImageComponentParameters[channels];
for (var i = 0; i < channels; i++)
{
componentParametersArray[i] = new ImageComponentParameters
{
Precision = precision,
Bpp = precision,
Signed = false,
Dx = (uint)subsamplingDx,
Dy = (uint)subsamplingDy,
Width = (uint)width,
Height = (uint)height
};
}
var image = OpenJpeg.ImageCreate((uint)channels, componentParametersArray, colorSpace);
if (image == null)
{
return(null);
}
image.X0 = (uint)compressionParameters.ImageOffsetX0;
image.Y0 = (uint)compressionParameters.ImageOffsetY0;
image.X1 = image.X0 == 0 ? (uint)(width - 1) * (uint)subsamplingDx + 1 : image.X0 + (uint)(width - 1) * (uint)subsamplingDx + 1;
image.Y1 = image.Y0 == 0 ? (uint)(height - 1) * (uint)subsamplingDy + 1 : image.Y0 + (uint)(height - 1) * (uint)subsamplingDy + 1;
unsafe
{
fixed(byte *pRaw = &raw[0])
{
// Bitmap data is interleave.
// Convert it to planer
if (byteAllocated == 1)
{
if (interleaved)
{
for (var i = 0; i < channels; i++)
{
var target = image.Components[i].Data;
var pTarget = (int *)target;
var source = pRaw + i;
for (var y = 0; y < height; y++)
{
for (var x = 0; x < width; x++)
{
*pTarget = *source;
pTarget++;
source += channels;
}
source += gap;
}
}
}
else
{
for (var i = 0; i < channels; i++)
{
var target = image.Components[i].Data;
var pTarget = (int *)target;
var source = pRaw + i * (stride * height);
for (var y = 0; y < height; y++)
{
for (var x = 0; x < width; x++)
{
*pTarget = *source;
pTarget++;
source++;
}
source += gap;
}
}
}
}
}
}
return(image);
}
}
