/// <summary>
/// Clone the unmanaged images.
/// </summary>
///
/// <returns>Returns clone of the unmanaged image.</returns>
///
/// <remarks><para>The method does complete cloning of the object.</para></remarks>
///
public UnmanagedImage Clone()
{
// allocate memory for the image
var newImageData = System.Runtime.InteropServices.Marshal.AllocHGlobal(_stride * _height);
System.GC.AddMemoryPressure(_stride * _height);
var newImage = new UnmanagedImage(newImageData, _width, _height, _stride, _pixelFormat)
{
_mustBeDisposed = true
};
SystemTools.CopyUnmanagedMemory(newImageData, _imageData, _stride * _height);
return(newImage);
}
/// <summary>
/// Clone image.
/// </summary>
///
/// <param name="sourceData">Source image data.</param>
///
/// <returns>Clones image from source image data. The message does not clone pallete in the
/// case if the source image has indexed pixel format.</returns>
///
public static Bitmap Clone(BitmapData sourceData)
{
// get source image size
var width = sourceData.Width;
var height = sourceData.Height;
// create new image
var destination = new Bitmap(width, height, sourceData.PixelFormat);
// lock destination bitmap data
var destinationData = destination.LockBits(
new Rectangle(0, 0, width, height),
ImageLockMode.ReadWrite, destination.PixelFormat);
SystemTools.CopyUnmanagedMemory(destinationData.Scan0, sourceData.Scan0, height * sourceData.Stride);
// unlock destination image
destination.UnlockBits(destinationData);
return(destination);
}
/// <summary>
/// Create managed image from the unmanaged.
/// </summary>
///
/// <param name="makeCopy">Make a copy of the unmanaged image or not.</param>
///
/// <returns>Returns managed copy of the unmanaged image.</returns>
///
/// <remarks><para>If the <paramref name="makeCopy"/> is set to <see langword="true"/>, then the method
/// creates a managed copy of the unmanaged image, so the managed image stays valid even when the unmanaged
/// image gets disposed. However, setting this parameter to <see langword="false"/> creates a managed image which is
/// just a wrapper around the unmanaged image. So if unmanaged image is disposed, the
/// managed image becomes no longer valid and accessing it will generate an exception.</para></remarks>
///
/// <exception cref="InvalidImagePropertiesException">The unmanaged image has some invalid properties, which results
/// in failure of converting it to managed image. This may happen if user used the
/// <see cref="UnmanagedImage(IntPtr, int, int, int, PixelFormat)"/> constructor specifying some
/// invalid parameters.</exception>
///
public Bitmap ToManagedImage(bool makeCopy)
{
Bitmap dstImage = null;
try
{
if (!makeCopy)
{
dstImage = new Bitmap(_width, _height, _stride, _pixelFormat, _imageData);
if (_pixelFormat == PixelFormat.Format8bppIndexed)
{
Image.SetGrayscalePalette(dstImage);
}
}
else
{
// create new image of required format
dstImage = (_pixelFormat == PixelFormat.Format8bppIndexed) ?
Image.CreateGrayscaleImage(_width, _height) :
new Bitmap(_width, _height, _pixelFormat);
// lock destination bitmap data
var dstData = dstImage.LockBits(
new Rectangle(0, 0, _width, _height),
ImageLockMode.ReadWrite, _pixelFormat);
var dstStride = dstData.Stride;
var lineSize = Math.Min(_stride, dstStride);
unsafe
{
var dst = (byte *)dstData.Scan0.ToPointer();
var src = (byte *)_imageData.ToPointer();
if (_stride != dstStride)
{
// copy image
for (var y = 0; y < _height; y++)
{
SystemTools.CopyUnmanagedMemory(dst, src, lineSize);
dst += dstStride;
src += _stride;
}
}
else
{
SystemTools.CopyUnmanagedMemory(dst, src, _stride * _height);
}
}
// unlock destination images
dstImage.UnlockBits(dstData);
}
return(dstImage);
}
catch (Exception)
{
if (dstImage != null)
{
dstImage.Dispose();
}
throw new InvalidImagePropertiesException("The unmanaged image has some invalid properties, which results in failure of converting it to managed image.");
}
}
/// <summary>
/// Allocate new image in unmanaged memory.
/// </summary>
///
/// <param name="width">Image width.</param>
/// <param name="height">Image height.</param>
/// <param name="pixelFormat">Image pixel format.</param>
///
/// <returns>Return image allocated in unmanaged memory.</returns>
///
/// <remarks><para>Allocate new image with specified attributes in unmanaged memory.</para>
///
/// <para><note>The method supports only
/// <see cref="System.Drawing.Imaging.PixelFormat">Format8bppIndexed</see>,
/// <see cref="System.Drawing.Imaging.PixelFormat">Format16bppGrayScale</see>,
/// <see cref="System.Drawing.Imaging.PixelFormat">Format24bppRgb</see>,
/// <see cref="System.Drawing.Imaging.PixelFormat">Format32bppRgb</see>,
/// <see cref="System.Drawing.Imaging.PixelFormat">Format32bppArgb</see>,
/// <see cref="System.Drawing.Imaging.PixelFormat">Format32bppPArgb</see>,
/// <see cref="System.Drawing.Imaging.PixelFormat">Format48bppRgb</see>,
/// <see cref="System.Drawing.Imaging.PixelFormat">Format64bppArgb</see> and
/// <see cref="System.Drawing.Imaging.PixelFormat">Format64bppPArgb</see> pixel formats.
/// In the case if <see cref="System.Drawing.Imaging.PixelFormat">Format8bppIndexed</see>
/// format is specified, pallete is not not created for the image (supposed that it is
/// 8 bpp grayscale image).
/// </note></para>
/// </remarks>
///
/// <exception cref="UnsupportedImageFormatException">Unsupported pixel format was specified.</exception>
/// <exception cref="InvalidImagePropertiesException">Invalid image size was specified.</exception>
///
public static UnmanagedImage Create(int width, int height, PixelFormat pixelFormat)
{
var bytesPerPixel = 0;
// calculate bytes per pixel
switch (pixelFormat)
{
case PixelFormat.Format8bppIndexed:
bytesPerPixel = 1;
break;
case PixelFormat.Format16bppGrayScale:
bytesPerPixel = 2;
break;
case PixelFormat.Format24bppRgb:
bytesPerPixel = 3;
break;
case PixelFormat.Format32bppRgb:
case PixelFormat.Format32bppArgb:
case PixelFormat.Format32bppPArgb:
bytesPerPixel = 4;
break;
case PixelFormat.Format48bppRgb:
bytesPerPixel = 6;
break;
case PixelFormat.Format64bppArgb:
case PixelFormat.Format64bppPArgb:
bytesPerPixel = 8;
break;
default:
throw new UnsupportedImageFormatException("Can not create image with specified pixel format.");
}
// check image size
if ((width <= 0) || (height <= 0))
{
throw new InvalidImagePropertiesException("Invalid image size specified.");
}
// calculate stride
var stride = width * bytesPerPixel;
if (stride % 4 != 0)
{
stride += (4 - (stride % 4));
}
// allocate memory for the image
var imageData = System.Runtime.InteropServices.Marshal.AllocHGlobal(stride * height);
SystemTools.SetUnmanagedMemory(imageData, 0, stride * height);
System.GC.AddMemoryPressure(stride * height);
var image = new UnmanagedImage(imageData, width, height, stride, pixelFormat)
{
_mustBeDisposed = true
};
return(image);
}
