/// <summary>
/// Checks parameters of <see cref="INativeBitmapSource.CopyToBitmap"/>.
/// </summary>
public static void CopyToBitmap(INativeBitmapSource source, Rectangle sourceArea, IntPtr bitmap, int stride, out int requiredBufferSize)
{
if (bitmap == IntPtr.Zero)
{
throw new NullReferenceException($"Pointer to bitmap cannot be {nameof(IntPtr.Zero)}.");
}
if (sourceArea.Left < 0 || sourceArea.Top < 0 || sourceArea.Right > source.Width || sourceArea.Bottom > source.Height)
{
throw new InvalidOperationException
(
$"Source area ({sourceArea}) does not fit within the area of this source ({new Rectangle(0, 0, source.Width, source.Height)})."
);
}
if (sourceArea.Width < 0)
{
throw new InvalidOperationException($"Width of source area ({sourceArea.Width}) cannot be negative.");
}
if (sourceArea.Height < 0)
{
throw new InvalidOperationException($"Height of source area ({sourceArea.Height}) cannot be negative.");
}
if (stride < 0)
{
throw new InvalidOperationException($"Stride ({stride}) cannot be negative.");
}
if (stride < 4L * sourceArea.Width)
{
throw new InvalidOperationException($"Stride ({stride}) is less than 4 * (width of source area ({sourceArea.Width})).");
}
if (sourceArea.Height == 0)
{
requiredBufferSize = 0;
}
else
{
long requiredBufferSizeL = (sourceArea.Height - 1L) * stride + sourceArea.Width * 4L;
if (requiredBufferSizeL > int.MaxValue)
{
throw new InvalidOperationException($"Required size of target buffer ({requiredBufferSizeL}) exceeds {int.MaxValue}.");
}
requiredBufferSize = (int)requiredBufferSizeL;
}
}
private static INativeImage CreateImage(INativeBitmapSource source)
{
byte[] pixels = new byte[4 * source.Width * source.Height];
GCHandle pixelsHandle = GCHandle.Alloc(pixels, GCHandleType.Pinned);
try
{
source.CopyToBitmap(new Rectangle(0, 0, source.Width, source.Height), pixelsHandle.AddrOfPinnedObject(), 4 * source.Width);
}
finally
{
pixelsHandle.Free();
}
return(new Win32Image(source.Width, source.Height, pixels));
}
