/// <summary>
/// Creates a mouse cursor from the specified pixels.
/// </summary>
/// <param name="pixels">Pixels to use as the cursor image.</param>
/// <param name="origin">A point in the pixels that is used as the cursor position.</param>
/// <param name="sourceRectangle">Optional part of the image to use as the cursor.</param>
public static MouseCursor FromPixels(
IReadOnlyPixelRows pixels, Point origin, Rectangle?sourceRectangle = null)
{
if (pixels == null)
{
throw new ArgumentNullException(nameof(pixels));
}
Rectangle rect = sourceRectangle ?? pixels.GetBounds();
if (!pixels.GetBounds().Contains(rect))
{
throw new ArgumentOutOfRangeException(
nameof(sourceRectangle), "The source rectangle is outside the pixel buffer.");
}
IReadOnlyPixelMemory <Color>?pixelBuffer = null;
try
{
if (rect.Position == Point.Zero &&
pixels is IReadOnlyPixelMemory <Color> rgbaMemory &&
rgbaMemory.IsPaddedPixelContiguous())
{
pixelBuffer = rgbaMemory;
}
else
{
pixelBuffer = Image.LoadPixels <Color>(pixels.ProjectRows(x => x.Crop(rect)));
}
return(PlatformFromPixels(pixelBuffer, rect.Width, rect.Height, origin));
}
finally
{
pixelBuffer?.Dispose();
}
}
public static void LoadPixels <TPixelFrom, TPixelTo>(
IReadOnlyPixelRows pixels, IPixelBuffer <TPixelTo> destination, Rectangle?sourceRectangle = null)
where TPixelFrom : unmanaged, IPixel
where TPixelTo : unmanaged, IPixel <TPixelTo>
{
if (pixels == null)
{
throw new ArgumentNullException(nameof(pixels));
}
if (destination == null)
{
throw new ArgumentNullException(nameof(destination));
}
var rect = sourceRectangle ?? pixels.GetBounds();
ImagingArgumentGuard.AssertNonEmptyRectangle(rect, nameof(sourceRectangle));
Span <byte> rowByteBuffer = stackalloc byte[4096];
var rowBuffer = MemoryMarshal.Cast <byte, TPixelFrom>(rowByteBuffer);
for (int y = 0; y < rect.Height; y++)
{
var dstRow = destination.GetPixelRowSpan(y);
int offsetX = 0;
do
{
int left = rect.Width - offsetX;
int count = Math.Min(rowBuffer.Length, left);
var slice = rowBuffer.Slice(0, count);
pixels.GetPixelByteRow(rect.X + offsetX, rect.Y + y, MemoryMarshal.AsBytes(slice));
ConvertPixels(slice, dstRow);
dstRow = dstRow[count..];