public static Image <TPixelTo> LoadPixels <TPixelFrom, TPixelTo>(
ReadOnlySpan <TPixelFrom> pixels,
Rectangle sourceRectangle,
int?pixelStride = null)
where TPixelFrom : unmanaged, IPixel
where TPixelTo : unmanaged, IPixel <TPixelTo>
{
if (pixels.IsEmpty)
{
throw new ArgumentEmptyException(nameof(pixels));
}
ImagingArgumentGuard.AssertNonEmptyRectangle(sourceRectangle, nameof(sourceRectangle));
var image = new Image <TPixelTo>(sourceRectangle.Size);
try
{
LoadPixels(pixels, image, sourceRectangle, pixelStride);
}
catch
{
image.Dispose();
throw;
}
return(image);
}
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..];
// TODO: move these out of Image class
// AND ALSO make them into extenions for Image class
public static void LoadPixels <TPixelFrom, TPixelTo>(
ReadOnlySpan <TPixelFrom> pixels,
IPixelBuffer <TPixelTo> destination,
Rectangle sourceRectangle,
int?pixelStride = null)
where TPixelFrom : unmanaged, IPixel
where TPixelTo : unmanaged, IPixel <TPixelTo>
{
if (destination == null)
{
throw new ArgumentNullException(nameof(destination));
}
ImagingArgumentGuard.AssertNonEmptyRectangle(sourceRectangle, nameof(sourceRectangle));
int srcStride = pixelStride ?? sourceRectangle.Width;
for (int y = 0; y < sourceRectangle.Height; y++)
{
var srcRow = pixels.Slice(sourceRectangle.X + (sourceRectangle.Y + y) * srcStride, srcStride);
var dstRow = destination.GetPixelRow(y);
ConvertPixels(srcRow, dstRow);
}
}