/// <summary>
/// Saves the graphics using the specified save action.
/// </summary>
/// <example>
/// graphics.Save(image => image.SaveAsJpeg("file.jpg"))
/// </example>
public static void Save(this Graphics graphics,
Action <Image <Rgba32> > onSave)
{
var targetFormat = PixelFormat.Format_ABGR8888;
var size = graphics.OutputSize;
var pixelData = new ColorRGB888[graphics.PixelCount];
graphics.ReadPixels(ref pixelData);
var pixelHandle = GCHandle.Alloc(pixelData, GCHandleType.Pinned);
try
{
var image = new Image <Rgba32>(size.Width, size.Height);
unsafe
{
fixed(void *target = &MemoryMarshal.GetReference(image.GetPixelSpan()))
{
Pixels.Convert(size.Width, size.Height,
4 * size.Width, 4 * size.Width,
PixelFormat.Format_RGB888,
targetFormat,
pixelHandle.AddrOfPinnedObject(),
(IntPtr)target);
}
}
onSave(image);
image.Dispose();
}
finally
{
pixelHandle.Free();
}
}
public void ShouldConvertPixels()
{
var width = 10;
var height = 10;
var count = width * height;
var stride = width * 4; // 4 bytes per pixel
var before = Enumerable.Repeat <ColorRGBA8888>(
new ColorRGBA8888(Color.FromArgb(unchecked ((int)0xDEADBEEF))),
count
).ToArray();
var after = new ColorARGB8888[count];
Pixels.Convert(width, height, stride, stride, ref before, ref after);
ShouldBeEquivalent(before, after);
}