// Return tensor from bitmap
private static Tensor <float> ToTensor(Bitmap image)
{
var rect = new Rectangle(Point.Empty, image.Size);
var tensor = new DenseTensor <float>(rect.ToNHWC());
var data = image.LockBits(rect, ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
var row = new byte[data.Stride];
for (var i = 0; i < rect.Height; ++i)
{
_ = data.GetRowArgb(row, 0, i);
tensor.SetRowArgb(row, 0, i);
}
image.UnlockBits(data);
return(tensor);
}
public void TestSetRowArgbArray()
{
using (var bitmap = SurfaceExtensionsTest.LoadResource("style.png"))
{
var line = new Rectangle(13, 27, 64, 1);
var data = bitmap.LockBits(line, ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
var expected = new byte[line.Width * 4];
_ = data.GetRowArgb(expected, 0, 0);
bitmap.UnlockBits(data);
var tensor = new DenseTensor <float>(new Rectangle(Point.Empty, bitmap.Size).ToNHWC());
tensor.SetRowArgb(expected, line.X, line.Y);
var actual = new byte[expected.Length];
_ = tensor.GetRowArgb(actual, line.X, line.Y);
CollectionAssert.AreEqual(expected, actual);
}
}
public void TestSetRowArgbArraySegment()
{
using (var bitmap = SurfaceExtensionsTest.LoadResource("style.png"))
{
var line = new Rectangle(13, 27, 64, 1);
var data = bitmap.LockBits(line, ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
var expected = new byte[data.Stride + 32];
var memory = new ArraySegment <byte>(expected, 8, line.Width * 4);
_ = data.GetRowArgb(memory, 0, 0);
bitmap.UnlockBits(data);
var tensor = new DenseTensor <float>(new Rectangle(Point.Empty, bitmap.Size).ToNHWC());
tensor.SetRowArgb(memory, line.X, line.Y);
var actual = new byte[memory.Count];
_ = tensor.GetRowArgb(actual, line.X, line.Y);
CollectionAssert.AreEqual(expected.Skip(memory.Offset).Take(memory.Count).ToArray(), actual);
}
}
