private void Update(EvaluationContext context)
{
var image = InputImage.GetValue(context);
var imageSrv = InputImageSrv.GetValue(context);
if (image == null)
{
Log.Debug("input not completet");
return;
}
var d3DDevice = ResourceManager.Instance().Device;
var immediateContext = d3DDevice.ImmediateContext;
if (_imageWithCPUAccess == null ||
_imageWithCPUAccess.Description.Format != image.Description.Format ||
_imageWithCPUAccess.Description.Width != image.Description.Width ||
_imageWithCPUAccess.Description.Height != image.Description.Height ||
_imageWithCPUAccess.Description.MipLevels != image.Description.MipLevels)
{
var desc = new Texture2DDescription()
{
BindFlags = BindFlags.None,
Format = image.Description.Format,
Width = image.Description.Width,
Height = image.Description.Height,
MipLevels = image.Description.MipLevels,
SampleDescription = new SampleDescription(1, 0),
Usage = ResourceUsage.Staging,
OptionFlags = ResourceOptionFlags.None,
CpuAccessFlags = CpuAccessFlags.Read,
ArraySize = 1
};
Utilities.Dispose(ref _imageWithCPUAccess);
_imageWithCPUAccess = new Texture2D(d3DDevice, desc);
}
if (_distanceFieldImage == null ||
_distanceFieldImage.Description.Format != image.Description.Format ||
_distanceFieldImage.Description.Width != image.Description.Width ||
_distanceFieldImage.Description.Height != image.Description.Height ||
_distanceFieldImage.Description.MipLevels != image.Description.MipLevels)
{
var desc = new Texture2DDescription()
{
BindFlags = BindFlags.ShaderResource,
Format = image.Description.Format,
Width = image.Description.Width,
Height = image.Description.Height,
MipLevels = 1,
SampleDescription = new SampleDescription(1, 0),
Usage = ResourceUsage.Dynamic,
OptionFlags = ResourceOptionFlags.None,
CpuAccessFlags = CpuAccessFlags.Write,
ArraySize = 1
};
Utilities.Dispose(ref _distanceFieldImage);
_distanceFieldImage = new Texture2D(d3DDevice, desc);
}
// if (Changed)
{
immediateContext.CopyResource(image, _imageWithCPUAccess);
int width = image.Description.Width;
int height = image.Description.Height;
if (_data == null || _data.Length != width * height)
{
_data = new float[width * height];
_xDist = new short[width * height];
_yDist = new short[width * height];
_gradients = new SharpDX.Vector2[width * height];
}
DataStream sourceStream;
var sourceDataBox =
immediateContext.MapSubresource(_imageWithCPUAccess, 0, 0, MapMode.Read, SharpDX.Direct3D11.MapFlags.None, out sourceStream);
// Convert img into float (data)
using (sourceStream)
{
sourceStream.Position = 0;
float minValue = 255, maxValue = -255;
for (int y = 0; y < height; ++y)
{
for (int x = 0; x < width; ++x)
{
var color = new Color4(sourceStream.Read <Int32>());
float v = color.Red;
_data[y * width + x] = v;
if (v > maxValue)
{
maxValue = v;
}
if (v < minValue)
{
minValue = v;
}
}
sourceStream.Position += sourceDataBox.RowPitch - width * 4;
}
// Rescale image levels between 0 and 1
for (int i = 0; i < width * height; ++i)
{
_data[i] = (_data[i] - minValue) / maxValue;
}
// transform background (black pixels)
ComputeGradient(_data, width, height);
var outside = Edtaa3(_data, height, width);
// transform forground (white pixels)
for (int i = 0; i < width * height; ++i)
{
_data[i] = 1 - _data[i]; // invert input
}
ComputeGradient(_data, width, height);
var inside = Edtaa3(_data, height, width);
// write resulting distance field to target texture
DataStream destinationStream;
var destinationDataBox = immediateContext.MapSubresource(_distanceFieldImage, 0, 0, MapMode.WriteDiscard,
SharpDX.Direct3D11.MapFlags.None, out destinationStream);
using (destinationStream)
{
sourceStream.Position = 0;
destinationStream.Position = 0;
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
int i = y * width + x;
// distmap = outside - inside; % Bipolar distance field
var color = new Color4(sourceStream.Read <Int32>());
outside[i] = MathUtils.Clamp(128.0f + (outside[i] - inside[i]) * 16.0f, 0.0f, 255.0f);
//color.Alpha = (255 - (byte) outside[i])/255.0f;
float f = (255 - (byte)outside[i]) / 255.0f;
color.Red = f;
color.Blue = f;
color.Green = f;
float alpha = 1 - _data[i];
{
// do alpha dilatation
const int range = 1;
int xs = Math.Max(x - range, 0);
int xe = Math.Min(x + range, width - 1);
int ys = Math.Max(y - range, 0);
int ye = Math.Min(y + range, height - 1);
for (int yy = ys; yy <= ye; yy++)
{
for (int xx = xs; xx <= xe; xx++)
{
alpha = Math.Max(alpha, 1 - _data[yy * width + xx]);
}
}
}
color.Alpha = alpha;// * 0.8f; // > 0.0f ? 0.5f : 0;
destinationStream.Write(color.ToRgba());
}
destinationStream.Position += destinationDataBox.RowPitch - width * 4;
}
immediateContext.UnmapSubresource(_distanceFieldImage, 0);
}
immediateContext.UnmapSubresource(_imageWithCPUAccess, 0);
}
// Changed = false;
}
Output.Value = _distanceFieldImage;
}