internal ColorRaw Compute(ColorRaw[] data)
{
float r = 0;
float g = 0;
float b = 0;
for (int i = 0; i < _filter.Length; ++i)
{
r += _filter[i] * data[i].R;
g += _filter[i] * data[i].G;
b += _filter[i] * data[i].B;
}
r = r / _factor + _offset;
g = g / _factor + _offset;
b = b / _factor + _offset;
return(ColorRaw.FromRgb(Clamp(r), Clamp(g), Clamp(b)));
}
// Helpers!
// ReSharper disable once SuggestBaseTypeForParameter
private static void ComputeEdgeDetectFilter0AtOffsetNapron(deviceptr <ColorRaw> input, deviceptr <ColorRaw> result, int resultLength, float[] mFilter, float mFactor, float mOffset, int i, int width)
{
var cx = i % width;
var cy = i / width;
var sx = cx - 1;
var sy = cy - 1;
var ex = cx + 1;
var ey = cy + 1;
var r = 0f;
var g = 0f;
var b = 0f;
var filterIndex = 0;
for (var y = sy; y <= ey; ++y)
{
for (var x = sx; x <= ex; ++x)
{
var offset = y * width + x;
var pixel = offset < resultLength
? input[offset]
: ColorRaw.FromRgb(0, 0, 0);
var currentFilter = mFilter[filterIndex++];
r += pixel.R * currentFilter;
g += pixel.G * currentFilter;
b += pixel.B * currentFilter;
}
}
r = r / mFactor + mOffset;
g = g / mFactor + mOffset;
b = b / mFactor + mOffset;
result[i] = ColorRaw.FromRgb(Clamp(r), Clamp(g), Clamp(b));
}
internal static ColorRaw[] ToColorArray(Bitmap bmp)
{
var result = new ColorRaw[bmp.Width * bmp.Height];
var temp = new byte[Marshal.SizeOf <ColorRaw>() * bmp.Width * bmp.Height];
var data = bmp.LockBits(new Rectangle(0, 0, bmp.Width, bmp.Height), ImageLockMode.ReadOnly, DefaultPixelFormat);
Marshal.Copy(data.Scan0, temp, 0, temp.Length);
bmp.UnlockBits(data);
Parallel.For(0, result.Length, i =>
{
var k = 3 * i;
result[i] = new ColorRaw
{
R = temp[k + 0],
G = temp[k + 1],
B = temp[k + 2],
};
});
return(result);
}
// Custom Array!
internal static Image Render2(Bitmap image, ConvolutionFilter filter)
{
var width = image.Width;
var height = image.Height;
var source = BitmapUtility.ToColorArray(image);
var result = new ColorRaw[width * height];
Parallel.For(0, height, y =>
{
for (var x = 0; x < width; ++x)
{
var offset = y * width + x;
var neighbours = GetNeighbours(x, y, width, height, (nx, ny, i) => (nx >= 0 && nx < width && ny >= 0 && ny < height) == false
? ColorRaw.FromRgb(0, 0, 0)
: source[i]);
result[offset] = filter.Compute(neighbours);
}
});
return(BitmapUtility.FromColorArray(result, image.Width, image.Height));
}