public void Test_Bgr32()
{
string[] hexValues = new[] { "FF0000", "FF00", "FF" };
for (int i = 0; i < 3; i++)
{
int x = i == 0 ? 1 : 0;
int y = i == 1 ? 1 : 0;
int z = i == 2 ? 1 : 0;
var testPixel = new Bgr32(x, y, z);
Assert.Equal($"Bgr32({z}, {y}, {x})", testPixel.ToString());
var destPixel = new ImageSharp.PixelFormats.Rgba32(0);
testPixel.ToRgba32(ref destPixel);
Assert.Equal(hexValues[i], testPixel.PackedValue.ToString("X"));
Assert.Equal(i == 0 ? 255 : 0, destPixel.R);
Assert.Equal(i == 1 ? 255 : 0, destPixel.G);
Assert.Equal(i == 2 ? 255 : 0, destPixel.B);
Assert.Equal(255, destPixel.A);
var vector4 = testPixel.ToVector4();
testPixel.FromVector4(vector4);
Assert.Equal(testPixel.ToVector4(), vector4);
}
}
/// <summary>
/// BoxBlurHorizontal is a private helper method for the BoxBlur, only for IFastBitmaps with alpha channel
/// </summary>
/// <param name="unmanagedBitmap">UnmanagedBitmap</param>
/// <param name="range">Range must be odd!</param>
private static void BoxBlurHorizontal(UnmanagedBitmap <Bgr32> unmanagedBitmap, int range)
{
var halfRange = range / 2;
Parallel.For(0, unmanagedBitmap.Height, y =>
{
unsafe {
var rgb32 = unmanagedBitmap[y];
Span <Bgr32> averages = stackalloc Bgr32[range];
var r = 0;
var g = 0;
var b = 0;
var hits = halfRange;
for (var x = 0; x < halfRange; x++)
{
ref Bgr32 color = ref rgb32[x];
r += color.R;
g += color.G;
b += color.B;
}
for (var x = 0; x < unmanagedBitmap.Width; x++)
{
var leftSide = x - halfRange - 1;
if (leftSide >= 0)
{
// Get value at the left side of range
ref Bgr32 color = ref rgb32[leftSide];
r -= color.R;
g -= color.G;
b -= color.B;
hits--;
}
var rightSide = x + halfRange;
if (rightSide < unmanagedBitmap.Width)
{
ref Bgr32 color = ref rgb32[rightSide];
r += color.R;
g += color.G;
b += color.B;
hits++;
}
ref Bgr32 average = ref averages[x % range];
average.R = (byte)(r / hits);
average.G = (byte)(g / hits);
average.B = (byte)(b / hits);
if (leftSide >= 0)
{
// Now we can write the value from the calculated avarages
var readLocation = (leftSide % range);
rgb32[leftSide] = averages[readLocation];
}
}
