internal static Avalonia.Media.Imaging.WriteableBitmap GetHB(double S)
{
Avalonia.Media.Imaging.WriteableBitmap bmp = new Avalonia.Media.Imaging.WriteableBitmap(new PixelSize(256, 256), new Vector(96, 96), Avalonia.Platform.PixelFormat.Rgba8888, Avalonia.Platform.AlphaFormat.Unpremul);
using (var fb = bmp.Lock())
{
unsafe
{
byte *rgbaValues = (byte *)fb.Address;
for (int x = 0; x < 256; x++)
{
for (int y = 0; y < 256; y++)
{
HSVToRGB(x / 255.0, S, 1 - y / 255.0,
out rgbaValues[x * 4 + y * 256 * 4],
out rgbaValues[x * 4 + y * 256 * 4 + 1],
out rgbaValues[x * 4 + y * 256 * 4 + 2]
);
rgbaValues[x * 4 + y * 256 * 4 + 3] = 255;
}
}
}
}
return(bmp);
}
public static Avalonia.Media.Imaging.WriteableBitmap GetG(byte R, byte B)
{
Avalonia.Media.Imaging.WriteableBitmap bmp = new Avalonia.Media.Imaging.WriteableBitmap(new PixelSize(1, 256), new Vector(96, 96), Avalonia.Platform.PixelFormat.Rgba8888, Avalonia.Platform.AlphaFormat.Unpremul);
using (var fb = bmp.Lock())
{
unsafe
{
byte *rgbaValues = (byte *)fb.Address;
for (int y = 0; y < 256; y++)
{
rgbaValues[y * 4] = R;
rgbaValues[y * 4 + 1] = (byte)(255 - y);
rgbaValues[y * 4 + 2] = B;
rgbaValues[y * 4 + 3] = 255;
}
}
}
return(bmp);
}
internal static Avalonia.Media.Imaging.WriteableBitmap GetHS(double B)
{
Avalonia.Media.Imaging.WriteableBitmap bmp = new Avalonia.Media.Imaging.WriteableBitmap(new PixelSize(256, 256), new Vector(96, 96), Avalonia.Platform.PixelFormat.Rgba8888, Avalonia.Platform.AlphaFormat.Unpremul);
using (var fb = bmp.Lock())
{
unsafe
{
byte *rgbaValues = (byte *)fb.Address;
for (int x = 0; x < 256; x++)
{
for (int y = 0; y < 256; y++)
{
double r = Math.Sqrt((x - 128) * (x - 128) + (y - 128) * (y - 128));
if (r <= 130)
{
double theta = Math.Atan2(y - 128, x - 128) / Math.PI;
HSVToRGB(theta * 0.5, Math.Min(1, r / 128.0), B,
out rgbaValues[x * 4 + y * 256 * 4],
out rgbaValues[x * 4 + y * 256 * 4 + 1],
out rgbaValues[x * 4 + y * 256 * 4 + 2]
);
if (r >= 126)
{
rgbaValues[x * 4 + y * 256 * 4 + 3] = (byte)Math.Max(0, Math.Min(255, 32640 - 255 * r));
}
else
{
rgbaValues[x * 4 + y * 256 * 4 + 3] = 255;
}
}
}
}
}
}
return(bmp);
}
internal static WriteableBitmap GetShiftedS(WriteableBitmap originalS, double vRadius, bool front)
{
int delta = (int)Math.Round(vRadius * 256 / 56);
int[] shifts = new int[128];
for (int i = 0; i < 128; i++)
{
double cos = (63.5 - i) / 63.5;
shifts[i] = (int)Math.Round(Math.Sqrt(1 - cos * cos) * delta);
}
Avalonia.Media.Imaging.WriteableBitmap bmp = new Avalonia.Media.Imaging.WriteableBitmap(new PixelSize(128, 256 + delta), new Vector(96, 96), Avalonia.Platform.PixelFormat.Rgba8888, Avalonia.Platform.AlphaFormat.Unpremul);
if (front)
{
using (var fb = bmp.Lock())
{
using (var fb2 = originalS.Lock())
{
unsafe
{
byte *rgbaValues = (byte *)fb.Address;
byte *rgbaValuesOrig = (byte *)fb2.Address;
for (int x = 0; x < 128; x++)
{
for (int y = shifts[x]; y < 256 + shifts[x]; y++)
{
rgbaValues[x * 4 + y * 128 * 4] = rgbaValuesOrig[(127 - x) * 4 + (y - shifts[x]) * 256 * 4];
rgbaValues[x * 4 + y * 128 * 4 + 1] = rgbaValuesOrig[(127 - x) * 4 + (y - shifts[x]) * 256 * 4 + 1];
rgbaValues[x * 4 + y * 128 * 4 + 2] = rgbaValuesOrig[(127 - x) * 4 + (y - shifts[x]) * 256 * 4 + 2];
rgbaValues[x * 4 + y * 128 * 4 + 3] = 255;
}
}
}
}
}
}
else
{
using (var fb = bmp.Lock())
{
using (var fb2 = originalS.Lock())
{
unsafe
{
byte *rgbaValues = (byte *)fb.Address;
byte *rgbaValuesOrig = (byte *)fb2.Address;
for (int x = 0; x < 128; x++)
{
for (int y = delta - shifts[x]; y < 256 + delta - shifts[x]; y++)
{
rgbaValues[x * 4 + y * 128 * 4] = rgbaValuesOrig[(128 + x) * 4 + (y - delta + shifts[x]) * 256 * 4];
rgbaValues[x * 4 + y * 128 * 4 + 1] = rgbaValuesOrig[(128 + x) * 4 + (y - delta + shifts[x]) * 256 * 4 + 1];
rgbaValues[x * 4 + y * 128 * 4 + 2] = rgbaValuesOrig[(128 + x) * 4 + (y - delta + shifts[x]) * 256 * 4 + 2];
rgbaValues[x * 4 + y * 128 * 4 + 3] = 255;
}
}
}
}
}
}
return(bmp);
}
/*
* public void Resize(PixelSize size) {
* if (size == Size) return;
* Size = size;
*
* Dispose();
*
* if (IsEmpty()) return;
*
* AvaloniaBitmap = new AI.WriteableBitmap(
* Size,
* new Vector(1, 1), // DPI scale ?
* //Avalonia.Platform.PixelFormat.Rgba8888
* Avalonia.Platform.PixelFormat.Bgra8888 // seems faster for me! // like System.Drawing.Imaging.PixelFormat.Format32bppArgb
* );
*
* for (int i = 0; i < SystemBitmaps.Length; ++i) {
* SystemBitmaps[i] = new SD.Bitmap(
* Size.Width, Size.Height,
* SD.Imaging.PixelFormat.Format32bppArgb
* );
* }
* }
*/
public bool CopyPixels(int sourceIndex) // copy pixels from SystemBitmap to AvaloniaBitmap. UI thread
{
//Debug.WriteLine("CopyPixels begin");
SD.Bitmap systemBitmap = SystemBitmaps[sourceIndex];
if (systemBitmap == null)
{
return(false);
}
if (AvaloniaBitmap == null)
{
return(false);
}
using (var buf1 = AvaloniaBitmap.Lock())
{
long length1 = buf1.Size.Height * buf1.RowBytes;
var buf0 = systemBitmap.LockBits(
new SD.Rectangle(SD.Point.Empty, systemBitmap.Size),
SD.Imaging.ImageLockMode.ReadOnly,
systemBitmap.PixelFormat
);
long length0 = buf0.Height * buf0.Stride;
if (length1 == length0)
{
// quick. just copy memory
unsafe {
System.Buffer.MemoryCopy(
buf0.Scan0.ToPointer(),
buf1.Address.ToPointer(),
length1, length0
);
}
}
else
{
// slow. copy by line. may occure on resizing
int h = Math.Min(buf0.Height, buf1.Size.Height); // in pixels
int w = Math.Min(buf0.Stride, buf1.RowBytes); // in bytes
unsafe {
for (int i = 0; i < h; ++i)
{
System.Buffer.MemoryCopy(
(buf0.Scan0 + buf0.Stride * i).ToPointer(),
(buf1.Address + buf1.RowBytes * i).ToPointer(),
w, w
);
}
}
}
systemBitmap.UnlockBits(buf0);
}
//Debug.WriteLine("CopyPixels end");
return(true);
}
