public static void CopyPixels(this BitmapSource source, ColorRGBA[,] pixels, int stride, int offset)
{
var height = source.PixelHeight;
var width = source.PixelWidth;
var pixelBytes = new byte[height * width * 4];
source.CopyPixels(pixelBytes, stride, 0);
int y0 = offset / width;
int x0 = offset - width * y0;
for (int y = 0; y < height; y++)
for (int x = 0; x < width; x++)
pixels[x + x0, y + y0] = new ColorRGBA
{
Blue = pixelBytes[(y * width + x) * 4 + 0],
Green = pixelBytes[(y * width + x) * 4 + 1],
Red = pixelBytes[(y * width + x) * 4 + 2],
Alpha = pixelBytes[(y * width + x) * 4 + 3],
};
}
public static ColorRGBA[,] GetPixels(BitmapSource source)
{
int height = source.PixelHeight;
int width = source.PixelWidth;
ColorRGBA[,] result = new ColorRGBA[width, height];
int nStride = (source.PixelWidth * source.Format.BitsPerPixel + 7) / 8;
byte[] pixelByteArray = new byte[source.PixelHeight * nStride];
source.CopyPixels(pixelByteArray, nStride, 0);
ColorRGBA[] pixelColors = GetPixels(pixelByteArray, source.Format).ToArray();
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
int index = y*width + x;
result[x, y] = pixelColors[index];
}
}
//BitmapUtils.CopyPixels(source, result, width * 4, 0);
return result;
}
// http://stackoverflow.com/a/147426/25216
private static ColorRGBA FromHSLA(double H, double S, double L, double A)
{
double v;
double r, g, b;
if (A > 1.0)
A = 1.0;
r = L; // default to gray
g = L;
b = L;
v = (L <= 0.5) ? (L * (1.0 + S)) : (L + S - L * S);
if (v > 0)
{
double m;
double sv;
int sextant;
double fract, vsf, mid1, mid2;
m = L + L - v;
sv = (v - m) / v;
H *= 6.0;
sextant = (int)H;
fract = H - sextant;
vsf = v * sv * fract;
mid1 = m + vsf;
mid2 = v - vsf;
switch (sextant)
{
case 0:
r = v;
g = mid1;
b = m;
break;
case 1:
r = mid2;
g = v;
b = m;
break;
case 2:
r = m;
g = v;
b = mid1;
break;
case 3:
r = m;
g = mid2;
b = v;
break;
case 4:
r = mid1;
g = m;
b = v;
break;
case 5:
r = v;
g = m;
b = mid2;
break;
}
}
ColorRGBA rgb = new ColorRGBA();
rgb.Red = Convert.ToByte(r * 255.0f);
rgb.Green = Convert.ToByte(g * 255.0f);
rgb.Blue = Convert.ToByte(b * 255.0f);
rgb.Alpha = Convert.ToByte(A * 255.0f);
return rgb;
}
public static void PutPixels(WriteableBitmap bitmap, ColorRGBA[,] pixels)
{
int width = pixels.GetLength(0);
int height = pixels.GetLength(1);
byte[] bytes = new byte[pixels.Length*4];
for(int y = 0; y < height; ++y)
{
for(int x = 0; x < width; x+=1)
{
var index = (y * width + x)*4;
bytes[index] = pixels[x, y].Blue;
bytes[index+1] = pixels[x,y].Green;
bytes[index+2] = pixels[x,y].Red;
bytes[index + 3] = pixels[x, y].Alpha;
}
}
Int32Rect rect = new Int32Rect(0, 0, bitmap.PixelWidth, bitmap.PixelHeight);
bitmap.WritePixels(rect, bytes, width * 4, 0, 0);
}
public static ColorHSL FromRGBA(ColorRGBA colorRGBA)
{
System.Drawing.Color color = System.Drawing.Color.FromArgb(colorRGBA.Alpha, colorRGBA.Red, colorRGBA.Green, colorRGBA.Red);
return FromSystemDrawingColor(color);
}