/// <summary>
/// Blends the colors based on the given weight values.
/// </summary>
/// <param name="c">The array of color values.</param>
/// <param name="w">The array of weight values.</param>
/// <returns>
/// The weights should be fixed point numbers.
/// The total summation of the weight values will be treated as "1.0".
/// Each color will be blended in proportionally to its weight value respective to
/// the total summation of the weight values.
/// </returns>
/// <remarks>
/// "WAIP" stands for "weights, arbitrary integer precision"</remarks>
public static ColorBgra BlendColorsWAIP(ColorBgra[] c, uint[] w)
{
if (c.Length != w.Length)
{
throw new ArgumentException("c.Length != w.Length");
}
if (c.Length == 0)
{
return(ColorBgra.FromUInt32(0));
}
long wsum = 0;
long asum = 0;
for (int i = 0; i < w.Length; ++i)
{
wsum += w[i];
asum += c[i].A * w[i];
}
uint a = (uint)((asum + (wsum >> 1)) / wsum);
long b;
long g;
long r;
if (a == 0)
{
b = 0;
g = 0;
r = 0;
}
else
{
b = 0;
g = 0;
r = 0;
for (int i = 0; i < c.Length; ++i)
{
b += (long)c[i].A * c[i].B * w[i];
g += (long)c[i].A * c[i].G * w[i];
r += (long)c[i].A * c[i].R * w[i];
}
b /= asum;
g /= asum;
r /= asum;
}
return(ColorBgra.FromUInt32((uint)b + ((uint)g << 8) + ((uint)r << 16) + ((uint)a << 24)));
}
/// <summary>
/// Constructs a MaskSurface by copying the given region-of-interest from an Image.
/// </summary>
/// <param name="source">The Surface to copy pixels from.</param>
/// <param name="roi">Defines the Region from which to copy pixels from the Image.</param>
public MaskedSurface(Surface source, PdnRegion roi)
{
PdnRegion roiClipped = (PdnRegion)roi.Clone();
roiClipped.Intersect(source.Bounds);
Rectangle boundsClipped = roiClipped.GetBoundsInt();
this.surface = new Surface(boundsClipped.Size);
this.surface.Clear(ColorBgra.FromUInt32(0x00ffffff));
Rectangle rect = boundsClipped;
Point dstOffset = new Point(rect.X - boundsClipped.X, rect.Y - boundsClipped.Y);
this.surface.CopySurface(source, dstOffset, rect);
this.region = roiClipped;
// TODO: FromRegion() is a VERY expensive call for what we are doing!
PdnGraphicsPath newPath = PdnGraphicsPath.FromRegion(this.region);
SetPathField(newPath);
}
} public override ColorBgra Apply(ColorBgra lhs, ColorBgra rhs)
{
int lhsA; { lhsA = ((lhs).A); }; int rhsA; { rhsA = ApplyOpacity((rhs).A); }; int y; { y = ((lhsA) * (255 - rhsA) + 0x80); y = ((((y) >> 8) + (y)) >> 8); }; int totalA = y + rhsA; uint ret; if (totalA == 0)
{
ret = 0;
}
else
{
int fB; int fG; int fR; { fB = ((rhs).B); }; { fG = ((rhs).G); }; { fR = ((rhs).R); }; int x; { x = ((lhsA) * (rhsA) + 0x80); x = ((((x) >> 8) + (x)) >> 8); }; int z = rhsA - x; int masIndex = totalA * 3; uint taM = masTable[masIndex]; uint taA = masTable[masIndex + 1]; uint taS = masTable[masIndex + 2]; uint b = (uint)(((((long)((((lhs).B * y) + ((rhs).B * z) + (fB * x)))) * taM) + taA) >> (int)taS); uint g = (uint)(((((long)((((lhs).G * y) + ((rhs).G * z) + (fG * x)))) * taM) + taA) >> (int)taS); uint r = (uint)(((((long)((((lhs).R * y) + ((rhs).R * z) + (fR * x)))) * taM) + taA) >> (int)taS); int a; { { a = ((lhsA) * (255 - (rhsA)) + 0x80); a = ((((a) >> 8) + (a)) >> 8); }; a += (rhsA); }; ret = b + (g << 8) + (r << 16) + ((uint)a << 24);
}; return(ColorBgra.FromUInt32(ret));
}
public static ColorBgra ParseHexString(string hexString)
{
uint value = Convert.ToUInt32(hexString, 16);
return(ColorBgra.FromUInt32(value));
}
public override ColorBgra Apply(ColorBgra color)
{
return(ColorBgra.FromUInt32(color.Bgra | 0xff000000));
}
public override ColorBgra Apply(ColorBgra color)
{
return(ColorBgra.FromUInt32((color.Bgra & 0x00ffffff) + addValue));
}
