private unsafe void DrawRoundLine_None(Stadium stad, uint clr, uint* pxls, int w, int h)
{
// Compute the inclusive maximum bound for Y
int maxy = (int)Math.Ceiling(stad.MaxY);
if (maxy > h - 1)
{
maxy = h - 1;
}
else if (maxy < 0)
{
// We're not even on the image and don't need to draw anything
return;
}
// Fill pixels within the stadium
for (int y = (int)Math.Max(Math.Floor(stad.MinY), 0.0); y <= maxy; y++)
{
float minx, maxx;
stad.HLineIntersection((float)y, out minx, out maxx);
// If there's no intersection, then we can move to the next row
if (float.IsNaN(minx) || float.IsNaN(maxx))
{
continue;
}
// Compute the inclusive upper and lower bounds for X for this row
int x = (int)Math.Floor(minx);
if (x < 0)
{
x = 0;
}
int rowMaxX = (int)Math.Ceiling(maxx);
if (rowMaxX > w - 1)
{
rowMaxX = w - 1;
}
// Get a pointer to the row of pixels
uint* rowPtr = &pxls[y * w + x];
while (x <= rowMaxX)
{
float dist = stad.Axis.DistanceU(new Vector2D(x, y));
if (dist >= stad.Radius)
{
x++;
rowPtr++;
continue;
}
float distFromEdge = stad.Radius - dist;
if (distFromEdge < 2.0f)
{
// Soften alpha value
uint newa = (uint)((distFromEdge / 2.0f) * (float)((*rowPtr) >> 24));
*rowPtr = (clr & 0x00FFffFF) | (newa << 24);
}
else
{
*rowPtr = clr;
}
x++;
rowPtr++;
}
}
}
