static void GenerateMSDF3(FloatRGBBmp output, Shape shape, double range, Vector2 scale, Vector2 translate, double edgeThreshold, EdgeBmpLut lut)
{
//----------------------
//this is our extension,
//we use lookup bitmap (lut) to check
//what is the nearest contour of a given pixel.
//----------------------
int w = output.Width;
int h = output.Height;
EdgeSegment[] singleSegment = new EdgeSegment[1];//temp array for
for (int y = 0; y < h; ++y)
{
for (int x = 0; x < w; ++x)
{
//PER-PIXEL-OPERATION
//check preview pixel
int lutPix = lut.GetPixel(x, y);
int lutPixR = (lutPix & 0xFF);
int lutPixG = (lutPix >> 8) & 0xff;
int lutPixB = (lutPix >> 16) & 0xff;
if (lutPixG == 0)
{
continue; //black=> completely outside, skip
}
if (lutPixG == EdgeBmpLut.AREA_INSIDE_COVERAGE100 ||
lutPixG == EdgeBmpLut.AREA_INSIDE_COVERAGE50 ||
lutPixG == EdgeBmpLut.AREA_INSIDE_COVERAGEX)
{
//inside the contour => fill all with white
output.SetPixel(x, y, new FloatRGB(1f, 1f, 1f));
continue;
}
//reset variables
EdgePoint r = new EdgePoint {
minDistance = SignedDistance.INFINITE
},
g = new EdgePoint {
minDistance = SignedDistance.INFINITE
},
b = new EdgePoint {
minDistance = SignedDistance.INFINITE
};
bool useR, useG, useB;
useR = useG = useB = true;
//------
Vector2 p = (new Vector2(x + .5, y + .5) / scale) - translate;
EdgeStructure edgeStructure = lut.GetEdgeStructure(x, y);
#if DEBUG
if (edgeStructure.IsEmpty)
{
//should not occurs
throw new NotSupportedException();
}
#endif
EdgeSegment[] edges = null;
if (edgeStructure.HasOverlappedSegments)
{
edges = edgeStructure.Segments;
}
else
{
singleSegment[0] = edgeStructure.Segment;
edges = singleSegment;
}
//-------------
for (int i = 0; i < edges.Length; ++i)
{
EdgeSegment edge = edges[i];
SignedDistance distance = edge.signedDistance(p, out double param);//***
if (edge.HasComponent(EdgeColor.RED) && distance < r.minDistance)
{
r.minDistance = distance;
r.nearEdge = edge;
r.nearParam = param;
useR = false;
}
if (edge.HasComponent(EdgeColor.GREEN) && distance < g.minDistance)
{
g.minDistance = distance;
g.nearEdge = edge;
g.nearParam = param;
useG = false;
}
if (edge.HasComponent(EdgeColor.BLUE) && distance < b.minDistance)
{
b.minDistance = distance;
b.nearEdge = edge;
b.nearParam = param;
useB = false;
}
}
double contour_r = r.CalculateContourColor(p);
double contour_g = g.CalculateContourColor(p);
double contour_b = b.CalculateContourColor(p);
if (useB && contour_b <= SignedDistance.INFINITE.distance)
{
contour_b = 1 * range;
}
if (useG && contour_g <= SignedDistance.INFINITE.distance)
{
contour_g = 1 * range;
}
if (useR && contour_r <= SignedDistance.INFINITE.distance)
{
contour_r = 1 * range;
}
output.SetPixel(x, y,
new FloatRGB(
(float)(contour_r / range + .5),
(float)(contour_g / range + .5),
(float)(contour_b / range + .5)
));
}
}
}
