public static void generateMSDF(FloatRGBBmp output, Shape shape, double range, Vector2 scale, Vector2 translate, double edgeThreshold)
{
List <Contour> contours = shape.contours;
int contourCount = contours.Count;
int w = output.Width;
int h = output.Height;
List <int> windings = new List <int>(contourCount);
for (int i = 0; i < contourCount; ++i)
{
windings.Add(contours[i].winding());
}
var contourSD = new MultiDistance[contourCount];
for (int y = 0; y < h; ++y)
{
int row = shape.InverseYAxis ? h - y - 1 : y;
for (int x = 0; x < w; ++x)
{
Vector2 p = (new Vector2(x + .5, y + .5) / scale) - translate;
EdgePoint sr = new EdgePoint {
minDistance = SignedDistance.INFINITE
},
sg = new EdgePoint {
minDistance = SignedDistance.INFINITE
},
sb = new EdgePoint {
minDistance = SignedDistance.INFINITE
};
double d = Math.Abs(SignedDistance.INFINITE.distance);
double negDist = -Math.Abs(SignedDistance.INFINITE.distance);
double posDist = Math.Abs(SignedDistance.INFINITE.distance);
int winding = 0;
for (int n = 0; n < contourCount; ++n)
{
//for-each contour
Contour contour = contours[n];
List <EdgeSegment> edges = contour.edges;
int edgeCount = edges.Count;
EdgePoint r = new EdgePoint {
minDistance = SignedDistance.INFINITE
},
g = new EdgePoint {
minDistance = SignedDistance.INFINITE
},
b = new EdgePoint {
minDistance = SignedDistance.INFINITE
};
for (int ee = 0; ee < edgeCount; ++ee)
{
EdgeSegment edge = edges[ee];
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;
}
if (edge.HasComponent(EdgeColor.GREEN) && distance < g.minDistance)
{
g.minDistance = distance;
g.nearEdge = edge;
g.nearParam = param;
}
if (edge.HasComponent(EdgeColor.BLUE) && distance < b.minDistance)
{
b.minDistance = distance;
b.nearEdge = edge;
b.nearParam = param;
}
}
//----------------
if (r.minDistance < sr.minDistance)
{
sr = r;
}
if (g.minDistance < sg.minDistance)
{
sg = g;
}
if (b.minDistance < sb.minDistance)
{
sb = b;
}
//----------------
double medMinDistance = Math.Abs(median(r.minDistance.distance, g.minDistance.distance, b.minDistance.distance));
if (medMinDistance < d)
{
d = medMinDistance;
winding = -windings[n];
}
if (r.nearEdge != null)
{
r.nearEdge.distanceToPseudoDistance(ref r.minDistance, p, r.nearParam);
}
if (g.nearEdge != null)
{
g.nearEdge.distanceToPseudoDistance(ref g.minDistance, p, g.nearParam);
}
if (b.nearEdge != null)
{
b.nearEdge.distanceToPseudoDistance(ref b.minDistance, p, b.nearParam);
}
//--------------
medMinDistance = median(r.minDistance.distance, g.minDistance.distance, b.minDistance.distance);
contourSD[n].r = r.minDistance.distance;
contourSD[n].g = g.minDistance.distance;
contourSD[n].b = b.minDistance.distance;
contourSD[n].med = medMinDistance;
if (windings[n] > 0 && medMinDistance >= 0 && Math.Abs(medMinDistance) < Math.Abs(posDist))
{
posDist = medMinDistance;
}
if (windings[n] < 0 && medMinDistance <= 0 && Math.Abs(medMinDistance) < Math.Abs(negDist))
{
negDist = medMinDistance;
}
}
if (sr.nearEdge != null)
{
sr.nearEdge.distanceToPseudoDistance(ref sr.minDistance, p, sr.nearParam);
}
if (sg.nearEdge != null)
{
sg.nearEdge.distanceToPseudoDistance(ref sg.minDistance, p, sg.nearParam);
}
if (sb.nearEdge != null)
{
sb.nearEdge.distanceToPseudoDistance(ref sb.minDistance, p, sb.nearParam);
}
MultiDistance msd;
msd.r = msd.g = msd.b = msd.med = SignedDistance.INFINITE.distance;
if (posDist >= 0 && Math.Abs(posDist) <= Math.Abs(negDist))
{
msd.med = SignedDistance.INFINITE.distance;
winding = 1;
for (int i = 0; i < contourCount; ++i)
{
if (windings[i] > 0 && contourSD[i].med > msd.med && Math.Abs(contourSD[i].med) < Math.Abs(negDist))
{
msd = contourSD[i];
}
}
}
else if (negDist <= 0 && Math.Abs(negDist) <= Math.Abs(posDist))
{
msd.med = -SignedDistance.INFINITE.distance;
winding = -1;
for (int i = 0; i < contourCount; ++i)
{
if (windings[i] < 0 && contourSD[i].med < msd.med && Math.Abs(contourSD[i].med) < Math.Abs(posDist))
{
msd = contourSD[i];
}
}
}
for (int i = 0; i < contourCount; ++i)
{
if (windings[i] != winding && Math.Abs(contourSD[i].med) < Math.Abs(msd.med))
{
msd = contourSD[i];
}
}
if (median(sr.minDistance.distance, sg.minDistance.distance, sb.minDistance.distance) == msd.med)
{
msd.r = sr.minDistance.distance;
msd.g = sg.minDistance.distance;
msd.b = sb.minDistance.distance;
}
output.SetPixel(x, row,
new FloatRGB(
(float)(msd.r / range + .5),
(float)(msd.g / range + .5),
(float)(msd.b / range + .5)
));
}
}
if (edgeThreshold > 0)
{
msdfErrorCorrection(output, edgeThreshold / (scale * range));
}
}
public static void generateMSDF_legacy(FloatRGBBmp output, Shape shape, double range, Vector2 scale, Vector2 translate,
double edgeThreshold)
{
int w = output.Width;
int h = output.Height;
//#ifdef MSDFGEN_USE_OPENMP
// #pragma omp parallel for
//#endif
for (int y = 0; y < h; ++y)
{
int row = shape.InverseYAxis ? h - y - 1 : y;
for (int x = 0; x < w; ++x)
{
Vector2 p = (new Vector2(x + .5, y + .5) / scale) - translate;
EdgePoint r = new EdgePoint {
minDistance = SignedDistance.INFINITE
},
g = new EdgePoint {
minDistance = SignedDistance.INFINITE
},
b = new EdgePoint {
minDistance = SignedDistance.INFINITE
};
//r.nearEdge = g.nearEdge = b.nearEdge = null;
//r.nearParam = g.nearParam = b.nearParam = 0;
List <Contour> contours = shape.contours;
int m = contours.Count;
for (int n = 0; n < m; ++n)
{
Contour contour = contours[n];
List <EdgeSegment> edges = contour.edges;
int j = edges.Count;
for (int i = 0; i < j; ++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;
}
if (edge.HasComponent(EdgeColor.GREEN) && distance < g.minDistance)
{
g.minDistance = distance;
g.nearEdge = edge;
g.nearParam = param;
}
if (edge.HasComponent(EdgeColor.BLUE) && distance < b.minDistance)
{
b.minDistance = distance;
b.nearEdge = edge;
b.nearParam = param;
}
}
if (r.nearEdge != null)
{
r.nearEdge.distanceToPseudoDistance(ref r.minDistance, p, r.nearParam);
}
if (g.nearEdge != null)
{
g.nearEdge.distanceToPseudoDistance(ref g.minDistance, p, g.nearParam);
}
if (b.nearEdge != null)
{
b.nearEdge.distanceToPseudoDistance(ref b.minDistance, p, b.nearParam);
}
output.SetPixel(x, row,
new FloatRGB(
(float)(r.minDistance.distance / range + .5),
(float)(g.minDistance.distance / range + .5),
(float)(b.minDistance.distance / range + .5)
));
}
}
}
if (edgeThreshold > 0)
{
msdfErrorCorrection(output, edgeThreshold / (scale * range));
}
}
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)
));
}
}
}