float remainingSpace; //keeps track of spacing
protected unsafe override void OnMouseMove(QueuedToolEventArgs le)
{
SmudgeEventArgs e = le as SmudgeEventArgs;
int jittermax = (int)(e.Jitter * e.BrushWidth);
Rectangle invrect = new Rectangle(lastmouse.X - brushwidth / 2, lastmouse.Y - brushheight / 2, brushwidth, brushheight);
invrect = Rectangle.Union(invrect, new Rectangle(e.X - brushwidth / 2, e.Y - brushheight / 2, brushwidth, brushheight));
invrect.Inflate(jittermax, jittermax);
if (e.Button == MouseButtons.Left && mousedown)
{
float dist = Distance(lastmouse, e.Location);
ColorBgra *ptr0 = (ColorBgra *)Surface.Scan0.VoidStar;
float f;
for (f = remainingSpace; f < dist && !IsAborted; f += spacing)
{
PointF currentpoint = Lerp(lastmouse, e.Location, f / dist);
if (jittermax > 0)
{
currentpoint.X += r.Next(-jittermax, jittermax);
currentpoint.Y += r.Next(-jittermax, jittermax);
}
Point dstpt = Point.Subtract(new Point((int)currentpoint.X, (int)currentpoint.Y), brushcenteroffset);
Rectangle dstRect = new Rectangle(dstpt, brushsize);
Rectangle clippedRect = Rectangle.Intersect(dstRect, Surface.Bounds);
fixed(float *brshpin = brush,
_strmask = strengthmask)
{
float *brshptr = brshpin,
strmask = _strmask;
int maxy = dstpt.Y + dstRect.Height;
int maxx = dstpt.X + dstRect.Width;
for (int y = dstpt.Y; y < maxy; ++y)
{
int dsty = Clamp(y, 0, srfcHeight - 1);
ColorBgra *ptrrow = ptr0 + srfcWidth * dsty;
for (int x = dstpt.X; x < maxx; ++x)
{
int dstx = Clamp(x, 0, srfcWidth - 1);
ColorBgra *srfcptr = ptrrow + dstx;
float invstr = 1.0f - *strmask;
//eliminate fringing from 0-alpha
//this officially makes us awesomer than Photoshop
if (brshptr[A] == 0.0f)
{
brshptr[B] = srfcptr->B;
brshptr[G] = srfcptr->G;
brshptr[R] = srfcptr->R;
}
else if (srfcptr->A == 0)
{
srfcptr->B = (byte)(brshptr[B]);
srfcptr->G = (byte)(brshptr[G]);
srfcptr->R = (byte)(brshptr[R]);
}
//blend the surface into the brush buffer, then copy it back onto the surface
brshptr[B] = (brshptr[B] * *strmask + srfcptr->B * invstr);
srfcptr->B = (byte)(brshptr[B] + 0.5f);
brshptr[G] = (brshptr[G] * *strmask + srfcptr->G * invstr);
srfcptr->G = (byte)(brshptr[G] + 0.5f);
brshptr[R] = (brshptr[R] * *strmask + srfcptr->R * invstr);
srfcptr->R = (byte)(brshptr[R] + 0.5f);
brshptr[A] = (brshptr[A] * *strmask + srfcptr->A * invstr);
srfcptr->A = (byte)(brshptr[A] + 0.5f);
brshptr += 4;
++strmask;
}
}
}
}
remainingSpace = f - dist;
}
OnInvalidated(invrect);
lastmouse = e.Location;
}
protected unsafe override void OnMouseDown(QueuedToolEventArgs le)
{
SmudgeEventArgs e = le as SmudgeEventArgs;
lastmouse = e.Location;
if (e.Button == MouseButtons.Left)
{
mousedown = true;
using (Surface brushsource = e.Brush.GetSurface(e.BrushWidth))
{
brushheight = brushsource.Height;
brushwidth = brushsource.Width;
brushsize = new Size(brushwidth, brushheight);
brushcenteroffset = new Size(brushwidth / 2, brushheight / 2);
spacing = GetSpacing(brushsize, e.Quality);
int brusharea = brushwidth * brushheight;
brush = new float[brusharea * 4];
Point srcpt = Point.Subtract(e.Location, new Size(brushwidth / 2, brushheight / 2));
strengthmask = new float[brusharea];
float strength = (float)(Math.Pow(e.Strength, .25) / 255.0);
fixed(float *_strmask = strengthmask)
{
float *strmask = _strmask;
ColorBgra *voidstar = (ColorBgra *)brushsource.Scan0.VoidStar;
for (int i = 0; i < brushsource.Scan0.Length; i += 4)
{
*strmask = voidstar->A * strength;
++voidstar;
++strmask;
}
}
//fill the brush buffer by copying the surface where we clicked into the buffer
fixed(float *brshptrpin = brush)
{
float *brshptr = brshptrpin;
ColorBgra *ptr0 = (ColorBgra *)Surface.Scan0.VoidStar;
for (int y = 0; y < brushheight; ++y)
{
int srcy = Clamp(srcpt.Y + y, 0, srfcHeight - 1);
ColorBgra *ptrrow = ptr0 + srfcWidth * srcy;
for (int x = 0; x < brushwidth; ++x)
{
int srcx = Clamp(srcpt.X + x, 0, srfcWidth - 1);
ColorBgra *ptr = ptrrow + srcx;
brshptr[B] = ptr->B;
brshptr[G] = ptr->G;
brshptr[R] = ptr->R;
brshptr[A] = ptr->A;
brshptr += 4;
}
}
}
}
}
}