bool lineClipCohStuth(Point winMin, Point winMax, Point &p1, Point &p2)
{
unsigned char code1, code2;
int done = false, plotLine = false;
float m;
while (!done)
{
code1 = encode(p1, winMin, winMax);
code2 = encode(p2, winMin, winMax);
if (accept(code1, code2))
{
done = true;
plotLine = true;
}
else if (reject(code1, code2))
done = true;
else
{
if (inside(code1))
{
swapPts(&p1, &p2);
swapCodes(&code1, &code2);
}
if (p2.x != p1.x)
m = (p2.y - p1.y) / (p2.x - p1.x);
if (code1 & winLeftBitCode)
{
p1.y += (winMin.x - p1.x) * m;
p1.x = winMin.x;
}
else if (code1 & winRightBitCode)
{
p1.y += (winMax.x - p1.x) * m;
p1.x = winMax.x;
}
else if (code1 & winBottomBitCode)
{
if(p2.x != p1.x)
p1.x += (winMin.y - p1.y) * m;
p1.y = winMin.y;
}
else if (code1 & winTopBitCode)
{
if (p2.x != p1.x)
p1.x += (winMax.y - p1.y) * m;
p1.y = winMax.y;
}
}
}
return plotLine;
}
int SkIntersections::intersect(const SkDCubic& c) {
// check to see if x or y end points are the extrema. Are other quick rejects possible?
if (c.endsAreExtremaInXOrY()) {
return false;
}
(void) intersect(c, c);
if (used() > 0) {
SkASSERT(used() == 1);
if (fT[0][0] > fT[1][0]) {
swapPts();
}
}
return used();
}
