uint32_t GrPathUtils::generateCubicPoints(const SkPoint& p0,
const SkPoint& p1,
const SkPoint& p2,
const SkPoint& p3,
SkScalar tolSqd,
SkPoint** points,
uint32_t pointsLeft) {
if (pointsLeft < 2 ||
(p1.distanceToLineSegmentBetweenSqd(p0, p3) < tolSqd &&
p2.distanceToLineSegmentBetweenSqd(p0, p3) < tolSqd)) {
(*points)[0] = p3;
*points += 1;
return 1;
}
SkPoint q[] = {
{ SkScalarAve(p0.fX, p1.fX), SkScalarAve(p0.fY, p1.fY) },
{ SkScalarAve(p1.fX, p2.fX), SkScalarAve(p1.fY, p2.fY) },
{ SkScalarAve(p2.fX, p3.fX), SkScalarAve(p2.fY, p3.fY) }
};
SkPoint r[] = {
{ SkScalarAve(q[0].fX, q[1].fX), SkScalarAve(q[0].fY, q[1].fY) },
{ SkScalarAve(q[1].fX, q[2].fX), SkScalarAve(q[1].fY, q[2].fY) }
};
SkPoint s = { SkScalarAve(r[0].fX, r[1].fX), SkScalarAve(r[0].fY, r[1].fY) };
pointsLeft >>= 1;
uint32_t a = generateCubicPoints(p0, q[0], r[0], s, tolSqd, points, pointsLeft);
uint32_t b = generateCubicPoints(s, r[1], q[2], p3, tolSqd, points, pointsLeft);
return a + b;
}
uint32_t GrPathUtils::generateQuadraticPoints(const SkPoint& p0,
const SkPoint& p1,
const SkPoint& p2,
SkScalar tolSqd,
SkPoint** points,
uint32_t pointsLeft) {
if (pointsLeft < 2 ||
(p1.distanceToLineSegmentBetweenSqd(p0, p2)) < tolSqd) {
(*points)[0] = p2;
*points += 1;
return 1;
}
SkPoint q[] = {
{ SkScalarAve(p0.fX, p1.fX), SkScalarAve(p0.fY, p1.fY) },
{ SkScalarAve(p1.fX, p2.fX), SkScalarAve(p1.fY, p2.fY) },
};
SkPoint r = { SkScalarAve(q[0].fX, q[1].fX), SkScalarAve(q[0].fY, q[1].fY) };
pointsLeft >>= 1;
uint32_t a = generateQuadraticPoints(p0, q[0], r, tolSqd, points, pointsLeft);
uint32_t b = generateQuadraticPoints(r, q[1], p2, tolSqd, points, pointsLeft);
return a + b;
}
