SkPoint SkBoundaryPatch::eval(SkScalar unitU, SkScalar unitV) {
SkBoundary* b = fBoundary;
SkPoint u = SkPointInterp(b->eval(SkBoundary::kLeft, SK_Scalar1 - unitV),
b->eval(SkBoundary::kRight, unitV),
unitU);
SkPoint v = SkPointInterp(b->eval(SkBoundary::kTop, unitU),
b->eval(SkBoundary::kBottom, SK_Scalar1 - unitU),
unitV);
return SkMakePoint(SkScalarAve(u.fX, v.fX),
SkScalarAve(u.fY, v.fY));
}
static void set_cubic(SkPoint pts[4], SkScalar x0, SkScalar y0,
SkScalar x3, SkScalar y3, SkScalar scale = 1) {
SkPoint tmp, tmp2;
pts[0].set(x0, y0);
pts[3].set(x3, y3);
tmp = SkPointInterp(pts[0], pts[3], SK_Scalar1/3);
tmp2 = pts[0] - tmp;
tmp2.rotateCW();
tmp2.scale(scale);
pts[1] = tmp + tmp2;
tmp = SkPointInterp(pts[0], pts[3], 2*SK_Scalar1/3);
tmp2 = pts[3] - tmp;
tmp2.rotateCW();
tmp2.scale(scale);
pts[2] = tmp + tmp2;
}
SkPoint SkLineBoundary::eval(Edge e, SkScalar t) {
SkASSERT((unsigned)e < 4);
return SkPointInterp(fPts[e], fPts[(e + 1) & 3], t);
}
