Path.convertConicToQuads() incorrectly implemented

[romainguy]

Path.convertConicToQuads() invokes SkPath::ConvertConicToQuads via _nConvertConicToQuads() but misuses the return value. Here is the current implementation:

        fun convertConicToQuads(p0: Point, p1: Point, p2: Point, w: Float, pow2: Int): Array<Point> {
            Stats.onNativeCall()
            val maxResultPointCount = (1 + 2 * (1 shl pow2)) // See Skia docs
            var pointCount = 0
            val coords = withResult(FloatArray(maxResultPointCount * 2)) {
                pointCount = _nConvertConicToQuads(p0.x, p0.y, p1.x, p1.y, p2.x, p2.y, w, pow2, it)
            }
            return Array(pointCount) { Point(coords[2 * it], coords[2 * it + 1]) }
        }

The value returned by _nConvertConicToQuads is used as a number of points when it's actually a number of quadratic curves. Since each curve is made of 3 points (although in the array the curves all overlap by 1 point), the returned array is missing most of the data, and provides invalid results (returning for instance 2 points when at least 3 are required to build a single quadratic curve).