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scope regionBorder_innerPoints. static Pt[] #directions = { pt(1, 0), pt(0, 1), pt(-1, 0), pt(0, -1) // r, d, l, u }; static L regionBorder_innerPoints(BWImage_FastRegions regions, int iRegion) { new PtBuffer out; int w = regions.w; var it = regions.regionIterator(iRegion); new BitSet seen; while (it.next()) { int x = it.x(), y = it.y(); // is it a border pixel? if (regions.inRegion(x, y-1, iRegion) && regions.inRegion(x-1, y, iRegion) && regions.inRegion(x+1, y, iRegion) && regions.inRegion(x, y+1, iRegion)) continue; int dir = 3; // start with direction up (any direction should do) loop: while (true) { int pos = y*w+x; if (seen.get(pos)) break; seen.set(pos); out.add(x, y); for (int turn = 3; turn <= 6; turn++) { // try left, straight, right, back int newDir = (dir+turn) & 3; Pt d = directions[newDir]; int x2 = x+d.x, y2 = y+d.y; if (regions.inRegion(x2, y2, iRegion)) { x = x2; y = y2; dir = newDir; continue loop; } } // if we get here, the region is just 1 pixel (so we're done) break; } } ret out; }