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persistable sclass ScanlineBitMatrix extends AbstractMatrix is BitMatrix { int bx1 = Int.MAX_VALUE, by1, bx2, by2; // bounding box of positive bits // format for each line: start x, end x (excl.), start x, end x, ... new IntBuffer scanlineData; // pointer into scanlineData for each line new IntBuffer scanlineStarts; *(BitMatrix m) { super(m.getWidth(), m.getHeight()); // find upper and lower bounding line while (by1 < h && bitMatrixRowEmpty(m, by1)) by1++; by2 = h; while (by2 > by1 && bitMatrixRowEmpty(m, by2-1)) by2--; int ptr = 0; lineLoop: for (int y = by1; y < by2; y++) { scanlineStarts.add(l(scanlineData)); for (int x = 0; x < w; ) { while (!m.get(x, y)) if (++x >= w) continue lineLoop; int x2 = x+1; while (x2 < w && m.get(x2+1, y)) ++x2; scanlineData.add(x); scanlineData.add(x2); if (x < bx1) bx1 = x; if (x2 > bx2) bx2 = x2; x = x2; } } } public Bool get(int x, int y) { if (x < bx1 || y < by1 || x >= bx2 || y >= by2) false; int ptr = scanlineStarts.get(y-by1); int end = y == by2-1 ? scanlineData.size() : scanlineStarts.get(y-by1+1); // linear search for now while (ptr < end) { int x1 = scanlineData.get(ptr++); if (x < x1) false; int x2 = scanlineData.get(ptr++); if (x < x2) true; } false; } public void set(int x, int y, Bool a) { unimplemented(); } Rect boundingBoxOfTrueBits() { ret bx1 >= bx2 ? null : rect(bx1, by1, bx2, by2); } }