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persistable sclass ScanlineBitMatrix extends AbstractMatrix is BitMatrix { int bx1 = -1, 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 matrix) { super(matrix.getWidth(), matrix.getHeight()); int ptr = 0; for y to h: { scanlineStarts.add(ptr)); } } public Bool get(int x, int y) { if (x < bx1 || y < by1 || x >= bx2 || x >= by2) false; int ptr = scanlineStarts.get(y-by1); int end = y == by2-1 ? scanlineData.size() : scanlineStarts.get(y-by1+1); x -= bx1; // 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 < 0 ? null : rect(bx1, by1, bx2, by2); } }