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static Matrix rgbaWithSizeToIntMatrix(L data) { if (l(data) < 2) null; int _w = data.get(0); int _h = data.get(1); if (l(data)-2 < _w*_h) null; class RGAWithSizeMatrix extends AbstractMatrix { *() { super(_w, _h); } int xyToIndex(int x, int y) { ret 2+y*w+x; } public Int get(int x, int y) { ret data.get(xyToIndex(x, y)); } public void set(int x, int y, Int a) { data.set(xyToIndex(x, y), a); } }; ret new RGAWithSizeMatrix; }