Example usage for com.google.gwt.typedarrays.shared Int16Array subarray

Introduction

In this page you can find the example usage for com.google.gwt.typedarrays.shared Int16Array subarray.

Prototype

Int16Array subarray(int begin, int end);

Source Link

Document

Create a new view from the same array, from offset to (but not including) end in this view.

Usage

From source file:com.lizardtech.djvu.IWMap.java

License:Open Source License

/**
 * DOCUMENT ME!/* w ww. ja  v  a 2s .  c  o m*/
 *
 * @param index DOCUMENT ME!
 * @param img8 DOCUMENT ME!
 * @param rowsize DOCUMENT ME!
 * @param pixsep DOCUMENT ME!
 * @param fast DOCUMENT ME!
 */
void image(int index, final Uint8Array img8, int rowsize, int pixsep, boolean fast) {
    final Int16Array data16 = TypedArrays.createInt16Array(bw * bh);
    final Int16Array liftblock = TypedArrays.createInt16Array(1024);
    int pidx = 0;
    IWBlock[] block = blocks;
    int blockidx = 0;
    int ppidx = 0;

    for (int i = 0; i < bh; i += 32, pidx += (32 * bw)) {
        for (int j = 0; j < bw; j += 32) {
            block[blockidx].write_liftblock(liftblock, 0, 64);
            blockidx++;

            ppidx = pidx + j;

            for (int ii = 0, p1idx = 0; ii++ < 32; p1idx += 32, ppidx += bw) {
                Int16Array src = liftblock.subarray(p1idx, p1idx + 32);
                data16.set(src, ppidx);
            }
        }
    }

    if (fast) {
        backward(data16, 0, iw, ih, bw, 32, 2);
        pidx = 0;

        for (int i = 0; i < bh; i += 2, pidx += bw) {
            for (int jj = 0; jj < bw; jj += 2, pidx += 2) {
                short s = data16.get(pidx);
                data16.set(pidx + bw, s);
                data16.set(pidx + bw + 1, s);
                data16.set(pidx + 1, s);
            }
        }
    } else {
        backward(data16, 0, iw, ih, bw, 32, 1);
    }

    pidx = 0;

    for (int i = 0, rowidx = index; i++ < ih; rowidx += rowsize, pidx += bw) {
        for (int j = 0, pixidx = rowidx; j < iw; pixidx += pixsep) {
            int x = (data16.get(pidx + (j++)) + 32) >> 6;

            if (x < -128) {
                x = -128;
            } else if (x > 127) {
                x = 127;
            }

            img8.set(pixidx, x);
        }
    }
}

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