Example usage for com.google.gwt.typedarrays.shared Uint8Array get

Introduction

In this page you can find the example usage for com.google.gwt.typedarrays.shared Uint8Array get.

Prototype

short get(int index);

Source Link

Document

Retrieve one element of this view.

Usage

From source file:com.badlogic.gdx.backends.gwt.GwtGL20.java

License:Apache License

@Override
public void glReadPixels(int x, int y, int width, int height, int format, int type, Buffer pixels) {
    // verify request
    if ((format != WebGLRenderingContext.RGBA) || (type != WebGLRenderingContext.UNSIGNED_BYTE)) {
        throw new GdxRuntimeException(
                "Only format RGBA and type UNSIGNED_BYTE are currently supported for glReadPixels(...).");
    }/*from   w  ww . j  a  v a2s.co m*/
    if (!(pixels instanceof ByteBuffer)) {
        throw new GdxRuntimeException(
                "Inputed pixels buffer needs to be of type ByteBuffer for glReadPixels(...).");
    }

    // create new ArrayBufferView (4 bytes per pixel)
    int size = 4 * width * height;
    Uint8Array buffer = Uint8ArrayNative.create(size);

    // read bytes to ArrayBufferView
    gl.readPixels(x, y, width, height, format, type, buffer);

    // copy ArrayBufferView to our pixels array
    ByteBuffer pixelsByte = (ByteBuffer) pixels;
    for (int i = 0; i < size; i++) {
        pixelsByte.put((byte) (buffer.get(i) & 0x000000ff));
    }
}

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

License:Open Source License

@Override
public GPixmap getPixmap(int subsample, GRect rect, GPixmap retval) {
    if (ymap == null) {
        return null;
    }// www. j  a  v a 2  s .c  o m

    if (retval == null) {
        retval = new GPixmap();
    }

    final int w = rect.width();
    final int h = rect.height();
    final int pixsep = 4;
    final int rowsep = w * pixsep;
    final Uint8Array bytes = retval.init(h, w, null).data;

    ymap.image(subsample, rect, 0, bytes, rowsep, pixsep, false);

    if ((crmap != null) && (cbmap != null) && (crcb_delay >= 0)) {
        cbmap.image(subsample, rect, 1, bytes, rowsep, pixsep, crcb_half);
        crmap.image(subsample, rect, 2, bytes, rowsep, pixsep, crcb_half);
    }

    final GPixelReference pixel = retval.createGPixelReference(0);

    for (int i = 0; i < h;) {
        pixel.setOffset(i++, 0);

        if ((crmap != null) && (cbmap != null) && (crcb_delay >= 0)) {
            pixel.YCC_to_RGB(w);
        } else {
            for (int x = w; x-- > 0; pixel.incOffset()) {
                pixel.setGray(127 - bytes.get(pixel.getOffset()));
            }
        }
    }

    return retval;
}

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From source file:org.parallax3d.parallax.platforms.gwt.GwtGL20.java

License:Open Source License

@Override
public void glReadPixels(int x, int y, int width, int height, int format, int type, Buffer pixels) {
    // verify request
    if ((format != WebGLRenderingContext.RGBA) || (type != WebGLRenderingContext.UNSIGNED_BYTE)) {
        throw new ParallaxRuntimeException(
                "Only format RGBA and type UNSIGNED_BYTE are currently supported for glReadPixels(...).");
    }/*from   w  ww. j  a  v a  2s . com*/
    if (!(pixels instanceof ByteBuffer)) {
        throw new ParallaxRuntimeException(
                "Inputed pixels buffer needs to be of type ByteBuffer for glReadPixels(...).");
    }

    // create new ArrayBufferView (4 bytes per pixel)
    int size = 4 * width * height;
    Uint8Array buffer = Uint8ArrayNative.create(size);

    // read bytes to ArrayBufferView
    gl.readPixels(x, y, width, height, format, type, buffer);

    // copy ArrayBufferView to our pixels array
    ByteBuffer pixelsByte = (ByteBuffer) pixels;
    for (int i = 0; i < size; i++) {
        pixelsByte.put((byte) (buffer.get(i) & 0x000000ff));
    }
}

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