Example usage for com.google.gwt.canvas.dom.client CanvasPixelArray getLength

Introduction

In this page you can find the example usage for com.google.gwt.canvas.dom.client CanvasPixelArray getLength.

Prototype

public final native int getLength() ;

Source Link

Document

Returns the length of the array.

Usage

From source file:com.googlecode.mgwt.image.client.ImageConverter.java

License:Apache License

public void convert(final ImageResource resource, String color,
        final ImageConverterCallback imageConverterCallback) {

    if (color == null) {
        throw new IllegalArgumentException();
    }//w  w  w. j a v  a  2  s.  co  m

    if (!color.startsWith("#")) {
        throw new IllegalArgumentException();
    }

    color = maybeExpandColor(color);

    final int hexColor = Integer.parseInt(color.substring(1), 16);

    final int red = hexColor >> 16 & 0xFF;
    final int green = hexColor >> 8 & 0xFF;
    final int blue = hexColor & 0xFF;

    final int height = resource.getHeight();
    final int width = resource.getWidth();

    loadImage(resource.getSafeUri().asString(), width, height, new LoadImageCallback() {

        @Override
        public void onSuccess(ImageElement imageElement) {

            Canvas canvas = Canvas.createIfSupported();
            canvas.getElement().setPropertyInt("height", height);
            canvas.getElement().setPropertyInt("width", width);

            Context2d context = canvas.getContext2d();
            context.drawImage(imageElement, 0, 0);
            ImageData imageData = context.getImageData(0, 0, width, height);

            CanvasPixelArray canvasPixelArray = imageData.getData();

            for (int i = 0; i < canvasPixelArray.getLength(); i += 4) {
                canvasPixelArray.set(i, red);
                canvasPixelArray.set(i + 1, green);
                canvasPixelArray.set(i + 2, blue);
                canvasPixelArray.set(i + 3, canvasPixelArray.get(i + 3));
            }
            context.putImageData(imageData, 0, 0);
            imageConverterCallback.onSuccess(new ConvertedImageResource(canvas.toDataUrl("image/png"),
                    resource.getWidth(), resource.getHeight()));
        }
    });
}

---

From source file:com.willshex.palette.client.CanvasBitmap.java

License:Apache License

@Override
public void getPixels(int[] pixels, int offset, int stride, int x, int y, int width, int height) {
    CanvasPixelArray array = canvas.getContext2d().getImageData(0, 0, width, height).getData();
    // copy it to an array
    int dataLength = array.getLength();
    for (int i = 0; i < dataLength; i++) {
        if (i % 4 == 0) {
            pixels[i / 4] = Color.argb(array.get(i + 3), array.get(i), array.get(i + 1), array.get(i + 2));
        }/*  w w  w  . j a  v  a2  s  .co  m*/
    }
}

---

From source file:org.catrobat.html5player.client.Scene.java

License:Open Source License

/**
 *
 * @param imageElement//from w  ww. j a va 2s  .  com
 * @param brightness
 * @return Canvas canvas with the adjusted image
 */
private Canvas adjustImageBrightness(ImageElement imageElement, double brightness) {

    int width = imageElement.getWidth();
    int height = imageElement.getHeight();

    Canvas temp = Canvas.createIfSupported();
    temp.setCoordinateSpaceWidth(width);
    temp.setCoordinateSpaceHeight(height);

    Context2d context = temp.getContext2d();

    context.drawImage(imageElement, 0, 0);

    ImageData imageData = context.getImageData(0, 0, width, height);

    CanvasPixelArray pixelsData = imageData.getData();

    int index = 0;

    System.out.println(pixelsData.getLength());

    int brightnessAdj = (int) (255d * brightness) - 255;

    if (brightnessAdj != 0) {
        while (index < pixelsData.getLength()) {
            if ((index + 1) % 4 != 0) {
                int r = checkColorRange(pixelsData.get(index) + brightnessAdj); //red channel
                pixelsData.set(index, r);

                int g = checkColorRange(pixelsData.get(++index) + brightnessAdj); //green channel
                pixelsData.set(index, g);

                int b = checkColorRange(pixelsData.get(++index) + brightnessAdj); //blue channel
                pixelsData.set(index, b);

                index++; //alpha channel
            }
            index++;
        }
    }

    context.putImageData(imageData, 0, 0);

    return temp;
}

---