Example usage for com.google.gwt.canvas.dom.client Context2d getImageData

Introduction

In this page you can find the example usage for com.google.gwt.canvas.dom.client Context2d getImageData.

Prototype

public final native ImageData getImageData(double sx, double sy, double sw, double sh) ;

Source Link

Document

Returns an image data object for the screen area denoted by sx, sy, sw and sh.

Usage

From source file:playn.html.HtmlCanvasImage.java

License:Apache License

@Override
public void setRgb(int startX, int startY, int width, int height, int[] rgbArray, int offset, int scanSize) {
    Context2d ctx = canvas.canvas().getContext2d();
    ImageData imageData = ctx.getImageData(startX, startY, width, height);
    CanvasPixelArray pixelData = imageData.getData();
    int i = 0;//from ww  w.  ja  va2s .com
    int dst = offset;
    for (int y = 0; y < height; y++) {
        for (int x = 0; x < width; x++) {
            int rgba = rgbArray[dst + x];
            pixelData.set(i++, (rgba >> 16) & 255);
            pixelData.set(i++, (rgba >> 8) & 255);
            pixelData.set(i++, (rgba) & 255);
            pixelData.set(i++, (rgba >> 24) & 255);
        }
        dst += scanSize;
    }
}

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From source file:playn.html.HtmlImage.java

License:Apache License

@Override
public void getRgb(int startX, int startY, int width, int height, int[] rgbArray, int offset, int scanSize) {
    Asserts.checkState(isReady(), "Cannot getRgb() a non-ready image");

    if (canvas == null) {
        canvas = img.getOwnerDocument().createCanvasElement();
        canvas.setHeight(img.getHeight());
        canvas.setWidth(img.getWidth());
        canvas.getContext2d().drawImage(img, 0, 0);
        // img.getOwnerDocument().getBody().appendChild(canvas);
    }/*  w  w w  .j av  a 2 s  .  c om*/

    Context2d ctx = canvas.getContext2d();
    ImageData imageData = ctx.getImageData(startX, startY, width, height);
    CanvasPixelArray pixelData = imageData.getData();
    int i = 0;
    int dst = offset;
    for (int y = 0; y < height; y++) {
        for (int x = 0; x < width; x++) {
            int r = pixelData.get(i++);
            int g = pixelData.get(i++);
            int b = pixelData.get(i++);
            int a = pixelData.get(i++);
            rgbArray[dst + x] = a << 24 | r << 16 | g << 8 | b;
        }
        dst += scanSize;
    }
}

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From source file:thothbot.parallax.core.client.renderers.RaytracingRenderer.java

License:Open Source License

public RaytracingRenderer(int width, int height) {
    canvas = Canvas.createIfSupported();
    canvas.ensureDebugId("canvas2d");

    setSize(width, height);//  ww  w.  j  ava 2  s .  c o  m

    context = canvas.getContext2d();
    context.setFillStyle("#FFFFFF");

    canvasBlock = Canvas.createIfSupported();
    canvasBlock.setCoordinateSpaceWidth(blockSize);
    canvasBlock.setCoordinateSpaceHeight(blockSize);

    RootPanel.get().add(canvasBlock, -10000, 0);

    Context2d contextBlock = canvasBlock.getContext2d();
    imagedata = contextBlock.getImageData(0, 0, blockSize, blockSize);
}

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