Example usage for com.google.gwt.corp.gfx.client.canvas CanvasRenderingContext2D putImageData

Introduction

In this page you can find the example usage for com.google.gwt.corp.gfx.client.canvas CanvasRenderingContext2D putImageData.

Prototype

public final native void putImageData(ImageData imagedata, float x, float y) ;

Source Link

Document

Write the given image data to the given screen position.

Usage

From source file:jake2.gwt.client.GwtWebGLRenderer.java

License:Open Source License

@Override
protected void GL_ResampleTexture(int[] in, int inwidth, int inheight, int[] out, int outwidth, int outheight) {

    if (canvas1.getWidth() < inwidth) {
        canvas1.setWidth(inwidth);/*from w w w  .j ava 2 s.  c  o m*/
    }
    if (canvas1.getHeight() < inheight) {
        canvas1.setHeight(inheight);
    }

    CanvasRenderingContext2D inCtx = canvas1.getContext2D();
    ImageData data = inCtx.createImageData(inwidth, inheight);
    CanvasPixelArray pixels = data.getData();

    int len = inwidth * inheight;
    int p = 0;

    for (int i = 0; i < len; i++) {
        int abgr = in[i];
        pixels.set(p, (abgr & 255));
        pixels.set(p + 1, (abgr >> 8) & 255);
        pixels.set(p + 2, (abgr >> 16) & 255);
        pixels.set(p + 3, (abgr >> 24) & 255);
        p += 4;
    }
    inCtx.putImageData(data, 0, 0);

    if (canvas2.getWidth() < outwidth) {
        canvas2.setWidth(outwidth);
    }
    if (canvas2.getHeight() < outheight) {
        canvas2.setHeight(outheight);
    }

    CanvasRenderingContext2D outCtx = canvas2.getContext2D();
    outCtx.drawImage(canvas1, 0, 0, inwidth, inheight, 0, 0, outwidth, outheight);

    data = outCtx.getImageData(0, 0, outwidth, outheight);
    pixels = data.getData();

    len = outwidth * outheight;
    p = 0;

    for (int i = 0; i < len; i++) {
        int r = pixels.get(p) & 255;
        int g = pixels.get(p + 1) & 255;
        int b = pixels.get(p + 2) & 255;
        int a = pixels.get(p + 3) & 255;
        p += 4;
        out[i] = (a << 24) | (b << 16) | (g << 8) | r;
    }
}

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