Example usage for com.google.gwt.corp.gfx.client.canvas ImageData getData

Introduction

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

Prototype

public native final CanvasPixelArray getData() ;

Source Link

Document

Returns a canvas pixel array of the size width * height * 4.

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 ww w .  ja v  a  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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From source file:jake2.gwt.client.GwtWebGLRenderer.java

License:Open Source License

public void setPicDataLowLevel(image_t image, ImageElement img) {
    CanvasElement canvas = (CanvasElement) Document.get().createElement("canvas");
    int w = img.getWidth();
    int h = img.getHeight();
    canvas.setWidth(w);//from  w ww  .  j  ava2 s.c o m
    canvas.setHeight(h);
    //      canvas.getStyle().setProperty("border", "solid 1px green");
    canvas.getStyle().setDisplay(Display.NONE);
    Document.get().getBody().appendChild(canvas);
    CanvasRenderingContext2D ctx = canvas.getContext2D();
    ctx.drawImage(img, 0, 0);
    ImageData data = ctx.getImageData(0, 0, w, h);
    CanvasPixelArray pixels = data.getData();

    int count = w * h * 4;
    byte[] pic = new byte[count];
    for (int i = 0; i < count; i += 4) {
        pic[i + 3] = (byte) pixels.get(i + 3); // alpha, then bgr
        pic[i + 2] = (byte) pixels.get(i + 2);
        pic[i + 1] = (byte) pixels.get(i + 1);
        pic[i] = (byte) pixels.get(i);
    }

    GL_SetPicData(image, pic, w, h, 32);
}

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

License:Open Source License

protected void debugLightmap(IntBuffer lightmapBuffer, int w, int h, float scale) {
    CanvasElement canvas = (CanvasElement) Document.get().createElement("canvas");
    canvas.setWidth(w);/*  w ww .j av  a 2s. com*/
    canvas.setHeight(h);
    Document.get().getBody().appendChild(canvas);
    ImageData id = canvas.getContext2D().createImageData(w, h);
    CanvasPixelArray pd = id.getData();
    for (int i = 0; i < w * h; i++) {
        int abgr = lightmapBuffer.get(i);
        pd.set(i * 4, abgr & 255);
        pd.set(i * 4 + 1, abgr & 255);
        pd.set(i * 4 + 2, abgr & 255);
        pd.set(i * 4 + 3, abgr & 255);
    }
    canvas.getContext2D().putImageData(id, 0, 0);
}

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