import com.google.gwt.canvas.dom.client.CanvasPixelArray; //导入依赖的package包/类
public static Canvas createCanvas(int [] pixels, int width, int height) {
	
	Canvas canvas = Canvas.createIfSupported();
	
	if(canvas == null) return null;
	
	canvas.setCoordinateSpaceWidth(width);
	canvas.setCoordinateSpaceHeight(height);
	
	Context2d context = canvas.getContext2d();
	ImageData data = context.createImageData(width, height);

	CanvasPixelArray array = data.getData();
	for(int i=0; i<width*height; i++) { // ABGR
		array.set(4*i+0, pixels[i] & 0xFF);
		array.set(4*i+1, (pixels[i] >> 8) & 0xFF);
		array.set(4*i+2, (pixels[i] >> 16) & 0xFF);
		array.set(4*i+3, (pixels[i] >> 24) & 0xFF);
	}
	context.putImageData(data, 0, 0);
	
	return canvas;
	
}
 

import com.google.gwt.canvas.dom.client.CanvasPixelArray; //导入依赖的package包/类
Canvas createImageCanvas(int [] pixels, int width, int height) {

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

	    Context2d context = canvas.getContext2d();
	    ImageData data = context.createImageData(width, height);

	    CanvasPixelArray array = data.getData();
	    for(int i=0; i<width*height; i++) {
	        array.set(4*i+0, pixels[i] & 0xFF);
	        array.set(4*i+1, (pixels[i] >> 8) & 0xFF);
	        array.set(4*i+2, (pixels[i] >> 16) & 0xFF);
	        array.set(4*i+3, (pixels[i] >> 24) & 0xFF);
	    }
	    context.putImageData(data, 0, 0);

	    return canvas;

	}
 

import com.google.gwt.canvas.dom.client.CanvasPixelArray; //导入依赖的package包/类
private Canvas createImageCanvas(int [] pixels, int width, int height) {
	
	Canvas canvas = Canvas.createIfSupported();
	canvas.setCoordinateSpaceWidth(width);
	canvas.setCoordinateSpaceHeight(height);
	
	Context2d context = canvas.getContext2d();
	ImageData data = context.createImageData(width, height);

	CanvasPixelArray array = data.getData();
	for(int i=0; i<width*height; i++) { // ABGR
		array.set(4*i+0, pixels[i] & 0xFF);
		array.set(4*i+1, (pixels[i] >> 8) & 0xFF);
		array.set(4*i+2, (pixels[i] >> 16) & 0xFF);
		array.set(4*i+3, (pixels[i] >> 24) & 0xFF);
	}
	context.putImageData(data, 0, 0);
	
	canvas.getElement().getStyle().setMargin(4, Unit.PX);
	
	return canvas;
	
}
 

import com.google.gwt.canvas.dom.client.CanvasPixelArray; //导入依赖的package包/类
@Override public void setRgb(int startX, int startY, int width, int height,
                             int[] rgbArray, int offset, int scanSize) {
  Context2d ctx = canvas.getContext2d();
  ImageData imageData = ctx.createImageData(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 argb = rgbArray[dst + x];
      pixelData.set(i++, (argb >> 16) & 255);
      pixelData.set(i++, (argb >> 8) & 255);
      pixelData.set(i++, (argb) & 255);
      pixelData.set(i++, (argb >> 24) & 255);
    }
    dst += scanSize;
  }
  ctx.putImageData(imageData, startX, startY);
}
 

import com.google.gwt.canvas.dom.client.CanvasPixelArray; //导入依赖的package包/类
@Before
public void before() {
    Context2d context2d = mock(Context2d.class);
    imageData = mock(ImageData.class);
    pixelArray = mock(CanvasPixelArray.class);
    doReturn(PIXEL_VALUE).when(pixelArray)
            .get(anyInt());
    doReturn(pixelArray).when(imageData)
            .getData();
    doReturn(imageData).when(context2d)
            .getImageData(anyInt(), anyInt(), anyInt(), anyInt());
    instance = new CanvasImageData(context2d, WIDTH, HEIGHT);
}