Fast pixel building using SWT?

Question

I am looking for a quick and easy way to build randomly colored pixels in a SWT canvas. So far, I'm using something like this:

// initialization:
GC gc = new GC(canvas);

// inside the drawing loop:
Color cc = new Color(display, r, g, b);
gc.setForeground(cc);
gc.drawPoint(x, y);
cc.dispose();

It is terribly slow. It takes about one and a half seconds to fill the canvas with 300x300 pixels. I could create an image overs, set pixels to it, and then draw an image. It will be faster, but I specifically want the gradual effect of drawing an image pixel by pixel on the canvas.

Answer 1

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Answer 2

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Answer 3

Create a BufferedImage Object:

BufferedImage bi = new new BufferedImage(300, 300, BufferedImage.TYPE_INT_RGB);

inside the drawing loop, set your pixels:

bi.setRGB(x, y, int_rgb);
...

and finally display the buffer image:

g.drawImage(bi, 0, 0, null); 

If you discover setRGB () slowly, you can directly access the bitmap data:

int[] raster = ((DataBufferInt)bi.getRaster().getDataBuffer()).getData();

and later

raster[y * 300 + x] = int_rgb;