Well, no, it just happens that in that case OR gives the same result
as a more useful mode, like PLUS or XOR.
Use PixelXorXfermode.
E.g.
public class XorDemo extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(new View(this) {
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawColor(0xffff0000);
Paint paint = new Paint();
paint.setXfermode(new
PixelXorXfermode(0x000000));
paint.setColor(0xff00ff00);
canvas.drawRoundRect(new RectF(10, 10, 200,
200), 20f, 20f,
paint);
}
});
}
}
On Apr 13, 12:52 am, Kaj Bjurman <[email protected]> wrote:
> It does also make sense for somecolorimages. Take an image that only
> has information in theredchannel, and OR it with an image that only
> has information in e.g. the blue channel and you'll see what I want to
> do.
>
> On 12 Apr, 21:38, Bob Kerns <[email protected]> wrote:
>
>
>
> > And just what useful visual result do you want to happen as a result?
>
> > OR makes sense for black and white, not forcolor.
>
> > Or are you using the graphics processor for something other than
> > actual graphics?
>
> > On Apr 12, 3:30 am, Kaj Bjurman <[email protected]> wrote:
>
> > > Hi,
>
> > > Is it in some way possible to draw something with bitwise OR? I.e. I
> > > want the pixel values to be OR:ed with the pixel values that already
> > > had been drawn.
>
> > > I could invoke get pixel, and use OR, and then set the pixel again,
> > > but that would be too slow.
>
> > > Thanks
> > > K
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