I use something like the following function. It really depends what
you mean by "merge". Do you mean average, alpha over, multiply, add,
etc.?
Anyway, you can change the arithmetic here to suit your needs. The
important parts are that you copy the bitmap you wish to change so
that you have a mutable/changeable bitmap, and that you call
setPixel() to change the bitmap pixels to their new color.
In this example, I'm looping over all the pixels and assuming both
bitmaps are the same size.
You can also do this with a canvas, but this approach is the most
flexible. It is not terribly fast. I only use it at the startup of my
program. But unless you are calling it repeatedly, it shouldn't slow
you down too much.
private static Bitmap applyMask(Bitmap tileBitmap, Bitmap maskBitmap)
{
Bitmap workingBitmap = tileBitmap.copy(bitmapConfig, true); //
IMPORTANT
int width = tileBitmap.getWidth();
int height = tileBitmap.getHeight();
for(int x=0; x<width; x++){
for(int y=0; y<height; y++){
int maskPixel = maskBitmap.getPixel(x, y);
int tilePixel = tileBitmap.getPixel(x, y);
//change this line for different color
mixing types
int newPixel = Color.argb( Color.red(maskPixel),
Color.red(tilePixel), Color.green(tilePixel), Color.blue(tilePixel));
workingBitmap.setPixel(x, y, newPixel);
//IMPORTANT
}
}
return workingBitmap;
}
On Mar 16, 1:08 am, NapoleonLiu <liuwa...@neusoft.com> wrote:
> I am a new one in UI coding. So may be my way is not the best..
>
> Panit mPaint = new Paint();
> mPaint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
> mPaint.setAlpha(XX);
> notice that Mode.DST_IN is important(Better to see it's api-doc.)
> Use this paint to draw a "ALPHA_8" bitmap on your org bitmap ,then you can
> get a Bitmap which have special alpha.
> So you can get two special alpha bitmap ,then draw them with Mode.DST_IN.
> I think you will get you want.
> But there must be a nice way, to do a calculation on the alpha area of
> bitmap.
> hope it can help you.
>
> On Tue, 16 Mar 2010 13:20:01 +0800, BobG <bobgard...@aol.com> wrote:
> > How about set the Alpha channel in each one to 50% so they are both
> > half see through?
>
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